Materials Literature
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Three antimony-containing polymers (P1, P2, P3) were synthesized by reacting triphenyl antimony dinitrate with bisphenol A (P1), with tetrabromobisphenol A (P2) and with N,N′-bis(4-hydroxybenzylidene)-oxydianiline (P3). Solubility, density, chemical and thermal stability of these antimony polymers have been evaluated.…
Two homeotypical phases occur at the mole fraction x Al ≈0.75 in the ternary system Co-Ni-Al: the pseudoternary intermetallic compound ( Co , Ni ) 4 Al 13 ( h ) (space group C 2/ m , Pearson code mC (34-1.8)) [Notation, according to Parthé et al. ( 1993 ). TYPIX, Standardized Data and Crystal Chemical Characterization…
This paper discusses the process by which a thermodynamically unstable impurity atmosphere consisting of hydrogen atoms displaces an edge dislocation. Relationships are obtained for the displacement force in the approximation of dilute solid solutions. The results of theoretical analysis are used to explain the hydrog…
Pressure dependence of the hydrostatic piezoelectric coefficient dh was measured for PVDF and P(VDF-TrFE) polymer foils in the range up to 60MPa. The hydrostatic strain coefficient dh, the hydrostatic voltage coefficient gh and figure of merit dh·gh were determined using the static method. Electric charge induced acro…
Sm3Cl[SiO4]2: A Chlorine-poor Chloride Orthosilicate of Samarium Pale yellow, plate-like single crystals of Sm3Cl[SiO4]2 (orthorhombic, Pnma; a = 701.74(8), b = 1800.8(2), c = 626.63(7) pm; Z = 4) are obtained upon the reaction of SmCl3, Sm2O3 and SiO2 (”︁Kieselgel”︁”︁) in 1 : 4 : 6 molar ratios, most advantageously i…
Mosaic spread values for crystals grown in microgravity were measured using synchrotron radiation. Full width at half maximum (FWHM) values for diffraction line profiles in the range 10-20" (arc seconds, 1" = 1 degrees /3600) were observed. These values are similar to those measured for crystals grown on earth using t…
Alkaline earth benzoates were synthesized using hydrothermal reaction. The complexes were characterized by elemental analysis, IR, X-ray powder diffraction. All of them are monoclinic and have layered structure. The mechanism of thermal decomposition of alkaline earth benzoates was studied by using TG, DTA, IR and gas…
<div class="htmlview paragraph">Fleet tests conducted on electrical vehicles around the world have very clearly shown that battery-powered cars may be regarded as zero-emission vehicles with respect to their local environments only. Emission measurements on vehicles powered by internal-combustion engines equippe…
<div class="htmlview paragraph">Conventional powder metal (PM), at typical press and sinter densities of around 7.0 g/cm<sup>3</sup>, cannot be considered as a viable manufacturing technology for automotive transmission gears because of deficits in mechanical durability. The durability limitations ar…
Abstract SERS technique wae used to study the chemiesorption kinetics of Methylene Blue (MB) on the HNO 3 ‐etched silver surface. The adsorption kinetic parameters were deduced from different vibrational modes at a low concentration of 3.5 × 10 −6 mol/L, and it showed that MB adsorbed uniformly (monolayerly) on silver…
A new method for the numerical generation of nanotube caps based on unfolding of caps onto honeycomb lattice is developed. Expressions connecting the components of the tubular vector and coordinates of pentagonal defects on the honeycomb lattice are derived. Numerical solutions of the Diophantine equations give a full…
Dynamics in solution and photochromic properties of radical copolymers of 4-(4-oxy-4′-cyanoazobenzene)but-1-yl methacrylate, 6-(4-oxy-4′-cyanoazobenzene)hex-1-yl methacrylate, and 8-(4-oxy-4′-cyanoazobenzene)oct-1-yl methacrylate with (–)-menthyl methacrylate were investigated. 13C NMR and 2D HETCOR spectroscopy allow…
It is well known that, due to the absence of an intrinsic length scale, conventional rate-independent plasticity theories fail to explain the size effects observed in problems such as shear-flow localization, nanoindentation tests and precipitate hardening. Consequently, several new nonlocal/gradient constitutive theo…
Abstract The structural and thermal properties of polyhydroxybutyrate (PHB) gels in dimethylformamide (DMF) are presented and discussed. The dilute and semi‐dilute mixed PHB/DMF system undergoes a phase separation on cooling at a temperature T gel, producing a gel in which the crystalline fraction is of the order of 5…
A quantum mechanical technique based on the local density approximation has been used to predict the geometries, energetics and electronic structures of small clusters consisting of one to four pairs of atoms, (MX) n , n = 1-4. The materials modelled were NaF, NaCl, NaBr, MgO, AlN and Sic. Convergence, as a function o…
Hydrotalcites were prepared with various Mg/Al ratios. The influence of pH and alkaline solution of the precipitation were examined. The compounds are well cristallized when the precipitation is done with NaOH + Na2CO3 alkaline solutions at pH near 10. These samples contain Cl- and (CO3)2- compensating anions in the i…
David A. Siqueiros Beltrones, Edna Sanchez Castrejon, Structure of Benthic Diatom Assemblages from a Mangrove Environment in a Mexican Subtropical Lagoon, Biotropica, Vol. 31, No. 1 (Mar., 1999), pp. 48-70
Reactions of 2,2′-dipyridylamine (dpyam) with cadmium halides yield crystals of [Cd(dpyam)(H 2 O )Cl 2 ] (1), [Cd(dpyam)Br 2 ] (2), and [Cd(dpyam)I 2 ] (3). With CuCl 2 and KCN a complex [Cu(dpyam )CN] · H 2 O (4) is obtained. Depending on the size of the halide ions the coordination changes from octahedral in 1 to tr…
The rate at which a drug enters the bloodstream is an important characteristic of any drug product because it may have a marked influence on the biological response elicited by the drug. Before entering the bloodstream a solid dosage form (tablet or capsule) must first dissolve and then the drug in solution is absorbe…
Electron energy-loss spectra of (V 1- x Cr x ) 2 O 3 ( x =0.012) at the antiferromagnetic insulating (AFI), paramagnetic metallic (PM) and paramagnetic insulating (PI) phases have been measured using a high-resolution transmission electron energy-loss spectroscopy (EELS) microscope. The changes in the EELS spectra at…