Showing papers by "Dalian University of Technology published in 1987"

Lysine-Mediated Tissue Osmication in Combination with a Tannin-Osmium Conductive Staining Method for Non-Coated Scanning Electron Microscopy of Biological Specimens

Abstract: Glutaraldehyde fixed rat kidney blocks showed no charging effect when treated with lysine and osmic acid and viewed in a scanning electron microscope using an acceleration voltage of 5-30kV and a specimen current of 1×10-10A. The podocyte processes and endothelial micropores of the glomerulus were visible without metal coating. Glutaraldehyde fixed, tannin-osmium impregnated and lysine-osmium treated specimens also showed no charging effect in the scanning electron microscope, yielding instead much clearer scanning images which were comparable to those obtained from gold-coated specimens or from tannin-osmium-thiocarbohydrazide-osmium impregnated specimens (MURAKAMI and JONES, 1980).

The large deflection method in the analysis of elasto-plastic instability of thin shells with initial imperfections

Abstract: The theory of the instability of thin elasto-plastic shells with initial imperfections is wrought with great difficulties in respect of the complexity of geometrical and physical nonlinearities This paper proposes a general method for analyzing the instability of stiffened thin elasto-plastic shells, with initial imperfections, under hydrostatic pressure The nonlinearity of the inelastic shell buckling problems is linearized by a series of anisotropic elastic shell buckling problems; the process of linearization, the computation of the bifurcation point and the limit load of the buckled shell are completed by a general computer programme This method has been applied to various shell structure problems such as the general instability of ring-reinforced cylindrical shells; the local buckling of shell plates between stiffeners; the buckling of stiffened conical shells and stiffened cylindrical panels; and the buckling of cylindrical shells with nonhomogeneity in the ring-stiffeners and the shell-plates Many experiments are made, and the analytical results are confirmed with the experimental data This proposed computer programme has been used in various engineering structural designs, such as the design of pressure hulls of submarines and the design of deep living torpedo shells The general idea of this theory and the computational method can also be used in the design of some aeronautical structures Recently, this method has been successfully used to solve the nonlinear buckling problems of cylindrical shells of composite materials with initial imperfections With these buckling problems, not only the geometrical nonlinearities of shells, but also the physical nonlinearities of the composite materials are considered This theory and the large deflection method have been introduced and discussed in detail in the recently published book Theory of stability of elasto-plastic thin shells [1]