Plasma polymerization by using a pulsed rf discharge was performed for preparation of ultra thin organic film. The discharge capacitively coupled was initiated in a box-type reactor at an uniform flow of an acetylene/argon mixture gas. 2-10 nm scale ultra thin hydrocarbon film was deposited on a silicon wafer. The surface topography of the film examined by AFM appears to be pinhole free. The distribution of thickness measured by an elipsometer suggested the reaction in gas phase is significant. Therefore, the theoretical calculation was performed by using a model of radical reaction in the gas phase, and the obtained equations were fitted well to the results of experiments.

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We have prepared colloidal noble metals (Ag, Au, Pt) by photoreduction of metal ions in solutions and examined their optical properties on the basis of Mie theory. Tractable expressions for the extinction coefficient, K_ext, scattering coefficient, K_sca, absorption coefficient, K_abs, have been introduced by expanding the denominator and numerator of Mie coefficients respectively in power series of a size parameter and assembling them. General features of calculated extinction spectra appear to be in nice accordance with the observed ones ; extinction maxima located at λ≅410 nm (Ag) and 540 nm (Au), and even optical density almost coincided each other in colloidal gold and platinum. It has been confirmed that our method is also useful to estimate the optical properties of colloidal semiconductor (AgCl) and insulator (SiO₂) in water. The present method seems to be superior to the conventional van de Hulst's equation because of its applicability to the colloidal system whose size parameter is larger than 0.6. Preparation, of complex colloids such as Ag/Au, Au/Pt, Ag/Pt and Metal/SiO₂ was attempted and their optical properties were examined by introducing an effective medium theory to estimate the optical constants of composite materials.

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This paper describes an application of thermography to determine surface temperature of liquid which is moving along a heated wall surface. Breakdown of a thin liquid film is known to cause a problem in the heat transfer surface leading to a serious burnout phenomenon. To develop a technique to prevent the burnout phenomena, the mechanism of the burnout needs to be understand. Thus, we measured transient surface temperature of a thin liquid film using a thermography. Emissivity and absorption coefficients of water, a silicon oil and 1-propanol were determined by comparing its thermocouple measurement. As a result:(1) emissivity of water, a silicon oil and 1-propanol was approximately 0.95 and (2) transient temperature profiles on a liquid surface of wavy flow were obtained.

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Aiming at manufacturing of filler metal for overlay welding, generally, produced in small quantity and various grades, by means of powder rolling a trial making of powder rolling equipment and an investigation of manufacturing conditions were made.
A new powder feeding method for keeping compacting rate constant was investigated.
Using relationship among density and thickness of green strip, rolling load and initial load (or initial roll gap), a controlling method for compacting a green strip of appointed characteristic could be obtained.
After welding test it was confirmed that a strip produced with only compaction and sintering was possible to be used as filler metal.

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The behaviour of ethylxanthate ion, EX-was studied by means of polarographic and spectroscopic methods. By employing polarographic method, the composition of a complexion between EX-and Cd²⁺ in the presence of an excess of EX-was found to be Cd (EX) ^2-₄ and overall-stability constant, β₄ to be 4 × 10¹¹.
From spectroscopic method, the formation of 1 : 1 complex ions, M (EX) ⁺, (M²⁺ : Pb, Cd, Cu, Zn, Ni, Co) was confirmed and the effects of these complex ions on the acid decomposition of KEX and on the solubility of M (EX) ₂ were discussed.
A few explanation was done on the mechanism of collection of sulfide minerals taking into consideration of these complex-formation.

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1～2年前から “電子翻訳機” が発売され, 民生用電子機器を扱う業界では, ポスト電卓として期待できるという見方もある.本文ではこれらのポータブル形の翻訳機の機能の概要, 大形計算機で行う機械翻訳の原理を中心に, 電子翻訳機について述べる.

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With the view to study the properties of the organic dithiophosphates and their related compounds as mining chemicals, dithiophosphates (Aerofloats), monothiophosphates and phosphates were chosen.
The solubilities of metal salts in various solvents, the oxidation reaction of those reagents, the complexformation reactions, the molecular-association in benzene solution and the contact angle on minerals in aqueous solutions were examined and the differences between those three reagents could be interpreted by the soft-hard Lewis acid-base theory.
From the results of the contact angle measurement it was found that the monothiophosphate ion might have a good selective property as presented by the American Cyanamid Co.

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This paper proposes a computer-supported collaborative learning environment to enhance knowledge creation, store and transfer in power system education. Recently power systems have become more complex than before. This situation has become more noticeable year by year, and there is a strong need to develop an educational system which is useful for novice engineers. A number of research on CAI (Computer-Assisted Instruction system) has been done to overcome the problem. A central concern of the research is to make computer more intelligent by applying Artificial Intelligence technology, such as knowledge representation, student modeling, etc. On the other hand our research focuses on collaboration of engineers as an important activity in learning process, and provides a collaborative learning environment to enhance knowledge creation, store and transfer in cooperation with other engineers. In terms of computer system the proposed system is a learning environment based on a personal visual simulator which has a function to support collaborative work with other engineers through computer network.
In this paper, first the significance of this research is made clear in comparison with research on CAI and CSCW (Computer-Supported Cooperative Work). Secondly, the features of the system, basic function, architecture of window sharing and data structures are explained in detail. Finally, the effectiveness of the system is discussed by using an example of power system, and results of simple evaluation are shown.

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