To improve expert system's applicability, we choose the accident tree technique which can be used for both qualitative analysis and quantitative analysis, and for both small systems and super systems as the expert analysis method.

Considering the generator unit’s self-exciting, overvoltage of the no-load circuit in course of power transmission, the structure of network and load distribution situation in the area of Heilongjiang, the whole network is divided into four small systems: JingPo Lake, LianHua factory, FuEr factory and HarBin.

Composition of Petri nets is an efficient analysis method from the properties of small systems to those of large systems. Composition product nets of Petri nets are proposed in this paper.

The potential for using the traditional technology of software Agents to exploit the Web-based social intelligence is obstructed, because this technology is only suited to closed and small systems, and no strong infrastructure is provided to support the management and control of social behavior of Agents.

A simple but practical model for the melting and superheating of metallic nanocrystals was presented on the basis of Hill thermodynamic theory for small systems and our equivalent model for cohesive energy and corresponding melting thermodynamics.

The main contents of the thesis includes: 1) Setting up a parallel computation model for electromagnetic transients, to realize a real-time simulation in comparably small systems by network partition and paralleling computation techniques;

As WEB becomes the fictitious place where people are engaged in the social activity --Social network based on WEB, how to develop the social intelligence based on WEB to become the important way to realize a new generation high-performance WEB The traditional technology of software agents are only suited to closed and small systems, and no strong infrastructure is provided to support the management and control of social behavior of agents.

Agents are being used in an increasingly wide variety of applications, ranging from comparatively small systems such as email filters to large, open, complex critical systems such as air traffic control.

In particular, the simulation results indicate that, for small systems, the adaptive metrics can improve the success ratio by as much as an order of magnitude.

Very small systems show a wide range of different execution times.

The results of the present work obtained for a small one-dimensional model agree well with the results for two-dimensional small systems and are analogous to the behavior of three-dimensional systems.

The approximate methods, which are the only means available for large systems, are generally based on decomposition, and make use of the exact methods for small systems.

The exact methods are appropriate for small systems.

First in this paper the mean 2-year mean winter and summer wind fields below 6kmover Tibetan Plateau and its surrounding are presented.In winter the main features on 1.5km(fig.1)and 3 km(fig.2)level are the splitting of the westlies over the plateau,the lineof convergence to the east of the plateau and the“dead-water”regions(characterized by calmwind and little disturbances,except small local vortices)respectively to the east and west of theplateau.On 6km(fig.4)the minor features disappear but the splitting...

First in this paper the mean 2-year mean winter and summer wind fields below 6kmover Tibetan Plateau and its surrounding are presented.In winter the main features on 1.5km(fig.1)and 3 km(fig.2)level are the splitting of the westlies over the plateau,the lineof convergence to the east of the plateau and the“dead-water”regions(characterized by calmwind and little disturbances,except small local vortices)respectively to the east and west of theplateau.On 6km(fig.4)the minor features disappear but the splitting is still evident.Insummer in the vicinity of the plateau low level wind blows cyclonically around it(fig.6—7).Surround this large cyclonic whirl are small systems.On 6km(fig.8)the wind blows anticy-clonically around the plateau.The center of the this anticyclone may be located at the SE cornerof the plateau.This kind of vertical structure of this wind field indicates that the temperatureover the plateau is higher than the surrounding.The region of high temperature is estimated toreach at least as high as 9 km.There is strong vertical motion in the vicinity of the plateau.In winter on its SE the motionis upward,while in the rest of the region the motion is in the main downward.In summer themean motion fundamentally upward velocity reaches about 1 cm/sec,on 6km.Mean advection and temperature gradient(fig.5 for winter and fig.9 for summer)between 3—6km are also calculated from the wind data under geostrophic assumption.Secondly the heat balance over the plateau is estimated from the calculation of short waveabsorption,codensation heating,long wave cooling,temperature advection,adiabatic cooling(or warming)due to vertical motion and turbulent heat transfer from the ground.From thiscalculation it is concluded that Tibetan Plateau is a heat source in summer,while in winter theresult is not very conclusive.Probably in winter the SE part of it plays a role of warm sourcewhile the rest of the plateau plays a role of cold source.

In this paper we invesigate the relative position of limit cycles of the system dx/dt=-y-y~2+mxy+dx,dy/dt=x(1+ax)(1)where α<0 and dm≠0. It is already known, that(1) can have limit cycles only when dm>0 and|d|<|m|. System (1)has four elementary critical points: O(0,0), M(0,-1), N'(-1/a,y_1'), R'(-a,y_2'), (y_1'>y_2'), where O and R' have index +1, M and N' have index -1. The main result in § 1 is the following: Theorem: (ⅰ)In case m>-a>0 and d>0 sufficiently small system, (1) has just two limit...

In this paper we invesigate the relative position of limit cycles of the system dx/dt=-y-y~2+mxy+dx,dy/dt=x(1+ax)(1)where α<0 and dm≠0. It is already known, that(1) can have limit cycles only when dm>0 and|d|<|m|. System (1)has four elementary critical points: O(0,0), M(0,-1), N'(-1/a,y_1'), R'(-a,y_2'), (y_1'>y_2'), where O and R' have index +1, M and N' have index -1. The main result in § 1 is the following: Theorem: (ⅰ)In case m>-a>0 and d>0 sufficiently small system, (1) has just two limit cycles, appearing separately in the neigh bourhood of 0 and R'. (ⅱ) In case-a>m>0, when d increases from zero, limit cycles appear first in the neighbourhood of O, and later also in the neighbourhood of R', they may exist at the same time. (ⅲ)In case 0>m>a and msystem (1) can have limit cycles in the neighbourhood of O or R', but ther can not exist at the same time. (ⅳ) In case a≥m, system (1) has no limit cycls in thg neighbourhood of R' for any d. In §2 we study the global topological structure of the trajectories of system (1)as well as the parity of the number of limit cycles which can appear in the neighbourhood of O or R'. It is interesting to nate that in cartain cases when |d|increases from zero to|m|, a semi-stable cycle suddently appears in the neighbourhood of R', and then breaks into (at least) two cycles, in which one is stable and the other is unstable.

It is shown through mathematical analysis that the regenerative utilization in industry must be put in the first place so as to effect secondary utilization of thermal energy. That the strengthening pf technological production and saving of fuel will decrease the thermal consumption per product has also been proved theoretically.The characteristics of closed regenerative utilization in flue gas recycle are discussed proving that the flue gas recycle can save fuel even when a small system is used or when...

It is shown through mathematical analysis that the regenerative utilization in industry must be put in the first place so as to effect secondary utilization of thermal energy. That the strengthening pf technological production and saving of fuel will decrease the thermal consumption per product has also been proved theoretically.The characteristics of closed regenerative utilization in flue gas recycle are discussed proving that the flue gas recycle can save fuel even when a small system is used or when the exchangers do not operate quite smoothly.To realize secondary thermal energy utilization by the waste heat boiler and waste heat power generation alone is not fully invulnerable theoretically.