Results 61 to 70 of about 5,524 (189)
±1100 kV昌吉换流站与±800 kV天山换流站共同作用的直流偏磁问题研究
Gaoya dianqi, 2020 针对±800 kV天山—中洲特高压直流输电工程和±1 100 kV昌吉—古泉特高压直流输电工程同时以单极大地方式运行时,新疆电网内厂站面临的变压器直流偏磁风险,提出了研究方法和应对策略:首先,利用电磁测深对两接地极周边土壤进行了冬夏两季实测,在实测的土壤电阻率基础上构建了两接地极同时作用下的电网直流电流分布模型;其次,对新疆电网直流偏磁风险进行仿真计算分析,发现不同季节土壤电阻率不同,且冬季直流偏磁风险较大,两双接地极同时注入直流时,原本没有直流偏磁风险的厂站也会存在风险;最后 ...
孙冰 +5 more
doaj
Zhejiang Daxue xuebao. Lixue ban, 2005 通过分析太阳黑子、赤道平流层纬向风与西北太平洋上热带气旋的关系发现，赤道平流层纬向风的准两年振荡与西北太平洋上热带气旋确实具有很好的关系，这种关系受到太阳活动的调控.当太阳黑子为小年时，在赤道纬向风的西风年，西北太平洋上生成的热带气旋较多，强度偏弱；东风年，气旋较少，强度较强.在太阳黑子大年，与小年的情况相反，东风年时热带气旋较多，强度较弱；西风年，气旋较少，强度较强.
TIANRong-xiang(田荣湘)
doaj +1 more source
Design of BT620S Stereo Bluetooth Headset [PDF]
, 2009 蓝牙技术是一种无线数据与语音通信的开放性全球规范，它以低成本的近距离无线连接为基础，为固定与移动设备通信环境建立一个无缝连接。现今，蓝牙技术在实际中已经有广泛的应用。由于手机的普及率较高，因此蓝牙手机成为目前蓝牙技术的主要应用，而与之相匹配的蓝牙耳机则以其便携性和安全性等特点也正在逐渐受到消费者的青睐。因此，设计出一种具有功能强、性能高、成本低的蓝牙耳机已成为蓝牙技术领域的一个重要课题。 本文设计了一种型号为BT620S的立体声蓝牙耳机。从硬件、射频、软件和声学几个方面详细介绍了整个设计过程。 在电路中，
张玉强
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, 2021 Objective To explore the clinical effect of Traditional Chinese Medicine (TCM)decoction cupping combined with wet compress therapy in the treatment of hemiplegia caused by stroke.
HU Zhe (胡哲) +4 more
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Policy &Internet, Volume 16, Issue 4, Page 801-817, December 2024.Abstract Disinformation concerns have heightened the importance of regulating content and speech in digital communication environments. Perceived risks have led to widespread public support for stricter control measures, even at the expense of individual speech rights.
Adrian Rauchfleisch, Andreas Jungherr
wiley +1 more source
Assessing the risk of overexploitation to a tarantula species in the pet trade
Conservation Biology, Volume 38, Issue 5, October 2024.Abstract The global pet trade in invertebrates remains poorly understood and underrepresented in policy and research. Tarantulas are a highly traded invertebrate group. Many individuals in trade are wild caught, and trade regulation is often lacking, raising concerns about the effect of trade on local ecosystems and populations.
Shannon Noelle Rivera +4 more
wiley +1 more source
偏头痛增加缺血性卒中风险的研究进展 Progress of Correlation of Migraine and Ischemic Stroke
Zhongguo cuzhong zazhi, 2018 流行病学数据已证实偏头痛可能增加缺血性卒中风险，神经影像学研究也显示偏头痛与 脑结构异常有关。但联系偏头痛与缺血性脑疾病的可能病理生理机制尚不完全清楚，可能的假说包 括药物和生活方式等外界因素影响、内皮功能障碍和凝血异常、皮层扩散抑制等。本文就近年来偏 头痛增加缺血性卒中风险的流行病学、神经影像学和遗传学的证据，以及目前涉及的可能的主要病 理生理机制给予综述。 Abstract: The previous studies have demonstrated migraine may be a
崔淑慧，陈宁，何俐
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, 2010 饮食养生是道教养生学重要内容之一。道教饮食注重因时制宜、因人制宜、因地制宜。“三因制宜,以膳颐养“的原则和方法,体现了道教养生学人天合一的整体观念和辨症施养的指导思想。国家社科基金特别委托项目“百年道教研究与创新工程”(09 ...
黄永锋
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World Medical &Health Policy, Volume 16, Issue 3, Page 376-404, September 2024.Abstract The COVID‐19 pandemic has created uncertainty and controversy around risk‐related issues such as vaccine mandates. People expressing their opinions on these issues to important others, such as employers, may face significant consequences, such as rewards or rejection.
Timothy K. F. Fung +2 more
wiley +1 more source
Risk, Hazards &Crisis in Public Policy, Volume 15, Issue 2, Page 104-127, June 2024.Abstract Social media and crowdsourcing (SMCS) are increasingly used as tools to govern disasters. Nevertheless, we have a limited understanding of how these technologies support disaster risk management (DRM). Based on a comprehensive literature review of 237 papers, we present a state‐of‐the‐art of the research field linking SMCS with DRM.
Anne B. Nielsen +4 more
wiley +1 more source