First, survey of various types of high velocity loaders is presented. Next, whether breaking elongation ab of metal specimens is larger or smaller than its statical value, is discussed theore-tically basing upon elastic- or rigid-linearly work hardening material property. The theoretical relation of ab vs. V1 is saw teeth like. Last, it is shown that experimental relations of ab vs. Vr in the velocity range up to 200m/s (strain rate: 4×103/sec) for metals of ƒcc, bcc, & hcp crystal lattice systems are clearly correlated with their lattice systems.
At present, highly stable ovens for temperature control of crystal oscillators are being deve-loped in our country and abroad. But the basic knowledge of their design method and data of temperature distributions inside the ovens are deficient. It was to alleviate this deficiency of informations that this paper describes general features with respect to steady-state temperature distributions in right circular cylinder and also compared with experiments using laboratory ovens.
A continuous zone-melting apparatus has been developed for zone purification of organic com-pounds. Introduction of voids into the system maintains the material balance among the feed, enriching and stripping sections. There are reported details of techniques to establish material flow and also theoretical considerations on processes of material transport. The apparatus has been applied to purify naphthalene which contains anthracene as an impurity. The experimental results give the values of segregation coefficient for anthracene in naphthalene by means of the theoretical equation.
The characteristics, a modification, and uses of a transistorized storage counter are described. The circuit uses a MOS type FET as a memory voltage reading element. The memory voltage decay rate is better than -0.1%/min. at 30°C, 63% R.H. Because of its simple, compact, and light weight feature, the circuit will have many uses in nuclear instrumentations. By a modification of the pumping circuit of the storage counter, it can also serves as a pulse integrator for radiation dosimetry. A simple 15 channel pulse height analyzer utilizing the storage counters as memory devices has been constructed.
Ice single crystals of the size about 15cm both in diameter and length were grown from water by a modified Czochralski's method. Improvement of the method which enabled to obtain optically very perfect crystals was to rotate water container to ensure both thermally and structurally smooth interface between ice and water. Ways to avoid introducing visible imperfections like air bubbles, vapor figures and candle ices were examined. Dislocation density of the synthetic single crystals were measured by the method of etch pits and it was shown that the logarithm of density decreased with decrease of the logarithms of growth rate. Minimum dislocation density hitherto obtained (2×104cm-2) gave a good prospect to have good single crystals for the use for solid state studies of ice.
The spectral response changes of a silicon solar, cell damaged by γ-ray were measured. These changes suggest the decrease of minority carrier life time in the bulk, and the recombination centers introduced by the γ-ray irradiation. The calculated results of the spectral response are presented, which show the variation of response with minority carrier life time in the bulk region. Minority carrier life time in the bulk region were obtained by comparing experimental results with calculated curves. The densities of E-center in P/N-type cell were estimated with the minority carrier life times obtained in this way.