Results 21 to 30 of about 1,713,702 (163)
Gaoya dianqi, 2013 针对在役复合绝缘子的老化问题,笔者分别对实验室电晕老化和现场自然老化的HTV硅橡胶材料的憎水性、泄漏电流、表面微观形貌以及化学成分等特性进行了对比研究。结果表明,电晕老化与现场老化造成材料特性变化的规律呈现一致性:电晕老化造成材料憎水性下降,且提高电晕老化强度（电压和时间）则导致憎水性恢复变慢,甚至不能完全恢复;现场老化材料的憎水性随年限不断下降,由HC1级（2年）降至HC5级（15年）。老化还造成样品的表面电阻率下降,引起表面泄漏电流增加;老化造成硅橡胶材料降解,表面缺陷增加,孔洞增加并加深 ...
申文伟 +6 more
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Integrative Conservation, Volume 5, Issue 1, Page 137-149, March 2026.Pometia pinnata demonstrated life‐stage‐specific genetic responses to landscape features, with asymmetric gene flow patterns and population recovery following historical bottlenecks, revealing complex topographic and demographic influences on forest genetic structure.
Madhuparna Chatterjee +5 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Fluxgate sensors with Co‐rich amorphous microwires, widely used for their low noise in magnetic field measurements, encounter significant challenges in high‐temperature environments such as well drilling and geological exploration. Prolonged thermal aging degrades the performance of Co‐rich amorphous microwires, resulting in increased noise ...
Lining Pan +10 more
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Dianci bileiqi, 2010 研究添加不同的减缓老化作用的元素及化合物,以改善ZnO压敏电阻片长期带电的老化特性。经过添加GF-06银玻璃、氧化硼、PM-10硼玻璃等不同形态的材料,在同样的ZnO压敏电阻的制作工艺下进行混合、造粒、成形、烧成形成直径为53 mm的电阻片,测试了小电流特性、大电流特性及115℃下1 000 h的加速老化试验。试验结果表明,微量的Ag2O玻璃和B2O3玻璃有利于提高ZnO-Bi2O3系压敏电阻片的老化寿命;同时B2O3还有助于改善ZnO电阻片的大电流下的非线性。
王玉平, 彭敏, 徐素萍, 王李瑛
doaj
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The limited osteogenic capacity of magnesium phosphate cement (MPC) has constrained its biomedical applications, underscoring the necessity to develop MPC with enhanced physical properties and bone‐forming capabilities. In this study, a multifunctional MPC system was developed by incorporating zoledronic acid‐loaded near‐infrared (NIR ...
Bin Wang +8 more
wiley +1 more source
, 2014 目的考察老化态度在工作记忆老化中的作用。方法分别使用横断数据和干预数据分析老化态度对工作记忆老化的影响模式。对43名75~95岁城市养老院老老年人实施数字工作记忆广度和老化态度测验。随机选取20名被试者作为干预组接受工作记忆训练。结果积极的内隐老化态度与较大的数字工作记忆广度关系密切。工作记忆训练取得中度效果(ES=0.59);但内隐与外显老化态度得分与工作记忆干预收益相关均不显著。结论老化态度在工作记忆老化中的作用可能更多地表现为对固有工作记忆能力的保护。
彭华茂, 彭华, 尹述飞, 茂文静
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四川大学学报. 自然科学版, 2005 测量了经18年自然老化后的TGS单晶的微分电滞回线,发现回线的形状与未老化的样品类似,故称其为隐性老化.老化的样品经热处理后,回线峰位,峰高出现显著变化,甚至出现双峰,表现出明显的老化特性,隐性老化被显性化了.老化的原因可归结为环境空气中的水分子吸附在晶片四周表面上,使晶体有些微区水解形成缺陷;以及这些缺陷向晶体内的扩散.
罗劲明 +4 more
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Gaoya dianqi, 2022 依据油纸绝缘时域介电响应介电谱及其能量谱，定义了两个能反映油纸绝缘老化程度的新特征量——去极化能量初始斜率SW和去极化能量半衰期thalf。通过测试样本分析确定了SW、thalf与油纸绝缘老化程度之间的关联性，验证了其作为绝缘老化指标在油纸绝缘老化评估中的有效性。针对复合油纸绝缘介电特征量，提出了一种新的未确知测度理论的绝缘老化特征指标综合评估体系。建立了绝缘老化评估结构层次与评价指标分级区间，在复合特征指标的权重分析基础上，引入未确知测度理论，针对其中等级评定环节的主观性问题 ...
舒恺, 高飞翎, 余萃卓, 苏凯强
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International Journal of Applied Linguistics, Volume 36, Issue 1, Page 522-539, February 2026.ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
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New Directions for Child and Adolescent Development, Volume 2026, Issue 1, 2026.Background Working memory updating is crucial in bilingual children′s second language (L2) reading comprehension. A robust updating ability is a cognitive key for children to successfully master L2 reading comprehension. Objective This study is aimed at investigating the effect of updating ability on the L2 Chinese reading comprehension among Uyghur ...
Guangxin Li +3 more
wiley +1 more source