Materials Literature
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The ternary compound Ti3SiC2 possesses an unusual combination of metallic and ceramic properties, such as, high electrical conductivity, good oxidation resistance and remarkable refractoriness. Stoichiometric mixtures of the elemental Ti, Si and C powders were heated under various conditions and the reactions among th…
Reactions of 2,6-diphenylphenol (HOdpp) and rare earth metals, in the presence of mercury, at elevated temperatures in sealed tubes followed by extraction with toluene yielded homoleptic tris(aryloxo)lanthanoid(III) complexes, [Ln(Odpp)3] (Ln = Y (1), La (2), Ce (3), Pr (4), Nd (5), Gd (6), Ho (7), Er (8), Lu (9)). Si…
Metal capped carbon nanotubes, prepared by catalytic decomposition of benzene, have been applied as a magnetic force microscope tip. The particles at the end of nanotubes were about 35 nm in diameter, which were found to be Ni3C from the electron diffraction pattern. The other end of the nanotubes was attached on the…
In acetone and at ambient temperature, the dinuclear manganese complex of TPTN is able to catalyse the oxidation of several alkenes to the corresponding epoxides with high turnovers numbers (up to 900) using H2O2 as oxidant.
Polyaniline–emeraldine base (EB) fiber with excellent mechanical and electrical properties have been spun from highly concentrated (20% w/w), EB/N-methyl-2-pyrrolidinone (NMP)/2-methylaziridine (2 MA) solution. These solutions had gelation times, which varied from hours to days depending on the molar ratio of 2 MA to…
We report detailed measurements of the interlayer magnetoresistance of the layered organic superconductor $\ensuremath{\kappa}--(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}(\mathrm{SCN}{)}_{2}$ for temperatures down to 0.5 K and fields up to 30 T. The upper critical field is determined from the resistive…
The response of archaea to changes in external NaCl is reviewed and compared to what is known about osmoadaptation and osmoregulation in bacteria and eukaryotes. Cells placed in altered external NaCl exhibit short term and long term responses. The earliest events are likely to be water movement through aquaporin-like…
The paper presents recent work on ferromagnetic NiMnGa films sputter deposited on silicon cantilever substrates. The films are partially crystalline if the substrate is held at room temperature (RT) during the deposition. They become fully crystalline after annealing at 400°C. The internal friction (IF) of the RT depo…
The synthesis, X-ray crystal structures and magnetic properties of the 1-D polymeric coordination compound MnII(NITpPy)4[N(CN)2]2 (NITpPy = 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide) are reported. In the crystal structure the [MnII(NITpPy)2]2+ units are linked by N(CN)2− μ-bridging ligands to form on…
Recent works on perpendicular recording media were reviewed, Co-Cr alloy films are still under improvment and show a recording ability of 20 Gbit/in/sup 2/ and beyond. New perpendicular recording media that have high perpendicular anisotropy have been developed. These would be candidate media for ultrahigh density rec…
In crystals of [FeII(N3)2(pyz)]n (pyz = pyrazine), two adjacent Fe2+ ions are bridged via two μ-1,1-N3− ligands along the c axis to afford ferromagnetically coupled linear chains, which are bridged via μ-pyrazine ligands along the b axis to afford 2-D antiferromagnetically coupled layers; these competitive magnetic co…
Mesostructured films deposited on glass substrates by spin coating are studied by X-ray diffraction, small angle X-ray scattering using grazing incidence (GISAXS) and high resolution electron microscopy. The films generally present a gradient of ordering from the air/sol interface to the interior of the film, with a 3…
We report the latest release (version 1.6) of the CATH protein domains database (http://www.biochem.ucl. ac.uk/bsm/cath ). This is a hierarchical classification of 18 577 domains into evolutionary families and structural groupings. We have identified 1028 homo-logous superfamilies in which the proteins have both struc…
We propose a theory for the phase transitions in materials made from natural fibers. At heating, the theory predicts structural phase transitions of the first order. The normalized thermodynamical characteristics show the universal behavior of a scaling law, which is unusual for first order phase transitions The scali…
In the recent decade, the most useful drug for the therapy of colon cancer is 5-Fluorouracil(5-FU). It has been reported to have considerable toxicity administered by intravenous injections or via alimentary treat. Though many materials have developed for drug carrier of 5-FU, there was no clinically acceptable carrie…
Measurements of hysteresis loops, initial magnetization curve and families of differential permeability curves were made on a series of 0.05 and 0.1 wt.% C Fe-C samples subjected to fatigue under load control. Preisach-like functions were calculated using the permeability data. Based on these functions a new parameter…
This article reports on an investigation into how the morphology of four commercially available ethylene propylene diene monomer (EPDM) elastomers was affected by exposure to a brake fluid. The sorption and diffusion coefficients as a function of carbon-black content as well as the EPDM type were determined at 23°C, 6…
It is well known that the difference in the coefficient of thermal expansion of the components of titanium matrix composites with the SCS-6 SiC-fiber gives rise to substantial residual stresses. Due to the fact that the fiber/matrix bond strength is low (as long as there is still a substantial thick carbon protection…
The reaction between iron oxides and iron‐carbon melts was studied in the temperature range 1523–1973 K. Pellets made from three different sources of iron oxides were added onto the melt surface, and the reaction time was measured through the constant volume pressure increase (CVPI) method. The effects of reaction tem…
Oxynitride deep-ultraviolet antireflective coating (DARC) of Si wafers is used to get better lithography at 248 nm. The thickness and the optical parameters of these films have to be optimized to get good and reproducible results. In this context, DARC layers with different N2O flows have been processed and characteri…