Results 81 to 90 of about 1,179,700 (185)
Gaoya dianqi, 2009 内部均压是高压硅堆研制的关键技术,而硅堆电压分布不均的现象在端部最为突出。以硅堆分布参数等效电路为基础,先采用解析方法分析硅堆内部电压分布规律和影响因素,针对硅堆端部电压分布尤其不均匀的特点,建立EMTP仿真模型,分析端部强制均压元件参数对硅堆电压分布不均匀系数的影响。提出采用非等值均压参数配置方法改善端部电压分布,并通过实验验证了这种非等值均压参数配置方法对改善高压硅堆电压分布不均匀度的效果。研究表明,这种端部均压方法能有效降低硅堆端部的分压,从而提高硅堆整体的反向耐压。
张磊 +4 more
doaj
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Electrocatalytic C–N coupling technology provides a new approach for green acetamide synthesis, which is achieved via direct reduction of carbon monoxide (CO) and ammonia (NH3). However, efficient, stable catalysts urgently need to be developed, and their reaction mechanisms elucidated.
Haonan Li +6 more
wiley +1 more source
Dianci bileiqi, 2016 雷电的统计分布特性是雷电科学研究的重要基础。利用香港2005年至2014年雷电闪监测资料,进行了雷电的时域分布和雷电流的统计分布特性分析。研究表明:十年雷电总数的逾半数集中分布于极少数日子,深入挖掘相关数据可以为电力系统防雷提供新的可能。香港地闪雷电流幅值频率分布特征随闪电极性有显著差异,负闪雷电流幅值及出现频次均高于正闪。利用IEEE雷电流幅值概率分布公式计算了雷电流幅值的概率密度分布曲线方程,能较准确地反映香港雷电活动规律。
黄礼忠 +4 more
doaj
Grain Boundary Density Governs the Discharge Behavior of Mg Anodes in Biodegradable Batteries
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Biodegradable magnesium (Mg) alloys have entered clinical use, yet their development as self‐powered absorbable batteries is hindered by poor anode performance, including high self‐corrosion, passivation, and nonuniform dissolution. The role of grain boundary density in governing discharge behavior remains unclear.
Xiaohui Shao +3 more
wiley +1 more source
四川大学学报. 自然科学版, 1995 对白蜡虫危害极严重的寄生蜂——白蜡虫花翅跳小蜂幼虫的空间分布型及种群动态进行了研究，认为其分布为聚集分布，可以用负二项分布、Ｎｅｙｍａｎ分布和Ｐｏｉｓｓｏｎ－二项式分布来拟合，用Ｉｗａｏ的平均拥挤度（ｍ）与平均密度（Ｘ）的直线回归法做了拟合，得出ｍ＝０．２７＋１．２１Ｘ，改进的Ｉｗａｏ模型为ｍ＝０．１５＋０．１６Ｘ＋１．５７Ｘ￣２，同时给出其属于负二项分布的理论抽样数及序贯抽样公式。用模糊聚类法将其动态分为４个状态集（亚系统）．并以平均密度为指标给出其种群在寄生于雌蜡虫体内的增长曲线．
朱玮, 吴次彬
doaj
Overdischarge Induced Porous Graphite for Upcycling of Spent Lithium‐Ion Batteries
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT The upcycling of spent lithium‐ion batteries (LIBs) into high‐performance materials offers both economic and environmental benefits. In this study, the principle of battery discharge‐induced copper dissolution and deposition is applied to fabricate a graphite/nanocopper composite anode.
Yadong Wang +13 more
wiley +1 more source
, 1992 裸藻门植物在江汉平原分布的特点是:分布广泛,出现机率高,达96.4％;用方差分析法,检测各采集点浮游生物标本中裸藻门植物种类丰度在平原各地随机分布的差异程度,其结果是无显著的区域性差异;水体中裸藻门植物种类丰度的频数分布近似于一正态曲线,这反映了大多数水体中裸藻类的种类丰度较大;相同频数的种类数与其出现频数的相关性呈明显的幂函数关系 ...
施之新
core
, 2000 利用激光多普勒分相测量技术，考察了液固两相自下而上通过竖置矩形管时，固、液两相的时均速度、流向及横向有脉动强度和颗粒相的相对浓度分布，证实了颗粒浓度的横向分布主要取决于颗粒的横向脉动强度分布（即n_p↑—v'_p~2=常数 ...
刘大有, 路展民
core +2 more sources
中国历史上的虎(Panthera tigris)亚种名称及分布地
野生动物学报, 2016 根据对中国200万年以来虎的分布变迁系统研究,表明中国历史上分布的虎在生态环境变迁过程中曾产生9个亚种,它们的出现与部分灭绝的亚种并不在同一时间。文中不仅对新增虎亚种进行考证,而且对大部分虎亚种的形态、栖息地、分布地区进行梳理,明确它们的古今分布状况及分布界线,还提出规范各虎亚种名称的具体建议。
文榕生 张明海
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