Latin American and the Caribbean countries have one of the world＇s largest sources of renewable energy. Nonetheless, it estimated that nearly three-quarters of their energy consumption relies on the use of fossil fue...Latin American and the Caribbean countries have one of the world＇s largest sources of renewable energy. Nonetheless, it estimated that nearly three-quarters of their energy consumption relies on the use of fossil fuels, with most of the countries being net importers, ultimately imposing a marked economic and political dependence on those energy commodities. Therefore, the opportunity lies in a higher utilization of various renewable energy resources, which contribute to the country＇s energy security while promoting significant environmental benefits. This manuscript aimed to provide a comparative analysis of current energy scenarios of six Latin American countries （Mexico, Honduras, Nicaragua, Brazil, Chile and Ecuador） to evaluate their policies, programs and strategies implemented in the search for greater participation of renewable energy, with a special attention to biogas. Given the importance of the water-energy-food nexus that could foment the use of renewable energies under conditions of water scarcity, a qualitative data comparison was accomplished, considering biogas production potential, biogas projects and CO2 emissions.展开更多
The article studies China＇s development assistance policy during the last decades. It shows the evolution of Chinese approach to providing foreign aid. The analysis is based on White Papers on China＇s Foreign Aid fr...The article studies China＇s development assistance policy during the last decades. It shows the evolution of Chinese approach to providing foreign aid. The analysis is based on White Papers on China＇s Foreign Aid from 2011 and 2014, theoretical studies, and reports on China＇s foreign aid. From the beginning of the 21st century, China has become one of the most important emerging donors. Chinese aid is primarily provided to Africa, Latin America, Asia, and the Pacific. Depending on the region, the assistance is directed to large-scale infrastructure projects, energy facilities, or natural resource development activities. The aid is combined with investments and trade arrangements. Generally, China＇s aid programme is driven by economic, diplomatic, and strategic objectives. The rules according to which Chinese assistance is provided to developing countries differ significantly from the rules established by Development Assistance Committee （DAC） members. Aid-receiving countries do not have to fulfil strict development assistance regimes and adopt specific economic policies and targets.展开更多
The design and construction of an experimental solar hybrid vehicle based on the combination of photovoltaic solar energy as the main source of electricity and electric power supplied by a generator activated by the d...The design and construction of an experimental solar hybrid vehicle based on the combination of photovoltaic solar energy as the main source of electricity and electric power supplied by a generator activated by the driver＇s pedaling is introduced. The vehicle has a battery to store the energy provided by both systems. The development was motivated by a Latin American solar car race through the Atacama Desert in Chile and the initiative to promote the use of clean energy for transport. A general description of the vehicle, its energetic aspects and experimental results are presented.展开更多
Adaptation and mitigation measures and changes in production and consumption patterns are necessary to face the risks of the impacts of global warming. They imply large investments the costs of which companies and gov...Adaptation and mitigation measures and changes in production and consumption patterns are necessary to face the risks of the impacts of global warming. They imply large investments the costs of which companies and governments, in charge of elites are not always willing to endure. Changes in elites have a direct impact on public policy and environmental governance of societies. Are the new elites willing to change traditional patterns of energy consumption if the change could threaten investment and economic growth3 Based on empirical research this paper analyzes the role of elites in a developing Latin American country （the Chilean case） in decisions adopted about the explanations of climate change and specially on the set of measures for adaptation and/or mitigation, focusing on the energy sector of the economy, one of the key sectors directly implied with the possibilities of reducing greenhouse gases emissions.展开更多
Determining the position of an emitter on Earth by using a satellite cluster has many important applications, such as in navigation, surveillance, and remote sensing. However, in realistic situations, a number of fact...Determining the position of an emitter on Earth by using a satellite cluster has many important applications, such as in navigation, surveillance, and remote sensing. However, in realistic situations, a number of factors, such as errors in the measurement of signal parameters, uncertainties regarding the position of satellites, and errors in the location of calibration sources, are known to degrade the accuracy of target localization in satellite geolocation systems. We systematically analyze the performance of multi-satellite joint geolocation based on time difference of arrival （TDOA） measurements. The theoretical analysis starts with Cramer Rao bound （CRB） derivations for four localization scenarios under an altitude constraint and Gaussian noise assumption. In scenario 1, only the TDOA measurement errors of the emitting source are considered and the satellite positions are assumed to be perfectly estimated. In scenario 2, both the TDOA measurement errors and satellite position uncertainties are taken into account. Scenario 3 assumes that some calibration sources with accurate position information are used to mitigate the influence of satellite position perturbations. In scenario 4, several calibration sources at inaccurate locations are used to alleviate satellite position errors in target localization. Through comparing the CRBs of the four localization scenarios, some valuable＇s insights are gained into the effects of various error sources on the estimation performance. Two kinds of location mean-square errors （MSE） expressions under the altitude constraint are derived through first-order perturbation analysis and the Lagrange method. The first location MSE provides the theoretical prediction when an estimator assumes that the satellite locations are accurate but in fact have errors. The second location MSE provides the localization accuracy if an estimator assumes that the known calibration source locations are precise while in fact erroneous. Simulation results are included to verify the theoretical analysis.展开更多
文摘Latin American and the Caribbean countries have one of the world＇s largest sources of renewable energy. Nonetheless, it estimated that nearly three-quarters of their energy consumption relies on the use of fossil fuels, with most of the countries being net importers, ultimately imposing a marked economic and political dependence on those energy commodities. Therefore, the opportunity lies in a higher utilization of various renewable energy resources, which contribute to the country＇s energy security while promoting significant environmental benefits. This manuscript aimed to provide a comparative analysis of current energy scenarios of six Latin American countries （Mexico, Honduras, Nicaragua, Brazil, Chile and Ecuador） to evaluate their policies, programs and strategies implemented in the search for greater participation of renewable energy, with a special attention to biogas. Given the importance of the water-energy-food nexus that could foment the use of renewable energies under conditions of water scarcity, a qualitative data comparison was accomplished, considering biogas production potential, biogas projects and CO2 emissions.
文摘The article studies China＇s development assistance policy during the last decades. It shows the evolution of Chinese approach to providing foreign aid. The analysis is based on White Papers on China＇s Foreign Aid from 2011 and 2014, theoretical studies, and reports on China＇s foreign aid. From the beginning of the 21st century, China has become one of the most important emerging donors. Chinese aid is primarily provided to Africa, Latin America, Asia, and the Pacific. Depending on the region, the assistance is directed to large-scale infrastructure projects, energy facilities, or natural resource development activities. The aid is combined with investments and trade arrangements. Generally, China＇s aid programme is driven by economic, diplomatic, and strategic objectives. The rules according to which Chinese assistance is provided to developing countries differ significantly from the rules established by Development Assistance Committee （DAC） members. Aid-receiving countries do not have to fulfil strict development assistance regimes and adopt specific economic policies and targets.
文摘The design and construction of an experimental solar hybrid vehicle based on the combination of photovoltaic solar energy as the main source of electricity and electric power supplied by a generator activated by the driver＇s pedaling is introduced. The vehicle has a battery to store the energy provided by both systems. The development was motivated by a Latin American solar car race through the Atacama Desert in Chile and the initiative to promote the use of clean energy for transport. A general description of the vehicle, its energetic aspects and experimental results are presented.
文摘Adaptation and mitigation measures and changes in production and consumption patterns are necessary to face the risks of the impacts of global warming. They imply large investments the costs of which companies and governments, in charge of elites are not always willing to endure. Changes in elites have a direct impact on public policy and environmental governance of societies. Are the new elites willing to change traditional patterns of energy consumption if the change could threaten investment and economic growth3 Based on empirical research this paper analyzes the role of elites in a developing Latin American country （the Chilean case） in decisions adopted about the explanations of climate change and specially on the set of measures for adaptation and/or mitigation, focusing on the energy sector of the economy, one of the key sectors directly implied with the possibilities of reducing greenhouse gases emissions.
基金Project supported by the National Natural Science Foundation of China （No. 61201381）, the Future Development Foundation of Zhengzhou Information Science and Technology Institute （No. YPI2JJ202057）, China Postdoctoral Science Foundation （No. 2016M592989）, and the Outstanding Youth Foundation of Information Engineering University （No. 2016603201）
文摘Determining the position of an emitter on Earth by using a satellite cluster has many important applications, such as in navigation, surveillance, and remote sensing. However, in realistic situations, a number of factors, such as errors in the measurement of signal parameters, uncertainties regarding the position of satellites, and errors in the location of calibration sources, are known to degrade the accuracy of target localization in satellite geolocation systems. We systematically analyze the performance of multi-satellite joint geolocation based on time difference of arrival （TDOA） measurements. The theoretical analysis starts with Cramer Rao bound （CRB） derivations for four localization scenarios under an altitude constraint and Gaussian noise assumption. In scenario 1, only the TDOA measurement errors of the emitting source are considered and the satellite positions are assumed to be perfectly estimated. In scenario 2, both the TDOA measurement errors and satellite position uncertainties are taken into account. Scenario 3 assumes that some calibration sources with accurate position information are used to mitigate the influence of satellite position perturbations. In scenario 4, several calibration sources at inaccurate locations are used to alleviate satellite position errors in target localization. Through comparing the CRBs of the four localization scenarios, some valuable＇s insights are gained into the effects of various error sources on the estimation performance. Two kinds of location mean-square errors （MSE） expressions under the altitude constraint are derived through first-order perturbation analysis and the Lagrange method. The first location MSE provides the theoretical prediction when an estimator assumes that the satellite locations are accurate but in fact have errors. The second location MSE provides the localization accuracy if an estimator assumes that the known calibration source locations are precise while in fact erroneous. Simulation results are included to verify the theoretical analysis.
