Materials Literature
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Abstract In the second part of this study, the performance of phenol/phosphite/zinc stearate packages and the contribution of each additive to the long‐term thermal stabilization and photostabilization were evaluated in high‐density polyethylene produced by using Phillips catalyst technology. Infrared spectroscopy, ul…
Single phase α-Eu2GeS4 was prepared by oxidation of Eu2Ge with sulfur. Magnetic susceptibility measurements reveal Curie behavior with an experimental magnetic moment of 7.85(5) μB/Eu, compatible with divalent europium. Eu2GeS4 orders antiferromagnetically at TN = 5.0(5) K and undergoes a metamagnetic transition at a…
Anomalous dielectric relaxation behaviour is observed in the ferroelectric liquid crystalline polymer (viz. ferroelectric copolysiloxane (R)-COPS 11-10) around the ferroelectric SmC* to paraelectric SmA phase transition. Measurements have been performed on sample of thickness ∼10 μm in indium-tin-oxide coated cell in…
Various low molecular weight chitosans were prepared by oxidative degradation with H2O2, and characterized by IR,13C-NMR and gel permeation chromatography. Their carboxylic contents increased with decrease in molecular weight (M w ). The antitumor test of the samples against sarcoma 180 tumors suggested that the water…
Abstract An important aspect of the fibre-to-yarn production process is the quality and price of the resulting yarn. The yarn should have optimal product characteristics, while maintaining as low a price as possible. Early optimisation models of the fibre-to-yarn process, based on neural networks and genetic algorithm…
BACKGROUND Recently, UV-Vis reflectance spectroscopy was used to help distinguish natural-color “golden” cultured pearls from those reportedly treated using heat (Elen, 2001). The application of this “heat” treatment method to undrilled pearls was unlike the more common dyeing method encountered by gemologists, which…
This work umed to the Identlficatlon of the prmc~pal gaseous spcctcq mvolvcd III muxo~a~c plasmoawstcd chemical vapor depoutlon of dlanlond from COI-CH4 m~xturcs The nature and conccntratlon of the unportnnt prccur~rs dnd etching spcc~c~ depend on the external controlled
We report the development and characterization of high quality polyaniline-silicon heterojunction diodes appropriated for use as gas and/or ionizing radiation sensors. Polyaniline thin films 40 nm thick are an active part of the junction structure, that presents excellent electrical characteristics, with rectifying ra…
La solubilité et les phases en équilibre dans le système quaternaire Na + ,Mn 2+ /Cl – ,(H 2 PO 2 ) – //H 2 O sont étudiées par la méthode isothermique à 25 °C, dans le but d’élaborer une méthode pratique de préparation de l’hypophosphite de manganèse par réaction d’échange. Un point invariant quaternaire est détermin…
An attempt is made to reconcile observations and theories of cross-slip with recent models of cyclic plasticity and the fatigue endurance limit of crystals. According to this view, the stress required to separate two screw dislocations of opposite signs, which are just on the point of mutual annihilation by cross-slip…
Abstract This paper describes the effects of composition and processing conditions on the efficiency of the compatibilizer prepared from a thermotropic liquid crystalline polymer (TLCP) and the sodium salt of a poly(ethylene‐ co ‐ r ‐acrylic acid) ionomer (EAA‐Na) in TLCP/low‐density polyethylene (LDPE) blends and TLC…
Most electrolytic zinc plants have to deal with dissolved magnesium in their process liquors, as zinc sulphide concentrates contain small amounts of magnesium. Applied magnesium bleed methods are generally expensive and environmentally unfriendly. Recently, a new approach was suggested and discussed, which involves se…
Powder X-ray diffraction (XRD) data were collected for La 0.65 Sr 0.35 MnO 3 prepared through an alternative method from a stoichiometric mixture of Mn 2 O 3 , La 2 O 3 , and SrO 2 , fired at 1300 °C for 16 h. XRD analysis using the Rietveld method was carried out and it was found that manganite has rhombohedral symme…
Abstract Waste kaolinite from a fertilizer industry was intercalated with n -methylformamide (NMF) under ambient conditions. The complex was washed, characterized and then reacted with benzamide (dissolved in ethanol) under similar conditions. Using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTI…
The electronic properties of H impurity in an Fe Σ = 5, 53.1° [100] (012) symmetrical tilt grain boundary (GB) were studied using qualitative electronic structure calculations in the framework of the atom superposition and electron delocalization molecular orbital (ASED-MO) theory. A large cluster containing 197 Fe at…
Abstract The title compounds have been synthesized via oxidation of the elemental pnicogenes (M = As, Bi) with the hyperoxides AO 2 (A = K, Rb, Cs) and their crystal structures were determined on the basis of single crystal X-ray data. In K 3 AsO 4 (orthorhombic, Cccm, a = 1060:1(1), b = 1135:2(1), c = 1694:0(2) pm, Z…
Abstract The crystal structures of the four synthetic double salt compounds K 2 Mn(SO 4 ) 2 ·2H 2 O (space group P 1̅, no. 2, Z = 2, a = 6.574(1), b = 7.332(1), c = 10.700(1) Å, α = 72.89(1), β = 73.91(1), γ = 69.77(1)°, V = 453.6(1) Å 3 ) and K 2 Cd(SeO 4 ) 2 ·2H 2 O(space group P 1̅, no. 2, Z = 2, a = 6.625(1), b =…
RATIONALE AND OBJECTIVES: To evaluate endothelial cell (EC) attachment on different stents and stent-grafts combined with different coating materials. MATERIALS AND METHODS: Three segments (approximately 1cm(2) each) of Cragg-, Memotherm-, Palmaz-, Strecker-, and Wall-stents, uncovered or covered with polytetrafluoroe…
Abstract In recent years, experimental techniques based on microdielectrometry have attracted increasing interest for continuous monitoring, in a nondestructive way, of the advancement of the reaction of thermoset resins under cure. The extension of this technique for “ in ‐ situ ” monitoring of the crystallization of…
The effect of NaOH mercerization on the crosslinking properties of 1,2,3,4-butanetet racarboxylic acid (BTCA) on ramie yarn is studied, with emphasis on mercerization tension. NaOH at mercerization strength decrystallizes the ramie fibers, resulting in a higher accessibility to BTCA. Due to the change in fiber orienta…