Materials Literature
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This paper presents analysis of leakage currents on high voltage insulators in frequency and time-frequency domains. Leakage currents were measured on five silicone rubber insulators under salt fog conditions and recorded over 1000 hours. Different types of leakage current patterns were identified and were grouped acc…
The physical properties of different varieties of cotton fibres of various origins have been studied after extraction using solvents and alkali scouring with reference to enzyme scouring process. Enzyme scoured samples show comparable results with that of solvent extracted and alkali scoured samples in terms of fibre…
Certain possibilities of scanning electron microscopy and cryoporometry based on nuclear magnetic resonance (NMR) have been evaluated to determine pore sizes in porous silicon. The results obtained by these methods have been compared. NMR cryoporometry has been shown to be promising in the investigation of porous mate…
A new thallium-rich variety of murunskite has been found in the Palitra peralkaline pegmatite at Mount Kedykverpakhk, the Lovozero alkaline pluton, Kola Peninsula, Russia. This mineral occurs as a flattened dark bronze segregation (0.3 × 0.8 × 0.8 mm) overgrowing ussingite in a cavity. The chemical composition is as f…
Abstract Vinyl ester resins are unsaturated polyesters, widely used as matrix for high performance composite materials. The paper presents the synthesis and characterization of some vinyl ester resin/hydroxyapatite bioactive compositions using an unsaturated copolyester based on turpentine oil as reactive diluent. The…
X-ray powder diffraction data collected in transmission and high-throughput geometries were used to analyze form I of atorvastatin. The X-ray wavelength of the synchrotron radiation used in this study was determined to be λ =1.3771 Å. Form I of atorvastatin was found to be triclinic with space group P 1 and unit cell…
Titanium is commonly used as an implant material because of its strength, durability, density, and ability to passivated. Two titanium surfaces were compared, one produced by passivation following the ASTM F87 standard and one produced by treating coupons with piranha. The XPS spectra of the two treated titanium surfa…
In this study, endothelial cell (EC)-seeded nanocomposite grafts were preconditioned with 1-2 dynes/cm(2) in vitro to establish whether low shear stress resulted in improved cell adherence prior to physiological shear stress (15 dynes/cm(2)). Alamar blue cell viability was assessed. Polymerase chain reaction was condu…
Abstract A new polymer poly{(lactic acid)- co -[(glycolic acid)- alt -(L-lysine)]} (poly[LA- co -(Glc- alt -Lys)]) was synthesized and modified with a cell adhesion peptide, Gly-Arg-Gly-Asp-Tyr (GRGDY, abbreviated as RGD). The process for preparing poly[LA- co -(Glc- alt -Lys)]/RGD involved four steps: Firstly, (3S)-3…
A constant-pressure ab initio technique is used to study the behavior of CdO at high pressures. A phase transformation from the NaCl-type structure to the CsCl-type structure via a rhombohedral intermediate state is successfully observed through the constant-pressure simulation. This phase change is also analyzed from…
Abstract The growth process of spherical substrate‐bound Au nanoparticles (AuNP) was investigated with in situ visible (VIS) spectroscopy, in situ Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). In the VIS spectra, the redshift and broadening of the AuNP's surface plasmon resona…
Article The Study of the Effects of Different Chemical Compounds applied on Luffa Cylindrica Fibres with the Help of Ultrasonic Energy was published on December 1, 2008 in the journal Journal of Polymer Engineering (volume 28, issue 8).
Abstract The term cast iron designates a group of materials that contain more than one constituent in their microstructure due to excess carbon that result in unique characteristics such as the fracture appearance and graphite morphology. This article discusses the classification of cast iron and the various metallurg…
Abstract A first step in investigating colour symmetries of periodic and nonperiodic patterns is determining the number of colours which allow perfect colourings of the pattern under consideration. A perfect colouring is one where each symmetry of the uncoloured pattern induces a global permutation of the colours. Two…
Abstract Three types of polystyrenes were prepared at different temperatures of 50, 150 and 250°C by bulk thermal polymerization of styrene below 20 percent of conversion. The assignment of all stereosequences at pentad level of quaternary aromatic carbon and hexad level of methylene carbon of the polystyrenes were do…
In this work, the contribution of the extrinsic effect to the macroscopic properties in soft and hard lead zirconate titanate ceramics is directly evaluated. Close to the room temperature, poled hard ceramics show an anomalous behavior, which is notably different from that of soft ceramics, not only in dielectric but…
Layered Cu(Cr x In 1 − x )P 2 S 6 mixed crystals have been studied by measuring the complex dielectric permittivity along polar axis in the frequency range 100 Hz – 16 MHz. It has been found that for 0.8 ≤ x ≤ 1.0 the line of the phase transitions into the antiferroelectric phase on the phase diagram occurs. On other…
Abstract Summary: In this paper, preparation of polyethylene/clay nanocomposites (PECNC) by in situ Ziegler‐Natta catalyst polymerization was investigated. A Ziegler‐Natta catalyst was first supported on montmorillonite (MMT) type clay and subsequently used for polymerizing ethylene. Clay and clay supported catalyst w…
Abstract Two salts of the biopolymer chitosan were prepared in aqueous medium by employing an excess of HCl or HNO3 in order to ensure neutralization of all NH 2 -chitosan groups. Chitosan salts were extensively dialyzed in dionised water and dried at 40 ºC until film formation. The films were characterized by thermog…
A high-temperature technique was developed for vapor pressure determination of solid and liquid γ-La2S3 (we called it the boiling point technique). Melting temperatures and total vapor pressures were measured for incongruently vaporizing γ-La2S3 at 1853–2210 K and 0.3–3.0 atm pressures. Having compared the slopes of t…