Results 1 to 10 of about 25,303 (117)
全球能源互联网, 2021 电力能源系统的绿色发展关系经济活动的可持续发展，因此，电力能源系统的定量可持续性评价是“碳中和”目标下能源结构转型评价的关键工作。为定量统一分析不同发电技术的能量、经济及环境效益，首先采用能值分析理论对光伏、风电、水电、燃气及燃煤5种发电模式的能值可持续指数进行分析，发现现有技术经济水平下风电的能值可持续指数最优。其次，综合考虑能值可持续指数、发电效率、全生命周期成本3个维度指标，基于灰色关联分析法构建了计及能值的中国电力能源系统可持续性综合评价体系，量化分析了2020 ...
王永真 +4 more
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Dizhen xuebao, 2021 对2015年至2019年期间中国大陆西部的磁通门磁力仪秒采样观测资料开展了5—100 s频段的地磁垂直强度极化分析，并运用一些数学方法对分析结果进行了处理。结果显示，极化高值在经向和纬向均无明显的形态和幅值变化，且极化高值与地磁外源场扰动无关。在此基础上筛选出18次极化高值异常事件，利用插值方法得到了极化高值异常的空间分布图，并分析了18次高值异常与中国大陆西部及周边15次强震的时空关系。分析结果表明：地磁场出现多台同步极化高值现象后的半年内，高值区可能发生M6.0以上强震；高值现象出现后 ...
Lili Feng +10 more
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全球能源互联网, 2020 电力零售市场的建设是电力改革的重要内容，也是落实供需结构性改革的重大战略举措。能源互联网发展背景下电力零售市场将出现多元新兴主体，市场环境更加复杂，现行市场机制不明晰且难以有效支撑多元主体接入，将阻碍能源互联网发展和能源革命，因此亟需交融共享的商业模式和灵活自主的交易体系，助力电力零售主体的价值提升和创新发展。首先分析了能源互联网环境下电力市场的转变与电力零售主体类型，随后分析了电力零售主体蕴含的价值，接着从交易和服务两方面设计并构建能源互联网环境下电力零售主体价值实现体系 ...
刘敦楠 +5 more
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Gaoya dianqi, 2020 频率响应分析法是检测电力变压器绕组变形的常用诊断方法之一。近年来,频率响应分析法的检测流程趋向标准化,但寻求合适的算法对频响曲线数据进行量化分析仍需深入研究。文中将频响曲线数据的量化分析看作一个概率分类问题,提出了应用欧氏距离分析诊断变压器绕组变形程度和类型的新方法。研究结果表明,欧氏距离分析能够有效地对变压器绕组变形程度进行诊断,且与先前研究提出的数学指数方法相比,该方法对变形程度的诊断结果具有更高的线性度。同时,在检测频段分段后获取子频段的欧氏距离分布的基础上 ...
张重远 +6 more
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Conservation Biology, EarlyView.Abstract Adaptive management of threatened species relies on having ex ante estimates of species’ responses to different interventions. Structured expert elicitation is often used to generate these estimates, but comparisons of these expert‐predicted outcomes with observed results are rare.
Helen J. Mayfield +18 more
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Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
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Subspecies taxonomy reflects social and geographic patterns of taxonomic effort in tetrapods
Conservation Biology, EarlyView.Abstract Subspecies have been used in conservation biology to account for intraspecific patterns in genetic diversity, which is crucial to long‐term population viability. Although over 3200 subspecies are currently assessed by the International Union for Conservation of Nature Red List, their biological relevance remains controversial.
Jhonny J. M. Guedes +3 more
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Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
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Shuitu Baochi Xuebao, 2004 通过对中国沙棘光合特征及热值的分析发现:在干旱胁迫条件下,中国沙棘的光合作用受到了严重的气孔和非气孔限制;在水分条件好转后,气孔导度不再受干旱的影响,但是光合能力无法恢复。热值分析证明了在水分胁迫后,中国沙棘在生长季结束不能完成能量积累,影响其下一年度生长发育,进而导致死亡。
杨劼 李国强 曹云
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International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines multilingual practices in research interviews, focusing on English lexical insertions in Chinese‐language research interviews with teachers of Chinese in Australian secondary schools, and treating these code‐switches as analytically meaningful rather than incidental.
Chengwen Yuan, Tianwei Zhang, Gary Bonar
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