Results 81 to 90 of about 20,406 (216)
长三角地区工业细分行业碳效率评价及其影响因素分析 [PDF]
全球能源互联网由浙江、江苏、安徽和上海组成的长三角地区是国内经济发展高地，同时也是高碳排放区域。研究长三角地区细分行业碳效率特征及其影响因素，不仅对这一地区实现低碳发展目标具有重要意义，也对全国其他地区未来低碳发展具有较为重要的指导意义。利用固定效应随机前沿模型对2014至2019年三省一市37个行业进行了碳效率测算，并对各地区工业碳效率动态变化进行了分析；然后，基于随机前沿模型方法对碳效率影响因素进行了探究；最后，应用不同生产函数形式和去极端值的方式验证了本模型的稳健性。研究结果表明 ...
卢峰 +4 more
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Optimal Design of Heat Pipe Based on the Multi-object Genetic Algorithm [PDF]
, 2011 Heat pipes have been used widely in many engineering fields due to their higher rate of heat transfer.However,the design of heat pipes often involves selection of multiple parameters and the conventional design algorithms are not efficient in optimizing ...
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Effects of political identity activation and inaccurate metaperceptions on attitudes toward wolves
Conservation Biology, EarlyView.Abstract Polarization between groups can undermine durable conservation outcomes. Activating group identities (i.e., an individual's sense of self derived from membership in a group) can exacerbate differences, especially when people hold inaccurate perceptions of their peers and rivals.
Alexander L. Metcalf, Justin W. Angle
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Dianci bileiqi, 2010 介绍了长棒形悬式瓷绝缘子主要机电性能、技术参数和结构造型等方面的特点,对国内外产品技术标准、结构造型发展变化和使用情况进行了分析。结合我国近年来该产品推广使用情况,分析了今后长棒形悬式瓷绝缘子的发展趋势,指出随着我国超高压输电线路可靠性指标对绝缘子提出更高的技术要求。建议:采用氧化铝配方,进一步增强瓷质机械强度和增加设计裕度;采用半导体釉技术是长棒形瓷绝缘子提高耐污性能、防电晕性能有效的措施;长棒形瓷绝缘子使用均压环和招弧角,有效放电间隙变小,可考虑增加200～400 mm有效的绝缘体长度 ...
王镔
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Gaoya dianqi, 2020 为了研究谐波对变压器铁心等效磁路长度与接缝区域损耗的影响,文中基于完全按照电力变压器的标准设计和制作的叠片铁心模型,在不同谐波激励条件下,对铁心模型的等效磁路长度与接缝区域的损耗特性进行试验研究。研究表明:谐波阶次与谐波相位对铁心的磁路长度影响不是很大,在谐波条件下分析计算铁心的磁滞回环或磁化曲线时,可近似选择铁心的几何平均长度作为有效的磁路长度;不同谐波阶次与不同谐波相位激励下,铁心接缝区域比总损耗特性的变化规律大致相同:当磁通密度小于0.5 T时,接缝区的损耗近似为零;当磁通密度高于1 T时 ...
赵志刚 +4 more
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Tunable narrow linewidth fiber laser with two FBG-FPs [PDF]
, 2013 基于游标原理,利用一对自由谱宽(fSr)略有不同的光纤布喇格光栅法布里-珀罗腔(fbg-fP)作为模式选择器件,设计了一种新颖的环形腔光纤激光器。从理论和实验上研究了该激光器的特性。通过对可调谐fbg-fP应力调谐,在1552.240~1552.912 nM范围内,以96 PM为平均间距,获得了8个由固定fbg-fP的透射谱所确定的窄线宽稳定激光输出。8个输出波长的平均功率为-17.66 dbM,波动在0.7 db范围内。当泵浦光的功率为95 MW的时候,输出信号的信噪比均大于50 db。实验上每隔1 ...
周金龙, 杜勇, 董小鹏, 陈敏秀
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International Journal of Applied Linguistics, EarlyView.ABSTRACT This study investigates how the learner‐related factors of language dominance, encompassing language history, proficiency, use, and attitude, modulate congruency effects in multi‐word unit (MWU) processing among early bilinguals. Seventy Cantonese–Putonghua bilinguals completed lexical decision tasks measuring reaction time and accuracy for ...
Mingjia Cai, Yuan Liang
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, 2018 为了研究襟翼小涡与主翼尖涡相交不稳定性触发条件,采用矩形机翼模型产生一对翼尖涡,同时在机翼上安装不同宽度及攻角的襟翼,对35个翼展下诱发R-L(Rayleigh-Ludwig)不稳定性的最佳涡系参数组合进行了研究。结果表明:通过水槽流动显示实验发现,单主翼尾涡在第35个翼展处未发生明显变化,能量衰减缓慢;加装襟翼后尾流不稳定性被触发,衰减效果明显,在一定范围内尾涡能量衰减值随着襟翼攻角的增大而增大;环量统计半径Rd=50mm时,对主翼尖涡环量进行PIV(Particle Image ...
傅向向 +6 more
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Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, EarlyView.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
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Guangtongxin yanjiu, 1999 本文主要用实验数据简要叙述了光纤光栅中Ｂｒａｇｇ波长随温度和应力的变化呈良好的线性关系，并介绍了一种温度补偿仪，它能有效地抑制光纤光栅的Ｂｒａｇｇ波长随温度的漂移。
蒋英, 庞翠珠, 陈根祥, 简水生
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