Results 11 to 20 of about 230,771 (168)
MM-convex function & its Jensen-type inequality(MM-凸函数及其Jensen型不等式)
Zhejiang Daxue xuebao. Lixue ban, 2017 考虑函数的广义凸性问题，利用区间上的二元幂平均定义了MM-凸函数，讨论了MM-凸函数的若干判定定理及运算性质，建立了其Jensen型不等式，并给出了Jensen型不等式的等价形式及推论.结果表明，MM-凸函数是比较函数定义区间内任意两点的幂平均函数值与其函数值的幂平均大小所确定的各类凸函数的推广.MM-凸函数概念的引入，为深入研究凸函数和拓展凸函数概念探索了 一条新途径.
SONGZhenyun(宋振云) +2 more
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Gaoya dianqi, 2023 雷电感应过电压是引起配电网故障的主要因素之一。为收集配电线路上的感应雷过电压数据，研究其波形特性，以期用于指导架空配电线路的雷电防护，文中采用了一个自供电、无线传输的雷电过电压在线监测装置，接触测量了配电线路中雷电感应过电压信号。通过对某10 kV配电线路上雷电感应过电压波形进行观测，并根据波形特征获取过电压相关波形参数。结果显示，感应雷过电压主要以高频分量形式叠加至工频相电压，所观察到的感应雷过电压波表现为波头时间短、波尾出现双极性高频振荡，最终衰减到零的特点 ...
徐文华 +7 more
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Fushe yanjiu yu fushe gongyi xuebao本研究旨在制备辐射剂量响应、辐射稳定性优异的塑料闪烁光纤（PSF）及具有优异X射线成像性能与多功能特性的新型闪烁光纤阵列。以稀土配合物和有机物为掺杂剂，采用Teflon法制备红、绿、蓝三色塑料闪烁光纤（分别标记为PSF-R、PSF-G、PSF-B），并通过调控三色塑料闪烁光纤的排布方式和几何结构，制备不同类型的塑料闪烁光纤阵列。结果显示，PSF-R、PSF-G、PSF-B均表现出优异的辐射响应特性，剂量检测限分别为0.555 μGy/s、2.775 μGy/s和2.22 μGy/s ...
刘 碧武 +3 more
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Journal of Adolescence, EarlyView.ABSTRACT Introduction Following rapid iterations in media technologies, Chinese millennials (born between 1980 and 1995) find themselves in a paradoxical state where digital saturation exists alongside fatigue, making them central practitioners of digital minimalist behavior.
Chao Zhang, Yinze Hao, Jingwen Li
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Wildlife Letters, EarlyView.Using radiotelemetry, we found that the movement and home range of the endangered Sacalia bealei varied significantly across reproductive classes and seasons, with males exhibiting greater movement than females during wet and mating seasons. The species exhibits strong aquatic dependence, favoring deep pools interspaced among riffle‐pool sequences ...
Wing Sing Chan +3 more
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Gaoya dianqi, 2021 当±800 kV新东直流正常运行时,±800 kV昆柳龙线路与其部分线段并行,昆柳龙线路感应电压远远高于其他直流线路感应电压。文中利用有限元仿真软件建立新东直流和昆柳龙直流并行线段的二维仿真计算模型,仿真了新东直流输电线路带电运行情况下昆柳龙直流线路的感应电压特性。结果表明:柳北站—龙门站线路在静电场单独作用下,正极感应电压为6 kV,负极感应电压12 k V;在静电场与离子流场的合成电场作用下,正极感应电压为20.7 kV,负极感应电压30.5 kV,这与实际测量结果最高感应电压为42 kV较为接近 ...
杨晓峰 +7 more
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Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, EarlyView.ABSTRACT Research on policy reinvention, where a government modifies rather than replicates policy innovations introduced by other governments, has progressed significantly, but how it is influenced by the government's issue attention has not been thoroughly examined.
Yingxin Zhang, Yixue Yao, Kaifeng Yang
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Near‐infrared (NIR) phosphors with broadband and efficient emission are pivotal for the performance of NIR phosphor‐converted light emitting diodes (pc‐LEDs). In this study, the double perovskite phosphor La2MgTiO6:Cr3+ phosphor with broadband emission in the range of 650–950 nm was prepared.
Xu Qian +7 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Reliable monitoring of ultraviolet (UV) radiation is critical for protecting human health, yet existing sensors often rely on costly or rigid components that hinder portability. Here we report a wearable, low‐cost colorimetric sensor for quantitative UV dosimetry, enabled by radical‐triggered aggregation of gold nanoparticles (AuNPs).
Yahuang Li +6 more
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Dianci bileiqi, 2017 为了有效地对埋地电力电缆进行雷电防护,必须合理分析埋地电缆在雷电电磁脉冲影响下产生的感应过电压。分析了雷电对埋地电缆的危害方式,具体介绍了埋地电缆雷电感应过电压计算方法,在EMTP中搭建实际电缆模型,利用model模块变成计算分段电缆感应过电压。分析埋地电缆截面积、电缆排列方式和电缆埋设深度对电缆中感应电流和护套层感应过电压影响。仿真结果表明:埋地电缆截面积越大,感应电流和过电压也越大;电缆排列方式对电缆中感应电流几乎没有影响,对感应过电压存在一定影响,三角排列方式感应过电压最大;电缆埋设越深 ...
季明丽
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