Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Pregnane Glycosides from Caralluma tuberculataViqar Uddin Ahmad, Khan Usmanghani, and Ghazala H. RizwaniCite this: J. Nat. Prod. 1988, 51, 6, 1092–1097Publication Date (Print):November 1, 1988Publication History Published online1 July 2004Published inissue 1 November 198…
A design is presented of a high-angle fully eucentric tilting stage (±45. ±23° around two orthogonal axes) for a transmission electron microscope. The concurrent design of suitable objective-lens pole pieces has been made in order to get the best compromise between electron optical performances and the difficulties in…
The advantages of piezoelectric actuators are often opposed by one decisive handicap: their high control voltage. Piezoelectric multilayer ceramics do not show this disadvantage. Their highest possible deflection can be gained with voltages between 5 and 15 V which are common in today's electronics.
Summary Two model compounds, n-dodecylpyridinium bromide (n-DDPB) and l-octyn-3-01, were tested in HCI acid as inhibitors for J55 oilfield steel. This paper describes the kinetic and chemical analyses conducted to arrive at inhibition mechanisms for these model compounds. These studies show that the pyridinium forms a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen-derived peroxo-alkyl complexes of permethyltantalocene. Structural characterization of (.eta.5-C5Me5)2Ta(.eta.2-O2)(CH2C6H5) and acid-catalyzed rearrangement to oxo-alkoxide derivativesAllan. Van Asselt, Mark S. Trimmer, Larry M. Henling, and John E. BercawCite this…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear optical properties of organic molecules. 7. Calculated hyperpolarizabilities of azulenes and sesquifulvaleneJohn O. MorleyCite this: J. Am. Chem. Soc. 1988, 110, 23, 7660–7663Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Pub…
A tissue-specific casein kinase, purified from the Golgi-enriched-membrane fraction of guinea-pig lactating mammary gland (GEF-CK), readily phosphorylates the synthetic peptide Ser-Glu5, a good substrate of casein kinase-2, and several derivatives varying for the number and position of acidic residues on the C-termina…
An Au cluster with an unusual structure, the dication 1, is formed in the polyauration of 2,4,4-trimethyl-4,5-dihydrooxazole. The expected dihydrooxazole with a peraurated 2-methyl group reacts further with excess Ph3PAuCl/CsF under Au1-incorporation to give 1. The highly aurated C atoms are trigonal-bipyramidally coo…
Abstract Using combined optical‐spectroscopic and transport investigations it is succeeded for the first time to determine all relevant valence band data for the whole series of mixed crystals (Bi 1− x Sb x ) 2 Te 3 (0 ≦ x ≦ 1). The reflectivity of polarized infrared light including its anisotropy is measured in the w…
Abstract The nonlinear viscoelastic behavior of glassy polymers and its relationship to ductile yielding is studied by single‐ and double‐step stress relaxation experiments. In the latter case a small stress relaxation step is superimposed on a specimen at an elevated state of temperature or strain. The results show t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of crosslinks on the phase separation behavior of a miscible polymer blendRobert M. Briber and Barry J. BauerCite this: Macromolecules 1988, 21, 11, 3296–3303Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 Nov…
Abstract Acrylonitrile‐butadiene rubber having carboxylic acid groups (XNBR) and polystyrene having oxazoline groups, were melt blended in a Rheomix mixer under optimized conditions, The ratio of rubber to polystyrene phase was kept constant at 1:4 by weight. The concentration of the reactive oxazoline groups in the p…
Iron(II) and nickel(II) [MN6]X2 type complexes have been prepared from 2-(pyrazol-1-yl]pyridine (1pp), 2-(pyrazol-1-yl) imidazoline (pi), 2- (pyrazol-3-yl)pyridine (3pp) and 2,6-bis(pyrazol-3-yl)pyridine ( bpp ). Variable-temperature magnetic and Mossbauer spectral studies establish that [Fe(1pp)3]X2 is low spin and […
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing currents in wholly inorganic heteropoly blue complexes. Evaluation by a modification of Evans' susceptibility methodMariusz. Kozik, Nieves. Casan-Pastor, Charles F. Hammer, and Louis C. W. BakerCite this: J. Am. Chem. Soc. 1988, 110, 23, 7697–7701Publication Date (Print…
Microdeformation characteristics in alloy 600 tubing have been examined after various tensile deformations. Microstructure developed during processing was found to control subsequent microdeformation behavior. Grain boundary carbides were the most effective source of dislocations, activating at lower macrostrains and…
Abstract Inhibition of the corrosion of iron in hydrochloric acid solutions by amino acids was studied. Twenty‐two different common amino acids and four related compounds were used. Potentiodynamic polarization curves were obtained for iron wire in deaerated 1 M hydrochloric acid solution. Intersection of the linear T…
A comprehensive theory has been developed to describe all manifestations of Coulomb interactions between charged particles in low- and medium-density nonrelativistic beams, e.g., as found in electron beam pattern generators and scanning electron microscopes. A survey is given of the analytical prescriptions for the ca…
Abstract A series of experiments have been run to determine which mechanisms dominate carbon black reinforcement of rubber. A broad range of compounds using oil-extended and non-oil-extended rubbers and carbon blacks covering the spectrum of tread blacks have been tested. The results for measurements made in an all-SB…
Abstract The adsorbate formed during ethanol oxidation in acidic solutions is studied by Fourier transform infrared reflection‐absorption spectroscopy (FTIR) at constant potential, on‐line (DEMS) and thermal desorption mass spectroscopy (ECTDMS). – As in the case of methanol adsorbate CO ad was identified by FTIR and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state carbon-13 NMR characterization of polyanilinesS. Kaplan, E. M. Conwell, A. F. Richter, and A. G. MacDiarmidCite this: J. Am. Chem. Soc. 1988, 110, 23, 7647–7651Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissu…