Academic literature on the topic 'Sucker investigation'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Sucker investigation.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Sucker investigation"
1
Hossaina, Foysal, Tatia Biswasb, M. Ashraful Islama, Nusrat Jahana, and Md Mokter Hossaina. "EFFECT OF AGE OF SUCKERS AND BUNCH COVERING ON YIELD AND QUALITY ATTRIBUTES OF BANANA CV. AMRITSAGAR." Agriculture Extension in Developing Countries 02, no. 02 (2024): 92–99. https://doi.org/10.26480/aedc.02.2024.92.99.
Full textAbstract:
The investigation was carried out at the Horticulture farm of Bangladesh Agricultural University, Mymensingh during the period from April to October, 2019. The experiment was conducted in Randomized Complete Block Design (RCBD) with two factors and five replications. Factor A was different aged suckers namely A1= 1st year sucker, A2= 2nd year sucker and A3= 3rd year sucker. Factor B was different types of bagging like B1= Black, B2= White, B3= Blue and B4= Control. Five fingers were randomly selected from each hand and were analyzed for different parameters. The result of the experiment showed that all the parameters were studied found significantly different among the treatments. Among the effect of sucker age, the highest plant height (301cm), plant diameter (74.4 cm), number of fingers per bunch (55.1), bunch weight per plant (13.15 kg), weight all hands per bunch (11.79 kg), weight of single finger at ripening time (145.4 g) were found from A3 (3rd year sucker ). Also, the highest weight of single pulp at ripening time (107.3 g), weight of single peel at ripening time (38.0 g), TSS (20.05 %), moisture content of pulp (78.4 %), dry weight of peel (5.36 g) and moisture content of peel (85.76%) was found from A3 (3rd year sucker). On the other hand, among the effect of bagging, the highest growth and yield like fingers per bunch (57.47), bunch weight per plant (12.83 kg), weight all hands per bunch (11.42 kg) were found in B2 (white polythene). Also, the highest weight of single finger at harvesting time (157 g), weight of single finger at ripening time (137.3 g), weight of pulp at ripening time (102.3 g), moisture content of pulp (78.77%), moisture content of peel (85.41%) were found from B2 (white polythene). The combined effect of sucker age and bagging materials, the highest growth and yield like length of bunch (76.2cm), bunch weight per plant (14.58kg), weight all hands per bunch (13.04 kg) was found in A3B2 (3rd year sucker with white polythene). In a nutshell, the present study showed that different aged suckers and bunch covering had a better effect on physio-morphological characteristics, yield and quality.
2
Ilqar Ahmadov, Sabina Tagiyeva, Ilqar Ahmadov, Sabina Tagiyeva, and Samira Mansurova Samira Mansurova. "INVESTIGATION OF THE INFLUENCE OF THE LOWERING DEPTH OF DOWNHOLE SUCKER-ROD PUMPS ON THE DELIVERY FACTOR." ETM - Equipment, Technologies, Materials 12, no. 04 (2022): 52–59. http://dx.doi.org/10.36962/etm12042022-52.
Full textAbstract:
It is well known that, at present, late stage fields are operated mainly by sucker-rod pumps. The pumps are usually operated in rather complicated technological and hydrodynamic conditions, strongly influencing its efficiency. In the article the possible influence of downhole sucker-rod pump (DSRP) depth on delivery factor that is one of the indicators of operating efficiency of the entire sucker-rod pumping unit is investigated on the basis of actual field information. The values of oil and water delivery coefficients were calculated and functional dependence on the depth of sucker-rod pump immersion was built. The results showed an increase in the oil supply coefficient and a decrease in its water supply coefficient in the considered ranges of values. Mathematical models of the dependencies were also obtained. As a result of the conducted research, the expediency of the controlled increase of the depth of suspension of pumps in the conditions of operation of the considered field is confirmed. Keywords: down-hole sucker-rod pump, delivery ratio, well operation, pump parameters, depth of pump suspension
3
Svyantek, Andrej, Bülent Köse, John Stenger, Collin Auwarter, and Harlene Hatterman-Valenti. "Cold-Hardy Grape Cultivar Winter Injury and Trunk Re-Establishment Following Severe Weather Events in North Dakota." Horticulturae 6, no. 4 (2020): 75. http://dx.doi.org/10.3390/horticulturae6040075.
Full textAbstract:
Extreme winter temperatures during the 2018–2019 dormant season contributed to trunk collapse and complete trunk death of numerous genotypes throughout a diverse grapevine planting in eastern North Dakota, USA. Through the early portion of the dormant season, 12 genotypes were screened to identify lethal temperature exotherms of primary buds; from these results, none were anticipated to be fully prepared to survive the −37 °C minimum temperature recorded in the region. Trunk collapse, death, and survival were monitored for 35 replicated genotypes. New trunks were retrained from suckers and monitored for growth following trunk removal. Only five genotypes exceeded 50% trunk survival at the end of the 2019 growing season, ‘Valiant’, ‘King of the North’, ‘John Viola’, ‘Baltica’, and ‘Bluebell’. Following re-establishment, ‘La Crescent’ was the most vigorous genotype with the largest sucker circumference, sucker length, and internode length. Nearly all genotypes evaluated produced suckers with lengths approaching the high-wire trellis height (1.8 m), designating their potential for cordon retraining in 2020. Cumulatively, however, the lethal temperature exotherm results and the trunk survival examination indicate a harrowing need for investigation of new management practices (such as protected training systems) and the generation of new cold-hardy genotypes to enhance productivity under standard unprotected systems.
4
Maleyka Mammadova, Hasan Hasanov, Maleyka Mammadova, Hasan Hasanov. "INCREASING THE WORKING CAPACITY OF THE SUCKER ROD PUMP." ETM - Equipment, Technologies, Materials 21, no. 03 (2024): 89–94. http://dx.doi.org/10.36962/etm21032024-14.
Full textAbstract:
The downhole pressure in many oil reservoirs across the world is insufficient to force the created fumes to the surface. Pumps are utilized to artificially lift the fluids in order to manufacture these fluids. Artificial lift techniques are used to generate oil from more than 70% of all active wells. Sucker rod pumps are among the most often used artificial lift techniques. As a well-respected technology in the oil and gas sector, sucker rod pumps are inexpensive to buy and operate, simple to use, and widely available. Numerous technological developments have been used to enhance the performance, applicability, and diagnostics of sucker rod pumps. With these developments, it's critical to be able to consistently offer an updated assessment and usage manual for the sucker rod-operated pumps. This study offers a current, thorough analysis of the parts of sucker rod pumps, diagnostic techniques, mathematical models, and typical field failures along with advice on how to reduce and prevent them. A new classification of all techniques that may be included in the sucker rod pump technology has been created, based on the review that was done and the newly released sucker rod pump techniques in the industry. This study also discusses a number of field case studies from wells all around the world to highlight some of the key characteristics of sucker rod pumps. Lastly, based on the revised evaluation, the benefits and drawbacks of sucker rod pumps are discussed. The results of this investigation can contribute to a deeper comprehension of the various sucker rod pumps and offer a comprehensive perspective on the sucker rod pump, including its characteristics and modeling. Keywords: sucker rod pumps, failures of sucker rods and their remedies, structure optimization.
5
Tamilla Khankishiyeva, Tamilla Khankishiyeva, and Vuqar Ashiraliyev Vuqar Ashiraliyev. "INVESTIGATION AND RELIABILITY IMPROVEMENT OF ROD DOWNHOLE PUMP VALVE ASSEMBLY." ETM - Equipment, Technologies, Materials 13, no. 01 (2023): 83–91. http://dx.doi.org/10.36962/etm13012023-83.
Full textAbstract:
The purpose of the work: modernization of the valve, in order to increase reliability, wear resistance, increase the pump flow and reduce the load on the rod string. As well as improved durability. Object of work: Rod pump valve. Realization of the goal is achieved by performing the following tasks: 1. Overview of known designs of the valve assembly of a sucker rod pump; 2. Identification of a number of causes of valve failure, as well as its causes of wear; 3. Calculation of the main parameters of the pump; 4. Overview of the design of a sucker rod pump, to understand the problem; 5. Development of measures for the maintenance and repair of the pump. In the course of the WRC, a review and analysis of information on the designs of the valve assembly of a borehole rod pump was carried out. The problem of its wear has been studied. The problem of valve design is formulated and solved. At the moment, sucker rod pumps (SRP) and electric submersible pumps (ESPs) are used. Since the ESP has much higher production capabilities compared to the rod, the main volume of oil in the country is produced using ESP units. In view of the fact that the simplicity of the design of the SRPU is the most maintainable during practical operation, it is precisely such installations that are used at the moment. And also the positive aspects of the SRPU are the convenience of its adjustment, the small effect on the operation of the SRPU of the physical and chemical properties of the pumped liquid, the relatively high efficiency and the possibility of operating wells of small diameters, compared with other installations and methods of operation. However, SRPU oil production is based on relatively old oil production technology and techniques, especially for downhole and downhole equipment and technological operations carried out using this equipment. The development, manufacture and testing of new equipment is becoming especially relevant. The purpose of my project is to increase the filling factor of a sucker rod pump, as well as to increase the reliability of its operation after repairs. An increase in the filling ratio of the SRP is achieved by upgrading the valve assembly, and an increase in reliability. Keywords: sucker rod pump, valve part, abrasion, reliability, downhole pump, suction valve, discharge valve.
6
Day, Julie L., Jennifer L. Jacobs, and Josh Rasmussen. "Considerations for the Propagation and Conservation of Endangered Lake Suckers of the Western United States." Journal of Fish and Wildlife Management 8, no. 1 (2017): 301–12. http://dx.doi.org/10.3996/022016-jfwm-011.
Full textAbstract:
Abstract Decades of persistent natural and anthropogenic threats coupled with competing water needs have compromised numerous species of freshwater fishes, many of which are now artificially propagated in hatcheries. Low survival upon release is common, particularly in systems with substantial nonnative predator populations. Extensive sampling for Shortnose (Chasmistes brevirostris) and Lost River Suckers (Deltistes luxatus) in the Klamath River Basin on the California–Oregon border have failed to detect any new adult recruitment for at least two decades, prompting an investigation into artificial propagation as an extinction prevention measure. A comprehensive assessment of strategies and successes associated with propagation for conservation restocking has not been performed for any Catostomid. Here, we review available literature for all western lake sucker species to inform propagation and recovery efforts for Klamath suckers and summarize the relevance of these considerations to other endangered fishes.
7
Doherty, Chad A., Brendan Galloway, R. Allen Curry, and Kelly R. Munkittrick. "Performance of White Sucker Populations along the Saint John River Main Stem, New Brunswick, Canada: An Example of Effects-Based Cumulative Effects Assessment." Water Quality Research Journal 40, no. 3 (2005): 361–73. http://dx.doi.org/10.2166/wqrj.2005.040.
Full textAbstract:
Abstract White sucker (Catostomus commersoni) are widely distributed in North America and are often used in environmental monitoring. Whole organism characteristics of three white sucker populations determined to be resident (outside of spawning) within small sections of the Saint John River, New Brunswick, were studied in 2001 and 2002. Significant differences in performance characteristics were present among sites. The differences can be interpreted as either improved sucker performance at Florenceville (upstream site), or decreased performance at Woodstock. Without further investigation it is difficult to identify whether the apparent improved performance is a response to nutrient enrichment, or increased mortality associated with the recent prevalence of lesions. Confounding factors are also present. Daily water level fluctuations resulting from an upstream dam discharge may change habitat availability and/or diversity, thereby altering the fish community. Liver sizes in Saint John River white sucker are considerably larger than in fish collected in Ontario, but are not relative to nearby New Brunswick river populations. This has implications for the importance of reference site selection and understanding the natural variability within a species (intra-specific variation) on multiple spatial scales.
8
Xankishiyeva, T. "INVESTIGATION OF THE DEPENDENCE OF DEFORMATION OF WELL SEAl OF A WIRE ROD PUMP." Sciences of Europe, no. 127 (October 25, 2023): 97–101. https://doi.org/10.5281/zenodo.10039436.
Full textAbstract:
The article considers the research of dependencies sealing force-deformation for various forms of wellhead seals with rectangular cross-section and with the conical edge downhole sucker rod pump. Determined the dependence of the optimal force - deformation of the omental element with methods variation.
9
Neeraj, Kumar, Bajaj Rachana, and Soni Kapil. "Pushover Analysis of Reinforced Concrete Structure Using Staad Pro." Journal of Earthquake Science and Soil Dynamics Engineering 2, no. 2 (2019): 1–9. https://doi.org/10.5281/zenodo.3383409.
Full textAbstract:
With the gigantic death toll and property saw over the most recent few decades alone in India, because of disappointment of structures brought about by tremors, consideration is presently being given to the assessment of the sufficiency of solidarity in encircled RC structures to oppose solid ground movements. A 50-year old four story (8-sound and 3-outline) strengthened solid structure has been considered in this examination, which lies in Zone II, as indicated by IS 1893:2000 characterization of seismic zones in India. Brick work infills have been considered as non-basic individuals during this whole investigation. Inelastic static examination, or sucker investigation, has been the favored strategy for seismic execution assessment because of its straightforwardness. It is a static examination that straightforwardly consolidates nonlinear material attributes. Inelastic static investigation systems incorporate Capacity Spectrum Method, Displacement Coefficient Method and the Secant Method. The structure has been assessed utilizing Pushover Analysis, a non-direct static method, which might be considered as a progression of static examination did to build up a weakling bend for the structure. The structure is re-enacted in SeismoStruct Version 5.2.2 in the wake of being planned in STAAD. Pro v8i by considering M20 cement and Fe415 steel support. The sucker bend is produced by pushing the top hub of structure to the constraining relocation and setting proper execution criteria. The objective relocation for the structure is inferred by bi-linearization of the acquired sucker bend and consequent utilization of Displacement Coefficient Method as per ASCE 41-06. The investigation is then done for 150% of the determined objective dislodging for the structure to watch the yielding of the individuals and the sufficiency of the basic quality. The degree of harm experienced by the structure at the objective dislodging is viewed as portrayal of the harm that would be experienced by the structure when exposed to configuration level ground shaking.
10
Ganiev, A. M., V. D. Gadzhiev, M. D. Shlyakhovskii, and �. R. Allakhverdov. "Investigation of accuracy in automated production of sucker rod pump couplings." Chemical and Petroleum Engineering 26, no. 12 (1990): 635–36. http://dx.doi.org/10.1007/bf01147551.
Full textDissertations / Theses on the topic "Sucker investigation"
1
Cole, David. "Ecomorphological and Genetic Investigations into the Utah Lake, UT Sucker Complex with Comparisons to the Jackson Lake, WY Sucker Complex." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/2122.
Full textAbstract:
Ecomorphological specialization within Catostomidae in several large western North American lakes has produced populations including typical benthic suckers (Catostomus) and lakesuckers (Chasmistes), mid-water planktivores, with a continuum of morphologies existing between them. All extant lakesuckers are endangered, and population declines have been attributed in part to hybridization with sympatric Catostomus spp. Chapter 2 describes assessment for concordance of morphological and genetic variation in suckers in Utah Lake, Utah (June sucker, Chasmistes liorus; Utah sucker, Catostomus ardens; and suckers of intermediate morphology) by comparing a morphological analysis with amplified fragment length polymorphism and microsatellite analyses. Suckers were differentiated using characters associated with presumed feeding strategies: zooplanktivory (June sucker) and benthivory (Utah sucker). No molecular evidence was found for deep genetic divergence between morphs or for hybridization among ancient lineages. Slight population structuring accompanied substantial morphological variation. Chapter 3 describes the investigation of distribution and movement, spawning behavior, and diet of suckers in Utah Lake and their growth at different densities in a laboratory experiment. Acoustic / radio telemetry revealed little difference in movement and distribution of June sucker and Utah sucker or in timing of spawning runs. Stable isotopes analysis revealed that Utah sucker were enriched in 13C relative to June sucker as presumed diets would predict. Intermediate morphs were intermediate for δ13C and δ15N. Neither species nor density was a significant predictor of growth rate of June sucker or Utah sucker reared at different conspecific densities. Chapter 4 examines morphology, genetics, and diet of the sucker population inJackson Lake, Wyoming, once home of the extinct Snake River sucker, Chasmistes muriei, a lakesucker known from a single specimen. Currently, suckers in Jackson Lake are identified as Utah sucker; however, recently sampled individuals resemble lakesucker. No molecular evidence was found for deep genetic divergence between lakesucker and benthic morphs or for hybridization among ancient lineages. The benthic morph was significantly enriched in 13C relative to the lakesucker morph, consistent with presumed diets. Morphologically, the lone Snake River sucker holotype specimen grouped strongly with extant lakesucker morphs, suggesting that the status of the Snake River sucker be updated accordingly.
2
Lerbret, Adrien. "Etude de l'action bioprotectrice des sucres : une investigation par dynamique moléculaire et spectroscopie Raman." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2005. http://tel.archives-ouvertes.fr/tel-00011225.
Full textAbstract:
La compréhension de la plus grande stabilisation des molécules biologiques par un disaccharide<br />tel que le tréhalose par rapport à d'autres excipients fait l'objet de recherches accrues. Nous<br />avons étudié l'influence du tréhalose et de deux autres stéréoisomères, le maltose et le sucrose,<br />sur la structure et sur la dynamique de l'eau et d'une protéine globulaire modèle, le lysozyme. Nous<br />avons montré que le tréhalose induit une plus grande déstructuration du réseau de liaisons hydrogène (LHs)<br />de l'eau que le maltose et le sucrose, au-delà d'une concentration de 40-50 %, à laquelle le réseau<br />de LHs des sucres percole. En outre, le nombre d'hydratation des sucres et le<br />nombre de LHs sucre-sucre suggèrent que les solutions aqueuses de tréhalose sont plus "homogènes",<br />pour des concentrations entre 33 et 66 % pds. Nous avons également localisé les zones<br />d'interaction des sucres avec le lysozyme et montré par spectroscopie Raman que le tréhalose le stabilise<br />davantage.
3
Lerbret, Adrien Descamps Marc Hedoux Alain. "Etude de l'action bioprotectrice des sucres une investigation par dynamique moléculaire et spectroscopie Raman /." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/569.
Full textAbstract:
Reproduction de : Thèse de doctorat : Sciences des matériaux : Lille 1 : 2005.<br>N° d'ordre (Lille 1) : 3705. Résumé en français et en anglais. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 167-175.
4
Mastouri, Amira. "Etude des phénomènes de reconnaissance moléculaire spécifique aux interfaces biologiques par AFM : investigation de l'influence de la multivalence sur les interactions sucre-lectine." Phd thesis, Université de Technologie de Compiègne, 2013. http://tel.archives-ouvertes.fr/tel-01067126.
Full textAbstract:
Le présent projet vise à analyser l'influence de la multivalence dans les interactions sucres-lectines. En collaboration avec des équipes externes, une étude par microscopie à force atomique (AFM) de l'interaction entre des ligands synthétiques de différentes valences et leurs lectines spécifiques a été entreprise. Dans le cadre de cette étude, une première caractérisation fondamentale de l'interaction sucre-lectine a été menée. Cette caractérisation concerne plus particulièrement l'influence de la multivalence sur les forces d'adhésion et la dynamique de l'interaction entre les ligands synthétiques multivalents et une lectine modèle, la lectine d'arachide PNA. Une seconde caractérisation, d'aspect plus appliqué, concerne l'utilisation des ligands synthétiques multivalents dans une approche thérapeutique antiadhésive pour le traitement des infections urinaires chroniques dues à Escherichia coli uropathogène (UPEC). Le caractère innovant des ligands (obtenus par une synthèse chimique rationnelle) ainsi que l'approche utilisée pour caractériser leurs interactions avec les lectines à l'échelle moléculaire par AFM témoigne de l'originalité du projet.
5
Le, Tuan. "Investigation of physical mechanisms during deconstruction of pretreated lignocellulosic matrix and its ability to liberate a fermentable carbon substrate in a bio-process." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30133/document.
Full textAbstract:
La biomasse lignocellulosique comprend les sous-produits agricoles et industriels pouvant être utilisés comme matière première dans des bioprocédés variés destinés à produire des molécules d'intérêt énergétique ou chimique. Ces ressources lignocellulosiques, peuvent notamment être fournies par l'industrie papetière qui est particulièrement adaptée pour les bio-raffineries modernes car elle est en capacité de produire en grande quantité un substrat ayant une faible teneur en lignine et sans composés inhibiteurs. La bagasse de canne à sucre est également un substrat prometteur par sa composition chimique simple et son abondance dans les pays tropicaux. Lors de l'utilisation de ces substrats, l'hydrolyse enzymatique constitue une étape cruciale permettant la transformation des fibres de cellulose en une source de carbone fermentescible. Si les aspects biochimiques de cette étape d'hydrolyse font l'objet de nombreuses recherches et de développements, les réactions sous haute teneur en matière sèche font apparaître des limitations physiques qui sont beaucoup moins étudiées et analysées mais constituent des verrous scientifiques et technologiques qui freinent actuellement l'utilisation de cette ressource abondante et durable. Ce travail s'inscrit dans ce contexte et propose l'étude de cette étape d'hydrolyse enzymatique de la lignocellulose en s'intéressant conjointement aux aspects biochimiques et physiques de façon à aller vers une compréhension et une maîtrise des transferts (de masse, de chaleur) dans les réactions à forte concentration en substrat. La stratégie adoptée a consisté à réaliser et analyser des réactions d'hydrolyse sous différentes conditions opératoires en travaillant dans un premier temps sur des concentrations intermédiaires (suspension semi-diluée), c'est-à-dire en introduisant, mais de façon limitée, les complexités dues aux interactions entre particules/fibres de lignocellulose. Les résultats obtenus sont ensuite utilisés pour élaborer une stratégie adaptée aux fortes concentrations. Les aspects physiques analysés sont essentiellement le comportement rhéologique du milieu réactionnel ainsi que la morpho-granulométrie des objets en suspension. Différentes métrologies, tant in-situ que ex-situ, ont été mises en œuvre et apportent des résultats complémentaires. Les études ont été menées sur un substrat de référence, le papier Whatman, et deux substrats à vocation industrielle: la pâte à papier et la bagasse de canne à sucre. La stratégie d'étude porte sur les aspects suivants: (i) le suivi de l'évolution des comportements rhéologiques et des propriétés morphologiques des suspensions au cours de l'hydrolyse, (ii) l'étude des mécanismes d'hydrolyse lors de la dégradation des substrats, (iii) l'étude de l'impact de la composition et de la structure des substrats sur les cinétiques de solubilisation et d'hydrolyse, (iv) la quantification de la contribution des différentes activités enzymatiques, seules ou en mélange par une approche physique multi-échelle et (v) le contrôle et l'optimisation des conditions d'alimentation dans un procédé discontinu alimenté (fed-batch) afin d'atteindre des conditions de milieu concentré. Les chapitres 1 et 2 de ce document sont consacrés à une étude bibliographique du sujet et à la présentation des matériels et méthodes mis en œuvre. Le troisième chapitre présente les résultats obtenus et leur analyse. Il est constitué de trois sections: tout d'abord une étude des propriétés des différents enzymes ou cocktail d'enzymes utilisés, des substrats retenus et des suspensions avec, notamment, la détermination des régimes semi-dilués et concentrés. Ensuite sont présentées et analysées les hydrolyses effectuées en milieu semi-dilué. Les mécanismes d'hydrolyse (fragmentation, solubilisation, hydratation et séparation des agglomérats) sont étudiés pour diverses concentrations et divers enzymes/cocktails. Enfin les résultats en milieu concentré sont présentés dans une dernière section<br>Lignocellulosic biomass consists of several agriculture and industrial by-products that can be used as raw material for several bioprocesses to obtain range of products. Among lignocellulosic sources, the pulp & paper industry is appropriated for modern bio-refining thank to pulp with low lignin content and free of inhibitory compounds. Besides, sugarcane bagasse is a very promising feedstock because of its simple chemical composition and its abundancy especially in tropical countries. In the bioconversion of lignocellulose, enzymatic hydrolysis is a crucial step that allows the transformation of cellulosic and hemicellulosic fibers into fermentable carbon sources. The lack of knowledge about physical limitations and hydrolysis mechanisms, especially at high dry matter content, stands as the main barrier which forbids the scale-up of bio-refinery processes. Thus, the efficient and sustainable use of lignocellulosic resources is currently a major challenge and need to be investigated. In this context, this PhD focused on the enzymatic hydrolysis of lignocellulose by both physical and biochemical approaches. The strategy consisted in carrying out and in analyzing the hydrolysis reactions under different operating conditions with semi-dilute suspensions. Then, obtained results were used to develop a hydrolysis strategy for concentrated suspensions. Different methodologies, in- and ex-situ analyses, were implemented and provided complementary results. From physical approach, analyses consisted in rheological behavior of suspensions as well as the morpho-granulometry of particles. The study was carried out on a reference substrate, Whatman paper, and on two industrial substrates, paper pulp and sugarcane bagasse. The strategy aimed to investigate different stakes: (i) evolution of rheological behaviors and the morphological properties of suspensions, (ii) hydrolysis mechanisms during the degradation of substrates, (iii) impact of substrate composition and structure on solubilization and hydrolysis kinetics, (iv) quantification of the contribution of single enzyme and enzyme mixture activities by multi-scale physical approaches and (v) control and optimization of feeding parameters for fed-batch process in order to access to concentrated suspension. Chapters 1 and 2 of this document are devoted to a research bibliographic and presentation of materials and methods. The third chapter presents obtained results and discussion in three sections. The first one is a study of the properties of different enzymes and substrates, in particular, the determination of semi-dilute and concentrated regime. Subsequently the enzymatic hydrolysis at semi-dilute regime is presented to highlight the hydrolysis mechanisms (fragmentation, solubilization, solvation and agglomerate separation) in relationship with enzyme mixtures and dosages. Finally, results in concentrated regime are discussed in the final section
Books on the topic "Sucker investigation"
1
Chart, Thomas E. Investigation of potential razorback sucker (Xyrauchen texanus) and Colorado pikeminnow (Ptychocheilus lucius) spawning in the lower Green River, 1994 and 1995: Final report. Utah Division of Wildlife Resources, Moab Native Fises Field Office, 1999.
Find full text
2
Scheerer, Paul D. Warner Valley fish investigations: Warner suckers. Fish Division, Oregon Dept. of Fish & Wildlife, 2006.
Find full text
3
J, Wick Edmund, Recovery Program for Endangered Fish of the Upper Colorado River Basin, and U.S. Fish and Wildlife Service, eds. Investigations of razorback sucker distribution, movements and habitats used during Spring in the Green River, Utah: Final report. U.S. Fish and Wildlife Service, 1997.
Find full text
6
Berry, Tamara. Séances Are for Suckers. Highbridge Audio and Blackstone Publishing, 2021.
Find full text
8
Pritchard, Kev, Allison Jones, and David Clemson. suckey Using Math To Solve A Crime (Mathworks). Gareth Stevens Publishing, 2004.
Find full text
9
Grant, Tom, and Illustrations by Dominic Fanning. Platypus. CSIRO Publishing, 2007. http://dx.doi.org/10.1071/9780643101272.
Full textAbstract:
Since it first became known to European scientists and naturalists in 1798, the platypus has been the subject of controversy, interest and absolute wonder. Found only in Australia, the platypus is a mammal that lays eggs but, like other mammals, it has fur and suckles its young on milk. Many early biologists who visited the British colonies in Australia, including Charles Darwin, went out of their way to observe this remarkable animal. In Australia today the species is considered to be an icon, but one that many Australians have never seen in the wild.
 This book presents established factual information about the platypus and examines the most recent research findings, along with some of the colourful history of the investigation of its biology. This completely updated edition covers its anatomy, distribution and abundance, breeding, production of venom, unique senses, ecology, ancestry and conservation. It includes a 'Frequently Asked Questions' section for the general reader and, for those wishing to find out more detailed information, a comprehensive reference list.
Book chapters on the topic "Sucker investigation"
1
Methel, Jeanne, Maxime Forte, Olivier Vermeersch, and Grégoire Casalis. "An Experimental Investigation of the Effects of Wires and Forward-Facing Steps on the Laminar-Turbulent Transition of a Sucked Boundary Layer." In IUTAM Laminar-Turbulent Transition. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67902-6_18.
Full text
2
Ureta Reina, Gregoria Jesús. "Capítulo 14: Crisis política, jurídica y precariedad en la salud pública en epidemia del dengue en Perú." In Gestión del conocimiento. Perspectiva multidisciplinaria (libro 59). Fondo Editorial de la Universidad Nacional Experimental Sur del Lago, Jesús María Semprum (UNESUR), 2023. http://dx.doi.org/10.59899/ges-cono-59-c14.
Full textAbstract:
La presente investigación analizo el nivel de escritura científica para constatar si los estudiantes de la Universidad Laica Eloy Alfaro de Manabí -Extensión Sucre desde los proceso metodológicos han marcado trayectoria eficiente en los últimos años producción científica que les servido en su trayectoria académica para su futuro profesional El tipo de investigación fue descriptiva, se utilizó e método cuantitativo y cualitativo , además se aplicó el método Delphi desde la óptica de los expertos se aplicó la técnica de la encuesta se realizó de manera aleatoria , lo más preponderante de la investigación fue constatar las nuevas estrategias que se están utilizando en la Universidad es dar posibilidades de nuevas modalidades a la carrera de marketing optar por un artículo científico dentro de su proceso de formativo, es decir escoger para graduarse, trabajar en artículos cuenticos con temas que se desarrollan en los macroproctos , esto permite que desde la catedra de metodología investigativa ponga en práctica la realización de artículos científicos animando a los estudiantes participar en eventos científicos, como jornadas sean estas internas , externa y a nivel internacional creando en los estudiantes socializar el conocimiento desde los problemas de su entorno, creando un nuevo modelo investigativo.
3
Ramírez Giraldo, Andrés, and Katy Arroyo Alvis. "UNA MIRADA INVESTIGATIVA EN SUCRE SOBRE LA VULNERABILIDAD DESDE EL DESARROLLO CEREBRAL." In Psicología y vulnerabilidad. CORPORACIÓN UNIVERSITARIA DEL CARIBE CECAR, 2020. http://dx.doi.org/10.21892/9789588557755.5.
Full text
4
Flórez Trespalacio, Luisa Fernanda, and María Alexandra Gutiérrez Calderón. "Identificación del acoso laboral en los trabajadores del hospital en el departamento de Sucre – Colombia." In Aportes investigativos de los semilleros del Nodo de Investigación de Psicología de las Organizaciones y del Trabajo POT. Asociación Colombiana de Facultades de Psicología - ASCOFAPSI, 2024. http://dx.doi.org/10.61676/9786289532456.09.
Full textAbstract:
El acoso laboral es una problemática que se manifiesta en escenarios de índole organizacional en ámbitos privados y públicos, fenómeno que adquiere mucho más protagonismo puesto que puede ocasionar repercusiones a nivel psicológico como estrés, ansiedad y depresión. Todo lo anterior se aleja de la norma relacionada al bienestar y la dignidad del trabajador según lo contemplado por la Organización Internacional del Trabajo (OIT) y en Colombia por la Ley 1010 de 2006. De acuerdo con lo planteado, el objetivo de esta investigación es analizar la existencia de acoso laboral y su influencia en la calidad de vida laboral de los trabajadores del Hospital Nuestra Señora de las Mercedes en el departamento de Sucre, teniendo en cuenta que esta es una población con una alta incidencia de acoso laboral, proveniente de la interacción laboral entre jefes y compañeros. La metodología que se utilizó fue de modo cuantitativo-descriptivo, para llevar a cabo la recopilación de la información se empleó el cuestionario, sobre la incidencia del acoso laboral en la calidad de vida laboral de los trabajadores diseñado por la investigadora y validado por jueces expertos, con una muestra representativa de 68 empleados. Finalmente, dentro del análisis de los resultados se pudo identificar que el acoso laboral afecta de manera moderada la calidad de vida laboral de los funcionarios de la organización.
5
Győrfi, Gergely. "Der Sequester der jüdischen Geschäfte und Betriebe in Kaposvár nach der deutschen Besatzung." In New Investigations into the Economic and Social History of Hungary from the 18th to 21st Century. Working Group of Economic and Social History Regional Committee of the Hungarian Academy of Sciences in Pécs, 2024. http://dx.doi.org/10.15170/seshst-04-17.
Full textAbstract:
Der Zweck der Studie. Die Geschichte der Juden, die einmal in Kaposvár gelebt haben wohl aktenmässig. Zahlreiche Monographien wurden über ihre Geschichte geschrieben und derzeit gibt es mehrere Forschungen, die sich mit ihrer Geschichte beschäftigen. Die Historiker haben die lokale jüdische Gemeinschaft der umfassenden Geschichte geschrieben und natürlich haben die deutsche Besatzung und die nächsten Vorfälle der Monate die Aufmerksamkeit der Geschichtswissenschaftler nicht gemieden. Meine Studie fokussiert auch auf diese Epoche aber die untersucht anderen Aspekte als die früheren Forschungen. Mein Essay präsentiert die Entrechtung der jüdischen Unternehmer und der Sequester, der an ihre Geschäfte und Betriebe hat angegangen. Ich investigiere der Umstand der Konfiszierung und des Sequesters, sowie die Zuweisung ihrer Grundstücke für lokalen christlichen Unternehmer. In erster Linie suche ich nach den Antworten für nächste Fragen: wer Gesuch für die jüdischen Geschäfte und Betriebe eingelegt hatte; welche Motivationen die hatten; wie die Konfiszierung geschehen ist und wie die Behörden Entscheidung getroffen hatten. Die Studie setzt große Aufmerksamkeit zu den gültigen Gesetzen und Verordnungen und ihre praktische Ausführung. Anwendende Methode. Die Studie beruht grundlegend auf archivarischen Quellen, die im lokalen Archiv gesucht werden (Ungarische Nationalarchiv, Komitat Somogy Archiv). Ich benutze die Dokumente, die der Vizegespan (alispán) und die lokale Selbstverwaltung bearbeitet haben. Natürlich habe ich nächst die primären Quellen relevanter Monographien und Studien aufgewandt. In meinem Essay setzt thematischer Aufbau durch, so Geschichte der jüdischen Geschäfte und Betriebe werden präsentiert im abgesetzten Kapitel. Ergebnisse. Dank meiner Studie erhielt der Reader ein umfassendes Resümee über der Geschichte der jüdischen Geschäfte und Betriebe, die in der Stadt funktioniert haben, wenn deutsche Armee angekommen ist. Mein Essay berichtet über die Gesetze und Verordnungen, die nach der deutschen Okkupation eingeführt haben und sie haben auf jüdische Staatsbürger bezogen die Unternehmer waren. Zusätzlich präsentiert meine Studie diese Gesetze und Verordnungen des Effektes auf die Wirtschaft der Stadt, so es wird kenntlich, dass diese Veranlassung antisemitische Schaden angereicht haben, wenn die Antwort ja ist, wie groß diese Schade waren, welche Veranlassungen die kompetenten Ämter gefasst haben um die spruchreifen Zustände zu konsolidieren.
6
Trudgeon, Allison, Kristin Nesbit, Larissa Yocom, and R. Justin DeRose. "Regeneration of quaking aspen (Populus tremuloides) after fire risk reduction treatments." In Advances in Forest Fire Research 2022. Imprensa da Universidade de Coimbra, 2022. http://dx.doi.org/10.14195/978-989-26-2298-9_231.
Full textAbstract:
Quaking aspen (Populus tremuloides Michx.) is a keystone species in the western US, and typically requires high-severity disturbance (historically stand-replacing fire) to regenerate and maintain population health when coexisting with conifers. Aspen forests are declining due to fire suppression, herbivory, and drought, and restoration is a priority for many forest managers. Prescribed fire and harvest are currently the only fuel reduction treatments in practice, imposing limitations on land managers. A mechanical treatment method, called ‘roller-felling,’ has been developed to mimic stand-replacing fire by reducing fuel loading and resetting succession of late-seral stage, conifer-dominated, aspen communities. We examined the ecological impact of roller-felling by investigating factors contributing to post-treatment aspen regeneration, ultimately determining the feasibility of this method as an alternative, stand-replacing disturbance treatment. Specifically, I quantified aspen regeneration stem densities to determine if the result emulated stand-replacing fire. I also measured other metrics of treatment “successâ€, with additional factors influencing aspen regeneration, including the ratio of suckers to true seedling establishment, ungulate browsing pressure, and herbaceous understory diversity before and after treatment. Preliminary, single-growing season, results indicate densities exceed threshold-related objectives, while related ecological impacts remain less conclusive. A second year of sampling in this upcoming field season will allow for more definitive, short-term results on the comprehensive, ecological impact of roller-felling. This research could allow for widespread application in remote areas where logging is unfeasible and in Wildland Urban Interface areas, where prescribed fire can pose a risk to communities. Additionally, this will set groundwork for long-term monitoring of roller-felled areas, furthering understanding of aspen regeneration dynamics, and will apply to forest and fire management regionally, where goals are to reduce fire risk and maintain aspen communities across the western US.
7
Sakata, Shinichiro, and Brendan J. Moran. "Small bowel obstruction." In Duodenum and Small Bowel, edited by John A. Windsor, Sanjay Pandanaboyana, Anil K. Agarwal, Samiran Nundy, and Dirk J. Gouma. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/med/9780192862440.003.0007.
Full textAbstract:
Abstract Small bowel obstruction (SBO) is a surgical emergency that results in morbidity and mortality in a substantial number of patients. SBO is characterized by failure of the normal passage of intestinal contents and its features include colicky abdominal pain, nausea, vomiting, abdominal distension, and absolute constipation. In developed nations, the most common cause of SBO in adults is postoperative adhesions. Other causes include abdominal wall hernias, malignancy, Crohn’s disease, volvulus, and obstructing lesions distal to the small bowel. In contrast, SBO in adults from developing countries, including rural regions of the Indian subcontinent, may be a result of parasitic infections, abdominal wall hernias, and postoperative adhesions. Laboratory tests are used to assess the presence and severity of hypovolaemia, leucocytosis, and metabolic abnormalities such as hyponatraemia and hypokalaemia. Although supine and erect plain abdominal X-rays are helpful initial investigations, computed tomography is the preferred imaging technique for SBO as it identifies the location of the site of obstruction, differentiates between partial and complete SBO, and determines the cause of the obstruction by identifying hernias, masses, and strictures. Non-operative management involves intravenous resuscitation combined with nasogastric decompression. This so-called drip-and-suck strategy should be attempted in all patients with SBO unless there are signs of strangulation. Laboratory tests and imaging are not adequately sensitive in ruling out strangulated SBO. A patient with bowel obstruction, obvious septic physiology, and peritonitis should be considered for urgent surgical exploration, irrespective of reassuring laboratory or imaging results. Laparoscopy can be considered in selected cases of SBO provided an experienced laparoscopic surgeon, team, and equipment are available. An early conversion to laparotomy should not be considered a failure as patient safety is paramount.
Conference papers on the topic "Sucker investigation"
1
Shakhmatov, Aleksey, Oscar Martinez, Robert Badrak, Sergey Kolesov, Rodrigo Barreto, and William Howie. "Investigation of the Corrosion Performance of Stainless Steel and Low Alloy Steel Sucker Rod Materials in Aggressive Environments." In CORROSION 2020. NACE International, 2020. https://doi.org/10.5006/c2020-14321.
Full textAbstract:
Abstract The corrosion resistance of sucker rod materials can be a significant concern, especially in aggressive service environments with high acid gas concentrations. Corrosion-related failures have been associated with increased levels of produced hydrogen sulfide (H2S) and carbon dioxide (CO2). The presence of corrosion damage, which is characterized by local material dissolution and pitting formation under the influence of CO2 and/or H2S, provides the initiation sites in a fatigue cracking mechanism. The fatigue crack propagation in corrosion aggressive environments is associated with the following factors: (1) local tensile stress concentration at crack tip, and (2) local corrosion dissolution. Therefore, using a material that tends to re-passivate as it interacts with the environment would be the optimum solution in order to mitigate the likelihood of field failures and reduce overall operating costs. Regarding passive film disruption processes abrasion and high temperature influences were not considered at this stage of the present study and repassivation kinetics were not measured. Conventional sucker rod production processes include normalize and temper (N&T) or quench and temper (Q&T) heat treatments to meet desired strength levels of low alloy steels. In order to enhance the corrosion properties and provide a resistant sucker rod solution, 13Cr martensitic stainless steel may provide a viable alternative to low alloys steels. This paper focuses on the characterization of 13Cr sucker rod material by comparing the general corrosion and corrosion fatigue performance with low-alloy steels.
2
Shakhmatov, Aleksey, Robert Badrak, William Howie, Rodrigo Barreto, and Oscar Martinez. "Sucker Rod Materials – Metallurgical Quality Evaluation and Its Influence on General Corrosion Resistance." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16733.
Full textAbstract:
Abstract Sucker rod pumps are widely used in artificial lift technology of Oil & Gas production. Corrosion, fatigue and corrosion-fatigue are common failure modes that limit life of the sucker rods that drive these pumps. Of these, corrosion fatigue is probably the most common. The initiation site for corrosion fatigue is typically a corrosion pit. The factors that contribute to the formation of corrosion pits were investigated. Four different sucker rod materials were evaluated with respect to (1) chemistry, (2) nonmetallic inclusion content and (3) microstructural investigation including banding severity. It was concluded that microstructural banding has a negative influence on the general corrosion rates. The higher values of quantitively measured banding lead to increased general corrosion rates. The electrochemical potential differences between the light and dark bands is proposed as the cause of locally accelerated corrosion resulting in pits. The dark bands in the less corrosion resistant samples were lower bainite and these were presented as being more anodic.
3
Kovacs, William, Liu Cao, Kavitha Tummala, et al. "Microstructural Investigation of Sour Corrosion Phenomena in UNS C72900." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-11322.
Full textAbstract:
Abstract UNS1 C72900 has many applications in Oil & Gas exploration because of properties that include low friction, high wear resistance, non-magnetic, high strength and corrosion resistance. However, the specific sour corrosion phenomena of this copper alloy have not been extensively studied and clear corrosion and cracking usage limits have not yet been established. It is for these reasons that the alloy is not specifically listed in the materials recommendation for sucker rod pumps (NACE(2) MR01762), in NACE Publication 1F1923 or in ANSI(3)/NACE MR0175-2015 / ISO(4) 15156-34 (NACE MR0175). This is situation is not ideal, as end users are restricted in applicability by the absence of information, or exposed to risks when the alloys is utilized due to the same absence of information. This paper addresses some of the sour corrosion phenomena observed in laboratory testing as it related to the microstructural features of those specimens. This was investigated through a parametric study of varying temperature and levels of H2S and chloride. The end goal of this work was to increase the knowledge base about UNS C72900 and to associate some of the possible corrosion phenomena with the underlying metallurgy of the alloy(s).
4
Schafer, D. J., and J. W. Jennings. "An Investigation of Analytical and Numerical Sucker Rod Pumping Mathematical Models." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1987. http://dx.doi.org/10.2118/16919-ms.
Full text
5
Ohtsuji, Takamasa, and Buhei Kobayashi. "72 Investigation of low emission two-stroke cycle engine chainsaw." In Small Engine Technology Conference & Exposition. Society of Automotive Engineers of Japan, 2002. http://dx.doi.org/10.4271/2002-32-1841.
Full textAbstract:
<div class="htmlview paragraph">This paper presents some experimental and theoretical results of a low emission two-stroke cycle spark ignition engine for chainsaws, applied a stratified scavenging method to reduce Total Hydrocarbon (THC) emission caused by air/fuel mixture short-circuiting during the scavenging process. Stratified scavenging methods are applied reed valves to control air sucked into transfer ports for stratified scavenging during sucking process. The new chainsaw engine, however, is applied piston valves instead of the reed valves to keep the same size and to be simple structure as conventional Schnurle scavenging engine chainsaws. The piston has grooves built with both sides. The grooves connect an air inlet to transfer ports to suck air into the transfer ports during the sucking process. The new chainsaw, having the same power as conventional chainsaws, is reduced THC emission to about 1/3 of conventional one and can meet to EPA Phase II regulation on and after 2005 without catalyst.</div>
6
Naser, Abuelfotouh A., and Fadel Dahab. "Cost-Effective Solution for Harsh Well Conditions Reciprocating Rod Pumping (RRP) Wells in Oman." In SPE Conference at Oman Petroleum & Energy Show. SPE, 2024. http://dx.doi.org/10.2118/218499-ms.
Full textAbstract:
Abstract With continuous instability of oil prices, it became necessary to reduce the cost of lifting the crude oil from the wells. This cost reduction is not feasible for each stage of the total oil production system; therefore, the optimization of each component in the production system is a must. The primary challenge is to extend the lifting equipment run life, especially the downhole components. For years, operators have been looking for reliable, flexible, and intelligent lifting systems to improve their operating costs, reservoir recovery factor by maximizing well production. Production optimization meant to apply an optimum analysis and comprehensive investigation of well production system; including the artificial lift system that expected to increase the oil production and reduce the operating costs. When producing difficult fluids from marginal, mature, and brown onshore oil fields, Sucker rod (Beam and Progressive Cavity) Pumping systems are typically the most common artificial lift methods used. The primary challenge is to extend the lifting equipment run life, especially the downhole components. Production optimization found to be an essential for the life cycle of each system to extend run life, decrease cost, and increase the cumulative production per well. High WC (90% & above), corrosive environment, sand production & scale build up resulted from water flooding effect are factors that result in harsh operating condition that dramatically affect downhole equipment lifetime & lead to premature failure. In some of the fields premature failures resulted from harsh operating conditions are found close to 70% of total premature failure & 35% of total failures. The failures and problems related to Beam pumping (BP) and the success resulted from the applications of the system optimization has encouraged us to be selected to be the subject of this paper. This presentation will discuss in full details the current downhole pump failures, challenges & plan of improving downhole pump metallurgy, configuration the application using latest technology in BP system. It will share different case histories and best practices from BP Wells by using actual well data and performance. This topic can be summarized in: - Heavy oil harsh well condition challenges & operational performance of beam pumping system in such these conditions. Solids & abrasives related failures investigation & solution planning Success stories maximizing pump efficiencies and minimizing failure rates of beam pumping system Cost saving impact after using solutions.
7
Naser, Abuelfotouh A. "The Optimal and Cost-Effective Artificial Lift System (ALS) Combination, Success Case Studies, and Cost Saving Assessment for RRP (Reciprocating Rod Pump) Wells in Oman." In SPE Middle East Artificial Lift Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/221548-ms.
Full textAbstract:
Abstract With continuous instability of oil prices, it became necessary to reduce the cost of lifting the crude oil from the wells. This cost reduction is not feasible for each stage of the total oil production system; therefore, the optimization of each component in the production system is a must. The primary challenge is to extend the lifting equipment run life, especially the downhole components. For years, operators have been looking for reliable, flexible, and intelligent lifting systems to improve their operating costs, reservoir recovery factor by maximizing well production. Production optimization meant to apply an optimum analysis and comprehensive investigation of well production system; including the artificial lift system that expected to increase the oil production and reduce the operating costs. When producing difficult fluids from marginal, mature, and brown onshore oil fields, Sucker rod (Beam and Progressive Cavity) Pumping systems are typically the most common artificial lift methods used. The primary challenge is to extend the lifting equipment run life, especially the downhole components. Production optimization found to be an essential for the life cycle of each system to extend run life, decrease cost, and increase the cumulative production per well. High WC (90% & above), corrosive environment, sand production & scale build up resulted from water flooding effect are factors that result in harsh operating condition that dramatically affect downhole equipment lifetime & lead to premature failure. In some of the fields premature failures resulted from harsh operating conditions are found close to 70% of total premature failure & 35% of total failures. The failures and problems related to Beam pumping (BP) and the success resulted from the applications of the system optimization has encouraged us to be selected to be the subject of this paper. This presentation will discuss in full details the current downhole pump failures, challenges & plan of improving downhole pump metallurgy, configuration the application using latest technology in BP system. It will share different case histories and best practices from BP Wells by using actual well data and performance. This topic can be summarized in: - Heavy oil harsh well condition challenges & operational performance of beam pumping system in such these conditions. Solids & abrasives related failures investigation & solution planning Success stories maximizing pump efficiencies and minimizing failure rates of beam pumping system Cost saving impact after using solutions.
8
Sato, Hideaki, Soichiro Tabata, Naoto Tochitani, Yasuhiro Sasao, Ryo Takata, and Masaki Osako. "Investigation of Moisture Removal on Last Stage Stationary Blade in Actual Steam Turbine." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14831.
Full textAbstract:
Abstract This paper presents an investigation for wet steam flow through the slit on the last stage hollow stationary blades of a steam turbine. The aim of this investigation is to evaluate the moisture removal performance by measuring the quantity of drain and “Motive steam” from some kinds of slit configurations under the actual turbine operating environment. Motive steam is effective steam sucked from the slit and removed together with drain. The measurement was carried out on a 105 MW class steam turbine at “T-point”, a verification power plant owned by Mitsubishi Hitachi Power Systems, Ltd. [MHPS]. The measurement system was constructed right under the turbine. Even though both drain and steam were sucked from the slit on the stationary blade, drain was separated by the cyclone separator and measured by detecting the water level accumulated in the water level tank by the optical pulse sensor. For the measurement of the motive steam quantity, the choked flow rate measured by the critical nozzle was used to obtain the slit characteristic data of pressure ratio (ratio of blade surface static pressure to outer ring inner pressure). The critical nozzles were arranged in parallel, and the measurement was carried out by adopting a multi-valve switching system. And CFD slit analysis, in which the drain discharge path inside the last stage hollow stationary blade is modeled, was also carried out. The CFD slit analysis was compared with the measurement result to examine the internal flow. The corresponding CFD was calculated by ANSYS CFX. And the coarse water droplets analysis by the kinetic equation of the discrete droplet model was also carried out. From the measurement result and the evaluation, it was confirmed that the slit with groove configuration is more effective than the normal slit under the actual turbine operating environment.
9
Wanjin, Han, Wang Zhongqi, and Xu Wenyuan. "An Experimental Investigation Into the Influence of Blade Leaning on the Losses Downstream of Annular Cascades With a Small Diameter-Height Ratio." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-19.
Full textAbstract:
Five types of cascades with different leaned blades have been tested in a low speed annular cascade tunnel. The experimental results show that by using positively leaned blades the hub wall boundary layer in cascade passage can be sucked into main stream zone, and the amount of low energy gas getting into downstream of the cascade is reduced obviously, so that the energy losses downstream is decreased considerably.
10
Sheng, Wanan, Florent Thiebaut, Marie Babuchon, Joseph Brooks, Anthony Lewis, and Raymond Alcorn. "Investigation to Air Compressibility of Oscillating Water Column Wave Energy Converters." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10151.
Full textAbstract:
It has been suggested that for full scale oscillating water column (OWC) devices, the pressure in and the volume of the air chambers can be large to create air compressibility in the air chamber. Due to compressibility, its density and temperature are different from those in atmosphere. When in exhalation, the pressurized air is driven out of the air chamber and mixes into the atmosphere outside the air chamber; whilst in inhalation, the atmosphere is sucked through the power take-off (PTO) system into the air chamber, and mixes with the de-pressurized air in the chamber. This paper presents a study on air compressibility in OWC air chambers by theoretical analyses and the relevant experimental studies. The theoretical analysis is based on the first-order differential equation for the flowrate and the chamber pressure, which has been derived for the air flow under the assumptions of the isentropic process and the known power take-off characteristics. In the study, an orifice type of PTO and a porous membrane type PTO, which are supposed to represent a typical nonlinear and linear PTO for small models, respectively, are both investigated. The investigation has shown the feasibility of the theoretical method on the air compressibility and the possible power loss due to the air compressibility.
Reports on the topic "Sucker investigation"
1
Lahav, Ori, Albert Heber, and David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, 2008. http://dx.doi.org/10.32747/2008.7695589.bard.
Full textAbstract:
The project was originally aimed at investigating and developing new efficient methods for cost effective removal of ammonia (NH₃) and hydrogen sulfide (H₂S) from Concentrated Animal Feeding Operations (CAFO), in particular broiler and laying houses (NH₃) and hog houses (H₂S). In both cases, the principal idea was to design and operate a dedicated air collection system that would be used for the treatment of the gases, and that would work independently from the general ventilation system. The advantages envisaged: (1) if collected at a point close to the source of generation, pollutants would arrive at the treatment system at higher concentrations; (2) the air in the vicinity of the animals would be cleaner, a fact that would promote animal growth rates; and (3) collection efficiency would be improved and adverse environmental impact reduced. For practical reasons, the project was divided in two: one effort concentrated on NH₃₍g₎ removal from chicken houses and another on H₂S₍g₎ removal from hog houses. NH₃₍g₎ removal: a novel approach was developed to reduce ammonia emissions from CAFOs in general, and poultry houses in particular. Air sucked by the dedicated air capturing system from close to the litter was shown to have NH₃₍g₎ concentrations an order of magnitude higher than at the vents of the ventilation system. The NH₃₍g₎ rich waste air was conveyed to an acidic (0<pH<~5) bubble column reactor where NH₃ was converted to NH₄⁺. The reactor operated in batch mode, starting at pH 0 and was switched to a new acidic absorption solution just before NH₃₍g₎ breakthrough occurred, at pH ~5. Experiments with a wide range of NH₃₍g₎ concentrations showed that the absorption efficiency was practically 100% throughout the process as long as the face velocity was below 4 cm/s. The potential advantages of the method include high absorption efficiency, lower NH₃₍g₎ concentrations in the vicinity of the birds, generation of a valuable product and the separation between the ventilation and ammonia treatment systems. A small scale pilot operation conducted for 5 weeks in a broiler house showed the approach to be technically feasible. H₂S₍g₎ removal: The main goal of this part was to develop a specific treatment process for minimizing H₂S₍g₎ emissions from hog houses. The proposed process consists of three units: In the 1ˢᵗ H₂S₍g₎ is absorbed into an acidic (pH<2) ferric iron solution and oxidized by Fe(III) to S⁰ in a bubble column reactor. In parallel, Fe(III) is reduced to Fe(II). In the 2ⁿᵈ unit Fe(II) is bio-oxidized back to Fe(III) by Acidithiobacillus ferrooxidans (AF).In the 3ʳᵈ unit S⁰ is separated from solution in a gravity settler. The work focused on three sub-processes: the kinetics of H₂S absorption into a ferric solution at low pH, the kinetics of Fe²⁺ oxidation by AF and the factors that affect ferric iron precipitation (a main obstacle for a continuous operation of the process) under the operational conditions. H₂S removal efficiency was found higher at a higher Fe(III) concentration and also higher for higher H₂S₍g₎ concentrations and lower flow rates of the treated air. The rate limiting step of the H₂S reactive absorption was found to be the chemical reaction rather than the transition from gas to liquid phase. H₂S₍g₎ removal efficiency of >95% was recorded with Fe(III) concentration of 9 g/L using typical AFO air compositions. The 2ⁿᵈ part of the work focused on kinetics of Fe(II) oxidation by AF. A new lab technique was developed for determining the kinetic equation and kinetic parameters (KS, Kₚ and mₘₐₓ) for the bacteria. The 3ʳᵈ part focused on iron oxide precipitation under the operational conditions. It was found that at lower pH (1.5) jarosite accumulation is slower and that the performance of the AF at this pH was sufficient for successive operation of the proposed process at the H₂S fluxes predicted from AFOs. A laboratory-scale test was carried out at Purdue University on the use of the integrated system for simultaneous hydrogen sulfide removal from a H₂S bubble column filled with ferric sulfate solution and biological regeneration of ferric ions in a packed column immobilized with enriched AFbacteria. Results demonstrated the technical feasibility of the integrated system for H₂S removal and simultaneous biological regeneration of Fe(III) for potential continuous treatment of H₂S released from CAFO. NH₃ and H₂S gradient measurements at egg layer and swine barns were conducted in winter and summer at Purdue. Results showed high potential to concentrate NH₃ and H₂S in hog buildings, and NH₃ in layer houses. H₂S emissions from layer houses were too low for a significant gradient. An NH₃ capturing system was designed and tested in a 100-chicken broiler room. Five bell-type collecting devices were installed over the litter to collect NH₃ emissions. While the air extraction system moved only 10% of the total room ventilation airflow rate, the fraction of total ammonia removed was 18%, because of the higher concentration air taken from near the litter. The system demonstrated the potential to reduce emissions from broiler facilities and to concentrate the NH₃ effluent for use in an emission control system. In summary, the project laid a solid foundation for the implementation of both processes, and also resulted in a significant scientific contribution related to AF kinetic studies and ferrous analytical measurements.