Materials Literature
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A comprehensive account is presented of the state-of-the-art in filament-winding methods for high performance aerospace structural components employing advanced wet and prepreg resins and continuous-filament reinforcements. Component configurations producible by these means encompass cylindrical, spherical, and flat c…
We have looked for evidence of a correlation length in a molecular-dynamics simulation of the glass transition. We have studied the correlation functions of both the translational order of particle positions and the orientational order of nearest-neighbor bond angles, and have seen no indication of a diverging length…
Switching of the direction of polarization in ferroelectric thin films can be used as a mechanism for space-efficient memory storage in microcircuits. The fields required for adequate switching rates are of the order of 5 × 105 volts/cm. At these high fields, there are several potential mechanisms for the motion of ch…
Abstract Mutual precipitates of poly ( N, N ‐dimethyl acrylamide) and poly (4‐hydroxystyrene) were collected from dioxane, methanol, or acetone. The glass transition ( T g ) temperatures of the precipitates are higher than the weight‐average values. Clear films cast from dimethylformamide solutions have lower T g valu…
Lattice energy minimization and lattice dynamics calculations for the minerals andalusite, sillimanite, kyanite, diopside, cordierite, gehlenite, leucite, orthozoisite, grossular, and pyrope are compared with experimental data and previous calculations. The potential models used in this study included bond-bending int…
In a long-term outdoor test with high direct and alternating voltages, silicone and ethylene propylene diene monomer (EPDM) rubber composite insulators have, at the beginning, shown a performance superior to that of glass and porcelain insulators. In the long-term test, however, the silicone rubber composite insulator…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of vanadium-containing silsesquioxanesFrank J. Feher and John F. WalzerCite this: Inorg. Chem. 1991, 30, 8, 1689–1694Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pubs.…
An atomic model of defects on {113} in Si has been derived experimentally from high-resolution electron micrographs. A simulated image of the proposed model agrees well with experiment. The model is constructed by two kinds of structural units. One is incorporated by self interstitial atoms to form tiny rods of the he…
Our aim in this paper is to present a rather general non-linear continuum theory that may prove useful for the interpretation of observations and experiments upon smectic C liquid crystals. In its present formulation our theory is constrained to exclude variations in the layer spacing thickness and also changes in til…
The electronic state of ferromagnetic Ni and the expected magnetic circular dichroism (MCD) in Ni 2p\ensuremath{\rightarrow}3d x-ray-absorption spectroscopy [2p (XAS)] are discussed from a viewpoint of 3d configuration interaction on the basis of the Anderson impurity model. The model includes multiplet effects arisin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCritical molecular weight for block copolymer reinforcement of interfaces in a two-phase polymer blendCostantino Creton, Edward J. Kramer, and Georges HadziioannouCite this: Macromolecules 1991, 24, 8, 1846–1853Publication Date (Print):April 1, 1991Publication History Publis…
We previously reported that acetaldehyde increases the production of type I collagen in cultured rat fat-storing cells. We studied the regulation of this effect by determining the expression of procollagen type I, fibronectin and transforming growth factor-beta 1 messenger RNAs in passage 1 and 2 cultures of fat-stori…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and heat of solution of potassium dihydrogen citrateThomas V. Van AukenCite this: J. Chem. Eng. Data 1991, 36, 2, 255–257Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pubs.acs.org/doi/10.1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of novel poly(ether ketones) containing the o-dibenzoylbenzene moietyRina Singh and Allan S. HayCite this: Macromolecules 1991, 24, 9, 2637–2639Publication Date (Print):April 29, 1991Publication History Published online1 May 2002Published inissue 29 April 1991https…
Abstract The phase transitions in CsSnCl 3 and CsPbBr 3 have been studied by X-ray powder diffraction, by 81 Br-NQR and by 'H-, 119 Sn-, and 113 Cs-NMR. At room temperature in air CsSnCl 3 forms a hydrate which can be dehydrated to the monoclinic phase II of CsSnCl 3 . The high temperature phase I has the Perovskite s…
Results from centrifuge and 1‐g model tests of projectile penetration into granular soils are described. Solid spherical projectiles in four calibers were fired into uniform samples of dry sand at approximately 305 m/s. Comparison to full‐scale test results verified the suitability of the centrifuge testing technique…
The origin of “sonochemistry” is acoustic cavitation: the formation, expansion, and implosive collapse of bubbles in liquids irradiated with ultrasound. The compression of such bubbles generates intense local heating, which has been quantified recently from both chemical kinetic thermometry and from high-resolution so…
The temperature and frequency dependence of $^{7}\mathrm{Li}$, $^{19}\mathrm{F}$, and $^{23}\mathrm{Na}$ nuclear-spin relaxation (NSR) has been studied in various fluorozirconate (Zr-F) glasses between about 0.4 and 600 K. Below about 200 K the NSR is caused by low-frequency excitations of disordered modes intrinsic t…
Abstract The rehydration properties and behavior of interlayer cations of Ca-, Mg-, Na-, and K-saturated homoionic saponite and vermiculite heated at various temperatures were examined and their rehydration mechanisms elucidated. The most notable features of saponite were (1) except for the Mg-saturated specimen, all…
An electronic technique which greatly increases the apparent permeability of a magnetic core of a current transformer, without a galvanic connection to either of the usual primary or secondary winding circuits, is described. The number of turns and the turns ratio can be selected independently as desired. Means are av…