Materials Literature
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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…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract A double bubble tubular film process to produce biaxially oriented poly(p‐phenylene sulfide) (PPS) film is described. Operating windows were developed for stable operation of both the first and second bubbles. Films produced from single bubble tubular film extrusion were largely amorphous having only seven to…
Anodic dissolution of 420 stainless steel (Fe‐13Cr alloy) in concentrated phosphoric acid, sulfuric acid, and their mixtures has been studied to determine the conditions that lead to electropolishing of the alloy in these electrolytes. A rotating disk electrode system has been employed to study the influence of electr…
The unsubstituted polyazine, -[N=CH-CH=N]X-, has been synthesized from glyoxal dihydrazone and glyoxal. An X-ray crystal structure was done on the monomer glyoxal dihydrazone; it crystallized in space group P21/a with cell constants a = 7.744 (4) Å, b = 4.113 (1) Å, c = 8.063 (4) Å, and β = 115.66 (3)° and Z = 2; inte…
The interaction of strontium overlayers with atomically clean Si(100) surface has been studied by x-ray photoelectron spectroscopy. Also studied were the effects of Sr overlayers on the oxidation of silicon at different Sr coverage (0≤θ≤1.85) and different oxygen exposure. It is found that at low coverage, θ≤1 monolay…
Phase stability of chromium films plated from chromic acid electrolyte containing formic acid is studied by means of x‐ray diffraction and transmission electron microscopy. Five process parameters of electroplating are systematically varied and three different kinds of vacuum anneal are chosen in order to induce phase…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic characterization of electron-transfer salts of hexacyanotrimethylenecyclopropanide, {C3[C(CN)2]3}.bul.- and [Fe(C5Me5)2].bul.+ (1:1; two phases) and [Fe(C6H3Me3)2]2+ (1:2). Evidence for 1-D antiferromagnetic behavior in segregated {Fe(C5Me5)2].bul.+ c…
The first-order Raman spectra of individual 8-μm-diam PAN-derived carbon fibers which had been annealed at five temperatures from 1700 to 2800 °C are measured as a function of incident laser power from 1 to 140 mW. In all fibers studied, the Raman frequencies of the graphite G band at ca. 1580 cm−1 and the disordered-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver(II) tetraneopentoxyphthalocyanine and its redox chemistryGuoyi Fu, Yansong Fu, K. Jayaraj, and A. B. P. LeverCite this: Inorg. Chem. 1990, 29, 20, 4090–4095Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 Octobe…
Abstract Polyimide/polydimethylsiloxane (PI/PDMS) graft copolymers with various PDMS contents were prepared by polycondensation of PDMS macromonomer 1 with aromatic diamines and pyromellitic dianhydride followed by heating at 220°C. The PDMS content of the grafts copolymers was controlled by changing the average degre…
Abstract Platy (Te Puke, New Zealand), cylindrical (Spruce Pine, North Carolina), and spherical (North Gardiner mine, Huron, Lawrence County, Indiana) halloysite samples were analyzed by high-pressure differential thermal analysis (HP-DTA) to determine the effect of morphological and chemical differences on their resp…
Luminescence of Bi 3+ or/and Mn 2+ in LnMB 5 O 10 system of phosphor has been studied. Bi 3+ in LnMB 5 O 10 leads to two types of emissions, viz. emission due to (i) Bi 3+ isolated centres and (ii) Bi 3+ clusters. In LaMB 5 O 10 , Bi 3+ emission can cover longer distances (25 Å) for resonant transfer. In LaMgB 5 O 10…