Synthesis and Polymerization of 2-(3-Pyrrolyl)acetic Acid Derivatives from Pyrrole
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.
Materials Literature
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Pitting Corrosion of Iron in Weakly Alkaline Chloride Solutions
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…
Structure of Mg6SO2(OH)14 determined by micro single-crystal X-ray diffraction
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 =…
Developmentally Regulated Zinc Metalloproteinases from Third- and Fourth-Stage Larvae of the Ovine Nematode Haemonchus contortus
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
Syntheses and Properties of Cerium Diphthalocyanines in High Oxidation States; Crystal Structure of [Ce(Pc)2](BF4) 0.33
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…
Synthesis of Nickel Sulfide by Homogeneous Precipitation from Acidic Solutions of Thioacetamide
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…
Nearly Homeotropically Aligned Four-Domain Liquid Crystal Display with Wide Viewing Angle
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…
Structure of vanadocene in the temperature interval 108–357 K and the nature of the ring disorder
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…
Production or annihilation of positrons with bound electrons
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…
Expression Sites of Two Byssal Protein Genes of Mytilus galloprovincialis
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…
PD classification by a modular neural network based on task decomposition
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 polymer insulator under contaminated surface conditions
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…
Substituted tetra-2,3-pyrazinoporphyrazines. Part I. Angular annelation of tetra-2,3-quinoxalinoporphyrazine
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…
Method of fictitious sources as applied to the electromagnetic diffraction of a plane wave by a grating in conical diffraction mounts
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…
Theoretical treatment of pollutant transfer in a finite volume of food from a polymer packaging made of a recycled film and a functional barrier
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…
MICROMIXING EFFECTS ON BARIUM SULFATE PRECIPITATION IN AN MSMPR REACTOR
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…
Magnetic behavior of stoichiometric and nonstoichiometric GdAs single crystals
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…
Branching ratio of uv and blue upconversions ofTm3+ions in glasses
${\mathrm{Tm}}^{3+}$ 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}$…
Piezoelectric resonance in KAP single crystals
The frequency response of the dielectric constant (∊r), dielectric loss (tanδ) and impedance (Z) of Potassium acid pthalate (KAP) single crystals, monitored along the polar axis, is characterised by the presence of strong mechanical resonances, in the 50-200 kHz region. The observed resonance behaviour, which is depen…
Biodegradable and Tensile Properties of Cotton/Cellulose Acetate Nonwovens
A possible candidate as an environmentally friendly nonwoven fabric is one that can be formed from the thermal calendering of a cotton/cellulose acetate blend. Our results focus on biodegradable properties of the fibers as well as tensile properties of the fabric. Cotton, which is a comfortable, absorbent, biodegradab…