Materials Literature
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We have measured the effect of pressure on the solid phase epitaxial growth rate of Ge(100) into self-implanted amorphous Ge by using in situ time-resolved infrared interferometry in a high-temperature, high-pressure diamond anvil cell. In the temperature range 300–365 °C, a rate enhancement of more than a factor of 1…
We have imaged for the first time the atomic structure of a quasicrystal using a scanning tunneling microscope. The structure of the decagonal ${\mathrm{Al}}_{65}$${\mathrm{Co}}_{20}$${\mathrm{Cu}}_{15}$ quasicrystal is described by a pentagon-center-decorated pentagonal quasilattice giving strong evidence for a tilin…
In shape-memory alloys a first-order martensitic phase transition is responsible for pseudo-elastic and for ferro-elastic stress-strain relations. To describe this behaviour a modified Landau theory is proposed in which the free energy of the crystal depends on the temperature and on the full strain tensor. The energy…
Abstract Effects of E / P ratio of the EPDM rubber on the flow behavior and morphology of the crosslinkable polyethylene and EPDM blends have been studied as a function of shear rate and processing temperature. High‐ E / P ‐ratio EPDM rubber exhibits high viscosities within the temperature range studied but the extrud…
Abstract New thermoplastic elastomers (TPEs) consisting of a central rubbery polyisobutylene (PIB) and glassy outer cyclopolyisoprene (cy‐PIP) segments have been prepared by living carbocationic polymerization by sequential monomer addition. First the homopolymerization of isobutylene (IB) and isoprene (IP) have been…
Abstract Polylactide (PLA)‐poly(ethylene glycol) (PEG) copolymers were synthesized from polyethylene glycol and D , L ‐lactide using low toxic stannous octoate as catalyst at 180°C by bulk polymerization. The copolymers were characterized by GPC, IR, and 13 C‐NMR. A full assignment NMR spectrum is presented. The physi…
The characteristics of Forbush decreases of cosmic ray caused by solar flares in March 1989 are analysed in this paper. The anisotropy for μ-meson component are also analysed beside neutron component, and the relationship between the cosmic ray intensity variation and the characteristics of solar flares and geomagneti…
This paper deals with the ion wind of SF6 gas which is generated by partial discharges at a tip of a needle electrode at dc fields. The velocity measurements of the ion wind are performed by a hot wire annemometer, using a needle(φ0.2, length 10) -plate(φ120) set in compressed SF6 gas (3_??_5 atm). The velocity of the…
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…