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  • Articles  (18)
  • Solar energy technologies  (7)
  • Agricultural Extension Services  (6)
  • Agribusiness, Q18 - Agricultural Policy  (5)
  • Oxford University Press  (18)
  • American Chemical Society (ACS)
  • American Physical Society
  • American Physical Society (APS)
  • Hindawi
  • Institute of Physics
  • Public Library of Science
  • 2020-2024
  • 2015-2019  (18)
  • 1985-1989
  • 1940-1944
  • 2015  (18)
  • 1945
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (11)
  • Energy, Environment Protection, Nuclear Power Engineering  (7)
  • Electrical Engineering, Measurement and Control Technology
Collection
  • Articles  (18)
Source
Keywords
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  • Oxford University Press  (18)
  • American Chemical Society (ACS)
  • American Physical Society
  • American Physical Society (APS)
  • Hindawi
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Years
  • 2020-2024
  • 2015-2019  (18)
  • 1985-1989
  • 1940-1944
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  • 1
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    Exploring the Role of Incentives in Agricultural Extension Programs (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-11
    Description: While many governments subsidize extension programs, financial incentives for participation in extension programs are rare and little is known about such initiatives. This article assesses whether a financial incentive for an agricultural extension program for dairy farmers in Ireland has an impact on the type of farmer that participates in extension services. The findings reveal that financial incentives encourage participation, especially with cohorts of farmers that previously eschewed such programs. Several aspects of the overall economic effectiveness of the extension program are discussed and policy recommendations are outlined.
    Keywords: Q12 - Micro Analysis of Farm Firms, Farm Households, and Farm Input Markets, Q16 - R&D ; Agricultural Technology ; Agricultural Extension Services
    Print ISSN: 2040-5790
    Electronic ISSN: 2040-5804
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 2
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    Towards the generation of distributed electric power: self-consumption with net balance (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-16
    Description: The results and considerations on one self-consumption photovoltaic installation with net balance in Granada (South of Spain) are presented and discussed in this paper. The use of the building (one faculty) makes it optimal for this kind of consumption. Finally, the potential benefits and problems of self-consumption with net balance are presented.
    Keywords: Solar energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 3
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    Theoretical investigation of hot box solar cookers having conventional and finned absorber plates (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-16
    Description: In this paper, solar box cookers with ordinary and finned absorber plates are theoretically investigated in terms of thermodynamic performance parameters. For a typical summer and winter day, temperatures of solar cooker components such as glass cover, internal air, absorber plate, cooking vessel and the liquid are determined theoretically versus time. The analysis is carried out for conventional and finned absorber plates, and accuracy of the results is verified by a previously published experimental work. Energy and exergy efficiencies of box-type solar cookers are plotted versus time for various cases. The methodology presented in this paper enables to make a preliminary evaluation of ordinary and modified solar box cookers with respect to changes in main environmental parameters such as temperature and illumination intensity. Some recommendations are also made to enhance the power outputs of the aforementioned solar cookers.
    Keywords: Solar energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 4
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    Design of a celestial vault image capture device for its application in the solar radiation field (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-16
    Description: The sun is the more plentiful source of natural power that we have in the Earth. However, the amount of radiation reaching the Earth's surface depends on astronomical and climatic factors. One of the factors exerting a greater influence is cloudiness. For that reason, it is important to quantify its influence on solar radiation. According to that, in this work, a prototype to capture images of the celestial vault is designed and implemented to be able to measure parameters related to the cloud properties and, later, to determine their influence on solar radiation.
    Keywords: Solar energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 5
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    Investigation of concentrating and nonconcentrating evacuated tube solar water heaters using 2D particle imaging velocimetry (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-16
    Description: Under transient climatic conditions, solar water heaters using heat pipes are more effective at capturing incident solar radiation than other equivalent sized solar water heaters. The cost must be reduced to improve uptake of such systems. To investigate two methods were considered by this study: thermosyphon fluid flow and reflective concentrators. A physical reconfigurable laboratory model of the manifold and associated condensers of a heat-pipe-evacuated tube system were fabricated; fluid circulation was via thermosyphonic action, particle imaging velocimetry derived velocity maps and the use of concentrators was simulated. When condenser spacing was doubled, the Nusselt number increased by 43%, the velocity by 55% but the heat transfer efficiency of the model manifold decreased by 9%. Potential annual energy savings of 10 207 GWh could be realized if such systems could be successfully fabricated.
    Keywords: Solar energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 6
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    Decomposing the Farmer's Share of the Food Dollar (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-12
    Description: The Canadian farm share for five crop-based products and seven livestock-based products from 1997 to 2010 is calculated using a supply chain IO analysis. Significant differences exist in farm shares across food commodities with higher farm shares for livestock products and lower farm shares for grain-based products. The decline in the Canadian farm share for food consumed at home is driven in large part by the food purchasing habits of consumers. This paper also addresses the hypothesis that the decline in the Canadian farm share could be partially driven by rising input costs in post-farmgate processes or rising input costs that have greater impact on downstream sectors than primary agricultural producers. Three experiments were conducted to assess the impact of an increase in the cost of corn, energy, and farm labor would have on commodity output prices, farm returns, food expenditure, and farm share. In all three cases, the overall farm share increases, albeit by a small amount, suggesting that these shocks have a larger relative impact on the prices of agricultural commodities than the prices of marketing commodities used in post-farmgate activities. A two-period comparison of these simulations shows that energy (corn and farm labour) price shocks would have had a greater (lower) impact on the farm share in 2007 than 1997.
    Keywords: Q11 - Aggregate Supply and Demand Analysis ; Prices, Q13 - Agricultural Markets and Marketing ; Cooperatives ; Agribusiness, Q18 - Agricultural Policy ; Food Policy
    Print ISSN: 2040-5790
    Electronic ISSN: 2040-5804
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 7
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    Solar low-pressure turbo-ejector Maisotsenko cycle-based power system for electricity, heating, cooling and distillation (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-13
    Description: The article describes the innovative solutions of power, heating and cooling generation utilizing low- or medium-grade heat sources. The proposed technology based on the well-known irreversible Brayton cycle and the revolutionary Maisotsenko cycle (M-cycle) operates at atmospheric or sub-atmospheric pressures. Such energetic systems are simple and reliable and utilize moisture-saturated air as a working fluid. The ejector replacing the mechanical compressor in the Brayton cycle system allows increasing the cycle work by three to five times at the constant airflow. At the same time, the utilized heat serves for simultaneous heating and cooling production that makes the system economically viable and environmentally friendly with the increased integral performance. For system's performance improvement, the schematic and the cycle were upgraded allowing the off-the-shelf components to be employed and replace the electrically driven fan with fluidic jet-fan that served for energy saving of the innovative turbo-ejector system operation.
    Keywords: Solar energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 8
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    Intellectual property in plant breeding: comparing different levels and forms of protection (2015)
    Oxford University Press
    Details
    Publication Date: 2015-12-29
    Description: Welfare trade-offs between intellectual property (IP) protections provided by patents and by plant variety protection (PVP) are explored. PVP breeders’ exemption weakens IP protection, but may speed the transfer of research gains across firms. A model is developed assuming firms optimise research given existing IP protection. A baseline scenario supporting each system is used to perform welfare analysis, and study how the balance is altered between systems. Survey data suggest patents are more appropriate for longer-term, higher-risk research, whereas PVP is better suited for traditional breeding. A scenario where patents and licensing co-exist dominates PVP in all commercially relevant areas.
    Keywords: O31 - Innovation and Invention: Processes and Incentives, O34 - Intellectual Property Rights, Q16 - R&D ; Agricultural Technology ; Agricultural Extension Services
    Print ISSN: 0165-1587
    Electronic ISSN: 1464-3618
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 9
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    Extension and Matching Grants for Improved Management: An Evaluation of the Uruguayan Livestock Program (2015)
    Oxford University Press
    Details
    Publication Date: 2015-12-13
    Description: Offering matching grants along with extension services is a common tool of agricultural development policy and has the potential to address some of the shortcomings of purely private or public extension. Yet the evidence for the effectiveness of programs that combine extension with matching grants is quite thin. We add to this evidence by evaluating the Uruguayan Livestock Program (ULP), a program that promoted the adoption of intensive management practices by small and medium-sized cattle producers by offering extension from private providers combined with matching grants for investments. Using inverse probability weighting as applied to an eight-year panel data set of cattle producers, we find that the ULP had large impacts on net sales and production of calves, but that program impacts on production and sales translated into modest net economic impacts overall. We examine the mechanisms that may have driven ULP impacts, and conclude that program impacts were likely caused by improved management practices rather than by loosening liquidity constraints on producers.
    Keywords: O13 - Agriculture ; Natural Resources ; Energy ; Environment ; Other Primary Products, O22 - Project Analysis, Q12 - Micro Analysis of Farm Firms, Farm Households, and Farm Input Markets, Q16 - R&D ; Agricultural Technology ; Agricultural Extension Services
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 10
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    Following Up on Smallholder Farmers and Supermarkets in Kenya (2015)
    Oxford University Press
    Details
    Publication Date: 2015-07-10
    Description: In many developing countries, supermarkets are expanding rapidly. This affects farmers’ marketing options. Previous studies have analyzed welfare effects of smallholder participation in supermarket channels from a static perspective, using cross-section data. We develop a conceptual framework and use panel data to better understand participation and impact dynamics. The analysis focuses on vegetable producers in Kenya. Participation in supermarket channels is associated with income gains. However, many farmers have dropped out of the supermarket channel due to various constraints. The initial income gains cannot be sustained when returning to the traditional market. Organizational support may be needed to avoid widening income disparities.
    Keywords: L24 - Contracting Out ; Joint Ventures ; Technology Licensing, O12 - Microeconomic Analyses of Economic Development, O13 - Agriculture ; Natural Resources ; Energy ; Environment ; Other Primary Products, Q12 - Micro Analysis of Farm Firms, Farm Households, and Farm Input Markets, Q13 - Agricultural Markets and Marketing ; Cooperatives ; Agribusiness, Q18 - Agricultural Policy ; Food Policy
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 11
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    Urban forests and solar power generation: partners in urban heat island mitigation (2015)
    Oxford University Press
    Details
    Publication Date: 2015-02-12
    Description: The urban forest is generally decreasing in areal extent. At the same time, human population is urbanizing and urban areal extent per capita is increasing. Eighty percent of North Americans are now living in urbanized areas. Urban forests directly affect quality of life for residents of cities via the ecosystem services and psychosocial restoration they provide. The urban forest canopy is a key component of reducing the urban heat island, slowing stormwater runoff and making urban environments more efficient and livable. Municipalities in North America are reacting to concerns about urbanization and economic trends by permitting an increasing number of compact developments that may conflict with beneficial Green Infrastructure. Compact development may also present challenges to solar access for solar power generation. This paper identifies and illustrates key strategies to increase urban forest cover and decrease infrastructure conflicts by implementing given innovative design details, detailing specific zoning and code language, and providing best practices from multiple disciplines. These strategies to increase urban forest canopy cover frame a coherent set of ideas to decrease the effects of the urban heat island, increase solar power generation and improve urban quality of life in cities.
    Keywords: Solar energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 12
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    A Triple-Hurdle Model of Production and Market Participation in Kenya's Dairy Market (2015)
    Oxford University Press
    Details
    Publication Date: 2015-07-10
    Description: Existing analyses of market participation are based on a "double-hurdle" modeling approach. Such models are appropriate only when all members of the population of interest actually produce the good. In some contexts, however (e.g., smallholder farmers), many members of the population do not produce particular goods that they could produce and that their neighbors do produce. Policies influencing market participation among producers may thus also induce additional farmers to become producers. Previous double-hurdle approaches do not allow explicitly for this possibility. To address these limitations, this article presents a "triple-hurdle" approach with an initial stage that includes nonproducers. The model is used to identify the factors associated with Kenyan smallholder farmers choosing to participate in dairy production, and the role that these producers choose to play (or not) in the marketplace. In the midst of debates underway over the privatization of the parastatal Kenya Creameries Company, new knowledge about smallholder participation in dairy could be an important contribution. Results suggest the importance of rural electrification, training, and improved grazing practices. We find that expected net sales are significantly higher when farmers have access to informal private markets. We also describe a version of the ordered tobit model that includes nonproducers and is nested in our triple-hurdle model. A likelihood ratio test shows the latter to be a significantly better fit to our data. We discuss how insights gained from this study differ from the insights that would come from a double-hurdle ordered tobit that also includes nonproducers.
    Keywords: C51 - Model Construction and Estimation, C81 - Methodology for Collecting, Estimating, and Organizing Microeconomic Data, O12 - Microeconomic Analyses of Economic Development, Q13 - Agricultural Markets and Marketing ; Cooperatives ; Agribusiness, Q18 - Agricultural Policy ; Food Policy
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 13
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    What Happens When Food Marketers Require Restrictive Farming Practices? (2015)
    Oxford University Press
    Details
    Publication Date: 2015-07-10
    Description: The dimensions that define a food product have expanded rapidly to include characteristics of the production process, marketing arrangements, and implications that production and consumption of the product have for the environment. Some market intermediaries have responded by requiring that their suppliers abide by restrictive production practices. We examine the economic effects of such restrictions and apply this analysis to limitations on the use of antibiotics in U.S. pork production. Results from conceptual and simulation analyses show that, in the absence of demand growth, less pork is sold due to higher costs in the restricted segment, and both pork consumers (on average) and producers are harmed. Demand growth of between 6–11% from adding new consumers who will consume the restricted (antibiotic-free) product but not the conventional product is needed to return consumer surplus to the level in the base case, and between 2–4% demand growth was required to return producer surplus to base. When restricted and conventional products are modeled using a vertical differentiation framework, results depend importantly on the ease with which consumers can switch to a seller who offers their desired product type. Significant distributional impacts among consumers are present when switching costs are prohibitive.
    Keywords: I18 - Government Policy ; Regulation ; Public Health, Q13 - Agricultural Markets and Marketing ; Cooperatives ; Agribusiness, Q18 - Agricultural Policy ; Food Policy
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 14
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    Long-run and Global R&D Funding Trajectories: The U.S. Farm Bill in a Changing Context (2015)
    Oxford University Press
    Details
    Publication Date: 2015-09-12
    Description: Domestically funded (and performed) research and development (R&D) has historically been a major source of productivity gains in U.S. agriculture, and a principal source of R&D spillovers to the rest of the world. In the waning decades of the 20th century, U.S. policymakers opted to ratchet down the rate of growth in public support for food and agricultural R&D. As the 21st century unfolds, slowing growth has given way to real cutbacks, reversing the accumulation of U.S.-sourced public R&D capital over most of the previous century and more. The 2014 Farm Bill did little to reverse these long-run research funding trajectories—politicians failed to heed the economic evidence about the still substantial social payoffs of that research and the consequent slowdown in U.S. agricultural productivity growth associated with the spending slowdown. Meanwhile, R&D spending by other countries has been moving in different directions. We present new evidence that today's middle-income countries—notably China, Brazil, and India— are not only growing in relative importance as producers of agricultural innovations through investments in public R&D, they are also gaining considerable ground in terms of their share of privately performed research of relevance for agriculture. The already substantive changes in global public and private R&D investment trajectories are accelerating. If history is any guide to the future, these changing R&D trajectories could have profound consequences for the competitiveness of U.S. agriculture in the decades ahead.
    Keywords: O38 - Government Policy, Q16 - R&D ; Agricultural Technology ; Agricultural Extension Services
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 15
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    Estimating Yield Gaps With Limited Data: An Application to United States Wheat (2015)
    Oxford University Press
    Details
    Publication Date: 2015-09-12
    Description: The objective of this research is to estimate and analyze the gap between in-trial yield potential, on-farm yield potential, and actual on-farm wheat yields. Yield gaps are quantified by measuring how varietal mean yields have changed over time, due to productivity increases generated by public and private wheat breeding programs. Variety performance trial data for Kansas winter wheat are used to summarize the evolution of wheat yields over the time period 1985 to 2011. A measure of yield potential is compared to actual on-farm yields to derive implications for wheat industry stakeholders. Persistent and expanding yield gaps between potential yield and actual on-farm yield are measured and analyzed. Producers’ variety adoption decisions explain a relatively small portion of this gap, and producers have become more effective at identifying and adopting yield-enhancing varieties over time. The largest portion of these gaps was explained by on-farm production decisions.
    Keywords: O33 - Technological Change: Choices and Consequences ; Diffusion Processes, Q16 - R&D ; Agricultural Technology ; Agricultural Extension Services
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 16
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    Producer heterogeneity and voting power in mandatory US agricultural marketing organisations (2015)
    Oxford University Press
    Details
    Publication Date: 2015-10-31
    Description: We consider how cost heterogeneity and market power affect voting power in producer referenda for mandatory agricultural marketing organisations with generic promotion programmes in the United States. We measure voting power using the Banzhaf Power Index and propose a new version of this index based on the profit-maximising theory of the firm that provides an improved estimate of voting power. Examining several types of demand shifts and voting rules, we find that both Banzhaf Power and our new measure vary considerably depending on the market structure and level of cost heterogeneity.
    Keywords: D71 - Social Choice ; Clubs ; Committees ; Associations, D72 - Models of Political Processes: Rent-Seeking, Elections, Legislatures, and Voting Behavior, Q13 - Agricultural Markets and Marketing ; Cooperatives ; Agribusiness, Q18 - Agricultural Policy ; Food Policy
    Print ISSN: 0165-1587
    Electronic ISSN: 1464-3618
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 17
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    Neural Activations Associated with Decision-time and Choice in a Milk Labeling Experiment (2015)
    Oxford University Press
    Details
    Publication Date: 2015-12-13
    Description: The authors incorporate brain activation data in an analysis of decision time and choices for milk labeled as produced with growth hormone or cloning technologies, or labeled as conventional milk. Non-hypothetical choices and decision time are correlated with blood oxygenation level-dependent extractions in brain regions previously found to be involved in valuation. The significance of the activations related to price and production technology differs in models of decision time and choice. More areas influence the time it takes to make a decision. The final decision appears to be most correlated with localized areas in the medial prefrontal cortex, with a higher correlation when the choice is about growth hormones than cloning technology.
    Keywords: D87 - Neuroeconomics, Q16 - R&D ; Agricultural Technology ; Agricultural Extension Services
    Print ISSN: 0002-9092
    Electronic ISSN: 1467-8276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 18
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    Study into solar-still performance under sealed and unsealed conditions (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-07
    Description: Safe water is fundamental to life and sustainable development. Despite modern civilization pacing into the 21st century, global access to safe water is disparate and inadequate particularly in south Asia and Africa. The need of the hour is to promote appropriate technologies, such as desalination, which are economically viable and environmentally conducive. With increasing stress on renewable energy use, technologies based on effectively harnessing solar energy would prove sustainable. Solar-still is a desalination technology that effectively harnesses solar energy. Solar-stills generate safe water from either contaminated and/or brackish water. They are an enabling domestic technology that can suit de-centralized operation and maintenance. Their fundamental dependence on solar energy and relatively low yield has thus far impeded wide-spread adoption. The current article discusses the prospects of solar-stills as a safe-water technology. Subsequently, an innovative low internal-volume stepped solar-still has been commissioned and tested for its productivity under sealed and unsealed conditions. The results of the experimental investigation have been discussed in this article. The salient contribution in this article pertains to the performance of a stepped solar-still under sealed and unsealed conditions. Such an investigation has been found to be crucial, but hitherto unattended to.
    Keywords: Solar energy technologies
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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