Results 41 to 50 of about 25,407 (149)
Policy Studies Journal, EarlyView.ABSTRACT The examination of policy evolution has important practical implications, but current literature often only evaluates changing policy goals and instruments at the macro‐level, overlooking changes that occur at the more granular, micro‐level of policy text.
Graham Ambrose +1 more
wiley +1 more source
野生动物学报, 2010 根据2008～2009年实地考察研究结果,着重就该区2种有蹄类动物的分布、种群数量以及有关问题作概要性探讨。调查研究结果表明:（1）老虎台盘羊分布区盘羊平均密度=8.49/8=1.06只/km2,黑英山盘羊分布区盘羊平均密度=5.34/3=1.78只/km2。整个分布区盘羊种群数量1 488只,其中,老虎台分布区种群数量=480×1.06=509只,黑英山分布区种群数量=550×1.78=979只。（2）老虎台北山羊分布区北山羊平均密度=14.59/5=2.92只/km2 ...
阿布力米提·阿布都卡迪尔 +5 more
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Dianci bileiqi, 2023 大量分布式新能源并网所带来的高随机性和强波动性将引发配电网的暂态过电压行为，是分布式能源发展的痼疾之一。本研究总结了分布式新能源并网接入系统产生的暂态过电压问题，并总结了过电压抑制方法，分析了分布式新能源接入系统中暂态过电压机理，包括功率变化、不对称故障、工作频率和谐振等因素。在此基础上，总结了分布式抑制暂态过电压的方法，包括母线调节和逆变器控制等手段，并指出了抑制方法的优缺点，最后针对分布式新能源高渗透率化和大量负荷随机性接入角度进行了展望。本研究有助于更好地理解分布式新能源接入暂态过电压问题 ...
牛嘉琪
doaj
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT Household food expenditure continues to be a key factor in ensuring the realization of the Human Right to Adequate Food. Particularly in Brazil, access to food can be limited by economic constraints in vulnerable families, especially among farming families, who have been more vulnerable to food insecurity in recent years in the country.
Lucas de Almeida Moura +3 more
wiley +1 more source
Gaoya dianqi, 2009 笔者提出应用ART算法根据测量得到的两个垂直方向上的弧根线性电流分布重建弧根电流密度分布的方法。对Drouet M G实验测量的弧根在2个互相垂直方向的电流分布进行计算,获得了2-D弧根电流密度分布并加以讨论。结果表明,ART重建算法结合分离极板法所测的弧根电流分布是获得其电流密度分布的一个切实可行而有效的途径。
徐铁军, 荣命哲, 吴翊, 马强
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PLANTS, PEOPLE, PLANET, Volume 8, Issue 5, Page 1407-1418, September 2026.The jewel‐like flowers of Thismia are as rare as they are beautiful, often recorded from only a single site per species. Access to 15 populations of T. kobensis has enabled an uncommon, range‐wide assessment of morphology, genetics, and fungal partners. Our analyses showed that T.
Kenji Suetsugu +4 more
wiley +1 more source
Research on Face Load Distribution for Narrow Helioal Gears
Jixie chuandong, 1994 本文用三维边界元程序计算了窄斜齿轮在不同接触线上的载荷分布，分析了齿轮齿面载荷的分布规律。同时还计算出齿轮副的平均刚度ｋｎ１和载荷分布系数Ｋβ计算结果表明荷载分布规律与轴向重合度εβ及传动比有关，载荷分布系数Ｋβ在１．０４至１．２３之间。
王宪法
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Intangible drivers of tolerance shape human–elephant coexistence in Southwest China
People and Nature, Volume 8, Issue 8, Page 2763-2780, August 2026.Abstract Southwest China is home to a small but rapidly expanding population of Asian elephants (Elephas maximus), whose growth has intensified conflicts with people living in shared landscapes. These conflicts result in substantial economic losses and occasional human casualties. This coexistence paradox—where conservation success leads to significant
Xiaoyu Yu +4 more
wiley +1 more source
Dianci bileiqi, 1981 本文研究未上釉棒形抗折瓷件强度的理论分布,其分布遵循维布尔分布。各种不同因素的试验验证了理论分布的正确性。本文还对估计维布尔参数值的方法进行了讨论,且对大容量子样估计了均匀性系数m在一定置信水平下的置信区间。
马功勋, 刘长荣, 陶增炎
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Alloy‐Type Anode Materials for Sodium‐Ion Batteries: From Single Metals to MultiComponent Alloys
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Sodium‐ion batteries (SIBs) are widely regarded as a promising alternative to lithium‐ion batteries due to their abundant sodium resources, broad geographical distribution, and low cost, rendering them particularly attractive for large‐scale energy storage applications.
Zicheng Yin +12 more
wiley +1 more source