Materials Literature
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A method is presented to establish a multisection network model for study of high-frequency transient behavior of transformer and machine windings. The parameters of the network model are estimated using the maximum-likelihood estimation technique. In order to verify the proposed estimation method, the parameters of a…
The Bi 2 O 3 ‐rich side of the system Bi 2 O 3 ‐SiO 2 was studied with powder X‐ray diffraction and differential thermal analysis. In the composition 6Bi 2 O 3 . x SiO 2 , the metastable γ phase (bcc) was observed to exist over the range of 0 < x ≤ 1. In most of the compositions studied, metastable phases of water‐que…
Abstract A series of natural rubber vulcanizates containing varied amounts of sulfur and an accelerator (N‐cyclohexyl‐2‐benzothiazyl sulfenamide, CBS) were prepared and their resistance to attack by a strain of Nocardia , capable of utilizing natural rubber as carbon substrate, was examined. The higher the content of…
This paper discribes the development of Functionally Gradient Material (FGM) which is promoted by Science and Technology Agency with "special coordination funds for promoting science and. technology" from 1987. FGM is an advanced metal/ceramic compositional gradient from a metal side to a ceramic side to obtain the fu…
Surface Barkhausen noise (SBN) measurements were made on a 2% Mn pipeline steel sample subjected to different levels of applied tensile and compressive isostress. The magnetic field direction was varied through a full 360 degrees . SBN voltage was found to depend on both stress level and magnetic field direction. The…
The soft magnetic properties of sputtered (0 approximately 3-wt%) Si-Fe alloy thin films fabricated in (Ar+N/sub 2/) plasma were investigated in connection with metallurgical structure. 2.7-wt% Si-Fe film annealed at 400 degrees C shows a high effective permeability mu /sub eff/ of about 1600 at 5 MHz. It has been obs…
Electrochemical methods are extremely useful for the study of aqueous corrosion phenomena, particularly when utilized in conjunction with other techniques. Basic electrochemical principles are reviewed and examples given of application of a variety of electrochemical techniques to corrosion. Standards of ASTM Subcommi…
Abstract This article presents the following characteristics of pure metals : structure, chemical composition, mass characteristics, thermal properties, electrical properties, chemical properties, magnetic properties, optical properties, fabrication characteristics, nuclear properties, and mechanical properties.
All articles of this category The reaction of hexasodium benzenehexathiolate (1) and benzenehexathiol (7) with carbon disulfide is studied. Depending on the reaction conditions and the molar ratio of 1 or 7 to carbon disulfide the 1,3-benzodithiole-2-thiones 6 , the 2,6-dithioxobenzo[1,2- d : 4,5-d′]- 5 , the 2,5-dith…
Refined silk fibroin obtained from waste cocoons was dissolved in a mixture of ethanol and neutral salt (calcium chloride) solution and the solution thus obtained was centrifuged and then acidified with an organic acid after dialysis. The pH of the resulting solution was in the acid side of the isoelectric point (pl=3…
For pt.I see ibid., vol.25, 1029-1036, 1990. The purpose of this work is to verify the validity of the new degradation model and the transformation equations which have been developed on the basis of thermokinetic considerations. This verification is implemented by comparing the temperature index (TI) values obtained…
We describe the theory, design, and performance of a new surface-plasmon-polariton-(SPP) assisted Raman scattering instrument that exploits the Kretschmann geometry. In contrast to previous methods, our device allows the entire SPP emission cone to be collected, thus optimizing the detected Raman intensity. This advan…
High resolution electron microscope images in amorphous Pd–Si alloy were calculated with various structure models and compared with the observed ones. For the structure models, atomic models of (1) dense random packing (DRP), (2) FCC atom clusters (embedded in DRP structure) and (3) icosahedral atom clusters (embedded…
Adsorption of polystyrenes (PS) and poly(methyl methacrylate)(PMMA) onto a non-porous silica (Aerosil 130) in trichloroethylene at 25 °C has been studied using IR and UV spectroscopies. Three important quantities, namely the amount adsorbed, A, the fraction, θ, of the silanol groups occupied by polymer chains, and the…
Abstract Polyurethane films were prepared using diphenylmethanediisocyanate [MDI] or hexamethylenediisocyanate [HDI] and poly(propylene‐ethylene) glycol, in order to test them as biomedical materials specifically for use as skin grafts. Other ingredients such as catalysts, chain extenders, solvents, etc., where not us…
This paper presents some results on the surface treatments given to natural fibers, namely coir, banana, and sisal fibers, using γ-methacryloxypropyltrimethoxysilane (MEMO), y-aminopropyltriethoxysilane (AMEO), sodium alginate (NaAl), and sodium hydroxide (NaOH) solutions. The cleaned, washed, and dried fibers were di…
Bonding of nitride ceramics (Si3N4 and AlN) to metals was carried out in a vacuum of about 6 mPa using Cu-base active filler metals. Reaction layers existed at the interfaces between Si3N4 or AlN and insert layers, and Cu enriched layers were found in the bonding layers. Reaction layers in Si3N4 to W joints were compo…
Isolation of actinomycetes is an indispensable step in the screening programs of industrially useful strains as well as in the ecological study of microorganisms. During the past 10 years, the author and his co-workers have studied the selective isolation methods of soil actinomycetes. A new medium and a variety of ne…
Spectres de reflectance diffuse de smectites dans le proche infrarouge en relation avec la composition chimique. — Les spectres-de réflectance haute résolution de 12 smectites sélectionnées ont été réalisés dans le domaine du proche infrarouge (1,0 à 2,5 μm). Les teneurs en Al, Mg, Fe et Si de ces minéraux ont été dét…
処理条件によって多様に変化するポリアニリソの分子構造を分光学的に追跡し,四つの基本的分子構造～ イミノフェニレン構造(IP),そのドープされた状態(IP+),酸処理によって生成するアソモニウム塩構造およびキノノイド構造(NP)を同定し,ポリアニリンの分子構造として通念化していたエメラルディン構造[(IP)m-(NP)m-]はポリアニリンの分子形態の一つに過ぎず,適正な処理で極限的な還元処理を行うことにより完全な連鎖構造の白色のポリ(イミノフェニレン)の調製が可能である事を示した。このような知見に基づきy実質的にIP構造から成るポリアニリンとステンレススチールの集電体とが一体化した形態の電極材を電気化学的に作製しfこれを正極としたリ…