Materials Literature
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A combined experimental and numerical study of the horizontal Bridgman growth of pure succinonitrile (SCN) has been performed. The effect of convection on interface propagation and shape is quantified and discussed. Measurements were obtained both under conditions of nogrowth and for a 40 µm/s growth rate. The quantit…
The apparent viscosity of alginate impression paste prepared by three mixing methods (hand-mixing technique (HM), semiautomatic instrument (SM) and automatic mixing instrument (AM)), and the gel strength and surface depression of the respective set materials were measured. The materials used were eight commercially av…
In order to obtain comb-like poly-L-lysines bearing a biphenyl mesogen at the end of every repeating unit we have synthesised Nε-4-phenylbenzamido-L-lysine (Kφφ) and the corresponding N-carboxy anydride (Kφφ-NCA). We have homopolymerised the Kφφ-NCA and block-copolymerised it with the NCA of Nε-trifluoroacetyl-L-lysin…
We investigate the geometry and electronic structure of an interstitial H atom in the BaTiO3 crystal considering both cubic and tetragonal crystallographic lattices. A quantum-chemical method based on the Hartree-Fock formalism is used throughout the study. Interstitial H is found to bind to one of the O atoms, formin…
The synthesis and mesomorphic properties of a variety of novel hexasubstituted triphenylene derivatives having three different types of peripheral substitutions are described. Monobromination of 2,3,6,7-tetrakis(pentyloxy)triphenylene 4, prepared by Suzuki coupling of 2-iodo-3′,4,4′,5-tetrakis(pentyloxy)biphenyl 2 and…
ABSTRACT Short fatigue crack nuclei in austempered ductile cast iron have been studied using optical microscopy, scanning electron microscopy, atomic force microscopy and X‐ray microtomography and by electron backscatter diffraction analysis. Fatigue cracks nucleate at graphite nodules and shrinkage microporosity. The…
Alternation of the melting temperature of irradiated mixed oxide (MOX) fuel in fast reactors with progress of burnup was determined in relation to the actinide fractions contained and of the oxygen-to-metal (O/M) ratio. Based on ideal solution models of UO2-PuO2 and UO2-PuO2-Am2O3 systems and on correlations obtained…
The elastic matching of phases in the vicinity of the morphotropic phase boundary in x PbTiO 3 -(1− x )Pb(Zn 1/3 Nb 2/3 )O 3 crystals is investigated in an external electric field with strength E ‖ [001]. The field dependences of the unit cell parameters of the monoclinic phase are determined experimentally in the ran…
Crystals of potassium alum, pure and slightly doped with Cr3+, were grown from aqueous solution by slow temperature lowering. In addition, short re-dissolution periods were introduced in order to provoke growth defects and changes of growth rates. Crystal slices of about 1 mm thickness were studied by conventional LAN…
Asp residues are significantly under represented in beta-sheet regions of proteins, especially in the middle of beta-strands, as found by a number of studies using statistical, modeling, or experimental methods. To further understand the reasons for this under representation of Asp, we prepared and analyzed mutants of…
Block copolymers have a potential utility as drug carriers. In order to study their in vivo fate, the biodegradable block copolymer poly(D,L- lactide ethylene oxide) (PLA/PEO) (Mw 5000/5000) with a p-methoxyphenyl moiety was radio labeled with 125 I. The copolymer was [ 125 I] iodinated in the organic medium by a chlo…
Fifty three products, mostly carboxylate salts of amines, were evaluated as vapour phase corrosion inhibitors for mild steel. Fifteen compounds showed effectiveness in excess of 90%. Morpholine was the most effective amine and caprylic acid the most effective acid constituent. The effectiveness of ammonium monocarboxy…
Ta and Ta–N films sputtered with pure Ar, 10%, 20%, 30%, 40%, 50%, and 60% N2/Ar gas ratios were found to be a mixture of β-Ta and bcc-Ta, bcc-Ta, bcc-TaNx, expanded bcc-TaNx, hcp-Ta2N, fcc-TaN, and fcc-TaN (nearly amorphous) phases, respectively. The resistivity was found to be lowest in samples sputtered with 10% N2…
This paper presents X ray excited TL spectra of magnesium borate doped with either single rare earth ions Dy or Tm, or co-doped with Dy/Tm, Tm/Mn or Dy/Tb. Intrinsic emission from the host material is in the UV/blue region at approximately 375 nm, with a tail extending to 200 nm. The main dosimetric peak is detected a…
Abstract A systematic study of the influence of the drawing temperature and rate on the ultradrawing properties of film samples prepared from gel solutions of ultrahigh molecular weight polyethylene and low molecular weight polyethylene blends is reported. At a fixed drawing rate, the achievable draw ratios reached a…
Abstract Treatment of a mixed-valence Mn6 cluster, [Mn6O2(t-BuCO2)10(t-BuCO2H)4] (1), with 4,4′-bipyridine (bpy) in dichloromethane/1,2-dichloroethane solution gave a one-dimensional polymeric chain compound, [Mn6O2(t-BuCO2)10(t-BuCO2H)2(bpy)] (2), in which the parent cluster core was maintained as a building block.
The traditional approach for the prediction of noise radiated from induction motors is usually based on a deterministic approach in which the motor is modeled using finite-element and/or boundary-element methods (FEM/BEM). A great deal of structural details has to be modeled using the deterministic approach. While the…
We introduce the idea of an “equi-g(r) sequence.” This consists of a series of equilibrium many-body systems which have different number densities ρ but share, at a given temperature, the same form of pair correlation function, termed “target g(r).” Each system is defined by a pair potential indexed by ρ as in uρ(r).…
Two subfamilies of UDP-GlcNAc C6 dehydratases were recently identified. FlaA1, a short soluble protein that exhibits a typical SYK catalytic triad, characterizes one of these subfamilies, and WbpM, a large membrane protein that harbors an altered SMK triad that was not predicted to sustain activity, represents the oth…
Comparative mechanical tests of an Al-Cu-Fe quasicrystal and a tungsten (001) single crystal have been carried out using cyclic nanoindentation by a Berkovich indenter. The first loading-unloading cycle up to 30 mN formed the initial indent. On reloading of the indenter up to 50 mN, a transition from elastic to plasti…