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1
Wahab, Hassan A., M. Y. Noordin, Mohammad Sakhawat Hussain, and S. Izman. "Characteristics of Electroplated Nickel Layer on Tungsten Carbide." Applied Mechanics and Materials 315 (April 2013): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amm.315.73.
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Diamond coating on tungsten carbide (WC-Co) cutting tools with cobalt binder experiences delaminating failure due to the deleterious effect of cobalt. One of the methods used to reduce this effect is by coating an interlayer onto the substrate surface prior to diamond deposition. Different materials have been used as an interlayer which is normally deposited to the substrate surface using CVD and PVD techniques. Among different materials used as interlayer on WC-Co, nickel is considered as an attractive candidate due its good chemical and physical properties. In this study the potential of the electroplating technique for deposition of nickel interlayer on WC-Co will be investigated. Nickel deposition on WC-6%Co substrate was carried out by electroplating in a standard watts solution at constant plating parameters (Current: 0.1 Amp, electric potential: 1.0 V and pH: 3.5). The gap between anode and cathode was varied (5mm, 10mm and 15mm). The nickel coating formed on the hard metal surface was characterized in terms of the coating thickness, layer uniformity and coating hardness by using SEM and the micro hardness tester. Based on the results, desirable nickel coating properties were obtained when the separation distance between anode and cathode was 15mm.
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Ryu, Seong Hyeon, Kyung Il Kim, Wooram Noh, Sang Sub Kim, and Gue Serb Cho. "Effect of Microstructural Parameters on the Tensile Property of WC-12~22wt%Co Cemented Carbide." Korean Journal of Metals and Materials 59, no. 3 (March 5, 2021): 201–8. http://dx.doi.org/10.3365/kjmm.2021.59.3.201.
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Cemented carbide is a kind of composite material in which fine particles of carbide are embedded into the matrix of a binder metal. It has a long service life because of its superior mechanical properties. In this study, the overall tensile behavior of a cemented carbide, WC-Co, was investigated by considering its characteristic microstructure parameters. Tensile strength and strain to fracture were evaluated by measuring the stress-strain curves of a standard tensile specimen. Scanning Electron Microscopy (SEM) was used to analyze both the average size and contiguity of WC carbide particles, as well as the mean free path of the Co (cobalt) binder. Specific correlations between mechanical and microstructural features were examined and elucidated for various volume fractions of the binder metal. The Co content and the mean free path of the Co binder were in a proportional relationship, and tensile strength showed an opposite tendency to Co content. Regarding Young’s modulus and strain, it was confirmed that a large difference appears depending on the crystal structure of the Co phase. Furthermore, by probing topology of the fractured surface of the tensile specimen it was determined that the existence of irregular voids could contribute to the statistical variance in the measured values.
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Karalliyadda, S. M. C. B., and Tsuji Kazunari. "Certified Organic Farming: Awareness of Export Oriented Small-Scale Farmers in Sri Lanka." Journal of Sustainable Development 11, no. 6 (November 29, 2018): 259. http://dx.doi.org/10.5539/jsd.v11n6p259.
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This study aimed at investigating Sri Lankan small-scale Certified organic (CO) farmers’ awareness on their adopted organic standards, the third-party certification body, internal control system, Fairtrade certification, and conditions of contracts with coordinating organizations. A cross sectional survey was conducted among a randomly selected sample of 202 CO farmers who were linked with five coordinating organizations. Primary data was collected using a structured questionnaire along with key informant discussions and field observations. Data were analyzed using descriptive statistics to generate simple summaries and tendencies. According to the results, CO farmers are organized as farmer organizations that were initiated as out-grower groups of coordinating organizations. All CO farmers were unaware of the adopted organic standard. The majority were unaware of the third-party certification body (83%), and the internal control system (81.7%). This perhaps due to their exclusion in managing certification related aspects. Thus, showed submissive decision-making behavior. However, many of them were aware of Fairtrade certification (56.4%) as it provides a wide spectrum of additional benefits covering production, marketing, and farmers’ welfare. Farmers were also aware of their contracts (verbal or written) with coordinating firms (62.2%) but hardly conscious of their conditions. In some contracts, conditions were unfairly distributed among stakeholders. Therefore, the study recommends enhancing small-scale farmers knowledge not only the production aspects but also certification, quality assurance, administration, and marketing as well. Meanwhile, mediating the partnership among stakeholders by a government body is also recommended to avoid power abuses among stakeholders.
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Nnodim, A. U., and P. D. Aleru. "Influence of Non-Formal Education on Entrepreneurship Skill Development Among Rural Farmers in Ikwerre Local Government Area, Rivers State." International Journal of Adult Education and Technology 11, no. 1 (January 2020): 60–70. http://dx.doi.org/10.4018/ijaet.2020010104.
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The purpose of the article was to determine the influence of non-formal education on entrepreneurship skill development among rural farmers in Ikwerre Local Government Area of Rivers State. The study design was descriptive survey. The target population was six hundred and fifty (650) members of the farmers' co-operative societies in the Ikwerre Local Government Area. The sample size was two hundred (200) farmers purposively selected based on the size of farm holdings. Instrument for data collection was a structured questionnaire in a 4-point rating scale of agreement. The instrument was tested using Cronbach Alpha reliability test and was found to be reliable at 0.79. Data collected were analyzed descriptively using mean and standard deviation. The findings showed that community outreach, on-the-job training and co-operative training programmes were veritable tools for rural farmers' entrepreneurship skill development. Hence, the need to situate agricultural entrepreneurship centres in the rural area was recommended.
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Lisiecka, Barbara. "The evaluation of wear of tungsten carbide dental bur." Production Engineering Archives 19, no. 19 (June 1, 2018): 6–9. http://dx.doi.org/10.30657/pea.2018.19.02.
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Abstract Due to its durability, tungsten carbide has long been used as a material to produce dental burs. WC– Co burs are designed for smooth, efficient cutting and extended life. Dental burs are available in different sizes and shapes, for example round burs, pear and cylinder-shaped, egg-shaped, as well as there are various tapered ones, which enable an individual selection of the drill for the right treatment. Carbides can be used for standard crowns and bridges, for extensive surgical procedures and they should minimize damage to the existing teeth. The design of WC–Co dental bur reduces a patient’s discomfort because of the operating time and the fact that its liquidity is preserved. The head of the bur (the cutting edge) delivers optimum concentricity and strength. The shank is made from stainless steel allowing a bur to be autoclaved multiple times without the risk of corrosion. The main purpose of this study was to evaluate the wear of a tungsten carbide dental bur. The results of stereoscopy microscope and SEM/EDS analysis are presented.
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Myalska, H., K. Szymański, and G. Moskal. "Microstructure And Properties Of WC-Co HVAF Coatings Obtained From Standard, Superfine And Modified By Sub-Micrometric Carbide Powders." Archives of Metallurgy and Materials 60, no. 2 (June 1, 2015): 759–66. http://dx.doi.org/10.1515/amm-2015-0203.
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Abstract In this paper, microstructure and some properties of various coatings based on WC-Co obtained by the High Velocity Air Fuel technique are discussed. Initially, two WC-Co 83-17 powders of standard and superfine size were examined as a feedstock for a coatings deposition on a steel substrate. A standard Amperit 526.074 powder and an Inframat superfine powder were applied. Then three different sub-micrometric powders, WC, Cr3C2 and TiC were applied to modify the microstructure of WC-Co (Amperit 526.074). The aim of the investigations was to compare the microstructure and basic properties of coatings deposited from different components. The influence of sub-micrometric additions on mechanical properties of basic coatings was analyzed. Microstructure characterization of powders by using SEM and characterization of their technological properties as well, are presented. For all manufactured coatings obtained by a High Velocity Air Fuel method, the microhardness, porosity, adhesion to a substrate, and fracture toughness were determined. An improvement in WC-Co coating properties, as a result of sub-micrometric carbides addition, was revealed.
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Sosnowy, Pawel, Marek Góral, Slawomir Kotowski, Grzegorz Hanula, Jakub Gwizdała, Jakub Drzał, Marcin Kobylarz, Przemysław Borowski, and Rafał Gargała. "The Influence of Temperature on Erosion Resistance of Carbide Coatings Deposited by APS Method." Solid State Phenomena 227 (January 2015): 251–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.227.251.
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The carbide coatings are widely used for wear and erosion protection of different materials. In present paper the WC/Co coatings were deposited by a single-cathode Sulzer Metco F-4 plasma gun. The microstructure and thickness measurements were conducted. The erosion test was conducted using a Koechler Air Jet Errosion tester at the temperature of up to 500oC. The procedure was similar to ASTM G76 standard. Changes in erosion resistance of coating into different temperature were observed.
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Olayemi, Bakre, and Dorasamy Nirmala. "Creating economic viability in rural South Africa through water resource management in subsistence farming." Environmental Economics 7, no. 4 (December 9, 2016): 68–77. http://dx.doi.org/10.21511/ee.07(4).2016.07.
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The purpose of this paper is to analyze the role water resources management can play in improving subsistence farming in rural South Africa, as well as reducing poverty. The study followed a mixed research approach where attributes of qualitative and quantitative methods were used. This paper indicates that due to water scarcity experienced amongst subsistence farmers in case study area, several farmers have opted out of farming. This has a negative consequence on food security and poverty among many subsistence farmers. The paper suggests the pathways for sustainable subsistence farming aimed at creating an economically viable rural community while addressing poverty through the implementation of an efficient water resources management practice. As highlighted in this paper, development is a gradual process, and water resources management can possibly be the first step in creating an economically viable community while alleviating poverty among subsistence farmers in water scarce rural areas of South Africa. Revamping the subsistence farming, as well as improving the standard of living amongst rural subsistence farmers requires a purposeful co-ordination and exchange of ideas between experienced agricultural extension workers, researchers in the field of context, policy makers, as well as other stakeholders. Such purposeful co-ordination should have an agenda of transforming the subsistence farming to a commercialized form of farming in the long term. The resultant effect will possibly result in an economically viable community; increase in household income, as well as food security, thereby reducing poverty. Keywords: subsistence farming, rural development, water resource management, economic viability, poverty eradication, agricultural extension. JEL Classification: Q12, N5
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Kamran, Muhammad Adeel, and Tahira Shamshad. "Impacts of Hill Torrents’ Management on Socio-Economic Conditions of Arid Land Farmers: a Case Study of Tehsil D.G. Khan." Asian Journal of Humanity, Art and Literature 2, no. 1 (June 30, 2015): 29–36. http://dx.doi.org/10.18034/ajhal.v2i1.292.
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The study conducted in arid areas of Dera Ghazi Khan occasionally affected by hill torrents (Suri-Lund, Vidore, Sakhi-Sarwar, Mithawan) coming from Koh-e-Suleman range. The study found that hill torrent water is used for agriculture, domestic and livestock. The management of this water significantly affects on income, crop yield, soil fertility, health conditions and living standard of farmers. The local cost effective methods to store this water include wah, dubba and bundh but most of water is wasted as they are insufficient. The water distribution mechanism fosters cooperation and helps to form new relations with co-farmers. The study suggested that government and NGOs should help people to construct concrete diversions, bundhs, ponds and dams to manage hill torrent water.
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Chan, Kin Wing (Ray), and Andrew Flynn. "Food Production Standards and the Chinese Local State: Exploring New Patterns of Environmental Governance in the Bamboo Shoot Industry in Lin'an." China Quarterly 235 (June 4, 2018): 849–75. http://dx.doi.org/10.1017/s0305741018000802.
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AbstractAlthough current studies into Chinese food supply and quality provide explanations for the causality of food problems, there is limited inquiry into the role of the county government. This is a serious omission for two main reasons: first, because county governments perform a key role in providing support for farmers through agricultural extension services and farmers’ cooperatives, and second, because county-level administrative divisions are central to developing novel instruments to manage supply chain relationships, such as food production standards. We investigate the key players involved in standard making and delivery at the county level. We also analyse how and why the county government engages in standard-setting activities. We use Lin'an's bamboo shoot production industry as a case study to understand how the local state implements “hazard-free,” “green” and “forest food” production standards. The paper concludes that traditional conceptualizations of the local state do not sufficiently address how nature, knowledge of standards and state authority co-produce institutional capacity to control food supply and quality in China. In practice, the local state engages with non-state actors to achieve superficial environmental efforts, such as developing food production standards to throw a “green cloak” over a productivist model.
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Rosso, Mario, Ildiko Peter, and Federico Gobber. "Focus on Carbide-Tipped Circular Saws when Cutting Stainless Steel and Special Alloys." Advanced Materials Research 1114 (July 2015): 13–21. http://dx.doi.org/10.4028/www.scientific.net/amr.1114.13.
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Circular saw blades are used exclusively for cut-off work, ranging from small manual feed operations, up to very large power fed saws commonly used for sectioning stock as it comes from a rolling mill or other manufacturing processes for long products. The teeth profile, as well as the tooth configuration are of fundamental importance for the blade performances; through a combination of blade rigidity and grinding wheel condition a good quality surface finish is attained for tools of commercial standard. The materials used for the production of circular saw blades are ranging from high speed steel to cemented carbides. In particular, cemented carbides, being characterized by high hardness and strength, are used in applications where materials with high wear resistance and toughness are required. The main constituents of cemented carbides are tungsten carbide and cobalt. Tungsten carbide imparts the alloys the necessary strength and wear resistance, whereas cobalt contributes to the toughness and ductility of the alloys. The WC-Co alloys are tailored for specific applications by the proper choice of tungsten carbide grain size and the cobalt content. The grain size of the tungsten carbide in WC-Co varies from about 40 µm to around 0.3 µm, the cobalt content from 3 to 30 wt%. The coarse grained hardmetals are mainly used in mining applications, the smallest grain size being about 3 µm and the minimum cobalt content 6 wt%. The grain size of tungsten carbide in the metal cutting industry, as well as for universal applications lies in the range of 1-2 µm. However, with the advent of near net shape manufacturing and thin walled components, the use of submicron carbide is growing, since their high compressive strength and abrasive wear resistance can be used to produce tools with a sharp cutting edge and a large positive rake angle.In this invited paper, a general overview on the actual trends in the choice of the best material when cutting special alloys will be presented and discussed. Based on the recent and past literature some examples of their up-to-date application, such as circular saws used to cut stainless steels and some high strength alloys, are talk over.
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Oshunsanya, Suarau Odutola, and Tolafe Olayinka Adeniran. "Water Quality and Crop Contamination in Peri-Urban Agriculture." Agricultura Tropica et Subtropica 47, no. 3 (September 1, 2014): 94–105. http://dx.doi.org/10.2478/ats-2014-0013.
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Abstract The quality of untreated water used by dry season vegetable growers determines the safety of the vegetables produced for human consumption. Traditionally, small scale vegetable farmers site their farms along banks of streams which gradually dry up during the dry season resulting in isolated pockets of ponds at different intervals along the path of the streams which are used by farmers to irrigate. A field experiment was initiated at Ibadan to ascertain the quality of irrigation water used to produce vegetables along Ona-stream during the dry season. Five isolated ponds and one locally dug well were sampled and analysed to ascertain the heavy metals status. Results of soil analysis from five farms (A - E) sited very close to the stream revealed high concentrations of heavy metals ranging from 0.96 to 2.34 mg kg-1 for Pb, 0.72 to 2.16 mg kg-1 for Cr and 0.30 to 0.92 mg kg-1 for Co while farmland F sited about 90m away from the stream was free of Pb, Cr and Co contaminants. Locally dug well F water was free of Cr, Co and Pb while isolated ponds had Cr, Co and Pb in the range of 0.01 to 0.23 mg kg-1 which is beyond safe consumption thresholds. There were strong correlations between heavy metals in water and vegetable for Cr (0.992**), Cd (0.599**), Ni (0.614*) and Pb (0.552**) indicating that the hygienic status of dry season vegetables is largely determined by the quality of irrigation water. In addition, all vegetables irrigated with untreated isolated ponds contained Cd, Pb and Ni concentrations above maximum permissible standard which could pose risk to human health. Therefore, farmers should be enlightened on the need to use hygienic water for irrigation. Construction of shallow wells on the farms instead of using contaminated stream water directly could be a better option for healthy and sustainable agriculture.
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Somer, Jakub, Martin Klíma, Petr Machac, and Ivan Szendiuch. "Joining Low Temperature Co-Fired Ceramics, Al2O3 and SiC Substrates for Higher Operating Temperature Applications." Solid State Phenomena 258 (December 2016): 631–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.631.
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The article deals with forming solid joints of Low Temperature Co-fired Ceramic with Alumina or Silicon Carbide chips. The aim of this study is to find material of standard thick film layer process, which would be useful for electronic chip packages designed for higher operating temperatures (from 150 up to 800 °C). Heraeus Hera Lock 2000 Low Temperature Co-fired Ceramics (LTCC) was chosen, because of its nearly zero shrinkage during firing. Also other LTCC types were used to comparison of results. Conductive and isolating thick film pastes are used for joining. Temperature cycling of samples was applied. Strength of cycled samples was investigated by mechanical shear tests. The structure of microsection of joints was analyzed using optical and scanning electron microscope. The results show that thick film pastes are usable for joining above mentioned materials in specific temperature range.
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Zou, Fan, Jiaqiang Dang, Xiaojiang Cai, Qinglong An, Weiwei Ming, and Ming Chen. "Hole quality and tool wear when dry drilling of a new developed metal/composite co-cured material." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 234, no. 6-7 (February 12, 2020): 980–92. http://dx.doi.org/10.1177/0954405420901420.
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The new developed metal/composite co-cured material composed of carbon fiber–reinforced plastic and Al phases has been increasingly applied for manufacturing of attitude control flywheel in aerospace industry. However, drilling of co-cured material is still a challenging task to produce holes with high quality and low cost in the assembly chain and dynamic balance debugging of attitude control flywheel. In other words, the relevant mechanisms and experimental findings involved in the drilling process of carbon fiber–reinforced plastic/Al co-cured material is not clearly defined, which impedes the progress of attitude control flywheel production. To this end, this article specially addresses the experimental studies on the drilling process of carbon fiber–reinforced plastic/Al co-cured material with standard TiAlN-coated cemented carbide twist drill. The significance of this work aims to reveal the regardful cutting responses of the hole characteristics and tool wear modes during the practical drilling process of co-cured material. A full factorial experiment including three levels of feed rate and four levels of cutting speed was performed. The hole diameter shows different values in different positions while it indicates consistent pattern regardless of the cutting variables: the largest in the Al phase, followed by the upper and lower carbon fiber–reinforced plastic phases, respectively. Grooves and matrix degradation are the major machining defects for carbon fiber–reinforced plastic layers, while a great chip debris adhered to the machined surface is the case for Al layer. Subsequent wear analysis showed that abrasion was mainly maintained at the vicinity of major/minor cutting edges and drill edge corner, followed by chip adhesion on the chisel edge region. Carbide substrate of drill flank face is exposed, and thereafter cavities are formed under the strong mechanical abrasion. These results could provide several implications for industrial manufacturers during the attitude control flywheel production.
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Vyacheslavov, A. V., V. V. Tsepkova, A. D. Titova, and T. N. Ermolaeva. "Analysis of surfacing materials from cast carbide alloys using inductively coupled plasma atomic emission spectrometry (ICP-AES)." Industrial laboratory. Diagnostics of materials 84, no. 6 (August 1, 2018): 5–10. http://dx.doi.org/10.26896/1028-6861-2018-84-6-5-10.
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A technique for analysis of surfacing materials (cast cobalt-based carbide alloys) using by ICP-AES in combination with microwave autoclave sample preparation is developed. Composition of the acid mixture, temperature and time parameters of the sample preparation under microwave heating in an autoclave are specified, thus ensuring complete quantitative transfer of the sample into a convenient analytical form without losses of volatile components for the subsequent ICP-AES analysis. Analytic lines of the elements free from spectral interference were chosen to determine all the rated components in the casting materials from cast carbide alloys. Study of surfacing materials was carried out using alloys Pr-B3K-PrH-U10Kh63B5, Pr-B3K-P-PrN-U20Kh57B10 and TsN-2-E-190K62X29B5C2, containing the alloying elements (% wt.): Co (up to 65); Cr (28.0 – 32.0); W (4.0 – 11.0); Si (1.0 to 3.0); C (1.0 – 2.0); Ni (0.1 – 2.0); Mn (0.3 – 0.6) and Fe (up to 2.0). The correctness of determining rated element was confirmed in analysis of standard samples using sample weight variation. The developed technique was tested on industrial prototypes of surfacing materials made of cobalt-based cast carbide alloys of tested grades. The method is rapid (11-fold reduction in the time of analysis) and reagent-saving (by 12.5 times) procedure compared to single-element methods by 11 times and reduction of the volume of applied reagents. Combination of the multielement ICP-AES method with microwave sample preparation provides an increase in the accuracy of Si, Cr, Mn, Fe, Ni, and W determination in surfacing materials of cast carbide alloys within a range of rated concentrations.
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Sauceda-Oloño, Perla Yazmin, Hector Cardenas-Sanchez, Anya Isabel Argüelles-Pesqueira, Cindy Gutierrez-Valenzuela, Mario Enrique Alvarez-Ramos, Armando Lucero-Acuña, and Paul Zavala-Rivera. "Micelle Encapsulation of Ferromagnetic Nanoparticles of Iron Carbide@Iron Oxide in Chitosan as Possible Nanomedicine Agent." Colloids and Interfaces 4, no. 2 (May 22, 2020): 22. http://dx.doi.org/10.3390/colloids4020022.
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In this work, the synthesis and characterization of core/shell nanoparticles of iron carbide@iron oxide (Fe3C/γ-Fe2O3) encapsulated into micelles of sodium dodecylsulfate and oleic acid and stabilized with chitosan was developed. The materials were sonosynthesized at low intensities using standard ultrasonic baths with iron pentacarbonyl (Fe(CO)5) and oleic acid as iron source and hydrophobic stabilizer, respectively; obtaining nanoparticles with a hydrodynamic diameter of 19.71 nm and polydispersive index (PDI) of 0.13. The iron carbide@iron oxide nanoparticles (ICIONPs) in oleic acid were used as the organic phase during the self-assemble of nanoemulsion with sodium dodecylsulfate in water to obtain the metastable micelles. The final step involved the stabilization of the micelles using low molecular weight chitosan solution at 2% in acetic acid by ultrasonication bath. The nanosystem showed a hydrodynamic diameter of 185.30 nm, a PDI of 0.15 with a superficial charge ζ of 36.70 mV. Due to the magnetic, physical and chemical properties previously measured of the ICIONPs, it is believed that this type of nanoparticles can be used as a possible nanomedicine agent.
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Kryukov, R. E., V. F. Goryushkin, Yu V. Bendre, L. P. Bashchenko, and N. A. Kozyrev. "Thermodynamic aspects of Cr2O3 reduction by carbon." Izvestiya. Ferrous Metallurgy 62, no. 12 (January 15, 2020): 950–56. http://dx.doi.org/10.17073/0368-0797-2019-12-950-956.
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In order to save resources of chromium, technology of flux-cored wire surfacing is of great practical interest. In this case Cr2O3 chromium oxide and carbon as a reducing agent are used as fillers. Thermodynamic assessment of probability of 16 reactions between them under standard conditions and for certain reactions under conditions different from standard was carried out using tabulated thermodynamic data of reactants in temperature range of 1500 – 3500 K. The following states were considered as standard states for reactants: Cr(ref) (reference state, melting point 2130 K, boiling point 2952 K), Cr(liq), Cr(gas), Cr2O3 (cr, liq), Cr2O3 (gas), C(ref), and as possible reaction products and standard states for them CO(gas), CO2 (gas), Cr23C6 (сr), Cr7C3 (cr), Cr3C2 (cr). Probability of reactions was estimated using standard Gibbs energy and the Gibbs energy calculated using the Van Goff isotherm equation. Dissolution of chromium in metal of surfacing bath or probable partial pressures of CO and CO2 in gas phase was taken into account and was calculated from equilibrium of carbon gasification reaction. Presence of carbon in flux-cored wire with chromium oxide Cr2O3 as a reducing agent will necessarily lead to occurrence of reduction reactions with generation of chromium carbides, and possibly chromium itself. Generation of Cr7C3 (сr) carbide is likely. With longer life time of chromium oxide and carbon at a temperature above 2500 K, generation of chromium as a component of the surfacing bath is more thermodynamically probable than generation of its carbides. Chromium oxide has the highest reactivity in Cr2O3 (liq) state. Direct reduction is preferential. Generation of CO(gas) as a product of carbon oxidation is more probable. Dissolution of chromium in metal increases thermodynamic probability of reactions with its generation and further reduces probability of reactions in which chromium is the starting material.
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Moskal, Grzegorz, Aleksander Iwaniak, and Bartosz Witala. "Characterization of Microstructure and Properties of Plasma Sprayed Ceramic Coatings on AZ91 Magnesium Alloy." Defect and Diffusion Forum 312-315 (April 2011): 571–76. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.571.
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The paper presents the microstructure test results of carbide layers with bond coat obtained on the magnesium alloy with WC/Co – NiCr – AZ91D type thermal spraying method. Layers were sprayed with the APS method on the sandblasted surfaces of approx. 5 mm thick elements manufactured with high pressure die casting (HPDC). The standard process parameters were used for the powders sprayed. The scope of the tests included characteristics of the AZ91D alloy top surface after HPDC process and after sandblasting. The stereometric analysis of surface was performed by using the laser profilometer. The top surface geometric parameters were determined and presented in the form of numbers and topographic maps. Both surfaces were subject to SEM analysis by using the Hitachi S3400N microscope and chemical composition analysis in micro areas (EDX analysis by using the Noran System Six software) to determine presence of impurities and other type of artefacts on the alloy surface before plasma spraying. The alloy surfaces were also subject to detailed tests after spraying process (on lateral micro-sections) to determine the influence of the spraying process on the substrate quality and consequently layer adhesion. Phase composition assessment of the NiCr 80/20 type bond coat and carbide layers WC/10Co and WC/8Co was also performed. Further tests referred to top surface morphology of both carbide layers and chemical composition assessment in micro areas.
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Garfias Bulnes, Andrea, Vicente Albaladejo Fuentes, Irene Garcia Cano, and Sergi Dosta. "Understanding the Influence of High Velocity Thermal Spray Techniques on the Properties of Different Anti-Wear WC-Based Coatings." Coatings 10, no. 12 (November 26, 2020): 1157. http://dx.doi.org/10.3390/coatings10121157.
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This work analyzes the differences found in hard metal coatings produced by two high velocity thermal spray techniques, namely high velocity oxy-fuel (HVOF) and high velocity air-fuel (HVAF). Additionally, the effect of the metallic matrix and ceramic composition and the original carbide grain size on coating properties is compared to the most studied standard reference material sprayed by HVOF, WC-Co. For this evaluation, the physical properties of the coatings, including feedstock characteristics, porosity, thickness, roughness, hardness, and phase composition were investigated. Several characterization methods were used for this purpose: optical microscopy (OM), scanning electronic microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), and X-ray Diffraction (XRD), among others. The final performance (abrasive wear and corrosion resistance) shown by the coatings obtained by these two methodologies was also analyzed. Thus, the abrasive wear resistance was analyzed by the rubber-wheel test, while the corrosion resistance was characterized with electrochemical methods. The characterization results obtained clearly showed that the coatings exhibit different microstructures according to feedstock powder characteristics (carbide grain size and/or composition) and the thermal spray process used for its deposition. Thus, the incorporation of WB to the cermet composition led to a high hardness coating, and the complementary hardness and toughness of the WC-Co coatings justify its better abrasion resistance. The presence of Ni on the metal matrix increases the free corrosion potential of the coating to more noble region. However, the WC-Co coatings show a lower corrosion rate and hence a higher protective performance than the rest of the coatings.
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Tjahjana, D. D. D. P., and Y. Waloyo. "Failure Analysis of Super Hard End Mill HSS-Co." Open Engineering 9, no. 1 (July 26, 2019): 202–10. http://dx.doi.org/10.1515/eng-2019-0025.
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AbstractThe failure of tools will make a large impact to the productivity, so it must be investigated to avoid the next failure. In this case, the super hard end mill HSS-Co list 4SE code 6210 was broken when it was used for side milling processing of mild steel AISI A36 with rotation speed, cutting speed and cutting depth of 540 rpm, 0.10 m/min (4 ipm) and 16 mm respectively. Standard procedure of failure analysis was performed including macro-micro investigation using Scanning Electron Microscopy (SEM) with energy-dispersive spectrometry (EDS) attachment, micro hardness test, and Finite Element Methods (FEM) simulation. The results of failure analysis showed that fracture occurred due to stress concentration and micro defects of the super hard end mill. Two parts of fracture surface, rough and fine surface were found. Based on SEM-EDS investigation, it was known that the content of tungsten (W) and cobalt (Co) elements on the rough and fine surface was inhomogeneous. Excessive Co and W elements appeared on the fine surface while they disappeared on the rough surface. Excessive Co will diffuse with tungsten and carbon and lead to the separation of tungsten and carbon elements, so it greatly destroyed the alloys and lead to form the non-stoichiometry carbide points. Hence, the defective manufacturing processes which made the elements distribute inhomogeneous is concluded as the reason of the super hard end mill failure.
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Pang, Zi Rui, Hai Lun Yuan, Jin Wu Xu, and Cheng Ming Wang. "Study on Carburizing and Quenching Cracks of Large Low-Alloy Gears." Advanced Materials Research 266 (June 2011): 110–13. http://dx.doi.org/10.4028/www.scientific.net/amr.266.110.
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Technology and metallographic of three kinds of representative gears were analyzed in this paper according to characteristics of carburizing and quenching, and technology problems met with during the carburization process of large low-alloy gears in Citic Heavy Industries Co., Ltd were also taken into account. Three conclusions are demonstrated through experimental results. Firstly, although carburization technology is normal, grinding cracks can be caused by hard particles included in matrix. Secondly, if carbon concentration of carburization layer is too high or too steep in carburizing technology, carbide will aggregate in reticular or structural stress will not be average during the subsequent quenching technology. And therefore grinding cracks are caused. Moreover, retained austenite of surface layer and subsurface layer will be over standard and thus grinding cracks will be caused if quenching temperature is too high during quenching technology after carburizing.
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Vincentraj, A., S. Kalyanasundharam, A. Arokiyaraj, N. Pasupathy, S. Leo Arokiaraj, and D. Sathya. "Underground Water Quality in Major Paddy Plants Growing Area of Mayiladuthurai Taluk of Nagapattinam District in Tamil Nadu – India." IRA-International Journal of Applied Sciences (ISSN 2455-4499) 7, no. 2 (May 27, 2017): 52. http://dx.doi.org/10.21013/jas.v7.n2.p1.
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<em><span>Water is essential for agriculture. Most of the farmers depending upon the ground water for irrigation purpose, but now a days the underground water is going to towards very deep down level. Because our environment affected by water drought, pollution and lack of rain falls. It will be creating negative effects to cultivation .In this present study is to assess the underground water quality in Mayiladuthurai Taluk of Nagapattinam District in Tamil Nadu. Totally 30 underground water samples were collected, which covers 10 Revenue villages in Mayiladuthurai Taluk, 3 samples from each Revenue village and analyzed all the physico - chemical parameters such as pH, EC, Ca, Na, K, SO<sub>4,</sub> Cl, Mg , CO<sub>3,</sub> and HCO<sub>3 </sub>and the water quality index SAR, RSC, Geo-chemical types, classification were determined by standard methods, standard calculation and by using standard instruments. Then the irrigation water quality results were compared with standard values Recommended by World Health Organization (WHO), Bureau of Indian Standards (BIS) and Indian Council of Medical Research (ICMR). The proposed work is very essential not only for crop production but also to maintain soil fertility, to maintain hazardous free environment and to enhance the living standard and in turn to uplift our Agriculturist.</span></em>
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Borysov, Viacheslav, Tetiana Solomko, Mykhail Yamshinskij, Ivan Lukianenko, Bohdan Tsymbal, Andrey Andreev, Viacheslav Bratishko, Tamara Bilko, Victor Rebenko, and Tetiana Chorna. "Identification of the features of structural-phase transformations in the processing of waste from the production of high-alloy steels." Eastern-European Journal of Enterprise Technologies 4, no. 12(112) (August 26, 2021): 33–38. http://dx.doi.org/10.15587/1729-4061.2021.238763.
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This paper reports a study into the peculiarities of the structural-phase composition of the alloy obtained by using anthropogenic waste from the production of high-alloy steels involving reduction melting. That is necessary for determining the technological parameters that could help decrease the loss of alloying elements in the process of obtaining and using a doped alloy. This study has shown that at an O:C ratio in the charge of 1.84, the alloy consisted mainly of the solid solution of carbon and alloying elements in α-Fe. The manifestation of Fe3C C carbide with alloying elements as substitution atoms was of relatively weak intensity. At the O:C ratios in the charge of 1.42 and 1.17, there was an increase in the intensity of the Fe3C carbide manifestation. At the same time, the emergence of the carbide compounds W2C·Mo2C and WC was identified. Several phases with different content of alloying elements were present in the microstructure images. Cr content in the examined areas changed in the range of 0.64–33.86 % by weight; W content reached 41.58 % by weight; Mo –19.53 % by weight; V – 18.55 % by weight; Co – 3.95 % by weight. The carbon content was in the range of 0.28–2.43 % by weight. Analysis of the study results reveals that the most favorable ratio of O:C in the charge was 1.42. At the same time, the phase composition was dominated by a solid solution of the alloying elements and carbon in α-Fe. The share of the residual carbon concentrated in the carbide component was in the range of 0.52–2.11 % by weight, thereby ensuring the required reduction capability of the alloy when used. The study reported here has made it possible to identify new technological aspects of obtaining an alloy by utilizing anthropogenic waste, and whose indicators provide for the possibility of replacing part of standard ferroalloys when smelting steels without strict restrictions on carbon content.
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Cheng, Yong. "Determination of Alloy and Impurity Elements in the WC-Co Based Cemented Carbide by Microwave Digestion - Inductively Coupled Plasma Atomic Emission Spectrometry." Applied Mechanics and Materials 271-272 (December 2012): 222–26. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.222.
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Using high-pressure sealed microwave heating method, the WC-Co based cemented carbide samples were digested completely by nitric acid and phosphoric acid (VHNO3: VH3PO4 = 5:1). Then the digestion solution was diluted with water to a constant volume, and directly using inductively coupled plasma atomic emission spectrometry (ICP-OES) determination of the content of 0.005 to 10% Co and 0.005 ~ 1% of Fe, Nb, Ta, V, Cr, Mo and Ni. This paper examine the best digestion conditions, including reagent composition, ratio, and microwave control parameters, etc., then establish a set of microwave digestion and by complex reactions with inorganic reagents to stabilize the high tungsten matrix digestion method, in order to quickly and completely digest the tungsten-cobalt-based samples and avoid the generation of tungsten acid precipitation resulting in the loss of some of the analyte and impact of organic complex agents on the spectral determination. The results showed that: the control parameters of using 5 min to heat the sample to 130 °C and keep for 5 min, then heated to 190 °C in 5 min and keep for 15 min is better to maintain the digestion. By optimizing elemental analysis line, ICP measurement parameters and matrix matching and synchronization of background correction method, the high tungsten matrix effects and spectral interference are eliminated; ensure the detection performance of the method. Background equivalent concentration of 5μg/L (Nb) ~ 18μg/L (Fe), elements of the detection limit of 4μg/L (Nb) ~ 13μg/L (Fe), which used for the determination of impurities in the alloy or elements with the results is RSD <3%, recovery 97.0% ~ 103.5% corresponding with the national standard examination method.
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Ragonese, Egidio, Nunzio Spina, Alessandro Parisi, and Giuseppe Palmisano. "A CMOS Data Transfer System Based on Planar RF Coupling for Reinforced Galvanic Isolation with 25-kV Surge Voltage and 250-kV/µs CMTI." Electronics 9, no. 6 (June 5, 2020): 943. http://dx.doi.org/10.3390/electronics9060943.
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This paper exploits an effective approach to overcome the breakdown limitations of traditional galvanic isolators based on chip-scale isolation barriers, thus achieving a very high isolation rating (i.e., compliant with the reinforced isolation requirements). Such an approach is based on radio frequency (RF) planar coupling between two side-by-side co-packaged chips. Standard packaging along with proper assembling techniques can be profitably used to go beyond 20-kV surge voltage without using expensive or exotic isolation components. As a proof of concept, a bidirectional data transfer system based on RF planar coupling able to withstand an isolation rating as high as 25 kV has been designed in a low-cost standard 0.35-µm CMOS technology. Experimental measurements demonstrated a maximum data rate of 40 Mbit/s using a carrier frequency of about 1 GHz. The adopted approach also guarantees a common mode transient immunity (CMTI) of 250 kV/µs, which is a first-rate performance in view of next generation galvanic isolators for wide-bandgap power semiconductor devices, such as gallium nitride high-electron mobility transistors (GaN HEMTs) and silicon carbide (SiC) MOSFETs.
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HOROWITZ, JOHN. "GREENHOUSE GAS OFFSETS: ANALYSIS OF BASELINE RULES AND ADDITIONALITY FOR REDUCED NITROGEN APPLICATION ON WHEAT." Climate Change Economics 05, no. 02 (May 2014): 1450002. http://dx.doi.org/10.1142/s201000781450002x.
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Agriculture is a source of greenhouse gas emissions that could be included as offsets in a cap-and-trade system. This paper describes offset rules that could be applied to reduced nitrogen fertilizer application on wheat, a source of nitrous oxide emissions. Unlike other papers that have examined offset rules, we do not assume that farmers' business-as-usual nitrogen emissions can be perfectly predicted. We construct a structural model of wheat production and use this, along with Agricultural Resource Management Survey data, to model or estimate participation in the offset market, offset supply conditional on participation, and business-as-usual emissions. We find that roughly two-thirds of the supplied offsets would be non-additional at an allowance price of $15/tonne CO 2-e. Under assumptions about the social damages from greenhouse gas emissions, we find that allowing nitrogen offsets would marginally pass a standard benefit-cost test.
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Dövényi-Nagy, Tamás. "Centre of Agri-Knowledge – a Web-Based Integration of Information and Decision Support Systems for Agriculture." Acta Agraria Debreceniensis, no. 10 (May 23, 2006): 64–66. http://dx.doi.org/10.34101/actaagrar/10/3466.
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The University Debrecen Centre of Agricultural Sciences acts as the centre and co-ordinator of agrarian higher education and consultation in the eastern region of Hungary. New internet technologies afford new chances to accomplish the institute’s mission to develop agriculture, environment and countryside in the area. As the main framework of integrated e-learning, e-business and research in the agrifood sector the development of an internet portal, the „Centre of Agri-knowledge” (CAK) has been started in the recent past.To support our students and education, to stay continuous in touch with our agricultural engineers we consider very important to build internet communities, where students, farmers, traders and researchers can share their knowledge and experience.In Europe same as in Hungary agriportals born and disappear continuously. Although CAK is still in its early stage of development, its comprehensiveness, professional backend and the experience of the Centre of Agricultural Sciences guarantee a new standard of online services in the Hungarian agrifood sector
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Amorim Filho, V. R., W. L. Polito, S. R. Oliveira, G. P. G. Freschi, and J. A. Gomes Neto. "Simultaneous determination of Cd and Pb in antibiotics used in sugar-cane fermentation process by GFAAS." Eclética Química 31, no. 2 (2006): 7–12. http://dx.doi.org/10.1590/s0100-46702006000200001.
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A method has been developed for the simultaneous determination of Cd and Pb in antibiotics used in sugar-cane fermentation by GFAAS. The integrated platform of transversely heated graphite atomizer was treated with tungsten to form a coating of tungsten carbide. Six samples of commercial solid antibiotics were analyzed by injecting 20 µL of digested samples into the pretreated graphite platform with co-injection of 5 µL of 1000 mg L-1 Pd as chemical modifier. Samples were mineralized in a closed-vessel microwave-assisted acid-digestion system using nitric acid plus hydrogen peroxide. The pyrolysis and atomization temperatures of the heating program of the atomizer were selected as 600°C and 2200°C, respectively. The calculated characteristic mass for Cd and Pb was 1.6 pg and 42 pg, respectively. Limits of detection (LOD) based on integrated absorbance were 0.02 µg L-1 Cd and 0.7 µg L-1 Pb and the relative standard deviations (n = 10) for Cd and Pb were 5.7% and 8.0%, respectively. The recoveries of Cd and Pb added to the digested samples varied from 91% to 125% (Cd) and 80% to 112% (Pb).
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Bogodukhov, S. I., E. S. Kozik, and E. V. Svidenko. "Influence of thermal cycling modes on VK8 hard alloy mechanical and tribological properties." Izvestiya vuzov. Poroshkovaya metallurgiya i funktsional’nye pokrytiya, no. 4 (December 15, 2020): 55–65. http://dx.doi.org/10.17073/1997-308x-2020-4-55-65.
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Hard alloys are popular materials widely used in the toolmaking industry. Refractory carbides included in their composition make carbide tools very hard (80 to 92 HRA) and heat-resistant (800 to 1000 °С) so as they can be used at cutting speeds several times higher than those used for high-speed steels. However, hard alloys differ from the latter by lower strength (1000 to 1500 MPa) and the absence of impact strength, and this constitutes an urgent problem. We studied the influence of thermal cycling modes on the mechanical and tribological properties of VK8 (WC–8Co) hard alloy used in the manufacture of cutters and cutting inserts for metal working on metal-cutting machines. As the object of study, we selected 5×5×35 mm billets made of VK8 (WC–8Co) alloy manufactured by powder metallurgy methods at Dimitrovgrad Tool Plant. The following criteria were selected for heat treatment mode evaluation: Vickers hardness, flexural strength, and mass wear resistance (as compared to the wear of asreceived samples that were not heat treated). Plates in the initial state and after heat treatment were subjected to abrasion tests. Wear results were evaluated by the change in the mass of plates. Regularities of the influence of various time and temperature conditions of heat treatment on the tribological properties of products made of VK group tungsten hard alloys were determined. An increase in the number of thermal cycling cycles improved such mechanical properties of the VK8 hard alloy as strength and hardness. When repeating the cycles five times, an increase in abrasive wear resistance was obtained compared to the initial nonheat-treated sample. The elemental composition of the VK8 hard alloy changed insignificantly after thermal cycling, only a slight increase in oxygen was observed on the surface of plates. The grain size after thermal cycling increased in comparison with the initial VK8 hard alloy. It was found that VK8 hard alloy thermocyclic treatment leads to a change in the phase composition. X-ray phase analysis showed the presence of a large amount of α-Co with an hcp-type lattice on the surface of a hard alloy and a solid solution of WC in α-Co. A change in the cobalt modification ratio causes a decrease in microstresses. An analysis of the carbide phase structure state showed that the size of crystallites and microstresses changed after thermal cycling. The lattice constant of the cobalt cubic solid solution decreased, which may indicate a decrease in the amount of tungsten carbide and carbon dissolved in it. Statistical processing of experimental results included the calculation of the average value of the mechanical property, its dispersion and standard deviation in the selected confidence interval.
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Shipton, Parker. "Luo entrustment: foreign finance and the soil of the spirits in Kenya." Africa 65, no. 2 (April 1995): 165–96. http://dx.doi.org/10.2307/1161189.
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This article examines the cultural dimensions of financial credit and debt, placing these against a deeper and broader background of entrustments and obligations. A standard response of the largest international aid agencies to African rural poverty has been to set up programmes to lend money and other resources to rural people without understanding what the borrowers already owe to other creditors and claimants, or how strong these competing claims are. The history of credit programmes has been a history of dismal failures and of disappointments for borrowers and lender alike, particularly where land mortgages have been involved. Intensive field research reveals that Luo farmers in Kenya, like other East Africans, already have a broad assortment of borrowings and lendings of their own, some far more meaningful to them than loans from banks, co-operatives, or marketing boards will ever be. Some are only partly economic in nature; some involve sacred trusts or important political contacts. Land, labour, animals, money, and humans themselves are all objects of entrustment and obligation among kin, neighbours, or other familiars. Farmers channel resources from socially distant institutions into uses that are often locally more meaningful than those their lenders intend; and they may not be at liberty to convert them back into liquid forms for repayment. Requirements of land title collateral misfit a cultural context where attachments to land, and to ancestral graves on it, symbolise an individual's or family's social identity. More broadly, the credit strategy of development aid needs rethinking. Rather than continuing to enmesh rural Africans in debts and uncertainties, those who purport to help reduce poverty in rural Africa should shift their strategy from lending to encouraging saving and investment, or to promoting other kinds of locally rooted initiatives not financial in nature.
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Czarniak, Paweł, Karol Szymanowski, and Peter Panjan. "Influence of the microstructure of tool coatings based on Ti and Al on the blunting process during chipboard processing." Annals of WULS, Forestry and Wood Technology 112 (December 31, 2020): 54–59. http://dx.doi.org/10.5604/01.3001.0014.7356.
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Influence of the microstructure of tool coatings based on Ti and Al on the blunting process during chipboard processing.This work concerns three different tool coatings containing Ti and Al. i.e. TiN, AlTiN, TiAlSiN applied to cutting tools used in the machining of wood materials. In the case of the AlTiN coating, a multilayer structure with alternately arranged AlTiN and TiN nano-layers was used. The above coatings were applied to standard replaceable knives used for CNC milling heads made of WC-Co cemented carbide. The deposition process was carried out using the RF Magnetron Sputtering method. During the measurement on a workshop microscope, the VBmax index measured on the clearance face was adopted as the wear criterion. The research proved a very good behaviour of the TiN/AlTiN multilayer coating, for which the longest average service life which was recorded exceeded the results obtained for the reference tool by about 30%. The addition of silicon, which was supposed to increase the abrasion resistance, only did not improve the durability of the blade, it actually worsened it by 6%. In addition, the coating, which has been widely used in the machine industry for a very long time, i.e. TiN, did not extend the tool life significantly (+ 7%).
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Czarniak, Paweł, Karol Szymanowski, and Peter Panjan. "Characteristic of the wear of a tool coating based on amorphous carbon during chipboard milling." Annals of WULS, Forestry and Wood Technology 111 (September 30, 2020): 53–59. http://dx.doi.org/10.5604/01.3001.0014.6652.
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Characteristic of the wear of a tool coating based on amorphous carbon during chipboard milling. The study verified the durability and the course of wear during the durability tests of the TiAlN / a-C:N double tool coating. The aforementioned coating consisted of a bottom layer of TiAlN and a top layer based on nitrogenenriched amorphous carbon. Standard replaceable cutters for milling heads made of WC-Co sintered carbide were subjected to the modification process. The coating was applied using plasma by RF Magnetron Sputtering. During the tests, the blade wear was measured using a workshop microscope. The VB max indicator measured on the clearance face was adopted as the blunting criterion and its maximum value was set on 0,2 mm. The results show that the additional coating of amorphous carbon contributed to the increase of the tool durability determined with cutting distance. The use of only a single layer based on TiAlN shortened the durability by about 3%. On the other hand, applying both the bottom and top layers TiAlN /a-C:N) extended the cutting distance by about 24%. The research showed a clear advantage in terms of the durability of the blades modified with a multi-layer coating in relation to a single-layer. Moreover, the positive effect of the top layer containing amorphous carbon on tool durability has been demonstrated.
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Petheram, R. J., and R. A. Clark. "Farming systems research: relevance to Australia." Australian Journal of Experimental Agriculture 38, no. 1 (1998): 101. http://dx.doi.org/10.1071/ea96055.
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Summary. Farming systems research was introduced into many international and national agricultural research institutes in lower income countries in the 1970s and 1980s with the purpose of improving the relevance of research for small-scale farmers. This review outlines the origin, context, goals, principles and process of farming systems research in these countries, and aims to enable agricultural professionals to assess the relevance and value of farming systems research to their work in particular situations in Australia and overseas. The key elements of farming systems research include a holistic approach, orientation towards the needs of defined target groups, high levels of farmer participation and hence co-learning by farmers and specialists. There is guidance by facilitators, continuous evaluation and linkage to policy makers. The goal of farming systems research is to improve the well-being of farmers through development of farming systems. It involves application of methods from various disciplines, first to define the constraints and opportunities for development and then to overcome these in a research process involving farmers, with specialists and policy makers. A generalised farming systems research procedure and various research activities are described. Initially in lower income countries, a fairly standard farming systems research procedure was used, but farming systems research has evolved to encompass a range of activities commonly regarded as the realm of agricultural extension or rural development. Basic science, applied science and farming systems research are compared in terms of the roles and relationships of the people involved in the research process. The implications of selecting farming systems research as a model for rural research and development are discussed. Achieving adequate levels of farmer participation can be a major issue in farming systems research so it is important that the principal notions of participation are understood. Success of farming systems research in Australia will depend on developing innovative ways of achieving high levels of participation. Current trends in the philosophy, practice and funding of agricultural research and extension in Australia make it timely to consider the wider adoption of farming systems research principles and practices. Farming systems research could provide a valuable philosophical and practical basis for the trend towards greater participation by researchers with end-users and extension practitioners in agricultural development programs. However, it seems unwise to adhere strictly to any one particular model of research and development from other places: farming systems research concepts are being combined successfully with those from other models, such as systems learning and computer modelling, to suit the needs of particular situations. Implications of a wider adoption of farming systems research in Australia for agricultural research and development organisations and professional bodies include, the establishment of multidisciplinary teams with shared goals, and the sourcing of funding for periods long enough to achieve outcomes. There is also a need for training in systems concepts and facilitation, for reputable channels of publication of the results of farming systems research and for greater recognition of participatory activities as valid forms of agricultural research.
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Mawunu, Monizi, Thea Lautenschläger, Koto-te-Nyiwa Ngbolua, Lukoki Luyeye, and Luyindula Ndiku. "Proximate and Mineral Composition of Nsala Bakala (Dracaena camerooniana Baker) Leaves, Stems and Roots from Nzenze Forest in Uíge Province, Angola." European Journal of Biology and Biotechnology 2, no. 4 (July 31, 2021): 11–19. http://dx.doi.org/10.24018/ejbio.2021.2.4.225.
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The aim of the present work was to perform nutritional analysis of Dracaena camerooniana Baker. Nutrient determination was carried out according to standard methods. The nutritional profile of the leaves, roots and stems of D. camerooniana showed that these organs are rich in fibre (14.20-53.65%), proteins (4.47-18.58%), lipids (1.53-5.42%) carbohydrates (23.67-70.94%), ash (2.17-15.59%) and mineral elements, namely, K (535.07-1690.00 mg/100 g), Ca (315.87-1459.97 mg/100 g), Mg (95.41-498.83 mg/100 g), P (76.72-149.56 mg/100 g), Na (105.83-113.60 mg/100 g), Se (75.87-128.51 mg/100 g), Fe (40.88-228.30 mg/100 g), Mn (7.41-11.39 mg/100 g), Zn (2.94-5.83 g/100 g), Cu (2.30-2.80 mg/100 g), and Co (0.65-2.80 mg/100 g) The different levels of nutrient contents observed in the analyzed organs of D. camerooniana would be attributed to the accumulative capacities of the plant organs. It is therefore recommended (desirable) that further studies be conducted to determine the content of anti-nutritional factors in this plant on the one hand and to evaluate its pharmaco-biological properties on the other. Domestication of the plant should be done to ensure its conservation with the support of local farmers. Thus, the use of biotechnology would allow the availability of healthy plant material for both present and future generations.
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Daba, Nano Alemu, Abduletif Ahmed, and Muktar Mohammed. "Impact of Brewery Waste Sludge on Sorghum (Sorghum bicolor L. Moench) Productivity and Soil Fertility in Harari Regional State, Eastern Ethiopia." Turkish Journal of Agriculture - Food Science and Technology 5, no. 4 (April 7, 2017): 366. http://dx.doi.org/10.24925/turjaf.v5i4.366-372.1058.
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The study was conducted on farmers' field in sofi district of Harari Regional State during 2013/2014 main cropping season, eastern Ethiopia, to investigate the impact of brewery sludge on sorghum production and soil fertility. The treatments comprised seven levels of brewery sludges (0, 2.5, 5.0, 7.5, 10.0, 12.5 and 15.0 t ha-1) and NP inorganic fertilizer at recommended rate, arranged in randomized complete block design with four replications. Application of brewery sludge at 15 t ha-1 significantly increased the yield and biomass yield of sorghum by 79 and 85% over control and by 57 and 67% over NP application, respectively. There was no effect of brewery sludge application on heavy metals concentrations in soil after crop harvest, compared to international standard tolerable level. Co and Se levels were high in the control as well as in the soils treated with brewery sludge indicating the already high concentration of these heavy metals in the soils of the area. Plots, which received higher brewery sludge application, resulted in decreased or less percentage of grain nitrogen content showing the independence of grain protein content on lower brewery sludge level. The nitrogen uptake by sorghum grain, straw and the total was maximum (52.68, 44.25 and 79.03 kg ha-1, respectively) with the application of brewery waste sludge at 10 and 15 t ha-1 which were significantly higher than the other brewery sludge and NP mineral fertilizer applications.
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Karpagam, V., S. Jebaraj, and S. Rajeswari. "Combining ability and heterosis analysis for drought tolerant traits in rice (Oryza sativa L.)." Journal of Applied and Natural Science 8, no. 2 (June 1, 2016): 674–82. http://dx.doi.org/10.31018/jans.v8i2.857.
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Rice is the most important staple food for more than half of the world’s population and also for most of the countries. A Line x Tester analysis was undertaken to study the nature of gene action for yield and drought tolerant traits. The ratio of SCA and GCA was less than unity for all the characters which revealed that the preponderance of non- additive gene action governing the traits concerned. The lines viz., ADT 43, ADT (R) 49, CO (R) 50 and the testers viz., PMK (R) 3, Chandikar and Anna (R) 4 were adjudged as the best general combiners for drought tolerant traits. The cross combinations viz., ADT 39 x Vellaichitraikar had exhibited significant values for dry root weight (9.66), root/shoot ratio (0.31), root length (3.82), number of roots per plant (37.08), root thickness (0.11), root volume (4.27) and root length density (0.03) ADT (R) 49 x Chandikar for 70 percent relative water content (8.85), dry root weight (18.03), dry shoot weight (40.55), root length (3.10), number of roots per plant (140.16) root thickness (0.38) and root volume (23.14) were found to be specific combiners for most of the drought tolerant traits. The cross combinations, viz., ADT 43 x Anna (R) 4, ADT (R) 49 x Chandikar and ADT 43 x PMK (R) 3 had highly significant standard heterosis. Breeding for drought tolerance in rice would be of immense value to the farmers economic health, family well-being and harmony in the society.
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Dhar, Sukanya, Pallavi Arod, K. V. L. V. Narayan Achari, and S. A. Shivashankar. "MOCVD of a Nanocomposite Film of Fe, Fe3O4 and Carbon Nanotubes from Ferric Acetylacetonate: Novel Thermodynamic Modeling to Reconcile with Experiment." MRS Proceedings 1752 (2015): 45–50. http://dx.doi.org/10.1557/opl.2015.7.
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ABSTRACTThermodynamic modeling of the MOCVD process, using the standard free energy minimization algorithm, cannot always explain the deposition of hybrid films that occurs. The present investigation explores a modification of the procedure to account for the observed simultaneous deposition of metallic iron, Fe3O4, and carbon nanotubes from a single precursor. Such composite films have potential application in various device architectures and sensors, and are being studied as electrode material in energy storage devices such as lithium ion batteries and supercapacitors.With ferric acetylacetonate [Fe(acac)3] as the precursor, MOCVD in argon ambient results in a nanocomposite of CNT, Fe, and Fe3O4 (characterized by XRD and Raman spectroscopy) when growth temperature T and total reactor pressure P are in the range from 600°C-800°C and 5-30 torr, respectively. No previous report could be found on the single-step formation of a CNT-metal-metal oxide composite. Equilibrium thermodynamic modeling using available software predicts the deposition of only Fe3C and carbon, without any co-deposition of Fe and Fe3O4, in contrast with experimental observations. To reconcile this contradiction, the modeling of the process was approached by taking the molecular structure of the precursor into account, whereas “standard” thermodynamic simulations are restricted to the total number of atoms of each element in the reactant(s) as the input. When Ocon (statistical average of the oxygen atom(s) taken up by each metal atom during CVD) is restricted to lie between 0 and 1, thermodynamic computations predict simultaneous deposition of FeO1-x, Fe3C, Fe3O4 and C in the inert ambient. At high temperature and in a carbon-rich atmosphere, iron carbide decomposes to iron and carbon. Furthermore, FeO1-x yields Fe and Fe3O4 when cooled below 567°C. Therefore, the resulting film would be composed of Fe3O4, Fe and C, in agreement with experiment. The weight percentage of carbon (∼40%) calculated from thermodynamic analysis matches well with experimental data from TG-DTA.
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Utsis, N., R. Vidruk-Nehemya, M. V. Landau, and M. Herskowitz. "Novel bifunctional catalysts based on crystalline multi-oxide matrices containing iron ions for CO2 hydrogenation to liquid fuels and chemicals." Faraday Discussions 188 (2016): 545–63. http://dx.doi.org/10.1039/c5fd00174a.
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Seven solid mono-, bi- and tri-metallic oxide matrices where Fe(2+,3+) ions are distributed in different chemical/spatial environments were synthesized and characterized by XRD, N2-adsorption and EDAX methods. After basification with potassium, all matrices were activated by carburization or reduction–carburization under conditions selected based on the TPC/TPR spectra, tailoring the carburization extent of iron. The performances of the activated Fe-based catalysts with respect to CO2 conversion and C5+ selectivity were measured in a fixed-bed reactor under standard conditions in transient and continuous operation modes in units containing one or three reactors in series with water separations between the reactors. The catalysts were characterized by XRD, N2-adsorption, HRTEM-EELS and XPS before and after steady-state operation in the reactors. It was found that the rate of CO2 conversion is not limited by thermodynamic equilibrium but is strongly restricted by water inhibition and it depends on the nature of the Fe-oxide precursor. The ratio between the FTS and RWGS rates, which determines the C5+ hydrocarbons productivity, is strongly affected by the nature of the Fe-oxide matrix. The catalysts derived from the Fe–Al–O spinel and Fe–Ba–hexaaluminate precursors displayed the best balance of the two functions RFTS/RRWGS = 0.77–0.78. They were followed by magnetite, CuFe–delafossite, K–ferrite, Fe–La–hexaaluminate and LaFe–perovskite with a gradual lowering of RFTS/RRWGS from 0.60 to 0.15 and a gradual decrease in the C5+ productivity. The active sites that enhance the RWGS reaction are located on the surface of the Fe-oxide phases, while the FTS and methanation reactions occur on the surface of the Fe-carbide phases.
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Wathanga, Joshua, Professor George O. K’Aol, and Dr Joseph K. Ngugi. "EFFECT OF COMPREHENSIVE STRATEGIC DECISION-MAKING AND LONG-TERM ORIENTATION ON THE ORGANIZATIONAL PERFORMANCE OF DAIRY CO-OPERATIVES IN KENYA." Human Resource and Leadership Journal 2, no. 3 (October 13, 2017): 26. http://dx.doi.org/10.47941/hrlj.202.
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Purpose: The purpose of this study was to investigate the effect of comprehensive strategic decision-making and long-term orientation on the organizational performance of dairy co-operatives in Kenya.Methodology: The study adopted the positivist research philosophy and descriptive correlational research design. The population of the study consisted of 198 executive directors/managers of active dairy co-operatives in eight counties in the Mt. Kenya region. A sample size of 184 was drawn using stratified random sampling, and data was collected using self-administered questionnaires. The data was then analyzed using descriptive statistics of frequency, mean, and standard deviation. Additionally, inferential data analysis methods of Pearson’s correlation, ANOVA, and multiple linear regression were used to test the hypotheses.Results: The multiple linear regression results indicated that long-term orientation significantly predicted revenue per customer, b = 9.85, t(141) = 3.35, p <.05 and product innovation, b = 1.56, t(141) = 1.43, p < .05. It was also found that revenue per customer explained 49.7% of the variance, (R2 = .497, F(5, 125) = 13.27, p < .05, while ROA explained 29.4 %, (R2 = .294, F(5, 123) = 9.06, p < .05. Product innovation explained 41.2% of the variance, (R2 = 0.412, F(9, 120) = 9.35, p < .05. In relation to the moderating variable, the regression results revealed that market orientation significantly predicted revenue per customer, b = 1.64, t(141) = 7.66, p < .05; ROA, b = 2.14, t(141) = 3.35, p < .05; and product innovation, b =1.89, t(141) = .53, p < .05. It was also found that revenue per customer explained 49.7% of the variance, (R2 = .497, F(5, 125) =13.27, p < .05, while ROA explained 29.4 %, and product innovation explained 41.2%. However, the results showed that market orientation did not significantly moderate the relationship between corporate governance and organizational performance. Comprehensive strategic decision-making was not significant in explaining revenue per customer, ROA, and product innovation.Unique contribution to theory, practice and policy: While previous studies on corporate governance of co-operatives have relied largely on agency theory and shareholder wealth maximization, this study was based on stewardship theory to show its effect on the organizational performance of dairy co-operatives. The inclusion of market orientation as a moderating variable is of great interest to academia in establishing a better link between corporate governance of co-operatives and similar agricultural enterprises, and their performance. The co-operative sector, other social enterprises and the government of Kenya will benefit from this study as its results can help identify the areas for governance policy development as well as regulatory legislation needed by the sector so as to improve dairy farming for the farmers and the national economy as a whole.
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Utami, Dwinita Wikan, Maulidia Rahmawati, Siti Yuriyah, Ahmad Dadang, Siti Nurani, and Nurul Jadid. "Molecular Breeding for Developing A New Upland Rice Variety ‘Bio Patenggang Agritan’." Jurnal AgroBiogen 15, no. 1 (September 3, 2019): 1. http://dx.doi.org/10.21082/jbio.v15n1.2019.p1-10.
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<p>Situ Patenggang is an elite upland rice variety well-accepted by farmers, but recently this variety started to be attacked by blast disease (Pyricularia grisea) that causes yield loss up to 50%. To overcome this problem, Bio Patenggang variety has been developed through molecular breeding using blast-resistant monogenic lines as donor parents. The aim of this research was to present molecular breeding approach of Bio Patenggang development, including steps from the phenotypic selection on candidate lines to the genotypic analysis assisted by molecular markers. The phenotypic performances were assessed using Distinctness, Uniformity, and Stability (DUS) testing by following the standard method stated in the rice test guidelines. The genotypic analyses were performed using foreground and background markers. Four BC3F7 lines were selected as the candidates of the Situ Patenggang-derived variety. Based on ANOVA and Principal Component Analysis (PCA), phenotypic performances of the four lines demonstrated no significant differences with that of Situ Patenggang. The selected lines have also passed the foreground analysis confirming that the lines contained Pita, Pii, Pik-p, and Pia last resistance genes. Background analysis showed that the selected lines demonstrated agronomic perfomances very similar to that of Situ Patenggang. Association analyses showed that 14 markers were associated with the target traits and 10 out of the 14 markers were identified as co-segregation markers. The four selected lines, therefore, were proposed to be released as Situ Patenggang-derived variety. One of the lines (Sta-8-S15-TB16) has been approved to be released as a new variety, namely ‘Bio Patenggang Agritan’.</p>
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Gautam, Prachand, Polina Dahal, Sushila Patel, and Sweta Singh. "Epidemiology of Bacterial Keratitis in Lumbini Eye Institute." Journal of Chitwan Medical College 9, no. 3 (September 25, 2019): 69–73. http://dx.doi.org/10.3126/jcmc.v9i3.25786.
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Background: Bacterial keratitis is a common sight threatening condition. Untreated, it often leads to progressive tissue destruction with corneal perforation or extension of infection to adjacent tissue. The aim of the study was to study the epidemiological characteristics of bacterial keratitis seen at Lumbini eye institute in western part of Nepal.
Methods: A retrospective study was done from 1st November 2017 to 30th October 2018 in which records of all culture-positive bacterial keratitis over a 1 year period. Data regarding age of patient, occupation, type of injury, coexisting ocular disease was recorded. Clinical evaluation corneal scrapings were collected and subjected to culture and microscopy using standard protocols in all patients.
Results: Out of 800 corneal ulcer cases, 305(38.12%) were found to be of bacterial aetiology. A total of 100(32.78%) bacterial pathogens were isolated of which predominant bacterial species Staphylococcus epidermidis 56(56%) followed by Staphylococcus aureus 21(21%), Pseudomonas aeruginosa 12(12%), Streptococcus viridans 5(5%), Nocardia 4(4%) and Streptococcus pneumonia 2(2%) were isolated. Patients with age >45 years were 71(71%) and < 45 years were 29(29%). Among these, (55)55% of patients were non-agricultural workers and (45)45% were farmers; this difference was statistically not significant (p>0.0001). Co-existing ocular diseases predisposing to corneal ulceration were identified only in 19(19%), compared to other predisposing risk factors in 81(81%).
Conclusions: The epidemiological characteristic of bacterial keratitis varies geographically. This study describing the features of bacterial keratitis would greatly help the practicing ophthalmologist in the management of their patients.
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Cole, Z., B. McGee, J. Stabach, C. B. O'Neal, and B. Passmore. "A High Temperature, High Power Density Package for SiC and GaN Power Devices." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, HiTEN (January 1, 2015): 000208–13. http://dx.doi.org/10.4071/hiten-session6-paper6_3.
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In this work, a compact 600 – 1700 V high current power package housing either silicon carbide (SiC) or gallium nitride (GaN) power die was designed and developed. Several notable configurations of the package include diode half-bridges, co-packed MOSFET-diode pairs, and cascode configured GaN devices. In order to avoid a significant redesign effort for each new application or improvement in device technology, a device-neutral design strategy enables the use of a variety of die types from any manufacturer depending on the end-use application's requirements. The basic SOT-227 is a widely used package type found in everything from electronic welders and power supplies to motor controls and inverters. This module is a variant of that style of package which also addresses some issues that a standard SOT-227 package has when used in higher voltage applications; it has increased creepage and clearance distances which meet IPC, UL, and IEC standards up to 1700 volts while retaining an isolated substrate. It also has low parasitic values in comparison to the SOT-227. One of the key elements of this design is the removal of the baseplate. This allows for far lower weight, volume, and cost as well as reduced manufacturing complexity. The wide bandgap power package is composed of high temperature capable materials, which allow for the high junction temperatures inherent in these high power density devices. This paves the way for the design of a small, low-profile package with low parasitic inductances and a small junction-to-case thermal resistance. This paper will discuss the mechanical design of the power package as well as the three-dimensional finite-element modeling and analysis of the thermal, electrical, and mechanical characteristics. In addition, the electrical characteristics as a function of temperature of the power module up to 225 °C will be presented.
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Hoque, MZ, and ME Haque. "Socio-economic Factors Influencing Profitability of Rice Seed Production in Selected Areas of Bangladesh." Agriculturists 12, no. 1 (July 18, 2014): 33–40. http://dx.doi.org/10.3329/agric.v12i1.19578.
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Seed is the foundation of agriculture for enhancing crop production. The economic benefits from the improved quality seed production help scaling up the livelihood standard as well as nutritional status of the common people. The study was carried out in three districts namely Jamalpur, Gazipur and Manikganj to identify the socio-economic dimensions of the government seed production project beneficiaries persuading profitability of rice seed production. Data were collected through intensive survey of randomly selected 211 sample respondents using pre-tested interview schedule. To examine the profitability of rice seed production, the gross margin and cost benefit analysis were carried out. Co-efficient of correlation and multiple stepwise regressions were employed to find out the determinants of profitability in rice seed production. Rice seed production was not found to be so profitable as investment in rice seed cultivation can produce average BCR of only up to 1.44, where highest BCR was found in Jamalpur (1.58) compared to Manikganj (1.48) and Gazipur (1.26). The results revealed that socio-economic factors have a profound influence on profitability of rice seed production as these factors combined explained 54.9 percent variation. Farm size, contact with information sources, knowledge on quality rice production and age of the respondents were identified as significant contributors in profitability of rice seed production, whereas contact with information sources was the single most influential factor (24.6%). Therefore, steps may be taken so that the seed-growers could directly be linked with more information sources dealing with seed production and marketing through the government initiatives to boost up the production as well as to ensure appropriate price of the farmers home grown seed. DOI: http://dx.doi.org/10.3329/agric.v12i1.19578 The Agriculturists 2014; 12(1) 33-40
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N., Muhammad,, Manu, H.I., Maina Bukar, Y., and Abdullahi, Y.R. "CLIMATIC VARIABILITY AND LIVELIHOOD VULNERABILITY IN KADUNA STATE, NIGERIA." International Journal of Climatic Studies 1, no. 1 (August 2, 2017): 36–53. http://dx.doi.org/10.47604/ijcs.432.
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Purpose: This paper focused on livelihood vulnerability induced by climatic variability amongst farming households in Kaduna state, Nigeria.
Methodology: The research used a sample population of 400 using Taro Yamane formula which represents about 0.05% of the population of the three selected local government areas and it purposively targeted farming households heads (FHHH) in one of each of the three eco-climatic zones in the state. Kagarko, BirninGwari and Makarfi local government areas were based on their eco-climatic location and rurality to represent humid, sub-humid and dry sub humid zones of the state respectively. A multi stage sampling technique was further adopted in which farming districts and villages were selected for the administration of 400 structured questionnaires proportionately distributed proportionately to the three local government areas. The Department for International Development (DFID) sustainable livelihoods framework was adopted in the design of the structured questionnaires. Coefficient of Variation (CV %) was deployed to determine the variability of rainfall and temperature of the three eco-climatic zones of the past thirty six years (1981-2016) which was employed into the Micah Hahn’s Livelihood Vulnerability Index model.The results show that Kagarko (humid) had a CV% of 105.43 of rainfall, 9.06 CV% of maximum temperature and CV% of 17.63 in minimum temperature. BirninGwari (sub-humid) had a CV% of 119.64 in rainfall, CV% of 14.17 in maximum temperature and CV% of 15.92 in minimum temperature while Makarfi (dry sub-humid) had a CV% of 124.71 in rainfall, CV% of 9.72 in maximum temperature and 16.29 CV% in minimum temperature. The livelihood vulnerability index (LVI) of Kagarko was calculated to be 0.35, Makarfi and BirninGwari were calculated to be 0.36 respectively and vulnerability spider diagrams were used to capture and compare results. On a vulnerability scale of 0-1, the three eco-climatic zones were found to be very vulnerable to climatic variability. The paper has proved the applicability of Co-efficient of Variation (CV %) into the LVI model which is a departure from previous users who have consistently deployed Mean Standard Deviation into the model.
Results: This study will serve as a spring board to meet the Sustainable Development Goals (SDGs) targets on vulnerable communities in Kaduna state. It is discovered that farmers in Makarfi and BirninGwari, even though in different eco-climatic zones of sub-humid and dry sub humid zones respectively, share equal level of livelihood vulnerability index of 0.36 while Kagarko area which is in humid zone, is having 0.35. These indicated that all the areas are within the very vulnerable values on a vulnerability scale of 0-1. The vulnerability levels of the study area can be attributed to weak Natural, Financial and Physical capitals.
Recommendations: The paper recommended Integrated Farmers’ Livelihoods Support Strategy (IFLISS) so as to build the resilience of farming households’ livelihood capitals and reduce vulnerability levels.
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George, Majo, and Elsa Cherian. "Emergent Global Marketing Challenges for Kerala Cardamom Producers Vis-A-Vis Role of the Spice Board." International Journal of Community Development and Management Studies 1 (2017): 039–61. http://dx.doi.org/10.31355/10.
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NOTE: THIS ARTICLE WAS PUBLISHED WITH THE INFORMING SCIENCE INSTITUTE. Aim/Purpose.................................................................................................................................................................................................. This research paper attempts to deeply and rationally probe into the present situation, discussing the expected role of the Spices Board of India, which in 1987 started to function replacing the erstwhile Cardamom Board, where the focus was only on the Cardamom plantation sector and export development. Background.................................................................................................................................................................................................. Cardamom, the “Queen of Spices” is the third most expensive of the spices, next only to saffron and vanilla. The Cardamom Plantation and export development sector is now just one of the many focal points of expected action of promotional endeavors of the Spices Board of India. The cardinal problem is the 1990's market threat from Guatemala, which floods the market with Cardamom with cheaper prices, though it is qualitatively inferior to Indian green Cardamom. The second problem for Indian exports is that the higher cost of production coupled with increasing domestic market demand causes lower quantities for exports. Apart from the functional insufficiency of the Spices Board of India, in the view of the Cardamom farmers and secondary and tertiary market intermediaries, the present auction system, the scattered unorganized farming community at large, and other governmental promotional deficiencies together make the complexity of the present situation confounded. Methodology.................................................................................................................................................................................................. It was decided that conventional research methods, using structured survey methods and questionnaire, were not feasible or realistic as collecting data from a wide range of personnel vary from cardamom farmers to wholesalers to market intermediaries including exporters, extractors of oleo resin from cardamom proved arduous. For this study the methodology used to gather information was a mixture of ethnographic and classical statistical sampling methods. The data was mainly collected by interviews as this will help to get an in depth feel of the pulse of all the involved participants. Thus it was felt that a more first-hand personal interactions was really necessary, not to just garner information from quantitative data but also to gauge through the in-person mood and tenor the grievances of all concerned with cardamom industry and to know the expectations of the related parties, especially from the Spices Board of India. Contribution.................................................................................................................................................................................................. This paper attempts to bring into focus the provocations, limitations, and seriousness of the situation of the sector, and to prioritize the steps to be taken to regain the lost glory of the Indian Cardamom. Findings........................................................................................................................................................................................................ The findings and analysis show that the Indian Cardamom Plantation Sector should be aware of the significance and market relevance of the “Organic” method of cultivation of Cardamom. Also there is a need for quality control practices in the sector that enable strict attention to meeting MRL (Maximum Residue Level) as demanded by the importing nations, and attention to the “functional refining factors” and expectations set out by the spices Board of India. All of these are based on the findings which are analyzed, without preconceived notions and authors’ subjective remarks. Recommendations for Practitioners............................................................................................................................................................. This paper reveals the view and understandings of the practitioners in the Indian Cardamom sector. It subtly suggests a certain course of action and serous recognition of flaws and deficiencies in the system that are obvious and emerges and which are critical and must be addressed. It underlines needs to be addressed; flaws in performance, and articulates the grievances. Recommendation for Researchers................................................................................................................................................................. More work needs to be done to have a clear analysis of the market demand of the cardamom products in order to project periods when demands of cardamom fluctuate the market, both domestically and internationally. In addition, it is important to study the various organic methods, which can be adopted by the farmers to produce high quality cardamom, which can meet the demand of the consumer as well as the standard required by various governments around the globe. Impact on Society........................................................................................................................................................................................... It reflects clearly, the general and prevalent concern of the Indian farming community and market intermediaries’ vis-à-vis the promotional role they expect the Spices Board of India to play in order to ameliorate the gravity of the bottlenecks being faced by the Indian Cardamom sector. Future Research................................................................................................................................................................................................ There are many areas to be studied in the Indian Cardamom Industry. This research paper attempts to highlight the unmitigated problems faced by the various strata of farmers, the indispensability of going “Organic”, and the need for the intervention of the Spices Board of India, and other relevant State Agri-Horticultural agencies, marketing Co-operative societies; subsidies and grants to be given by the government to encourage both organic cultivation and value addition using Carbon dioxide extraction of Oleoresins, packing, export market research, etc.
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Johan, Prisca Divra, Osumanu Haruna Ahmed, Ali Maru, Latifah Omar, and Nur Aainaa Hasbullah. "Optimisation of Charcoal and Sago (Metroxylon sagu) Bark Ash to Improve Phosphorus Availability in Acidic Soils." Agronomy 11, no. 9 (September 8, 2021): 1803. http://dx.doi.org/10.3390/agronomy11091803.
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Soil acidity is an important soil factor affecting crop growth and development. This ultimately limits crop productivity and the profitability of farmers. Soil acidity increases the toxicity of Al, Fe, H, and Mn. The abundance of Al and Fe ions in weathered soils has been implicated in P fixation. To date, limited research has attempted to unravel the use of charcoal with the incorporation of sago (Metroxylon sagu) bark ash to reduce P fixation. Therefore, an incubation study was conducted in the Soil Science Laboratory of Universiti Putra Malaysia Bintulu Sarawak Campus, Malaysia for 90 days to determine the optimum amounts of charcoal and sago bark ash that could be used to improve the P availability of a mineral acidic soil. Charcoal and sago bark ash rates varied by 25%, whereas Egypt rock phosphate (ERP) rate was fixed at 100% of the recommendation rate. Soil available P was determined using the Mehlich 1 method, soil total P was extracted using the aqua regia method, and inorganic P was fractionated using the sequential extraction method based on its relative solubility. Other selected soil chemical properties were determined using standard procedures. The results reveal that co-application of charcoal, regardless of rate, substantially increased soil total carbon. In addition, application of 75% sago bark ash increased soil pH and at the same time, it reduced exchangeable acidity, Al3+, and Fe2+. Additionally, amending acidic soils with both charcoal and sago bark ash positively enhanced the availability of K, Ca, Mg, and Na. Although there was no significant improvement in soil Mehlich-P with or without charcoal and sago bark ash, the application of these amendments altered inorganic P fractions in the soil. Calcium-bound phosphorus was more pronounced compared with Al-P and Fe-P for the soil with ERP, charcoal, and sago bark ash. The findings of this study suggest that as soil pH decreases, P fixation by Al and Fe can be minimised using charcoal and sago bark ash. This is because of the alkalinity of sago bark ash and the high affinity of charcoal for Al and Fe ions to impede Al and Fe hydrolysis to produce more H+. Thus, the optimum rates of charcoal and sago bark ash to increase P availability are 75% sago bark ash with 75%, 50%, and 25% charcoal because these rates significantly reduced soil exchangeable acidity, Al3+, and Fe2+.
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H. Basta, Altaf, Houssni El-Saied, and Emad M. Deffallah. "Optimising the process for production of high performance bagasse-based composites from rice bran-UF adhesive system." Pigment & Resin Technology 43, no. 4 (July 1, 2014): 212–18. http://dx.doi.org/10.1108/prt-08-2013-0077.
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Purpose – The purpose of this paper is to prepare high-performance agro-based composites from the non-toxic rice bran-urea-formaldehyde (RB-UF) adhesive system. Investigations have continued for production high performance agro-based composites using environmentally acceptable approaches. The utilisation of such system with the available used local agro-based wood products (sugar-cane bagasse, SCB) adds economic value and helps reducing the environmental impact of commercial urea-formaldehyde (UF) adhesive, and most importantly, provides a potentially inexpensive alternative to the existing commercial artificial wood-panel mills. Design/methodology/approach – Optimising the process for incorporating the RB in UF, as wood adhesive for binding the bagasse fibres, was carried out, by partially replacing commercial UF by denaturalised RB in slurry (wet) and dry form or through synthesis of UF. The denaturalisation of RB was carried out at different pHs (10-11) and at temperature 60°C for two hours. While incorporating the RB during synthesis of UF, it was carried out according to the method reported elsewhere. The formulation of adhesive components, pH value of the denaturalisation stage and the process of incorporating the RB were optimised. Assessment of the role of RB adhesive was specified from its free-formaldehyde (HCHO) content, as well as the properties (mechanical and physical properties) of the produced composites of bagasse particle board type, in comparison with the environmental impact of commercial thermosetting resin (UF). Findings – The promising adhesive system exhibits improvement in the environmental performance (as E1 type) over a commercially UF adhesive (as E2 type), besides providing boards fulfill the requirements of grade H-3 (according to ANSI A208.1 (NPA1993). This adhesive system was resulted from replacing 30 per cent of UF by denalturalised RB (at pH 10) in slurry form. Where, its reduction in free-HCHO reached 53 per cent, as well as modulus of rupture (MOR), modulus of elasticity (MOE), internal bond (IB) and TS of the produced boards were approximately 24.2 N/mm2, approximately 3753 N/mm2, approximately 0.84 N/mm2 and approximately 11.4 per cent, respectively. Research limitations/implications – The eco-adhesive with relatively high percentage of low-cost commercial UF (70 per cent) and 30 per cent RB, as oil production by-product, in slurry form provides good board strength and is environmentally friendly compared to SCB-based composite properties, with that produced from commercial UF. The mechanical (MOR, MOE and IB) and water-resistance properties of the produced composite comply with the standard values. Practical implications – The approach provided low HCHO-free UF adhesive with good comparative board strength and water resistance and reasonable working life. Replacing 30 per cent of UF by RB in slurry form and denaturalised at pH 10 is considered a promising inexpensive alternate adhesive (as E1) in the wood industry based on SCB wastes. Social implications – Incorporating the RB by-product of oil production to commercial UF will be beneficial for saving the health of wood co-workers and motivating the wood mill to export its wood products. Originality/value – It provided a potentially simple way to improve both the utilisation of commercial UF and SCB as industrial substrates for particle-board production. This will benefit farmers, local wood mills in Upper Egypt, significantly. Meanwhile, incorporating low percentage of RB, as oil-mill by-products, is promising to partly replace UF resin in the wood industry, minimising formaldehyde emission or toxic gasses during board formation.
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Ogeh, Joseph Sunday, and Rotimi Rofus Ipinmoroti. "Micronutrient Assessment of Cocoa, Kola, Cashew and Coffee Plantations for Sustainable Production at Uhonmora, Edo State, Nigeria." JOURNAL OF TROPICAL SOILS 18, no. 2 (June 10, 2013): 93. http://dx.doi.org/10.5400/jts.2013.v18i2.93-97.
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The micronutrient status of the soils and leaf of cocoa, kola, cashew and coffee plantations to study the soil-plant micronutrient content relationship in the plantation soils for proper management towards optimum production of the crops was investigated at Uhonmora, Edo State, Nigeria. Soil and leaf samples were collected from these plantations and analyzed according to standard laboratory procedures. The soil samples were analyzed for the micronutrients (Cu, Mn, Zn and Fe) and in addition pH, organic carbon, sand, silt and clay contents, while the leaves were analyzed for only the micronutrient contents. Results indicated that the soils were sandy loam, acidic, low in organic carbon, deficient in Cu and Mn but very high in Fe and Zn contents. This probably resulted in nutrient imbalance in the soils and the deficiency of the nutrients in the crops. The plantations therefore require application of organic manures and micronutrient fertilizers to rectify the inadequate soil organic matter and to supply sufficient amount of Cu and Mn in the soils, to obtain quality fruit yield at optimum level from the plantations.Keywords: Cashew, cocoa, coffee, kola, micronutrients, sustainable production [How to Cite: Ogeh JS and RR Ipinmoroti. 2013. Micronutrient Assessment of Cocoa, Kola, Cashew and Coffee Plantations for Sustainable Production at Uhonmora, Edo State, Nigeria. J Trop Soils 18 (2): 93-97. Doi: 10.5400/jts.2013.18.2.93] [Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.2.93] REFERENCESAdebiyi S, EO Uwagbue, EA Agbongiarhuoyi, I Ndagi and EO Aigbekaen. 2011. Assessment of agronomic practices among kola farmers in Osun State, Nigeria. World J Agric Sci 7: 400-403.Afolabi CA and NE Egbe. 1984. Yield response of kola to N, P and K fertilizer application: A case study of preliminary trial. Cafe Cacao The 28: 13-16. AOAC [Association of Official Analytical Chemists]. 1990. Official Methods of Analysis, 15th Edition. Washington DC: 774-784.Ayanlaja SA. 1983. Rehabilitation of cocoa (Theobroma cacao L.) in Nigeria: Major problem and possible solution. Plant Soil 73: 403-409.CBN [Central Bank of Nigeria]. 2010. Annual Report and Statement of Accounts for the year. Abuja, Nigeria. 182 p.Chude VO and GO Obigbesan. 1983. Safe and toxic application rates of boron for cocoa seedlings. Plant Soil 74: 145-147.Egbe NE, EA Ayodele and CR Obatolu. 1989. Soils and nutrition of cocoa, coffee, kola cashew and tea. Prog Tree Crop Res 2: 28-38.Falade JA. 1978. Cashew growing soil in Nigeria. East Afr Agric J 43: 100-105. FAO [Food and Agriculture Organization]. 2010. Food and Agriculture Organization of the United Nations. http://faostat.fao.org/site/567/DesktopDefault.aspx? PageID=567#ancor. Accessed on 21 January 2010.Ibiremo OS and O Fagbola. 2008. Effect of phosphorus fertilizer and arbuscular mycorhizal fungi inoculation on the growth of cashew seedlings in two soils in Nigeria. Nigerian J Soil Sci 18: 138-146.Ipinmoroti RR, OSO Akanbi, MA Daniel, LA Adebowale, GA Adewoye, EA Makinde and CO Kayode. 2011. Potentials of NPK and organic fertilizers on growth performance of cashew (Anacardium occidentale L.) seedlings on degraded typic alfisol soils in Ibadan, Nigeria. J Agric Sci Tech 1: 876-881.Ipinmoroti RR, P Aikpokpodion and OSO Akanbi. 2009. Nutritional assessment of cocoa plots for soil fertility management on some cocoa farms in Nigeria. Proceedings of 16th International Cocoa Research Conference Held at Grand Hyatt Hotel, Nusa Dua, Bali, Indonesia, pp 1481-1485.Iremiren GO and AM Ekhomun. 2005. Effects of N fertilizer rates on the performance of maize-okra mixture in an acid sand soil of the Nigerian forest zone. Nigerian J Appl Sci 23: 11-14. McKenzie RH. 2001. Micronutrient requirements of crops. Alberta Agriculture and Rural development http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex713. Acessed on 21 July 2011.Nelson DW and LE Sommers. 1982. Organic carbon and soil extracts In: D L Sparks (ed). Methods of soil Analysis. Part 2- Chemical and microbiological properties. Agronomy Monograph No.9, 2nd Edition. American Society of Agronomy, Soil Science Society of America, Madison, WI, USA, pp. 539-579.Ogunlade MO, OS Ibiremo, RR Ipinmoroti, CI Iloyanomon and PE Aikpokpodion. 2011. Determination of phosphorus and potassium fixation capacities and fertilizer fctors in soils of three cocoa growing areas of Nigeria. J Soil Nat 5: 11-16.Ogunmoyela OA and CR Obatolu. 1984. Nutrient studies and fertilizer requirements of Nigeria tea. Cafe Cacao The 28: 179-184.Ogunwale JA, JO Olaniyan and MO Aduloju. 2002. Morphological, physico-chemical and clay mineralogical properties of soils overlaying basement complex rocks in Ilorin East, Nigeria. Moor J Agric Res 3: 147-154.Ojeniyi SO. 1980. Nutrient studies of NPK treated coffee plots. Plant Soil 56: 175-179.Omotoso TI. 1974. The effect of fertilizer and irrigation on the leaf macronutrient composition of Coffea canephora during a year. Turrialba 24: 315-318.Opeke LK. 1987. Tropical tree crops. Spectrum Books Limited, Ibadan, Nigeria, p 247.Wood GAR and RA Lass. 1985. Cocoa, 4th ed. London: Longman, pp. 620-632.
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M. Amin, Sri Yulis, Norhamidi Muhamad, and Khairur Rijal Jamaludin. "Optimization of Injection Molding Parameters for WC-Co Feedstocks." Jurnal Teknologi 63, no. 1 (July 11, 2013). http://dx.doi.org/10.11113/jt.v63.1454.
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This study investigates the effect of injection molding parameters on the density of green body of cemented carbide (WC-Co) – based powder injection molding (PIM) feedstock. Experiments were conducted with ball-milled WC-Co powder mixed with a palm stearin and polyethylene binder system. To minimize the test run while maintaining the quality standard of data measurement, design of experiment approach, particularly Taguchi Method with L18 orthogonal array was used in the present study. Several parameters were considered, namely, powder loading, injection temperature, holding pressure and injection rate, while density of the green body as the response factor. The results show the optimum combination of injection factor that produces the best green density value, which eventually will leads to higher density for sintered parts.
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Asodina, Francis Akabo, Faizal Adams, Fred Nimoh, Emmanuel A. Weyori, Camillus Abawiera Wongnaa, and John Edudes-Andvi Bakang. "Are non-market benefits of soybean production significant? An extended economic analysis of smallholder soybean farming in Upper West region of northern Ghana." Agriculture & Food Security 9, no. 1 (November 11, 2020). http://dx.doi.org/10.1186/s40066-020-00265-7.
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Abstract Background Traditional cost–benefit analysis of soybean production tends to largely focus on financial benefits to farmers, and less so on non-market co-benefits in sustaining smallholder farming systems. Relying solely on the standard financial analysis undermines the actual benefit of soybean production, which often results in ineffectual policy designs. An economic analysis that incorporates key non-pecuniary co-benefits of soybean production provide vital insight that contributes to improving productivity and overall economic well-being of farmers. Cross-sectional data were collected from 271 farmers to estimate the overall economic benefit of soybean that captures both market and non-market attributes in three major producing districts (Sissala-West, Wa-East, and Dafiama-Busie-Issa (DBI)) of Ghana. Results When non-market co-benefits were omitted, soybean production was not profitable (−Gh¢103.10/ha or −US$22.91) in DBI while Sissala-West and Wa-East had modest profit margins. However, the financial analysis changed dramatically when an average non-market value of Gh¢345.69 (US$76.82) was incorporated in the analysis. The soybean system was, therefore, financially viable for all the districts when the non-market attributes of the crop were considered. Conclusions The findings demonstrate the importance of the non-pecuniary benefits of soybean in smallholder farming systems for policy decision-making. For instance, farmers’ motivation for soybean production is closely linked to those ancillary benefits like the biological nitrogen fixed in the soil for cultivation of other crops. Similarly, crop administrators and policy makers’ support for conservation agriculture and green environment is tied to these non-market co-benefits.