Results 11 to 20 of about 13,666 (211)

Nailfold capillaroscopy and deep learning in diabetes 甲襞毛细血管镜检测与深度学习在糖尿病中的应用

open access: yesJournal of Diabetes, Volume 15, Issue 2, Page 145-151, February 2023., 2023
Highlights Nailfold capillary images were obtained by performing nailfold video capillaroscopy in 120 adult patients with and without diabetes. Over 5000 photographs were analyzed using machine‐learning approaches, and these models were clearly able to distinguish people based on diabetes status.
Reema Shah   +6 more
wiley   +1 more source

特高压变压器油箱防爆措施及改进研究 [PDF]

open access: yes, 2023
特高压变压器发生内部故障时如压力不能及时泄放,极易造成油箱变形甚至爆裂,进而导致燃爆事件。分析了变压器常用的防爆保护装置及其优缺点,提出了一种基于爆破片的新型压力泄放装置,并通过真型燃爆试验和动态等效试验对爆破片型压力泄放装置的有效性进行了验证。试验结果表明:在变压器内部高燃爆能量电弧故障下,爆破片型压力泄放装置动作速度和泄放效率均优于压力释放阀 ...
卢理成, 董弘川
core   +1 more source

New Generation High-Performance VSC-HVDC Back-to-Back Technology and Application in Project [PDF]

open access: yes, 2023
[Introduction] Due to the dense load, complex grid structure, and close electrical connections in the Guangdong power grid area, there are three major problems for a long time: the risk of large-scale power outages, the interaction between AC and DC, and
Bo ZHU   +5 more
core   +1 more source

适用于直流配电网故障选线的电力电子变压器分步闭锁方案 [PDF]

open access: yes, 2023
级联H桥型电力电子变压器(power electronic transformer with cascaded H-bridge,CHB-PET)是柔性变电站的重要组成设备之一,在直流配电网中具有重要作用。当CHB-PET低压直流侧发生双极短路故障后,故障电流上升速度快且幅值较高,易导致电力电子器件迅速闭锁,使低压直流电网保护难以准确获取故障信息。针对CHB-PET低压侧多分支直流配电网,提出一种基于PET分步闭锁的故障穿越策略。当检测到PET低压侧直流系统故障后 ...
于弘洋   +5 more
core   +1 more source

Characteristics Analysis and Technical Prospect of Low-Frequency Main Transformer for Offshore Wind Power [PDF]

open access: yes, 2023
[Introduction] Low-frequency alternating current power transmission technology has attracted wide attention. Although its theoretical research continues to go deeper, there are still many problems to be solved before its engineering implementation in ...
Jutian LI   +4 more
core   +1 more source

基于数字孪生的电网变压器故障诊断方法

open access: yes水电科技, 2022
为降低供电安全隐患,保证用户正常供电,提供了采用数字孪生的电网交流变压器故障诊断方案。在该孪生中,通过使用正交全局和局部保持的嵌入算子,将初步事故特点组合变换到高维核空间内,通过计算映射矩阵,得到投射矢量的最佳特性,获取低维敏感特性;同时根据已获取的事件特性,在规则模式中引入概率神经网络算子,构建概率密度函数,并采用差分进化方式,确定初始种群,通过进行多次的变异、交叉操作,丰富群体复杂性,确定最佳的平滑因子,在达到最佳迭代频率时,提供最优化的诊断效果。仿真实验结果表明,所提算法可以合理划分各种事故特点 ...
代友 张
semanticscholar   +1 more source

International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder – Chinese (Mandarin) translation

open access: yesDevelopmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019
目的 本国际临床指南由欧洲残疾儿童学会(the European Academy of Childhood Disability,EACD)牵头制定,旨在解决发育性协调障碍(developmental coordination disorder,DCD)的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题,通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础,以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类,最终转化为指南建议。并由国际 ...
Jing Hua   +6 more
wiley   +1 more source

Research progress in Li-ion battery pack inconsistency control [PDF]

open access: yes, 2017
总结电池均衡、成组方式和热管理的研究方法及问题。电池均衡技术主要有电池均衡电路、电池均衡控制策略;电池成组方式主要有电池串并联方式、电池连接阻抗;电池热管理主要有电池生热特性 ...
冯自平, 吕杰, 宋文吉, 罗卫
core   +1 more source

Design and Implementation of Intelligent Monitoring System for Power Distribution Room [PDF]

open access: yes, 2016
随着我国经济实力的不断增强,电力系统也取得了显著的成就。当前我国电网规模不断扩充。居民对于供电的可靠性与质量要求大幅提高。因此,如何确保提供经济安全、优质可靠的电力是我国电力系统在未来发展中面临的重要挑战之一。配电室作为电力系统中的重要组成元素,担负着电能的变压分流的重任,传统的配电室管理手段主要是依靠人工定时对电力仪表进行检查并形成报表,其工作效率低下,无法适应迅速发展的供电规模与居民的用电需求。如何利用信息技术与网络传输技术对配电室电力设备的运转状态进行远程实时监控,提高配电室管理的信息化水平 ...
姜维伟
core  

Research on Startup of DC Transformer for Electric Vehicle Cluster Grid-Connection [PDF]

open access: yes, 2023
Modular multilevel direct current transformer (MMDCT) provides a feasible solution to realize the efficient and stable integration of electric vehicle charging and discharging cluster into urban DC distribution network.
FAN Weihao   +6 more
core   +1 more source

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