Materials Literature
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Abstract Shear band localizations are studied using a band model involving two polycrystalline aggregates; one representing the material inside the potential band and the other the material outside. Each of these aggregates is assumed to be homogeneously deformed and conditions of compatibility and equilibrium are enf…
We study the entropy of dimers on a semi-infinite M*N square lattice (N to infinity ) with lattice interaction energy per dimer mu 1 and nearest-neighbour interaction energy mu 2 . Numerical computations based on recursive transfer matrices show that for M=1, 2, 3, 4 and 5, and under certain conditions, the constant-…
For each of the compounds MnTi 2 , FeTi 2 , CoTi 2 , NiTi 2 , PdTi 2 , PtTi 2 and CuTi 2 , the differences between the total energies of the compounds in the MoPt 2 -, MoSi 2 - and NiTi 2 -type crystal structures are calculated. Trends of structural energy differences are analysed by performing 'frozen-potential' ener…
We report the first direct measurements of spin/orbital magnetization ratios in a ferromagnetic material using X-ray diffraction. The simple technique, based on diffraction of elliptically polarized white synchrotron radiation, produces spin/orbital ratios that are independent of the precise photon polarization. Resul…
A one-dimensional microhole array with high-aspect ratio was successfully obtained using anodic oxidation of an aluminum oxide/aluminum/glass structure. This process allows the fabrication of an array of microholes less than 1000 Å diameter without any exposure mask or resist, and the size of the array can be controll…
The growth behavior of diamond films synthesized from halomethane reactants is studied in a hot-filament chemical vapor deposition reactor. The growth characteristics of methane and several chloromethane reactants (CH2Cl2, CHCl3, and CCl4) are examined over a number of reactant concentrations, substrate temperatures (…
We have measured the thermal conductivity κ of single crystals of hexagonal silicon carbide (6H-SiC) of two different electron densities n. The densities are low such that virtually all of the heat is conducted by lattice vibrations. At low temperatures the thermal conductivity of both samples varies as T2 and scales…
An O(N) and rapidly convergent method for calculating the bond order potential and forces for the atomistic simulation of covalent systems is described. A derivation of a novel many-atom expansion, which allows the Green's functions, not only to handle the symmetry problem correctly but also to retrieve equivalence be…
Currently, the materials with the highest thermoelectric figure of merit (ZT) are one-band materials. The presence of both electrons and holes lowers ZT, so two-band materials such as semimetals are not useful thermoelectric materials. However, by preparing these materials in the form of two-dimensional quantum-well s…
As meta1-air batteries have high energy(lensities they are attractive as a power source of electric vehicles1)Howeverone has to overcome various difnculties to realize practical batteries of this type
Abstract Oxidation induction time (OIT), as measured by differential scanning calorimetry, is useful in assessing the extent of degradation in polymeric materials. Values of OIT for typical EPR and XLPE polymer insulation materials used for electric cable insulation in nuclear power plants were measured as a function…
Abstract A kinetic model has been developed on the basis of reaction mechanisms proposed for the anhydride curing of diepoxides, using tertiary amine as catalyst. The model has been tested for the cure reaction of a diglycidylester model compound, bis‐(2,3‐epoxypropyl)‐1,3‐benzenedicarboxylate, with hexahydrophthalic…
Abstract In order to introduce carboxylic acid groups at the surface of poly(ethylene) (PE) films, an attempt was made to covalently link a preadsorbed layer of poly(acrylic acid) (PAAc) on a PE film by an argon or tetrafluoromethane (CF 4 ) plasma treatment. Surface analysis was performed by XPS (X‐ray photoelectron…
Abstract The structural changes and the thermal behavior of silk fibers grafted with methacrylamide (MAA) were investigated as a function of the weight gain. The refractive index parallel to the fiber axis decreased with increasing weight gain, whereas that perpendicular remained almost unchanged. Accordingly, birefri…
LithiumseftiQn characteristics of a ODmplex oxide containing V(V)Cu2V207weinvestigatedLithium illseion was caed outchemicay ushlg anBuLihexie solution and also by the electrochemical GnT method comparativelyThe valence states of copper or vanadium and the stfucturalchImges by lithium insertionwere analyzedbyESRmdXRDme…
The lithium surface immersed in tetrahydrofuran(THF)containing various salts was analyzed by X-ray Photoelectron SpectroscopyThe lithium surface was covered with the native film which consists of Li2CO3 Li20and LiOHDuring the immersion of lithium in the LiBF40r LiClO4rHF eltrolytesthe chemical compositions of the nati…
Abstract Novel fluorinated methacrylate polymers were synthesized. The purpose was to produce polymers with low refractive indices and increased resistance to optical radiation damage. Six different fluorinated substituents were appended on the monomer before polymerization. Optical‐quality samples were prepared, and…
Abstract The uncatalysed and catalysed polymerization of a hydroxyl‐terminated polybutadiene with toluene diisocyanate has been studied in toluene solution at four different temperatures. The rate constants ( k 1 , k 2 ) and the activation parameters ( Ea 1 , Ea 2 , Δ S 1 ‡ , Δ S 2 ‡ ) for the isocyanate groups in the…
Abstract Using a commercial epoxy/carbon fiber prepreg as a model system, cure kinetics of an autocatalytic‐type reaction were analyzed by a general form of conversion‐dependent function first proposed for degradation kinetics of polymers and composites. The characteristic feature of conversion‐dependent function was…
Abstract 2,2′‐Bis(2‐oxazoline) was used as a chain extender during processing in a twin‐screw extruder with the aim of counteracting degradation phenomena in recycled poly(ethylene terephthalate) (PET). The same experiments were performed on fiber‐grade PET for comparison purposes. Rheological characterization showed…