Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSolvent-Dependent Swelling of Poly(amido amine) Starburst DendrimersStefan Stechemesser and Wolfgang EimerView Author Information Department of Chemistry, University of Bielefeld, P.O. Box 10 01 31, D-33 501 Bielefeld, GermanyCite t…
Other| April 01, 1997 Crystal structure of monoclinic hydrous wadsleyite [β-(Mg,Fe)2 SiO4 ] Joseph R. Smyth; Joseph R. Smyth University of Colorado, Department of Geological Sciences, Boulder, CO, United States Search for other works by this author on: GSW Google Scholar Tatsuhiko Kawamoto; Tatsuhiko Kawamoto Search f…
The use of the split Hopkinson pressure bar (SHPB) techniques for materials testing under a high rate of loading is described, including various modifications of the original compression testing set-up for tension testing, torsion testing and dynamic fracture testing. Details of measurement techniques and instrumentat…
Total energies, electronic structure, surface energies, polarization, potentials and charge densities were studied for slabs of BaTiO3 using the Linearized Augmented Plane Wave (LAPW) method. The depolarization field inhibits ferroelectricity in the slabs, and the macroscopic field set up across a ferroelectric slab i…
We present an investigation of the mechanisms of mechanical reinforcement at interfaces between polypropylene (PP) and polyamide-6 (PA6), associated with the incorporation of a small amount of maleic anhydride functionalized PP (PP- g -MA) which reacts with the NH 2 groups of the PA6 to form a copolymer in situ. In a…
The pressure dependence of the 100 K spin-state transition in LaCoO 3 is investigated through magnetization measurement under pressures of up to 18.2 kbar. The energy gap, Δ, between the low-spin ground state and the excited magnetic state (intermediate spin) increases remarkably with increasing pressure. The linear p…
Dielectric relaxation processes in an antiferroelectric liquid crystal (AFLC) have been investigated over a wide range of frequencies from 1 Hz to 1 GHz. The AFLC under investigation possesses a variety of different ferrielectric, ferroelectric, and antiferroelectric phases. Dielectric and polarization measurements un…
By use of low-temperature (20 K) confocal microscopy, fluorescence spectra of isolated single CdS nanocrystals have been recorded. The narrowest measured line width of the main fluorescence band has been determined to be about 5 meV at the lowest excitation intensities. At higher intensities at least three additional…
Evolutionary analysis indicates that eubacterial NADP-dependent isocitrate dehydrogenases (EC 1.1.1.42) first evolved from an NAD-dependent precursor about 3.5 billion years ago. Selection in favor of utilizing NADP was probably a result of niche expansion during growth on acetate, where isocitrate dehydrogenase provi…
We report a study of the physical and electrochemical properties of two-component self-assembled monolayers (SAMs) composed of both electroactive (4-aminothiophenol, 4-ATP) and electroinactive ( n -octadecanethiol, ODT) species. In all of the experiments reported here, relatively short (3 h) assembly times were used t…
Single‐phase perovskite 0.9Pb(Mg 1/3 Nb 2/3 )O 3 ‐0.1PbTiO 3 (0.9PMN–0.1 PT) from a stoichiometric mixture of starting materials was synthesized by applying a mechanochemical technique to the stage of a precursor. A stoichiometric mixture of PbO, TiO 2 , Mg(OH) 2 , and Nb 2 O 5 was milled for 60 min and heated at temp…
The xpt and pbuX genes from Bacillus subtilis were cloned, and their nucleotide sequences were determined. The xpt gene encodes a specific xanthine phosphoribosyltransferase, and the pbuX gene encodes a xanthine-specific purine permease. The genes have overlapping coding regions, and Northern (RNA) blot analysis indic…
Yttria–doped ceria powder was prepared from oxalate precursors. The oxalate coprecipitation bath parameters were closely monitored and found to influence the sintering behavior of the subsequently obtained oxide powders strongly. The use of concentrated (Ce,Y) metal nitrate solutions and dilute neutralized oxalic acid…
Novel amphiphilic glucamine derivatives have been synthesized. These are N-benzoyl-1-deoxy1-methylamino-D-glucitols and N-benzoyl-1-amino-1-deoxy-D-glucitols carrying one, two or three aliphatic chains (CnH2n 1O- with n 3, 6 and 12) grafted to the benzamido group. The thermotropic mesophases of these compounds were st…
The low-temperature specific heat of single crystals of \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$ Cu[N(CN${)}_{2}$ ]Br was studied in the temperature range between 0.11 and 4.5 K. The electronic specific heat, ${\mathrm{C}}_{\mathrm{el}}$, in the superconducting state shows a quadratic temperature dependence that is most…
In situ FT-IR spectroscopy has been used to study poly(methyl methacrylate) films subjected to high-pressure and supercritical CO 2 . Spectral changes indicate increased molecular mobility of ester groups due to the plasticization effect of CO 2 on PMMA. This increase in PMMA segmental mobility has been used to impreg…
The Seventh Annual Conference on Flame Retardancy was held in International Plaza Hotel in Stamford, Connecticut, USA on May 20-22, 1996, As before it was organized and sponsored by Business Communications Company (BCC). Scientists from 15 countries (USA, Canada, Germany, Israel, Russia, Belorussia, Italy, UK, China,…
There has been growing interest in the use of materials with the perovskite structure as a dielectric for capacitors in dynamic random access memory chips. The heightened activity in this field is exemplified by the nearly exponential increase in the number of patents issued during the past 5 years. At the present tim…
In order to study nature of the electronic structures in manganites, the effective Hamiltonian is derived by taking the degeneracy of the ${\mathrm{e}}_{\mathrm{g}}$ orbitals and the strong electron correlation into account. The spin and orbital ordered phases in the insulating states are studied in the mean-field app…
Abstract Under laboratory conditions, there were detected burning products of pyrotechnic compositions based on red phosphorus with epoxy resin being especially trihydrogenphosphoric acid, tetrahydrogendiphosphoric acid and mixture of cyclo ‐triphosphoric acid, cyclo ‐tetraphosphoric acid and cyclo ‐hexaphosphoric aci…