Materials Literature
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A niobium tungsten bronze crystal with a nominal composition 3 Nb2O5.8WO3 gives circular diffuse scattering in the electron diffraction pattern. The diffuse rings change shape and size when the crystal is reduced at high temperature. The observations are explained by improving the cluster model proposed by De Ridder,…
Abstract A technique is presented for the direct study of water attack at the silane‐filler interface. This technique, Filler Desorption Test (FDT), involves observations of surface tension changes which occur when a silane‐treated filler is floated on a water surface. If all the silane has been appropriately cured to…
Abstract The role of aqueous alkali solutions as swelling agents of cotton cellulose has been studied by various workers and these reagents have been invariably considered to cause lattice disorder in cellulose. The effect of multiple swelling treatments on the cotton cellulose structure has not been studied hitherto.…
The order-disorder ferroelectric transition in HCl and in the mixed crystals HCl-DCl has been studied by means of $^{35}\mathrm{Cl}$ ($I=\frac{3}{2}$) nuclear quadrupole resonance (NQR) pulse Fourier transform measurements. The NQR parameters are related to the static and dynamical quantities involved in the transitio…
Young's modulus and the Delta E effect of Fe-Pd Invar alloys have been investigated. The Delta E effect at room temperature exhibited a similar concentration dependence of the longitudinal linear magnetostriction. The temperature dependence of Young's modulus was analogous to that of Fe-Ni and Fe-Pt Invar alloys, name…
The title compound crystallizes in the orthorhombic system (possible space groups: C2cm, Cmcm and Cmc21). The unit-cell data are a = 6.313 (5), b = 16.60 (2), c =7.555 (3) Å. The indexed powder data is given.
Selected area electron diffraction and transmission electron microscopy have been used to characterize the pre-neck deformation mechanisms which operate with increasing strain throughout the volume of ‘two-dimensional’ melt-cast high-density polyethylene spherulites. Comparisons are made between the results and previo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Gas-Phase Catalytic Isomerization of XylenesAvelino Corma and Antonio CortésCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 2, 263–267Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 April 1980http…
The dielectric constant and loss have been monitored isothermally in the frequency plane in the α relaxation region for a series of amorphous compatible and phase separating polymer blends comprising one polar and one relatively non-polar component. Differential scanning calorimetry has been employed for preliminary a…
Alloys, bronze, and the corrosion and protection of copper and bronze.
An electron diffraction technique has been developed to study the thickness of grain boundaries in polycrystalline specimens. Grain boundaries with a periodic structure in Al2O3, Cu-Bi and Au, were examined in an edge-on orientation using electron microscopy and diffraction. Each boundary gave rise to streaks in the d…
Abstract Adsorption of silicic acid on iron(III) hydroxide from aqueous solution and polymerization of adsorbed silicic acid were affected by pH, concentration of silicic acid before and after adsorption, or the relative amount of silicic acid and iron(III) hydroxide. The amount of adsorbed silicic acid and the rate o…
Hexa(p-lithiophenoxycyclotriphosphazene) has been synthesized as an intermediate for the covalent attachment of metallo-, phosphino, carboxylato, alkyl, or tertiary alcohol units to the side group structure. These reactions are models for the preparation of the corresponding phosphazene high polymers.
Abstract Actinoplanes missouriensis produces an intracellular soluble glucose Isomerase. The soluble enzyme can be purified by a DEAE‐cellulose beads columm with a onestep salt elution. The purified enyzme exhibited a molecular weight of approximately 80,000 daltons, being composed of two identical subunits of about 4…
SUMMARY Inner shell ionization edges in the energy‐loss spectrum were used to measure the loss of gaseous elements from thin samples of nitrocellulose, polyvinyl formal, copper phthalocyanine, graphite bisulphate and sodium chloride during exposure to 80 keV electrons. The irradiation kinetics were measured for electr…
In order to get the maximum output from oxide-semiconductor/base-semiconductor solar cell, one has to incorporate an ultrathin insulating layer so that the resulting configuration is a semiconductor-insulator-semiconductor (SIS) diode. The performance of such SIS diodes is equivalent to a metal-insulator-semiconductor…
Samples of general-purpose polystyrene and poly(methyl methacrylate) were melt blended in a special mixer–extruder over the complete range of compositions from 100% polystyrene to 100% poly(methyl methacrylate). The blends were characterized for their melt rheological characteristics in a melt elasticity tester which…
Dose-rate conversion factors for external exposure to photon and electron radiation are calculated for 240 radionuclides of potential importance in routine releases from nuclear fuel cycle facilities. Exposure modes considered are immersion in contaminated air, immersion in contaminated water, and irradiation from a c…
Uridine diphosphoglucose 4-epimerase (EC 5.1.3.2) of Saccharomyces cerevisiae was purified to homogeneity with a yield of 30%. The purification procedure involved ammonium sulfate precipitation, streptomycin treatment, chromatography on diethylaminoethyl cellulose and hydroxylapatite, and Bio-Gel A-0.5m gel filtration…
Paramagnetic centres are produced in vitreous (v)-SiO2 by the trapping of photogenerated electrons and holes at the intrinsic bonding defect centres associated with over- and under-coordinated oxygen atoms, C3 + and C1- respectively. Capture of a hole by the C1- converts that centre to C1 0, the oxygen hole centre (OH…