Materials Literature
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This paper clarifies two matters, the source of equation of Ω and the nature of current vector T, of T-Ω method in magnetostatic field analysis. First, we derive a new formula including T0 (T0 obtained from exciting current density Js is expressed as T0) from the Biot-Savart formula by dyadic operator. From this new f…
Abstract Some sulfur concretes have been shown to expand excessively under moist conditions. The deterioration is accompanied by a decrease in dynamic modulus of elasticity with time. The durability of sulfur concretes containing glycerin and crude oil admixtures was slightly improved, but expansions were still unacce…
It is well known that segregation of Ti and formation of TiN occurs when active brazing alloys such as Ag-Cu-Ti were used for Si3N4 joining. Si3N4-Si3N4 joining was carried out using several glass solders containing oxides of active metal, 1A group elements and 2A group elements without applying pressure. Si3N4-glass…
The X-ray diffraction (XRD) and scanning electron microscopy (SEM) study was carri-ed out for an amorphous Cu+ conductor 0.4CuI-0.3 Cu2O-0.3P2O5 with the simultaneous conductivity measurement in the isothermal heat treament process. The results indicated that the initial amorphous material was phase-separated. In the…
By using carbide nucleation-heat-treated SUS304 stainless steel specimens, the effect of various type of stresses applied during 500°C isothermal heat treatment on Low Temperature Sensitization (LTS) was examined. The Degree of Sensitization (DOS) was detected by means of the Electrochemical Potentionkinetic Reactivat…
In this paper, with the assuption of effective lattice mode of coupling, a generalized theoretical expression of multiphonon relaxation rate has been derived by using quantum mechanical generating function method. An analytical rate expression is presented for high-order approximation case. Limitations of relaxation r…
Additive elements (Pb, Fe, Ni, Al, Mg,...) included in galvanizing baths are studied, according to atmospheric corrosion resistance of the zinc coating. Various agressive media are involved with different pH values, chloride and carbonate contents. For chloride and acidic conditions, presence of Al or Mg induces local…
High chemically durable porous glasses containing Na2O, Al2O3, ZrO2 and SnO2 up to about 10wt% were obtained by using immiscible SiO2-B2O3-RO glass systems as the base glass. It was found that the amounts of Al2O3, ZrO2 and SnO2 in porous glasses increased with increasing heating temperature. Alkali resistance of thes…
Fission cross section ratios of 240Pu and 242Pu relative to 235U were measured by using the 4.5 MV Dynamitron accelerator of Tohoku University. The measurement using mono-energetic neutrons was performed in the neutron energy range of 0.6–7 MeV with the time-of-flight method. Prior to the measurement, a fast timing ba…
The diffusivities of O2 molecules in amorphous SiO2 thin films were determined over the temperature range of 1073 to 1273 K by means of the thermal oxidation of Si substrates. The SiO2 films were synthesized on Si substrates with the four different methods, i.e., thermal oxidation, sputtering, chemical vapor depositio…
Alumina short fiber and carbon short fiber reinforced aluminum composites were fabricated by squeeze casting. Tensile and sliding tests and metallography of the composites were carried out. It was revealed that hybrid fiber composites of alumina and carbon fibers had good sliding properties, especially under dry condi…
We have proposed a general formula of electron inelastic mean free path (IMFP) to describe the calculated IMFPs over the 50-2000 eV energy range based on the Inokuti's modified Bethe formula for the inelastic scattering cross sec-tion. The IMFPs for 50-2000 eV electrons in 27 elements were calculated using Penn's algo…
This paper deals with the formation of grain boundaries during plastic deformation of pure magnesium, a matrix type magnesium alloy (Mg-6Zn-0.65Zr), and the two-phase Mg-8.1Li-4.2Al alloy. It is shown that the main process responsible for the generation of recrystallized grains is the formation of subgrains under smal…
The triply incommensurate phase in 2H–TaSe2, which exists between 112 and about 85 K on cooling, has been investigated by means of electron microscopy. The high resolution micrographs clearly show that the incommensurate phase between 112 and 92 K is an intrinsic incommensurate phase without orthorhombic domains of th…
In the past ten to fifteen years, considerable research has been conducted on the use of both organic and inorganic fibrous catalyst supports. Much work has been done recently on the immobilization of enzymes by porous solid fibers and by hollow fibers. Fibrous supports have the advantage over conventional supports su…
Over 120 organic compounds have been investigated as potential corrosion inhibitors for mild steel in simulated engine coolants. A relationship has been found between the corrosion potential (Ecorr) and inhibitor performance (Rp). With straight chain alkyl carboxylates, maximum inhibition was found for C6- C10 monocar…
It is pointed out that the magnetic material for cores of a differential current transformer (DCT) of a ground fault interrupter (GFI) should be characterized by high initial permeability, little dependence on temperature, and a low remanence. These parameters have been taken into consideration during selection of the…
A low temperature dyeing technique that was developed as a characterization method for poly(ethylene terephthalate) (PET) partially oriented yarns revealed thermally activated interactions between the fibers and spin finishes containing pure or close derivatives of poly(ethylene glycol) (PEG) that bring about dye bloc…
Abstract Extender oil bloomed on the surface of ethylene–propylene–diene rubber (EPDM) vulcanizates has been analyzed by a dissolution/size exclusion chromatographic (SEC) method. Dissolution is here defined as the quantitative and selective removal of bloomed extender oil from the vulcanizates. The rate of migration…
This paper summarizes the results of an investigation conducted to characterize tensile and shear response of P100/6061 graphite-aluminum composite in the temperature range -101 to 260°C (-150 to 500°F). The off-axis tension test and losipescu shear test methods were employed to meet this objective. The experimental r…