Materials Literature
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Rare-earth doped phosphors are discussed here which exhibit intense fluorescence well above 1000C. This is a rare characteristic for solidstate materials. One immediate application for them is thermometry. For example surface temperatures of rotating components systems in hostile or restricted environments and systems…
It has previously been determined that absorption of infrared radiation in germanium due to free carriers can be controlled to some extent by doping. As a result, the use of germanium in infrared systems can be extended to thermal environments not possible before. This can be accomplished by using lower resistivity ge…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoisomerization of spirobenzopyran in polystyrene filmToshiaki Ito, Mitsuo Hiramatsu, Isuke Hirano, and Hiroyuki OhtaniCite this: Macromolecules 1990, 23, 21, 4528–4532Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue…
Calcium aluminosilicate glass cements are produced by quenching a liquid from 1600°C to room temperature. After grinding and mixing with water, the glass cements hydrate without activators and develop good mechanical properties. The glass cements based on compositions close to gehlenite develop better mechanical prope…
The use of lyotropic liquid crystal polymers such as Kevlar and Twaron in high tech engineering applications has been common for many years. These materials possess excellent temperature resistance and very good mechanical properties. These two materials are polyaramids, but the newer polybenzazoles are also of a liqu…
Ca3(PO4)2, an essential constituent of bones and teeth, was doped with CeO2 and X irradiated to study its thermoluminescence (TL) and thermally exoelectron emission (TSEE). The intensity of the TL response against irradiation dose was increased remarkably by the addition of Ce ions, the TL peaks being found at (1) 90-…
Samples of apple fiber, corn fiber, oat bran, and soy fiber were heat processed in the autoclave and by microwave heat to determine the processing effect on the physical structure of the fiber. Scanning electron microscopy was used to evaluate these processing effects. Results showed the two processing methods yielded…
A method of significantly improving the tensile strength of PVC and PS re inforced with cellulosic fibers has been developed This method relies on the generation of free radicals to create chemical bonding between the coupling agent and the fibers Also a method of detecting the degree of attachment between silane and…
Abstract Soil samples collected from 33 outcrops of weathered plutonic, hypabyssal, and volcanic rocks scattered along a 1400 km traverse from the West Antarctic coastline to the Polar Plateau were analysed for clay mineral content. Clay minerals present (in approximate order of abundance) are “mica”, chlorite, illite…
Corrosion behavior of mild steel in various hydroxy acid solutions of glycolic, lactic, malic, tartaric, and citric acids was investigated by corrosion tests, electrochemical measurements, solution analysis, and new methods of surface analyses. The corrosion rates of mild steel decreased in the order of malic ( ca. 30…
Diamond particles have been embedded in hot‐pressed zinc sulfide (ZnS) ceramic to improve various mechanical properties while preserving special optical properties. Roomtemperature mechanical tests on small specimens have shown that adding 10 wt% diamond to ZnS has no effect on the yield stress, but increases the tens…
Abstract Poly(vinyl chloride) was mixed with various poly(methacrylate)s and polycarbonates by combined precipitation from common solutions. The thermal stability of the samples was measured at 180°C under nitrogen, the HCl evolved was detected by conductometry. UV‐Vis‐spectra of degraded samples were measured to inve…
Abstract Spherical halloysite aggregates have been identified for the first time in mineral matter isolated from bituminous coals. The spherules, found in Permian coals of the Sydney basin, New South Wales, range from 0.4 to 0.6 µ m in diameter and have a delicate ring-like structure that helps to confirm the halloysi…
The refractive index n is known to vary with the temperature. Thus the optical path length and the focusing properties of transmissive optical elements may change with the ambient temperature T. Since there was no reliable dispersion formula of the temperature coefficient dn/dT the manufacturers of optical glasses pub…
Two responses to the challenge of developing superior structural materials for the aerospace industry, Weldalite Al–Li alloys and XD technology, are briefly described.MST/1319
Abstract. In order to forecast consequences of climatic changes for littoral algae in coastal ecosystems, the effects of temperature increase on spring bloom dynamics of epilithic diatom communities were studied in two ways: (1) Communities were compared from sites receiving different amounts of cooling water discharg…
Electroless plated thin films are being used in volume for current and next‐generation rigid disk media. The recording performance and density limitations of plated products have been extended in recent years due to advanced in plating technology. Significant understanding has been developed regarding the criticality…
The auditory brain stem implant is an investigational device designed to provide hearing sensations to patients without functioning auditory nerves. We analyzed results from 17 implants in 15 patients to determine if tumor size or preoperative hearing level might be related to proper device function. We found no signi…
Polyester carpet yarn is heat set during the production process in order to impart structural stability. Although batch (autoclave) and continuous (Superba TVP and Suessen GVA ) heat setting methods are used, the continuous processes are prevalent and constitute a greater part of this study. Commercial heat setting eq…
Radial-GRIN rod lenses of titanium doped silica have been prepared by a solgel process using metal alkoxides. The obtained rods with parabolic index distribution give high efficiency in coupling with optical fibers as well as good image resolution. Moreover they exhibit good stability in an adverse environment such as…