Materials Literature
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High-intensity femtosecond pulses tunable in the 0.8–1.6-μm range have been generated by parametric amplification of a continuum white light in a new organic crystal, N-(4-nitrophenyl)-L-prolinol (NPP). The traditional concept of noncritical phase matching was revised in view of requirements linked to the observation…
Off-axis uniaxial testing is used to characterize the nonlinear behavior of boron/ aluminum composite. An orthotropic elastic-plastic formulation is used.
X-ray scattering carried out in situ during electrochemical doping indicates an unusual sequence of structural transitions. On doping to \ensuremath{\approx}6-7 mole%, lightly doped regions coexist with a discommensurate-domain channel structure. As the Na concentration increases, the density of domain walls decreases…
Abstract A new quantitative X-ray powder diffraction (QXRPD) method has been developed to analyze polyphase crystalline mixtures. The unique approach employed in this method is the utilization of the full diffraction pattern of a mixture and its reconstruction as a weighted sum of diffraction patterns of the component…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrescription for stabilization of ferromagnetic exchange in molecular solids via admixing of the ground state with a virtual charge-transfer excited stateJoel S. Miller and Arthur J. EpsteinCite this: J. Am. Chem. Soc. 1987, 109, 13, 3850–3855Publication Date (Print):June 1,…
We consider front formation and steady-state front motion in a one-dimensional polymer system undergoing case-II diffusion. The polymer system approximates a polymer sheet whose thickness is very small compared with its lateral dimensions. The osmotic pressure of Thomas and Windle (TW) is used in the theoretical analy…
Abstract The extent of oxidation of ethyl esters of eicosapentaenoic (EPA) and docosahexaenoic acids (DHA) was compared quantitatively with that of ethyl linoleate (Lo) and ethyl linolenate (Ln) by oxygen uptake and formation of conjugated diene, hydroperoxide and secondary oxidation products. EPA and DHA esters were…
A systematic study of the effects of polymer surface properties on the interaction with human endothelial cells (HEC) may lead to the development of small-diameter vascular grafts. HEC, suspended in culture medium containing 20% serum adhered and spread onto moderately wettable polymers such as TCPS (tissue culture po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase transition of submicron gel beadsYoshiharu Hirose, Takayuki Amiya, Yoshitsugu Hirokawa, and Toyoichi TanakaCite this: Macromolecules 1987, 20, 6, 1342–1344Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 June 1987ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOlefin epoxidation by manganese (IV) porphyrins: evidence for two reaction pathwaysJohn T. Groves and Michael K. SternCite this: J. Am. Chem. Soc. 1987, 109, 12, 3812–3814Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 J…
The semiconductive properties of the passive film formed on iron were investigated by measuring the impedance of passivated iron electrodes in neutral borate and phosphate solutions. Mott‐Schottky type of plot was applied to the impedance data to obtain the donor density and the flatband potential as a function of fil…
The defect chemistry in boundary regions of ionic crystals is considered from a thermodynamic point of view. The related effects on the ionic conductivity of two‐phase mixtures and other heterogeneous systems are discussed. Experimental and theoretical findings are critically reviewed. The concept of the formation of…
Key aspects of anodic film growth on aluminium at ambient temperatures in aqueous electrolytes, encompassing barrier- and porous-type films, are described. By direct observation of film sections, incorporating inert marker layers and tracers, in the transmission electron microscope and appropriate analysis, the locati…
The effects of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and 1-methyl-4-phenylpyridinium ion (MPP+) on activities of enzyme complexes in the electron transport system were studied using isolated mitochondrial preparations from C57BL/6J mouse brains. Both MPTP and MPP+ dose-dependently inhibited activity of N…
Abstract Rheological properties, extrusion, fiber spinning, compression, and injection molding of blends of polycarbonate and two thermotropic liquid crystal polymers based on wholly aromatic copolyesters have been studied. Blends were prepared using an internal Banbury mixer and static Koch mixer. Based upon differen…
Subtilisin E, an alkaline serine protease of Bacillus subtilis 168, is first produced as a precursor, pre-pro-subtilisin, which consists of a signal peptide for protein secretion (pre-sequence) and a peptide extension of 77 amino acid residues (pro-sequence) between the signal peptide and mature subtilisin. When the e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly-p-phenyleneamineimine: synthesis and comparison to polyanilineF. Wudl, R. O. Angus Jr., F. L. Lu, P. M. Allemand, D. Vachon, M. Nowak, Z. X. Liu, H. Schaffer, and A. J. HeegerCite this: J. Am. Chem. Soc. 1987, 109, 12, 3677–3684Publication Date (Print):June 1, 1987Publi…
Catalysis and combustion have long been linked. In fact, the science of catalysis stems from Davy's discovery [1] that platinum wires could promote the flameless combustion of flammable fuel-air mixtures. Today, catalysis is a mainstay of our modern chemical industry. Oxidation catalysts are used not only for the comp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-property behavior of new hybrid materials incorporating oligomeric species into sol-gel glasses. 3. Effect of acid content, tetraethoxysilane content, and molecular weight of poly(dimethylsiloxane)Hao Hsin Huang, Bruce Orler, and Garth L. WilkesCite this: Macromole…
Photoemission studies of (${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Sr}}_{\mathrm{x}}$${)}_{2}$${\mathrm{CuO}}_{4\mathrm{\ensuremath{-}}\mathrm{y}}$ and ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6.7}$ have revealed that their electronic structure is essentially that of a Mott insulator,…