Materials Literature
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Effects of intrinsic defects on defect formation by excimer-laser irradiation were examined in synthetic silica glasses prepared by different methods. In samples containing oxygen-deficient centers (ODC's), laser-induced E' centers were stable at room temperature. In contrast, in samples heat treated in ${\mathrm{H}}_…
The infrared and Raman spectra of oligomeric model molecules of polyparaphenylenevinylene (PPV) and of the polymer in the pristine state, and the infrared spectra of doped or photoexcited PPV are analyzed in terms of the theory of the effective conjugation coordinate (ECC). It is shown that all the spectroscopic obser…
A detailed study of the electrical and defect properties of ion-implanted erbium in silicon shows that erbium doping introduces donor states. The concentration of erbium related donors as a function of implant dose saturates at 4×1016 cm−3 at a peak implanted Er-ion concentration of (4–7)×1017 cm−3. The defect levels…
The smectic layer thickness and the switching behavior in MHPOBC have been studied as a function of temperature; SmC α * is a tilted phase and is antiferroelectric at least in the higher-temperature region but becomes ferrielectric with decreasing temperature. The gradual appearance of ferrielectric characteristics in…
The two‐phase field involves a ZrO 2 ‐TiO 2 solid solution containing no more than 4 mol% TiO 2 , and a BaTiO 3 ‐BaZrO 3 solid solution containing a maximum of 75 mol% BaTiO 3 . The field narrows above 1300°C, probably because of the intrusion of a liquid‐phase field into the ternary, beginning near the BaO‐TiO 2 edge.
Abstract The linear coefficient of thermal expansion for three silicon single-crystal samples, taken from the head, middle, and tail of the same boule, and their powder samples have been measured at room temperature by using an X-ray powder diffractometer. All samples yield the same expansion value α =2.45 (± 0.04) ×…
The activity of NiO in NiO‐MgO rock salt solid solution has been measured at 1300 K by employing a solid‐state galvanic cell: Pt,Ni+ NiO||(CaO)ZrO 2 ||Ni + (Ni x ,Mg l‐x )O, Pt. A high‐density tube of Zr0 2 ‐15 mol% CaO has been used as the solid electrolyte for the emf measurements. The activities of the component ox…
The genus Cvptostegia R. Br. comprises two species, both of which are endemic to Madagascar. One species, C. grandiflora Roxb. ex R. Br., is widely naturalised in tropical regions of the world. The other species, C. madagascariensis Bojer ex Decne., comprises three varieties, of which C. madagascariensis var. glaberri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature effects on the crystallization kinetics of size-dependent systems in a continuous mixed-suspension mixed-product removal crystallizerJenn Fang Wu, Clifford Y. Tai, Wei Koun Yang, and Lii Ping LeuCite this: Ind. Eng. Chem. Res. 1991, 30, 9, 2226–2233Publication Da…
Abstract An off-line experimental simulation of cooling and warpage of rotationally molded parts is described. Slabs of polyethylene rotationally molded parts containing thermocouples and monitored by displacement transducers are placed on a metal surface representing a mold wall. This is cooled by varying methods suc…
Biological corrosion, the interaction of organisms with corrosion processes, is a complex subject encompassing contributions from several disciplines ranging from chemistry and surface science to microbiology and bacteriology. Two main aspects of the subject – corrosion and fouling – are considered in this review. The…
We investigated the ability of aberration-corrected concave holographic gratings used in the Rowland mount at normal diffraction to provide high spectral resolution in the far-ultraviolet region. By assuming that astigmatism and spherical aberration are geometrically corrected by an ellipsoid, we show that holography…
Progress in patterning technologies and computer-aided circuit designs have brought us to the threshold of submicron dimensions in the fabrication of very large scale integrated circuits. For metallization at submicron dimensions, several requirements must be satisfied. In the present study we have prepared pure Al an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and solution structure of two dinuclear hexadentate macrocyclic complexes of palladium(II)A. McAuley, T. W. Whitcombe, and M. J. ZaworotkoCite this: Inorg. Chem. 1991, 30, 18, 3513–3520Publication Date (Print):September 1, 1991Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of binary blends of linear polystyrenes: further examination of constraint release modelsHiroshi Watanabe, Manabu Yamazaki, Hirotsugu Yoshida, and Tadao KotakaCite this: Macromolecules 1991, 24, 20, 5573–5581Publication Date (Print):September 1, 1991P…
Changes in the crystallinity and polymorph of chitosan, which may affect its functionality, by heating (up to 200°C) its water suspension were studied by X-ray diffraction measurements, using tendon chitosan prepared by N-deacetylation of a crab tendon chitin, and chitosan powders with various degrees of polymerizatio…
Abstract By XPS it is confirmed that copper‐containing catalysts supported on alumina and calcined at high temperature (673–873 k for 24 h.), with or without zinc addition, have a ‘surface spinel’ structure. Combining the XPS results with previous results obtained by vis–UV reflectance spectroscopy and XRD we show tha…
Abstract HNBR, hydrogenated nitrile rubber, is a heat-, oil-, and fuel-resistant elastomer produced by the selective hydrogenation of NBR. As shown in Table I, HNBR is a highly saturated nitrile elastomer consisting of units of acrylonitrile, ethylene, unsaturated butadiene, and hydrogenated vinyl butadiene. The acryl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopochemical induction to an alternating zigzag-linear and "syndiotactic" chain structure in the course of [2+2] photoreaction of alkyl .alpha.-cyano-4-[2-(2-pyridyl)ethenyl]cinnamate crystalsChan Moon Chung, Akira Kunita, Keiichi Hayashi, Fumihiko Nakamura, Kazuhiko Saigo,…
On ODP Leg 119, specimens collected of Eucampia antarctica (Castracane) Mangin var. antarctica exhibited morphological and distribution patterns that contrasted with those of Eucampia antarctica var. recta (Mangin) G. Fryxell et Prasad. E. antarctica var. antarctica was found over the northern Kerguelen Plateau, north…