麦克斯韦方程中有某些特性是恒定不变的——磁场强度、电位移场以及描述电磁场电通量的坡印廷矢量。
Maxwell's equations conserve certain properties-the magnetic field intensity, the electric displacement field and the Poynting vector that describes the electric flux of an electromagnetic field.
如果取的向量场是处处恒定的，所有点都是平移关系，所以没有散度，因为导数为零。
If you take a vector field that is a constant vector field where everything just translates then there is no divergence involved because the derivatives will be zero.
这就要求计量部门具有能建立具有更高的精度、稳定性和可靠性的恒定的温度场环境的温度控制系统。
The measure department needs a temperature control system which should have higher precision, stability, dependability on founding a temperature entironment.
由质量守恒定律，质量密度增量来自未挠动的质量密度的散度和位移矢量场。
According to the law of mass conservation the incremental mass density can be inferred from the divergency of the scalar unperturbed mass density and the vectorial displacement field.
假设晶体侧面保持恒定的温度，讨论了不同泵浦源下，激光晶体的三维温度场的分布。
With different pump source, the three-dimensional temperature field in the laser crystal was simulated on condition that the temperature on the crystal side remained constant.
利用简单对称性的电磁场，讨论了场和电荷系统遵从的动量守恒、量矩守恒定律。
With a simple symmetrical electromagnetic field, the law of conservation of momentum and the law of conservation of angular momentum for electromagnetic field and charges system are investigated.
采用虚数场描述万有引力场，其场能密度是负实数，满足能量守恒定律。
The universal gravitation field is described by imaginary number in the paper. It's energy density is negative real number. And it accord with conservation of energy.
研究了全球卫星定位系统（ GPS）自动归航系统在恒定风场中归航轨迹的计算，探讨了系统能够达到预定目标点的条件，给出系统在几种变化风场中的轨迹图。
This paper analyses the trajectory of GPS automatics homing system in constant wind fields , and discusses the condition under which the gliding parachute system could reach preassigned location.
本文简略地描述了一个处理恒定电场中非线性电子输运的新方法，并用它讨论强场中声学和光学声子的联合散射效应。
A new approach to nonlinear electronic transport in solids is described briefly and is applied to the discussion of combined acoustic and optical phonon. scattering.
本文将土石堰过流场区分为一维恒定变量流场和二维恒定非达西渗流场；
The topping field of an earth-rock dam is divided into one-dimensional steady spatially varied flow field and two-dimensional Non-Darcy seepage flow field.
本文将土石堰过流场区分为一维恒定变量流场和二维恒定非达西渗流场；
The topping field of an earth-rock dam is divided into one-dimensional steady spatially varied flow field and two-dimensional Non-Darcy seepage flow field.
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