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全面核禁试条约第三届全球次声监测工作研讨会于1997年8月25至28日在美国新墨西哥州西班牙式的古城圣菲举行.会议云集了中国、美国、法国、俄罗斯、阿根廷、澳大利亚等5大洲12个国家61位活跃在次声学科领域的研究人员、政府官员以及联合国临时技术秘书等要员,围绕着全球次声监测中的7个专题进行报告和讨论,它们依次为:欢声阵的设计和信号处理,次声阵性能和减噪设备;法国欢声监测系统,国际次声监测系统60个站网的能力模型,对流层风对长距离次声传播的影响,高空风对次声同性能的影响,渗透管的特性以及对次声监测的减噪作用,欢声减噪器;爆炸检测,声遥感技术对爆炸源能量的估计,小当量地下,地面和近地面爆炸远距离声传 相似文献
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《电子产品可靠性与环境试验》2011,(5):20-20
美国能源部劳伦斯伯克利国家实验室及加州大学伯克利分校的研究人员揭开了铁电材料在光照条件下产生高压电的秘密。该研究发表在《物理评论快报》上。铁电材料是指具有铁电效应的一类材料,它是热释电材料的一个分支。 相似文献
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Nordic风能公司的双叶片转子脱离了传统的风电设计。
2009年春季,由美国国会批准的经’济刺激资金中的第一笔研发补助金授予了一家可再生能源开发商,这对风力涡轮机的设计产生了重大影响。美国能源部(DOE)为加利福尼亚州伯克利市的Nordic风能公司提供了价值1600万美元的贷款保证,这将加速该公司的由瑞典设计的双叶风力涡轮机的商业化进程,标志着在超过10年的时间内,在主导三叶片设计的该行业产生了第一个公用事业规模的替代方案。 相似文献
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朝阳 《激光与光电子学进展》2006,43(10):7-7
美国能源部的固态照明核心技术计划将资助Kyma公司开发一种新型绿光LED,该计划被Homoepitaxial MOVPE称为“高性能绿光LED”。
开发小组在Ⅲ族氮化物材料基础上,经过改良材料、改善制作绿光LED的工艺,开发绿光LED技术,以填补现代半导体LED技术中的“绿光空白”。关键的材料改良有望在Kyma低缺陷密度的自然镓氮化物基底上实现。这种材料和工艺的改善需要固态照明市场的投资,普遍认为这是氮化物半导体器件的最大潜在市场。 相似文献
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Theoretical study of molecular hydrogen and spiltover hydrogen storage on two-dimensional covalent-organic frameworks 下载免费PDF全文
Molecular hydrogen and spiltover hydrogen storages on five two-dimensional (2D) covalent-organic frameworks (COFs) (PPy-COF, TP-COF, BTP-COF, COF-18 A, and HHTP-DPB COF) are investigated using the grand canonical Monte Carlo (GCMC) simulations and the density functional theory (DFT), respectively. The GCMC simulated results show that HHTP-DPB COF has the best performance for hydrogen storage, followed by BTP-COF, TP-COF, COF-18 A, and PPy-COE However, their adsorption amounts at room temperature are all too low to meet the uptake target set by US Department of Energy (US-DOE) and enable practical applications. The effects of pore size, surface area, and isosteric heat of hydrogen on adsorption amount are considered, which indicate that these three factors are all the important factors for determining the H2 adsorption amount. The chemisorptions of spiltover hydrogen atoms on these five COFs represented by the cluster models are investigated using the DFT method. The saturation cluster models are constructed by considering all possible adsorption sites for these cluster models. The average binding energy of a hydrogen atom and the saturation hydrogen storage density are calculated. The large average binding energy indicates that the spillover process may pro- ceed smoothly and reversibly. The saturation hydrogen storage density is much larger than the physisorption uptake of H2 molecules at 298 K and 100 bar (1 bar = 105 Pa), and is close to or exceeds the 2010 US-DOE target of 6 wt% for hydrogen storage. This suggests that the hydrogen storage capacities of these COFs by spillover may be significantly enhanced. Thus 2D COFs studied in this paper are suitable hydrogen storage media by spillover. 相似文献
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美国能源部(DOE)近日发布了其继续测试的飞利浦照明相赢得LPrize奖项当于60WLED改装灯的报告,结果显示灯泡完成了超过20000小时以上的无故障运行。该机构认为此测试相当于家庭正常使用18年无故障(基于典型的家用灯泡使用时间平均3小时)。 相似文献
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Design optimization of highly efficient spectrum-splitting and beam-concentrating diffractive optical element for lateral multijunction solar cells 下载免费PDF全文
Two improved algorithms are proposed to extend a diffractive optical element (DOE) to work under the broad spec- trum of sunlight. An optimum design has been found for the DOE, with a weighted average optical efficiency of about 6.8% better than that of the previous design. The optimization of designing high optical efficiency DOEs will pave the way for future designs of high-efficiency, low-cost lateral multijunction solar cells based on such a DOE. 相似文献