Results 41 to 50 of about 35,480 (205)

Beyond Motivation: Modeling the Predictive Role of L2 Pride in Informal Digital Learning of English

open access: yesInternational Journal of Applied Linguistics, Volume 35, Issue 4, Page 1938-1952, November 2025.
ABSTRACT This study investigates the role of second language (L2) pride—an understudied affective factor—in shaping learners’ language learning motivation and involvement with informal digital learning of English (IDLE). Drawing on questionnaire data from 1388 Chinese university EFL students, the study employs structural equation modeling to examine ...
Minlin Minny Zou   +3 more
wiley   +1 more source

总糖作为油浸变压器纸绝缘热老化新特征量的可行性研究

open access: yesGaoya dianqi, 2020
对油中纸绝缘材料在不同温度条件下进行加速热老化试验,以绝缘纸聚合度作为诊断纸绝缘老化程度的标准,采用蒽酮比色法测量了老化油样中的总糖含量,探究油中总糖、糠醛与聚合度的相关性关系。研究表明:聚合度在1 000~600范围内对应的油样中的总糖含量均随着聚合度降低而逐渐增大且总糖含量比糠醛含量变化更显著,故在老化前中期阶段,油中总糖可作为新的特征量来表征油纸绝缘老化程度;聚合度在600~200范围内对应的油样中总糖含量未呈现出统一的变化规律,故在老化中后期阶段,总糖无法用来表征油纸绝缘老化程度 ...
付强   +4 more
doaj  

Roll of skin antioxidant system in UV irradiation and epidermalmorphogenesis/differentiation [PDF]

open access: yes, 2012
科学研究費助成事業(科学研究費補助金)研究成果報告書:若手研究(C)2009-2011課題番号 ...
Kawachi Yasuhiro   +2 more
core  

Spatial Phylogenetic Analysis of Chinese Lizards: Insights Into Ecological Drivers and Conservation Gaps 中国蜥蜴系统发育的空间分析:生态驱动因素与保护空缺

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 430-441, September 2025.
Our study identifies southern China, including mountainous regions and islands, as key areas rich in phylogenetic diversity, and phylogenetic endemism of lizards that are currently under‐protected. Current protected areas however do not adequately cover regions that are critical for preserving the evolutionary history of lizards.
Tao Liang (梁涛)   +8 more
wiley   +1 more source

基于频域介电谱和多输出支持向量回归的变压器油纸绝缘状态评估

open access: yesGaoya dianqi, 2018
为分别评估变压器油纸绝缘的老化程度和水分含量,文中通过加速热老化试验和吸潮实验制备了不同老化程度下含水量不同的油浸绝缘纸试品,测试了试品的介损因数频谱和阻抗相位频谱,分析了老化、水分对油纸绝缘频域介电谱特性的影响。采用多输出支持向量回归算法(multi-output support vectorregression,M-SVR)逼近频域介电谱曲线与油纸绝缘老化和水分之间的非线性映射关系,据此预测油纸绝缘试品的老化程度和水分含量。研究表明,对于含水量在0.5~5.6%范围内、具有不同老化程度的试品,M ...
杨飞豹   +5 more
doaj  

基于时域介电法的变压器油纸绝缘老化特征参量分析

open access: yesGaoya dianqi, 2020
为提取表征油纸绝缘老化状态特征参量,将时域介电法更好地应用于油纸绝缘老化状态无损检测,在实验室条件下对不同老化程度的油纸绝缘试样进行极化去极化电流法(PDC)试验,并求得其等效模型参数;然后提出系统极点Pi作为油纸绝缘老化特征参量,并建立其与油纸绝缘老化状态关系;最后验证了系统极点用于评估油纸绝缘老化程度评估的可行性。研究结果表明:扩展Debye模型参数对油纸绝缘老化程度比较敏感,特别是时间参数大于1 000 s的极化支路,其时间常数随着老化时间的增加而呈现递增规律;对于时间常数大于1 000 ...
陈明星   +4 more
doaj  

婆婆的原宿 : 遊日本看銀髮市場

open access: yes, 2015
伴隨著人口不斷老化的趨勢,長者群組日益龐大,他們在不知不覺間改變著我們的社會。人口老化雖帶來種種挑戰,但也包含商機,有不少人正看準了這個新興市場 ...
TANG, Pak Hang, Eric
core  

Population Aging and China's Carbon Emissions: Attached the Employment of the Secondary Industry and the Tertiary Industry [PDF]

open access: yes, 2016
面对紧迫碳减排任务的同时,我国提前进入了老龄化社会,日益加快的老龄化进程将对中国碳排放产生何种影响?现阶段减少碳排放与应对老龄化危机对中国经济发展提出了更高的要求,要兼顾二者,优化产业结构,特别是人口产业结构势在必行,伴随着人口年龄结构的老化,人口产业结构调整又将对中国碳排放产生何种影响?带着这些疑问,本文首先定性的分析了人口年龄结构老化对碳排放影响的传导机制,然后以1997-2012年的省级面板数据为基础,采用评估环境影响的经典模型——STIRPAT模型,结合适当的计量研究方法 ...
谭铮
core  

Assessment of the Threat Status of Bent‐Toed Geckos (Cyrtodactylus) in Indochina: Implementation of the One Plan Approach

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 464-475, September 2025.
This study investigates the diversity, conservation status, distribution, and discovery rate of 84 Cyrtodactylus species in Indochina. Despite rising discovery rates, many species are unassessed, with over half unprotected and 90.5% endemic. This study suggests expanding protected areas and implementing an integrated approach to conservation with IUCN ...
Matilda Julia Lasota   +6 more
wiley   +1 more source

硅橡胶材料表面老化及其对绝缘性能的影响

open access: yesGaoya dianqi, 2003
通过对硅橡胶材料的表面腐蚀、化学腐蚀以及老化引起污秽层形成这3种老化途径的机理分析,表明硅橡胶具有极好的抗老化性。同时,指出漏流径形成是造成硅橡胶老化的最主要原因。盐雾试验证明,老化引起绝缘性能降低后,经过一段时间,硅橡胶表现出本身具有自恢复性。
田可新
doaj  

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