Approximations to the solution of linear Fredholm integrodifferential-difference equation of high order

There are few techniques available to numerically solve linear Fredholm integrodifferential-difference equation of high-order. In this paper we show that the Taylor matrix method is a very effective tool in numerically solving such problems. This method transforms the equation and the given conditions into the matrix equations. By merging these results, a new matrix equation which corresponds to a system of linear algebraic equation is obtained. The solution of this system yields the Taylor coefficients of the solution function. Some numerical results are also given to illustrate the efficiency of the method. Moreover, this method is valid for the differential, difference, differential-difference and Fredholm integral equations. In some numerical examples, MAPLE modules are designed for the purpose of testing and using the method.     

On the control of solutions of a viscoelastic equation

In this paper we consider the semilinear viscoelastic equation

     

On certain meromorphic p-valent starlike functions

A certain differential operator D^n+p is introduced for functions of the form

     

Controllability of mixed Volterra-Fredholm-type integro-differential systems in Banach space

Dhakne and Kendre [On abstract nonlinear mixed Volterra-Fredholm integro-differential equations, Presented Paper in the International Conference at IIT-Bombay, 11-13 December, 2004] has proved the existence of the abstract nonlinear mixed Volterra-Fredholm integro-differential system of the type

     

Periodic solutions for a kind of Rayleigh equation with two deviating arguments

In this paper, we use the coincidence degree theory to establish new results on the existence of T-periodic solutions for the Rayleigh equation with two deviating arguments of the form

x^″+f(x^′(t))+g₁(t,x(t-τ₁(t)))+g₂(t,x(t-τ₂(t)))=p(t).     

基于C/S架构的科研管理系统的研究与设计

在高校,科研管理水平的高低反映了一个学校的整体实力和对外形象。笔者根据调查研究,制定出合理、规范的系统目标,分析该系统所需要各种身份用户,对每种身份用户的权限进行介绍。采用C/S架构把高校科研管理系统分成三大子系统,将每个子系统细化为几个模块,然后对每个模块进行研究与设计。     

Controllability of Volterra-Fredholm type systems in Banach spaces

We show the results in Chalishajar [Controllability of mixed Volterra-Fredholm-type integro-differential systems in Banach space, J. Franklin Inst. 344(1) (2007) 12-21] and Chang and Chalishajar [Controllability of mixed Volterra-Fredholm type integro-differential systems in Banach space, J. Franklin Inst., doi:10.1016/j.jfranklin.2008.02.002] are only valid for ordinary differential control systems. As a result the examples provided cannot be recovered as applications of the abstract results.     

The impact of firm participation in R&D programmes on R&D partnerships

R&D subsidies designed to encourage innovation efforts by firms may have intended and unintended effects on the way they organize their innovation process. We present empirical evidence on how R&D subsidies affect firms’ R&D cooperation strategies. In particular, we investigate whether receiving public R&D subsidies affect the probability that a firm will set up an R&D partnership with a public research organization (PRO), or with other firms. Our main findings are: (i) public support significantly increases the chances that a firm will cooperate with a PRO, and (ii) public support also increases the likelihood that a firm will establish private partnerships, but to a smaller extent and only when firms have intangible knowledge assets. These results suggest that public R&D programmes trigger a behavioural change in firms’ R&D partnerships, alleviating barriers to cooperation.     

What factors determine the mode of overseas R&D by multinationals? Empirical evidence

The large expansion of MNC's overseas R&D is noteworthy. This paper investigates the factors affecting the expansion of support-oriented R&D and knowledge sourcing R&D by using qualitative data which indicate the modes of R&D conducted at a plant site and a laboratory. The empirical results suggest that (1) the export propensity of affiliate firms, relative abundance of human resources for R&D, and accumulated technological knowledge have a positive effect on both the modes of R&D at a plant site and a laboratory, and (2) the stronger enforcement of intellectual property positively affects the expansion of knowledge sourcing R&D. These results show that not only firm-specific but also country-specific factors positively affect the overseas expansion of R&D.     

Approximate controllability of nonlinear stochastic evolution systems with time-varying delays

In this paper, the approximate controllability of nonlinear stochastic evolution time-varying delay systems with preassigned responses is studied. The necessary conditions for controllability results of nonlinear systems are not associated with linear systems. No compactness assumptions are imposed in the main results.     

基于Matlab/Simulink的GPS中频信号仿真

随着GPS应用领域的日益广泛,用户对GPS接收机的性能提出了更高的要求,研制出各种高性能的GPS接收机势在必行。而对GPS接收机的所有研究都是基于GPS中频信号的。在此背景下,本文在分析GPS中频信号生成原理的基础上,利用MATLAB/simulink搭建了GPS中频信号仿真平台;特别对C/A码的生成过程和C/A码的性能进行了详细研究;最后利用直接序列扩频生成了GPS L1 C/A信号。     

模拟开关CD4053在单片机中的应用研究

本文阐述了模拟开关CD4053在单片机中的应用,包括模拟开关CD4053实现的防抖动电路,CD4053与单片机的硬件连接及其应用技巧。     

Mathematical study of h-index sequences

This paper studies mathematical properties of h-index sequences as developed by Liang [Liang, L. (2006). h-Index sequence and h-index matrix: Constructions and applications. Scientometrics,69(1), 153–159]. For practical reasons, Liming studies such sequences where the time goes backwards while it is more logical to use the time going forward (real career periods). Both type of h-index sequences are studied here and their interrelations are revealed. We show cases where these sequences are convex, linear and concave. We also show that, when one of the sequences is convex then the other one is concave, showing that the reverse-time sequence, in general, cannot be used to derive similar properties of the (difficult to obtain) forward time sequence. We show that both sequences are the same if and only if the author produces the same number of papers per year. If the author produces an increasing number of papers per year, then Liang’s h-sequences are above the “normal” ones. All these results are also valid for g- and R-sequences. The results are confirmed by the h-, g- and R-sequences (forward and reverse time) of the author.     

基于B/A/S架构的行政审批系统的设计与实现

文章设计了一种行政审批系统。该系统采用J2EE技术和B/A/S(浏览器/应用程序服务器/数据库服务器)三层架构来设计网络程序和用户界面,结合Web Service、XML等数据交换形式来构建整个系统的通讯和数据的交换,实现了行政审批的网络化。     

单圈T函数输出序列的线性复杂度

单圈T函数可以作为LFSR( linear feedback shift register)的代替组件用来设计序列密码,这样的序列密码算法在软件上具有很好的运行效率.研究了单圈T函数输出序列的线性复杂度等密码学性质.给出了当n为一般情况时,单圈T函数输出序列的线性复杂度,以及相应的极小多项武.