Results 41 to 50 of about 3,074 (165)
Dianci bileiqi, 2014 在已有的防雷措施的基础上,参照电力系超高压防雷的措施,提出了针对铁路的防雷击的保护新方法,即采用相对固定距离保护间隙与氧化锌避雷器串联后再与线路绝缘子并联。能够结合断路器及自动重合闸等继电保护装置有效对10 kV铁路线路在遭受感应雷击的情况下进行保护,有效减少停车事故。
赵啟旸 +4 more
doaj
Study on the risk factors for intrauterine infection of hepatitis B virus among pregnant women [PDF]
, 2017 目的探讨厦门市孕妇乙型肝炎病毒(hepatitis B virus,HBV)感染情况和HBV宫内感染的影响因素。方法在1; 064名孕妇第一次到医院建立孕产妇保健卡时进行问卷调查并检测其血清乙肝标志物,根据检测结果选择外周血乙型肝炎表面抗原(hepatitis B; surface antigen,HBsAg)阳性的产妇179例随访至其分娩,并采集其分娩时的脐血和胎盘组织。对脐血进行HBsAg和HBV; DNA的检测,对胎盘组织进行HBsAg的检测。采用chi ...
刘惠芬 +9 more
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Wildlife Letters, Volume 2, Issue 3, Page 140-148, September 2024.There was not a statistically significant change in the number of calls made to the Florida Fish and Wildlife Conservation Commission regarding human‐wildlife conflict when COVID‐19 pandemic protective measures were in place in 2020, but there was a significant increase in calls in 2021.
Rachael Diaz +3 more
wiley +1 more source
Dianci bileiqi, 2016 对山西煤矿集团鑫顺矿业35 k V变电站现有的进线线路绝缘配合、主变变压器接地以及变电站内部设备防雷措施进行了风险评估,并提出线路加装保护间隙、对变电站进行进线段保护设计、杆塔安装冲击散流装置、主变接地系统外引环形接地网以及变电站内部采用特种防雷变压器等精细化、差异性防雷改造措施,同时在实验室对保护间隙进行50%U的冲击试验,得出保护间隙最佳距离,并采用电磁暂态软件ATP-EMTP对线路安装保护间隙、外引环形接地网进行仿真计算和验证,从而得出此种精细化、差异性防雷改造措施。
祁美华 +3 more
doaj
中西医结合护理This paper summarized the postoperative nursing measures for a patient undergoing left-sided pneumonectomy for lung cancer. Based on the concept of enhanced recovery after surgery (ERAS), comprehensive nursing interventions such as exercise training ...
ZHU Yachao (朱娅超) +2 more
doaj +1 more source
Design and Implementation of Interactive TV Security System of Broadcast and TV Network Group [PDF]
, 2016 广电互动电视业务随着“多业务”运营的深入不断发展，互动电视业务系统的建设需要考虑业务发展的多样性，还需要考虑不断用户增长的扩展性。作为“可运营、可管理”不可分割的一部分，互动电视业务系统的安全性至关重要。随着网络的快速发展和应用技术的飞速进步，系统安全越来越重要，针对互联网的黑客破坏攻击逐渐由网络层迁移到系统层以及应用层。各种新颖类型的黑客、病毒、漏洞攻击和常见的不规范操作都很都很大概率严重威胁到互动点播平台。有线电视用户在享受稳定服务的过程中，也存在着遇到各种安全风险的可能 ...
林动
core
World Medical &Health Policy, Volume 16, Issue 2, Page 116-133, June 2024.Abstract Although tobacco control efforts have been successful at reducing the rate of tobacco use in the general population, rates of use among low‐income populations persist. As a leader in tobacco control efforts, the U.S. state of California recently issued regulations regarding comprehensive tobacco cessation service requirements for state ...
Sara W. Yoeun +2 more
wiley +1 more source
Gaoya dianqi, 2007 在遭受过电压、过电流等极端情况时,电子式互感器易受冲击而导致性能下降或损坏。以一种有源电子式电流互感器为例,介绍了其在极端情况下的各环节,如LPCT（低功率电流互感器）、Rogowski线圈、高压侧电源系统和高压侧信号处理电路等的防护问题,并给出了相应的措施及其设计依据。对防护措施引入的误差进行了分析,指出通过选择合适的标称电压,可以减弱防护器件性能对测量准确度的影响。型式试验结果表明,采用该措施的一种电子式电流互感器满足IEC 0.2级要求,验证了所提出措施的有效性。
王鹏 +4 more
doaj
Chosen message attacks method against ECC implementations [PDF]
, 2014 Chosen-message side-channel analysis attacks for public-key cryptosystems based on scalar multiplications was proposed, where special input point P is chosen to have the features of special y-coordinate to generate noticeable variations on power ...
Hui-yun LI +3 more
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Conservation Biology, Volume 38, Issue 2, April 2024.Abstract Aquaculture can provide foraging habitat for birds, but it can also result in intentional and accidental mortality. We examined an overlooked conflict between razor clam (Sinonovacula spp.) aquaculture and declining shorebirds in southeastern China's Fujian and Zhejiang provinces.
Dan Liang +10 more
wiley +1 more source