Results 41 to 50 of about 1,417,005 (147)
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Biodegradable Zn‐based alloys are promising candidates for temporary implants, yet excessive Zn2+ release during degradation may induce cytotoxicity and adverse tissue responses. In this study, Zn‐xBa alloys (x = 0.1 wt%, 0.5 wt%, 1.0 wt% and 3.0 wt%) were developed to achieve controlled corrosion behaviors with improved biocompatibility.
Liu‐Dang Fang +9 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2018 高血压病是一种威胁人体健康的常见疾病,其主要特征为动脉压升高,是最常见的心血管疾病之一。老年高血压与中青年高血压的临床特点有很大差别,其特点主要表现为以单纯收缩性高血压为主、脉压差大、血压昼夜异常 ...
乔昕, 王炼, 艾攀, 沈文振
doaj
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 6, Page 806-814, June 2026.ABSTRACT Objective To investigate the incidence of pre‐eclampsia (PE) and the predictive performance of the Fetal Medicine Foundation (FMF) first‐trimester PE screening algorithm across pregnancies conceived using assisted reproductive technology (ART), after ovulation induction (OI) and through spontaneous conception (SC).
A. S. L. Kjaer +23 more
wiley +1 more source
, 1991 一、概述随着高压和超高压输电线路的发展,传输电压等级越来越高,容量越来越大,电压质量是关键指标之一。线路的安全运行对国民经济的发展起着突出作用。为了减少重大事故的发生,对电力线路的电压监测和准确判断绝缘于好坏显得十分重要。据此,一种新型的测量110kV 及以下的数字式高电压表,已由中国科学院力学研究所研制成功,并由北京高电精密仪器技术公司投入批量生产。SG 系列数字高电压表是测量直流、交流或交直流两用的高压数字仪表,测量范围0.2kV～110kV,测量精度0.5%～2.5%,能自动变换量程 ...
胡昌信
core +2 more sources
, 2014 本发明公开一种高压自动泄压系统，该系统包括：压力变送器；通过压力变送器与压力容器相连的压力显示仪表；接收压力显示仪表的反馈信号的取反电路；能对取反电路的输出进行强控制的开光电路；接收取反电路信号的驱动电路；输入端接驱动电路，导通后能对压力容器泄压的电（气）动阀门。本发明通过压力容器内的压力变化来控制阀门的开关，起到一旦压力容器超过设定压力，就自动泄压的作用。并且可以用到其他需要高压自动泄压的装置。还具有结构紧凑小巧，费用低廉，安全可靠 ...
唐书凯 +8 more
core
Gaoya dianqi, 2011 回顾总结了国内外的特高压变压器技术现状,介绍了特高压换流变的作用、绝缘结构特点以及换流变的绝缘试验,指出了特高压换流变压器800 kV端绝缘结构耐压水平最高达到1 257 kV以及阀侧套管和出线装置、陡波对绕组纵绝缘的影响和阀侧引出线等绝缘结构薄弱点,为特高压直流换流变的绝缘结构设计制造提供理论依据。
赵鑫 +6 more
doaj
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Additive manufacturing, commonly referred to as three‐dimensional (3D) printing, provides the geometric freedom and multi‐material integration needed to build soft medical robots for minimally invasive interventions, prosthetics, and rehabilitation.
Yao Wang +5 more
wiley +1 more source
Gaoya dianqi, 2016 极母线金属氧化物避雷器是±800 k V特高压直流换流站的关键过电压保护设备之一,其技术研究和产品开发是实现特高压直流设备国产化的一个重要课题。笔者以中国哈密—郑州特高压直流工程为依托,深入研究了±800 k V特高压直流换流站极母线金属氧化物避雷器的关键技术,包括:1大直径直流金属氧化物电阻片技术;2复合外套技术;3多柱电阻片柱并联技术;4悬挂安装技术等。产品通过了全部的型式试验项目,成功地应用于±800 k V哈密—郑州特高压直流工程中,填补了国内特高压直流极母线避雷器领域的空白 ...
胡淑慧
doaj
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 5, Page 613-622, May 2026.ABSTRACT Objectives To evaluate the effect of aspirin on gestational age at delivery due to preterm pre‐eclampsia (PE) in women with chronic hypertension (CH), to assess the predictive performance of the Fetal Medicine Foundation (FMF) first‐trimester competing‐risks model for preterm PE in this high‐risk group and to evaluate how parity, previous PE ...
D. L. Rolnik +23 more
wiley +1 more source
Longitudinal maternal hemodynamics in high‐risk pregnancies with different subtypes of pre‐eclampsia
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 5, Page 623-634, May 2026.ABSTRACT Objective To evaluate maternal cardiac adaptation during pregnancy by comparing longitudinal hemodynamic profiles between women identified as high risk for preterm pre‐eclampsia (PE) who subsequently developed preterm PE, term PE or remained unaffected, as well as low‐risk women.
J. Lin +10 more
wiley +1 more source