Materials Literature
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A mechanism-derived lumping strategy for modeling the acid-cracking kinetics of hydrocarbon mixtures based on a limited set of pure component experimental data was tested in terms of its ability to predict the kinetics and product spectra from the reaction of a 1-phenyloctane/ n -hexadecane mixture. The modeling appro…
Results are presented of an EPR study of theO − hole center in LiB 3 O 5 (lithium triborate) crystals. Analysis of angular dependences of EPR spectra is used to determine the principal values of the g tensor ( g XX =2.032, g YY =2.020, g ZZ =2.007), along with the modulus of the isotropic part of the A 2 tensor (| A |…
When heat treated, amorphous alumino-silicate fibres will devitrify into crystalline phases which on cooling become stable at room temperature. X-ray diffraction has been used to identify and quantify the phases present in such products; mullite and two distinct forms of cristobalite have been observed. One form of cr…
The synthesis and nitrogen oxide (NO) removal activities of composite powders in the copper‐lanthanum‐alumina(Cu‐La‐Al 2 O 3 )system were studied, in regard to their high‐temperature application as an automotive lean‐burn exhaust catalyst. The solid‐state reaction between the copper, the lanthanum, and the Al 2 O 3 su…
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire H…
The total elimination of air represents a serious hurdle in modified atmosphere packaging of bakery products, due both to the high spin-rates of the packaging lines and, particularly, to the typical texture of bakery products which retain large quantities of air inside their porous structure. Simulating the gas-flushi…
A technique of measuring basic Landau-expansion coefficients in ferroelectric liquidcrystals is proposed. The method is based on combined measurements of the tilt angle andthe total polarization of ferroelectric liquid crystals at various temperatures and electric field strength in the vicinity of the ferroelectric S*…
Abstract The molecular dynamics of dendrimer branches were studied by observing the excimer formation of pyrenyl end‐groups. By a selective synthesis only one pyrene moiety per dendron was attached, resulting in a dendrimer with 3 fluorophors per molecule. The first 3 generations of the dendrimer were synthesized by t…
Swelling measurements in six organic solvents were carried out on samples of dicumyl peroxide crosslinked ethylene–propylene–diene (EPDM) having various crosslink densities. The Flory–Huggins interaction parameter χ was determined for EPDM vulcanizates 312 and 812 as well as their mixture 312/812 using the Flory–Rehne…
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…