Materials Literature
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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…
Polyhydroxyalkanoates (PHA) and poly-beta-hydroxybutyrate (PHB) in particular have become compounds which is routinely investigated in wastewater research. The PHB analysis method has only recently been applied to activated sludge samples where PHA contents might be relatively low. This urges the need to investigate t…
The fast-activated anionic polymerization of ε-caprolactam has been performed in suspension in order not only to efficiently dissipate the heat of polymerization, but also to directly synthesize powdered polyamide 6. The continuous phase of the system is composed of polyisobutene oils: five fractions, different in the…
The syntheses of two AB 2 monomers, aminodicarboxylic acid ( 1 ) and aminodicarbonyl azide ( 2 ), and their model reactions for the one-pot synthesis of dendritic aromatic poly(urea-amide)s using the two AB 2 monomers were carried out. The model reaction of 2 and p -tolyl isocyanate produced the target urea with two a…
A solid‐state route to synthesize bismuth germanate (Bi 4 Ge 3 O 12 , or BGO) ceramics, and the optimum conditions for the laser sintering of these ceramics, were investigated. Special emphasis was placed on the influence of laser power and irradiation time on densification and microstructure evolution. The procedure…
A model for the interface between a concentrated and a very dilute polymer solution is studied by Monte Carlo simulations at temperatures below the Theta temperature (in bad solvent conditions). The wave-number–dependent interfacial tension γ( q ) is extracted from an analysis of the capillary wave amplitudes. It is s…
Abstract The present work represents an exploratory study of creep in a Ni-rich NiTi shape memory alloy (50.7 at.% Ni) in the temperature range 470–530°C at stresses betweef 90 and 150 MPa. Creep o...
The dose response of the 375 degrees C. 470 nm TL peak in fired quartz is studied by using thermoluminescence emission spectra and monochromatic glow curves. The blue emission displays a significant sensitivity increase for doses in excess of 1000 Gy, subsequent saturation at 16 kGy and a pre-dose effect over the enti…