Results 1 to 10 of about 2,787 (104)

Synthesizing habitat connectivity analyses of a globally important human‐dominated tiger‐conservation landscape

open access: yesConservation Biology, Volume 36, Issue 4, August 2022., 2022
Abstract As ecological data and associated analyses become more widely available, synthesizing results for effective communication with stakeholders is essential. In the case of wildlife corridors, managers in human‐dominated landscapes need to identify both the locations of corridors and multiple stakeholders for effective oversight.
Jay M. Schoen   +13 more
wiley   +1 more source

Factors affecting job satisfaction among acute care nurses working in rural and urban settings 城乡急诊监护护士工作满意度的影响因素

open access: yesJournal of Advanced Nursing, Volume 76, Issue 9, Page 2359-2368, September 2020., 2020
Abstract Aims To: (a) identify the differences and similarities in the extrinsic and intrinsic factors that influence job satisfaction among nurses in urban and rural Ontario; and (b) determine the impact of job satisfaction on nurses’ turnover intention among nurses working in rural and urban settings in Ontario.
Yasin M. Yasin   +3 more
wiley   +1 more source

双回并行敷设高压电缆零序护层电流计算及负荷相序优化方法

open access: yesDianci bileiqi, 2022
随着城市电网电缆化率不断提高,同隧道内两回高压电缆并行敷设的线路日益增多。由于两回线路间的互相影响,可能会引起电缆护层电流过大,危及电缆安全运行。针对目前双回电缆护层电流特征并不明确的问题,建立了双回电缆护层电流计算模型,分析得到了双回电缆护层电流具有幅值相位都相同的零序特征。应用建立的模型对某双回电缆线路不同负荷时的护层电流进行了计算,计算结果与工程实测结果误差不超过9.2%,解释了该线路护层接地电流异常的原因。对不同相序下护层电流与负荷电流之间的关系进行了研究,结果表明 ...
苑玉宽   +5 more
doaj  

谐波过电压下电缆护层保护器泄漏电流特征分析

open access: yesDianci bileiqi, 2023
随着我国多种形式的新能源接入系统,系统暂态过电压问题逐渐显现,持续的高次谐波过电压会导致电缆护层保护器发热甚至爆炸。为了探究高次谐波过电压下电缆护层保护器泄漏电流特征变化规律,本研究搭建了模拟谐波过电压冲击实验平台,对高温老化后的保护器进行谐波过电压实验,分析了总泄漏电流、阻性电流、相位差、阻值等受电压幅值及频率的影响规律。实验结果表明,老化时间每增加100 h,保护器内部电阻减小5%~29%,且实验温度每升高20℃,阻性电流增大11%~38%;当温度为40℃时 ...
方春华   +7 more
doaj  

International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder – Chinese (Mandarin) translation

open access: yesDevelopmental 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

基于首端护层电流的海底电缆故障诊断方法

open access: yesGaoya dianqi, 2022
长距离海缆存在行波信号严重衰减的问题,与陆上电缆相比缺乏可靠的故障监测手段。为了及时发现海缆线路故障,基于海缆首端护层电流的实时测量数据,提出一种针对海缆两端直接接地系统的故障在线监测与诊断方法。通过建立海缆护层等效电路模型,分析海缆护层接头开路、线芯接地短路和相间短路等3类典型故障,阐明首端护层电流在线监测的基本原理。对不同类型的海缆故障进行仿真分析,获取首端护层电流的幅值及相位特征,以不同护层回路故障电流和正常电流幅值与相位的比值构造特征参数,建立故障判定依据并进行故障诊断 ...
任乐朋   +3 more
doaj  

高压柔性直流电网多端控制系统架构和控制策略 [PDF]

open access: yes全球能源互联网, 2018
在分析各种运行方式下高压柔性直流电网控制目标的基础上,提出基于上层控制的高压多换流站协调控制系统架构,在此基础上设计了换流器双极有功、无功和交流电压闭环控制策略,针对柔性直流电网应用,设计了双极协调控制方法,在控制保护仿真系统上进行了动态性能验证,并提出高压直流电网在有、无通信条件下统一的多换流器协调控制策略,控制保护系统联合RTDS组成闭环数模仿真系统,在仿真系统上对多换流器不同通信条件下的统一多换流器协调控制策略进行验证,证明了所提策略的有效性和正确性。
胡兆庆   +5 more
doaj   +1 more source

牵引站220 kV侧电缆护层谐波过电压特性

open access: yesDianci bileiqi, 2023
高速铁路特殊运行方式会产生大量的谐波,谐波会通过牵引变压器传入220 kV侧高压电缆,在电缆护层上产生谐波电压,威胁电缆的安全运行。笔者在牵引变电所现场实测谐波数据的基础上,建立了基于实测数据的谐波源模型,解决了谐波源建模复杂的问题并能准确反映出高铁列车的实际运行状况。在此基础上仿真计算了高铁在牵引、再生制动和惰性3种工况下220 kV侧电缆护层谐波电压特性,探究了电缆长度、电缆接地方式、谐波电流参数等对谐波电压的影响规律。结果表明:高铁不同运行方式下,护层谐波电压均远超过工频正常运行情况 ...
方春华   +7 more
doaj  

Synergistic Anode/Cathode Optimization Engineering by Hierarchical Porous N‐Doped Carbon Fibers for Efficient Zinc Batteries

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT The poor Zn chemistry of Zn metal anode and sluggish reaction kinetics of cathodes at high mass loadings are two crucial issues for hindering the application of aqueous Zn‐ion batteries (AZIBs). Herein, the hierarchical porous N‐doped carbon fibers (HPNCFs) were proposed to simultaneously optimize the reversibility of Zn plating/stripping of ...
Song Yang   +6 more
wiley   +1 more source

Bifunctional Competitive Structure of Biomass Carbon‐Derived Metacomposites for Tunable ε′‐Near‐Zero and ε′‐Negative Responses

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang   +4 more
wiley   +1 more source

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