Some New Exact Solutions to the Dispersive Long-Wave Equation in(2+1)-Dimensional Spaces

In this paper, by using a further extended tanh method and symbolic computation system, some newsoliton-like and period form solutions of the dispersive long-wave equation in (2 1)-dimensional spaces are obtained.     

物料在多层流化床内非稳态干燥的实验研究

通过石英砂与绿豆在多层流化床内的非稳态干燥特性实验，得出与稳态干燥的重要区别即为没有稳定的值速干燥段。将Page方程修正后，可用于多层流化床非稳态干燥数据处理。推导出的非稳态干燥动力学方程证明在非稳态干燥时，不可能出现恒速干燥段，并表明变工况与快速高强度干燥是提高干燥速率的重要途径。     

线有向图的幂敛指数

设G是有向图，LG表示c的线有向图，本文得到了它们的幂敛指数及周期之间的关系：k（G）－1≤（LG）≤k（G）＋1,p（LG）=p（G）特别地，当G为本原图时有：k（LG）＝k（G）＋1     

"神舟"五号的空间环境保障

空间环境安全保障是载人航天器飞行安全和航天员生命安全保障的一个重要部分．文章从高层大气、高能辐射环境、流星体空间碎片和重大空间环境扰动事件等四个方面空间环境要素对载人航天的影响，介绍了空间环境预报中心为“神舟”五号载人飞行任务所作的空间环境保障工作．     

沿传输方向掺杂浓度渐变掺铒光纤放大器的研究

本文在分析了均匀掺杂分布式掺饵光纤放大器的基础上，提出了沿传输方向掺杂浓度线性单调下降（单变），和线性降升结合（两变）的两种渐变型分布式掺饵光纤放大器，并用传输方程研究和比较了透明传输和最佳掺杂浓度下，均匀、单变和两变型三种放大器中的信号和噪音的传输特性及放大器的噪音指数、信噪比、临界泵浦功能和最佳泵浦周期等特性．     

交联1，4－顺式聚丁二烯的取向结晶

用ＷＡＸＤ和ＳＡＸＳ研究交联１，４－顺式聚丁二烯的取向结晶．结果表明：该试样在拉伸状态时，形成折叠链片晶，而不是伸直链纤维晶．片晶之间不断产生新的片晶，使长周期减小，并且片晶的横向尺寸不断增大，由此导致结晶度增大．     

光滑轨道的最小周期(周期)

本文考虑动力系统 (dx)/(dt)=f(x),x∈E~n,得出其周期轨道x(t)的最小周期T>0满足: TC≥2π,其中,而且2π是最好的常数。     

A Novel Fabrication Technique of Long Period Fiber Gratings

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Presentation functions,fixed points,and a theory of scaling function dynamics

Presentation functions provide the time-ordered points of the forward dynamics of a system as successive inverse images. They generally determine objects constructed on trees, regular or otherwise, and immediately determine a functional form of the transfer matrix of these systems. Presentation functions for regular binary trees determine the associated forward dynamics to be that of a period doubling fixed point. They are generally parametrized by the trajectory scaling function of the dynamics in a natural way. The requirement that the forward dynamics be smooth with a critical point determines a complete set of equations whose solution is the scaling function. These equations are compatible with a dynamics in the space of scalings which is conjectured, with numerical and intuitive support, to possess its solution as a unique, globally attracting fixed point. It is argued that such dynamics is to be sought as a program for the solution of chaotic dynamics. In the course of the exposition new information pertaining to universal mode locking is presented.     

Symmetry breaking on a model of five-mode truncated Navier-Stokes equations

A symmetryless model of nonlinear first-order differential equations, obtained by perturbing a known model of five-mode truncated Navier-Stokes equations, is studied. Some interesting phenomena, such as the existence of an infinite sequence of bifurcations in a very narrow range of the parameter and the simultaneous presence of a strange attractor either with two fixed attracting points or with a periodic attracting orbit, are shown. Furthermore, two new sequences of period doubling bifurcations are found in the unperturbed model.