Materials Literature
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In October 1997 Manitoba Hydro experienced the flashover of a FRP hot stick during live line work at 500 kV AC. The paper describes the live line work which was being done, the weather and the condition of the hot stick. A series of tests were made to investigate factors which may have contributed to the flashover. Th…
Abstract Silanols bearing an asymmetric center on silicon, methyl(2-phenylethenyl)(3,3,3-trifluoropropyl)silanol and methyl(phenyl)(vinyl)silanol are synthesized by alkylative cleavages of cyclic siloxanes with an organolithium. Optical resolution of their enantiomers is performed by HPLC with a chiral stationary phas…
Minimization of water use and reuse applications within industry has recently gained importance within the context of water conservation efforts. The leather tanning industry is one of the subject industries due to large amount of water to be disposed of together with a high pollution load. The leather tanning industr…
The effects of palm oil fatty acid concentration (0, 1, 3, 5, 7 phr) and epoxidation on curing characteristics, reversion and fatigue life of carbon black filled natural rubber compounds have been studied. Three different types of natural rubber, SMR L, ENR 25 and ENR 50 having 0, 25 and 50 mol% of epoxidation and con…
Photoelectrochemical microscopy (PEM) was used to locate pitting precursor sites on polycrystalline titanium immersed in sulfuric acid and in ferrocyanide solutions. PEM imaging was done with both a conventional method and a new shear‐force feedback method. The resolution of the PEM images obtained are highly dependen…
Phenanthro[a] phenazine, a new heterocyclic ring structure of both biological and physical interest, has been prepared by coupling 1,2-phenylenediamine with triphenylene-1,2-diquinone derivatives in high yields. 2,3,6,7,10-Penta-alkoxyphenanthro[a] phenazines are mesogenic over a broad temperature range. These novel u…
Abstract Following a study of the mechanical properties of recycled PVC recovered from post‐consumer bottles, this study focuses on the effects of recycled material on processing. In particular, the effects of multiple recycling were studied to investigate any problems that may arise due to the repeated incorporation…
Biodegradable composites consisting of flax (FF) and cotton (CT) fiber mats and poly(ester amide) (PEA) films were hot pressed using the film stacking process. The process parameters press temperature, pressure, press time in the tool, and drying conditions of fiber and matrix were optimized with regard to the mechani…
Four series of poly(o-hydroxy amide)s were prepared by the low-temperature solution polycondensation of the bis(ether benzoyl chloride)s extended from hydroquinone and its methyl-, tert-butyl-, or phenyl-substituted derivatives with three bis(o-aminophenol)s. Most of the poly(o-hydroxy amide)s displayed an amorphous n…
OBJECTIVE: Fetal cardiac development includes rapid formation of a three-dimensional collagen network, composed mainly of type I and III fibrillar collagens. Collagen fibrils have been found in cardiac jelly at very early stages of cardiac development and are thought to have structural and functional properties. In ad…
With its excellent color and tone reproduction, thermal dye transfer printing produces continuous-tone color images that rival silver halide photography. However, conventional thermal dye transfer images fade easily when subjected to light or heat. To solve this problem, we have studied a chelate compound system and h…
Although eddy current losses in flitch plates of large power transformers may form a small part of total transformer losses, they are important because they can appear concentrated in a small area and cause hazardous hot-spots. An analytical method to calculate flitch plate eddy loss is a very useful practical guide t…
Some N-containing or S-containing organic substances and some acetylenic alcohols were tested as inhibitors of the corrosive attack suffered by Fe-based metallic glasses in deaerated 0.1 N sulfuric acid (H2SO4) solution at 25°C. It was verified that the specific action these compounds exerted on the corrosion process…
Off-stoichiometric NiZn ferrite was obtained by hydrothermal process and compacted in torus form under different pressures. Two samples A1 and A2 - cobalt doped (0.5 %) were sintered at 1573 K in air atmosphere during 3 h. The magnetic properties were studied by vibrating sample magnetometry, Mössbauer spectroscopy an…
Abstract The properties of recycled PVC bottle material separated from the post‐consumer waste stream were investigated. In the first part of this study, attention was focused on the mechanical properties. In order to examine the effects of recycling, the properties of the recycled material were compared with those of…
Thin films of vanadium oxide were prepared by means of r.f. reactive sputtering. Their physical properties were studied as a function of the oxygen content in the sputtering atmosphere. Atomic force microscopy (AFM) and X-ray photoelectron spectromicroscopy (XPSM) investigations have been used for the study of the mor…
Pyridine-catalyzed reactions of methyldichlorosilane with bis(trimethylsilyl)carbodiimide afford a dichlorosilane-derived anhydrous sol–gel material. Both trimethylchlorosilane formation and Si–H disproportionation act as crosslinking mechanisms. The dried gels form amorphous or crystalline materials, depending on th…
LaGaO3 is reported to undergo a low-temperature phase transition from Pnma to R3c at 418 K. The phases involved in the low-temperature phase transition of LaGaO3 were determined using Raman spectroscopy from 77 to 773 K. There is a total of 17 bands observed in the room temperature (294 K) Raman spectrum, namely, 55(A…
Basic regularities of silicon nitride based materials microstructure formation and development in interrelation with processing conditions, type of sintering additives, and starting powders properties are discussed. Models of abnormal or exaggerated grain growth are critically reassessed. Results of several model expe…
The existence of a global gene regulatory system in the hyperthermophilic archaeon Sulfolobus solfataricus is described. The system is responsive to carbon source quality and acts at the level of transcription to coordinate synthesis of three physically unlinked glycosyl hydrolases implicated in carbohydrate utilizati…