Materials Literature
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Experiments performed on the end-edge contacts of polypropylene capacitors to determine whether the thermal effect is the main cause of their degradation are described. Current pulses with different wave-shapes but with the same value of the Joule integral were applied to the contacts, and the degradation levels were…
A new method has been developed for the low-temperature synthesis of perovskite solids LaMO3 where M = Ni, Co, Mn, using binuclear complexes of the ligand N,N′-bis(3-carboxysalicylidene)ethylenediamine (H4fsaen). The thermal decomposition of such complexes was studied using a thermobalance. The solids that formed afte…
Abstract Indices of relative crystallinity of starch samples after gamma irradiation in dry form or in potatoes have been determined by differential and integral methods and compared with those calculated for corresponding reference samples. In the case of dry samples, the diminution of relative crystallinity was obse…
(1991). LIQUID CRYSTAL DISPLAY APPLICATIONS: Past, Present & Future. Liquid Crystals Today: Vol. 1, No. 1, pp. 4-6.
Abstract The starch–iodine blue complex formation does not involve negatively charged iodine species like I , I , or I ; rather, neutral iodine units are involved. The heat of reaction is determined to be about −110 kJ for every mole of I‐I unit in the amylose helix, which suggests that the dissociation of I 2 (bindin…
Infrared spectra were measured of condensates generated by heating polyamide-6, polyamide-12, polyamide-11, polyamide-8 and polyamide-6,6 in inert atmosphere at 300, 350, 400, 500, and 600°C for various time. The products of thermal degradation were characterized by infrared spectroscopy. It was found that the thermal…
Fluoropolymers may be treated with sodium naphthalenide (Na/Naphth) in tetrahydrofuran (THF) so as to increase their ability to form adhesive bonds with other polymers or metals. We describe here a quantitative analysis of the chemical modification which results from such a treatment, using a range of derivatizations…
Copper–cobalt oxysalts of various Cu : Co atomic ratios (100 : 0. 92 : 8, 85 : 15, 77 : 23, 67 : 33, 15 : 85, 0 : 100) have been prepared by coprecipitation, at constant pH, from solutions of copper and cobalt nitrates added to a solution of NaHCO3; the structure and chemical nature of the Cu—Co oxysalts have been inv…
The a-c impedance measurements were made for oxide films formed in high temperature steam on Zry-2 with varying precipitate distributions. TEM and EDX analyses were also carried out on precipitates in oxide films. The electrical resistivity of oxide films tends to increase with an increase in nodular corrosion resista…
Summary The paper is divided into two parts. In Part 1, after a brief historical introduction the advantages and disadvantages of using mineral fillers in the manufacture of paper are summarised. Details of the origin, methods of production and basic physical properties of kaolin, natural calcium carbonate, precipitat…
Recent experiments support a previously proposed model of the location of carbon within the boron carbide structure as a function of carbon concentration. The main features of the model are the presence of carbon within icosahedral units over the entire single phase region, and the progressive replacement of CBC chain…
Abstract Pyrolysis gas chromatographic studies were carried out on two polyphosphate esters of bisphenol A Systematic name: 2,2′‐isopropylidendiphenol. . The gaseous pyrolysis products were found to be mainly phenols and a few phosphate compounds. The identification of phosphorus compounds in the gas phase proves a ga…
Recent studies of self-diffusion and impurity diffusion in α- and β-titanium are reviewed. The transition metal elements and phosphorus exhibit fast diffusion in α-Ti, which are three to five orders of magnitude faster than the self-diffusion. The mechanism of the fast diffusion is discussed on the basis of the severa…
Crystal structure refinement was carried out on a defect spinel with composition Mg 0.388 Al 2.408 O 4 synthesized at 2050°C Combining information from site occupancies and bond distances for tetrahedral and octahedral sites, the following cation and vacancy distribution were obtained: (Al 0.653 Mg 0.347 )(Al 1.755 Mg…
Checa, A. 1991 01 15: Sectorial expansion and shell morphogenesis in molluses. Lethaia. Vol. 24, pp. 97–114. Oslo. ISSN 0024–1164. Any coiled shell can be described as a series of independent helicospirals that join homologous points along the shell surface. The cross-section is therefore seen as a set of points. obta…
The adsorption and the surface reactions of ammonia and nitric oxide on differently pretreated Ru/TiO2 samples have been investigated by means of FTIR spectroscopy. On all the samples, both oxidized and reduced, the ammonia is adsorbed at room temperature in an undissociated form on different Ti4+ surface ions, (at co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism and stereochemistry of .alpha.,.beta.-dihydroxyacid dehydrataseMichael C. Pirrung, Christopher P. Holmes, Daniel M. Horowitz, and David S. NunnCite this: J. Am. Chem. Soc. 1991, 113, 3, 1020–1025Publication Date (Print):January 1, 1991Publication History Published…
The impact of nonlinear loads on anisotropic transformers is investigated. The saturation of the iron-core materials, the anisotropy of the with and cross-grain laminations, the dependency of the iron-core losses on the amplitudes of, the fundamental and harmonics of the flux density, and the dependency of the iron-co…
A number of reviews have been published detailing the chemical and physical properties of silkworm silks 1–6 and the genetics of silk production in the silkworm 7–9 . Here we overview some of the key chemical and physical properties of both silkworm and spider silks, and then review the genetic aspects of silk product…
Development of highly conductive materials with high strength is requisite for conductors of high field magnets. To develop such materials, the Cu-Ag alloys (2-60 at%Ag) and their fabrication methods have been investigated. This paper describes the mechanical and electrical properties as well as the microstructure of…