Materials Literature
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The refractive index of the polymer np is adjusted relative to the ordinary refractive index of dispersed droplets of nematic liquid crystal no to regulate the angle of maximum transmission through a film in the presence of an applied field. Maximum transmission occurs at normal incidence when np≤no with the breadth o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlgorithms for the identification of three-dimensional maximal common substructuresAndrew T. Brint and Peter WillettCite this: J. Chem. Inf. Comput. Sci. 1987, 27, 4, 152–158Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inis…
Abstract Using three methods to attempt to identify the presence of ester‐linked porphyrins in Photofrin® II, lithium aluminum hydride reduction, basic hydrolysis and proton NMR. it can be concluded that 40‐50% of such linkages are present. The majority of the remaining material is cleaved by acid hydrolysis, which is…
Solubility of NiO in Al 2 O 3 was determined by electron probe microanalysisy A diffusion couple method was used by coupling an NiO‐doped Al 2 O 3 polycrystal to a pure single crystal of Al 2 O 3 . The solubility of NiO in Al 2 O 3 in air was 230 wt ppm (157 at. ppm of cations) and 170 wt ppm (116 at. ppm) at 2073 and…
Abstract Für Bauteile, die mit Benzin, Kerosin und Mineralölen in Kontakt kommen, werden in zunehmendem Maße organische Werkstoffe eingesetzt, wie z.B. hochdichtes Polyethylen, Phenolharze, Polyamide, Polyester, Acrylharze, Epoxy‐ und Fluorcarbonharze, allein oder als Verbundwerkstoffe mit Glas‐, Kohlenstoff‐ und Aram…
Introduces students to X-ray photoelectron spectroscopy, the chemical information revealed by the "chemical shift", the surface sensitivity of the technique, and the enhancement of composite data by employing nonlinear least-squares curve-fitting routines.
Abstract The Raman and infrared spectra of NiCl 2 ·6H 2 O, NiCl 2 ·6D 2 O, CoCl 2 ·6H 2 O, CoCl 2 ·6D 2 O and CoBr 2 ·6H 2 O single crystals have been measured in the range 3600–30 cm −1 (Raman) and 3800–400 cm −1 (IR). The water internal modes have been best assigned for NiCl 2 ·6H 2 O, including Fermi resonance effe…
Powder neutron-diffraction experiments at pressures up to 8.2 kbar and temperatures down to 0.3 K have been performed on the antiferromagnetic ternary compound ${\mathrm{Tm}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{Si}}_{5}$. For pressures between 2 and 21 kbar, this system becomes superconducting at ${T}_{c1}>{T}_{N}$, w…
A constitutive relation is formulated for coated fabrics that exhibit both elastic and inelastic, but time‐independent, responses. The nonlinear orthotropic response is represented by an elastic portion related to yarn stretch and coating shear, and an inelastic part related to crimp interchange. A method is proposed…
ABSTRACT The stability of glutamine and pyroglutamic acid as regards pH, temperature and oxygen was studied during storage and two thermal processings, the residual products and those which appeared being determined. Contrary to glutamic acid, the two derivatives are labile below pH 2 and above pH 13 and alteration oc…
It has recently been reported that 8S clathrin trimers or "triskelions" form larger 27S oligomers upon dialysis into low ionic strength buffers (Prasad, K., R. E. Lippoldt, H. Edelhoch, and M. S. Lewis, 1986, Biochemistry, 25:5214-5219). Here, deep-etch electron microscopy of the 27S species reveals that they are clos…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBreakdown of passivity and localized corrosion processesH. BoehniCite this: Langmuir 1987, 3, 6, 924–930Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November 1987https://doi.org/10.1021/la00078a010RIGHTS & PERMISS…
Abstract CB facilitates strain-induced crystallization and increases the size of the crystallized zone at the stressed crack tip. Both effects are major reinforcement mechanisms that increase the fracture resistance of CB-reinforced NR.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(dimethylsiloxane-co-diphenylsiloxanes): synthesis, characterization, and sequence analysisG. N. Babu, S. S. Christopher, and R. A. NewmarkCite this: Macromolecules 1987, 20, 11, 2654–2659Publication Date (Print):November 1, 1987Publication History Published online1 May…
Simulations of the switching behavior in a ferroelectric liquid crystal were carried out with the model proposed by Handschy and Clark. There appear to be various types of switching processes for changing surface anchoring force. Results of simulations are compared with experimental observations, some of which seem to…
The autotroph Methanococcus maripaludis contained high levels of acetate-coenzyme A ligase, pyruvate synthase, pyruvate, water dikinase, pyruvate carboxylase, and the enzymes of the incomplete reductive tricarboxylic acid cycle. Phosphoenolpyruvate carboxykinase, citrate synthase, and isocitrate dehydrogenase were not…
Polythiophene and polybithiophene polymer films were deposited on platinum, tungsten, and glassy carbon electrodes by anodic oxidation of the monomer in ambient temperature molten salts, consisting of a mixture of aluminum chloride and 1‐methyl‐3‐ethyl‐imidazolium chloride. The formation reaction of polythiophene and…
Nitrogen (N) has been shown to exert a beneficial influence on localized corrosion resistance of austenitic stainless steels. With duplex stainless steels (SSs), N plays a dual role of controlling the austenite to ferrite ratio and increasing corrosion resistance. In addition, on rapid cooling from high temperatures,…
Abstract Kinetics of K release were investigated on a Kenansville loamy sand (loamy, siliceous, thermic Arenic Hapludults), a Rumford loamy sand (coarse‐loamy, siliceous, thermic Typic Hapludults), and a Sassafras fine sandy loam (fine‐loamy, mixed, mesic Typic Hapludults) from the Delaware Coastal Plain. Previous fie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia-catalyzed silylation reactions of Cab-O-Sil with methoxymethylsilanesJ. P. Blitz, R. S. Shreedhara Murthy, and D. E. LeydenCite this: J. Am. Chem. Soc. 1987, 109, 23, 7141–7145Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Publ…