Results 21 to 30 of about 7,935 (119)
Review of additively manufactured zinc alloys by laser powder bed fusion for biomedical applications
Rare Metals, Volume 44, Issue 11, Page 8262-8291, November 2025.Graphical abstract AbstractZinc (Zn) and its alloys have emerged as promising candidates for biomedical materials, owing to their controlled degradation kinetics, intrinsic biocompatibility, and the release Zn2+ ions which are known to promote bone regeneration and tissue healing.
Xuan Yang +5 more
wiley +1 more source
Exploring gaps, biases, and research priorities in the evidence for reptile conservation actions
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract With over 21% of reptile species threatened with extinction, there is an urgent need to ensure conservation actions to protect and restore populations are informed by relevant, reliable evidence. We examined the geographic and taxonomic distribution of 707 studies that tested the effects of actions to conserve reptiles synthesized in ...
Oliver Speight +9 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 3, Page 290-297, September 2025.ABSTRACT Objective The purpose of this cost‐utility analysis was to model the clinical and economic impact of three cervical‐length screening strategies among low‐risk twin pregnancies: two‐step universal screening (at 18–20 and 20–22 weeks), one‐step universal screening (at 18–20 weeks) and no screening.
Y. Khaikin +4 more
wiley +1 more source
Zhendong Ceshi yu Zhenduan为了分析高超声速飞行器的可靠性，将高超声速飞行器纵向模型等效为悬臂梁结构，并为其建立了极限状态函数。针对极限状态函数中变量参数的不确定性，提出了一种基于两阶段Kriging模型的混合可靠性分析方法。首先，第1阶段以满足一定精度的可能失效点为采样中心，选取初始样本点构建初始Kriging模型，使模型满足一定的精度；其次，第2阶段基于一次可靠度方法和初始Kriging模型对飞行器进行混合可靠性分析，该阶段结合学习函数对Kriging模型进行自适应更新，提高了可靠性计算的效率和精度；最后，在极限强度 ...
doaj +1 more source
Jixie chuandong, 2000 根据模糊分析和运用可靠性设计的基本理论 ,结合最优化设计技术 ,提出了渐开线少齿差行星传动的模糊可靠性优化设计方法 ;在考虑了全部变量的随机性和离散性约束条件中含有模糊关系和模糊可靠度要求的情况 ,以体积最小为目标建立了行星传动的模糊可靠性优化设计数学模型 ,并给出了优化方法和结果分析。
王剑彬
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Understanding Self‐Rated Health: Examining the Mediating Effect of Self‐Efficacy
World Medical &Health Policy, Volume 17, Issue 3, Page 589-605, September 2025.ABSTRACT Understanding self‐rated health (i.e., individuals' perception of their health status) is essential because it not only serves as a reliable and valid indicator of population and individual health, but also provides an important basis to formulate health policies and to evaluate the effectiveness of these policies (Salomon et al., 2009 ...
Ho Man Leung +2 more
wiley +1 more source
Gaoya dianqi, 2013 高压SF6断路器是电网中的重要元件,它对电网运行的可靠性有着重要影响。笔者以高压SF6断路器为分析目标,讨论了高压SF6断路器可靠性研究的目的,并论述了可靠性研究的发展现状。结合高压SF6断路器的技术特点,讨论了高压SF6断路器进行可靠性研究的特点;针对高压SF6断路器的开合、绝缘、载流、静态结构、机构及传动、辅助和控制回路等6个功能模块,分析了对其进行可靠性研究的难点;最后,总结了对高压SF6断路器密封元件进行可靠性评估的可能手段和方法。
魏泉 +6 more
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Gaoya dianqi, 2020 作为电力系统终端设备之一,断路器起着控制、调节和保护作用,其可靠性水平对电力系统的稳定产生重要的影响。断路器可靠性研究的重点在于机械可靠性。针对真空断路器的机械可靠性研究问题,为了更充分地利用断路器失效的过程信息,文中采用基于退化的可靠性建模方法,对6台12 kV永磁机构真空断路器做了数万次退化试验,采用主成分分析法确定了超程为退化量来建立退化过程模型。根据超程退化数据,分别采用正态分布和Weibull分布建立退化分布模型,计算得到了相应的模型参数,并给出了可靠度函数和可靠度对比曲线。
穆艳, 王永兴, 邹积岩
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External validation of QUiPP App in three independent European cohorts of symptomatic women
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 2, Page 163-174, August 2025.ABSTRACT Objective To validate externally the QUantitative Innovation in Predicting Preterm birth (QUiPP) App v.2 for the prediction of spontaneous preterm birth (sPTB) in symptomatic women attending tertiary care in Europe. Methods The QUiPP App v.2 was validated in three independent datasets: a prospective European multicenter cohort across five ...
A. M. Fischer +8 more
wiley +1 more source
Gaoya dianqi, 1983 可靠性工程已经逐步发展成为一门独立科学,广泛地使用于各工业部门,作为提高产品设计和运行质量的技术指标之一。过去,可靠性只是定性分析,现在已经可以定量地进行估计。我国七十年代中期在电力系统中开始应用可靠性工程,近几年在机械工业中也着手进行研完了,在高压电器工业中进行可靠性的估计分析十分必要。“故障模型和效应分析技术”一文介绍了欧美、日本的FMEA的一些基本概念和表格形式等,阐述了了可靠性工程的一些基本知识。显然,FMEA要在我国真正使用,还得进行大量基础工作和研究一些计算及统计方法,特别是对故障发生的概率,
陆首群
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