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中国、美国、欧盟计算机能效标准差异解析
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作者 蒋春花 《信息技术与标准化》 2015年第8期42-46,共5页
在全球推行高能效电子产品的形势下,出于节约能源、环境保护的需要,各国对计算机及所使用的外部电源的能效要求不断提高,针对中国、美国、欧盟对计算机产品的能耗要求,进行差异分析方法,选用便携式计算机、一体机、台式微型计算机三种... 在全球推行高能效电子产品的形势下,出于节约能源、环境保护的需要,各国对计算机及所使用的外部电源的能效要求不断提高,针对中国、美国、欧盟对计算机产品的能耗要求,进行差异分析方法,选用便携式计算机、一体机、台式微型计算机三种产品的典型能耗进行测试,通过测试数据分析,作为自愿性认证的能源之星,对计算机产品的能耗要求相对严酷。 展开更多
关键词 计算机能效 GB 28380-2012 能源之星 ErP指令(EU)No617/2013
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Energy efficiency enhancement of two-way amplifier forward relaying with channel estimation error 被引量:1
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作者 师晓晔 葛建华 +1 位作者 李靖 张沉思 《Journal of Central South University》 SCIE EI CAS 2014年第3期987-992,共6页
In order to save energy consumption of two-way amplifier forward(AF) relaying with channel estimation error, an energy efficiency enhancement scheme is proposed in this work. Firstly, through the analysis of two-way A... In order to save energy consumption of two-way amplifier forward(AF) relaying with channel estimation error, an energy efficiency enhancement scheme is proposed in this work. Firstly, through the analysis of two-way AF relaying mode with channel estimation error, the resultant instantaneous SNRs at end nodes is obtained. Then, by using a high SNR approximation, outage possibility is acquired and its simple closed-form expression is represented. Specially, for using the energy resource more efficiently, a low-complexity power allocation and transmission mode selection policy is proposed to enhance the energy efficiency of two-way AF relay system. Finally, relay priority region is identified in which cooperative diversity energy gain can be achieved. The computer simulations are presented to verify our analytical results, indicating that the proposed policy outperforms direct transmission by an energy gain of 3 dB at the relative channel estimation error less than 0.001. The results also show that the two-way AF relaying transmission loses the two-way AF relaying transmission loses its superiority to direct transmission in terms of energy efficiency when channel estimation error reaches 0.03. 展开更多
关键词 AMPLIFY-AND-FORWARD channel estimation error cooperative energy gain energy efficiency outage probability two-way relay
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Guidelines for Low-Cost, Energy-Efficient House in Iraq
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作者 Udo Dietrich SaifRashid Wolfgang Willkomm 《Journal of Civil Engineering and Architecture》 2014年第12期1473-1481,共9页
The goal of this study is to determine specific guidelines for Iraqi architects to contribute to the design and composition of energy-efficient housing units within the limits of a normal budget, locally available mat... The goal of this study is to determine specific guidelines for Iraqi architects to contribute to the design and composition of energy-efficient housing units within the limits of a normal budget, locally available materials and technologies. These units can provide comfort despite the current energy situation in Iraq. The study is based on a computer simulation for a reference building in Baghdad, which has been selected according to the urban conditions, building legislations, housing market and statistics. The final results displayed the main recommendations and the possibility to achieve up to 50% energy reduction with a pay-back period not exceeding two years in some cases. There are some measures that have big energy saving potential. Yet, some of the measures may require big investment or have some bad environmental impacts. Some other good measures are already being implemented. 展开更多
关键词 Iraq HOUSING ENERGY-EFFICIENCY cost simulation optimization material heating and cooling.
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