Results 21 to 30 of about 1,234,627 (169)

高压SF6断路器的电寿命试验

open access: yesGaoya dianqi, 1999
论述了高压SF6断路器电寿命试验的概况,提出了电寿命试验方法和对电寿命试验结果的处理方法.这种试验方法可以节省试验费用.试验结果的处理方法使得各种产品的试验结果可以进行比较,也可以将试验室试验结果与系统运行的结果进行比较.
金立湘
doaj  

Exploring legal‐ and health‐risk messaging to reduce demand for elephant skin

open access: yesConservation Biology, EarlyView.
Abstract Asian elephants (Elephas maximus) are poached for an illegal trade in their skins, which are used in traditional medicine in Africa and Asia. We explored whether messages about the legal and health risks of using elephant skin for medicinal purposes (stomach illness) could reduce such consumption.
Beilu Duan   +10 more
wiley   +1 more source

高温硫化硅橡胶试品表面染污方法研究

open access: yesGaoya dianqi, 2015
实验室开展硅橡胶材料憎水迁移特性试验时,对试片表面污层均匀分布程度要求很高,目前通用的实验方法为浸污法和涂刷法,这两种方法的刷污效果可能很难满足试验要求。文中针对高温硫化硅橡胶(HTV)材料的各种染污方法,以HTV平板试片为对象,对比分析了多种染污方法,并提出了弓弦法的试验方法。弓弦法利用水膜的表面张力来获得理想污层,并可同时实现高精度定量均匀染污的试验目的。试验结果表明,浸污法无法实现定量分析的实验场合;利用弓弦法可以试验试片表面均匀染污;对于结构复杂的复合绝缘子,弓弦法操作较为复杂 ...
魏旭   +4 more
doaj  

Artificial Intelligence for Language Learning: A Systematic Review of its Design, Theoretical Foundations, Implementation, and Impact

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao   +2 more
wiley   +1 more source

UHV断路器非对称电流开断试验方法研究

open access: yesGaoya dianqi, 2013
受设备容量的限制以及传统试验方法的局限,实验室很难对具有较长时间常数的特高压断路器进行非对称电流开断试验。笔者分析了该试验的原理,提出了一种新的电流补偿的试验方法。通过计算分析,论证了试验方法的等价性。1 100 kV断路器非对称电流开断试验采用了该试验方法,并顺利完成了多台产品的试验。这种试验方法还进行了推广应用,成功地完成了发电机断路器的非对称电流开断试验。
李刚   +6 more
doaj  

Comparing the Effects of Collaborative and Independent Writing on EFL Learners’ Individual Writing Performance: An Intervention Study

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Collaborative writing has attracted increasing attention in English as a Foreign Language (EFL) instruction due to its potential to enhance learners’ writing competence. However, few studies have examined the comparative effects of collaborative versus independent writing on EFL learners’ individual performance, especially in higher‐order ...
Ting Huang, Chenze Wu, Wenkang Zhang
wiley   +1 more source

功率模块数不对等的MMC阀段运行试验研究

open access: yesGaoya dianqi, 2018
为了研究功率模块数不对等条件下柔性直流换流阀阀段运行试验方法,文中通过分析阀段运行试验过程中进行模块旁路试验的过程,建立了试验回路电流和模块电压的数学计算模型,提出了功率模块数不对等条件下的阀段运行试验方法。利用PSIM仿真软件对试验方法进行了仿真,并在实际的阀段运行试验中应用了该方法。仿真与试验结果表明,文中设计的试验方法可以实现功率模块数不对等条件下MMC阀段运行试验测试,满足试验要求。
田鸿昌   +5 more
doaj  

Basic income trials and the politics of scale: A research agenda

open access: yesPolicy Studies Journal, EarlyView.
Abstract The growing popularity of basic income has led to extensive trials of the policy in numerous settings across the world. However, analysis of the politics of basic income, and in particular the political dynamics preceding and resulting from trial programs, lags. In response, we propose a research agenda that uses political scale to investigate
Jurgen De Wispelaere   +2 more
wiley   +1 more source

Changing trends in prenatal screening and treatment of cytomegalovirus infection in France: 7‐year national cohort study (2017–2023)

open access: yesUltrasound in Obstetrics &Gynecology, Volume 67, Issue 6, Page 756-763, June 2026.
ABSTRACT Objectives Cytomegalovirus (CMV) is the leading cause of congenital infectious neurosensory impairment. We aimed to present national epidemiological data on maternal CMV infection during pregnancy in France, focusing in particular on primary infection in the periconceptional period or first trimester, and to assess the impact of changes in ...
P. Coste‐Mazeau   +176 more
wiley   +1 more source

Prospective comparison of diagnostic accuracy of ultrasound, PET/CT and DW‐MRI for preoperative assessment of pelvic lymph nodes in cervical cancer patients: results of the CANNES trial

open access: yesUltrasound in Obstetrics &Gynecology, Volume 67, Issue 6, Page 836-851, June 2026.
ABSTRACT Objective To determine whether ultrasound is non‐inferior to positron‐emission tomography/computed tomography (PET/CT) and diffusion‐weighted magnetic resonance imaging (DW‐MRI) in terms of overall diagnostic accuracy for the preoperative assessment of pelvic lymph‐node status in cervical cancer.
F. Frühauf   +14 more
wiley   +1 more source

Home - About - Disclaimer - Privacy