Materials Literature
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An influence of the alloy content of nickel and silicon on the precipitation kinetics and precipitation hardening mechanism in Cu-Ni-Si alloys has been studied.The degree and the rate of precipitation and the hardness change in the precipitation process increase with increasing an alloying elements. The degree and the…
Is it possible to make artificial materials that match or exceed the “hardness” of the two hardest known materials – diamond and cubic boron nitride? This question has long been of both basic and technological interest. Considerable excitement therefore greeted the recent theoretical prediction that the short, strong…
Zinc oxide nonlinear resistors with double the conventional reference voltage gradient, while improving their protective characteristics and raising discharging capability, were developed and applied to tank-type surge arresters. On the basis of high-performance elements, which provide good protective characteristics,…
The synthesis of 1a·(32 – n)Na+·ca. 600 H2O·ca. 30 CH3OH 1 containing the ring-shaped, mixed-valence (MoV/MoVI) cluster [(MoO3)176(H2O)63(CH3OH)17Hn](32 – n)– 1a as a discrete unit in the crystal lattice is reported, which for the first time yields a compound of this type via a facile synthetic method and without amor…
Starting from 1,4:3,6-dianhydrosorbitol (DAS, 1), a five step monomer synthesis led to 2-deoxy-1,4:3,6-dianhydro-2-isocyanato-L-iditol, 9, which by catalytic polyaddition gave polyurethane 13. A second route required the synthesis of 2-azido-5-O-chloroformyl-2-deoxy-1,4:3,6-dianhydro-L-iditol, 11. During catalytic hyd…
We have synthesized nine novel porphyrin derivatives, 1-8 and 1-Cu, substituted with various steric hindrance groups and long flexible chains in order to investigate the relationship between the molecular type of porphyrin derivatives and the resulting mesophase. Type 4 disc-like (C 12 O) 16 -TTPH 2 (1) and (C 12 O) 1…
Contents: Fire and fire safety; Flame retardants markets; Major flame retardant applications; Course of a fire; Combustion process; Mode of action of flame retardants; Halogen-containing flame retardants; Phosphorus containing flame retardants; Nitrogen containing flame retardants; Inorganic flame retardants; The role…
Supercritical fluid extraction was used to extract and recover >90% of the surfactant template from the pores of as-synthesized pure siliceous MCM-41 and the MCM-41 after supercritical fluid extraction shows more uniform pore size distribution than the calcined MCM-41.
A new bulk matrix correction program for quantitative electron probe microanalysis based on a double Gaussian φ(ρz) approach is presented. The independent input parameters for this new model are α (decay rate in the right-hand Gaussian), surface ionization φ(0), peak position (ρzm) and integral of φ(ρz) (FI). The Gaus…
In contrast to metalloporphyrins with non-electroactive metal centres, the π-cation radicals of porphyrin free bases (H2OEP, H2TPP, H2CdiE) electrogenerated in strictly anhydrous solvents are not stable and give rise to a quantitative chemical reaction. Conjunction of electrochemical and spectroscopic data (UV/VIS, EP…
Z. Qi and P. G. Pickup, Chem. Commun., 1998, 2299 DOI: 10.1039/A805322G
This paper describes the development of /spl plusmn/250 kV DC XLPE cables. Through a series of material investigations and the evaluation of model cables using two kinds of XLPE compound containing inorganic filler to suppress the accumulation of space charge within XLPE insulation, /spl plusmn/250 kV DC XLPE cables a…
Introduction to Physics of Warheads Against Ballistic Missiles - Fragmentation Warhead Principles - Premade Fragment Warheads - Kinetic Energy Rod Warheads - Direct Energy Warheads - Blast Warhead Concepts - Direct Hit Modeling with Missile Debris Considerations - Terminal Encounter Kinematics - Target Detection Mecha…
Time‐resolved reflectivity (TRR) measurements have been used to determine the growth kinetics of both the amorphous‐to‐γ‐phase and the γ‐to‐α phase transformations of alumina films that have been deposited on (0001), (1210), and (0112) sapphire substrates. The activation energies for the amorphous‐to‐γ‐phase and γ‐to‐…
2‘,6‘,3‘‘‘,5‘‘‘-Tetraphenyl- or tetra(4-biphenylyl)-4,4‘‘‘‘-diamino- p -quinquephenyls were synthesized from the corresponding pyrylium salts. Using them as starting materials, rigid-rod polyamides and polyimides containing phenyl or 4-biphenylyl side groups on the p -quinquephenyl segments of the backbone were prepar…
Preferential diffusion of deuterated solvents into the amorphous regions of a semicrystalline polymer enhances the contrast between the crystalline and amorphous regions measurable by small-angle neutron scattering. This scattering in nylons from the diffusion of D 2 O and deuterated ethylene glycol (d-EG) is analyzed…
The magnetic properties of the LaCo 13- x Al x and LaFe 13- x Al x compounds have been calculated, and the valence electronic structures of these compounds have been analyzed using empirical electron theory. In general, the calculated results agree with those of the experiments. Analysis of the electronic structures r…
The X-ray crystal structure refinements of two synthetic calcite single crystals containing 3.1 and 5.7 mol% magnesium were carried out. The structure of the second crystal was also refined at –80 °C. No significant structural difference from biogenic magnesium calcite was found. Magnesium within the crystals of calci…
The oxygen index (OI) of poly(butylene terephthalate) (PBT) tends to decrease when it is combined with milled-glass fibres either with or without the sizing treatment. This shows that the previously found apparent increase of flammability of PBT glass fibre composites (GFPBT) as compared to PBT is not due to the intro…
With the aim of increasing the number of structurally characterized dimetallic (CuII, LnIII) complexes, we have obtained a strictly dinuclear (CuII, GdIII) complex 1 in which, according to structural data, the two metal ions are triply bridged. Then, we have investigated the capability of Cusalen precursors for comple…