Results 81 to 90 of about 990 (150)

一个简单的识别钢丝绳减振器性能的方法

, 1991
本文提出一个通过稳态正弦激励直接识别钢丝绳减振器滞回性能的方法。实验结果表明,在激振频率由0～30Hz范围内,滞回性能基本上与频率无关。基于这一结论,通过对实验数据曲线的拟合,得到了一个描述力-位移滞回曲线的简洁多项式数学模型,这个模型在用于分析非线性滞回系统时是很方便的。本文还提出了另一个简单的识别方法。当对减振器进行稳态简谐激励时,对响应讯号进行F.F.T分析,便可识别其模型。实验结果表明,这个方法既有足够的精度 ...
倪一清, 田千里, 高赞明
core  

[Analysis of risk factors for early death in hyperleukocytic acute leukemia]. [PDF]

Zhonghua Xue Ye Xue Za Zhi
Su MH, Yan ZS, Li QL, Zhang JY, Yin YK, Hu B, Liu YZ, Li DP, Mi YC.   +8 more
europepmc   +1 more source

[High serum cystatin C is an independent risk factor for poor renal prognosis in IgA nephropathy]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Tang T, Li L, Chen Y, Zhang L, Xu L, Li Z, Feng Z, Zhang H, Hua R, Ye Z, Liang X, Li R.   +11 more
europepmc   +1 more source

高层建筑混合连肢墙体系的抗震性能

, 2009
首先介绍了混合连肢墙体系的产生背景和特点,然后给出了该体系在整体结构和节点性能等方面的研究现状。在总结已有研究成果的基础上,指出了目前研究存在的不足和需要进一步解决的问题,并提出了一种新型钢梁柱焊接连接形式的混合连肢墙体系—含型钢边缘构件的混合连肢墙体系,具有构造简单、施工方便的特点。初步研究结果表明,该种新型连接形式滞回曲线饱满,强度和刚度退化缓慢,具有优良的抗震性能,是混合连肢墙体系值得研究的一个方面 ...
苏明周, 郭峰
core  

T形PEC柱抗震性能的数值模拟分析

利用ABAQUS软件对14个T形PEC柱进行低周反复加载模拟，分析不同参数对T形PEC柱抗震性能的影响规律。结果表明：T形PEC柱的滞回曲线呈饱满的平行四边形，且刚度退化稳定，耗能能力和延性良好；提高混凝土强度等级虽然可增大柱的初始刚度，但混凝土强度等级过高则会导致柱的延性降低，刚度退化加剧，抗震性能降低；在T形PEC柱内设置横向拉杆，且将x方向和z方向的横向拉杆相互焊接，有利于对混凝土形成套箍作用从而提高柱的抗震性能，但拉杆间距不宜大于150 mm ...
刘谋雷, 李媛萍
core   +1 more source

[Construction of a predictive model for postoperative pain relief after microscopic spermatic cord surgery for spermatic cord pain]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
He H, Li Q, Xu T, Zhang X.
europepmc   +1 more source

[Calcification distributional density of the aortic-valvular complex is an independent risk factor for conduction block following self-expanding transcatheter aortic valve replacement]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao, 2023
Wang W, Sun Z, Xin R, Ding Y, Liu Z, Wang X, Wang J, Shan D, Liu C.   +8 more
europepmc   +1 more source

[Analysis of four brominated flame retardants in mineral water and instant-noodle-bowl samples by magnetic solid-phase extraction coupled with liquid chromatography using magnetic carbon aerogel as adsorbent]. [PDF]

Se Pu
Nie QR, Ni M, Xu JY, Shi Y, Jiang HM.
europepmc   +1 more source

[Analysis of Risk Factors for Meningeal Metastasis in Patients 
with Lung Adenocarcinoma Following Non-surgical Interventions]. [PDF]

Zhongguo Fei Ai Za Zhi
Yue Y, Ren Y, Lin J, Lu C, Jiang N, Su Y, Li J, Wang Y, Wang S, Fu J, Kong M, Zhang G.   +11 more
europepmc   +1 more source

[A cardiac magnetic resonance-based risk prediction model for left ventricular adverse remodeling following percutaneous coronary intervention for acute ST-segment elevation myocardial infarction: a multi-center prospective study]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Ma Z, A X, Zhao L, Zhang H, Liu K, Zhao Y, Qian G.   +6 more
europepmc   +1 more source