Showing papers by "Wuhan University of Technology published in 1990"
TL;DR: In this article, a detailed scan for tin was made from 482 to 490 eV on the underside of a float glass sample, measured in the as-received state and after argon ion etching for 25, 45, 65 and 85 min.
Abstract: XPS analysis associated with argon ion etching was carried out on the underside of float glass to determine the oxidation states of tin. XPS spectra of pure Sn, SnO and SnO2 specimens were measured at first. The binding energy of the Sn 3d5/2 peak in these specimens in 485.03, 486.80 and 487.16 eV, respectively. A detailed scan for tin was made from 482 to 490 eV on the underside of a float glass sample, measured in the as-received state and after argon ion etching for 25, 45, 65 and 85 min. The asymmetry of the Sn 3d bands in all cases indicated the presence of several valences of tin on the float glass surface. Bands for three chemical states obtained from the data on Sn, SnO and SnO2 were fitted to the spectra of the glass sample. The fit in all cases was excellent. On the basis of these excellent fits, it is thought that tin is present in the +4, +2 and 0 valence states. Based on changing ratios in the intensities of the three bands as a function of etching time, thus of depth below the original surface, the following conclusions were made: (1) Of the total tin content, Sn4+ is the largest fraction. (2) Deeper into the glass, the fraction of Sn4+ decreases gradually, while that of Sn2+ and Sn0 increases. (3) The total intensity of Sn 3d peak decreases with the etching depth.
60 citations
TL;DR: The fine structure of C4Al6SO16 and its four superstructures have been studied by means of electron diffraction and high resolution electron microscopy (HREM) as mentioned in this paper.
Abstract: The fine structure of unhydrated cement clinker Ca4Al6SO16 (C4A3S) and its four superstructures have been studied by means of electron diffraction and high resolution electron microscopy (HREM) The match between experimental images and simulated ones verifies the result of X-ray structural analysis: C4A3S having a cubic lattice with space group l43m,Z = 2 The frequent apperance of forbidden reflections such as 1/2, −1/2, 0 along the 〈110〉* directions of C4A3S imply the presence of superstructures which may be due to an orderly inverse occupation of Ca2+ ions Various structure models based upon the observed structural images have been proposed for these four superstructures A new cubic phase witha′ = 15 nm is also found by selected area electron diffraction (SAED)
8 citations
TL;DR: The spline boundary layer method as mentioned in this paper is a mixed method of the weighted residual and singular perturbation for the unsymmetrical bending problem of thin plates, and it can be used to obtain numerical solutions which are uniformly valid throughout the region.
4 citations
TL;DR: In this article, a series of sub-microscopic textures such as (010) multiple-chain faults and related fault terminations, (001) mechanical twinning, sub-grain boundaries or fault walls, tremolite fibrous pseudo-form of talc and intergrowth of tremolites and talc with (010)-as interface are revealed.
Abstract: Nephrite specimens from Longxi, Sichuan, prepared by ion-thinning and dispersion techniques have been studied using TEM and SAED. A series of sub-microscopic textures such as (010) multiple-chain faults and related fault terminations, (001) mechanical twinning, sub-grain boundaries or fault walls, tremolite fibrous pseudoform of talc and intergrowth of tremolite and talc with (010) as interface are revealed. By analogy of metallographic textures, characteristics and mechanisms of the process of “deformation — recovery — recrystallization” are discussed in detail, Topotactic reaction mechanism by which tremolite retrogresses to talc was studied and a retrogressive metamorphic origin of Longxi nephrite is proposed.
3 citations
01 Aug 1990
TL;DR: In this article, thin vanadium oxide coatings were made by vacuum evaporation followed by annealing post-treatment in the presence of air, and the thickness increased by a factor as large as 2.3 upon oxidation.
Abstract: Thin vanadium oxide coatings were made by vacuum evaporation followed by annealing posttreatment in
the presence of air. The thickness increased by a factor as large as 2.3 upon oxidation. Temperaturedependent
electrical conductivity as well as spectral transmittance were measured vs. annealing time; it took
a few hours to establish V02 with well-defined semiconductor-metal transition at 57°C. Electron
diffractograms indicated a bcc monoclinic transformation upon annealing, and electron micrographs
showed pronounced grain growth. Initial XPS core level spectra gave evidence for vanadium in different
oxidation states.
2 citations
01 Jan 1990
TL;DR: In this article, the relation of the sensitivity of an optical fiber magnetostrictive sensor to its jacket thickness has been investigated in detail, starting with the general formula for the magnetostricive strains, and then an explicit expression of the reflation of sensitivity to jacket thickness is given according to the formulas of photoelastic theory.
Abstract: The relation of the sensitivity of an optical fibre magnetostrictive sensor to its magnetostrictive jacket thickness has been investigated in detail in this paper. Starting with the general formula for the magnetostrictive strains, we may obtain the common strain of the fibre glued with a magnetostrictive jacket by the application of the condition of mechanical equilibrium, afterwards, an explicit expression of the reflation of sensitivity to jacket thickness is given according to the formulas of photoelastic theory.
1 citations
TL;DR: In this article, a singular perturbation solution of the deflection differential equation is given, and the equilibrium condition is checked and the inner forces solved by perturbations method and the outer load are fully equilibrated.
Abstract: This paper deals with the research of accuracy of differential equations of deflections. The basic idea is as follows. Firstly, considering the boundary effect the meridian midsurface displacement u=0, thus we derive the deflection differential equations; secondly we accurately prove that by use of the deflection differential equations or the original differential equations the same inner forces solutions are obtained; finally, we accurately prove that considering the boundary effect the meridian surface displacement u=0 is an exact solution. In this paper we give the singular perturbation solution of the deflection differential equations. Finally we check the equilibrium condition and prove the inner forces solved by perturbation method and the outer load are fully equilibrated. It shows that perturbation solution is accurate. On the other hand, it shows again that the deflection differential equation is an exact equation.
1 citations
TL;DR: In this article, the notion of embedding for family of quasi metric spaces in Menger spaces is introduced and its properties are investigated, and a common fixed point theorem for sequence of continuous mappings in menger space is proved.
Abstract: In this paper the notion of embedding for family of quasi metric spaces in Menger spaces is introduced and its properties are investigated. A common fixed point theorem for sequence of continuous mappings in Menger spaces is proved. These mappings are assumed to satisfy some generalizations of the contraction condition. The proving technique herein seems to be new even for mappings in Menger spaces.
TL;DR: Li2Mo2-xWxO6, with high conductivity is prepared by XPD, EDX graph, IR and ESR spectra, it was determined that the samples are composed of two phases as mentioned in this paper.
Abstract: The multicrystal multiphase ceramics material. Li2Mo2-xWxO6, with high conductivity is prepared. By XPD, EDX graph, IR and ESR spectra, it’s determined that the samples are composed of two phases. Li2MO1-xWx04 and MoO2. The electrical properties are studied by AC admittance bridge and complex impedance cpectroscopy. The ionic conductivity increases and conducted activation energy decreases with the tungsten content increasing. The micro-structure model and the ionic conducted mechanism are given in this paper.
TL;DR: In this paper, the condition de depart du modele utilise est une surface aleatoire d'atomes discrets dans une hypersphere a quatre dimensions.
Abstract: La condition de depart du modele utilise est une surface aleatoire d'atomes discrets dans une hypersphere a quatre dimensions. Par comparaison on etudie des systemes a deux et trois dimensions de meme densite et utilisant la meme interaction atomique
01 Jul 1990
TL;DR: In this article, an optical fiber magnetic field sensor system is described for measuring D.C. or low frequency fields, which is based on previous wored measurements of magnetic fields.
Abstract: This paper describes an optical fibre magnetic field sensor system, developed by us based on previous wored, for measuring D.C. or low frequency fields.
TL;DR: In this article, the concept of cohomological operator was proposed and the covariant derivative was brought into the extensive cohomology differential operator (ECO) to improve the Yang-Mills equation.
01 Jan 1990
TL;DR: In this article, the dynamic viscoelastic properties of composite materials using different interfacial substances (coupling agent) in the interface of composite material of glass fiber (GF)/unsaturated polyester resin(UP).
Abstract: We have studied the dynamic viscoelastic properties of composite materials using different interfacial substances (coupling agent) in the interface of composite material of glass fiber (GF)/unsaturated polyester resin(UP). The tan δ was related to the molecular structure of interfacial substances. The tan δ become greater with the greater soft interfacial layer. The IPN structure formation of interface not only increased the strength of composite material but also beneficial to deformation. It is helpful to absorbed energy with great tan δ.