under another condition, the load response has the character of stress relaxation, the fatigue specimens are disabled by reason of appearing macroscopical cracks but geometrical shape keep as the initial compressing status, compressing ratio amplitude is the independent factor influencing on fatigue life;

In this paper, the multi-layers GaAs/GaAlAs LPE growth on the SI-GaAs terrace substrate with SiO_2 film is reported, and the affection of the thickness of the SiO_2 film for the crystallography is discussed.

The differential remnants deformations of the subgrade and track structures appear under the repeated load , it change the geometrical dimension of the subgrade and track structures.

(Ⅱ) Based on the internal comparability of macro topography and microcosmic real surfaces, DEM was introduced to tribology and used to describe microcosmic real surface. So a new way to describe tribological surfaces was supplied.

The results are given of numerical experiments (based on the method of large particles) that simulate the flow of a jet of ideal gas into a region of complicated geometrical shape.

The geometrical shape of the fractal structures observed experimentally can be described within the given mechanism, and their dimensionality can be estimated.

Geometrical shape resonances in multicenter systems with icosahedral symmetry: A controllable molecular trap for electrons

Variations of geometrical shape of woven and knitted specimens can be described by mathematical expressions of shortened epicycloids and Cassini ovals.

Meantime it is shown that the level of materials anisotropy can be decided on the basis of transformations of specimen's geometrical shape.

On recording a number of SACP's of tungsten specimen successively tilted -to different orientations, some anomolous patterns superimposed on the general SACP's were observed at the exact positions of <111> direction, <001> direction, and <011> direction. These anomolous patterns are similar to Kossel patterns observed with transmission electron microscope. Moreover, the present patterns have two additional important characteristics. First, the intensity distribution of patterns changes with the electron energy...

On recording a number of SACP's of tungsten specimen successively tilted -to different orientations, some anomolous patterns superimposed on the general SACP's were observed at the exact positions of <111> direction, <001> direction, and <011> direction. These anomolous patterns are similar to Kossel patterns observed with transmission electron microscope. Moreover, the present patterns have two additional important characteristics. First, the intensity distribution of patterns changes with the electron energy (the electron accelerating voltage). Second, the geometric feature of the patterns can be used to represent some characters of the internal structure of the crystal. Finally, from the view points of the anomolous scattering effect, and the parameter a, which represents the interaction strength between the crystal potential. and the incident electron, the origin of the contrast of these patterns was explained qualitatively.

In this paper, the authors put forward several viewpoints about the most commonly used slideways of hydrodynamic type. Firstly, the source of existing three shortcomings, i. e. heaviness, stick-slipping and quick-wearing, of the hydrodynamic type of slideways is the bad lubrication condition. Secondly, the most effective and simplest method to improve the lubrication condition of hydrodynamic type of slideway is to control the surface texture scientifically. Thirdly, at present time, only the hydrodynamic type...

In this paper, the authors put forward several viewpoints about the most commonly used slideways of hydrodynamic type. Firstly, the source of existing three shortcomings, i. e. heaviness, stick-slipping and quick-wearing, of the hydrodynamic type of slideways is the bad lubrication condition. Secondly, the most effective and simplest method to improve the lubrication condition of hydrodynamic type of slideway is to control the surface texture scientifically. Thirdly, at present time, only the hydrodynamic type of slideways is still short of reliable designing calculating method, the authors believe that one of the main reasons here is the lack of counting in surface texture in existing formulae. The authors have checked several current formulae by putting in known data, they always show considerable errors. Fourthly, the authors have made theoretical analysis and calculation to the slideway with "wide-shallow scraped" surfaces, which was created in China in 1960's, and the results are conformed with the experimental ones by and large. On the basis of theoretical analysis, we confirm the great potentiality of "wide-shallow scrapped" slideways which are usually used now in China. Fifthly, the author; propose to make modifying for JB 2278-78 to improve the norm of scraped surfaces.

In this paper, the formula for D~4 point-central projection was derived from the formula of dimensions of intersecting geometric figures by the author. BY using this formula the property of collineation and collecting property of D~4 point-central projection can be described clearly. The construction used to determine the perspective projection of a straight line segment. Which was presented in ref. [5], can be also used to construct the central projections of geometric figures of various dimensions. With this...

In this paper, the formula for D~4 point-central projection was derived from the formula of dimensions of intersecting geometric figures by the author. BY using this formula the property of collineation and collecting property of D~4 point-central projection can be described clearly. The construction used to determine the perspective projection of a straight line segment. Which was presented in ref. [5], can be also used to construct the central projections of geometric figures of various dimensions. With this construction, the vanishing point of straight lines and the vanishing line of plane can be discussed system- atically. particularly, this paper presented the concept of vanishing plane of the hyperplane and also analysed subordinate relationship between them; and the characteristics of central projection of geometric figures situated in particular positions,the 4-vanishing point-central projection of a hypercube and the triangular pyramid formed by its vanishing plane were also discussed in this paper.