Materials Literature
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The technique of high-angle annular dark-field (HAADF) imaging, which is highly sensitive to atomic-number contrast, can be performed on TEM/STEM systems using the standard annular dark-field detector. For optimum HAADF imaging, the TEM/STEM must have a high maximum diffraction angle, small minimum camera length, and…
<div class="htmlview paragraph">The cylinder of the aluminum engine block without iron sleeve was coated directly with thin thermal barrier coatings of zirconia and chrome oxide. The cylinder head and valve face and the piston crown were also coated. These three engine components were tested individually and tog…
Selen-tellurium is a mixture of the minerals selenium and tellurium. The atoms in stibarsen are ordered (completely or partially) so that the correct chemical formula is AsSb. Matildite AgBiS2, bohdanowiczite AgBiSe2, and volynskite AgBiTe2, show atomic ordering in space group P3ml with unit-cell dimensions similar to…
The effect of forced and natural convection on the shape evolution of deep cavities during wet chemical etching was investigated. Etching was assumed to be limited by removal of the dissolution products away from the vicinity of the active surface. Finite element methods were employed to solve for the fluid velocity a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification of a novel tetragonally compressed six-coordinate copper(II) complex: preparation and characterization of a 3-chloroanilinium copper chloride complex, (3-chloroanilinium)8[CuCl6]Cl4Denise A. Tucker, Peter S. White, Kathleen L. Trojan, Martin L. Kirk, and Willi…
I n situ nitrogen-ion implantation of polycrystalline niobium and tantalum was performed and the surface was characterized by x-ray photoelectron spectroscopy (XPS). The XPS chemical shifts indicated the formation of metal nitride. The chemical shift values are calculated theoretically and compared with the experiment…
The optical transfer matrix technique for the analysis of optical harmonic generation and mixing in laminar structures is extended to include the case of anisotropic media. This approach is applicable in the limit of low conversion efficiencies, where attenuation and phase shifts of the pump beams due to nonlinear int…
The influence of oxygen vacancies on the electronic structure of yttrium oxide was investigated both experimentally and theoretically. By means of X‐ray absorption spectroscopy, at the yttrium K and L 11 edges and at the oxygen K edge, information on the local densities of states of various orbital symmetries, around…
The ordinary control method, pulse width modulation (PWM) control method, for the shape memory alloy (SMA) actuator has a basic defect: the response of an SMA actuator controlled by this method is very slow, because the maxi mum voltage supplied to the SMA must be kept low in order to prevent the SMA from burning beca…
Corrosion inhibition of steel (ASTM A619) by two marine isolates, Pseudomonas sp.S9 and Serratia marces‐cens EF190, was investigated by weight loss measurements of metal coupons placed in static batch cultures. Artificial seawater with (VNSS) and without (NSS) nutrients was used. The effects of bulk‐ and surface local…
Summary This paper presents a model for predicting the scaling tendencies of barium, strontium, and calcium sulfates resulting from the mixing of injected and formation waters and from temperature and pressure effects. The model also predicts competitive simultaneous coprecipitation of BaSO4, CaSO4, and SrSO4, where s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntioxidative mechanism of maize zein in powder model systems against methyl linoleate: effect of water activity and coexistence of antioxidantsJin Ye Wang, Kenshiro Fujimoto, Teruo Miyazawa, and Yasushi EndoCite this: J. Agric. Food Chem. 1991, 39, 2, 351–355Publication Dat…
Transcription of the fibroin gene can be reconstituted with partially purified components from HeLa cells. Transcription factors IIB, IID, and IIE and RNA polymerase II are required for accurate initiation of transcription. Linear and relaxed closed circular DNA show a similar level of template activity. However, tran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonolysis of water-methanol mixturesJoerg Buettner, Maritza Gutierrez, and A. HengleinCite this: J. Phys. Chem. 1991, 95, 4, 1528–1530Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February 1991https://pubs.acs.org/…
Abstract We consider large eigenvalue problems for skeletal structures with symmetry. We present an algorithm, based upon a novel combination of group‐theoretic ideas and substructuring techniques, that block‐diagonalizes such systems exactly and efficiently. The procedure requires only the structural matrices of a re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMercerization of cellulose. 5. Crystal and molecular structure of Na-cellulose IHisao Nishimura, Takeshi Okano, and Anatole SarkoCite this: Macromolecules 1991, 24, 3, 759–770Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published ini…
It is shown that quantitative X-ray powder diffraction analyses using full profile multiphase refinement should include corrections for the Brindley particle absorption contrast effect. This is demonstrated with synthetic mixtures of the highly contrasting phases LiF and Pb(NO3)2 (μ/ρ = 20 and 231 cm−1 for Co Kα). Wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis of functionalized polypropyleneT. C. Chung and D. RhubrightCite this: Macromolecules 1991, 24, 4, 970–972Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February 1991https://pubs.acs.org/doi/10.1021/ma00004a026…
Discotic columnar mesophase behaviour exhibited by ten metal-free and copper 1,4,8,11,15,18,22,25- octa-alkylphthalocyanines has been characterised by optical microscopy, differential scanning calorimetry, x-ray diffraction and electronic absorption spectroscopy. Compounds with side-chains as short as hexyl exhibit on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conducting polymers containing alternating substituted phenylenes and bithiophene repeat unitsJohn R. Reynolds, Jose P. Ruiz, Andrew D. Child, Kasinath Nayak, and Dennis S. MarynickCite this: Macromolecules 1991, 24, 3, 678–687Publication Date (Print):February 1…