Results 11 to 20 of about 645 (77)
Research on internal temperature temporal and spatial distribution of citrus peel in heat treatment process [PDF]
Objective: This study aimed to obtain the temperature distribution law of different points in citrus fruit over time during heat treatment. Methods: The temperature change of citrus peel during heat treatment was studied from the perspective of heat ...
CAI Xiangyu +4 more
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Social protection and resilience in protracted crises
International Social Security Review, Volume 78, Issue 2-3, Page 173-190, April-September 2025.Abstract This article critically examines perspectives on social protection’s role in strengthening resilience capacities in protracted crises – contexts where conflict and displacement persist for five years or longer. These crises shape how stakeholders navigate their mandates to provide support, while influencing how affected communities seek to ...
Carolina Holland‐Szyp, Jeremy Lind
wiley +1 more source
Gaoya dianqi, 2023 鸟啄复合绝缘子为输电线路的安全运行带来了严重的隐患。为进一步理解材料特性与鸟啄损伤程度之间的关系，文中基于冲击动力学理论，对复合绝缘子的伞裙护套材料的耐冲击力学特性进行了研究。建立了包含材料弹性模量、密度、泊松比、鸟嘴形状系数等相关参数的复合绝缘子鸟啄冲击模型。模型根据鸟啄速度分为弹性变形、塑性变形与流体变形3个阶段，描述了复合绝缘子伞套材料的鸟啄深度与鸟啄速度之间的关系。设计了模拟鸟啄的人工冲击试验，以硅橡胶与脂环族环氧树脂两种伞套材料为例，对比了两种材料的耐冲击特性。结果发现 ...
尹立 +4 more
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Design of silicon micro machined wave guide pressure sensor [PDF]
, 2002 随着波导材料的研究和进展 ,采用新的波导材料设计出了一种波导式压力传感器 ,就光波导压力传感器的原理和特性作了一个简要阐述 ,对它的工艺流程作了详细的描述With the development and research of wave guide material,the new wave guide materials were adopted to design a new optical wave guide pressure sensor.The structure,character and
胡国清, 许高攀
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Complicated grief and posttraumatic stress after loss and separation under terror conditions
Journal of Traumatic Stress, Volume 37, Issue 1, Page 154-165, February 2024.Abstract The lives of people in conflict areas are often characterized by the experience of traumatic events frequently accompanied by loss and separation. These can equally trigger symptoms of posttraumatic stress disorder (PTSD) and complicated grief (CG).
Philipp Jann +3 more
wiley +1 more source
Dianci bileiqi, 2020 为了准确计算雷击杆塔时塔身的电压响应,针对杆塔的冲击特性已经开展了大量的研究,但这些研究大多针对单独的杆塔,未考虑线路中杆塔的情况。本文基于FDTD方法建立了雷击杆塔的计算模型,并通过设置电压引线和电流引线模拟了测试回路存在的情况。雷击杆塔时杆塔的冲击特性与电流波形密切相关,雷电流下杆塔的冲击特性介于阶跃电流和斜波电流下的冲击特性之间。当只考虑流入杆塔部分的电流和塔顶电位时,带线路杆塔的冲击阻抗取值与单独杆塔的冲击阻抗取值几乎无区别。对杆塔的冲击阻抗进行测量时 ...
李伟 +6 more
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Dianci bileiqi, 2014 研究了在连续雷电冲击电流（8/20μs）作用下,35 kV金属氧化物避雷器小电流特性与残压特性的变化规律,以及避雷器内部电阻片的老化特点及失效方式。35 kV避雷器受到连续雷电冲击时,存在一冲击阈值（850次）,当冲击次数低于该阈值时避雷器小电流及残压特性几乎不变,当冲击次数大于该阈值时,避雷器小电流及残压特性发生明显劣化;雷电冲击造成避雷器的失效主要是由内部电阻片沿面闪络引起的,并在避雷器接地端首先发生沿面闪络现象;氧化锌电阻片受到雷电冲击后性能出现方向性差异。该研究为35 ...
王辉 +5 more
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Research on time–frequency characteristics of electromagnetic signals from coal and rock blasting based on DBO-VMD filtering [PDF]
In shaft mining, conventional vibration monitoring of blasting operations is often affected by environmental factors and system limitations, complicating the extraction of coal–rock rupture signals.
Dazhao SONG +7 more
core +1 more source
Dianci bileiqi, 2019 为了更深入掌握雷电冲击下大型变电站接地网的暂态特性,指导变电站的防雷接地设计,建立了大型变电站雷电冲击暂态特性的仿真模型。在此基础上,使用矩量法（MOM）在不同土壤电阻率、不同地网边长、不同网孔大小以及不同雷电流波头时间等情况下分别进行了接地网的雷电冲击暂态特性的仿真计算。结果表明:土壤电阻率越大,接地网的冲击接地特性越呈现出阻性;地网面积越大,接地网的冲击接地特性越呈现出感性;网孔大小对接地电阻的影响不明显,当网孔边长从50 m下降到10 m时,接地网的工频接地电阻与冲击接地电阻分别下降了22.95 ...
李冠华, 金鑫, 赵义松
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Gaoya dianqi, 2020 GIS在开关分闸后母线上会存在幅值较高的残余直流电压,由于GIS中电荷泄漏较慢,残余直流电压可持续作用较长时间。当再一次合GIS母线时,母线上可能会出现冲击过电压,冲击过电压会与母线残余直流电压叠加,使GIS处于直流叠加冲击电压的作用下。近年来国内多起GIS击穿事故发生于开关合闸瞬间,因此有必要对直流叠加冲击电压下GIS的放电特性进行研究。首先介绍了直流叠加冲击电压下稍不均匀电场和极不均匀电场中SF6气体间隙的放电特性和放电机理,以及直流叠加冲击电压下自由金属微粒引起的气体间隙放电特性 ...
傅中 +4 more
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