Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the ground state of manganese phthalocyanine in an argon matrix using magnetic circular dichroism and absorption spectroscopyBryce E. Williamson, Thomas C. VanCott, Michael E. Boyle, G. Christian Misener, Martin J. Stillman, and Paul N. SchatzCite this: J. A…
Abstract Magnesium hydroxide and magnesium carbonates have attracted attention as endothermic flame retardants that are sufficiently stable to be incorporated into thermoplastics without decomposition. In this survey, a basic form of magnesium carbonate, magnesium carbonate hydroxide pentahydrate [(MgCO 3 ) 4 · Mg(OH)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative theory of the globule-to-coil transition. 2. Density-density correlation in a globule and the hydrodynamic radius of a macromoleculeA. Yu. Grosberg and D. V. KuznetsovCite this: Macromolecules 1992, 25, 7, 1980–1990Publication Date (Print):March 1, 1992Publicati…
C and SiO 2 of different types were mixed and heat‐treated (1410° to 1550°C), according to a standardized temperature program, in flowing N 2 at different pressures. It was found that a starting material combination of C (115 m 2 /g) and SiO 2 (50 m 2 /g) yielded pure Si 3 N 4 after about 2 h at 1550°C and 1.3 MPa. By…
To investigate the effect of reoxidation on the grain‐boundary acceptor‐state density of reduced barium titanate, n ‐doped BaTiO 3 ceramics are sintered in a reducing atmosphere (2% H 2 + 98% N 2 ) and then annealed in oxygen. After annealing at 1150°C for different times, the experimental results show a relationship…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution thermodynamics of the ferric complexes of new desferrioxamine siderophores obtained by directed fermentationSilvia Konetschny-Rapp, Guenther Jung, Kenneth N. Raymond, Johannes Meiwes, and Hans ZaehnerCite this: J. Am. Chem. Soc. 1992, 114, 6, 2224–2230Publication Da…
ABSTRACT Molecular dynamic simulations of the thermal degradation of polyethylene were used to identify factors which might be effective in reducing polymer flammability by promoting the formation of a residual char. Computer movies of the calculated trajectories indicate that cross-linked polymers, such as those obta…
Dihydrodipicolinate synthase (EC 4.2.1.52), the first enzyme unique to lysine biosynthesis in bacteria and higher plants, has been purified to homogeneity from etiolated pea (Pisum sativum) seedlings using a combination of conventional and affinity chromatographic steps. This is the first report on a homogeneous prepa…
Textures of several liquid-crystalline solutions of poly(benzylglutamate) and a solution of hydroxypropylcellulose were videorecorded during and after shear and the images were Fourier transformed. We find for all the solutions that bands perpendicular to the flow direction form after cessation of prolonged shearing i…
We have developed a computational simulation of the two-dimensional soap froth, including finite Plateau borders. As the gas fraction фis decreased, there is a loss of rigidity at approximately ф=0·84, at which point the structure is that of a dense random packing of hard discs with contact number equal to four. This…
The authors have formulated a numerical approach for application to micromagnetics problems and have implemented the corresponding three-dimensional finite element code. The program has been applied to the study of hysteretic behavior and domain walls in a variety of samples. The authors discuss the numerical method a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-resolved light scattering studies on the early stage of crystallization in isotactic polypropyleneTetsuo Okada, Hiromu Saito, and Takashi InoueCite this: Macromolecules 1992, 25, 7, 1908–1911Publication Date (Print):March 1, 1992Publication History Published online1 May…
SUMMARY Published reports on the effect of temperature on the sorption of ions by soil, or soil constituents, are in conflict with regard to the direction of the effect and its interpretation. It is argued that, in many cases, increased sorption with increased temperature is due to an increased rate of the reaction th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and properties of lanthanum strontium titanate (La1-xSrxTiO3) (0 .ltoreq. x .ltoreq. 1)Joseph E. Sunstrom, IV, Susan M. Kauzlarich, and Peter KlavinsCite this: Chem. Mater. 1992, 4, 2, 346–353Publication Date (Print):March 1, 1992Publication History Pub…
The E loci in Bombyx mori are expected to contain a homeotic gene complex specifying the identities of the larval abdominal segments. However, the molecular structure of this complex remains to be determined. We have started to analyze the structural changes in the E complex mutations. We used three newly isolated Bom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxamidato complexes. 2. Copper(II) and nickel(II) complexes with oxamide-N,N'-diacetic acid: solution study, synthesis, crystal structures, and magnetic propertiesFrancesc Lloret, Jorunn Sletten, Rafael Ruiz, Miguel Julve, Juan Faus, and Michel VerdaguerCite this: Inorg. Che…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel copper complex and CVD precursor: (.eta.2-butyne)copper(I) hexafluoroacetylacetonateThomas H. Baum and Carl E. LarsonCite this: Chem. Mater. 1992, 4, 2, 365–369Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 Mar…
Two recently published methods of blood-brain barrier permeability measurement using Gd-DTPA scanning are compared by authors representing each group. The physiological models are reconciled. Results from both groups agree. These show that the transfer constant (the permeability surface area product per unit volume of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCocrystallization and phase segregation of polyethylene blends. 2. Synchrotron-sourced x-ray scattering and small-angle light scattering study of the blends between the D and H speciesKohji Tashiro, Michael M. Satkowski, Richard S. Stein, Yingjie Li, Benjamin Chu, and Shaw L…
The structural instability driven by soft phason modes in icosahedral quasicrystals is investigated. It is found that, depending on the physical parameters, three distinct soft modes induce the structural instabilities associated with the symmetry changes, ${\mathit{I}}_{\mathit{h}}$\ensuremath{\rightarrow}${\mathit{D…