Abstract:本文研究了在非离子表面活性剂存在下,5-Br-PADN与Mn(Ⅱ)的显色反应及其应用.所拟方法能满意地用分光光度法测定钢样中的微量锰.

Abstract:用"P"盐对低密度(<1.28克/厘米~3)水玻璃改性处理,可使精铸型壳残留强度σ弯稳定在(9～15)×10~5Pa范围内,初步解决了推广这一新工艺的难题.

Abstract:We study in this paper the disturbation of linear elliptic variational inequalities in Hilbert spaces. A more general sufficient conditon for the convergence of the solution of disturbed problem to the solution of the original problem is obtained.

Abstract:In this paper, some new sufficient condions for the oscillation of two kinds of mixed neutral differential equations are obtained, which improve greatly the results in [5,7-9] . Furthermore, extensions to mixed neutral equations with variable coefficients

Abstract:We often use the mutipole interactions (quadupole, octupole interaction, etc.) in the study of nuclear structure. In this paper, the general formulas of matrix elements of multipole interaction in shell model are derived. These formulas can be used in the

Abstract:The study of homogeneity for surface composition of AgNi two phase alloys at room temperature was first reported in this paper. It was found that whether for the natural surface which was not bombardment, for the clean surface that the impurities were rem

Abstract:In this paper we demonstrate that under certain conditions the three basic distribution function models to describe the gap state density of amorphous silicon (a-Si), i.e. uniform distribution, exponential distribution and hyperbolic distribution are also

Abstract:The problem concerning principal mode of a system with equal natural frequencies puzzles most juniors and up to the present. Almost all the books on vibration in China have not dealt with the problem theoretically in detail. This paper discusses the probl

Abstract:Based on compounding toluene and benzylchlorid, the synthetic technology of benzyltoluene was proposed. The refinement of the benzyltoluene was studied. The properties of the benzyltoluene impregnant were tested. The model capacitors using benzyltoluene i

Abstract:By comparing broken line method and arc method with cubic spline function method and analysing the curve of Swiss 500 mould-mouth, we conclude that the cubic spline method has the advantages of higher smoothness, better mechanical properties, less extrusi

Abstract:In this paper, the optimization experiments of the anaerobic adhesive compositions were introduced.The adhesives were made up as monomers with DEGDA/HPA, as accelerator/coaccelerator with N, N-dimethyl aniline/saccharin or only accelerator with trichloroa

Abstract:The present state-of-art in the field of earthquake-induced lateral soil pressures on retaining wall is described in this paper in a brief manner. Two simplified formulae, which accord with well known Mononobe-Okabe solution and are convenient for enginee

Abstract:This paper presents a process of backwater's air-adding at a deep well. Preliminary experimental study on its effectiveness indicates that it is a new-type of air-adding process, which has properties of adding air to and partly removing iron from gronnd w

Abstract:Concrete is a material of heterogeneity with microcraekes in-side. Its fracture process is complicated. It is shown in many experiments that fracture toughness may reflect the fracture property of cracked material and the fracture process of concrete elem

Abstract:A practical method for deriving machine parameters from on load tests is proposed. The parameters are calculated from the data of small perturbations of the generator voltage, current and rotor angle during system disturbances. The saturation effect and o

Abstract:Under some specific conditions, such as a couple of surfaces occurs relative motion which have the same size but have not a rule of distribution, only after a period of relative motion they can coincide again. This property of motion can be used in some c

Abstract:In this paper, the structural properties of new carbide twist drills are explained simply.Several experiments have been done about the axial thrust force, cutting deformation, machining efficiency, precision and surface roughness of machined hole and the

Abstract:The driverless vehicle is one or tne lmportant ? pment of the flexible manufacturing system. This article probes into the function design, the types election, and the main problems which should be considered in designing the component parts of the driverl

Abstract:This paper theoretically analysed the melting mechanism of CuPb alloy during the remelting process and the formation principle of melting superheating when Cu-Pb alloy is melted in a natural unequilibrium process, which are indirectly proved through ?

Abstract:This paper studies the construction of complementary energy functional for general elastic contact problems and its solving. General elastic contact problems are resulted in quadratic programming . With Lemke algorithm, we find Complementary Basic Feasibl