Results 71 to 80 of about 622,498 (214)
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT Prevailing levels of hunger, malnutrition, and food insecurity—driven by conflict, global economic crises, and ecological destruction—are threatening fulfillment of the right to adequate food. The integration of human rights in food systems policies can address these challenges; however, progress in the adoption of human rights–based ...
Ellen Johnson +4 more
wiley +1 more source
Gaoya dianqi, 2010 断路器在随机关合空载变压器时会产生幅值、频率很高的励磁涌流,这种操作暂态可能导致微机继保装置误动作,降低用户电能质量和系统可靠性。根据空载变压器涌流产生的机理,采用选相关合技术消除变压器励磁涌流,研究了铁心剩磁和最佳关合相位关系;分析了断路器截流和暂态恢复电压对铁心剩磁影响,并给出了剩磁测量方法。在空载变压器选相关合原理基础上,采用ATP-EMTP软件建立空载变压器关合模型,对暂态过程进行了仿真。仿真结果表明,选相关合技术能有效消除空载变压器合闸时产生的励磁涌流,为空载变压器选相关合提供了理论基础。
李伟 +4 more
doaj
World Water Policy, Volume 12, Issue 4, November 2026.ABSTRACT This paper describes and analyzes recharge practices in Bács‐Kiskun County, Hungary, within what can be categorized as the farmer domain. Such locally embedded aquifer recharge practices remain underexplored in Hungary. Current research and funding largely focus on large‐scale Managed Aquifer Recharge (MAR) interventions emphasizing intended ...
Helen Sundberg, Michael Gilek
wiley +1 more source
World Water Policy, Volume 12, Issue 4, November 2026.ABSTRACT This article examines how renewable‐energy expansion is changing water–energy bargaining among Iran, Iraq, and Türkiye in the Tigris–Euphrates basin. Much of the existing literature on transboundary water politics focuses on territorial control, upstream–downstream power asymmetries, legal rules, and hydro‐hegemony but gives less attention to ...
Umud Shokri
wiley +1 more source
四川大学学报. 自然科学版, 2011 本文主要是研究金属铁经历冲击—卸载到熔化压力区,其内部发生熔化相变时,铁/蓝宝石界面的辐亮度和温度随时间演化特性,发现辐亮度随时间持续增强而界面却经历了一个慢降温过程,该特征与无相变或瞬时相变的热传导模型结论不一致,即无熔化相变或瞬时相变时,界面温度是一个稳定值.本文结合熔化相变动力学模型与热传导方程对实验现象给出一种理论解释.模型计算所给出的温度历史与观测结果一致,由此可以校对其它测量或者计算熔化温度的方法和模型计算的结果,并能够初步限定出该压力下铁的熔化成核速率和径向长大速率.
张世来 +5 more
doaj
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT The intersection of immigration and welfare has taken a central stage in the politics of social policy and garnered increasing scholarly attention in welfare politics research. While prior research has examined how immigration affects welfare support and welfare generosity in the US, less is known about the determinants of immigrant‐related ...
Ping Xu, Ling Zhu, Sebastian Ege
wiley +1 more source
Template self-assembly of thin films on the structures of diblock copolymers(二嵌段共聚物薄膜模板化自组装)
Zhejiang Daxue xuebao. Lixue ban, 2012 用实空间自洽场理论研究了二嵌段共聚物薄膜受限于平行板中的模板化自组装情况.通过改变平行板表面场修饰的情况，给出了粗略微观结构，观察了体系微相结构的变化过程，并对所观察到的变化规律作了讨论.另一方面，固定平行板的厚度、相分离强度等参数，改变吸附表面场的大小，观察并讨论了体系微相结构的变化及其规律.结果表明，二嵌段共聚物体系的微相结构是由受限条件和表面场修饰共同所决定的，因而控制表面场修饰情况的相关参数可以得到所期望的特定高分子体系结构.
ZHOUJun-bao(周军宝) +1 more
doaj +1 more source
, 2010 铝镍钴磁体自十九世纪三十年代问世以来便在二战中应用于电子设备，而今稀土永磁材料因其优异的剩磁和磁能积等性能在许多应用领域都取代了铝镍钴材料。然而，铝镍钴合金由于其极低的温度系数（0.02%/℃）和极高的工作温度等优点，仍被应用于精密仪器和传感器等产品。 本文系统研究了Alnico8合金的显微结构及相变温度，并测试了不同处理状态的合金的磁性能。利用金相观测法测定了柱状晶的尺寸；运用差热分析仪（DSC）测定了铁磁相变温度点的区间；利用透射电子显微镜（TEM）研究了不同条件下合金的微观组织；采用小角X射线散射（
孙可卿
core
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT To improve the strength–toughness balance of IN718, and alleviate the brittleness commonly associated with refractory high‐entropy alloys, this study proposes a novel strategy to fabricate defect‐free IN718/WMoTaNb heterogeneous multiprincipal element alloy coatings via laser‐directed energy deposition.
Zhao Wang +7 more
wiley +1 more source
一种平面相变存储器的制备方法，包括：在衬底上依次生长一层电热绝缘材料层，相变材料层和基底材料层；去除基底材料层的四边，形成基底；在相变材料层的上面和基底材料层的表面及侧面淀积侧墙材料层；去除基底材料层上表面的和相变材料层表面的侧墙材料层，在基底材料层的侧面将形成高和宽均为纳米尺寸的侧墙；去除基底材料层，只保留纳米尺寸的侧墙；去掉除了侧墙底部以外的所有相变材料，从而形成由侧墙和相变材料层构成的叠层侧墙；在该侧墙的一条边上搭上一条制作电极的金属层；去除侧墙以及侧墙表面上的金属层 ...
马慧莉 +5 more
core +1 more source