Ziro Koba
Kyoto University
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Featured researches published by Ziro Koba.
Progress of Theoretical Physics | 1955
Ziro Koba
Recently Halatnikovll* has given a variation principle to derive the equations of the relativistic hydrodynamics. His procedure is based on the analogy to the relativistic particle dynamics. In this note it will be shown that an alternative variation method, which closely resembles that of field dynamics, can describe the behaviour of an ideal compressible fluid if one restricts oneself to the two limiting cases of extremely high and of extremely low temperatures. The law of energy-momentum conservation for the compressible fluid is expressed by2)
Progress of Theoretical Physics Supplement | 1958
Ziro Koba
The characteristic behavior of a wave packet of a Dirac particle immediately after a precise position measurement, which is essentially due to the presence of inner degrees of freedom or the commutativity of the position and the velocity operators, is reinvestigated and compared with that of a fictitious one- component relativistic particle that is assumed to have only positive energy states. In order to distinguish this particle from a Dirac particle another hypothetical experiment of three successive position measurements is presented. Further, the procedure of this velocity measurement is analyzed by a three- dimensional treatment, which reveals the polarity of the Dirac electron and illustrates the non-commutativity of different components of the velocity. Finally the possibility of constructing sn arbitrarily small wave packet of a Dirac particle with positive energy states only, and the possibility of applying the present analysis to bosons are discussed.
Progress of Theoretical Physics | 1958
Ziro Koba
The large cross section and the high multiplicity of emitted pions are the most conspicuous features of nucleon-antinucleon annihilation experiments. A semiquantitative relation between these two facts is discussed. (A.C.)
Progress of Theoretical Physics | 1958
Ziro Koba; Gyo Takeda
Protein Science | 1959
Ziro Koba; Shuji Takagi
Progress of Theoretical Physics | 1956
Ziro Koba
Protein Science | 1963
Ziro Koba
Progress of Theoretical Physics | 1957
Ziro Koba
Progress of Theoretical Physics | 1950
Ziro Koba; Gyo Takeda
Protein Science | 1963
Ziro Koba