PCAC Relation and Pion Production-Absorption in Nuclei

Nuclear PCAC relation is studied in the framework of the effective theory of nuclear interaction, in which the interaction of real pion production-absorption is expressed by many-body operators, and does not include the one-nucleon operator as was assumed in the conventional works, while the effective axial-vector current includes the one-nucleon current in contrast to the former interaction. This problem is investigated under the simple linear $\sigma$-model. Results are as folows: 1) The theory describes consistently the PCAC relation and the pion production-absorption process. 2) The conventional interpretation of the effective pion source function as the interaction Hamiltonian of pion production-absorption does not hold. 3) The effective pion source function still includes the one-nucleon operator for the pion production-absorption at threshold effectively, which may justify the conventional theory.Comment: 12 pages, 3 figure

Axially symmetrical Fabry-Perot oscillator with multiple devices inserted in dielectric substrate

We investigate an axially symmetrical Fabry-Perot oscillator with active devices inserted in a dielectric substrate for power combining of many more devices in the microwave and millimeter wave frequency range. Empirically in this oscillator, efficient power combining can be done when it oscillates approximately at the frequency which corresponds to the wavelength equal to twice the spacing between the devices. The wavelength in the dielectric is shorter than in free space, so we tried to insert the devices in the dielectric substrate in order to increase the number of devices. By measuring the oscillation frequency of the oscillator with sixteen devices at X-band, we confirmed that the spacing between devices was about a half wavelength in the dielectric. We achieved almost perfect power combining of sixteen device

Difference Methods for the Piston Problem

We shall consider a piston problem in hydrodynamics and give difference methos to to solve it. Our aim is to find the algorithm in the neighbourhood of the piston in which the piston motion is calculated simultaneously. In our experiment we shall use the modified Godunov's scheme in the interior region away from the piston. Our method is an extension of the scheme to the boundary value problem

Parallel Programming Language ADETRAN

Summary. The programming language called ADETRAN is described. It was developed for the parallel computer ADENA on the basis of FORTRAN 77. It is designed powerful enough to support some parallel control commands. In view of its FORTRAN-likeness, emphasis was placed on parallel syntax and control

ADENA Computer IV

A new parallel computer system, ADENA ⅠⅤ, is proposed as a most hopeful candidate for the next generation machine for supercomputing. It is a complex of vector processor units and ADENA's network and may be called a vector-parallel computer. Details of the architecture are exposed in relation to its usage, and an example of compact design is shown as a model for personal supercomputing. ADENA ⅠⅤ will succeed the present supercomputers of the vector type as well as ADENA ⅠⅠ and ⅠⅠⅠ, and it promises to have merits in relation to both present highend techniques. Its parallel language also may succeed ADETRAN for the ADENA family

ADENA Computer III

This paper gives a proposal about a new parallel architecture composed of many vector processors, and being especially designed for number-crunching simulation problems in engineering and science. This computer is elaborated to systematize up-to-date supercomputer units (vector processors) in a united parallel machine of the SIMD type. It also aims to reduce hardware quantity of communication network among so many processors as in ADENA Ⅰ and Ⅱ, proposed previously by the author

磁気圏におけるホイッスラーモード・トリガード放射の研究

京都大学新制・課程博士博士(工学)甲第24618号工博第5124号新制||工||1979(附属図書館)京都大学大学院工学研究科電気工学専攻(主査)教授 大村 善治, 教授 松尾 哲司, 教授 小嶋 浩嗣学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDFA

ADINA Computer II : I. Architecture and Theoretical estimates

This paper gives a proposal about a new parallel computer of a MIMD array type, being suitable especially for high speed computing in engineering and science. It has a master unit, N submaster units and N² slave units, having their own processors and private memories respectively. Also, there are common memories between every submaster and every corresponding slave and further buffer memories used for transferring data between any allowed pair of slaves. In comparison with the ADINA Computer I [1] proposed previously, the new computer (ADINA Computer II) is useful for not only one and two dimensional problems, but also for three dimensional problems. Furthermore, it more easily allows an increase of the number of processors. Theoretical estimates for some examples of computation show that the ADINA Computer II is also very efficient

ADINA Computer I and II : II. Data Structure

The ADINA Computer treats data of a characteristic structure which is very successful for parallel computation, and also shows well the structure of the machine itself. The data structure, as shown in this paper, is easily introduced into a high level programming language PASCAL. For illustration, some programs are shown by using the language