Materials Literature
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The linearized shape stability of melting and solidifying fronts with surface tension is discussed in this paper by using asymptotic analysis. We show that the melting problem is always linearly stable regardless of the presence of surface tension, and that the solidification problem is linearly unstable without surfa…
Abstract The tensile drawing of polyethylene terephthalate fibers spun from polymer of high and low molecular weight over a range of windup speeds has been studied. An analysis of the mechanical properties, orientation, and shrinkage behavior for different draw ratios leads to two conclusions. First, the network struc…
Resonance polarization-sensitive coherent anti-Stokes Raman scattering (PS CARS) spectra of the electronic ground state and excited singlet S 1 state of rhodamine 6G in ethanol were obtained with the use of the pump-probe technique with nanosecond time resolution. Variation of the polarization orientation of the pump…
Abstract Caryinite from Långban, Sweden is associated with barite, richterite, manganberzeliite, hedyphane, sarkinite or eveite, and an exsolved fermorite-like mineral. The crystal structure of caryinite, space group I2/a, a 6.855(2), b 13.147(3), c 11.479 (4) Å, β 98.97°, V 1022.0(5) Å 3 , has been refined to a conve…
Molecular oxygen or cytochrome c has been described as the electron acceptor of the reaction of old yellow enzyme with NADPH. In this study, menadione was found to be a sensitive electron acceptor of the reaction under aerobic as well as anaerobic conditions. The Km value of menadione for old yellow enzyme is as low a…
Abstract The rate of aerial oxidation of the title porphyrin ( 1 ) in dichloromethane (DCM), acidified with trifluoro‐acetic acid (TFA), was found to be first‐order in 1 and second‐order in TFA at low TFA concentrations, and second‐order in both 1 and TFA at higher TFA concentrations. At the lower TFA concentrations,…
The emission spectra of KBr and KCl were obtained in the temperature range 18--290 K during the thermoluminescence (TL) measurements and 40--300 K during the cathodoluminescence (CL) measurements. The 400--600 nm broad emission bands in KBr and KCl at low temperatures are resolved into at least two components: the sel…
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Summary Differential scanning calorimetry (DSC) was used to evaluate the effects of marination on the thermal transition temperature of connective tissues from spent hen drumsticks. Samples were heated in the calorimeter from 20 to 90°C at 10°C min 1 . Collagen of untreated epimysium, tendon and skin exhibited denatur…
A diaphragm-type pressure transducer with a sputtered platinum film strain gauge (sensing film) has been designed and fabricated. The various steps followed to prepare thin film strain gauges on the diaphragm are described. M-bond 450 adhesive (Measurements Group, USA) has been employed as the insulating layer. A deta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble isomerization polymerization of 2-amino-2-oxazolines having four- to eight-membered cyclic imino substituentsMasatoshi Miyamoto, Masakazu Shimakura, Koji Tsutsui, Kiyoshi Hasegawa, Keigo Aoi, Seiji Yamaga, and Takeo SaegusaCite this: Macromolecules 1993, 26, 26, 7116–…
We first consider the effects of the crystal field on both the 4f ground state and the 5d excited state of a ${\mathrm{Ce}}^{3+}$ ion in the paramagnetic medium ${\mathrm{CeF}}_{3}$, and further take account of the splitting of the crystal-field ground-state levels caused by the effective superexchange field ${\mathit…
Galvanostatic measurements, intermittent titration experiments, and x‐ray diffraction analysis indicate that the cathode reaction mechanism in a nonaqueous secondary battery is an intercalation process. The measurements also yielded kinetic parameters such as the chemical diffusion coefficient and mobility of Zn in as…
Abstract.- Depth-sensing submicron indentation testing was used to measure the elastic-plastic behavior of sintered chromia and oxide scales formed on pure chromium in air. The use of top-down indentations limited the amount and precision of the scale data due to surface roughness and substrate effects. Nevertheless,…
Abstract Polyphosphate esters were synthesized from derivatives of cardanol phosphorodichloridateates and dihydric phenols by interfacial polycondensation using a phase transfer catalyst. The polymers were characterized by IR, 1 H‐, 13 C‐, and 31 P‐NMR spectroscopy, and GPC. The thermal stability and thermal degradati…
Photochemical degradation of natural rubber (NR) yield amine-terminated liquid natural rubber (ATNR) when carried out in solution in presence of ethylene diamine. The ATNR on reaction with glyoxal yielded polyschiffs base. This polyschiff's base was found to improve the ageing resistance of natural rubber.
Abstract This investigation extends our previous investigations of liquid crystalline polyurethanes prepared from 4,4′‐bis(2‐hydroxyethoxy)biphenyl (BHBP), 2,4‐tolylene diisocyanate, and poly(oxytetramethylene)diols as the flexible spacers. The influence of molecular weight of investigated polyurethanes on their prope…
Multiband Hubbard and Pariser-Parr-Pople calculations have been carried out on mixed donor-acceptor (DA) stacks with doubly degenerate acceptor orbitals and nondegenerate donor orbitals at two-thirds filling. Model exact results for 2, 3, and 4 DA units show that McConnell's prediction of high-spin ground states in th…
We present computer simulation results of a solution of multiblock copolymers, and show that a network can form under certain conditions. This network formation is due to a bridging effect, which exists for multiblock but not for diblock copolymers. Because of this special property, we suggest that multiblock copolyme…
The Deposition by Aqueous Acetate Solution (DAAS) technique has been developed for the preparation of thin films of Pb(Zr0.53Ti0.47)O3[PZT(53,47)] perovskites. This process, which employs titanium acetate, tends to establish a chemically bound network in the pre-annealed phase and facilitates the crystallization of fe…