Materials Literature
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Thermally-stimulated depolarization measurements on single-crystal specimens of KOH-doped ice have shown that the crystal structure of ice XI has ferroelectric ordering parallel to its c -axis. The charge-release peak identified with the detransformation of ice XI to ice Ih is produced at the 72 K transition temperatu…
The internal structure and orientation behavior of two series of spandex fibers, which were made with different spinning methods and different soft and hard segment types, were studied by FTIR (Fourier Transform Infrared Spectroscopy), polarizing light microscopy, and Instron. The orientation behavior of hard and soft…
The results of total energy, band structure, density of states and charge density calculations for lithium azide using an ab-initio technique of pseudo-atomic orbitals are presented. The computations are performed based on the density functional theory within a local density approximation applying the basis of sp3d5 p…
The dealloying of a Cu‐5 atom percent Au (Cu5Au) alloy was studied using coulometry, rotating disk electrode, transmission electron microscopy, selected area diffraction, and x‐ray diffraction techniques. The polarization behavior of Cu5Au is similar to that of pure Cu, showing no discernible passive region or critica…
Further developments are described for the dislocation mechanics based constitutive equation analysis previously used to describe the separate dynamic stress-strain behavior of fcc and bcc metal polycrystals. An enhanced hardening and ductility in copper and certain tantalum materials at higher strain rates in split H…
The postsynaptic molecule gephyrin is involved in clustering neurotransmitter receptors. To test for protein variants that correspond to alternatively spliced gephyrin mRNAs, antibodies were made against 1) an amino-terminal domain of gephyrin (GN(N)) and 2) its invariant carboxy-terminus (GN(C)). Both antibodies reco…
This paper is concerned with a new measuring method for impact tensile strength of brittle materials such as ceramics, concrete and so forth. The method is based on the superposition and concentration of tensile stress waves reflected both from the free ends of a specimen and a striking bar. By making use of the Hopki…
Other| August 01, 1997 A hydrous Ca-bearing magnesium carbonate from playa lake sediments, Salines Lake, Spain Ignasi Queralt; Ignasi Queralt Institute of Earth Sciences "Jaume Almera" (CSIC), Barcelona, Spain Search for other works by this author on: GSW Google Scholar Ramon Julia; Ramon Julia Search for other works…
The insecticidal activity, expressed by LD50 values, of acetone, ethanol, petroleum ether and water extracts of Calotropis procera leaves against the flesh fly, Sarcophaga haemorrhoidalis Fallen was evaluated in the laboratory. Based on LD50 values, ethanol extract was nearly 1.7, 1.3 and 1.3 times more toxic to larva…
Other| August 01, 1997 Thermochemistry and the enthalpy of formation of synthetic end-member (CaTiSiO5) titanite Dimitrios Xirouchakis; Dimitrios Xirouchakis State University of New York at Stony Brook, Center for High Pressure Research, Stony Brook, NY, United States Search for other works by this author on: GSW Goog…
A TiO 2 nanocrystallite has been modified to selectively bind, by complementary hydrogen bonding, a uracil substrate incorporating a viologen moiety. Bandgap excitation of the self-assembled donor (TiO 2 nanocrystallite)−acceptor (viologen) complex results in electron transfer. Some implications of these findings for…
Simultaneous Hall and conductivity measurements were performed in situ between 650° and 1050°C on n‐type semiconducting BaSnO 3 ceramics. The variation of the Hall mobility and the Hall carrier density as a function of oxygen partial pressure between 10 2 and 10 5 Pa and of temperature was investigated. At temperature…
The oxidation of CO on silica-supported hematite (Fe 2 O 3 ) was studied by the step−response method in a tubular fixed-bed reactor, at temperatures ranging between 270 and 350 °C. The oxidation process appeared to proceed through two stages. Firstly, oxygen atoms adsorbed on the surface of hematite react with gas pha…
The PZT polarization hysteresis characteristics in a Pt/PZT/Pt ferroelectric capacitor are degraded by annealing in a hydrogen-containing atmosphere due to the catalytic effect of the top Pt electrode. This can be avoided by using an IrO 2 /PZT/Pt capacitor structure as we proposed. During hydrogen annealing of the as…
Raman spectra and electrical conductivity of thin films of hydrogenated silicon with mixed amorphous-nanocrystalline phase composition have been studied. It is shown that interpretation of experimental data in terms of percolation theory permits one to determine the integrated Raman-scattering cross-section ratio of t…
A method was developed to prepare silver-doped sol–gel films for surface-enhanced Raman scattering (SERS) detection. The technique involves first doping silver ions as a silver ammine complex [Ag(NH3)2+] into a sol–gel matrix, followed by chemical reduction of the doped silver ions into the corresponding silver metal…
A series of Ga-substituted hydrotalcite-like compounds, [Mg 1 - x Ga x (OH) 2 ] (CO 3 ) x /2 · m H 2 O (where 0.07 ≤ x ≤ 0.36; GaHTs), were obtained in order to characterize their structural and crystal properties by means of X-ray diffraction and conventional/high-resolution electron microscopy. A linear relationship…
The optimized preparations and detailed spectroscopic characterization (solution and magic angle spinning nmr, infrared, FT-Raman, powder XRD, mass spectrometry) of the octasilsesquioxane cage compounds X 8 Si 8 0i2 (X = H, CH=CH 2 , OSiMe 2 H, and OSiMe2Br) and the ionic compound {NMe 4 } 8 {Si 8 02o}.60H 2 0 are des…
Abstract Durch basischen Aufschluß von Ta 2 O 5 mit p. a. KOH erhält man durchsichtige Einkristalle der Zusammensetzung K 8 Ta 6 O 19 · 16H 2 O. Der Einsatz von technischer KOH dagegen führt beim gleichem Synthese‐Verfahren zu Einkristallen der Zusammensetzung K 7 NaTa 6 O 19 · 14H 2 O, einer Verbindung, die in der Li…
CdSe thin films deposited chemically on glass substrates for 4, 8, and 16 h, and subsequently annealed at 400 °C for 1 h, have been studied by a combination of spectroscopic (photoluminescence and Raman scattering) and structure-determining (x-ray diffraction and atomic force microscopy) techniques. Due to a size dist…