The new version of RIP is RIP-2. It allows packets to include such information as routing summary, classless interdomain routing, variable length subnet mask and simple authentication.

One characteristic of TRANSer is that it allows multiple source XML documents to map to the destination XML document which can be created or edited when designing.

Web Service is a new distributed computing technology, it allows the clients access the distant Web Service via . standard network transfer protocol(HTTP). The messages of request and response are all encoded in XML format. All these make Web Service platform-independent.

：The Winsock control shipped with Visual Basic is the very powerful tool. It allows implementing any Internet network protocol inside of your application.

Based on the principles of a variable structure system a design method for the variable structure control system with a variety of reference inputs is proposed in this paper.

It allows one to regenerate images with appreciable losses of their surface.

It allows one to describe all kinds of the right motions of some classes of controllable discontinuous systems.

The two-parameter case is of special importance because it allows one to make use of the graphical mathematics.

It allows one to construct the boundaries within a domain of integral constants that split satellite orbits into two classes depending on a possible collision with the central body due to third-body perturbations.

It allows one to formalize an algorithm of change from the problems of optimization to a boundary-value problem for a system of ordinary differential equations in the case of any optimization problem for which the pulse formulation makes sense.

Recently, digital computers are gradually used to replace analog or hybrid computations for implement of continuous-system simulations. Digital continuous-system simulation has significant advantages: better man-machine interaction, higher accuracy and reproducibility, more convenient programming and report generation, etc.The simulation user would like to have a more convenient and flexible simulation language, in order to be as free as possible from the details of computer programming and concentrate on his...

Recently, digital computers are gradually used to replace analog or hybrid computations for implement of continuous-system simulations. Digital continuous-system simulation has significant advantages: better man-machine interaction, higher accuracy and reproducibility, more convenient programming and report generation, etc.The simulation user would like to have a more convenient and flexible simulation language, in order to be as free as possible from the details of computer programming and concentrate on his system simulations. An equation-oriented BASIC simulation language which permits the user to enter first-order differential equations in essentially unchanged mathematical form is introduced in this paper. It may run on any machine which supports BASIC. The user does not even have to be familiar with BASIC so long as he follows the simple format specified. A computing example is given to illustrate its application.

In this paper, a new method for analysing the emission lines of solar prominences is presented. The main feature of this method is that the total optical depth (τ0), the Doppler width (ΔλD), and the factor of the change of the source function (α) are determined simultaneously by fitting the observational profile, adopting a changeable source function, and using non-linear least-square method.I. Fundamental MethodIf the source function changes linearly with optical depth, the theoretical profile shown in formulae...

In this paper, a new method for analysing the emission lines of solar prominences is presented. The main feature of this method is that the total optical depth (τ0), the Doppler width (ΔλD), and the factor of the change of the source function (α) are determined simultaneously by fitting the observational profile, adopting a changeable source function, and using non-linear least-square method.I. Fundamental MethodIf the source function changes linearly with optical depth, the theoretical profile shown in formulae (2)-(5) can be derived. Only if a>0, i.e. source function increases toward the center of a prominence, can the self-reverse profile appear. Therefore, the conclusion that the source functions of the Hα lines decrease toward the centers of the prominences, suggested by Jefferies and Orrall, and Stellamacher, should be reconsi-dered. The dependence of the theoretical profile on line parameters, as shown in formulae (7)-(9), is very complex. The ordinary linear least-square method can not be used for observational profile fitting. But, we can give parameters τo, Δλd and a a preliminary estimation by matrix T. The errors between the theoretical and the observational profiles under such a preliminary estimation are expressed by matrix DX. It is easy to get the least-square solution of parameter correction DY by fitting the observational profile, as equation (11) shows. Then, the best estimation of parameters, Y can be derived. Because the dependence of the profile on each parameter is far from linear, in fact, the above process of finding the solution must be repeated until further correcting does not reduce the errors between the theoretical and the observational profiles. The whole process is done by computer.Ⅱ. Main EesultsThe fundamental analyses of the observational profiles of early Balmer lines for ten prominences presented by Ye Shihui are shown in Table l. There, M is the number cf observational points, S is the square sum of errors between the theoretical and the observational profiles. The comparison between the theoretical and the observational profiles are shown in Pig. 1 a-e for prominence four. The results of the analyses of the Hα lines are shown in Table 3 and Fig. 3 a-j from no self-reverse lines through weak self-reverse lines to deep self-reverse lines. From these results the following conclusion can be drawn.1. Ignoring the change of the source function will seriously affect the determination of total optical depth for thick lines, especially for Hαlines; but the supposition of the constant source function is acceptable for most Balmer lines except for Hα and Hβ. The total optical depth will be over-estimated if the increase of the source function toward the center of a prominence is ignored; the total optical depth will be underestimated if the decrease of the source function is ignored.2. Extinction by self-absorption also bears a relationship with the change of the source function. When the source function increases towards the center of a prominence, extinction by self-absorption will be stronger; vice versa, extinction will be weaker. We have re-estimated the extinction by self-absorption for early Balmer lines. The results are shown in Table 2. Although it is not the thickest and brightest, the sixth prominence has the strongest extinction by self-absorption because of bigger a. The total energy of the Hα line for this prominence has been reduced by a factor of 14.27. It seems that Unsold under-estimated the effect of self-absorption, while Ye Shihui over-estimated the effect.The formulae (13-17) can be used for determining the theoretical extinction by self-absorption if radiation damping is ignored.3. The source functions of self-reverse Ha lines increase toward the centers of the prominences. The source functions in the center are 1.2-2.5 times those on the boundary. When the total optical depth is not very thick, as in prominence 8, the self-reversion can not appear, although the source function increases toward the center of the prominence. With the increase of TO and a, t

MDMS is a data management system designed especially for medical and chemical application. In addition to the usual data manipultation functions (insettring, retrieval, update and sorting), many application functions such as statistics, calculation, data coavertion, link to other programs etc., were also provided. Retrieval function was expanded to fulfill multi-keys and multi-criteria Boolean search. A new data type-triple value-was developed to store numerous clinical symptoms and signs. Using MDMS, several...

MDMS is a data management system designed especially for medical and chemical application. In addition to the usual data manipultation functions (insettring, retrieval, update and sorting), many application functions such as statistics, calculation, data coavertion, link to other programs etc., were also provided. Retrieval function was expanded to fulfill multi-keys and multi-criteria Boolean search. A new data type-triple value-was developed to store numerous clinical symptoms and signs. Using MDMS, several medical and chemical data bases had been established on micro or minicomputers. Four research projects are carried on smoothly using these data bases. MDMS fulfilled most of their requirements.