查询词典 beam-focusing

An ultrashort pulsed-laser beam is composed of a series of monochromatic continuous waves. According to Parseval theorem, the time-averaged intensity can be calculated by the sum of the intensity of these monochromatic continuous waves. Then we derive an equation to study Talbot effect of a grating illuminated by an ultrashort pulsed-laser beam.

我们采用了频谱分析法，即把超短脉冲光波看成是由一系列的单色光波组成，根据Parseval定理，光栅Fresnel衍射的平均光强由一系列的单色光波的衍射光强之和而求得，这样我们给出了一种分析光栅在超短脉冲光波照射下泰伯效应特性的方法。

It is shown that the M×N ChG beams in turbulent undergo three stages of evolution with increasing propagation distance,and turbulence accelerates the evolution of three stages.The turbulence results in a spreading and degradation of the maximum intensity in the far field.But β-parameter decreases with increasing beam numbers M,separate distances xd and beam parameter δ.And there exists optimal values of xd and δ,and SR of the corresponding M×N ChG beams reaches its maximum.

研究表明：在湍流大气中，双曲余弦高斯列阵光束的传输将经历三个阶段的变化，并且湍流使得光束传输经历三阶段的进程加快；湍流导致双曲余弦高斯列阵光束扩展、最大峰值光强下降，但是，β参量随光束数目M、相邻子光束间距xd和光束参量δ的增加而减少，即光束扩展受湍流的影响减小；并且，存在最佳xd和δ值使得Strehl比取得极大值。

As the loading increases count of hit and AE energy increases markedly. This proves that safety assessment of crane beam by AET is fully creditable. It can accurately evaluate the critical degree of crack and the safety reliability of the crane beam.

随着载荷的增大，撞击计数和声发射能量都明显增大，这证明用声发射技术进行起重机梁的安全评价是完全可靠的，它可准确地评价裂纹的危险级别和起重机梁的安全可靠性。

It was clear that the Cherenkov radiation is result of the coupling between the slow TM mode propagated along the waveguide and the negative-energy space-charge mode propagated along the beam, and the coupling strength is proportional to the beam density.

分析结果表明：切伦科夫辐射是由沿介质同轴波导传播的慢波与沿薄环形相对论电子注传播的负能空间电荷波耦合所致，且其耦合强度与电子注的密度成正比；输出频率和波增长率随着填充等离子体密度的增大而提高；保持一定的输出频率，增大电子注的束流可得到高的微波输出功率。

In cases of several boundary conditions,the critical loads of Timoshenko beam are given and compared with the results of Euler beam.

在几类边界条件下，具体求解了线性弹性Timoshenko梁的临界载荷，并与Euler梁的结果进行比较。

In this paper, the modified motion equation of Timoshenko beam is first introduced, which is then compared with that of Timoshenko beam.

介绍了修正后的Timoshenko梁运动方程，并比较了修正Timoshenko梁与经典Timoshenko梁的运动方程。

All parameters of the criticalpoints of the Bernoulli-Euler beam and Timoshenko beam were derived.

分别把该准则应用于Bernoulli-Euler和Timoshenko梁的动态屈曲研究。

By analysis of the beam element, the governing partial differential equations of transverse vibrations of Timoshenko beam are derived by Newton's second law for the three kinds of boundary conditions.

首先通过对梁微单元体的受力分析，利用牛顿第二定律导出Timoshenko梁横向振动的偏微分控制方程和三种约束边界条件。

The stabilization problem of a nonuniform Timoshenko beam system with controllers at the beam's right tip with rotor inertia is studied.

研究了具有线性耗散边界控制的Timoshenko梁的边界反馈镇定问题。

Since the hot-rolled H-beam Magang has its unique advantages, welcomed the major construction and Design Institute vigorously promote the use of H-beam.

由于马钢的热轧H型钢有其独特的优点，欢迎各大建筑设计院大力推广使用H型钢。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷