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平均动量
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  mean momentum
     A statistical model for the electrical resistivity of ideal metals is proposed that the elec-trical resistivity of a ideal metal is directly proportional to the phonon concentration and the square ofthe phOnon mean momentum. The temperature dependence obtained from the theoretical formula arecoincident with the experimental facts that the electrical resistivity is directly proportionaI to tempera-ture T at high temperature and to T~5 at low temperature.
     本文提出了纯金属电阻率与声子浓度及声子平均动量的平方成正比的统计模型,由此简化模型.给出了纯金属电阻串的一个解析表达式,理论与实验规律相符,即在高温时,电阻率与温度T成正比,低温时与T ̄5成正比.
短句来源
     The conclusion from the statistical model that the electrical resistity of ideal metals is directly proportional to the phonon concentration and the square of the phonon mean momentum has been obtained.
     由统计模型可得出:纯金属电阻率与声子浓度及声子平均动量的平方成正比。
短句来源
     With the data obeerved on the surface of Rikeze and Naqu in Tibet from July of 1993 to April of 1994,the surface roughness,the mean drag coefficient,the mean momentum flux,the mean sensible heat flux and the mean turbulent coefficient are calculated in the surface similarity theory. Their relations with the stability are discussed and the samples of their daily variation are given.
     利用西藏日喀则、那曲1993年7月至1994年4月近地面层梯度观测资料,采用近地面层相似理论方法,计算了观测期间地面粗糙度、平均曳力系数、平均动量通量、平均感热通量和平均湍流系数,讨论了它们与稳定度的关系,给出了日变化个例。
短句来源
     New Reynolds mean momentum equations including turbulent viscosity and dispersion are used to analyze the vertical profile of wind speed in the surface layer. It is demonstrated that the wind profile of the surface layer including turbulent dispersion has a logarithmic modification on the classical power law.
     应用包括湍流粘性和频散的新的Reynolds平均动量方程,分析了边界层的垂直风速廓线,发现包含湍流频散的地面层的风速廓线对经典的风廓线指数规律有一个对数规律的修改;
短句来源
     This article deduces molecular beam's momentum distribution function,calculates mean momentum,root mean square momentum and furthorest possible momentum,and compares them with the characteristic physics quantities corresponding to molecular beam's speed distribution function one by one.
     本文首先推导出分子束的动量分布函数 ,然后计算了平均动量、均方根动量和最概然动量 ,并与分子束的速率分布函数相应的特征物理量逐一比较
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  “平均动量”译为未确定词的双语例句
     On the neutral condition the bulk momentum and sensible heat transfer coefficients at the height of 10 m are respectively equal to 4.83×10~(-3)and 3.81×10~(-3) , and the ratio between them is 1.27.The bulk transfer coefficients change during a day, reach the maximum at noon and the minimum at night.
     在中性条件下,10m高处平均动量总体输送系数和感热总体输送系数分别为4.83×10-3和3.81×10-3,比值是1.27。
短句来源
     The actual reaction cross section for the Drell-Yan process should be the common Drell-Yan cross section multiplied by this K factor so as to account for the main corrections due to Annihilation diagrams and Compton diagrams. Using the perturbation QCD, Double ^-rescaling model, generalized x-rescaling model we analyze the K factor's nonconstancy problem for A-A collision.
     通过选取不同入射核子的平均动量分数x_1值,在高能核—核碰撞Drell-Yan过程考虑湮没项和康普顿散射项的基础上,利用微扰QCD及双重Q~2重标度模型、推广的x重标度模型,分析了核—核碰撞下K因子的常数性问题。
短句来源
     It is found that for the given momentum fraction x\ carried by the quark(anti-quark) or gluon within the bound nucleon the K factor's value is dependent upon the changing momentum fraction KI carried by the parton participating in annihilating into y ;
     我们发现,对于来自束缚核子的夸克(反夸克)或胶子所携带不同的x1_值,K因子随参与湮没成γ~*的部分子所携带束缚核子平均动量分数x_2的变化很不相同,K因子不能近似取为常数。
短句来源
     We also will find the average momentum and the probabilistic distribution of one atom when the other one is detected hi superposition state.
     同时,揭示了当一原子处于某迭加态时,另一原子的平均动量和几率分布。
短句来源
     The energy budgets on Pacific Ocean in 1972 and 1975 are also calculated. It is found that the yearly variations of energy budget in 1972 is much less than that in 1975, which is mainly caused by the changes of sensible and latent heat fluxes.
     因此方法二在计算月平均动量通量时必须作订正,或直接用方法一进行计算,本文同时计算比较了1972年(E1 Nino年)和1975年(非E1 Nino年)太平洋洋面的各项能量及总能量收支,发现1972年洋面能量收支年变化幅度比1975年小得多,其差别主要决定于感热和潜热的变化。
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  相似匹配句对
     BUU Calculation With Momentum Dependent Mean Field
     动量相关平均场的BUU计算
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     For a sample of 38 sources we derive an average value of
     平均结果为
短句来源
     The Expression and Application of the Average Velocity of the Law of Conservation
     动量守恒定律的平均速度表示及其应用
短句来源
     Mean Entropy
     平均
短句来源
     Momentum and Enerqy of Turbulent Flow
     紊流的动量和能量
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  mean momentum
A nearly transverse flux of mean multiplicity about 10 to 15 nucleons is initiated by a recoil nucleon of mean momentum about 240 MeV/c in the quasielastic scattering of an incident proton.
      
New Reynolds' mean momentum equations including both turbulent viscosity and dispersion are used to analyze atmospheric balance motions of the planetary boundary layer.
      
New Reynolds mean momentum equations including turbulent viscosity and dispersion are used to analyze the vertical profile of wind speed in the surface layer.
      
The solution to the Cauchy problem is used to determine the electron's mean momentum as a function of time, initial conditions, and the applied field.
      
Given an initial state, the mean momentum characterizes the mean current and the conductivity of an asymmetric periodic structure known as the ratchet potential.
      
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The regions with shear stress and mean velocity gradient of opposite sign often exist in complex turbulent shear flows. In these cases, the eddy viscosity hypothesis break down. Hinze regarded the departure from eddy viscosity hypothesis as a result from transportation of mean momentum over distance by the large structures and arrived at a shear stress expression including the second order derivatives of the mean velocity. However, he gave correct results only qualitatively. The present author investigated the...

The regions with shear stress and mean velocity gradient of opposite sign often exist in complex turbulent shear flows. In these cases, the eddy viscosity hypothesis break down. Hinze regarded the departure from eddy viscosity hypothesis as a result from transportation of mean momentum over distance by the large structures and arrived at a shear stress expression including the second order derivatives of the mean velocity. However, he gave correct results only qualitatively. The present author investigated the expression further and found it greatly over-estimated the shear stress. This means that the flow particles is unlikely to have enough memory of the mean momentum over distance. By assuming the departure from eddy viscosity hypothesis as a result from transportation of shear stress contained in smaller eddies over distance by the large structures, the present author arrived at a new shear stress expression The shear stress estimated so far were in good agreement with the experiment.

在复杂湍流剪切流中经常会遇到雷诺剪应力与法向速度梯度的反号问题,此时涡粘性假设不再适用。Hinze从湍流结构中存在大涡的概念出发提出了包含台劳级数二阶项的剪应力表达式,取得了正确的定性结果。作者进一步分析了Hinze公式,认为他未能取得合理的定量结果的主要原因,在于他的公式隐含着假设流体微团在大涡的输送作用下能对原有的平均动量有足够的记忆。本文从实验与计算的比较以及近代对湍流结构的知识出发,提出了新的假设。认为较小尺度的湍流结构在大涡的输送作用下能对所包含的剪应力有足够的记忆,在此假设下,推出了新的湍流剪应力表达式,计算结果与实验数据的初步比较说明了此假设的合理性。

The bulk transfer formula is often used to calculate the air-sea exchanges. There are two average methods to compute mean fluxes: (1) F1=ABand, (2 )F2 = AB, Obviously method (1) (M1) is reasonable, while method (2) (M2) is an approximate form in which the turbulent correlation term is omitted. In this paper the mean fluxes are calculated by using CO ADS date with M 1 and M2, respectively, under different average time to answer in what extent M2 approximates to M 1 . The results show that when M 2 is used to...

The bulk transfer formula is often used to calculate the air-sea exchanges. There are two average methods to compute mean fluxes: (1) F1=ABand, (2 )F2 = AB, Obviously method (1) (M1) is reasonable, while method (2) (M2) is an approximate form in which the turbulent correlation term is omitted. In this paper the mean fluxes are calculated by using CO ADS date with M 1 and M2, respectively, under different average time to answer in what extent M2 approximates to M 1 . The results show that when M 2 is used to calculate longterm average, the calculating results should be corrected if the average time is longer than 5 days. For using M2. the monthly and ten-day mean errors in sensible and latent heat fluxes are less than 20% and 10% respectively, which is accurate enough to calculate the average fluxes. For the momentum flux, the monthly and the momentum flux can only be calculated with Ml, or by using M2 with correction. The energy budgets on Pacific Ocean in 1972 and 1975 are also calculated. It is found that the yearly variations of energy budget in 1972 is much less than that in 1975, which is mainly caused by the changes of sensible and latent heat fluxes.

整体传输公式是一种常用的计算洋面海气通量的方法。在作气候平均计算时,存在两种平均方法:方法一F_1=AB及方法二F_2=AB。显然,方法一是合理的,而方法二是对方法一的近似。本文利用COADS资料针对不同的平均时间计算分析了方法二对方法一的近似程度,结果表明:利用方法二计算长期气候平均,平滑时间超过5天则对计算结果必须进行订正;对感热和潜热通量,月平均方法二在20%的精度内可代替方法一,而旬平均方法二则可在10%的精度内代替方法一;动量通量月平均和旬平均精度分别为40%和20%。因此方法二在计算月平均动量通量时必须作订正,或直接用方法一进行计算,本文同时计算比较了1972年(E1 Nino年)和1975年(非E1 Nino年)太平洋洋面的各项能量及总能量收支,发现1972年洋面能量收支年变化幅度比1975年小得多,其差别主要决定于感热和潜热的变化。

If we take a systen as a whole and combine coordinate transformation with the atmospheric dynamic equations, we can get an equation from which we can discuss the dynamical factors which control the movement of a system with close isohypse especially the lows like typhoons.

本文从系统作整体移动的角度出发,针对具有闭合等高线的系统尤其是低值系统,利用坐标变换并结合大气动力学方程组,导出了控制系统移速的方程,并由此讨论了直接影响台风移速的动力原因。指出了影响系统移速的九大因素:(1)系统内的体积平均的风速的改变;(2)系统的体积膨胀与收缩;(3)系统形状的改变;(4)体积平均的动量通量散度;(5)地转参数的作用;(6)环境压力场;(7)系统强度的变化;(8)地形的阻挡作用;(9)摩擦作用。并指出,若不考虑β效应,系统的涡、散场变化与系统移速无关。

 
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