Results 51 to 60 of about 1,318 (101)

动态条件下飞机机翼雷击特征研究

Dianci bileiqi
:雷击作为自然状态下的长间隙放电现象，对飞行器的安全构成直接威胁。考虑到飞机在空中面临复杂情况且遭遇雷击的概率较地面物体大，有必要对其雷击特性进行深入分析。本研究通过关注速度和迎角两个关键变量，利用先导发展模型对飞机机翼的动态雷击特性进行了分析。研究结果表明，机翼高低压区的气压差随着迎角的增加而增大，在15°时达到极值后呈减小趋势，导致机翼高低压区的上行先导触发高度差异达到了33.63%；而当速度为120 m/s时，低压区的触发高度仅为高压区的54.7%（分别为435 m和795 m）。研究结果表明 ...
杨宁, 张书琴, 刘颖, 金晨路, 侯文豪   +4 more
doaj  

[A prospective cohort study of gut microbiota changes in very preterm infants with bronchopulmonary dysplasia]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Huang J, Lai JD, Lin XZ, Zheng Z, Wang YS.   +4 more
europepmc   +1 more source

[Conversion therapy for hepatoid adenocarcinoma of the stomach: A case report]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Li J, Chen L, Tang J, Wu Y, Wang A.
europepmc   +1 more source

[Dynamic changes in gut microbiota from 1 to 12 months of age in preterm infants]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Song QY, Zhao XL, Ding BL, Lyu Q, Ma LY.
europepmc   +1 more source

[Clinical and molecular characteristics of neonatal <i>Klebsiella</i><i>pneumoniae</i> sepsis]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Hebei Provincial Neonatal Sepsis Research Collaboration Group.
europepmc   +1 more source

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

Beijing Da Xue Xue Bao Yi Xue Ban
Zhao J, Fu C, Zhao X, Xue H, Li S, Wang Z, Zhu F.   +6 more
europepmc   +1 more source

[Comparative analysis of microbial communities in different oral ecological niches of preschool children]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Liu J, Sun Y, Wu J, Tang S, Ding G.
europepmc   +1 more source

[Pathogen Profile and Risk Factors for Hospital-Acquired Infection in Stroke Patients]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Xu T, Han B, Zhang H, Shao C, Wang Y, Jiao Y, Zhang G.   +6 more
europepmc   +1 more source

[Research Progress on Microbiome-Driven Mechanisms and Intervention Strategies for Oral Malodor]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Shang X, Wang Z, Ge S.
europepmc   +1 more source

[Clinical characteristics, efficacy and safety of antifibrotic agents in elderly patients with connective tissue disease-associated interstitial lung disease]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Lan J, Chen Z, Cheng Y, Zhao L.
europepmc   +1 more source