Results 71 to 80 of about 13,690 (118)

[Risk factors for ventilator-associated pneumonia in patients with chest trauma in intensive care unit]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Zhao J   +6 more
europepmc   +1 more source

[Expert consensus on perioperative management of tooth extraction in patients receiving denosumab therapy]. [PDF]

open access: yesHua Xi Kou Qiang Yi Xue Za Zhi
Ye L   +27 more
europepmc   +1 more source

百米级尺寸风机叶片雷电下行先导接闪特性的仿真研究

open access: yesDianci bileiqi
针对百米级长度风力发电机叶片雷击接闪特性不明晰、防护设计缺乏依据的问题,本研究建立了大容量风机叶片雷击接闪过程的三维仿真模型,模型计算结果与运行数据吻合。计算获得了6.7MW风机叶片沿长度方向不同位置的雷击暴露空间和年雷击次数的分布特征,结果表明随着雷电流幅值增加,叶尖的引雷能力增强并对叶片内侧存在屏蔽作用,自叶尖往叶根方向年雷击次数迅速衰减。当风机叶片与纵轴线夹角为90°时,叶片内侧遭受雷击的风险最高。与1.5MW机组相比,6.7MW风机叶片内侧年雷击次数增加1.71倍。分析表明,雷电流幅值为5.0 ...
秦明   +7 more
doaj  

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