Results 131 to 140 of about 43,544 (260)
Dianci bileiqi, 2002 线路避雷器的设计关键是串联间隙距离 ,作者通过分析线路避雷器串联间隙的工作状况 ,提出了间隙距离的设计思想和简化试验方法 ,供设计、检测及标准制订等人员参考。
车文俊
doaj
Rare Metals, EarlyView.ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan +10 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Photocatalytic hydrogen production from water splitting is a promising strategy for sustainable and clean energy generation. However, the design of low‐cost, highly active photocatalysts remains a critical challenge. In this study, covalent organic frameworks (COFs) were loaded onto the surface of Cd0.9Cu0.1S to fabricate COF/Cd0.9Cu0.1S ...
Yue Zhao +3 more
wiley +1 more source
非工作日手术对患者住院期间死亡及重要器官功能衰竭的影响 附视频
Zhongguo shiyan zhenduanxue目的 探究非工作日手术对患者住院期间死亡及术后重要器官功能衰竭的影响。方法 收集2021年华西医院住院时间≥24 h、住院期间接受手术患者病例资料。根据手术结束时间将患者分为两组：工作日组和非工作日组(包括法定节假日)。采取倾向得分匹配法比较两组患者住院期间死亡率、术后重要器官功能衰竭发生率等方面的差异。结果 研究共纳入74 664例病例，其中工作日组64 433例，非工作日组10 201例。匹配前，纳入全部可干预及不可干预因素的二元logistics回归分析显示 ...
doaj +2 more sources
Conservation Funding at the Local Level 地方层面的保护资金
Wildlife Letters, EarlyView.Direct conservation fund transfer to local communities ensures the involvement of these communities in decision‐making and fund utilisation, which will ultimately lead to effective biodiversity conservation. A Cakchiquel family in the hamlet of Patzutzun, Guatemala, 1993. Credits: John Issac. Source: UNEP‐WCMC Internal Resources.
Jithu K Jose
wiley +1 more source
Shuitu Baochi Xuebao目的研究渭北苹果园不同种类绿肥间作及其结合地布覆盖在土壤蓄水保墒、养分供给和果实产量提升方面的效应。方法设置黑麦草（R）、油菜（O）、苜蓿（A）3种绿肥和不覆地布（NG）、覆盖地布（G）2种覆盖方式，以清耕为对照（CK）。不覆地布+绿肥间作为主处理，覆盖地布+绿肥间作为副处理。在主处理和对照各小区分别设置15N田间示踪微区。探究苹果-绿肥间作系统土壤水分、养分及果实产量的响应。结果各处理土壤质量含水率均低于CK处理，GR处理下降幅度最小（1.7%）。主处理土壤水分差异率均为负值，其中NGR处理绝对值最低（
梁青 +5 more
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Dianci bileiqi, 1985 3.3和1.65kV РВКУ型阀式避雷器（统一设计的防护操作过电压用阀式避雷器）新系列是在全部零件统一的基础上研制的。组装避雷器的基本标准元件有火花间隙组和阀片组。间隙组由综合了转弧间隙和拉弧间隙的性能的复合式间隙组成。间隙（装置）的作用原理由全苏列宁电工研究院设计的 ...
В.П.ГИРЗЕ, 罗广能
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Wildlife Letters, EarlyView.In this study we analyze the role of phylogeny, environment, and community structure on sociality. Using structural equation modeling (SEM) we aim to quantify the direct and indirect impacts of variables on behaviors including social grouping, reproduction, and space use among Carnivora species.
Jessica Ward +3 more
wiley +1 more source
Gaoya dianqi, 1997 通过对组合电器中熔断器撞击器在配合特性中的作用分析及动作特性的研究,认为熔断器撞击器动作的快慢也是影响组合电器所需开断的转移电流值的因素之一,撞击器动作时间t0与通过撞击器的电流值有关,其动作特性是一条反时延曲线。对弹簧型撞击器 ...
金立军, 马志瀛, 徐黎明
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玉米花生间作对花生植株生长动态影响的研究 Effect of Maize-Peanut Intercropping on Peanut Growth Dynamics
, 2018 相云秋 +5 more
semanticscholar +1 more source