Materials Literature
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Abstract Pure 4,4′‐bis(2,3‐epoxypropoxy)biphenyl ( 1 ) has been synthesized and its mesophase behaviour has been investigated. 1 forms a monotropic nematic mesophase with a virtual clearing temperature of 109°C. 1 has been cured with 2,4‐diaminotoluene ( 3 ), 4,4′‐diaminobiphenyl ( 4 ), and 4‐aminophenyl 4‐aminobenzoa…
We compared the efficacy and safety of three doses of beraprost sodium, an epoprostenol analogue, with placebo in the treatment of intermittent claudication (Fontaine's stage II). One hundred sixty-four patients were randomized to receive either placebo, 20 micrograms beraprost sodium (BPS60 group), 40 micrograms bera…
The CD spectra of dispersions of DNA, in the form of cholesteric liquid crystalline droplets, in an aqueous continuum have been studied. Calculated curves have been fitted to experimental spectra. The amplitude and the sign of the intense absorption band of the purine and pyrimidine bases vary with the droplet size, t…
Abstract We prepared several types of thick ≈200 μm films of a poly(vinyl chloride)/poly‐(methyl methacrylate) (PVC/PMMA) gradient polymer blend, which contained a widely waried compositional gradient phase, using a dissolution and diffusion method. We discussed the preparation conditions by classifying those gradient…
Highly textured silicon carbide was fabricated via anisotropic grain growth. Large, platelike grains were grown from a fine‐grained sintered matrix which had been seeded with ≤2% SiC platelets. The seeds were initially incorporated with preferred orientation during the green‐state forming process and this resulted in…
The repassivation characteristics of a titanium thin film evaporated from a high‐purity Ti source as well as selected α (commercially pure Ti, Ti‐5Al‐2.5Sn), β, and β + α titanium alloys (Ti‐15Mo‐3Nb‐3Al, Ti‐15V‐3Cr‐3Al‐3Sn, and Ti‐3Al‐8V‐6Cr‐4Zr‐4Mo) were examined. Both the rapid thin film fracture and scratch depass…
The complex dielectric response was studied for various compositions in the $({\mathrm{Pb}}_{1\ensuremath{-}\frac{3}{2y}}{\mathrm{La}}_{y})({\mathrm{Zr}}_{0.65}{\mathrm{Ti}}_{0.35}){\mathrm{O}}_{3}(\mathrm{PLZT} \frac{y}{\frac{65}{35}})$ crystalline solution as a function of ac drive amplitude, frequency, and temperat…
Indium oxide thin films have been prepared by thermal oxidation of vacuum-deposited indium thin films in air in an open furnace at about 600 K. These indium oxide thin films prepared by thermal oxidation have been examined for optical transparency by measuring their optical absorbance as a function of wavelength. From…
We present detailed measurements of the field and temperature dependence of the resistivity and magnetization of Ce(${\mathrm{Fe}}_{0.93}$${\mathrm{Ru}}_{0.07}$${)}_{2}$. This system undergoes a ferromagnetic to antiferromagnetic transition near 115 K in zero field; applied fields suppress the temperature at which thi…
Visible light emission from Si+ implanted SiO2 layers as a function of different annealing conditions (temperature, time and ambient) is studied. It is shown that a 560 nm band, present in as implanted samples, increases its intensity for increasing annealing temperatures and is still observed after annealing at 1000…
First order reaction kinetics have been accurately fitted to birefringence data taken on polyvinylcinnamate samples during polarized UV exposure. The peak measured value of 0.0136 is about three times smaller than that found in rubbed polymers. However the measured azimuthal anchoring energy (4.2 × 10−6 J m−2) is abou…
The viscoelastic properties of gum rubbers and the properties of corresponding compounds are discussed. Representative examples are given to illustrate the important influence of gum rubber on the compound properties. A method for evaluating strain amplification and strain-rate amplification is proposed. Examples are…
Other| June 01, 1996 Mechanism of the SiO 4 for CO 3 substitution in defernite, Ca 6 (CO 3 ) (sub 1.58) (Si 2 O 7 ) (sub 0.21) (OH) 7 [Cl (sub 0.50) (OH) (sub 0.08) (H 2 O) (sub 0.42) ]; a single-crystal X-ray study at 100 K Thomas Armbruster; Thomas Armbruster Universitaet Bern, Laboratorium fuer chemische und minera…
Abstract Three way catalysts were dispersed over the surface of an anodized Ti wire in order to promptly eliminate hydrocarbons remained in cold-start-exhaust gas from an automobile engine. The anodized wire was heated up to 623 K or higher in 30 sec simply to loading 13 V to the ends of the wire, which resulted is ab…
The determination of thin film thickness by four X-ray reflectivity methods (namely, the peak separation, the Fourier transform, the modified Bragg equation, and the curve-fitting methods) has been studied. An analysis of SrS and BaF 2 thin films showed thickness values determined by the methods agreed to within 4%. T…
During sintering of Al 2 O 3 ‐10ZrO 2 ceramics, cracklike voids were formed due to the differential in densification between agglomerates and the matrix. The small external pressure (2 MPa) applied during presintering at 1200°C prevented the formation of these cracklike voids. The results are explained in relation to…
LethaiaVolume 29, Issue 2 p. 197-202 Comparison of the organic matrix of fossil and recent bivalve shells MICHAEL J. RISK, MICHAEL J. RISK Department of Geology, McMaster University, Hamilton, Ontario, Canada L8S 4M1Search for more papers by this authorBRIAN G. SAYER, BRIAN G. SAYER Department of Chemistry, McMaster U…
Thermoluminescence properties of Li2B4O7 polycrystalline powder undoped and doped with Cu or Eu impurities are investigated. Glow curves of ß irradiated samples are recorded and the dependences of their shapes and of the peak intensities on the dopant concentrations are determined. The results obtained for Li2B4O7:Cu…
Techniques of electron microscopy and specimen preparation of polymers for studying morphology and interfacial layers are briefly reviewed, including a discussion of general problems of electron microscopic investigations of polymers arising from irradiation sensitivity and low contrast. To improve contrast, some irra…
This experiment describes the synthesis of 1,4,8,11-tetraazacyclotetradecane and its nickel(II and III) complexes avoiding the use of percholrate anion. The paramagnetic effects in solution and solid state are described for the nickel(III) dihalo derivatives along with a spectrophotometric study.