Materials Literature
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The paper deals with phenomenological treatment of Lead Zinc Niobate—Lead Titanate (PZN:PT) crystals. Polarization and weak field permittivity as functions of temperature and bias electric field throughout the whole phase transitions range are of particular importance for the PZN-PT composition's behaviour close to th…
A origem da transformação de fase da alumina tem sido alvo de intensos estudos devido a interesses tecnológicos associados às fases cristalinas envolvidas. Entretanto, há dúvidas quanto sua origem, principalmente quando se trata da influência de aditivos na temperatura da transição. Este trabalho tem como objetivo um…
First, the efficiency of a mixture PU/APP as fire retardant in an ethylene-vinyl acetate matrix is investigated. It is shown that the fire performance is sharply improved. Second, the mechanism of fire retardancy of PU/APP is discussed considering the protective surface material, investigated by X-ray photoelectron sp…
Abstract Six formulations of polypropylene (PP) containing combinations of calcium carbonate (CaCO 3 ), stearic acid, and a light stabilizer were prepared and placed in the environment for their degradation. Samples were taken at proper time intervals for following the consequences of the outdoor conditions. Impact re…
In this Note, we prove that the identity matrix is an inner point of the quasiconvex hull K qc of a compact set <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi mathvariant="normal">K</mml:mi> <mml:mo>⊂</mml:mo> <mml:mo>{</mml:mo> <mml:mi mathvariant="normal">X</mml:mi> <mml:mo>∈</mml:mo> <…
A triple-stack multiple-disk spindle unit is used widely in actual draw texturing processes. In this kind of friction false twisting process, the angle of inclination (angle between yarn path and disk axis) is an important factor that determines yarn tension and twisting torque over the disk surface. This paper propos…
Published March 2003. A more recent revision exists. Facts and recommendations in this publication may no longer be valid. Please look for up to date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Mixtures of blowing agents are becoming widely used in the industry either for economical reasons or for achieving better control of processing conditions. Despite the fact that they are commonly used for foaming, the literature is fairly scarce on that particular subject and the fundamentals are not very well underst…
The time-resolved photoluminescence from a phosphate-glass photoluminescence dosimeter (GD-300) was compared for different quality radiations: relativistic heavy ions (12C and 40Ar) and 60Co gamma rays. The intensities of photoluminescence afterglow at 2-7 micro(s) after pulsed UV excitation, i.e., in the time range u…
Abstract We present a qualitative argument suggesting that a statistical (AB) copolymer should display a certain form of weak segregation, with A rich and B rich regions of size comparable to the coil radius. This should occur if the Flory parameter χ is larger than unity (much larger than for the phase separation of…
The synthesis of 1,4-bis(2-naphthyl)-1,3-butadiynes, containing terminal alkoxy chains, is reported. The mesomorphism of these compounds has been characterized by differential scanning calorimetry and polarizing optical microscopy. The introduction of terminal alkoxy chains, significantly lowers the melting temperatur…
An analysis was made of the magnetic susceptibility, electrical resistivity, and magnetoresistance of (La 1− y Pr y ) 0.7 Ca 0.3 MnO 3 samples differing in Pr content and enriched in the oxygen isotope 18 O. At high temperatures, all samples were paramagnetic insulators, while below 60 K, part of them transferred to a…
c = 20.772(6) , V = 296.1 3 , Z = 3, R gt (F) = 0.051, wR ref(F 2 ) = 0.110, T = 298 K.
Hemidesmus indicus var. indicus belonging to the family Asclepiadaceae was screened for its activity against Helicobacter pylori(Hp) human isolates. Flowering and vegetative period samples were analysed. Aqueous (hot and cold) and solvent extracts (acetone, chloroform and methanol) were screened. Among them chloroform…
Abstract An analysis of models (presented in available world literature) for the twist of multi-folded threads consisting of two component fibre streams (doubled thread, doubled yarn) is discussed. The possibility of forecasting the twist value of the component streams for an accepted twist value of the multi-folded t…
Several investigations have examined magnesia-based investments for pure titanium casting. However, the thermal expansion value was insufficient at low casting temperatures and high interfacial reactivity occurred at high casting temperatures. The purpose of this investigation was to modify a magnesia-based investment…
OBJECTIVE: To describe the methods which were used to develop collagen-based materials for wound dressing. METHODS: Fresh frozen bovine tendon was treated with 0.05 mol/L acetic acid at pH 3.2 for 48-72 hours, homogenized, filtered, mixed with 8% chondroitin sulphate, for creating a deaerated 1.5%-2.5% collagen soluti…
Abstract This study demonstrates and discusses ternary miscibility in a three‐polymer blend system based on balanced binary interactions. A truly miscible ternary blend comprising poly(ε‐caprolactone) (PCL), poly(benzyl methacrylate) (PBzMA), and poly(vinyl methyl ether) (PVME), was discovered and reported. Miscibilit…
The nonlinear dielectric properties of a ferroelectric material were studied based on the concepts of the Preisach model. In this work, the ferroelectric polymer polyvinylidene fluoride was chosen as an example. The electric displacement D in the material when subjected to a sinusoidal electric field of a given freque…
Calcium hydrogen phosphate dihydrate (CHPD) crystal is a well-known urinary crystal. Calcium phosphate is present in urinary calculi (stones) as either apatite or brushite. Crystals of calcium hydrogen phosphate dihydratewere grown by single diffusion gel growth technique in silica gels. The supernatant solution conta…