Materials Literature
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Abstract The interest for star‐shaped polymers arises from their unique structure and enhanced segment density. This paper will review the different methods of preparation for star‐shaped polymers. Two cases of special interest will be considered in greater detail: the core‐first method which gives access to end‐funct…
Two ultra-high-temperature materials, hafnium carbide and hafnium diboride, were oxidized in the temperature range 1400 to 2100 C. The two materials oxidized in distinctly different ways. The carbide formed a three-layer system consisting of a layer of residual carbide, a layer of reduced (partially oxidized) hafnium…
The local structure of a Na 2 O─SiO 2 oxide glass and a Na 2 O─iO 2 ─Si 3 N 4 oxynitride glass has been investigated by the pulsed neutron diffraction method. In the oxide glass, the first peak of radial distribution function (RDF) curves appeared at 0.1627 nm corresponding to Si─O boxh length. In the oxynitride glass…
Abstract The permeation and separation characteristics of poly(vinyl chloride) (PVC) and poly[(vinyl chloride)‐ co ‐(vinyl acetate)] (poly(VC‐ co ‐VAc)) membranes were investigated for aqueous organic acid solutions by pervaporation and evapomeation. The PVC membrane preferentially incorporates organic acids and predo…
Abstract Cyclopentanone condensed with phenylhydrazones 5 , or oximes 6 , in the presence of zinc dust, sodium propionate and propionic acid at 150° to give cyclopenta[ b ]pyrroles 7 in good yields. This chemistry was extended to the synthesis of pyrrolic products from 1‐indanone, 2‐indanone and 2‐methylcyclopentanone…
A computation of power transformer parameters with a numerical method using finite elements is presented. The modeling, based on the calculation of the 3-D electromagnetic field, allows a novel approach to the study of the high-frequency phenomena that propagate along the transformer windings. These parameters include…
Increased likelihood of armed forces operations occurring in hostile climatic regions have increased the need for highly specialized protective clothing systems. Protection is needed under a variety of conditions which often present conflicting requirements. Protective military clothing provides broad design possibili…
Abstract Pipes of isotactic polybutene‐1 (PB) have been exposed to internal water and external air in pressure tests at 105°C. The pipes exposed to different internal pressures exhibited different failure mechanisms, referred to as stages I, II, and III. Samples taken from these pipes have been analyzed by infrared (I…
The authors discuss the 3-D electromagnetic modeling of a transformer to evaluate eddy current losses in the tank. To achieve this, several numerical methods are used with two 3-D field computation packages. Conventional volume elements and shell elements are used for the modeling of thin conducting regions. Surface e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInclusion compound formed between poly(.epsilon.-caprolactone) and ureaChristy Choi, D. D. Davis, and A. E. TonelliCite this: Macromolecules 1993, 26, 6, 1468–1470Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 19…
<div class="htmlview paragraph">The development of commercial magnesium die casting alloys has progressed over the past several decades. The most common die casting alloy, AZ91D with 9% aluminum content, has been and still is used in many structural automotive applications.</div> <div class="htmlview pa…
DSC and TGA studies were made of jute fibers treated with a flame retardant formulation, borax-formaldehyde-sodium hydrosulphite. DSC thermograms were ob tained in both nitrogen and air atmospheres and TGA thermograms in nitrogen at mosphere. A thermal analysis was also made of fibers treated with borax alone. A compa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of platinum-gold cluster compounds with dihydrogenT. G. M. M. Kappen, J. J. Bour, P. P. J. Schlebos, A. M. Roelofsen, J. G. M. Van der Linden, J. J. Steggerda, Mark A. Aubart, Donald A. Krogstad, Marcel F. J. Schoondergang, and Louis H. PignoletCite this: Inorg. Che…
Although abrasion-resistant high-chromium cast irons are difficult to machine due to their high hardness and eutectic carbide content, this problem can be reduced by the use of annealing treatments to soften the matrix structures. After machining, the irons can then be hardened by destabilisation, air cooling and temp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray emission analysis of thin poly(3-methylthiophene) and poly{(3-methylthiophene)-co-[1-methyl-3-(pyrrol-1-ylmethyl)pyridinium]} films. Composition, oxidation level, and overoxidationZhigang. Qi and Peter G. PickupCite this: Anal. Chem. 1993, 65, 6, 696–703Publication Dat…
Article Elastomer Interphase in Particle Filled Polypropylene; Structure, Formation and Mechanical Characteristics was published on March 1, 1993 in the journal Journal of Polymer Engineering (volume 12, issue 1-2).
The submerged heater method was used to grow doped InSb and Ge crystals. The axial distribution of the dopants was found to be similar to space grown crystals. The ideal, diffusion-controlled steady-state segregation of Te-doped InSb was achieved for the first time in the terrestrial environment. One Sb-doped Ge singl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism generating switching effects in copper-TCNQ and silver-TCNQ filmsZhongze Gu, Haiming Wu, Yu Wei, and Juzheng LiuCite this: J. Phys. Chem. 1993, 97, 11, 2543–2545Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular copper-barium compounds. Syntheses, crystal structures, and magnetic properties of two sandwich copper-barium complexes: BaCu4(bdmap)4(PyO)4(O2CCF3)2.0.5THF and BaCu4(deae)4(PyO)4(O2CCF3)2 (bdmap = 1,3-bis(dimethylamino)-2-propanolato, PyO = deprotonated 2-hydroxyp…
An efficient numerical technique for the implementation of Preisach-derived models is presented. It is shown that, when efficiently implemented, all Preisach-derived models require only a few table lookups at each field value to compute the magnetization for both locally reversible and irreversible components. In part…