查询词典 momentum

By expressing 4-angular momentum of the high-speed particular in the form of tensor ,and by Lorentz transformation,we can get the conversion equation of 3-dimension angular momentum and auxiliary vector.

高速运动质点的4-角动量表示成张量Jμv 的形式，通过对Jμv进行洛伦兹变换可以得到3维角动量L的变换关系以及辅助量G的变换关系，在经典过渡下，前者与角动量的伽利略变换相符合，后者恰好反映加速度a是伽利略变换的不变量。

The two-cycle variation in side force per 360° of roll under small bleed momentum is gradually evolved to one-cycle variation under large bleed momentum.

模型上的侧向力随模型滚转从小吹气量下的双周期变化逐渐演化成为大吹气量下的单周期变化，利用该渐变规律可以实现对非对称背涡流场的主动控制，提出了微量吹气扰动控制概念。

Because of the space is uniform,So that the momentum conservation is occurrence in nature,it explain the momentum conservation is a attribute of the space.

由空间的均匀性而导出的动量守恒，说明动量守恒是物质空间的一个基本属性，动量守恒在整个物理学的框架中应具有定律的基础地位。

In this paper, in the momentum space , the angular momentum operator and the boost vector operator, i.

在动量表象下对非零质量带自旋粒子的角动量算符和推动矢量算符也即Lorentz变换生成元进行了讨论，得到了它们按轨道和自旋两部分分拆的新的表达

Choose a gear that allows you to hold the ideal body position on the climb too easy a gear will give you a fast cadence forcing you into the saddle and preventing from using your legs to absorb shocks on the other hand too hard a gear lead to a loss of momentum if you hit an obstacle a common error is riders who shift the little chambering too soon when approaching a hill climb this can cost a loss of momentum at the base of the climb when they need it the most.

选择适合的齿数来让你保持理想的爬坡姿势，用太轻的齿数，会导致踩踏转数过快，这会迫使你紧贴座垫，同时也会使你的双腿失去避震的作用。另一方面，在碰到障碍物时，若使用过重的齿轮组合，则会让你失去动力。

The physics simulation of large spacecraft Single Gimble Control Moment Gyro attitude control and momentum management system was established, making use of three-axis air-bearing table as spacecraft dynamics simulation object. The mathematics model of SGCMG attitude control and momentum management system was deduced.

引言单框架控制力矩陀螺作为航天器姿态控制的执行机构，具有较大输出力矩的能力，控制特性线性度好，并具有很强的抗干扰性和很快响应速度等优点，在国际上己得到广泛应用，并且已经成为长寿命大型航天器首选的执行机构。

The nonlinear hyperbolic conservation laws of the transient flow of the media in gas pipeline are hard to he solved, so, the control conservation laws are constituted of mass, momentum arid energy conservation laws, TVD/Godunov hydrid algorithm is used to simulate the transient flow in gas pipeline, and the traditional splitting approach processing nonlinear convection in momentum equation is dismissed ,the convection tern; is directly processed, in the way, the stablization of the algorithm and emulating accuracy of the transient flow are greatly improved.

针对管道中介质瞬变流动的非线性偏微分方程组难以解析求解的问题，由质量、动量、能量三个偏微分方程构成的控制方程组，应用TVD/Godunov混合算法数值模拟天然气管道中气体的瞬变流动，摒弃了传统的差分方法时动量方程非线性时流项的线性化处理，而直接处理非线性对流项，从而大大提高了算法的稳定性和管道瞬变流动的仿真精度。

The basic characteristics of the Stark map of Ba atom are as follows: in weak-electric field, the Rydberg states with small angular momentum numbers show a quadratic Stark effect, and those with large angular momentum numbers no longer degenerate and show a linear Stark effect, which is hydrogenic.

研究结果表明：在弱电场下，低角动量态由于具有较大的量子亏损而随着电场强度显示出二次Stark效应；而高角动量态由于量子亏损为零，并在电场下解除简并，随着电场强度的增加而呈现线性Stark分裂，具有显著的类氢性质。

Electron momentum spectroscopy, which gives the information of themovement and correlation of electron through the measurement of the energy andthe momentum density of the electrons in the kinematically complete (e,2e)reaction, is the strong powerful tool that study the materiel structure of the time.

电子动量谱通过动能完全的(e，2e)反应，可以测量原子分子和固体中电子的能量和动量密度，给出物质中电子运动和关联的信息，是当代研究物质结构的强有力的工具。

Chem. Chem. Phys 2000, 2: 613, Chem. Phys, 2000, 259: 99. The results show that the product rotational angular momentum vector is not only aligned, but also along the y-axis perpendicular to the k-k' scattering plane on both PESs, orientation of product angular momentum vector depends on collision energies and PESs.

结果表明在两个势能面上产物的转动角动量矢量不仅取向，而且沿着y轴垂直于散射平面定向，产物的角动量定向依赖于碰撞能和势能面。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。