邯郸市绿地景观的文脉解读与传承

摘要：文章初步分析了邯郸市绿地景观中的文脉体现现状,探讨该地域文脉的内涵及其在绿地中的解读与传承方式,指出其中的优势与不足。并提出与时俱进的理念和整体性规划建议,以期为当前的绿地系统规划中文脉传承问题提供有益的参考。     

A Boundary Element Separation Solution to the Elastic Contact Problems and the Optimal Penalty Factor

In this paper the boundary element separation to the elastic contact problems proposed by Kamiya is improved. It gives another optimal penalty factor to accelerate the iteratively saluting procedure, which makes a theoretical foundation for the application of computers' parallel processing method to reduce the calculation time and memory. A practical example is given to confirm the validity of the present method in comparison with Kamiya method.     

The Finite Element Simulation of Pipe Bend Forming

A dynamic explicit finite element method is used to pipe bend forming processes on bender in this paper.The degenerated shell element and co-rotational coordinate system are employed.The material of pipe is assumed to satisfy Hill's anisotropic elasto-plastic yield condition.The bend die and press die are assumed as rigid surfaces and the contact force is computed by penalty method.Several numerical examples are given.They show that this method is effective.     

Theoretical Analysis for the Performance of HVDC Grounds Electrodes and the Mathematical Modal

The performance of HVDC ground electrodes is analyzed in detail.On the basis of electromagnetic field theories and its assumptions,the mathematical model is built,the ground resistance,the distribution of potential and temperature are computed with the current field distributions of HVDC ground electrodes.     

A Thermomechanically Consistent Constitutive Model for Finite Elastoplastic Deformation

Based on a thermomechanically consistent mechanical model consisting of springs and plastic dashpots, a plastic constitutive equation for large deformation is derived. Then the incremental form of elastoplastic constitutive equation is developed, which can easily be applied to the finite element analysis and other numerical approaches. The method for the determination of the involved material constants is suggested, which is based on the concept of nonstress configuration proposed by Lee. The necking process of a circular bar subjected to large elastoplastic deformation is simulated and the comparison between the analytical and experimental results is quite satisfactory. The developed model does not use the eoncept of a yield surface, which effectively improves the convergence and computation efficiency.     

Elastic Buckling and Critical Load of an Pre- stressing Arch

According to the field theory of additional deformation on pre - stressed configuration , in the paper , the ordinary expression of the governing equation and variational equation of elastic buckling are brought forward . Under the theory system, through lowering dimensions, the governing equation and variational equation for the critical condition solution of elastic buckling of a plane arch are deduced, and the eigenvalues problem of the linear homogeneous differential equations corresponding to the equations are concluded While Abandoning the plane assumption and considering shearing deformation, the linear finite element method arithmetic of bending bar's cross section containing six degree of freedom is given. The process of derivation and calculational results show that, under this system info, the finite element equations of bending bar deduced are accurate and easy to be used to numeric calculations, and the conclusion achieved is more practical.     

Investigation on Ecological Design of Water Supply and Drainage of Residential Zone in Chongqing

In this paper, the correlative factor of ecological sub-zone, especially the correlative requirement of water use is studied. The role of the specialty of water supply and drainage in an ecological sub-zone is defined. In the light of the knowledge of water supply and drainage specialty, a new design idea for design of outside drainage network in living sub-zone is introduced. There are a lot of suitable conditions of such design to meet the water demands of ecological sub-zone in Chongqing.     

Experimental Study for the Movement of Liquid Droplets on the Surface with Gradient Surface Energy

By using the chemical vapor deposition (CVD), a surface with gradient surface energy is fabricated based on the treated silicon chip. The dodecyltrichlorosilane (C_(12)H_(25)Cl_3Si) and Octrytrichlorosilane (C_(8)H_(17)Cl_3Si) are used as the source of silanization. By using the measurement of sessile drop method, the surface with gradient surface energy was characterized by measuring the contact angle of small water which lied on the surface of the treated silicon chip. The experiment shows the liquid droplets are driven to move from hydrophobic to hydrophilic zone on the gradient surface which is placed horizontally, the diameter of the droplets are 1~3 mm, and the single droplet reached the maximum velocity of up to 0.9 m/s. Based on the experimental results, the mechanical of the movement of the liquid droplet on the gradient surface is researched.     

Analysis About The Rules of Buildings Fissure During Repeat Mining

Based on the field data of building fissure and surface horizontal deformation, the author analyzes the building fissure's developing rules during first mining and repeat mining separately, studies the special problem of building fissure's developing rules during repeat mining. From the analysis above, the typical curve between the building fissure's width and surface horizontal deformation during mining is acquired. During mining under the village, if the workface given keeps the same speed, it can ensure the building sustains gradation stretch and compression strain with equality speed, so the residue deformation of building is very small. Conversely, the damage of buildings will be very large. Because the building fissure is liable to occur and develop at spot where the fissure has been already exist, so it is important to maintain the damaged building before repeat mining.