1) Critical friction temperature
临界摩擦温度
2) threshold friction velocity
临界摩擦速度
1.
The threshold friction velocity of oasis surface is greater than that of Gobi surface at natural condition, and the vertical dust flux of oasis surface is nearly 10 times smaller than that of Gobi surface because of the difference of the land-surface characteristics such as particle size distribution, plant vegetation and surface soil moisture content and so on, but whe.
研究表明,在自然状态下,由于地表土壤的粒子尺度分布特征、植被覆盖度及地表土壤水分含量等下垫面特征不同,绿洲地表风蚀起沙的临界摩擦速度要大于戈壁地表,其垂直尘粒通量(风蚀起沙率)比戈壁地表小将近一个数量级;但考虑人为的翻耕作用时,绿洲地表风蚀起沙的临界摩擦速度可能会减小一半以上,其垂直尘粒通量也将增加大约一个数量级,甚至比戈壁地表还要大。
2.
The dust particle concentration data measured by Wide Range Particle Spectrometer and the data observed at a 20 m meteorological tower were used to calculate the dust emission rate,friction velocity and threshold friction velocity over Zhurihe area,Inner Mongolia.
通过宽范围颗粒谱仪WPS以及20 m梯度塔获得的观测资料,计算了朱日和地区沙尘天气下的起沙通量、摩擦速度以及临界摩擦速度,得到以下结论:①起沙通量大小与沙尘天气的强度呈一定的相关关系,随着沙尘天气强度的增大,起沙通量大小也增大。
3) critical density of dynamic frication
动摩擦临界浓度
4) critical friction angle
临界摩擦角
5) frictional temperature
摩擦温度
1.
Based on Galerkin variation principle,an elastic finite element analysis model of coupling friction heat for wheel/rail was put forward,and the relations between wheel/rail friction heat and rail expanded displacement in touched area,wheel/rail frictional temperature,contact strain and stress.
基于伽辽金变分原理,利用有限元方法,建立了轮轨摩擦耦合热弹性有限元分析模型,分析了轮轨摩擦热与钢轨接触区热膨胀位移、摩擦温度、应变和应力的关系。
6) friction temperature
摩擦温度
1.
To deal with the problem that thermal flow density varies with time on absolutely sliding lining surface, this paper proposes on approximate method of calculating friction temperature in multi rope friction winder lining according to the integrate method of solution to thermal conduction problem.
针对绝对滑动衬垫表面热流密度随时间变化的情况，依照求解热传导问题的积分法提出了计算多绳摩擦提升机衬垫摩擦温度的近似方法，并对其应用进行了分析和讨论。
补充资料：BCS临界温度`T_c`公式（formulaofBCScriticaltemperature$T_c$）
BCS临界温度`T_c`公式（formulaofBCScriticaltemperature$T_c$）
简称BCSTc公式。在弱耦合条件下所给Tc公式为：
`k_BT_c=(1.14)\hbar\omega_Dexp(-1//N(0)V)`
由此知Tc∝ωD，ωD为德拜频率。但$\omega_D\proptoM^{-1/2}$，M为同位素原子质量。实验指出，Tc∝M-α，对一般元素α=1/2。故上式给出了超导的同位素效应。实验结果又显示，当N(0)V≤0.2时，BCS理论结果与实验的符合很好；0.20＜N(0)V＜0.3时有1的误差；N(0)V＞0.3时则误差增大较迅速。这里N(0)和V分别是T=0K时费米面上一种自旋取向的态密度和电子间净的有效吸引相互作用势强度。所以Tc受弱耦合($N(0)V\lt\lt1$)的限制，其最高Tc也受到限制，不能接近ωD的最高值所对应的Tc。BCS理论机制估计的最高Tc一般约30K左右，对金属氢估计可达252K。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条