Kinds Of Technique Research Articles

Improvement of the structure properties for special steel wire by cold-rolling technique

The classical method of the producing special-steel wire is generally cold-drawing. The raw material for drawing is hot rolled rod bundle, the technical process is: annealing - soda wash - acid wash - water wash - stoving - coating - drawing, after numerous cycles of the technical process as shown above, the special-steel wire with thin diameter can been obtained. However the process steps are numerous, the production period is longer and the prouction cost is higher.Now we take new three-high cold continuous rolling technique the special-steel wire with thin diameter has been obtained without intermdiate annealing, The production rate has been remarkably raised, the production cost has been reduced and the production environment has been improved. In the further investigation, we know that, for two different kinds of special-steel wire produced by cold-rolling technique and by cold-drawing technique respectively, there is a marked difference in the structure properties of the wire. The present paper describes that, under two different kinds of technique as stated above, for Fe  Cr  Al special-steel wire, the surface state, the rate of the increasing in weight for high temperature oxidation, the variation of the alloy content, the oxide film and the section shape are obviously different. The results show that the cold - rolling technique can improve the surface state of the Fe  Cr  Al alloy wire, favor to form the compact oxide film in the surface and increase the oxidation resistance at high temperature of the alloy wire.

高エネルギー特集 １ プラズマ・レーザー利用 （２） レーザーによるウラン濃縮

In uranium enrichment by lasers in which the isotope shift, a very small difference of light absorbing frequency between isotopes is utilized, uranium 235 is excited selectively by lasers and separated from uranium 238. Therefore, the separation ef-ficiency is to be very high basically.Two kinds of technique using uranium atom and UF6 molecular have been in-vestigated and are called AVLIS (Atomic Vapor Laser Isotope Separation) and MLIS (Molecular Laser Isotope Separation), respectively. This paper explains briefly their principles, element devices and the status of the investigation into laser uranium enrichment in foreign countries and Japan.Development of the element devices by LASER-J is also mentioned.In the develop-ment of the laser system which is composed of copper vapor lasers and dye lasers, and the separation system of crucible, linear electron beam gun, uranium collectors and so on, the targets for a small pilot plant of LASER-J have been attained on the output power of lasers and electron beam gun, materials etc. These components will be further improved on the durability and the efficiency, and applied to the small pilot plant which aimes to achieve about 1tSWU/year capability with four wave three stage separation scheme.

Experimental Design in the Estimation of Heritability by Regression Methods

Crudely speaking, we have two different kinds of technique for the estimation of heritability, based on analysis of variance and regression coefficients respectively, though in some special cases we can cast the analysis in either form. The problems of design in the former have recently been discussed (Robertson, [1959]). In this paper, we shall be concerned with experimental designi in regression methods-in particular that of offspring on parent. We are then concerned to obtain the most accurate estimate of the regression coefficient (and of the heritability that derives from it) for a given expenditure of effort. This effort may be perhaps in time of measurement (as is often the case in Drosophila or in a carcass dissection in pigs) or in nmoney expended in the rearing of the animals (as would be the case for growth rate in beef cattle). We shall make the general assumption that, if n offspring are to be measured in each family, then the expenditure of effort can be considered as proportional to n + a where a is a constant depending on the particular circumstances. We are then concerned to find the optimum value of n. In general, it is known that if a regression is based on f observations (each observation correspoliding here to a family) then the sampling variance of the regression coefficient is given by

Traité de cytologie végétale

THE cells of plants and animals, on account of the variety of their constituents, are subject to many different kinds of analysis. All the constituents can be studied physically and chemically; all, even the usually structureless cytoplasm, can also be studied morphologically; and hence from developmental and systematic comparison they can be considered in regard to their genetic and physiological properties. Thus all the different kinds of technique and processes of inference known to biology have been applied to the cell, and it is clear that no attempt can yet be made to integrate the diverse body of data that has accumulated. On the other hand, it is equally evident that the student who is attempting a particular ttype of analysis in plant cells is not merely able to take into consideration the same kind of analysis in animal cells, but he is compelled to do so, if he is to arrive at any sound generalisations. Any separate account of plant or animal cytology must therefore be descriptive rather than inductive. Traite de cytologie vegetale. By Prof. A. Guilliermond G. Mangenot L. Plantefol. Pp. ix + 1195. (Paris: E. Le Francois, 1933.) 250 francs.