Materials Literature
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A novel method of function minimization that combines the power of the diagonal approximation to the normal matrix with conjugate directions is described. This method approaches closer to the local minimum than the methods that are commonly used in macromolecular refinement. The weakness of the current methods are ana…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCritical behavior and crossover scaling in symmetric polymer mixtures: a Monte Carlo investigationH. P. Deutsch and K. BinderCite this: Macromolecules 1992, 25, 23, 6214–6230Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inis…
Abstract Depending on the stoichiometry the alkali metal‐transition metal‐chalogenides crystallize analogous to the silicates in structures with isolated groups, chains or layers. The formation of the framework structures is realized by linkage of anionic transition metal‐chalcogenide complexes. – The magnetic propert…
A study was conducted at a mineral sands separation plant to evaluate the workplace performance of half-mask filter cartridge respirators. Inhalation exposure was estimated by measuring the dust and radioactivity concentration inside the respirator while it was worn or hanging around the worker's neck. The program pro…
Abstract Figures‐of‐merit (FOMs) is a term which is used to define the quantitative measure of performance based on parameters which can be determined by the experimentalist. The FOM may be intuitive , based on previous experience of the analyst or his personal assessment of the importance of certain parameters, or de…
Abstract Raman spectra of biaxial crystalline and amorphous poly( p ‐phenylene sulfide) (PPS) films were recorded using the micro‐Raman technique. The Raman spectra of its corresponding trimer and tetramer from KBr pellets and the infrared spectrum from the PPS film were also recorded in order to elucidate the normal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of cage reactions: kinetics of combination and diffusion after picosecond photolysis of iron(II) porphyrin ligated systemsTeddy G. Traylor, Douglas Magde, Jikun Luo, Kevin N. Walda, Debkumar Bandyopadhyay, Guo Zhang Wu, and Vijay S. SharmaCite this: J. Am. Chem. S…
Abstract The Part I of this series described a rapid method for determining the quality of carbon-black dispersion. The second paper (Part II) was concerned with the kinetics of the dispersion of carbon black into natural rubber (dispersion quality as a function of mixing time) in an internal mixer. In this paper we c…
In Lactobacillus plantarum non-allosteric L-lactate dehydrogenase (L-LDH), the highly conserved His188 residue, which is involved in the binding of an allosteric effector, fructose 1,6-bisphosphate [Fru(1,6)P2], in allosteric L-LDH is uniquely substituted by an Asp. The mutant L. plantarum L-LDH, in which Asp188 is re…
The influence of heat transfer on the propagation of acoustic disturbances in a gas–liquid foam of polyhedral structure is considered in this paper. The presence of quasiordered structure of microcapillaries (Plateau–Gibbs channels) results in the appearance of a hydrodynamic effect caused by liquid motion along the c…
Abstract Die Verbindung NaBa 2 Cu 3 O 6 wurde durch Reaktion von Na 2 O 2 , BaO 2 , Cu 2 O in geschlossenen Silberrohren erstmals dargestellt. An Einkristallen wurde die Kristallstruktur röntgenographisch aufgeklärt. NaBa 2 Cu 3 O 6 Kristallisiert orthorhombisch, Raumgruppe D ‐Fmmm mit a = 8,4229; b = 11,4418; c = 14,…
Boron carbide is used as a highly effective antioxidant in carbon‐containing refractories. The oxidation‐inhibiting action of this additive has not been clearly defined. The work first deals in theory with the stability of boron carbide at high temperatures. The practical section presents the reaction sequence as dete…
The spreading of smectic-A droplets on a smooth, high-energy surface has been studied using x-ray reflectivity, ellipsometry, and video imaging at the Brewster angle. These droplets have a layered structure and terraces are evidenced. The dynamics of expansion or retraction of these terraces are investigated and compa…
The motile diatom, Bacillaria paxillifer (O. F. Müll.) Hendy, shows a remarkable form of gliding motility in which entire colonies rhythmically expand and contract as single units. Cultures of Bacillaria grown under an alternating light/dark regime were found to exhibit rhythms in cell motility with the majority of co…
Abstract Electron paramagnetic resonance (EPR) at 9.205 GHz is examined for a series of Gd 3+ ‐doped alkali cadmium borosulphate (R 2 SO 4 · CdSO 4 · B 2 O 3 ; R = Li, Na, K or Cs) glasses. The spectra are similar to the U‐spectra familiar in many oxide, fluoride, and sulphate glasses, indicating very low and disorder…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of alkyl and fluoroalkyl radicals with nickel, iron, and manganese porphyrinsDirk M. Guldi, Manmohan Kumar, P. Neta, and Peter HambrightCite this: J. Phys. Chem. 1992, 96, 23, 9576–9581Publication Date (Print):November 1, 1992Publication History Published online1 M…
Methods for automatic structure determination [Pavelčík (1988). Acta Cryst. A44, 724–729] have been extended by routines utilizing Patterson peaks and a new version of the XFPS computer program [Pavelčík, Rizzoli & Andreetti (1990). University of Parma, Italy, and Komensky Univ., Bratislava, Czechoslovakia] has been d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of two new quaternary chalcogenides, CaYbInQ4 (Q = S and Se), with an olivine-type structureJames D. Carpenter and Shiou Jyh HwuCite this: Chem. Mater. 1992, 4, 6, 1368–1372Publication Date (Print):November 1, 1992Publication History Published…
Unexpectedly stable, 2 is the first mononuclear Ir II complex whose ligands are bound exclusively through C atoms. Complex 2 , prepared by oxidation of 1 with I 2 or Ag + , is close to square planar. The phenyl rings are almost perpendicular to the metal's coordination plane; the ortho Cl atoms are quite close to the…
The migration of subgrain boundaries and the development of the dislocation structure have been studied with the etch pit technique in the transient range of creep of pure <100>-oriented LiF single crystals after large stress reductions, which were performed in the steady state of compressive creep at 773 and 923 K (i…