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1
Candiani, Vera S. "Reframing knowledge in colonization: Plebeians and municipalities in the environmental expertise of the Spanish Atlantic". History of Science 55, n. 2 (9 maggio 2017): 234–52. http://dx.doi.org/10.1177/0073275317706041.
Testo completoAbstract (sommario):
Promoting a better understanding of the phenomenon of colonization and its connection with environmental knowledge and technology, this article proposes a reframing of research agendas to take into account the municipal character of colonization in the Hispanic realm and to ask new questions. Questions should address what human–ecosystem relations, and the ways of knowing and techniques for transforming the physical realm, can tell us about colonization itself; who the historical agents involved were, and what these actors knew, learned, and did in their environments. Using the Basin of Mexico’s drainage and the agency of commoners, this article proposes that colonization depends on the massive deployment and generation of tacit knowledge about how to harness matter, energy, and time for the reproduction of human societies; the quotidian appropriation and reworking of autochthonous knowledge, techniques, and technology by the colonizing groups; the collaboration of the local populations in whom these are vested; and the agency of commoners with practical skills, environmental knowledge, and technological savvy derived from and honed in the realm of material production. In the Ibero-American realm, these agents were primarily commoners with skills in agropastoral production and the building trades; race, ethnicity, language, and gender were secondary conditions.
2
McFarland, E. W. "Solar energy: setting the economic bar from the top-down". Energy Environ. Sci. 7, n. 3 (2014): 846–54. http://dx.doi.org/10.1039/c3ee43714k.
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Maple, J. H. C. "The JET project — a major step to harness energy from fusion". Endeavour 10, n. 4 (gennaio 1986): 177–83. http://dx.doi.org/10.1016/0160-9327(86)90091-8.
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Croca, J. R., P. Castro, R. Moreira e M. M. Silva. "Nonlinearity and Energy Conservation: A Possible Way to Harness Energy from the Subquantum Medium". Theoretical Physics 3, n. 2 (8 giugno 2018): 51–57. http://dx.doi.org/10.22606/tp.2018.32005.
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Yan, Fei, Lina Yao, Kenxin Chen, Qian Yang e Bin Su. "An ultrathin and highly porous silica nanochannel membrane: toward highly efficient salinity energy conversion". Journal of Materials Chemistry A 7, n. 5 (2019): 2385–91. http://dx.doi.org/10.1039/c8ta10848j.
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Knight, Helen. "Project Aims to Get Real-Time Damage Detection on Track". Engineer 299, n. 7906 (marzo 2019): 6. http://dx.doi.org/10.12968/s0013-7758(23)90535-0.
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Grisouard, Nicolas. "Extraction of Potential Energy from Geostrophic Fronts by Inertial–Symmetric Instabilities". Journal of Physical Oceanography 48, n. 5 (maggio 2018): 1033–51. http://dx.doi.org/10.1175/jpo-d-17-0160.1.
Testo completoAbstract (sommario):
AbstractSubmesoscale oceanic density fronts are structures in geostrophic and hydrostatic balance, which are prone to inertial and/or symmetric instabilities. We argue in this article that drainage of potential energy from the geostrophic flow is a significant source of their growth. We illustrate our point with two-dimensional Boussinesq numerical simulations of oceanic density fronts on the f plane. A set of two-dimensional initial conditions covers the submesoscale portion of a three-dimensional parameter space consisting of the Richardson and Rossby numbers and a measure of stratification or latitude. Because we let the lateral density gradient decay with depth, the parameter space map is nontrivial, excluding low-Rossby, low-Richardson combinations. Dissipation and the presence of boundaries select a growing mode of inertial–symmetric instability consisting of flow cells that disturb isopycnal contours. Systematically, these isopycnal displacements correspond to a drainage of potential energy from the geostrophic fronts to the ageostrophic perturbations. In the majority of our experiments, this energy drainage is at least as important as the drainage of kinetic energy from the front. Various constraints, some physical, some numerical, make the energetics in our experiments more related to inertial rather than symmetric instabilities. Our results depend very weakly on the Richardson number and more on the Rossby number and relative stratification.
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Degrenne, Nicolas, Francois Buret, Bruno Allard e Jean Michel Monier. "Progress in Microbial Fuel Cells Energy Production". Advanced Materials Research 324 (agosto 2011): 457–60. http://dx.doi.org/10.4028/www.scientific.net/amr.324.457.
Testo completoAbstract (sommario):
Microbial fuel cells (MFCs) harness the natural metabolisms of microbes to produce electrical power from almost any kind of organic matter. In addition to the low power densities (about 1mW for a 1-liter reactor), MFCs are presently built with expensive membrane and electrodes. The payback time of MFCs is therefore very long (evaluated to 25000 years for our lab prototype). Progresses in designing low-cost MFCs are necessary before conceiving large scale energy production.
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Teoh, Hong Wooi, e Ving Ching Chong. "Versatile hermit crabs harness multiple-source energy from coastal mudflats: implications for fish production". Aquatic Ecology 49, n. 1 (22 gennaio 2015): 43–55. http://dx.doi.org/10.1007/s10452-015-9503-x.
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Lyapidevskaya, Olga. "Drainage material produced from roofing waste". MATEC Web of Conferences 196 (2018): 04036. http://dx.doi.org/10.1051/matecconf/201819604036.
Testo completoAbstract (sommario):
As of today, the development of energy efficient and recycling technologies seems to be urgent. This article considers the problem of recycling of wastes in roofing industry, which is a serious environmental contamination source and creates a significant fire hazard. We have made an attempt to create a new drainage material from roofing waste. This material has the appearance of fibrous board, which is made of trimmings of bitumen-impregnated roofing roll materials thermally bonded in contact points. The technological scheme of the producing of the material was developed. The material was tested to determine its physical and mechanical properties (tensile and compressive strength, water permeability and porosity) and to optimize its technological parameters. According to the results of the experiment it was founded that the material has sufficient physical and mechanical properties, meets the technical requirements for drainage materials and can be recommended for use in underground construction.
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Schoeffler, Allyn J., e James M. Berger. "DNA topoisomerases: harnessing and constraining energy to govern chromosome topology". Quarterly Reviews of Biophysics 41, n. 1 (febbraio 2008): 41–101. http://dx.doi.org/10.1017/s003358350800468x.
Testo completoAbstract (sommario):
AbstractDNA topoisomerases are a diverse set of essential enzymes responsible for maintaining chromosomes in an appropriate topological state. Although they vary considerably in structure and mechanism, the partnership between topoisomerases and DNA has engendered commonalities in how these enzymes engage nucleic acid substrates and control DNA strand manipulations. All topoisomerases can harness the free energy stored in supercoiled DNA to drive their reactions; some further use the energy of ATP to alter the topology of DNA away from an enzyme-free equilibrium ground state. In the cell, topoisomerases regulate DNA supercoiling and unlink tangled nucleic acid strands to actively maintain chromosomes in a topological state commensurate with particular replicative and transcriptional needs. To carry out these reactions, topoisomerases rely on dynamic macromolecular contacts that alternate between associated and dissociated states throughout the catalytic cycle. In this review, we describe how structural and biochemical studies have furthered our understanding of DNA topoisomerases, with an emphasis on how these complex molecular machines use interfacial interactions to harness and constrain the energy required to manage DNA topology.
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Khan, Irfanullah. "Internet of Things Based Transducer Application to Harness Tidal Energy from coastal and offshore Pakistan". Sukkur IBA Journal of Emerging Technologies 5, n. 1 (30 giugno 2022): 78–89. http://dx.doi.org/10.30537/sjet.v5i1.1073.
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This paper aims to transform tidal energy into rotation energy for electricity generation and in the course evaluating sea parameters. This is accomplished by integrating the Internet of Things with tidal energy off the coast (and in a home environment), which further enhances the capabilities of this prototype project to remotely monitor sea-like parameters to enable energy production using tidal energy. As South Korea is transducing tidal energy with a total installed tidal power capacity of above 500MW, Pakistan and Middle Eastern countries can benefit from its vast coastal line. This paper proposes a sustainable design that makes the turbine rotate at high speed. A vertical design is chosen, which is bi-directional. The design of the turbine consists of 3 blades, each occupying a 2 square feet area supported by an iron-rod frame. During the experimentation, an average voltage of 5V was generated, whereas the speed of the turbine generated was 75 RPM. It is the first known attempt of its kind supported by indigenous resources. It is proposed that this type of prototype can be scaled, to the coast to produce electrical energy to meet the energy production needs of the region.
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I.J., Magaji, Sufiyan I., Dahiru M.K. e Bello I.E. "MORPHOMETRIC ANALYSIS OF MINJIBIR-WASE DAM, KANO STATE, NIGERIA". Engineering Heritage Journal 6, n. 2 (2022): 58–64. http://dx.doi.org/10.26480/gwk.02.2022.58.64.
Testo completoAbstract (sommario):
The Minjibir-Wase dam was constructed along the drainage system from the Jakara stream and linked with Dambattan flow that channelled through the lowland of the Minjibir via the main tributaries which drained into Hadeja. The idea of the dam was initiated during the Abdu-Bako era for sustainable irrigation Agriculture. More than twenty thousand people are benefiting from the dam. To harness the water resources, a private tourist centre was established along the coastal region of the dam where different recreational facilities were put in place to attract foreign investment and for leisure. The method used is the application of Hydrological software ArcSWAT and ArcGIS to map and evaluate the area morphometric characteristics of the basin parameters examined includes the slope gradient, sub-basin length, width, density, flow accumulation and direction and depth of the Basin.
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Aggarwal, Jitisha, e M. L. Aggarwal. "Harnessing Solar Energy for Every Home: Energy Saving Applications". Conference Papers in Science 2014 (10 aprile 2014): 1–3. http://dx.doi.org/10.1155/2014/628294.
Testo completoAbstract (sommario):
Most of the present day resources of energy are limited and irreplaceable. The next generation will face acute energy crisis if alternate resources of energy are not developed concurrently. Increasing cost and import of conventional resources have bad effect on the economy of a country, and the only cheaper solution is “unlimited power” from the sun. The use of solar energy is so far limited in household applications. In fact, if we harness only 0.0034 percent of the solar energy reaching the Earth’s surface, the energy need of the whole world will be met. In the present work, a substitute of 10-watt conventional night lamp has been proposed by a solar night lamp of the same light intensity through an experimental setup. The developed solar system is cheaper, portable, user friendly, and free from maintenance. The paper stresses on the need of replacement of conventional night lamp by solar night lamp in every home for reducing the energy crisis at present.
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Fan, Kang Qi, Bo Wang e Hai Dong Huo. "A Novel Tri-Direction Energy Harvester Using Bimorph Cantilever Structure". Applied Mechanics and Materials 220-223 (novembre 2012): 669–73. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.669.
Testo completoAbstract (sommario):
Energy harvesting for powering low-power devices has drawn considerable attention over the last decade. This paper reports a novel tri-direction energy harvester to scavenge energy from wind and vibration, or a combination of them. The proposed harvester consists of a triple-level bimorph cantilever with a mass block to harness energy from ambient vibration. The mass block also acts as an aerofoil and bluff body to scavenge energy from wind. Theoretical analysis shows that the maximum output power of the harvester is 2.77 W, and the resonance frequency is 79 Hz.
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HAN, Yechen, Xing He, Haihong ZHANG, Yuanjun ZUO, Wenjing ZHANG, Qian Ai e Zhuo CHEN. "Metaverse Framework Designing for Energy Scheduling in Energy Internet of Things Considering Emergence". Digital Twin 3 (7 agosto 2023): 6. http://dx.doi.org/10.12688/digitaltwin.17873.1.
Testo completoAbstract (sommario):
The traditional scheduling approach, which primarily considers energy oligarchs like large-scale loads and large-scale generators, is challenged by the rapid rise of distributed energy resources (DERs) in energy internet of things (EIoT). Metaverse is emerging as one of the most promising technologies considering emergence from DERs in EIoT. Our work, from a macro perspective in the virtual space, provides a metaverse framework to harness the swarm intelligence that emerges from the aggregation behavior of massive diverse DERs in EIoT. The presented framework is built upon virtual twins, data science, systems theory, and 4th-Paradigm (data-intensive scientific discovery paradigm), enabling a novel energy scheduling mode. Our goal is to achieve data empowerment and intelligence improvement through data connectivity, virtual and real interaction, which will ultimately result in a new theory on complex system scheduling.
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Li, Chuantian, Yingfeng Sun, Shiyue Wu e Xiaoyuan Sun. "Investigation on the Gas Drainage Effectiveness from Coal Seams by Parallel Boreholes". Sustainability 15, n. 2 (4 gennaio 2023): 942. http://dx.doi.org/10.3390/su15020942.
Testo completoAbstract (sommario):
Gas drainage is an important technology to prevent coal and gas outburst, and the drained gas is a kind of clean energy. The gas pressure can characterize gas drainage effectiveness. In this paper, we investigated the effectiveness of gas drainage by gas pressure. Determined by the space shape of the gas flow field, the gas flow state surrounding the drainage boreholes is radial flow. According to the basic equations of radial flow, discrete equations were achieved by the implicit difference scheme, and then we obtained the gas pressure surrounding the drainage boreholes. Results showed that the midpoint between two holes presents the highest gas pressure, and gas pressure declined from the midpoint of two boreholes to both sides. The midpoint gas pressure of the two holes reflects gas drainage effectiveness in a certain degree. Gas pressure declined with segmented characteristics in the first period decline curve in the form of a cubic curve, and the second period decline curve in the form of a straight line. When the drainage pressure reaches a certain value, the decline rate of gas pressure had little relationship with the drainage negative pressure, mainly influenced by the permeability coefficient. To improve the drainage effectiveness, anti-reflection measures are feasible, instead of increasing the drainage negative pressure. Moreover, the conclusion was verified by field data.
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Kanaya, Haruichi. "Battery-less biosensing platform". Impact 2019, n. 10 (30 dicembre 2019): 87–89. http://dx.doi.org/10.21820/23987073.2019.10.87.
Testo completoAbstract (sommario):
As fossil fuel levels are exhausted, building a more sustainable world is an issue that is coming to the fore as a crucial consideration in the development of new technology. The energy needs of the planet's population are immense, and an environmentally friendly source of energy is desperately needed. Energy harvesting from renewable sources is not a new concept - windmills have been around since the first century - but the desire to harness renewable energy has intensified. Energy harvesting technology is the term given to technology used for collecting unused energy from the surrounding environment and converting it into electrical power. Solar, wind and hydroelectric power are perhaps the best-known of these technologies. However, there are many other forms of energy that are under developed and hold much potential for powering the future. These include vibration, pressure, heat and temperature difference. While large-scale power generation cannot be realised using these sources due to their low levels, devices with low power demands may be able to harness such energy sources, potentially eliminating the need for an external power source. Dr Haruichi Kanaya at Kyushu University is leading a team investigating wireless technology.
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Szlązak, Nikodem, e Justyna Swolkień. "Possibilities of Capturing Methane from Hard Coal Deposits Lying at Great Depths". Energies 14, n. 12 (14 giugno 2021): 3542. http://dx.doi.org/10.3390/en14123542.
Testo completoAbstract (sommario):
Methane present in coal seams is a natural hazard present during the exploitation of underground mining plants. It is an explosive and flammable gas that is released into mining excavations, and it is necessary to reduce its concentration. Capturing methane while preparing extraction is virtually impossible due to the low permeability of coal resulting from its deposition depth. After the beginning of exploitation and disrupting the seam’s structure, methane is released into mine air. The most common method of minimizing gas released into ventilation air is draining the rock mass. This method allows achieving the desired ventilation parameters but requires appropriate mining techniques in hazardous areas. The article presents the example of methane capture during the operation in the longwall B-15 with an overlying drainage gallery. The authors have highlighted an example of the longwall B-15 that when using this particular drainage method, allowed capturing twice the amount of methane forecasted, thus increasing the efficiency of methane drainage. At the preliminary stage of longwall development, the amount of methane charged by the drainage system had relatively low values, reaching 15 m3/min. In the next few months, these parameters increased and varied between 35 to 55 m3/min. A significant difference in methane capture appeared in the second stage of exploitation, where the highest value of captured methane reached 82 m3/min. This particular longwall example shows that it is crucial to properly design the drainage system for seams with high forecasted methane release. It is worth remembering that using a drainage gallery provides an increase in the methane capture from the desorption zone areas, thus increasing total methane capture in comparison to forecasts.
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Andenæs, Erlend, Vegard A. Skagseth, Nora S. Bunkholt, Tore Kvande e Jardar Lohne. "Experiences with external drainage systems from compact roofs in Norwegian climates". E3S Web of Conferences 172 (2020): 21010. http://dx.doi.org/10.1051/e3sconf/202017221010.
Testo completoAbstract (sommario):
To reduce loads on urban drainage systems and facilitate local infiltration of stormwater, it is desired to lead runoff water from roofs through external drains and into the local soil. However, in cold climates, situations often arise where water freezes in external drainpipes, damaging the pipes and preventing drainage. This article investigates the perceived feasibility of external drainage when compared against the risk of freezing damage. A literature study investigates mechanics of ice formation in drains and gutters, and under which conditions ice formation poses a risk to the building. Actors in the Norwegian building sector are interviewed about the challenges related to external drainage from compact roofs in several locations in Norway. Findings suggest that external drainage is considered feasible, but many challenges exist. Suggested solutions may conflict with building regulations, either due to risk of damages or through an unreasonably high energy consumption. Passive solutions without heating elements may, however, be feasible in certain climates in Norway. It is suggested that further research follows up the feasibility of using external drainage in relation to local climate and building concepts.
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Zainol, Mohd Zaifulrizal, Haziatul Najihah Zana Rahim, Wardiah Dahalan, Atzroulnizam Abu, Muhamad Fadli Ghani e Ismail Zainol. "Potential Area to Harness the Tidal Energy at West Coast Peninsular Malaysia". Applied Mechanics and Materials 785 (agosto 2015): 637–41. http://dx.doi.org/10.4028/www.scientific.net/amm.785.637.
Testo completoAbstract (sommario):
Malaysia nowadays depends heavily on conventional energy resource for generating electricity and transportation. This will give negative impact and trigger other problems if not well managed. Therefore, it is very important to increase the use of renewable energy especially the tidal energy as the tidal energy is more predictable and reliable renewable energy source. A kinetic energy produced by the tidal differences will be used to generate electricity and involves the use of a tidal turbine. There are two approaches that are being used to harness the tidal energy for the generation of electricity which are barrage approach and tidal stream approach. This paper identify the potential region along west coast of peninsular Malaysia that has higher potential power generation for harnessing tidal energy and study which approach suitable to be applied. From the results, show that the highest potential power generation for harnessing tidal energy is at Pelabuhan Klang with the average power availability is 591.19kW while the lowest is at Tanjung Keling with the average potential power generation is 52.75kW.
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Onitilo, V. O., J. F. Sanusi e B. C. Adebayo-Tayo. "Production, Purification and Characterization of Β-D-Fructofuranosidase from Fusarium oxysporum Isolated from Grape Juice and Soil Sample from Sugar Cane Dumpsite". Advances in Multidisciplinary and scientific Research Journal Publication 8, n. 3 (30 marzo 2022): 1–12. http://dx.doi.org/10.22624/aims/v8n3p1.
Testo completoAbstract (sommario):
β-D-fructofuranosidase is an important enzyme needed in various industrial setup for the production of invert sugars. Production, purification and characterization of β-D-fructofuranosidase by Fusarium oxysporum under submerged fermentation were investigated. β-D-fructofuranosidase production by Fusarium oxysporum ranged from 36. 2- 65.8% and 7.2 -2 0.1% under different pH and incubation time. pH 7 and 7 days incubation time supported the highest production. β-D-fructofuranosidase production ranged from 16.5 - 44.0% and 27.8 - 68.8% when different organic and inorganic carbon sources were used. Potato peels and fructose supported the highest β-D-fructofuranosidase production. Peptone supported the highest β-D-fructofuranosidase production (37.9%) by Fusarium oxysporum. β-D-fructofuranosidase produced from Fusarium oxysporum was purified by Acetone precipitation method and gel filtration respectively. The crude and purified β-D-fructofuranosidase are 65.79% and 19.57%. pH 7, 35oC and 30oC incubation temperature, 2.0 mg/L of honey and molasses and 1.0 mg/L sucrose supported optimum activity of the crude and purified β-D-fructofuranosidase. The enzyme Kinetic parameters (Km and Vmax) are 0.1285mg/mL and 17.36U/mg. in conclusion, Fusarium oxysporum produced Invertase which can be harness for industrial uses. Keyword: Fusarium oxysporum, Sucrose, Enzyme activity, Purification, Peptone
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Raymond, C. F. "Energy balance of ice streams". Journal of Glaciology 46, n. 155 (2000): 665–74. http://dx.doi.org/10.3189/172756500781832701.
Testo completoAbstract (sommario):
AbstractAnalysis of the cross-flow transmission of force from the central parts of a well-lubricated ice stream to its margins shows that there is a corresponding shift in the lateral location of motion-induced heat generation. The rate of basal heat generation in the center can be substantially smaller than the local rate of potential energy loss given by driving stress times the speed of downslope motion. The basal heating is a maximum for an intermediate level of lubrication for which speed is about 40% of the speed over a friction-less bed and base stress is about 25% of the driving stress. Stable and unstable balances between meltwater production and drainage on the bed are identified. A stable steady state with a speed less (more) than that giving maximum heat generation is termed drainage-(production-) limited, since an increase in speed would lead to increased (decreased) basal melting and must (need not) be balanced by increased drainage. It is shown that gradual evolution of the basal water drainage system and the factors affecting basal melting can cause discontinuous jumps between fast- and slow-moving states. A simplified analysis applied to six cross-sections of West Antarctic Ice Streams B, D, E and Rutford Ice Stream shows them to be diverse in the level of support from the sides and corresponding shift of mechanical heating sideward from their central parts. The cross-sections of Ice Stream B near “Upstream B” may be production-limited, because of especially high lubrication and related support from the sides. Cross-sections in the upper part of Ice Stream D, Ice Stream E and Rutford Ice Stream are in a drainage-limited condition. Substantial reduction of basal heat generation by side drag (in most cases) and expected high heat flow into the basal ice associated with low thickness (in some cases) tends to favor basal freezing. Nevertheless, all of the examined cross-sections except one are expected to experience basal melting with a modest geothermal heat-flux density of 60 m W m−1 or less in some cases. The lower part of Ice Stream B is an exception, where the analysis indicates that geothermal flux density must exceed 80–100 m W−1 m to maintain melting. If this high geothermal flux is not present, then the base of the lower part of Ice Stream B may be freezing, which would suggest continued deceleration of this part of Ice Stream B.
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Staniszewski, Ryszard, Dorota Cais-Sokolińska, Łukasz K. Kaczyński e Paulina Bielska. "Use of Bioluminescence for Monitoring Brown Coal Mine Waters from Deep and Surface Drainage". Energies 14, n. 12 (15 giugno 2021): 3558. http://dx.doi.org/10.3390/en14123558.
Testo completoAbstract (sommario):
Open-pit mines can cause environmental changes, such as alterations of landscape structure, hydrology, air quality, and river sediments; they can also generate cones of depression. We propose a new method for surveys of mine waters using the example of an open-pit mine in central Poland. This study examines the correlations between bioluminescence and the color of brown coal mine waters and tests whether values of the three-color coordinate system reflected the physicochemical quality of mine waters measured in real-time and in the field. Our results show that alkalinity, pH reaction, and conductivity are higher in surface drainage, while values of trophic parameters (soluble reactive phosphates, total phosphorus, nitrates) are greater in samples representing subsurface drainage. Correlation analysis of bioluminescence with mine water quality parameters showed that only water color had a strong association with bioluminescence. This correlation is stronger for surface drainage, than for mine waters from subsurface drainage. Direct measurement of bioluminescence, resulting from adenosine 5`-triphosphate (ATP) using a luminometer, is a fast and reliable method for evaluation of the characteristics of mine waters in real-time.
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Valipour, Mohammad, Jens Krasilnikof, Stavros Yannopoulos, Rohitashw Kumar, Jun Deng, Paolo Roccaro, Larry Mays, Mark E. Grismer e Andreas N. Angelakis. "The Evolution of Agricultural Drainage from the Earliest Times to the Present". Sustainability 12, n. 1 (5 gennaio 2020): 416. http://dx.doi.org/10.3390/su12010416.
Testo completoAbstract (sommario):
Agricultural developments require changes in land surface and subsurface hydraulic functions as protection from floods, reclamation of flooded land, irrigation, and drainage. Drainage of agricultural land has a long history and apparently traces back to the earliest civilizations of Mesopotamia and Iran before 4000 BC. In the Eastern Mediterranean, the Minoan and Mycenaean civilizations developed techniques and strategies of drainage of agricultural lands from the middle of the 2nd millennium BC. After the collapse of the Aegean Bronze-age civilizations, society building and agricultural innovation in the archaic and Classical periods (ca. 800–300 BC) included successful attempts at controlling drainage and irrigation techniques. In addition, China, India, and Mesoamerica have extensive histories of drainage. The aim of this review paper is to trace the evolution of the main foundings on agricultural drainage technologies through the centuries until the present. This historical review reveals valuable insights into ancient hydraulic technologies as well as irrigation and drainage management that will help to find bright horizons for sustainable agriculture in future.
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Cahill, Brendan. "Characterizing Ireland's wave energy resource". Boolean: Snapshots of Doctoral Research at University College Cork, n. 2011 (1 gennaio 2011): 21–25. http://dx.doi.org/10.33178/boolean.2011.5.
Testo completoAbstract (sommario):
In theory, the energy that could be extracted from the oceans is well in excess of any current, or future, human requirements. While wave energy currently lags behind conventional, carbon based sources of power and other renewable sources of energy such as wind and solar, advances continue to be made. The developers of Wave Energy Converters (WECs), the devices that are designed to harness the power of ocean waves, require methods to compare and evaluate the wave energy resource at different locations in order to allow them to select the most suitable sites to achieve optimal power capture and economic performance from their installations. The focus of my Ph.D. research is towards developing new methods for characterizing the wave energy resource off the west coast of Ireland with reference to the potential power available and the performance of typical devices, and also to allow for the comparison of possible sites ...
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Hussein, Dildar, Khairol Amali Ahmad, Ahmad Zulhelmi Mat Nizan, Nazrul Fariq Makmor e Fakroul Ridzuan Hashim. "Vertical Axis Wind Turbine Application for Power Generation". Jurnal Kejuruteraan si4, n. 2 (31 ottobre 2021): 23–27. http://dx.doi.org/10.17576/jkukm-2021-si4(2)-04.
Testo completoAbstract (sommario):
Concerns over security for energy sources have led many countries to concentrate on obtaining renewable energy sources. In fact, Malaysia has also studied various alternative energy sources including wind energy. However, the terrain of Malaysia does not allow strong winds to move the wind turbines. Therefore, initial efforts to harness energy from the wind were not very successful. Therefore, this study has improved previous studies by highlighting the concept of vertical axis wind turbine using Magnus effect concept.
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Liu, Shiyang, Xuefu Zhang, Yuanfu Zhou e Feng Gao. "Optimization Study of Fluffy Materials Flocking Drainage Pipes to Resist Blockage Based on MD Binding Energy". Coatings 11, n. 7 (15 luglio 2021): 853. http://dx.doi.org/10.3390/coatings11070853.
Testo completoAbstract (sommario):
Drainage pipe blockage resulting from crystals is one of the causes for cracking and leakage of tunnel lining. Therefore, effective prevention from drainage pipe blockage caused by crystals is crucial to ensure the safety and stability of lining structures during the operation of tunnel drainage system. Based on a large number of indoor model tests and numerical simulation analyses, binding energy between four materials and the calcium carbonate aqueous solution (“solid + liquid” system) and that between the four materials and the two typical growth crystals of calcium carbonate (“solid + solid” system) were studied. The research results indicated that: (1) The four materials all had an adsorption effect on the calcium carbonate aqueous solution system, and the PA6 had the greatest adsorption effect while the PP had the smallest adsorption effect; (2) There was spontaneous adsorption between the PVC or PA6 and the two typical growth crystals of calcium carbonate and no adsorption between the PP or SiC and the two typical growth crystals of calcium carbonate unless external energy was in place; (3) The PP and SiC can be used as the materials for drainage pipe flocking, but it shall be ensured that the fluffy material has a good geometrical property. The prevention technology for crystallization that causes drainage pipe blockage fills the gap in the research of drainage pipe blockage caused by crystals, which can reduce the maintenance cost for the operation of the tunnel drainage system and ensure safe and normal operation of the tunnel.
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Saied, O., A. Abdellatif, S. Shaaban e A. F. Elsafty. "Efficient Energy Recovery Scenarios from Pressure-Reducing Stations Intended for New Al-Alamein City in Egypt". Energies 15, n. 23 (30 novembre 2022): 9077. http://dx.doi.org/10.3390/en15239077.
Testo completoAbstract (sommario):
Worldwide concerns over energy optimization and harnessing have sparked a variety of research on utilizing wasted energy. Natural gas, in particular, has been an essential energy commodity for domestic and industrial applications. This paper approaches the same principle throughout the Egyptian natural gas conventional national grid. The real case of Egypt’s Al-Alamein city gas line extension is analytically studied for energy harness. Thus, this paper aims to study the replacement of conventional energy-wasting pressure-reducing stations with power-producing expander generator systems to utilize pressure reduction in electricity generation. The mathematical equations that describe the energy recovery processes are presented. Reliable commercial software is used to verify the possible implementation of turbo expander stations in three scenarios. Each scenario is defined, and its main components and numerical parameters are introduced. Hence, the resulting energy outputs and applicability of all scenarios are compared to provide adequate energy recovery solutions.
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Maria-Arenas, Aleix, Aitor J. Garrido, Eugen Rusu e Izaskun Garrido. "Control Strategies Applied to Wave Energy Converters: State of the Art". Energies 12, n. 16 (14 agosto 2019): 3115. http://dx.doi.org/10.3390/en12163115.
Testo completoAbstract (sommario):
Wave energy’s path towards commercialization requires maximizing reliability, survivability, an improvement in energy harvested from the wave and efficiency of the wave to wire conversion. In this sense, control strategies directly impact the survivability and safe operation of the device, as well as the ability to harness the energy from the wave. For example, tuning the device’s natural frequency to the incoming wave allows resonance mode operation and amplifies the velocity, which has a quadratic proportionality to the extracted energy. In this article, a review of the main control strategies applied in wave energy conversion is presented along their corresponding power take-off (PTO) systems.
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Ilfan, Freddy, Ade Nurdin e Nadia Tristhayanti. "Evaluasi Kapasitas Saluran Drainase Sekunder di Jalan Kapten Pattimura Telanaipura Kota Jambi Menggunakan Software Hec-Ras". Jurnal Talenta Sipil 6, n. 1 (6 febbraio 2023): 44. http://dx.doi.org/10.33087/talentasipil.v6i1.213.
Testo completoAbstract (sommario):
One of the areas in Jambi City that experience drainage system problems are the Telanaipura area, precisely on Jalan Kapten Pattimura. The area around the research site is a densely populated area and there are several shopping centers, restaurants, and a fairly high road user. When there is a large rain or rain for a long enough time, this area is often flooded with water as high as 0.2 - 0.8 meters which can cause quite a lot of losses for local residents and also for business owners in the area. From this, it can be said that the drainage channel at this location is less than optimal for collecting and draining rainwater discharge. In this case, it is necessary to conduct a study of hydrological analysis and hydraulics analysis of the drainage channel which is useful in helping to solve the problems that occur. This study used hydrological data in the form of monthly rainfall for the past 10 years and the geometry of secondary drainage channels on Jalan Kapten Pattimura Telanaipura. The method used in this study is in the form of hydrological analysis with the maximum rainfall method, gumbel, and calculation of plan discharge with a rational method. This Hydraulic analysis carried out uses the help of the HEC-RAS program to simulate the discharge of water flow in the drainage. Based on the results of the analysis, it can be concluded that the secondary drainage channel of Jalan Kapten Pattimura, Telanaipura District, Jambi City, cannot accommodate the flow discharge of the plan for periods 2, 5, and 10 years. This is due to sedimentation, high rainfall, suboptimal drainage channels in accommodating flow discharge, and the presence of piles of garbage. The solution to this problem is to deepen the dimensions of the drainage channel by 40–135 cm deep.
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Takazawa, H., e T. Kajikawa. "Condensing Heat Transfer Enhancement on Vertical Spiral Double Fin Tubes With Drainage Gutters". Journal of Solar Energy Engineering 107, n. 3 (1 agosto 1985): 222–28. http://dx.doi.org/10.1115/1.3267682.
Testo completoAbstract (sommario):
Spiral double-fin tubes with drainage gutters are proposed for a vertical condenser to achieve high-condensing heat transfer performance for ocean thermal energy conversion application. There aluminum tubes have 5 or 10 spiral primary fins per pitch of spiral drainage fin. The condensation occurs mainly on the 0.8-mm-high primary fins; the 2-mm-high drainage fin collects the condensate from the primary fins, and a vertical drainage gutter removes the condensate from the drainage fin. Thus performance degradation due to accumulation of condensate in the vertical direction is avoided. Experiments were carried out using R-22 (chlorodifluromethane) as the working fluid in a shell using seven aluminum tubes (900 mm in effective length and 20 mm in nominal diameter). The drainage fin pitch, the primary fin pitch, shape of primary fin, and number of drainage gutters per tube were selected as parameters. One of the tubes had a 0.2-mm-thick titanium cladding on the inside (water side). The measured working-fluid-side condensing heat transfer coefficients for these tubes were four to six times those for a smooth tube based on the outer surface area.
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Ravi S. Gonella e Pratik N. Rao. "Part-1: 5X Definitions of hydrogen and renewable energy latex and their importance". International Journal of Science and Research Archive 9, n. 1 (30 maggio 2023): 001–12. http://dx.doi.org/10.30574/ijsra.2023.9.1.0345.
Testo completoAbstract (sommario):
Hydrogen, the emerging zero carbon spectrum fuel that gears residential, commercial and industrial capacities across the world chasing COP 27 to NetZero. It is therefore essential to promulgate the awareness to societies and harness the Greenhouse emissions (GHG) from conventional sources. The hydrogen & renewable energies are breve raged to 40% by 2040 giving protection to Climate & environment that are susceptible to nature. In this paper are highlighted few definitions to beginners who shall revitalize the fuels and technologies of today and tomorrow.
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Wong, Wilson Kia Onn. "Creating “Artificial Suns”: the Sino-Western race to master limitless clean energy through nuclear fusion". Asian Education and Development Studies 12, n. 1 (29 dicembre 2022): 28–39. http://dx.doi.org/10.1108/aeds-03-2022-0035.
Testo completoAbstract (sommario):
PurposeThis paper aims to examine the intensifying efforts by China and the West to harness the clean, limitless energy of nuclear fusion. However, it argues that this “holy grail” of a fusion future is only achievable through an optimal combination of mission-oriented public–private cooperation and genuine intergovernmental cooperation.Design/methodology/approachThis study deploys a case-study approach, augmented by relevant literature, to analyse the advances in fusion technology.FindingsDespite purported recent advances in fusion technology, these advances remain largely “proof of concept” experiments rather than commercially viable technologies that enable us to truly harness the infinite power of these “artificial suns”. To achieve the moonshot goal of delivering practicable “net energy gain” from fusion power, this study advocates shedding hubristic political “one-upmanship” amongst rival governments. Further, it urges focussing the ingenuity, along with the financial and scientific resources of all stakeholders (both public and private) across the globe to bring about this “fusion dawn”. Moreover, efforts to deliver fusion power face significant competition from other clean energy sources (wind, solar power and nuclear fission reactors) that are not only technically far less challenging but also economically more viable with their declining cost structures.Originality/valueThis study is possibly one of the few social science papers that examines the prospect of clean, limitless fusion power along with the challenges it faces and its societal implications.
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Chandra, Rashmi, J. Annie Modestra e S. Venkata Mohan. "Biophotovoltaic cell to harness bioelectricity from acidogenic wastewater associated with Microbial Community Profiling". Fuel 160 (novembre 2015): 502–12. http://dx.doi.org/10.1016/j.fuel.2015.07.090.
Testo completo
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Blanch, M. J. "Wind Energy Technologies for use in the Built Environment". Wind Engineering 26, n. 3 (maggio 2002): 125–43. http://dx.doi.org/10.1260/030952402762056054.
Testo completoAbstract (sommario):
Technologies are being developed to harness power from the wind using buildings. These are described with their current stage of development and with the plans and possibilities of further developments. These technologies may be able to make valuable contributions to the renewable component of an urban area's power supply. This new market is potentially enormous. Feeding power directly into the building's own electrical circuits avoids costs otherwise associated with a separate connection to the local utility electrical distribution network. The economic value of the energy is equal to that otherwise charged by the client's electrical supplier, which is considerably higher than would normally be paid for wind energy supplied directly to the grid.
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Filik, Kamil, Sebastian Hajder e Grzegorz Masłowski. "Multi-Stroke Lightning Interaction with Wiring Harness: Experimental Tests and Modelling". Energies 14, n. 8 (9 aprile 2021): 2106. http://dx.doi.org/10.3390/en14082106.
Testo completoAbstract (sommario):
This paper presents the obtained results of experimental tests and modelling of lightning disturbances that were propagated in a model of aircraft cable bundle and caused by multiple lightning return-strokes interactions. The work is a continuation of previous research, which was concerned mainly with the interaction of lightning discharge with a single return-stroke. The section of the cable harness arranged above the metal plate was investigated. In one of its wires, a multiple-stroke current representing indirect lightning effects was injected from an impulse current generator dedicated to avionics immunity tests. Overvoltages induced at the ends of other wires surrounded by a braided shield, as well as the influence of line parameters and shield grounding condition on the shape and level of observed transients, were examined. The computer simulation results match the measurement data with satisfactory accuracy, and therefore, the presented model can be used to estimate indirect lightning effects in the wiring harness of avionics.
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Putra Bahtiar Maulana e Asri Sawiji. "A study on the potential of electricity generation from wave energy in Pelabuhan Ratu, Sukabumi". Journal of Marine Resources and Coastal Management 2, n. 2 (30 agosto 2021): 6–10. http://dx.doi.org/10.29080/mrcm.v2i2.1285.
Testo completoAbstract (sommario):
Pelabuhan Ratu is an area that has high wave energy potential and can be used as renewable energy. Wave energy harness the power of ocean waves into an electrical energy. The purpose of this research is to estimate the potential of wave energy in the month of Muharram and Rajab (Islamic/Hijriyah calendar) in the year 2018. It is based on local communities beliefs that the Muharram month has a high wave characteristic, and in this study compared with Rajab, the other month in Hijriyah calendar. The value of the forecasting waves in Muharram has a higher value compared to the Rajab. The estimated value of the power generated in the Muharram of 634.205 KWatt, whereas in the Rajab of 119.563 KWatt. The value is influenced to the fetch length. This wave energy potential then can be used to estimate the electrical power generated and the effect of the turbine on the application of the Oscillating Water Column (OWC) system.
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SUN, T., P. MEAKIN e T. JØSSANG. "A MINIMUM ENERGY DISSIPATION MODEL FOR RIVER NETWORKS AND THEIR ASSOCIATED TOPOGRAPHIES". Fractals 01, n. 03 (settembre 1993): 576–84. http://dx.doi.org/10.1142/s0218348x93000605.
Testo completoAbstract (sommario):
The model for the river networks presented here is based on minimum energy dissipation principles. The foundation for this model is the empirical relationship s~Qα between the link slope s in channel networks and the mean annual discharge Q in that link. The associated landscapes were constructed using a range of values for the exponent α. The surfaces appear to be more complex than simple self-affine fractals. The boundaries of drainage basins covering the entire drainage area were found to have an effective fractal dimension about 1.10 for all values of α in the range −1<α<0. A universal power-law size (area) distribution is also found for the drainage basins obtained from this minimum energy dissipation model.
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Yaseen. H. Mahmood e Mayadah K h. Ghaffar. "Design of Solar dish concentration by using MATLAB program and Calculation of geometrical concentration parameters and heat transfer". Tikrit Journal of Pure Science 20, n. 4 (10 febbraio 2023): 101–6. http://dx.doi.org/10.25130/tjps.v20i4.1220.
Testo completoAbstract (sommario):
Renewable energy sources plays an important role in electricity generation. Various renewable energy sources like wind, solar, geothermal, ocean thermal, and biomass can be used for generation of electricity and for meeting our daily energy needs. Energy from the sun is the best option for electricity generation as it is available everywhere and is free to harness. The goal of research is to calculate the energy, engineering characteristics of solar concentrators by writing their own equations MATLAB program and compare the theoretical results with the results of the researchers was compatible.
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Schlau-Cohen, G. S. "Principles of light harvesting from single photosynthetic complexes". Interface Focus 5, n. 3 (6 giugno 2015): 20140088. http://dx.doi.org/10.1098/rsfs.2014.0088.
Testo completoAbstract (sommario):
Photosynthetic systems harness sunlight to power most life on Earth. In the initial steps of photosynthetic light harvesting, absorbed energy is converted to chemical energy with near-unity quantum efficiency. This is achieved by an efficient, directional and regulated flow of energy through a network of proteins. Here, we discuss the following three key principles of this flow and of photosynthetic light harvesting: thermal fluctuations of the protein structure; intrinsic conformational switches with defined functional consequences; and environmentally triggered conformational switches. Through these principles, photosynthetic systems balance two types of operational costs: metabolic costs, or the cost of maintaining and running the molecular machinery, and opportunity costs, or the cost of losing any operational time. Understanding how the molecular machinery and dynamics are designed to balance these costs may provide a blueprint for improved artificial light-harvesting devices. With a multi-disciplinary approach combining knowledge of biology, this blueprint could lead to low-cost and more effective solar energy conversion. Photosynthetic systems achieve widespread light harvesting across the Earth's surface; in the face of our growing energy needs, this is functionality we need to replicate, and perhaps emulate.
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Wang, Zhuo Ying. "Research on Energy Saving for the Case Analysis of Building Energy Conservation in Xichang City". Advanced Materials Research 886 (gennaio 2014): 478–83. http://dx.doi.org/10.4028/www.scientific.net/amr.886.478.
Testo completoAbstract (sommario):
Through the example of residential building energy conservation and emissions reduction of a residential district building project, the article analyses that building energy conservation can be considered from the aspects of construction site selection, layout; Retaining structure technology solutions; HVAC technology solutions; Electric system technology solutions; Water supply and drainage system technology solutions.
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Ruzlaini Ghoni, Mohd Tarmizi Ibrahim, Nik Fakhri Nek Daud, Ammar Husaini Hussian, Shaiful Rizalmee Wahid, Ahmad Farid Ridhwan Zakaria e Hamdan Azmi Abdul Aziz. "The Cutting Edge of Vibration Energy Harvesting Technology". Advanced Research in Applied Sciences and Engineering Technology 30, n. 1 (8 marzo 2023): 168–84. http://dx.doi.org/10.37934/araset.30.1.168184.
Testo completoAbstract (sommario):
Energy harvesting has been around for more than a decade, with continual research tackling the issues of charging and powering up electronic gadgets. Because of its multiple advantages, such as greater mobility and a longer lifespan, the notion of energy harvesting has acquired broad popularity. Researchers are investigating methods to harness the energy created by vibrations from various materials and transducers as part of the energy conservation movement. This paper examines major advancements in vibration energy collecting during the last 15 years. It focuses on the many processes used to collect vibration energy, such as piezoelectric, electromagnetic, electrostatic generators, and MEMs techniques, as well as power management circuits, to enhance various elements of vibration energy harvesting devices from diverse sources. While the research on vibration energy harvesting has grown significantly, this work summarises significant achievements in the subject over the last 15 years and updates prior review publications.
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Alami, Abdul Hai. "Assessment of Using Secondary Concentrators for Nonferrous Material Removal Applications". Advanced Materials Research 939 (maggio 2014): 506–13. http://dx.doi.org/10.4028/www.scientific.net/amr.939.506.
Testo completoAbstract (sommario):
The paper investigates using a secondary solar concentrator to augment the solar energy density focused by a primary concentrator (a paraboloid dish). The secondary concentrator protects the focal point from cooling by convection from wind, and also would harness all the solar rays reflected by the primary concentrator, resulting in reduced losses due to aberration and other errors in finding the focal point. The intended application is the utilization of solar energy for nonferrous material ablation that could potentially replace or assist industrial lasers
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Seto, Mayumi, e Yoh Iwasa. "Microbial material cycling, energetic constraints and ecosystem expansion in subsurface ecosystems". Proceedings of the Royal Society B: Biological Sciences 287, n. 1931 (29 luglio 2020): 20200610. http://dx.doi.org/10.1098/rspb.2020.0610.
Testo completoAbstract (sommario):
To harvest energy from chemical reactions, microbes engage in diverse catabolic interactions that drive material cycles in the environment. Here, we consider a simple mathematical model for cycling reactions between alternative forms of an element (A and A e ), where reaction 1 converts A to A e and reaction 2 converts A e to A. There are two types of microbes: type 1 microbes harness reaction 1, and type 2 microbes harness reaction 2. Each type receives its own catabolic resources from the other type and provides the other type with the by-products as the catabolic resources. Analyses of the model show that each type increases its steady-state abundance in the presence of the other type. The flux of material flow becomes faster in the presence of microbes. By coupling two catabolic reactions, types 1 and 2 can also expand their realized niches through the abundant resource premium, the effect of relative quantities of products and reactants on the available chemical energy, which is especially important for microbes under strong energetic limitations. The plausibility of mutually beneficial interactions is controlled by the available chemical energy (Gibbs energy) of the system. We conclude that mutualistic catabolic interactions can be an important factor that enables microbes in subsurface ecosystems to increase ecosystem productivity and expand the ecosystem.
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Sobaga, Antoine, Bertrand Decharme, Florence Habets, Christine Delire, Noële Enjelvin, Paul-Olivier Redon, Pierre Faure-Catteloin e Patrick Le Moigne. "Assessment of the interactions between soil–biosphere–atmosphere (ISBA) land surface model soil hydrology, using four closed-form soil water relationships and several lysimeters". Hydrology and Earth System Sciences 27, n. 13 (4 luglio 2023): 2437–61. http://dx.doi.org/10.5194/hess-27-2437-2023.
Testo completoAbstract (sommario):
Abstract. Soil water drainage is the main source of groundwater recharge and river flow. It is therefore a key process for water resource management. In this study, we evaluate the soil hydrology and the soil water drainage, simulated by the interactions between soil–biosphere–atmosphere (ISBA) land surface model currently used for hydrological applications from the watershed scale to the global scale, where parameters are generally not calibrated. This evaluation is done using seven lysimeters from two long-term model approach sites measuring hourly water dynamics between 2009 and 2019 in northeastern France. These 2 m depth lysimeters are filled with different soil types and are either maintained as bare soil or covered with vegetation. Four closed-form equations describing soil water retention and hydraulic conductivity functions are tested, namely the commonly used equations from Brooks and Corey (1966) and van Genuchten (1980), a combination of the van Genuchten (1980) soil water retention function with the Brooks and Corey (1966) unsaturated hydraulic conductivity function, and, for the very first time in a land surface model (LSM), a modified version of the van Genuchten (1980) equations, with a new hydraulic conductivity curve proposed by Iden et al. (2015). The results indicate good performance by ISBA with the different closure equations in terms of soil volumetric water content and water mass. The drained flow at the bottom of the lysimeter is well simulated, using Brooks and Corey (1966), while some weaknesses appear with van Genuchten (1980) due to the abrupt shape near the saturation of its hydraulic conductivity function. The mixed form or the new van Genuchten (1980) hydraulic conductivity function from Iden et al. (2015) allows the solving of this problem and even improves the simulation of the drainage dynamic, especially for intense drainage events. The study also highlights the importance of the vertical heterogeneity of the soil hydrodynamic parameters to correctly simulate the drainage dynamic, in addition to the primary influence of the parameters characterizing the shape of the soil water retention function.
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Borowski, Marek, Piotr Życzkowski, Klaudia Zwolińska, Rafał Łuczak e Zbigniew Kuczera. "The Security of Energy Supply from Internal Combustion Engines Using Coal Mine Methane—Forecasting of the Electrical Energy Generation". Energies 14, n. 11 (24 maggio 2021): 3049. http://dx.doi.org/10.3390/en14113049.
Testo completoAbstract (sommario):
Increasing emissions from mining areas and a high global warming potential of methane have caused gas management to become a vital challenge. At the same time, it provides the opportunity to obtain economic benefits. In addition, the use of combined heat and power (CHP) in the case of coalbed methane combustion enables much more efficient use of this fuel. The article analyses the possibility of electricity production using gas engines fueled with methane captured from the Budryk coal mine in Poland. The basic issue concerning the energy production from coalbed methane is the continuity of supply, which is to ensure the required amount and concentration of the gas mixture for combustion. Hence, the reliability of supply for electricity production is of key importance. The analysis included the basic characterization of both the daily and annual methane capture by the mine’s methane drainage system, as well as the development of predictive models to determine electricity production based on hourly capture and time parameters. To forecast electricity production, predictive models that are based on five parameters have been adopted. Models were prepared based on three time variables, i.e., month, day, hour, and two values from the gas drainage system-capture and concentration of the methane. For this purpose, artificial neural networks with different properties were tested. The developed models have a high value of correlation coefficient. but showed deviations concerning the very low values persisting for a short time. The study shows that electricity production forecasting is possible, but it requires data on many variables that directly affect the production capacity of the system.
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Chandrasekaran, Srinivasan, e Harender. "Power Generation Using Mechanical Wave Energy Converter". International Journal of Ocean and Climate Systems 3, n. 1 (marzo 2012): 57–70. http://dx.doi.org/10.1260/1759-3131.3.1.57.
Testo completoAbstract (sommario):
Ocean wave energy plays a significant role in meeting the growing demand of electric power. Economic, environmental, and technical advantages of wave energy set it apart from other renewable energy resources. Present study describes a newly proposed Mechanical Wave Energy Converter (MEWC) that is employed to harness heave motion of floating buoy to generate power. Focus is on the conceptual development of the device, illustrating details of component level analysis. Employed methodology has many advantages such as i) simple and easy fabrication; ii) easy to control the operations during rough weather; and iii) low failure rate during normal sea conditions. Experimental investigations carried out on the scaled model of MWEC show better performance and its capability to generate power at higher efficiency in regular wave fields. Design Failure Mode and Effect Analysis (FMEA) shows rare failure rates for all components except the floating buoy.
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KONDRATENKO, V., V. KALINICHENKO, e O. KOLLAROV. "Improving the methodology for calculating mine precinct drainage plants." Journal of Electrical and power engineering 14, n. 1 (27 febbraio 2020): 81–84. http://dx.doi.org/10.31474/2074-2630-2020-1-81-84.
Testo completoAbstract (sommario):
Drainage plants consume more than 30% of the electricity consumed by all of the mine's electromechanical equipment. Therefore, mine drainage installations must have high energy efficiency and reliability. An analysis of the operation of the existing drainage installations shows that the pumps are selected with an overpressure. As a result, cavitation occurs in the pumps. It is established that 60-70% of the drainage plants operate in cavitation modes and have a reduced efficiency and correspondingly higher electricity consumption. Known methods for calculating mine drainage installations have the disadvantages, first of all, that they allow the pump to operate in the working area much higher than the rated regime. Pump operation at higher than the nominal supply significantly impairs its energy and cavitation characteristics. An improved method of calculating mine drainage facilities is proposed, through the introduction of additional dependencies and provisions that will increase the energy efficiency of the equipment. The article presents theoretical studies of local resistance of the pipeline of drainage installations. As a result of the research, analytical dependences of the local resistance of the mesh suction valve and the check valve on the diameter of the pipeline were obtained. On the basis of these dependencies an equation is obtained that relates the nominal parameters of the pump and the geometric height of water rise from the inner diameter of the pipeline. This equation is recommended to be used in the calculation of mine district water drainage installations to improve their energy efficiency at the design stage.
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Odumesi, John O., e Bayonle S. Sanusi. "Achieving Sustainable Development Goals from a Cybersecurity Perspective". Advances in Multidisciplinary and scientific Research Journal Publication 2, n. 1 (30 luglio 2023): 1–10. http://dx.doi.org/10.22624/aims/csean-smart2023p3.
Testo completoAbstract (sommario):
& Department of Computer Science, University of Abuja, Nigeria Global Digital Innovation (GDI-GITTP), Korea Advance Institute of Science and Technology (KAIST), South Korea E-mails: olayemijohn@yahoo.com; boyorules@gmail.com ABSTRACT Rapid digitalisation and society's interconnection have provided both opportunities and problems for sustainable development, as such, this paper aims to understand how cybersecurity measures might help achieve Sustainable Development Goals (SDGs). As more critical infrastructure, key services, and personal data are kept and sent via digital networks, the significance of cybersecurity in accomplishing the SDGs becomes clear. Through a comprehensive literature review, the paper analyses the role of cybersecurity in enhancing economic growth, promoting social inclusivity, and safeguarding environmental sustainability. The paper thoroughly analyses the seventeen (17) SDGs listed by the United Nations (UN) and their underlying goals. The paper looks at how cybersecurity relates to the SDGs, emphasising potential synergies and interdependencies. Finally, this paper emphasises the critical importance of recognising the interdependence between cybersecurity and sustainable development. By mapping cybersecurity with the SDGs, societies can harness the transformative power of digital technologies to build a secure, inclusive, and sustainable future for all. Keywords: SDGs, Cybersecurity, Personal Data, Critical Infrastructure, United Nations, Cyber Threats Proceedings Citation Format Odumesi, J.O. & Sanusi, B.S. (2023): Achieving Sustainable Development Goals from a Cybersecurity Perspective. Proceedings of the Cyber Secure Nigeria Conference. Nigerian Army Resource Centre (NARC) Abuja, Nigeria. 11-12th July, 2023. Pp 1-10 https://www.csean.org.ng/. dx.doi.org/10.22624/AIMS/CSEAN-SMART2023P3