Materials Literature
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Abstract The structure of synthetic nitro-5,10,15,20-tetraphenylporphyrinato(piperidine)cobalt(III) has been determined by X-ray diffraction method. The results revealed that the porphyrin plane is markedly distorted to nonplanar due to the steric interaction between the axial piperidine and the porphyrin core.
The effects of vanadium and other elements on the pitting resistance of an 18% chromium ferritic stainless steel (SS) with less than 168 ppm carbon and nitrogen are reported. Vanadium was added to the base alloy in the concentration range of 1 to 4%, alone and in combination with titanium, niobium, nickel, copper, sil…
Abstract An earlier thermo‐analytical study of black powder, using small sample masses and slow heating rates, has been extended to an examination of the behaviour of black powder under the less‐controlled conditions of ignition and combustion, by simultaneous measurement of temperature profiles and burning rates. Bur…
Abstract A group‐theoretical method within the framework of the Landau theory of phase transitions is proposed to obtain and analyse a complete set of critical (primary) and noncritical (secondary) order parameters condensing as a result of a phase transition (complete condensate). The principal problems that can be s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe synthesis and structural characterization of the first gallacarborane sandwichMarc A. Bandman, Carolyn B. Knobler, and M. Frederick HawthorneCite this: Inorg. Chem. 1989, 28, 7, 1204–1206Publication Date (Print):April 1, 1989Publication History Published online1 May 2002…
Service loading imposed on engineering structures is often arbitrary or nonproportional. The paper presents an investigation of examining the effects of proportional and nonproportional loadings on the fracture behavior of mixed mode fracture. The anisotropic model of continuum damage mechanics capable of taking into…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChloride-induced assembly of manganese(II) complexes having oligomeric and chain structuresB. C. Unni Nair, J. E. Sheats, R. Ponteciello, D. Van Engen, V. Petrouleas, and G. C. DismukesCite this: Inorg. Chem. 1989, 28, 8, 1582–1587Publication Date (Print):April 1, 1989Public…
The Ba-hexagonal ferrites (BaFe 12 O 19 ) with Bi 2 O 3 as a sintering aid have been studied. The beneficial effects on magnetic and electrical properties are obtained for a ∼2.5 mol% Bi 2 O 3 content. The Bi 3+ ions in the present system seem to substitute for Fe 3+ at octahedral sites leading to formation of BaFe 12…
A vacancy relaxation model which predicts the DC lifetime, pulse DC lifetime, and AC lifetime for all waveforms and all frequencies above 10 kHz is proposed. The AC lifetimes of aluminum interconnect are experimentally found to be more than 10/sup 3/ times larger than DC lifetime at the same current density. AC stress…
The biotransformation of swertiamarin [1, a seco-iridoid glucoside isolated from Swertia japonica (Schult.) Makino] by human intestinal bacteria was investigated. Three metabolites were isolated and identified as erythrocentaurin (2), 5-hydroxymethylisochroman-1-one (3), and gentianine (4) by spectroscopic methods. Th…
Abstract The pressure‐volume‐temperature properties of poly(ether ether ketone) (PEEK) were studied experimentally at temperatures of 400°C and pressures to 200 MPa. Specific volume data were fitted successfully to the empirical Tait equation for T < T g and T > T m and to the theoretical Simha‐Somcynsky equatio…
Abstract Tensile specimens of isotactic polypropylene, initially crystallized in the β‐form with high purity, were tested at various temperatures. It was observed by WAXD that the most important phenomenon occurring in the course of a tensile test is the β‐smectic transformation for specimens drawn at lower temperatur…
The hysteresis effects of fluids confined in porous media are studied by means of a new microscopic model. We consider a slitlike pore of infinite area and finite height. In contrast to the unbounded parallel-plate case, the new model allows the formation and the disappearance of curved menisci at the open ends of the…
The distribution of cations between octahedral and tetrahedral sites in Fe3O4-FeAl2O4, Fe3O4-MgFe2O4, and Fe3O4-MgAl2O4 solid solutions has been detrmined in situ at 600°C to 1400°C and 1-atm pressure. The joint Fe3O4-MgFe2O4 fits reasonably well to either the simple constant KFe2+-Fe3+Cd and KMg-Fe3+Cd model (Navrots…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArtificial photosynthesis of .beta.-ketocarboxylic acids from carbon dioxide and ketones via enolate complexes of aluminum porphyrinYasuhiro Hirai, Takuzo Aida, and Shohei InoueCite this: J. Am. Chem. Soc. 1989, 111, 8, 3062–3063Publication Date (Print):April 1, 1989Publicat…
The sequence of precipitation and its kinetics in 17–4 PH (precipitation hardening) stainless steel were studied by observing the electrical resistivity and microstructure of the alloy during isothermal aging at various temperatures in the range 320–600°C. By the absence of an incubation period for the onset of precip…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate minimum in solution crystallization of long paraffinsS. J. Organ, G. Ungar, and A. KellerCite this: Macromolecules 1989, 22, 4, 1995–2000Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989https://pubs.acs.or…
We investigate functions u: \mathbf R^n → \mathbf R which minimize a variational integral \int \mathrm{F}(x,\:u(x),u_{x}(x))dx where \mathrm F: \mathbf R^n × \mathbf R × \mathbf R^n → \mathbf R is periodic in (x, u) \in \mathbf R^{n + 1} and uniformly convex in u_x \in \mathbf R^n . We restrict attention to non-selfin…
Dielectric properties and structural characteristics of BaTiO 3 ceramics are significantly influenced by small addition (2 wt%) of ZrO 2 . SEM and TEM observations revealed enhanced microstructural uniformity and retarded grain growth depending on sintering temperature. Above 1320°C, Zr diffusion into the BaTiO 3 latt…
Abstract not Available.