针对预测多种尺度颗粒随机分布复合材料等效热传导参数的难点,提出了一种多尺度有限元方法。
A finite element (fe) method for the prediction of the equivalent heat transfer parameters of the composite material with random multi-scale grains was presented.
结论:传导速度是较敏感的术中监测参数。
Conclusion: Conduction velocity is a sensitive parameter in intraoperative monitoring.
研究了开关电源中印刷电路板寄生参数及功率器件瞬态特性产生的传导电磁干扰现象。
Conducting Electromagnetic Interference (EMI) in switching power supplies caused by parasitic parameters and transient characteristic of power electronic elements is studied in this paper.
介绍了等效传导传热模型的基本方程、界条件和初始条件、性参数的处理以及数值求解方法等。
The artical introduces elementary equation, boundary and initial conditions of model of equivalent conduction heat transfer, physical property prarameters processing and the method of value solving.
合并不同阶的均匀化非傅立叶热传导方程,消去缩小时间尺度参数,得到四阶微分方程。
By combining various orders of homogenized non-Fourier heat conduction equations, the reduced time dependence is eliminated and the fourth-order differential equations are derived.
对模型参数的敏感性分析表明:饱和水力传导度是最敏感的参数,饱和含水量的敏感性次之。
Sensitivity analysis of model parameters showed: Saturated hydraulic conductivity is the most sensitive factor for two soil groups, and saturated water content takes second place.
方法用不同的电刺激参数刺激坐骨神经干,测定引起的动作电位的幅度和传导速度分别衰减20%以及潜伏期延长20%时所需的时间。
The time required was investigated for the action potential to reduce its conduction velocity by 20% and to extend the latent period by 20% respectively.
并以此研究了混合颗粒系统中的热传导,研究发现此混合系统的有效热导率将随着固体体积百分比,系统结构特征参数和分形维数的变化而变化。
Furthermore, we investigated the thermal conductivity in the mixed system. Found that the thermal conductivity changed with the solid fraction, structural character parameter and fractal dimension.
此外,还讨论了应用这种等参数单元求解热传导温度场分布的方法。
In addition, the article also discusses the usage of isoparametric element for solving temperature distribution in heat conduction.
但事实上,这种方法是不妥当的,其错误主要来自于下述假定:对热传导方程的一级修正对物理学的所有参数都成立。
In fact, this method is improper. The mistake results mainly from the following hypothesis: the first order correction of the heat conduction equation is tenable for all parameters in physics.
F波各参数总异常率与尺神经运动传导各参数总异常率无统计学差异。
There were no significant difference in the overall abnormal rate between F wave and the ulnar nerve motor conduction.
测定两组病人治疗前后血压、血糖、血脂、血液流变学参数和胫、腓神经运动传导速度,观察溃疡愈合时间。
Fasting plasma glucose (FPG), lipid, haemorheological parameters, tibial and peroneal nerve motorial conduction velocity (T-PNMCV), the ulcer healing time were observed.
测定两组病人治疗前后血压、血糖、血脂、血液流变学参数和胫、腓神经运动传导速度,观察溃疡愈合时间。
Fasting plasma glucose (FPG), lipid, haemorheological parameters, tibial and peroneal nerve motorial conduction velocity (T-PNMCV), the ulcer healing time were observed.
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