Materials Literature
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Abstract Heating and cooling were found to affect the structure of carbon fiber polyphenylenesulfide‐matrix composites, as shown by their effects on the DC electrical resistance of the composite in the fiber direction. Matrix flow during first heating above T g and thermal stress buildup during cooling in any thermal…
Abstract Ionic motion and local structure of phenethylammonium ion (C 6 H 5 CH 2 CH 2 NH 3+ ) in a series of phenethylammonium lead(II) halides, [C 6 H 6 CH 2 CH 2 NH 3 ] 2 PbX 4 (X = Cl, Br, I) were studied by means of 13 C cross polarization/magic angle sample spinning (CP/MAS) NMR technique. Among the three salts,…
The transverse crack in thick plate welding is discussed with respect to deposited metal. In recent years, many of the new steel developments such as thermo-mechanical controlled process (TMCP) have been intended to improve weldability. When TMCP steel is used to achieve high strength with lean composition, the weld m…
Photoluminescence (PL) measurements on silicon samples implanted with radioactive Hg isotopes which decay fully or partly through the series Au/Pt/Ir are reported. Results obtained with 193Au isotopes (half-life 17 h) confirm earlier work concerning the involvement of Au in the 735 meV centre first observed in Fe-diff…
Abstract : A constitutive model for ceramics by Johnson and Holmquist has been incorporated and validated in the finite element computer program LS-DYNA2D. Using experimental data acquired at DREV, parameters for high density ceramics (around 98% theoretical maximum density) have been established. The effect of varyin…
A theoretical viscoelastic model based on the four-element Burgers model is devel oped to predict changes in load with time of ISO-301 stitched seams under longitudinal loading subjected to extension/recovery cycling at a constant rate of extension. Param eters calculated from experimental stress relaxation curves are…
Abstract Physical properties of polymers change with time. Exposure of amorphous polymers to high temperature will reduce their free volume, which in turn increases their heat distortion temperature and decreases their impact strength. Heat distortion additives, such as poly(α‐methylstyrene‐styrene‐acrylonitrile) (AMS…
The influence of P, As and Sb on the susceptibility to SCC of α-β′ brasses in different non ammoniated solutions was studied. Two series of brasses were tested: the first one with only 5 – 10% of β′ phase and the second one with 54 – 56% of β′ phase. The VB group elements were present at two different concentrations.…
Abstract We report on the recently developed method for the synthesis, optical, and structural properties of CdSe and CdTe nanocrystals. They were formed in aqueous solutions at moderate temperatures by a wet chemical route in the presence of thiol molecules as effective stabilizing agents. The size‐selective precipit…
The particular role played by the exchange interaction modulated by lattice vibrations (phonons) in effecting spin-lattice relaxation in amorphous materials in conjunction with the spin-orbit coupling, along with the role played by the well-known mechanisms, such as coupling to tunneling level states (TLS) via dipolar…
Abstract The high pressure phase behaviour of four liquid crystals, belonging to the class of laterally aryl‐substituted mesogens has been studied with differential thermal analysis. The pressure dependence of the phase transitions has been determined up to 300 MPa. Transition enthalpies have been determined with the…
Recently, Wingerchuk et al.1 described a patient with brain MRI lesions secondary to embolic metal fragments from a Bjork-Shiley heart valve prosthesis. The incidence and possible clinical symptoms of such lesions are unknown. We present another patient showing similar lesions on MRI who, in addition, had epileptic se…
The polyester in the base fabrics (PET) and the polyvinyl chloride coating (PVC) along with plasticizers and adhesive/glue were separated from a commercial coated fabric by a scheme of chopping, grinding, and extracting with a selected preferred aqueous MEK solution. A novel recovering method called swelling method is…
A systematic study of the electronic structure and chemical bonding of the Li-intercalated titanium dichalcogenides, LiTiX 2 (X=S, Se, and Te), is performed by a first-principles molecular-orbital method using a model cluster composed of 75 atoms. The discrete-variational (DV)-Xα method was employed and Mulliken's pop…
Diblock copolymers of styrene and p-chlorostyrene (PS-b-PpClS) were prepared via chain extension polymerization of N-oxyl-capped polystyrene macroinitiators with p-chlorostyrene. The kinetics plots of the copolymerizations are approximately first order with respect to monomer concentrations. The addition of p-chlorost…
Other| December 01, 1998 Octahedral site Fe (super 2+) quadrupole splitting distributions from the Moessbauer spectra of arrojadite Isamu Shinno; Isamu Shinno Kyushu University, Graduate School of Social and Cultural Study, Fukuoka, Japan Search for other works by this author on: GSW Google Scholar Li Zhe Li Zhe Chine…
The process-parameter-dependent optical and structural properties of MgO-Al(2)O(3)-ZrO(2) ternary mixed-composite material were investigated. Optical properties were derived from spectrophotometric measurements. The surface morphology, grain size distributions, crystallographic phases, and process-dependent material c…
Low-stress mechanical properties of various suiting and shirting fabrics have been studied on Kawabata fabric evaluation system. Sewability of these fabrics has also been studied. The correlations between low-stress mechanical properties and various sewability parameters have been determined for different types of sui…
The preparation of microcapsules containing perphenazine by solvent evaporation using ethyl cellulose is described. The microparticles are formed after solvent evaporation and polymer precipitation. The drug was dissolved in a polymer solution and emulsified into an aqueous phase to form microcapsules. To study the ef…
The time dependent temperature distribution induced by electric current heating in a double edge cracked, unpassivated thin aluminum or gold film interconnect lines is monitored using a high resolution infrared imaging system. A pure aluminum or gold film, with a thickness of 0.2 μm, is deposited by high vacuum evapor…