This paper sets out the recent research on combustion fired MHD power generation. In 1. the requrement for MHD in Japan is described: The auther reviews the basic principle of MHD and the current development of each component of MHD-steam plant in 2. and the economic position of the plant in 3.4. is devoted to give an outline of Japanese National Project on MHD generation.
The problem of the least intersection of circuit connection on a plane is one concerned with the plan of circuit connection. The intersection number of connected wires is to be made smallest on a plane. Such a problem as this is a fundamental problem as the field in which to realize circuit connection is two dimensional space like a board of printed circuit. In this report, the problem is divided into two part: one deals with connection on a half plane on which circuit elements are ranged on the boundary line; the other is concerned with connection on a plane in general. And the infimum of intersection number is found as all circuit elements are connected to each other using a single wire. In case of mentioned connection on a half plane, it is shown to be an ideal plan of connection as compared with the infimum. While connection plans which are not ideal but practical are proposed in case of connecting on a plane. Foregoing connection plans are applied to a problem of printed circuit, and then a upper bound of hole number bored in a board of printed circuit is found for averting intersections of connected wires. This result is interpreted as a part of fundamental theory of printed circuit on general surface.
In the pilot scale apparatus of radiation-induced polymerization of ethylene, the distribution of exposure dose rate along the axis of the autoclave was measured, and also calculated using a simple model. The calculated value and the observed one were in good agreements. The distri-bution of dose rate absorbed in ethylene compressed at 400 kg/cm2 in the autoclave was calculated. From this result the radiation absorption efficiency of this autoclave is found to be 0.22%.
It is very important to improve the undershoot on the amplifier system for the progression of the accuracy on the pulse height analysis. One of the undershoot occurs on the connecting points of the multi-stage amplifier and the selection of the small output impedance and the large coupling condenser at one stage is able to diminish it. Since the another one due to the differential characteristic of the radiation detector appears on the output of the pulse shaper, it is possible to cancel it by the delaied output signal of the radiation detector. In this paper, the theoretical cancellation by the adder and the experimental data are reported.
Thin film diodes of Al-Aluminum Oxide-Metal structure were made by vacuum deposition and their electrical conduction mechanims were investigated. Alminum oxide films of several hundreds angstrom thickness were prepared by plasma oxidation. The oxide film is transparent from the wavelength of 3000Å to 20μ and the threshold value for fundamental absorption lies near 2370Å. From the fact the discharge current followed an inverse time law and the residual voltage build-up was proportional to log t, it is concluded that trap levels are distributed in energy throughout the oxide films. The trap density is estimated to be more than 1019 1/cm3 and an electron capture cross section 7.4×10-14cm2. As the effect of traps was predominant in the oxide films, the current-voltage characteristics hold the relation for space-charge-limited current in the presence of traps, distributed in energy. The conclusion was confirmed by some numerical results.
It is an interesting problem'to study the lower pres-sure limits of streamer flash-over when a positive impulse voltage is applied to the needle-of-needle-plane electrode (gap length 11cm). On the X-ray film -which was put on the coplaner with electrode axis, the trace of first streamers disappears in, the region of 15_??_10 mmHg, but the light pulse of photomultiplier indicates that streamer flash-over also occures at 4 anmHg.
The FIM image of ‹001› oriented tungsten was observed at liquid nitrogen temperature. The tip was made from one of the samples which were cut out at an angle 45° to the rolling direction of tungsten sheet. The ‹001› orientation was infered from the following observations: (1) (001) face ap-peared in the image-center, (2) two  zone lines crossed at nearly right angles to each other in the image-center, (3) these zone lines were nearly linear, (4) the similar patterns were observed through the sequent removing of several tens of lattice layers by the field evaporation.