Results 21 to 30 of about 10,053 (134)
An AC constant current power supply design based on linearity power amplifier [PDF]
, 2008 交流恒流源作为稳定电源的分支有广泛用途，其作为一项技术在电源的研究领域中有很重要的意义。其发展与科技的进步息息相关，在各个国家特别是发达国家的国民经济中占有十分重要的地位。近年来我国检测技术有了较大的提高，但同发达国家的电网检测技术相比，差距仍然很大，存在参数检测精度不高、抗干扰性较差,实时性比较差、电路设计复杂等缺点。针对这些问题，本课题建立了一个以AT89C51单片机为控制核心的恒流源控制系统，该系统具有速度快、精度高、实用性强、电路模块化等特点。 本课题已经顺利完成以下几部分内容： 1硬件控制系统：
周景迁
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Beyond Motivation: Modeling the Predictive Role of L2 Pride in Informal Digital Learning of English
International 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
Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019 目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua +6 more
wiley +1 more source
Characteristic Straight Lines For Paste-mixing in Sealed Lead Acid Batteries [PDF]
, 1994 表述湿膏密度与加酸量和总水量关系的和膏直线对铅酸蓄电池电极制备是十分重要的。本文给出建立和膏直线的方法,它们与实验数据符合。讨论了和膏直线应用于加酸量对正极(？)电曲线影响的试验设计。实验表明在足够电解液中,5小时放电率的正极活物利用率可达54%。The characteristic straight lines For paste-mixing,showing the relations of we -paste density with the amounts of water and ...
林秀治, 郑君铣, 陈体衔
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Methods in Ecology and Evolution, Volume 15, Issue 11, Page 1926-1939, November 2024.Abstract Simulation studies are essential tools to assess statistical methods. Functioning as controlled experiments, simulations generate data from known underlying processes. However, unclear or incomplete reporting of simulation studies can impact their interpretability and reproducibility, potentially leading to the misuse of statistical methods ...
Coralie Williams +6 more
wiley +1 more source
Gaoya dianqi, 2018 高压交流断路器的大容量短路开断与关合试验具有技术高、难度大、电磁暂态过程复杂等特点,短路开断与关合试验是断路器研究、开发过程中必备的关键性环节,起着考核断路器开断与关合短路故障的重要作用,同时也是断路器产品开发、研制的重要依据。文中首先论述了大容量试验的意义与实现,然后介绍了大容量试验站的类型以及一些关键的试验回路和试验设备,最后分析与讨论了大容量短路试验原理与试验技术。文中的内容为实施、开发与研究大容量短路开断与关合试验及试验技术提供了参考与依据。
李刚 +5 more
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Veterinary Dermatology, Volume 35, Issue 4, Page 418-431, August 2024.Background – Diagnosis of canine adverse food reactions (AFRs) is based on vague criteria, such as ‘>50% improvement’ during elimination diet trial (EDT) followed by ‘deterioration’ during provocation test (PT). Objective – The objective of the study was to use predefined criteria to evaluate response during EDT [i.e., Owner Global Assessment of ...
Evi I. Sofou +4 more
wiley +1 more source
Elephant conservation in India: Striking a balance between coexistence and conflicts
Integrative Conservation, Volume 3, Issue 1, Page 1-11, March 2024.India harbors the largest population of Asian elephants in the world. The institutional, policy, and legal instruments that enable sustaining elephant population in India were elaborated in the article. Abstract In the human‐dominated epoch of the Anthropocene, nations worldwide are trying to adopt a variety of strategies for biodiversity conservation,
Ramesh K. Pandey +4 more
wiley +1 more source
Gaoya dianqi, 1989 西安高压电器研究所是我国高电压和大容量试验研究基地。大容量试验室现已装有两台2500MVA的短路发电机和一套合成试验装置,在大容量测试技术方面,它具有雄厚的技术开发力量和丰富的运行、维修经验。
本刊编辑部
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Gaoya dianqi, 2015 断路器均压电容器对改善断路器断口间电压分布起着重要作用,进行断路器端口均压电容的预防性试验是掌握其运行状况的可靠方式。笔者对某变电站500 k V瓷柱式断路器断口均压电容进行了不同接线方式测量时电容量的影响因素分析,以及通过对出厂试验数据、交接试验数据以及预防性试验数据及试验工况的比对,分析不同测试工况下断路器断口均压电容测试影响因素及影响程度。在对断路器断口整体电容测试采用反接线测量时,电容值增量约在110 p F左右;采用正接线测量时,电容值增量约在40 p F左右;为便于运行后电容值的监视 ...
钱国超 +6 more
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