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[en] A method is developed for numerical solution of the coupled differential equations arising in close-coupling treatments of multi-channel scattering problems. The method consists of replacing the coupling potentials in the differential equations with approximate potentials; these approximate potentials are constructed according to a special procedure. This procedure assures both that the resulting approximate differential equations can be solved exactly without excessive computational difficulty, and that the solutions obtained are very good approximations of the exact solutions of the original equations

[en] Herein disclosed is a method of fitting together cage structures, each made of a different material. The cage structure may be an ultrahigh speed rotary drum for a centrifuge. An inner cylinder of, for example, Al alloy, to be inserted in an outer cylinder made of a material such as carbon fiber reinforced plastic is filament-wound with a resin-impregnated carbon fiber under application of an axial tensile force to the inner cylinder so as to contract the radius thereof, and then after-cured to cool down to room temperature. The tensile force is then released to permit the radially contracted inner cylinder to elastically recover its original form and to thereby eliminate a gap formed between both cylinders due to aftercure, providing that the width of the gap is equal to that of the radial contraction, determined by Poisson's ratio, of the Al alloy material. Thus, the inner cylinder can be firmly fitted within the outer cylinder in accordance with the elastic deformation of the material. (Ohno, Y.)

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[en] Creep tests with uniaxial stress and pure shear have been carried out in order to determine the behaviour of soft plastics, which is governed by a non-linear material law, and to apply it to the photoelastic analysis of biaxial stress in plastic components under quasistatic and isothermal loads. The test facility is described as well as the technique applied to correct stress/creep curves for sigma=const. Results are presented for plane and tubular samples of soft PVC and an unsaturated polyester. (orig.)

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[en] The role of boundary conditions for the correct formulation photoelasticity problems based on the restoration of tensor fields by means of optical tomography is presented in this article. (orig.)