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 ISSUEPREVArticleNEXTCore expansion, ruffling, and doming effects on metalloporphyrin vibrational frequenciesKristine Prendergast and Thomas G. SpiroCite this: J. Am. Chem. Soc. 1992, 114, 10, 3793–3801Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGround-state variability in .mu.3-oxide trinuclear mixed-valence manganese complexes: spin frustrationJames K. McCusker, Ho G. Jang, Sheyi Wang, George Christou, and David N. HendricksonCite this: Inorg. Chem. 1992, 31, 10, 1874–1880Publication Date (Print):May 1, 1992Public…
Abstract Two‐ and three‐component polypropylene (PP) blends and composites were prepared to study their structure/property relationships. Butadiene‐styrene (BDS) copolymers of low compatibility formed large particles of poor adhesion in PP resulting in inferior mechanical properties. Better miscibility of ethylene‐pro…
An explicit solution to the multivariable discrete linear quadratic (LQ) regulation problem is obtained in the limiting singular case where the input weighting matrix tends to zero. Such a solution follows from a suitable spectral factorization of the input spectrum density matrix under the assumption that the system…
High surface area NixAl2-2xO3-2x oxides have been prepared (x = 0, 0.33, 0.44, 0.5, 0.66, 0.85, 1) by a coprecipitation procedure. Both the precipitates and the calcined materials have been characterized structurally by XRD, FT-IR, and TG-DTG analyses. The precipitates are constituted by boehmite (x = 0), by amorphous…
The promoter region of the agarase gene (dagA) of Streptomyces coelicolor A3(2) is complex; it consists of four distinct promoters with different -10 and -35 regions. We report the isolation of a form of RNA polymerase that mediates transcription in vitro from the dagAp4 promoter. The core components of this RNA polym…
Abstract Die supramolekulare Chemie ist ein junges Forschungsgebiet, das rasch der reinen Synthese‐chemie entwachsen ist und das aufgrund seiner Neuartigkeit zur interdisziplinären Zusammenarbeit von Organischer und Anorganischer Chemie, Biochemie, Physikalischer und Theoretischer Chemie und Physik geführt hat. Beruht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomopolymer distributions in lamellar copolymer/homopolymer blendsKenneth R. Shull and Karen I. WineyCite this: Macromolecules 1992, 25, 10, 2637–2644Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://doi.org…
The preparation and solid-state characterization of the dimers of the cyanophenyl-substituted 1,2,3,5-dithia- and 1,2,3,5-diselenadiazolyl radicals [NCC6H4CN2E2]· (E = S, Se) are described. Crystals of the 4-cyanophenyl derivatives 4 are triclinic, space group P¯1. The radicals dimerize in a cofacial fashion, with mea…
The existence of three distinct forms of 2-5A synthetase, p40-p46, p69, and p100, has been established in interferon-treated human cells. The expression of these enzymes varies according to the cell type studied, and their properties are relatively different. By the use of polyclonal antibodies specific to p69, we hav…
Sol-gel derived ferroelectric thin films of lead zirconate titanate have been annealed through the rapid thermal annealing (RTA) technique to investigate the effect of various annealing temperature-time combinations. Crystallization of the film into the perovskite phase required 10 s at 600 °C and a mere 1 s at 700 °C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of incompletely-condensed silsesquioxanes with pentamethylantimony: a new synthesis of metallasilsesquioxanes with important implications for the chemistry of silica surfacesFrank J. Feher, Theodore A. Budzichowski, Kamyar Rahimian, and Joseph W. ZillerCite this: J…
Abstract The oxidized states of double‐stranded, planar (1,4‐phenylene)‐type ladder polymers are characterized by means of UV/VIS/NIR NIR: Near infrared. spectroscopy and cyclic voltammetry. The oxidation with antimony pentachloride or iron trichloride proceeds as a two‐step process; first, radical cationic (polaronic…
The effect of intergrain exchange and magnetostatic interactions on remanence and coercivity is calculated numerically for an isotropic Nd-Fe-B model magnet composed of 8000 grains. The intergrain exchange interaction affects the magnetizing process markedly when the grain size L is small, but the magnetostatic intera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOlefin epoxidation and alkane hydroxylation catalyzed by robust sulfonated manganese and iron porphyrins supported on cationic ion-exchange resinsSandro Campestrini and Bernard MeunierCite this: Inorg. Chem. 1992, 31, 11, 1999–2006Publication Date (Print):May 1, 1992Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembly of dinuclear helical and non-helical complexes with copper(I)Stephane Ruettimann, Claude Piguet, Gerald Bernardinelli, Bernard Bocquet, and Alan F. WilliamsCite this: J. Am. Chem. Soc. 1992, 114, 11, 4230–4237Publication Date (Print):May 1, 1992Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral micellar porphyrin fibers with 2-aminoglycosamide head groupsJuergen Hinrich Fuhrhop, Corinna Demoulin, Christoph Boettcher, Juergen Koening, and Ulrich SiggelCite this: J. Am. Chem. Soc. 1992, 114, 11, 4159–4165Publication Date (Print):May 1, 1992Publication History…
Abstract New aromatic polyimides containing triphenylamine unit were prepared by two different methods, i.e., a conventional two‐step method starting from 4,4′‐diaminotriphenylamine and aromatic tetracarboxylic dianhydrides and the one‐step thioanhydride method starting from the aromatic diamine and aromatic tetracarb…
Article On Ferromagnetic Ordering and Lattice Diffusion - A Simple Model / Uber ferromagnetische Ordnung und Gitterdiffusion Ein einfaches Modell was published on May 1, 1992 in the journal International Journal of Materials Research (volume 83, issue 5).
A thermochemical etching procedure, comprising a short chemical etch followed by a low‐temperature thermal anneal (typically 10 min at ≲70% of the sintering temperature), has proved successful for the preparation of alumina, aluminum nitride, and nickel zinc ferrite ceramics for micro‐structural studies. Good‐quality…