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description Publicationkeyboard_double_arrow_right Presentation 2012 United StatesAuthors: Barrera, Victor H.;Presentation on applicability of conservation agriculture techniques for mitigation of climate change. LTRA-7 (Pathways to CAPS in the Andes)
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 United StatesPublisher:eScholarship, University of California Authors: Romero Arguello, Juan Manuel;This works presents the design of wireless power transfer systems that can transfer power through materials such as stainless steel, aluminum, carbon fiber, and fiberglass. Wireless power transfer research has been limited to through-air applications, focusing on short distances and high efficiencies. However, complex scenarios require specific design criteria to provide the advantages of wireless power transfer for critical applications. Taking this into consideration, this work presents the extensive research towards enabling wireless power transfer systems for unconventional barriers. In the first chapter a new approach is taken towards the design of compact and embedded wireless power transfer solutions. A miniature coil is designed to transfer power through a 1 mm thick aluminum metal plate. The results are unprecedented, P_rx=100 mW, considering that through metal power transfer had only being demonstrated using large diameter coils. In addition to that, the metal barrier used is aluminum, a high conductivity material. This is important because traditional research focused on less conductive material such as stainless steel or tin. In the next chapter, we demonstrated a wireless power and data transfer system that uses a miniature coil with a size of 15 mm × 13 mm × 6 mm. Our system demonstrated that not only power but data could be transferred through an aluminum barrier using the same coil for power and data transmission. The maximum coil-to-coil power transfer efficiency is 2.4%, and the maximum harvested power is 440 mW operating at 2 kHz. Additionally, our system demonstrated that power can be harvested in variety of materials of different thicknesses. The next chapter presents a breakthrough in the field of wireless power transfer through metal by enabling long distance wireless power transfer. A large portion of the technologies for wireless power transfer are limited to short operation distances, distances around 1-10 millimeters to less than 20 cm. The operation distances are even shorter for the case of through metal wireless power transfer. For through metal wireless power transfer, the high losses from the metal barrier require short operation distances less than 1 mm, in order to transfer some energy through the metal barrier. On the contrary, our system uses a custom designed coil to transfer energy to a receiving coil enclosed in a 1-mm thick aluminum metal box up to a distance of 1m. The maximum AC harvested power was 231 μW when the transmitted power is only 6.16 W. The next chapter presents a long range through metal wireless power transfer and communication system. The system demonstrated that power can be harvested inside a metal box, and that data can be transferred bidirectionally between the nodes. Operating at 103 kHz, a maximum harvested power of 408 μW AC and 96 μW DC is achieved, with bidirectional communication at a rate of 1.2 kbps. The last chapter presents the design of a wireless power transfer systems that can operate through composite materials. The work analyses the effect of different materials and presents a system that can operate wirelessly through carbon fiber and fiberglass. Finally, conclusions present the results of this research and the future perspectives in the field.
eScholarship - Unive... arrow_drop_down eScholarship - University of CaliforniaOther ORP type . 2023Data sources: eScholarship - University of Californiaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert eScholarship - Unive... arrow_drop_down eScholarship - University of CaliforniaOther ORP type . 2023Data sources: eScholarship - University of Californiaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 2007 United StatesPublisher:La Paz, Bolivia: Plural Editores Authors: Valdivia, Corinne; Jiménez, Elizabeth; Romero, A.;handle: 10919/67516
Climate and market shocks impact on the livelihood strategies of families in Altiplano communities. A household survey of 360 families in the Altiplano sheds light how families participate in markets, cope with climate and market shocks, and their feelings of control over these events. Theory proposes that the higher levels of capitals and climate resilient activities will result in a greater sense of control and therefore lower sense of dread. Cluster analysis identified three groups by wealth and life cycle characteristics in each region, as well as clear differences in income, assets, and market production activities between and within regions. Coping strategies in region facing warming and drying trends has focused on loss of assets, such as sales of animals. While in both regions there is diversity of income sources, the major source of diversity in Ancoraimes is crop varieties. While in both regions climatic shocks have had a negative impact on production, this has been experienced in Ancoraimes by 99 to 100 percent of the families, which has implications in terms of coping mechanism that rely on community networks. The other region has also experienced high rates of production shocks, from 71 to 92 percent of household members in each group. Strategies to diversify to climate resilient activities have resulted in increased off farm activities, mostly migration, in the lower income, lower asset region, while the greater assets in livestock, which face a more stable market and ability to withstand climate shocks presents a bifurcated response. Comparison between groups identified in the clusters for each region found no significant differences between groups on climate shock and climate change perceptions, in both regions. The rating on the risk of climate shock hazards at the household level was above 4 in a scale of 1-5 where 4 meant a very high threat and 5 an extreme threat. Umala households ratings were higher for the shocks than for change in climate with an average of 3.79 for the latter, while in Ancoraimes most of the risks were rated from 3.70 to 3.92, with the exception of climate change that was around 4. Overall though, in both regions climate hazard perceptions are high. Market risks are also considered a threat but rated lower than climate. Dread of losing outside networks of support was ranked high by elderly men and women, as well as the change in climate, in Umala, with no differences in Ancoraimes, but higher rates of dread overall do to the significance of this income in their livelihood strategies. Finding to date are consistent with theory, in that the dread, a reflection of the coping or lack of coping mechanisms, is higher in terms of markets for livestock in Umala, and higher in terms of loss of remittances from family members in Ancoraimes. The study finds that coping mechanism are based on individual household strategies, rather than community or institutions. LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Thesis 2008 United StatesPublisher:Bolivar, Ecuador: Universidad Estatal de Bolívar, Facultad de ciencias agropecuarias, recursos naturales y del ambiente. Escuela de ingeniería agroforestal y pecuarias Authors: Rivera, M. M. G.;This thesis analyzes household data and characterizes farm households according to their livelihood strategy. Livelihood classes are then analyzed to examine the environmental and socioeconomic conditions faced by household members. The author suggests that in order to effectively address issues related to water supply, biodiversity conservation, deforestation, public health, and access to markets for families in Ecuador, socioeconomic and environmental aspects need to be considered in the analysis. LTRA-3 (Watershed-based NRM for Small-scale Agriculture)
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2013Publisher:Barcelona Centre for International Affairs (CIDOB) Authors: Paul Isbell;Sweeping changes are beginning to transform energy scenarios around the world. The gas revolution, a renaissance in petroleum technology and exploration, and a chaotic but powerful movement toward the goal of low-carbon economies are three of the principal energy trends currently interacting with structural changes in the geo-economics of the Atlantic world to present new perspectives and opportunitiesfor the diverse actors in the ‘Atlantic Basin’. This article explores how changes in the energy landscape are contributing to a reassessment of the strategic horizon. The potential impacts of the shale revolution, deep-offshore oil, biofuels and other modern renewable energies on the geopolitics of the Atlantic Basin will be assessed, and the hypothesis that an Atlantic Basin energy system is now taking shape will be evaluated, along with an analysis of anticipated impacts.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Presentation 2007 United StatesAuthors: Valdivia, Corinne;Presentation about the lessons from climate-market interactions in the Andes, livelihoods strategies and resiliency. LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Presentation 2007 United StatesAuthors: Turín, Cecilia; Cóndor, Pedro; Flora, Cornelia B.; Flora, Jan L.;Presentation of the case study research that is being conducted in the Community of Santa Maria in Peru within the objectives of SANREM-CRSP LTR-4 project "Adapting to climate and market change in Altiplano communities". LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Presentation 2008 United StatesAuthors: Fernández-Baca, Edith;This brief presentation reports the results of SANREM CRSP LTR-4 project work in communities of Apopata and Santa Maria in Peru to study the presence of climate change and adaptive strategies made by local people. The results are shown in terms of indicators measured, livelihood strategies, and forecast efficiency. LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , Article 2010Publisher:Unknown Authors: Colon Guasp, Wilfredo; Colon Guasp, Wilfredo;The amount of energy and food consumed in Puerto Rico is more indicative of a developed nation than one than is underdeveloped. All the energy consumed in Puerto Rico is from fossil fuels, while the agricultural sector marginally provides the needs of the consumer. In addition, the animal production sectors rely exclusively on imported feedstock for the preparation of feeds. There is a potential to develop an ethanol industry based initially on sugarcane, as the main feedstock and then turn to biomass from energy cane and or organic solid waste in the future. In order to move to the second generation of ethanol production, the cellulosic ethanol industry has to become economically viable. A limiting factor in the use of sugarcane is that only 40,000 ha are currently available to grow this crop. Potentially, Puerto Rico can produce 200 million liters of ethanol on this area which could substitute 5% of the gasoline that was consumed in 2007. On the other hand, biomass could be obtained from bagasse, energy cane, and from 1.3 metric tons of organic solid waste (food and yard waste) produced annually on the island. This strategy can provide a relief to decreasing the amounts of organic solid waste that end up in the landfills.
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description Publicationkeyboard_double_arrow_right Presentation 2012 United StatesAuthors: Barrera, Victor H.;Presentation on applicability of conservation agriculture techniques for mitigation of climate change. LTRA-7 (Pathways to CAPS in the Andes)
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 United StatesPublisher:eScholarship, University of California Authors: Romero Arguello, Juan Manuel;This works presents the design of wireless power transfer systems that can transfer power through materials such as stainless steel, aluminum, carbon fiber, and fiberglass. Wireless power transfer research has been limited to through-air applications, focusing on short distances and high efficiencies. However, complex scenarios require specific design criteria to provide the advantages of wireless power transfer for critical applications. Taking this into consideration, this work presents the extensive research towards enabling wireless power transfer systems for unconventional barriers. In the first chapter a new approach is taken towards the design of compact and embedded wireless power transfer solutions. A miniature coil is designed to transfer power through a 1 mm thick aluminum metal plate. The results are unprecedented, P_rx=100 mW, considering that through metal power transfer had only being demonstrated using large diameter coils. In addition to that, the metal barrier used is aluminum, a high conductivity material. This is important because traditional research focused on less conductive material such as stainless steel or tin. In the next chapter, we demonstrated a wireless power and data transfer system that uses a miniature coil with a size of 15 mm × 13 mm × 6 mm. Our system demonstrated that not only power but data could be transferred through an aluminum barrier using the same coil for power and data transmission. The maximum coil-to-coil power transfer efficiency is 2.4%, and the maximum harvested power is 440 mW operating at 2 kHz. Additionally, our system demonstrated that power can be harvested in variety of materials of different thicknesses. The next chapter presents a breakthrough in the field of wireless power transfer through metal by enabling long distance wireless power transfer. A large portion of the technologies for wireless power transfer are limited to short operation distances, distances around 1-10 millimeters to less than 20 cm. The operation distances are even shorter for the case of through metal wireless power transfer. For through metal wireless power transfer, the high losses from the metal barrier require short operation distances less than 1 mm, in order to transfer some energy through the metal barrier. On the contrary, our system uses a custom designed coil to transfer energy to a receiving coil enclosed in a 1-mm thick aluminum metal box up to a distance of 1m. The maximum AC harvested power was 231 μW when the transmitted power is only 6.16 W. The next chapter presents a long range through metal wireless power transfer and communication system. The system demonstrated that power can be harvested inside a metal box, and that data can be transferred bidirectionally between the nodes. Operating at 103 kHz, a maximum harvested power of 408 μW AC and 96 μW DC is achieved, with bidirectional communication at a rate of 1.2 kbps. The last chapter presents the design of a wireless power transfer systems that can operate through composite materials. The work analyses the effect of different materials and presents a system that can operate wirelessly through carbon fiber and fiberglass. Finally, conclusions present the results of this research and the future perspectives in the field.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 2007 United StatesPublisher:La Paz, Bolivia: Plural Editores Authors: Valdivia, Corinne; Jiménez, Elizabeth; Romero, A.;handle: 10919/67516
Climate and market shocks impact on the livelihood strategies of families in Altiplano communities. A household survey of 360 families in the Altiplano sheds light how families participate in markets, cope with climate and market shocks, and their feelings of control over these events. Theory proposes that the higher levels of capitals and climate resilient activities will result in a greater sense of control and therefore lower sense of dread. Cluster analysis identified three groups by wealth and life cycle characteristics in each region, as well as clear differences in income, assets, and market production activities between and within regions. Coping strategies in region facing warming and drying trends has focused on loss of assets, such as sales of animals. While in both regions there is diversity of income sources, the major source of diversity in Ancoraimes is crop varieties. While in both regions climatic shocks have had a negative impact on production, this has been experienced in Ancoraimes by 99 to 100 percent of the families, which has implications in terms of coping mechanism that rely on community networks. The other region has also experienced high rates of production shocks, from 71 to 92 percent of household members in each group. Strategies to diversify to climate resilient activities have resulted in increased off farm activities, mostly migration, in the lower income, lower asset region, while the greater assets in livestock, which face a more stable market and ability to withstand climate shocks presents a bifurcated response. Comparison between groups identified in the clusters for each region found no significant differences between groups on climate shock and climate change perceptions, in both regions. The rating on the risk of climate shock hazards at the household level was above 4 in a scale of 1-5 where 4 meant a very high threat and 5 an extreme threat. Umala households ratings were higher for the shocks than for change in climate with an average of 3.79 for the latter, while in Ancoraimes most of the risks were rated from 3.70 to 3.92, with the exception of climate change that was around 4. Overall though, in both regions climate hazard perceptions are high. Market risks are also considered a threat but rated lower than climate. Dread of losing outside networks of support was ranked high by elderly men and women, as well as the change in climate, in Umala, with no differences in Ancoraimes, but higher rates of dread overall do to the significance of this income in their livelihood strategies. Finding to date are consistent with theory, in that the dread, a reflection of the coping or lack of coping mechanisms, is higher in terms of markets for livestock in Umala, and higher in terms of loss of remittances from family members in Ancoraimes. The study finds that coping mechanism are based on individual household strategies, rather than community or institutions. LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Thesis 2008 United StatesPublisher:Bolivar, Ecuador: Universidad Estatal de Bolívar, Facultad de ciencias agropecuarias, recursos naturales y del ambiente. Escuela de ingeniería agroforestal y pecuarias Authors: Rivera, M. M. G.;This thesis analyzes household data and characterizes farm households according to their livelihood strategy. Livelihood classes are then analyzed to examine the environmental and socioeconomic conditions faced by household members. The author suggests that in order to effectively address issues related to water supply, biodiversity conservation, deforestation, public health, and access to markets for families in Ecuador, socioeconomic and environmental aspects need to be considered in the analysis. LTRA-3 (Watershed-based NRM for Small-scale Agriculture)
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2013Publisher:Barcelona Centre for International Affairs (CIDOB) Authors: Paul Isbell;Sweeping changes are beginning to transform energy scenarios around the world. The gas revolution, a renaissance in petroleum technology and exploration, and a chaotic but powerful movement toward the goal of low-carbon economies are three of the principal energy trends currently interacting with structural changes in the geo-economics of the Atlantic world to present new perspectives and opportunitiesfor the diverse actors in the ‘Atlantic Basin’. This article explores how changes in the energy landscape are contributing to a reassessment of the strategic horizon. The potential impacts of the shale revolution, deep-offshore oil, biofuels and other modern renewable energies on the geopolitics of the Atlantic Basin will be assessed, and the hypothesis that an Atlantic Basin energy system is now taking shape will be evaluated, along with an analysis of anticipated impacts.
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Presentation 2007 United StatesAuthors: Valdivia, Corinne;Presentation about the lessons from climate-market interactions in the Andes, livelihoods strategies and resiliency. LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______2485::239c3ed9cf658ad2805c027f8dc79b6e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______2485::239c3ed9cf658ad2805c027f8dc79b6e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Presentation 2007 United StatesAuthors: Turín, Cecilia; Cóndor, Pedro; Flora, Cornelia B.; Flora, Jan L.;Presentation of the case study research that is being conducted in the Community of Santa Maria in Peru within the objectives of SANREM-CRSP LTR-4 project "Adapting to climate and market change in Altiplano communities". LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______2485::17906ae7ae0fc355d99f3f6be4e62599&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______2485::17906ae7ae0fc355d99f3f6be4e62599&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Presentation 2008 United StatesAuthors: Fernández-Baca, Edith;This brief presentation reports the results of SANREM CRSP LTR-4 project work in communities of Apopata and Santa Maria in Peru to study the presence of climate change and adaptive strategies made by local people. The results are shown in terms of indicators measured, livelihood strategies, and forecast efficiency. LTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______2485::b99a9269f051f5b5999e0da13cd3bbfe&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , Article 2010Publisher:Unknown Authors: Colon Guasp, Wilfredo; Colon Guasp, Wilfredo;The amount of energy and food consumed in Puerto Rico is more indicative of a developed nation than one than is underdeveloped. All the energy consumed in Puerto Rico is from fossil fuels, while the agricultural sector marginally provides the needs of the consumer. In addition, the animal production sectors rely exclusively on imported feedstock for the preparation of feeds. There is a potential to develop an ethanol industry based initially on sugarcane, as the main feedstock and then turn to biomass from energy cane and or organic solid waste in the future. In order to move to the second generation of ethanol production, the cellulosic ethanol industry has to become economically viable. A limiting factor in the use of sugarcane is that only 40,000 ha are currently available to grow this crop. Potentially, Puerto Rico can produce 200 million liters of ethanol on this area which could substitute 5% of the gasoline that was consumed in 2007. On the other hand, biomass could be obtained from bagasse, energy cane, and from 1.3 metric tons of organic solid waste (food and yard waste) produced annually on the island. This strategy can provide a relief to decreasing the amounts of organic solid waste that end up in the landfills.
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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