岡山大学工学部 Acta Medica Okayama 0475-0071 9 2 1974 Dynamic Design of a Tunnel Diode Transistor Combined Circuit 107 118 EN 10.18926/15671 The dynamic design of a tunnel-diode-transistor combined circuit and the applied pulse circuits are discussed. The combined circuit, in which a tunnel diode is connected in parallel with the collector junction of a transistor, is used. The dynamic design procedure is considerably simplified by describing the transient behavior of a tunnel diode with a set of approximate expressions and by the help of a selfanalog simulator. This circuit is capable of carrying out both memory and majority logic operations, and serves as a basic unit for several different pulse circuits, such as a mcnostable circuit, a frequency divider, a ring counter, etc. No potential conflict of interest relevant to this article was reported.

岡山大学工学部 Acta Medica Okayama 0475-0071 9 2 1974 Computer Program of Forward Selection and Backward Elimination Procedure in Multiple Regression Analysis 89 105 EN 10.18926/15670 Multiple regression analysis are often used to explain the relation between the dependent variable and the independent variables. In case of that it arises necessity that the important independent variables which are closely correlated with the dependent variable are selected from among all given ones. There are some selection procedures. But these procedures can't be used usefully without using computer. Therefore two selection procedures that is Forward selection procedure and Backward elimination procedure in multiple regression analysis are programmed by Fortran Ⅳ. No potential conflict of interest relevant to this article was reported.

岡山大学工学部 Acta Medica Okayama 0475-0071 9 2 1974 Mass Fragmentations. II. Some Aspects of Mass Spectra from a Series of Compounds Related to Methyl dl-Jasmonate Syntheses 53 61 EN Sigeru Torii Hideo Tanaka Tadakatsu Mandai /10.18926/15667 This paper deals with graphical mass spectral data of the twentyfive compounds related to the preparation of methyl dl-jasmonate and its related materials. The fragmentations from the substituted cyclopentanones and norbornane derivatives can serve basic data for both characterization and elucidation of the structures of complex compounds referring to the preparation of principal components of jasmine flower. No potential conflict of interest relevant to this article was reported.

岡山大学工学部 Acta Medica Okayama 0475-0071 9 2 1974 Mass Spectral Fragmentations. I. Mass Spectral Date on the Synthetic Intermediates Related to the Preparation of Linaloyl Oxide 47 51 EN /10.18926/15666 This paper describes mass spectral data from synthetic intermediates of linaloyl oxide. The fragmentation of sulfur functional groups including compounds l-8 would provide fruitful evidences for structural assignment of acyclic and alicyclic monoterpenoid precursors. Since, 1,3-dithianyl group in l,2, and 3 can provide a base peak and the elimination of the sulfinyl group from 7 and 8 is considered to occur at the initial stage of the fragmentation. No potential conflict of interest relevant to this article was reported.

岡山大学工学部 Acta Medica Okayama 0475-0071 9 2 1974 Reduction of Engine Exhaust Noise by Throttling in an Exhaust Manifold 35 45 EN 10.18926/15665 This paper covers the work done in an attempt to reduce exhaust noise level without the decay of brake mean effective pressure of a two-cylinder two-stroke cycle engine, by means of an exhaust manifold having a throttle plate in its junction. The data are shown for various dimensions and configurations of the manifold and the discussion is given on the effect of exhaust throttling on exhaust noise level and engine performance. The principal results obtained by this study are as follows: (1) The lower limit of the throttle area was about onethird of a cross-sectional area of the manifold from the view point of brake mean effective pressure. (2) Within this limit brake mean effective pressure was scarcely influenced by throttling under the condition where a number of pressure oscillation related to the pulsation effect during an interval between discharges was less than 1.7. (3) A reduction in exhaust noise level attained was 8 dB(A) at higher engine speeds. (4) The junction angle of the manifold gave little significance to exhaust noise level and brake mean effective pressure. No potential conflict of interest relevant to this article was reported.