Results 21 to 30 of about 25,216 (138)
Gaoya dianqi, 2014 选相控制技术在抑制电力系统暂态冲击方面,较传统的安装合闸电阻、增设避雷器等方法更具经济性和先进性。随着智能变电站技术的应用和推广,智能化对选相控制技术提出了新的要求。笔者阐述了智能化选相控制设备的过程层接口实现、过程层数据通讯及设备安装方式,根据智能组件功能集成程度提出了智能选相控制设备两种不同的实现模式,并讨论了该设备的IEC 61850建模及信息交互方式,最后对选相误差控制技术及高级应用进行了总结和展望。
须雷 +5 more
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Dianci bileiqi, 2021 为突破谐振接地系统选线瓶颈,提出一种动态电阻选线方式,运用理论分析和ATP-EMTP仿真试验,确定了选线程序启动方式与动态电阻阻值选取办法。其次通过分析电路模型,得到动态切换为电阻接地方式后的阻性注入电流表达式。最后在国网配电智能化应用及关键设备联合实验室进行现场试验,验证了在谐振接地系统发生永久性单相接地故障时,动态电阻选线方式能准确识别故障发生,判断故障性质,通过阻性电流注入准确选出故障线路,过渡电阻识别能力达到3 500Ω,为谐振接地系统单相接地选线难题提供了一种有效可行的实际解决办法。
孙益辉 +5 more
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Defining and identifying relevant stakeholders to advance effective conservation
Conservation Biology, EarlyView.The challenge of defining stakeholders in environmental science and an approach for refining existing definitions. Abstract Stakeholder is a contested term that has spawned a multitude of ad hoc definitions. The ambiguity of these definitions has oftentimes impeded transdisciplinary research in environmental governance and conservation science because ...
Milan Büscher +5 more
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Dianci bileiqi, 2022 谐振接地系统单相接地故障的快速就近隔离是配网稳定安全运行的基础，短时改变中性点接地方式产生脉冲电流进行选线成为近年来研究的热点。本研究采用matlab&simulink搭建具有脉冲信号发生装置的谐振接地系统(架空线系统、电缆线系统、缆线混合系统)。在3种系统下，设置任意线路在不同条件下发生单相接地故障，提取各线路脉冲电流进行傅里叶分解，观察故障线路与非故障线路脉冲电流在频域分布上的差异，提出利用脉冲电流在频域分解的直流分量与基波分量之和作为选线依据；通过设置典型的故障点位置、故障相合闸相角 ...
李景丽 +5 more
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Zhejiang Daxue xuebao. Lixue ban, 2007 制备出一种新型弱酸性非抑制电导检测阳离子色谱固定相，并通过对色谱条件的摸索选择，成功实现了常见一价、二价阳离子的分离检测，以及过渡金属离子Ni2+，Mn2+的分离检测.选用甲基磺酸溶液（2 mmol • L-1）和草酸（0.5 mmol• L-1）的混合液作为流动相，一步分离并测得了Li+、Na+、NH4+、K+、Mg2+、Ca2+ 6种阳离子的检测限和线性范围.选用酒石酸（2 mmol• L-1）和草酸（1 mmol • L-1）的混合溶液为流动相，成功分离并测得了过渡金属离子Ni2+，Mn2 ...
GUOYan-ru(郭龑茹) +2 more
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Perceived costs as drivers of wildlife management preferences in rural Tanzanian communities
Conservation Biology, EarlyView.Abstract Effectively managing human–wildlife interactions is crucial for fostering coexistence on shared landscapes. Management options are most effective when aligned with the preferences of people directly affected by wildlife, yet little is known about how socioecological factors influence these preferences.
Christian Kiffner +10 more
wiley +1 more source
Shiyou jixie, 2012 为解决因流量、油水比变化及两相流态的复杂性所带来的井下文丘里管油水两相测量精度和设计选型等问题，根据多相流理论及计算方法，在不同入口流量、不同油水比条件下，模拟计算3种不同文丘里流量计的油水两相流场并进行方案优选。计算结果表明，介质接近油相或水相时，两相流态分别接近层流或湍流。流体经文丘里喉部后，油水两相分层特征显著。根据多相流计量精度的需要，通过CFD计算对比，优选出小流量下压降随液体粘度有显著变化的文丘里管设计方案。
黄思, 关玉慧, 冯定, 马卫国
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A Systematic Scoping Review of Self‐Regulated Learning With AI in Language Education
International Journal of Applied Linguistics, EarlyView.ABSTRACT The rapid development of artificial intelligence (AI) technology has brought new opportunities for second/foreign language (L2) education while also raising concerns about the use of AI tools. This systematic scoping review provides a snapshot of the current state of research situated at the intersection of self‐regulated learning (SRL) and AI
Zheng Zhang, Sihan Zhou, Barry Bai
wiley +1 more source
Gaoya dianqi, 2003 随着中压电网中性点不接地供电网系统的不断扩大,单相接地电容电流也在不断增加,正确判别电网接地点,是关系到电网运行可靠性的关键技术问题。笔者就目前电网的单相接地选线方法进行了分析和探讨,指出采用零序电流相对相位法和零序电流5次谐波法选线所存在问题,提出利用单相接地故障时出现的零序分量的特点,从“能量”观点实现选线的新方法。
崔联广 +3 more
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International 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