Results 101 to 110 of about 1,065 (154)

高压开关传动系统关键零件的疲劳强度分析与寿命估算

Gaoya dianqi, 2013
零件疲劳分析与计算对高压开关设备寿命预测起着至关重要的作用。笔者分析了高压开关传动系统关键零件疲劳的特点;建立了零件疲劳极限应力图模型,采用该模型可以计算出零件的疲劳极限与疲劳安全系数,并且可以估算在考虑安全系数前提下零件的疲劳寿命;以某高压断路器传动连杆的疲劳计算为例,对所采用的方法进行了验证。得出了3点结论:①有必要对高压开关零件进行疲劳分析和计算;②借助零件疲劳极限应力图可以较好地进行零件疲劳强度计算;③应力集中和零件材质对疲劳极限和寿命有较大的影响。
程立, 朱琦琦, 吕军玲, 徐刚, 马冲   +4 more
doaj  

[Analysis of the disease burden of Burkitt lymphoma in China from 1990 to 2021]. [PDF]

Zhonghua Xue Ye Xue Za Zhi
Zheng CH, Wang Y, Chen J, Guo JD, Qi JL, Zhou MG, Song YQ, Zhu J, Liu WP.   +8 more
europepmc   +1 more source

[Analysis of disease burden, attributable risk factors of low back pain in China from 1990 to 2023 and prediction for 2030]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Wei J, Chai R, Luo B, Wang G, Yang T, Wang X, Yan Y, Yan M, Ye Z, Huang J, Gao B, Luo Z.   +11 more
europepmc   +1 more source

振动作用下换流变阀侧套管法兰应力分布对其疲劳寿命的影响

Gaoya dianqi
在换流变压器长期振动载荷下，其阀侧套管金属法兰容易因应力集中而出现疲劳开裂，但如今针对套管法兰应力和疲劳寿命的研究还相对匮乏。文中参考实际套管建立阀侧套管模型，采用有限元仿真方法得到不同振动载荷和套管结构下法兰应力和振动疲劳寿命。研究发现：在不同振动方向下，由于交变应力和静态应力的共同影响，套管法兰在x向振动下疲劳寿命最小，在z向下最大；在不同振动频率或幅值下，法兰疲劳寿命随着交变应力的增大而减小，而危险点处静态应力几乎不变。改变套管结构，发现主要是通过减小静态应力来增大法兰寿命 ...
颜锐奇, 张晋寅, 韦晓星, 王仲
doaj  

[β-sitosterol, an important component in the fruits of <i>Alpinia oxyphylla</i> Miq., prolongs lifespan of <i>Caenorhabditis elegans</i> by suppressing the ferroptosis pathway]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Li J, Chen S, Xie L, Wang J, Cheng A, Zhang S, Lin J, Fang Z, Pan Y, Cui C, Chen G, Zhang C, Li L.   +12 more
europepmc   +1 more source

[Trends in burden of osteoporosis in China from 1990 to 2023 and analysis of epidemiological factors]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Wu Y, Lai Z, Yan H, Zhou B, Chen W, Zeng Z.   +5 more
europepmc   +1 more source

[Analysis and prediction of the disease burden of attention-deficit/hyperactivity disorder in Chinese children and adolescents from 1990 to 2021]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Jia R, Han F.
europepmc   +1 more source

[Research progress and optimization strategies for early screening of type 1 diabetes]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Song QJ, Sun Y.
europepmc   +1 more source

[A study of burden of gout disease in adults attributable to high body mass index and impaired kidney function in China from 1990 to 2023]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Liu Q, Hu L, Hu Y, Xiong Q, Li J, Yang C, Fu W.   +6 more
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 Zhi
Fan W, Yin Y, Tian C, Zhou J, Xie T, Shi L, Liu G, Rui Y.   +7 more
europepmc   +1 more source