Materials Literature
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Abstract Accuracy, or how well a measurement conforms to the true value of a parameter, is important in XRD analyses in three primary areas, 1) 26 position or d-spacing; 2) peak shape; and 3) intensity. Instrumental factors affecting accuracy include zero-point, axial-divergence, and specimen- displacement errors, ste…
The effects of heat treatments of the industrial type: 8 h hold times at temperatures comprised between 600°C and lOOO’C, on the structural, mechanical and corrosion resistance characteristics of weld alloy 625 have been studied. During the heat treatments, the mean concentration ratios of Nb, MO, Si, Cr, Ni and Fe el…
The efficiency of additives against photoageing of poly(vinyl chloride) was evaluated by means of a combination of spectroscopic and chromatographic methods. IR and UV-VIS spectroscopy reveal the formation of chemical groups (such as carbonyl or polyene) that are characteristic products of the early stages of photodeg…
Thin-slice accelerated aging methodologies have not been ag gressively pursued because of concerns about the reliability and applicability of the results. The use of gases such as helium, nitrogen and carbon dioxide, which diffuse rapidly and are only sparingly soluble in the polymer, may be used to obtain a diffu sio…
A number of new DMIT derivatives have been synthesized and their structures have been determined. Among them only chiral BNPT-DTO has significant powder SHG efficiency which varies strongly with the crystal growth solvent and the crystalline temperature; this corresponds to its variability in molecular configuration.…
A rigorous numerical simulation of imaging in an optical scanning microscope is described. The sample is assumed to be a perfectly conducting one-dimensional surface-relief object. The approach is capable of taking into account multiple interactions between the illuminating field and the surface and is also valid for…
The complexation of zinc and magnesium complexes of tetra(3,5-di-tert-butylphenyl)porphyrin with 3′,5′-di-tert-butyl-2-stilbazole is reversibly photoswitchable by UV and visible light via trans–cis isomerization of the stilbazole.
Abstract
Adhesion durability of dc magnetron sputtered tantalum to in situ radio frequency (rf) plasma treated biphenyl tetracarboxylic acid dianhydride–para phenylene diamine (BPDA-PDA) polyimide films was determined as a function of repeated 400 °C thermal exposure cycles and 85 °C/80% temperature/humidity (T/H) exposures. r…
Abstract Surface treatments are applied to magnesium parts primarily to improve their appearance and corrosion resistance. Mechanical and chemical cleaning methods are used singly or in combination, depending on the specific application and product involved to ensure repetitive reliability. This article focuses on mec…
A new method for measuring the magnetostriction of silicon steel sheet using a laser Doppler velocimeter has been developed. This method has the following advantages: (a) non-contact measurement, (b) better resolution (less than 4/spl times/10/sup -8/ m under the condition that the error is within 1%) than conventiona…
A thin cylindrical shell under general thermal and mechanical shocks is considered. The fields of displacements and temperature are assumed to be coupled through a system of dynamic thermoelastic equations. The method of solution is based on Galerkin finite element and Kantorouich approximation for space and time doma…
The photophysics of polyimides and several N-arylphthalimide model compounds has been investigated as part of an effort to understand the factors that control the oxidative photodegradation of these materials. Substituents that increase the donor-acceptor (D-A) character of both polymers and models cause an enhancemen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic studies of barium aluminate glycolate, Ba[Al2(C2H4O2)4], a 5-coordinate aluminum compoundBruno Herreros, Tery L. Barr, and Jacek KlinowskiCite this: J. Phys. Chem. 1994, 98, 3, 738–741Publication Date (Print):January 1, 1994Publication History Published online1…
Pyrrole is polymerised in the presence of ultrafine silica-coated magnetite particles; the resulting colloidal poly(pyrrole)–silica–magnetite nanocomposites have a conducting polymer content of 75 mass% and exhibit superparamagnetism.
Abstract The shape and size of voids, and the grown region surrounding a large void were investigated in In x Ga 1– x Sb crystals, which were pulled under the introduction of ultrasonic vibrations into the source melt by using a modified Czochralski apparatus. The presence of voids in crystals resulted from (1) atmosp…
Stainless steels, such as types 316L and 304 have high susceptibilities to pitting and crevice corrosion in natural seawater even though they have low susceptibilities in synthetic seawater. Recently, this type of corrosion has been recognized as a kind of Microbially Influenced Corrosion (MIC) in aerobic aqueous envi…
Residual stresses and distortions developing during martensitic hardening of steel can be quantitatively determined by finite element calculations, if the underlying processes are adequately modelled and the materials and process data necessary are known. In this context also transformation plasticity effects have to…
Ovarian cancer is the leading cause of death in women with a gynecologic malignancy. The main reason for the high mortality is the late occurrence of symptoms, resulting in an advanced diseased state at the time of diagnosis. Since ovarian cancer remains confined to the peritoneal cavity virtually throughout its entir…
The dynamic behavior of free conducting particles in SF/sub 6/ insulated systems under switching impulse (SI) superimposed on a dc voltage is investigated. This study includes the influence of the most important design parameters on the particle motion, such as value of dc/switching voltage ratio, particle parameters,…