Materials Literature
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The orientation distribution of crystallites has until now been interpreted by a small number of texture components. In the frame of the harmonic formalism, an analytical method for the accurate determination of the volume fractions of peak-type components in restricted regions is developed without recourse to additio…
In this article, the kinetics of crystallization for semi-crystalline polymers has been successfully incorporated into a cavity flow simulation. The flow resistance, in terms of filling pressure, can be significantly underestimated if crystallization is neglected during the calculation. In addition, the filling behavi…
This dissertation describes the interaction of bubbles generated by underwater electrical discharges. The oscillations of these high temperature vapor and plasma bubbles generate acoustic signatures similar to the signatures generated by air guns, underwater explosions, and combustible sources. Tasks performed by thes…
Dielectric and birefringent properties of [N(C2H5)4] 2 Z B r 4 and [N(C2H5)4]2CdBr4 crystals were investigated. It has been ascertained that two phase transitions manifest themselves in the temperature dependencies ( T ) f o r [ N ( C 2 H 5 ) 4 ] 2 C d B r 4 c r y s t a l -a s e c o n d -o r d e r t r a n s i t i o n…
In August 1992, the World Checkers Champion, Dr. Marion Tinsley, defended his title against the computer program Chinook. Through its success in human tournaments, Chinook had earned the right to play for the World Championship. Dr. Tinsley won the b
ABSTRACT A clonal isolate of Chrysodidymus synuroideus Prowse was derived form a Sphagnum bog in northern Wisconsin and maintained in culture for over 3 years. Cultured colonies consisted almost exclusively of two cells attached at the posterior, each cell bearing two unequal flagella. Correlative light and electron m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethods to increase the efficiency of a metallic monolithic catalystS. Lennart Andersson and Nils Herman SchoeoenCite this: Ind. Eng. Chem. Res. 1993, 32, 6, 1081–1086Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June…
Abstract Thermoluminescence (TL) studies of insulators, including crystals of minerals such as calcite, quartz or zircon, have resulted in the development of a wider range of applications in the fields of radiation dosimetry and archaeological and geological dating. Most conventional TL measurements are made by record…
Abstract With the ever increasing demand for better performing products has come the enhanced use of stabilizers and stabilizer systems in both the production and processing of poly(vinylchloride). Antioxidants and chain terminators are commonly used in teh resin manufacturing to improve the initial color and overall…
Abstract Mica domains have received less attention in the literature than smectite quasi-crystals. This study was conducted to determine whether mica crystals form domains in suspension, the conditions in which those domains exist, and the distribution of adsorbed Na and Ca ions in the domains. Particle size distribut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleA new vanadium(V) persulfide complex: (NEt4)[VO(S2)2(bpy)]Stephanie L. Castro, James D. Martin, and George ChristouCite this: Inorg. Chem. 1993, 32, 13, 2978–2980Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https…
Abstract SEM investigation of polyaniline (PAni) layers showed that it is composed of around 10 nm small primary particles. This is in accordance with other earlier results.
Abstract In Moroccan calcareous mountains, red soils are distinguishable from brown soils, not only by their colour but also by their microaggregated structure. Clay mineral dispersion studies of these soils were carried out by increasing pH, after different treatments. The formation of the pseudo-particles appears to…
Abstract Several derivatives of 2‐mercaptopyrimidine (containing ‐OH, ‐SH, ‐NH 2 or ‐CH 3 substituents) have been studied as corrosion inhibitors of ARMCO iron and low alloy steels in 1 M sulphuric acid solutions. Tests have been conducted during 6 h in the temperature interval between 60 and 90°C. The trends of the c…
Abstract The surface tension of viscous polymer liquids, viz. polysiloxanes having fluorinated alkyl sidechains, was evaluated based on the pendant‐drop method. The polysiloxane fluids studied are poly‐(3,3,3‐trifluoropropylmethylsiloxane), poly(3,3,4,4,5,5,6,6,6‐nonafluorohexylmethylsiloxane) (PNFHMS), poly(3,3,4,4,5…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDissociation and recombination dynamics of the complexes [(.eta.5-C5R5)Cr(CO)3]2 (R = hydrogen, methyl)Qin Yao, Andreja Bakac, and James H. EspensonCite this: Organometallics 1993, 12, 6, 2010–2012Publication Date (Print):June 1, 1993Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility in blends of model polyolefins and corresponding diblock copolymers: thermal analysis studiesD. J. Lohse, L. J. Fetters, M. J. Doyle, H. C. Wang, and C. KowCite this: Macromolecules 1993, 26, 13, 3444–3447Publication Date (Print):June 1, 1993Publication History P…
The mechanism for grain growth of β‐SiAlON has been investigated by annealing high‐density β‐SiAlON–YAG materials at 1650°C. An observed decrease in grain growth with increasing weight fraction of liquid confirms a diffusion‐controlled growth mechanism in the system. The grain‐growth mechanism is further characterized…
We report the synthesis, characterization and structural studies of the higher homologues of N(4-n-pentyloxybenzylidene)4-n-alkylaniline compounds, viz. 5O.12, 5O.14 and 5O.16 by thermal microscopy, differential scanning calorimetry and X-ray diffraction. The compounds exhibit N–SA–SB, N–SA–SB and N–SA phase sequence…
Saccharide materials are potential candidates for frequency conversion applications. In addition to being chiral, which ensures crystallization in a space group necessary for three-wave mixing processes, they generally possess useful physical and optical properties. We have examined the powder second harmonic generati…