Results 31 to 40 of about 7,633 (169)
Research on Redundant Flight Control System of Unmanned Aerial Vehicle [PDF]
, 2017 飞行控制系统的高可靠性是无人机安全飞行的重要保证。为提高无人机飞行控制系统的可靠性，本文设计了无人机余度飞控系统架构，在此基础上深入研究了余度飞控系统中的总线通信设计、余度飞控计算机软件设计和机载传感器冗余设计。 首先，本文借鉴典型航电架构方案，设计余度飞行控制系统的架构，并对其进行简要的静态可靠性分析。根据系统架构设计方案，制定余度飞控计算机软件和机载传感器冗余的总体设计方案。 其次，本文比较多种航空和工业总线，选出FlexRay总线作为余度飞行控制系统的通信总线 ...
包国宁
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Novel opportunistic cooperative multicast scheme for NOMA [PDF]
, 2020 The cognitive radio technology was applied to non-orthogonal multiple access (NOMA) cooperative multicast system,the feasibility of using users as relays was studied,and a two-level cooperative transmission scheme with parameterized multicast candidate ...
Haowei BIAN +3 more
core +1 more source
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
BMS for Power Lithium-ion Batteries Based on Variable Rate Equalization Charging Technology [PDF]
, 2015 能源短缺和环境污染是当今世界所面临的两大难题。如今，节能和环保已成为世界汽车工业发展的主题，因此开展新能源汽车的研究刻不容缓。电动汽车以具有零排放，低噪音等优点，越来越受到世界各国的关注。电动汽车的动力源于动力电池组，电池组的整体性能和使用寿命关系到电动汽车的性能，作为电动汽车发展的关键技术之一的电池管理系统(BMS)，是电动汽车产业的研究重点。 动力电池组的不一致性会导致电池组性能大幅下降，因此，通过研究降低动力电池组不一致性的方法来提高电池组使用效率和使用寿命具有重要意义 ...
梁恺
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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
, 2018 在工程结构的可靠性优化过程中,求解的效率和精度是优化方法的关键。该文提出一种针对解耦优化的融合策略。所提方法在优化迭代解耦所用的失效概率函数为前几次迭代设计点构建的局部失效概率函数的加权融合形式。在对原可靠性优化问题进行解耦后,结合序列近似优化方法进行迭代求解。相比于常规的仅使用当次局部建立的失效概率函数而言,所提融合策略最大限度利用了各次迭代中产生的信息用于优化解耦求解,能够提高失效概率函数的近似精度,从而间接达到减少迭代次数和计算量的目的。最后给出了屋架和十杆结构的可靠性优化算例 ...
张保强, 朱海燕, 袁修开
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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
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
The Research about Chinese Language Teaching Based on Language Learning Behaviors [PDF]
, 2016 近年来，课堂教学逐渐开始从传统的“以教师为中心”转向为“以学生为中心”的教学。汉语教学中，即使在同一个班级、环境、教师教学下学习，学习者的学习效率则不同。这差异的存在对学习者汉语学习水平产生了极大的影响。许多研究表明，学习者的学习还取决于学习者本人的学习行为，并强调学习者良好学习行为习惯培养的重要性。 本研究以语言学习行为为一个深入点来分析汉语教学情况，对学习者在汉语学习过程中表现出的学习行为进行探讨研究，并基于学习者的语言学习行为提出以学习者为主体的汉语教学建议 ...
ANGELY SETIAWAN(薛亦雯)
core
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