Materials Literature
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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…
We recently reported on a co-occurrence-based method for texture analysis. This paper uses this texture analysis method to examine the development of the texture during hydroentangling as a function process conditions. We report on the development of texture as a function of hydroentangling energy. Energy was varied b…
A new composite medium that possesses simultaneously negative permittivity and permeability in the microwave wavelength range is proposed. The medium is composed of evanescent waveguide structures responsible for the negative permittivity, with embedded cylindrical elements of a one-dimensional chiral medium accountin…
The reactions between Mn(Por)Cl and Bu(4)N(+)CN(-) have been examined in various solvents by UV-vis and (1)H NMR spectroscopy, where Por's are dianions of meso-tetraisopropylporphyrin (T(i)PrP), meso-tetraphenylporphyrin (TPP), meso-tetrakis(p-(trifluoromethyl)phenyl)porphyrin (p-CF(3)-TPP), meso-tetramesitylporphyrin…
Abstract The sorption and diffusion behavior of a series of aromatic solvents through blends of nitrile rubber (NBR) and epoxidized natural rubber (ENR) have been studied in the temperature range of 28–70°C. The effect of blend ratio, penetrant size and temperature on the transport properties was investigated. The rel…
Binuclear ZnPc complexes covalently bridged by catechol units have been synthesized and their absorption and photochemical properties examined. The complexes studied are 1,2-bis-2',9',16',23'-triphenoxyphthalocyaninatozinc benzene (6a), 1,2-bis-2'-9',16',23'-tri-4-carboxyphe-noxyphthalocyaninatozinc benzene (6b), 1,2-…
Conventional static and new dynamic drape coefficients of silk woven fabrics are examined precisely to distinguish those features of each classified fabric by its yarn structure using our regression equations. We find that Shantung has large values of static drape coefficient D, and small node number n, revolving drap…
Weight fractions of four dominant phases (C 3 S, C 2 S, C 4 AF and C 3 A) present in the NIST Reference Portland clinkers 8486, 8487 and 8488 were estimated by a series of Rietveld refinements. Calculated powder patterns were derived from the structural data for monoclinic C 3 S and C 2 S, orthorhombic C 4 AF and cubi…
Abstract Modules 〈P〉 and 〈S〉 which taken separetely constitute the structures of pyroxene and spinel respectively, may give rise, in combination, to a wide polysomatic system ranging between these two minerals as end members. The system is firstly discussed on the basis of complex layers 〈P m S n P m 〉, built up by so…
Abstract Ultra high molar mass polyethylene (UHPE) was melted at 160°C for various times or at various temperatures for 5 min and then the crystallization of the UHPE was carried out on cooling. It was found that the crystallization temperature decreased as the heating time or heating temperature increased. During the…
Groupe des solides divisés du MADIREL (Matériaux divisés, revêtements, électrocéramiques) Centre national de la recherche scientifique Université de Provence Bien des solides divisés (soit pulvérulents, soit poreux) qui se trouvent tels quels dans la nature, y ont un rôle important dans les équilibr
Introduction Electret Condenser Microphones (ECM) are used in almost every consumer and communication audio application. The total yearly volume of all ECM's is well over one billion units. Over the years, innovation in ECM's has concentrated mainly on lower cost production and smaller sizes. Other improvements of sen…
Hollow plastic parts can be made by a number of manufacturing methods, but only rotational moulding offers the ability to create one-piece, stress-free parts with attractive economics. However, the fundamental nature of rotational moulding is such that cycle times are long. Consequently, the plastic is subjected to re…
BACKGROUND: Bone graft substitutes are currently used individually or in various combinations in reconstructing bone defects. Nacre, marine mineralized structure, was recently proposed as a very biocompatible and osteoinductive material for use in periodontal and implant surgery. Our aim was to investigate the interac…