Materials Literature
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Nano Si/C/N powders with different configurations were prepared by Chemical Vapor Deposition (CVD). The crystallinity of the products increased with increasing reaction temperature. The powder prepared at 1200 °C consisted of amorphous spherical particles with a particle size of 20 to 50 nm. The nanocrystalline partic…
The thermoluminescence (TL) glow curves of irradiated annealed and non-annealed synthetic beta-quartz (Li0.73Al0.73Si1.27O4) synthesised using the ceramic method have been studied. Annealed samples (1200 degrees C for 12 h) exhibit some changes of shape and intensity in the TL glow curves when compared to non-annealed…
The dielectric spectrum of an antiferroelectric liquid crystal is predicted by finding approximate analytic solutions to the Landau–Ginzburg equation describing its time dependent behavior. Two collective modes are predicted: (i) a low frequency mode that is caused by an in-phase rotation of the directors in adjacent…
The effects of different types of fibers on the physical and mechanical behavior of isotactic polypropylene (iPP) are reported. In particular, the flow behavior, mechanical properties (tensile, flexural and impact resistance) and morphology are examined. It has been found that all the fibers studied behave as effectiv…
Shape memory alloys (SMAs) have demonstrated the potential for various smart structure applications. SMAs undergo a reversible phase transformation from martensite to austenite as temperature increases. This transformation leads to shape recovery and associated recovery strains. If SMA actuators are embedded off the n…
Abstract Selected phosphorus/halogen flame retardant synergisms on cotton fabric substrates have been modelled using simple salt mixtures (sodium bromide and diammonium phosphate) and backcoating formulations based on combinations of ammonium polyphosphate, melamine phosphate and cyclic phosphonate with decabromodiphe…
Various kinds of magneto-optical properties are investigated in rare earth orthochromites. From an analysis of Cr3+ exciton absorption in RCrO3 (R=Tb, Dy, and Ho), it is unferred that these compounds exhibit an anomalous spin-reorientation in a magnetic field along the b axis, where the weak ferromagnetic moment of th…
Particulate fillers (carbon black and silica) and short fibre (aromatic polyamide, ~evlar@) have been utilised to produce rubber composites based on acrylonitrile-co-butadiene rubber (NBR). Mechanical properties of these composites have been determined and compared with unfilled rubber vulcanisate. The effect of surfa…
A homologous series of novel two-ring alkoxythiophene-containing liquid crystals has been synthesized using a recently developed cyclization methodology to construct the heterocyclic core. The new heterocyclic unit is expected to confer high negative dielectric anisotropy and high dielectric biaxiality when incorporat…
The theoretical permeability of multilayered nonwoven fabrics was studied using a modified Kozeny equation. The Kozeny equation is based on the concept of a hydraulic radius, i.e., a characteristic length parameter. It is limited to structures with porosities less than 0.94. The structures used in this research are in…
We examined the effects of ruscogenin glycoside (Lm-3), isolated from Liriope muscari, on lymphocyte adhesion to extracellular matrix. Adhesion of Jurkat cells activated by anti-CD3 to type I collagen was inhibited by Lm-3 in a concentration- and time-dependent manner. Lm-3 also inhibited the cell attachment to fibron…
A method of synthesis leading to poly(3-alkylthiophene)s with two different functional groups in the side chain, one of which is an NLO-active chromophore, has been developed. This method, based on the post-functionalization of a reactive homopolymeric precursor, permits to prepare different polyfunctional polymers th…
We consider the inverse Landau-Zener problem which consists in finding the energy sweep functions W ( t ) ≡ ε 1 ( t ) − ε 2 ( t ) resulting in the required time dependences of the level populations for a two-level system crossing the resonance one or more times during the sweep. We find sweep functions of particular f…
Over the last few years a great improvement in the efficiency of porous silicon-based solar cells has been achieved. A very important advantage of using porous silicon in photodiodes and solar cells is that the surface roughness of this material can be used to reduce the surface reflectance to very low values (antiref…
Collagen has been investigated as a potential natural biomaterial, because of its occurrence in the extracellular matrix. Collagen requires crosslinking in this context, by reagents that are often cytotoxic. Glutaraldehyde is one such agent that is potentially cytotoxic. The aim of this study was to determine the caus…
Transmission electron micrographs of different biological material, cryofixed, freeze-dried and embedded in Spurr's resin, in Epon, or in Lowicryl, are presented. The structure preservation obtained either without or with application of chemical fixatives after drying showed that freeze-dried embedded specimens are pa…
Dielectric Ba0.6Sr0.4TiO3 films doped with different weight percentages of TiO2 were deposited by pulsed-laser deposition. The dielectric constant, dielectric loss, and the dielectric tunability of the films were found to be a strong function of the weight ratio of TiO2/Ba0.6Sr0.4TiO3. Compared to the pure Ba0.6Sr0.4T…
An emerging topic in plant biology is whether plant cells display similar elements of programmed cell death (PCD) as animal cells do. We have studied cell death in maize roots exposed to cold stress by using fluorescence microscopy, terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL), D…
An analysis of the linear modulation-OSL (LM-OSL) peak and the main TL peak from irradiated Al2O3:C is presented. Data are presented indicating that the LM-OSL peak is composed of three overlapping components originating from populated traps with optical cross sections of 10(-18) - 10(-20) cm2. Studies of the main TL…
In this paper the problem of shape stability is considered, for a bubble with time-dependent radius, translating unsteadily in a flow. This situation can be brought about, for example, by forcing with an acoustic traveling wave. The equation governing translation was derived in a previous work [Reddy and Szeri (unpubl…