Materials Literature
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A perovskitelike compound ${\mathrm{LaTiO}}_{3}$ shows insulating or barely metallic behavior depending on a slight (\ensuremath{\le}0.04) deviation of the Ti valence (+3) arising from nonstoichiometry of La and/or oxygen. In order to investigate electronic properties of the specimens in the very vicinity of the Mott…
The head-to-head self assembly of two [CoAgL2]3+ units in the solid state results in a tetranuclear complex (shown on the right), which is not held together by AgAg interactions, but by stacking interactions between pyridine rings. This and the preceeding communication show that supramolecular complex chemistry is bo…
We have studied the dielectric behavior in the antiferroelectric SmCA* phase of 4-(1-methyl-heptyloxycarbonyl)phenyl 4'-octyloxybiphenyl-4-carboxylate (MHPOBC). Two dielectric relaxations were recognized without a dc field in SmCA*. The lower-frequency relaxation is attributed to the rotation around the short axis of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterference of spinodal waves in thin polymer filmsGeorg Krausch, Chi An Dai, Edward J. Kramer, John F. Marko, and Frank S. BatesCite this: Macromolecules 1993, 26, 21, 5566–5571Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published…
The simulator solves for the temperature distribution within the semiconductor devices, packages, and heat sinks (thermal network) as well as the currents and voltages within the electrical network. The thermal network is coupled to the electrical network through the electrothermal models for the semiconductor devices…
Tirapazamine (SR 4233), a benzotriazine di-N-oxide, a potent and selective killer of hypoxic cells, is currently in Phase I clinical trials with the expectation that it will be combined with radiation therapy. However, because of the likelihood that hypoxic tumor cells may also be resistant to some commonly used chemo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron correlation in tetrapyrroles: ab initio calculations on porphyrin and the tautomers of chlorinJan Almlof, Thomas H. Fischer, Paul G. Gassman, Abhik Ghosh, and Marco HaeserCite this: J. Phys. Chem. 1993, 97, 42, 10964–10970Publication Date (Print):October 1, 1993Publ…
Mitogen-activated protein-kinase (MAP) kinase-activated protein kinases 1 and 2 (MAPKAP kinase-1, MAPKAP kinase-2), were found to phosphorylate bacterially expressed human tyrosine hydroxylase in vitro at comparable rates to other proteins thought to be physiological substrates of these protein kinases. The phosphoryl…
In the framework of the European project aimed at the sequencing of the Bacillus subtilis genome the DNA region located between gerB (314°) and sacXV (333°) was assigned to the Institut Pasteur. In this paper we describe the cloning and sequencing of a segment of 97 kb of contiguous DNA. Ninety-two open reading frames…
Use of thermoplastic olefin elastomers (TPO) is expected to enjoy a 12% annual growth worldwide through 1996. The majority of growth is in au tomotive applications such as bumper fascia, claddings, exterior panels, airbag covers and instrument panels, etc. This healthy forecast is fueled by the overall cost/performanc…
We have examined the spatio-temporal distribution of collagen type VI (Col VI) during neural crest development in vivo and its ability to promote neural crest cell attachment and migration in vitro. An affinity purified antiserum and chain-specific monoclonal antibodies against chicken Col VI were employed to immunolo…
4 GPa pressure, 600 °C, and a reaction time of 5 minutes—under these conditions LiSi can be prepared from the elements. Like the homologous silicides MSi (M NaCs), which have been known for a long time, LiSi also belongs to the Zintl phases. The Si− ions form a three-dimensional network in a structure comprising pu…
The complex dielectric permittivity has been measured as a function of the frequency, the temperature and the biasing field for the antiferroelectric liquid crystal tolan C8 and C10. At the transition from the ferrielectric phase to the antiferroelectric one the remarkable maximum has been observed for low frequencies…
A model for constituent migration behavior in U-Pu-Zr metallic fast reactor fuel is proposed. It is based on diffusion equations for the ternary system under a radial temperature gradient, and it takes into account the alloy phase decomposition, assuming a quasi-binary U-Zr phase diagram with a constant plutonium cont…
A simple two-dimensional passivation and depassivation model for pitting corrosion has been developed. This model describes corrosion processes that are limited by the diffusion of either a corrosive agent or the diffusion of corrosion products that inhibit the corrosion process. Despite its simplicity, this model exh…
Localized pitting is best described by a characteristic parameter called the pitting potential value (Ep). Although Ep is governed by a number of factors, including alloy composition, metallurgical history, and the corrosive environment, the strongest effect on Ep is produced by certain additives that differ from the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFurther neighbor magnetic exchange interaction in a novel pseudolinear tetramer of copper(II)B. Chiari, O. Piovesana, T. Tarantelli, and P. F. ZanazziCite this: Inorg. Chem. 1993, 32, 22, 4834–4838Publication Date (Print):October 1, 1993Publication History Published online1…
An algorithm is proposed for the solution of non-convex variational problems. In order to avoid representing highly oscillatory functions on a mesh, an associated Young measure, which characterizes such oscillations, is also approximated. Sample calculations demonstrate the viability of this approach.
The corrosion behavior of a series of electrodeposited Al‐Mn alloys has been investigated. Three different microstructures were examined. A supersaturated face‐centered cubic (fcc) structure was produced with up to 5 atomic percent (a/o) Mn. Deposits containing 5–22 a/o Mn were composed of a glassy phase in combinatio…
Principles for the calculation of residual stresses due to thermal expansion mismatch and previous solutions are reviewed. A general model for this subject is proposed. Considering the effective thermoelastic properties of a unidirectional composite in axial and transverse directions allows a more comprehensive treatm…