Materials Literature
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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,…
A finite element formulation is presented for the modeling of electromagnetic wave interactions with dielectric structures which are periodic in one dimension in a cartesian coordinate system. The structures are two-dimensional, in the sense that the geometry and material properties remain invariant in one of the othe…
Corrosion inhibitors are widely used in industry, although in many cases their surface chemistry is not well understood. Several nitrogen‐containing organic compounds have been used as corrosion inhibitors. Corrosion inhibition is a surface process which involves the specific adsorption of inhibitors on the metal surf…
From the dependences of electrical conductivity [sgrave]1 and the Hall constant RH( B ‖ C ) of Bi2 Te3-xSx crystals upon the value of x it is found that a transition from hole-like to electron-like conductivity takes place at x × 0.12. The decrease in the hole concentration with increasing x is explained by the idea t…
Framework compositions [Sn5S12]4– have been synthesized hydrothermally in the presence of triethylenediamine (Dabco) and caesium, respectively; the cations are accommodated between the sheets with orientation relationships suggestive of a templating mechanism and their crystal structures have been determined.
The crystal structure of 2-amino-5-nitropyridinium acetophosphonate confirms the possibility to design at request non-centrosymmetric structures based on the 2-amino-5-nitropyridinium polar chromophore. The non-centrosymmetry in this class of materials is mainly dependent on the structure of the associated counter-ani…
Iron and steel slags are often used as subbase materials in the construction of highways. Previous studies have suggested that the free lime (CaO) in these subbases is responsible for the deposition of calcium carbonate (tufa) in many highway drains. Clogging of these drains leads to the deterioration of highways. Pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGallium hydrogen selenite diselenite hydrate, Ga(HSeO3)(Se2O5).cntdot.1.07H2O: a novel structure type containing alternating cationic and anionic layersRussell E. Morris and Anthony K. CheethamCite this: Chem. Mater. 1994, 6, 1, 67–69Publication Date (Print):January 1, 1994P…
Stereospecific sequential condensation of paraformaldehyde and propionaldehyde with a tripodal bis(triamine)cobalt(III) template rapidly encapsulates the metal, and a subsequent facile reduction of imine functions gives an expanded cavity hexaazabicyclic cage system with unusual structural and chromophore electron pro…