Results 31 to 40 of about 17,333 (123)
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, 2017 针对真空断路器投切电容器组时发生的重击穿与NSDD所产生的过电压问题,通过对投切电容器组发生重击穿与NSDD典型波形分析,同时5年来真空断路器在投切电容器组的型式试验和老炼试验中发生的重击穿与NSDD次数统计,在中性点不接地系统中,NSDD发生次数远大于重击穿次数,发生重击穿与NSDD在电容器极间与真空断路器断口所产生的过电压基本是没有差异的。因此对NSDD的所产生对电容器的危害是不能忽略的。
李电 +7 more
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Dianci bileiqi, 2021 110 kV并联电容器装置具有单组容量大、电压等级高的特点,而其结构形式和运行工况又与传统并联电容器装置有所区别,因此研究其避雷器参数合理选取原则对于提高其经济性和安全可靠性具有重要意义。以特高压工程110 kV/240 MVA并联电容器装置为研究对象,对其正常分闸重击穿以及单相接地故障情况下单相重击穿时出现的过电压水平进行了理论分析,并在此基础上建立了避雷器吸收能量仿真模型,仿真分析了各种重击穿情况下避雷器的吸收能量以及运行工况对避雷系吸收能量的影响规律,最终提出了最严重工况下避雷器吸收能量的选取建议:
何慧雯, 尹婷, 马跃, 王子建
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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
Shuitu Baochi Xuebao, 2020 对我国农耕区土壤有机质区域变化及其与酸碱度和容重关系进行系统分析，为耕地地力提升和改善土壤结构提供支撑。基于国家级耕地长期定位监测点913个，统计分析全国及7大区域（东北NE、华北NC、西北NW、长江中游MYR、长三角YRD、华南SC、西南SW）耕层土壤有机质含量、酸碱度及容重变化特征。结果表明，全国农耕区耕层土壤有机质含量平均值为22.4~24.8 g/kg。其中有机质含量中等偏低的监测点位占比达72.5%。不同区域耕层土壤有机质含量差异显著 ...
李冬初 +9 more
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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
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT The deformation behavior of NiTiNb shape memory alloys is governed by microstructural heterogeneity, specifically the interconnected topology of the β‐Nb phase. The regulatory role of the eutectic structure in load partitioning and the evolution of deformation mechanisms, particularly in high‐Nb systems, has not been clearly understood.
Qingda Zhang +11 more
wiley +1 more source
Shuitu Baochi Xuebao, 2011 为研究翻耕、旋耕、免耕对作物根系生长影响的机理,以耕层棕壤(0-20cm)和犁底层棕壤(20-40cm)为试验材料,采用盆栽的方法模拟了不同耕作模式及容重,并研究了这些条件对土壤过氧化氢酶、多酚氧化酶、脲酶、磷酸酶、转化酶活性的影响。结果表明:中、下层不同土样及不同容重对土壤酶活性均有显著影响 ...
郑存德 +5 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Aqueous Zn‐ion batteries (AZIBs) are expected to become one of the most promising candidates for large‐scale energy storage, but are impeded by uncontrollable dendrite growth and parasitic reactions. In this study, we propose a simple mechanical shot‐peening (SP) approach for restructuring commercial Zn foils into highly exposed (002)‐textured
Xu Ma +7 more
wiley +1 more source
Gaoya dianqi, 2011 并联电容器广泛应用于电网的无功补偿,但由于频繁操作并联电容器导致的操作过电压会损坏绝缘设备,影响电网运行可靠性。并联电容器的操作过电压主要指分闸重燃过电压,合闸时一般不会产生威胁电容器绝缘的过电压。通过分析重燃过电压产生的原因,提出了通过增加一套常闭断路器来模拟开断并联电容器组时重燃过电压的仿真模型。利用所提出的仿真模型计算重燃过电压,并使用氧化锌避雷器限制并联电容器组分闸重燃过电压,仿真结果表明,所提出的模型是正确的。
张森峰, 商立群
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