Abstract:本文对于二阶椭圆型Euler方程组 -∑D_αF_(q_α~i)(x,u,Du)+F_(ui)(x,u,Du)=0得到了一些积分恒等式,利用这些恒等式证明了某些方程组非平凡解的不存在性。

Abstract:This paper discusses the relationship between the least square estimate (LSE) and the best linear unbiased estimate (BLUE) of the mean vector in a linear model with a singular covariance matrix. The identical sufficient and necessary conditions of these t

Abstract:The notion of uniformity on a fuzzy quasi atomic lattice is introduced and investigated. Among the interesting special cases are the classic uniformity and the fuzzy one.

Abstract:Falkner-Skan方程描述磁场中连续平直面上不可压缩粘性流的边界层流,本文研究此方程初值问题之解的渐近性质。

Abstract:Testing of eight large-scale concrete shear walls supported on frames is reported.Two of the specimens were subjucted to vertical loads only. The others were vertically loaded until the specified axial forces in the supporting columns were reached, and th

Abstract:This paper investigates the highway alignment in the fault structural zone. The distribution of the fault structures was found out by the methods of aerophotograph interpretation and geological survey. The stable locations of the subgrade, the bridge and

Abstract:近景摄影测量是一种不接触物体而精确地测量物体的空间坐标及绘图的新型测量方法。本文简述了近景摄影测量的基本原理,通过对汽车模型外壳的近最摄影测量试验,绘制出汽车车身外形图和解算出模型点的空间坐标,其精度可达±0.302mm。研究表明,在汽车外型设计和品质检测中采用这种方法是行之有效的。

Abstract:In this paper,based on the equivalent continuum model and the potential energy variational principle, the governing differential equations are obtained for the rectangular framed-tube structures, from which the displacement functions satisfying the bounda

Abstract:This paper is concerned with the time-varying multi-input nonlinear system (3). After detailed discussions the necessary and sufficient conditions are obtained for the local linear equivalence of system (3) and some sufficient conditions are obtained for

Abstract:This paper discusses the feasibility, conditions and the best scheme of using 3-phase SCR switches to close small inductance circuits without transients. It is pointed out that the 3-phase zero voltage switch used in the pure resistance circuits is a spec

Abstract:This paper discusses the design and implementation of application the generation system for the education statistics. To suit the change and the development of the form system, we present the assistant base tech- nique on the base of the basic princible o

Abstract:In this paper, the machining properties of stainless steel and mackenite metal are analyzed. The advantages of the ultrasonic wave vibration metal cutting are explained. Several experiments have been done on the machined surface roughness and hardness, cu

Abstract:This Paper suggests that the morphology of the molding sand movement in the shooting cylinder is the type of the plug during the bottom shooting and the compacting process can be divided into three stages.

Abstract:The method and the experimental conditions are reported for the determination of chemical oxygen demand (COD) with the direct potentiometry and the automatic potentiometric titration, in which a HCrO_4~- anion electrode is employed and a Pt electrode is u

Abstract:In this paper, a boundary numerical integral method is employed in which the source points of the fundamental solution has been moved outside the domain of the problem studied. We call this method as the nonsingular boundary integral method, which may avo

Abstract:In this paper, Navier's double triangular series method for four edges simply supported rectangular plates is generalized to solve the problem of the bending, buckling and vibration of arbitrary quadrilateral plates with variable thickness. The problem is

Abstract:本文在n(≥3)维欧氏空间R~n中建立了环的分块对称化原理,同时给出了环模的一个估计不等式,从而为研究空间拟共形映照提供了一种几何工具。

Abstract:This paper gives the necessary and sufficient condition that the Hankel operator in the weighted Bergman space is bounded and compact.