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Based on the Rayleigh-Sommerfeld diffraction integral and complex analytical signal representation,the free-space propagation equation and its Fourier spectrum for ultrashort chirped pulsed Gaussian beams are derived,and the far-field analytical electric field and spatial intensity are presented.

基于瑞利-索末菲衍射积分，使用复解析信号法推导出了啁啾脉冲高斯光束在自由空间中的传输方程及其傅里叶谱，给出了远场的光场和空间光强的解析式，研究了啁啾参数C对脉冲光束传输的影响。

This paper considers weighted estimate s of polynomial operator spectra by using the methods of integral,Rayleigh theorem and Schwartz inequality and establishes the inequality of upper bound of the(n+1) spectrum by depending on the former n spectra and the estimated coefficient is independent of the measure of the domain.

考虑多项式算子谱的带权估计，利用分部积分、Rayleigh定理、Schwartz不等式等方法，建立了用前n个谱来估计第n+1个谱的上界的不等式，且其估计系数与区域度量无关。

In the case of simply supported ends, the Galerkin method is used to simplify the integro-partial-differential equation into an integro -differential equation. The equation is further simplified into a set of ordinary differential equations by introducing an additional variable. Finally, the numerical methods in modern nonlinear dynamics such as phase plane trajectory, power spectrum and Lyapunov exponents are adopted to investigate the dynamical behavior of the beam.

对于两端简支的情形，采用Galerkin方法简化为常微分－积分方程；然后通过引进附加变量的方法进一步简化为常微分方程；最后利用相平面图、功率谱和Lyapunov指数等非线性动力学中的数值方法识别梁的动力学行为。

Phonon spectrum throughout the Brillouin zone and the interatomic force constants are obtained using the density-functional perturbation theory by the linear response method.

在密度泛函微扰理论的框架下采用线性响应的方法得到了整个声子谱，并分析了原子间力常数。

This kind of sequences has very high frequency, it also has better characteristic of autocorrelation and intercorrelation. It present a new kind of selecting scheme for spread-spectrum communication.

在本文的最后，我们将讨论一种基于蔡氏电路的混沌扩频序列，这种混沌扩频序列可以做到很高序列脉冲频率，同时它同样具有良好的自相关特性和互相关特性，它为扩频通信提供了一种新的序列选择方案。

Unique spectral interference function deducted resolved ICP-OES analysis of complex sample matrix interference in the spectrum of problem

独有的扣除光谱干扰功能，解决了ICP-OES分析复杂基体样品中的谱线干扰问题

In an interleave division multiple access system, different interleavers are used for different users, and all the users employ a common spreading sequence to spread the spectrum.

交织分多址通信系统采用不同的交织器来区分不同的用户，各用户使用相同的扩频序列进行扩频，所以交织器在IDMA保密通信性能上有关键的作用。

The results indicate that concatenated codes with large inner interleaving depth have good performance and high spectrum efficiency.

分析及仿真结果表明：采用足够内交织深度的级联码系统的BER性能及带宽效率均较好。

Theoretical and Experimental results are presented of a new high-resolution single-tube color TV camera system using spectrum interleaving technique.

本文给出了采用频谱交错法设计高分辨力单管彩色摄像系统的理论计算结果。

Light propagation in atmosphere: Turbulence Spectrum and Intermittency.

饶瑞中。大气光传播研究中的湍流谱与间歇性。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。