查询词典 field-glasses

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.

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、动量矩守恒定律

In the teaching of central field, we should pay attention to turning the relative motion of two - body into one dimentuonal radial motion by introducing two physical concepts of reduced mass and effective potential energy, and we should also pay attention that the area law is the geometrical description of the conservation of angular momentum in the central field.

在有心力场教学中，应着重强调指出：通过引入折合质量和有效势能这两个物理量，把二体相对运动问题转化为单体沿径向的一维运动问题；以及面积定律是质心在有心力场中角动量守恒的几何描述。

The results show that they relate to the dipole-dipole coupling strength between two atoms and atom-field coupling constant and nonlinear coefficient of field.

结果表明，它们与原子间的偶极相互作用、原子和光场的耦合系数以及非线性耦合系数有关。

Because of the complexity of the Earth's magnetic field and the constant changes it is impossible to predict what the field will be like anytime in the distant future.

因为地球磁场和持续变化的复杂性，要预测磁场在遥远的未来将是什么样子的是不可能的。

In fact, if we add a constant to the displacement field, the stress field would change but this is not the case with the LFD.

事实上，如果我们加上不断向位移场，应力场会改变，但事实并非如此，与lfd 。

Because the effect between flow field and stress field will never continue forever,it is important to ensure the constringency of the result.

由于实际工程渗流场和应力场在一定的条件下趋于平衡，所以在编程时要求确保结果具有很好的收敛性。

This essay intends to make an exploration of the urgency and necessity of the reform in the field of education under the influence of the revolution in information,with the emphasis on the realization of the new-type teaching procedure guided by modern educational technology and constructionist theory ,in order to construct more effective modern teaching mode,accelerate informationalization in the field of education and create an environment of modern educational technology.

探讨了在信息技术革命浪潮下传统教学模式必须变革的紧迫性和必要性，论述运用现代教育技术和建构主义理论，实现教学过程模式的转变，建构更为有效的现代教学模式的方法，并对加速教育信息化建设、现代化教育技术环境提出对策和建议

In this thesis, a semi-classical model of the force on an atom is used to describe the motion of a two-level atom interacting with a standing wave laser field. The velocity dependent force and momentum diffusion are derived through optical Bloch equations by using the matrix form of the continued fraction technique. By investigating the dynamic properties of atoms in laser field, we can control and manipulate the mechanical motion of an atom.

本文利用半经典理论，从二能级原子在激光驻波场中所满足的运动方程出发，推导出密度矩阵元所满足的递推关系，利用矩阵连分数方法求解出密度矩阵元，从而求出依赖于原子运动速度的光压力与动量扩散系数，通过讨论原子在激光场中的动力学行为，为原子在激光场中被囚禁、形成原子列阵以及可控制的量子态，从而为量子信息处理提供理论基础。

In the "hard" nonlinear regime, the radiation field is characterized by non-period of the field in time and the continuous power spectrum.

2在"硬"非线性区域，场的混沌振荡态是连续出现的，其特征是输出功率谱是连续谱。

In this paper,the boundary singular kernel method in Reproducing Kernel Paicle Method has been applied to impose the essential boundary conditions in EFGM by revising the MLS shape function.The stress field and the displacement field are analysed by linear elastic theory.The contour integral method is used to calculate the J-integral,then the stress intensity factors of mixed-mode crack is acquired.The correctness and the validity of the method are validated.

本文将再生核质点方法中的边界奇异权方法引入EFGM中，通过对MLS形函数进行修正实现了本质边界条件在节点处的精确施加；运用线弹性断裂理论分析裂纹板的应力应变场，采用围线积分法计算J积分，给出了复合型裂纹板的应力强度因子的无网格伽辽金方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。