The tentative ideas on frontier problems of the external biofluiddynamics for miniaturized insect flight are given. The emphasis of investigations is put on the unsteady and viscous features of complex interactions between motile animals and their surrounding fluid media. A description of current situations on this research topic is outlined and some ideas on its future developments are mentioned.

Various mechanisms of electron photon interactions and their applications are first discussed and spontaneous radiation, coherent radiation and stimulated radiation are explained in general terms. The undulator radiation, which plays an important role in the third generation synchrotron radiation facilities and free electron lasers(FEL),is elaborated. A brief history of the developments of FEL is included to serve the purpose of illustrating the course of development and innovation in science and technology.A simplified version of FEL theory is presented to explain the two main domains of operation of FEL: i.e.,the small signal mode and the self amplified spontaneous emission mode. The technical requirements for the implementation of these two modes of operation are discussed and connection between FEL and linear electron position collider is mentioned. The latest situation of the world developments of FEL is given and an Infra red FEL that is in operation and a DUV FEL that is in the R D stage in China are presented as a concrete example of FEL facilities. A comparative appraisal of the different areas of applications of the conventional laser, the synchrotron radiation and FEL is given for reference.

A universal function f with summed form in dual reciprocity boundary element formulation for axisymmetric problems has been derived from three dimensional Poisson's equation whose right hand is radial basis function. The singularity on symmetric axis of the function f was eliminated by integral average of function f and selecting different function f on the basis of the different characteristic of calculated zones. The feasibility of present selection and the singularity processing of function f was well proved by the calculation of the transient heat conduction problems in solid cylinder and sphere.

Wavelet Image processing is applied in micro gravity combustion experiments.After processing of dynamic image of V flame in micro gravity, the information of the structure and instability of flame is distilled and analyzed.Therefore, it is implemented to investigate the structure and instabilities of flame through processing continuously dynamic image.

Based on differential equations of heat transfer, mass transfer, energy conservation and mass conservation, parameters and the motivity of heat transfer and mass transfer along the height of the humidifier were calculated and thus the design and off design performance of humidifier were uncovered.

The influence of position and horizontal scale of strong convective activities on the low frequency oscillation in the tropical atmosphere is discussed by using a simple three-dimensional numerical model of the tropical atmospheric motion including the wave CISK mechanism.The results show that the meridional position of strong convective activities has an important impact on the low frequency oscillation in the tropical atmosphere.When convctive activities are intensified over the equatorial Indian Ocean and the equatorial westerm Pacific,the oscillation excited by the intemal heating propagates eastward form the equatorial Indian Ocean and has a period of about 28 days, and its disturbance exhibits the combined Kelvin Rossby wave pattern and has an obvious baroclinic structure with the convergence in the lower atmosphere and the divergence in the upper atmosphere.However,when convective activities are intensfied over the tropical Indian Ocean and the tropical western Pacific around the Philippines,the oscillation excited by the internal heating propagates westward from the tropical western Pacific and has a period of about 30 days,and its distrubance has weaker baroclinic structure than that excited by the heating in the equatorial atmosphere,and it exhibits the Rossby wave pattern,which is closely associated with the South Asian summer monsoon.Moreover,the results show that a period and structure of oscillation is not dependent upon the zonal position of strong convective activities.The results also show that the horizontal scale of strong convection area has an obvious influence on the period of the low frequency oscillation in the tropical atmosphere.The strong convective activities over a smaller convection area can excite the low frequency oscillation with a smaller period.This can explain that the 10～20 days oscillation in the tropical atmosphere may be excited by the convective activities over a smaller convection area.

We studied the surface features of the quartz grains of the red clay loess deposits from Lingtai,Chinese Loess Plateau,and found that there are no significant differences between the quartz grains from the red clay and from the loess palaeosol layers.All of the samples displayed a similar assemblage of both the freshly crushed features and pits obtained from the collisions of grains during the wind transportation.We think that the red clay formation has a similar origin with the loess palaeosol deposits:the denudation of the plateau (maybe with the process of frost weathering) provides a large amount of silt material,then the northwestern winds blow them to the loess plateau hundreds kilometers away.The combination of the surface features shows that four transitions occurred during the last～7.0 Ma,～4.2～5.0 MaB.P.,～3.6 MaB.P.,～2.6MaB.P.and ～0.9 MaB.P.respectively.This may be related to the phasic uplift of the Tibetan Plateau.

This paper utilizes multi-angle NOAA satellite data and combines several main land cover type in agriculture-grazing neighboring zone of neimeng semi-arid region to study the method of obtaining and appraising the multi-angle directional information. After data pretreatment, atmosphere iterative inversion utilizing Ambrals model and Rahman model,we register the obtained multi-angle directional information with landuse map, normal NOAA 1B data to prove and evaluate its validation in enhancing precision and improving method on land type identifying, distilling, classifying. All these aim to integrate multi-angle remote sensing, model inversion, experimental simulation with practical application of satellite remote sensing. At last, we combine and appraise the classification ability of different multi-angle data respectively, and compare the classification result of different classification mode. The classification result shows that the whole classification precision can improve 2%～7% compared with normal 1B data by adding angle information.

In February, March,November and December 1999, atmospheric particle samples were collected with cascade sampler at northern suburb of Beijing. The elemental concentrations and elemental distribution of particles were obtained by PIXE method. From the observation, the elemental concentrations, elemental distribution and their changes are analyzed. It shows that the concentrations of S, K, As, Se during heating period are lower than that before heating period because of decrease of coal combustion. The concentration of Cu doubles due to the using heavy oil instead of coal for heating in winter. Concentration of Pb in atmospheric particles has decreased dramatically due to using non leaded gasoline. It shows that the chemical composition and source of atmospheric particles are changing greatly. The pollution condition of atmospheric particles in Beijing has been improved obviously because of air pollution control by local government.

In this paper we consider the construction of computational schemes which are not only square conservation schemes but also symplectic schemes (so they are called double nature schemes ) with a special transformation (called double nature transformation) in the conservative dynamical structure.

A generalized majority logic algorithm based on weight and threshold on F 2 is proposed.The threshold and success probability are exactly given,and its applicability is discussed.

Formal methods for cryptographic protocol analysis has drawn attention in recent years This leads to a development of the generation and specification techniques of invariant Invariantis defined what messages an intruder can and cannot learn and can be used to prove authentication as well as secrecy results, appear to be central This paper introducls an overview of invariant in different systems, analyzes their relationships to each other, develops a simple taxonomy, and discuses some of the implications for future research.

Describes traditional network security solution, and analyzes the architecture of today's network processor. The difference is that the latter tries to reduce the interaction between the host CPU and peripheral bus. So, add the function of packet and protocol process to the security processor.