Materials Literature
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The pyrolysis kinetics of cellulosic uncoated printing and writing paper, which is one of the principal materials contributing to the municipal solid waste (MSW) of Taiwan, was investigated with a thermal gravimetric analysis (TGA) reaction system. The experiments were carried out in a nitrogen environment in the 450–…
The metal-catalyzed Baeyer-Villiger oxidation of cyclohexanone with molecular oxygen (latm) in the presence of benzaldehyde gives δ -caprolactone in high yield. The same oxidation in the absence of metal catalysts is also studied. Additives to the system can improve the reaction highly efficiently.
The synthesis of the 3-pyrrylacetic acid as well as the study of its esterification conditions are described. The new materials thus obtained are electropolymerized.
Chloride (Cl-)-induced pitting corrosion of iron at pH 10.5 and 25°C was examined by conducting quasi-steady-state (potentiostatic) polarization experiments in borate-buffered 0.1 M sodium chloride (NaCl) solutions with buffer concentrations from 0 M to 0.075 M. Values of the film breakdown potential (Eb) were scatter…
The structure of hexamagnesium sulfonyl tetradecahydroxide, Mg 6 SO 2 (OH) 14 , has been determined with an extremely small single-crystal ( ca 0.5 × 100 × 2.5 μ m) using synchrotron radiation [1.00 (1) Å]. The crystal is orthorhombic with space group Ccmm (No. 63), a = 15.895 (1), b = 3.105 (1), c = 13.367 (1) Å, V =…
H. Ray Gamble, Raymond H. Fetterer, Linda S. Mansfield, Developmentally Regulated Zinc Metalloproteinases from Third- and Fourth-Stage Larvae of the Ovine Nematode Haemonchus contortus, The Journal of Parasitology, Vol. 82, No. 2 (Apr., 1996), pp. 197-202
Abstract Ring oxidized green Cerium(IV)diphthalocyanines, [Ce(Pc) 2 ]X (X = (poly)halide, NO 3 - ) are prepared by chemical oxidation of ( n Bu 4 N)[Ce(Pc 2- ) 2 ] with the corresponding halogen in solution or of solid [Ce(Pc 2- ) 2 ] with aqueous HNO 3 Electrochemical oxidation of (nBu 4 N)[Ce(Pc 2- ) 2 ] in solution…
Nickel sulflde powders were precipitated by utilizing the thermal decomposition of thioacetamide in acidic aqueous solutions. Precipitation was induced by a direct reaction between thioacetamide and nickel at 70° and 80°C with thioacetamide concentrations of 0.80 M . Precipitation was induced by reaction of sulfide io…
A new type of nearly homeotropically aligned four-domain liquid crystal display has been developed using nematic liquid crystals with negative dielectric anisotropy. In this display a pixel is divided into four domains which have different and optically compensating molecular alignment properties. This molecular arran…
The crystal structure of vanadocene, bis(π 5 –2,4-cyclopentadien-1-yl)vanadium, Cp 2 V, has been studied at the four temperatures 108, 170, 297 and 357 K by X-ray diffraction in order to elucidate the nature of the Cp-ring disorder and compare the results obtained with similar data for formally isostructural ferrocene…
We have investigated the recently reported discrepancy between theory and a new experiment [Palathingal et al., Phys. Rev. A 51, 2122 (1995)] for single-quantum annihilation of positrons with bound electrons. Fully relativistic calculations of total cross sections for the production and the annihilation of positrons i…
Mussels form byssal threads that can attach tenaciously to wet and irregular surfaces. The byssus consists of a fibrous collagenous core, and at least two types of polyphenolic proteins surround it. One of these proteins, designated Mgfp-1, coats the collagenous core; the other, designated Mgfp-2, is the major compone…
The use of modular neural network (MNN) for the recognition of partial discharge (PD) sources has been investigated. Three phase related quantities, the PD pulse counts, the average and maximum discharge magnitudes form the feature vector of a discharge signal. The MNN consists of 5 sub-networks with identical structu…
Electrical and thermal analysis of a 15 kV silicone rubber distribution insulator was made under contaminated surface conditions. The electric field on the insulator surface and in the surrounding area was determined by using the finite element method technique, while the temperature distribution along the insulator s…
Several derivatives of 2,3-dicyanopyrazine were prepared via the condensation of o-quinones with diaminomaleodinitrile. Benzo[f]quinoxaline-2,3-dinitrile was obtained from 1,2-naphthoquinone, and a series of isomeric, di-tert-butyl substituted 5,6-(9,10-phenanthro)-2,3-dicyanopyrazines were prepared from the correspon…
Starting from the Maxwell equations, we solve the problem of the diffraction of a plane wave by a grating of finite conductivity, assuming that the incident wave vector is not orthogonal to the grooves. We make use of the method of fictitious sources, and the diffraction problem is thus reduced to two canonical proble…
The problem of pollutant transfer in food from a polymer packaging made of a recycled film and a functional barrier is studied from a theoretical point of view. In the present case, the process is controlled by Fickian diffusion through the two films of the polymer packaging in perfect contact and by convection into t…
The Effects of non-ideal and nonhomogeneous mixing on barium sulfate precipitation in an MSMPR reactor were observed experimentally and analyzed theoretically. To generate nonhomogeneous mixing the unmixed feed streams were fed to the reactor at the same location (joint feeding mode) or a plug flow reactor was connect…
The magnetizations, magnetic susceptibilities, and specific heats of both stoichiometric and nonstoichiometric single crystals GdAs are measured at temperatures 1.7\ensuremath{\le}T\ensuremath{\le}300 K and magnetic fields 0\ensuremath{\le}H\ensuremath{\le}24 T. A systematic comparison between the magnetic behavior of…
${\mathrm{Tm}}^{3+}$ doped germanate, tellurite and heavy-metal fluoride glasses were prepared and their upconversion luminescence spectra were measured to investigate the effect of the host glass on the branching ratios, \ensuremath{\beta} of $^{1}$${\mathit{D}}_{2}$${\ensuremath{\rightarrow}}^{3}$${\mathit{H}}_{6}$…