Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCadmium sulfide-particle-mediated transmembrane photoelectron transfer in surfactant vesiclesOtto Horvath and Janos H. FendlerCite this: J. Phys. Chem. 1992, 96, 24, 9591–9594Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published ini…
The microstructure of ethylene/vinyl chloride (E/VC) copolymers, prepared by partial reduction of PVC with a variety of reagents, was analyzed using carbon-13 NMR spectroscopy. The effect of the reduction mechanism on the microstructure and stereochemistry of the copolymers was studied. The reduction with tri-n-butylt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility in blends of copolymers: sequence distribution effectsChai Zhikuan, Sun Ruona, and Frank E. KaraszCite this: Macromolecules 1992, 25, 23, 6113–6118Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November…
We present the results of the experimental studies of the low temperature transport and magnetic properties of PbTe, Pb1-xSnxTe (x < 0.3) and SnTe crystals doped with 0.5 at.% of chromium. Cr was found to be a resonant donor in PbTe and PbSnTe. Magnetic susceptibility measurements revealed that PbTe:Cr and Pb1-xSnxTe:…
The effect of strain rate on tensile and compressive mechanical properties of sheet steels is investigated experimentally and analytically. Three sheet steels are studied in both longitudinal and transverse directions under different strain rates and different amounts of prior cold stretching. In order to determine th…