Gaoya dianqi因交流滤波器避雷器在使用中频繁动作，其核心部件ZnO电阻片通过多次冲击电流时呈现老化现象，而ZnO电阻片的交直流参考电压、泄漏电流的变化与冲击电流幅值、冲击电流波形、冲击次数以及间隔时间等密切相关。因此文中对比分析了ZnO电阻片在8/20μs雷电冲击电流2次一组和20次一组作用下交直流伏安特性的变化规律。试验结果表明：无论是直流伏安特性还是交流伏安特性，2次一组冲击相较于20次一组冲击对ZnO电阻片的老化性能影响更明显。此外，当直流参考电压U1mA下降5%时，0.75U1mA下泄漏电流IL远小于50 ...
孙泉 +4 more
doaj
[Analysis of disease burden and changing trends of traumatic brain injury in China, 1990-2023]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiHan Y, Sun K, Pan W, Luo X.
europepmc +1 more source
[Trends in burden of pelvic fractures from 1990 to 2023 and long short-term memory-based insights into future projections]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiFan W +7 more
europepmc +1 more source
[Attributable disease burden of low bone mineral density related fractures in people over 50 years old from 1990 to 2023 in China]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiLai Z +5 more
europepmc +1 more source
[Construction and Clinical Validation of a Risk Early Warning Model for Mechanical Ventilation-Associated Pneumonia in Older Patients With Lung Cancer]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanWang Z +6 more
europepmc +1 more source
Gaoya dianqi交联聚乙烯（XLPE）电力电缆广泛应用于配电网和输电网，但它们在持续的电应力下遭受长期的老化退化，电缆老化容易造成绝缘击穿事故。为了提升电缆绝缘老化状态的在线评估技术，基于PSCAD建立了计及电缆绝缘不均匀老化的三芯管型电缆接地电流相位角计算模型，通过快速傅里叶变换FFT变化得到单相不均匀老化、双相不均匀老化、三相均匀老化3类情况的接电线电流相位角特性。结果表明：相比于钢铠接地线电流，屏蔽线电流相角对于老化特性的反应更为灵敏；对于单相老化，介电常数由2增加为5，屏蔽线电流相位角从-51.01°递增为 ...
刘刚 +5 more
doaj
[Managing refractory wounds in the elderly with the concept of chronic critical illness]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za ZhiGuo GH, Huang SY, Zhu F.
europepmc +1 more source
Gaoya dianqi高温硫化（HTV）硅橡胶复合绝缘子作为架空输电线路的重要组成部分，其在长时间的户外运行中出现的异常发热状态会加剧伞裙的老化，严重时会威胁到输电线路的安全运行。通过对HTV硅橡胶复合绝缘伞裙样品进行480 h的人工热空气老化试验，对样品进行邵氏硬度、水接触角、红外光谱、微观形貌及沿面闪络电压等多项性能参数的测量，分析伞裙样品的热老化特性。研究结果表明，长时间的热老化作用，会加剧伞裙的硬化，降低材料的憎水性。随着热老化时间增加，伞裙样品的老化程度增加，沿面闪络电压先增加后减小。
程洋 +5 more
doaj
["Chongqing experiences" in treatment of bone infections]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiXie Z.
europepmc +1 more source
[Analysis of setup errors and their correlation with clinical factors in image-guided radiotherapy for prostate cancer using different immobilization devices]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoGuo X +5 more
europepmc +1 more source