Results 11 to 20 of about 79,706 (154)
中西医结合护理, 2021 Allergic purpura, as an allergic microvascular allergic disease, mostly occurs in children. Clinical manifestations include skin purpura, joint pain, abdominal pain and kidney damage.
HU Yuan (胡园) +2 more
doaj +1 more source
中西医结合护理, 2021 Objective To investigate the influencing factors of postpartum urinary retention in women with natural childbirth and related nursing interventions. Methods The clinical data of 115 women with natural childbirth were retrospectively analyzed, in which ...
XIANG Jie (向洁), MO Tao (莫桃)
doaj +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 为了研究初始几何缺陷对跨层平面桁架稳定承载力的影响，以某车站正立面跨层平面桁架为例，在1∶10的缩尺模型静力试验的基础上，结合有限元模型，考察了不同幅值的整体缺陷与构件缺陷对结构稳定承载力的影响。对比了一致缺陷模态法和静力失稳模态法这两种整体缺陷分布方法对结构稳定承载力的影响。研究表明：达到承载力极限前，桁架平面外位移量较少，未发生平面外失稳，在规范允许的偏差范围内，缺陷对结构的承载力影响几乎可以忽略；跨层平面桁架结构稳定承载力对初始几何缺陷的敏感性较弱，但其平面内及平面外位移对几何缺陷较敏感 ...
赵雷 +4 more
doaj
基于ARMA和Copula理论的多因素GIS设备家族性缺陷故障预警
Gaoya dianqi, 2022 针对传统电网设备缺陷的监视和设备家族性缺陷的风险发布都是事后的被动处理,以及考虑到电力设备家族性缺陷往往不是单个因素引起的,为了实现电网设备家族性缺陷故障主动预警,首先,文章建立了家族性缺陷故障数据库,包括设备缺陷影响因素数据及其缺陷决策数据;其次,采用ARMA模型预测单个影响因素在未来时刻的值,通过Copula函数建立单个影响因素与缺陷决策数据之间的概率预测模型;最后,上述不同因素的概率集成就是家族性缺陷故障发生的预测概率。基于上述研究内容,提出了一种面向电网设备家族性缺陷短时预警的统计机器学习方法。
邓祥力, 张乾波
doaj
Gaoya dianqi, 2023 高压开关柜作为电力系统的重要组成设备，其绝缘缺陷导致的设备故障会降低电网运行的安全性。局部放电检测在开关柜局部放电领域尚未行成统一的评判体系，为了提高开关柜绝缘缺陷的诊断水平，文中对多种局部放电测量方法进行灵敏性及有效性研究，明确了检测方法对于缺陷类型的适用性。文中设计并制作4种典型局部放电缺陷，搭建包含脉冲电流法，特高频法，超声法和暂态地电压法的局部放电多方法测量系统，在不同电压等级下测量局部放电信号并进行汇总。结果表明，在开关柜内，暂态地电压法和特高频法适用于所有类型缺陷的测量 ...
周彦 +5 more
doaj
Gaoya dianqi, 2020 文中采用实际运行中的电缆,制作了3种典型模型缺陷,利用脉冲电流法研究不同外施电压下3种典型缺陷的局部放电特性,根据不同外施电压下典型缺陷的局部放电相位分布图谱,提取3个局部放电特征量并绘制趋势图。结果表明,在依据文中缺陷制作方法和试验过程的条件下,断口缺陷的起始放电电压最低,放电图谱具有明显的不对称性;气隙缺陷起始放电电压最高,其放电随着外施电压的升高逐渐转移到1、3象限;尖刺缺陷负半周放电呈"Г"型。3种缺陷的特征量随外施电压升高存在不同的变化趋势,其中尖刺缺陷局部放电相位宽度最大 ...
杜浩 +6 more
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao +2 more
wiley +1 more source
Leveraging an Unhappiness Lens for Smarter Policies
Policy Studies Journal, EarlyView.ABSTRACT Traditional policy research has largely focused on enhancing happiness or well‐being, privileging positive outcomes as the primary metric of success. We argue that a systematic focus on the drivers of unhappiness—rather than solely on happiness—offers a complementary analytical framework that can uncover hidden societal deficits and broaden ...
Marine Coupaud +2 more
wiley +1 more source
Measuring Governance or Wealth? Construct Validation of AI Readiness Indices
Policy &Internet, Volume 18, Issue 3, September 2026.ABSTRACT Many are the promises of artificial intelligence and the indices claiming to measure government readiness for it. This study provides the first construct validity investigation of the Oxford Insights Government AI Readiness Index, the Tortoise Global AI Index, and the IMF AI Preparedness Index, using a nine‐test battery and drawing on ...
Anis Ben Brik
wiley +1 more source
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Electrosynthesis of hydrogen peroxide (H2O2) via the two‐electron oxygen reduction reaction (2e−ORR) offers a sustainable and decentralized alternative to the anthraquinone process. However, conventional solo‐active‐site catalysts are intrinsically limited by scaling relationships, imposing a trade‐off between activity and selectivity.
Yiqi Ding +12 more
wiley +1 more source