Materials Literature
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Yttrium calcium oxoborate (YCOB) and Nd:YCOB crystals of high optical quality and large dimension have been grown by the Czochralski method. Measurements of refractive indices have confirmed that these crystals were negative biaxial. The absorption spectra were determined and the various spectrum parameters were calcu…
Study of the Mössbauer effect over a range of both temperature and pressure on polycrystalline Fe-doped åkermanite, and X-ray measurements of spontaneous strain on single crystals of åkermanite under pressure, have been used to study the nature of the order parameters, and the characteristics for the transition of the…
We report a systematic study of the chemical properties of porous silicon as a moderate reducing agent and a nano-structure template for the reductive formation of nano-metal cluster aggregates. This study investigates the consequences of the interaction of silver ions in aqueous solution with porous silicon. The natu…
The dependence of the Photo-orientation process on the liquid crystallinity and the molecular aggregation is studied. In the case of ordered films the photo-orientation is restricted, but this restriction can be overcome by a photochemical pre-treatment using UV light or by higher power density of the incident Vis lig…
The reaction of phosphonium ylides with [PMo12O40]3− consists of successive single electron transfers leading to the formation of the 1e- and 2e-reduced polyoxomolybdates [PMo12O40]4− and [PMo12O40]5−. The ylide is converted into the corresponding phosphonium cation via a radical-cation intermediate. The reaction of p…
This paper reports on the construction of an integrated tool consisting of a neural network and subjoined local approximation technique for application to the sewing process, especially for selecting optimal interlinings for woolen fabrics. A single hidden layer neural network is constructed with five input nodes, ten…
We have applied Bader's topological analysis to the study of the $B1\ensuremath{-}B2$ phase transition in the alkali halides. Our results shed light upon the phase stability rules of the traditional ionic model: by using topological ionic radii, a connection between the topologies of the electron density and the energ…
Fluorine-doped In 2 O 3 films were deposited by rf magnetron sputtering using an In 2 O 3 target at substrate temperatures from RT to 300°C under Ar gas pressure of 1.0 Pa. The fluorine doping was carried out by the following two methods, (1) placing InF 3 pellets on the erosion area of the In 2 O 3 target, and (2) in…
We report the results of Monte Carlo simulations of the Lebwohl-Lasher model of nematic liquid crystals confined to cylindrical cavities with homeotropic anchoring. We show that the ratio of the bulk to surface couplings is not in general equal to the corresponding parameter K/W used in elastic theory (where K is the…
The forthcoming European legislation on cars and environment protection has an impact on the materials used for the production of cars. Weight reduction to limit the emission of green house effect gases is possible using new designs with recently developed high strength steels. Examples are described for the body in w…
The nucleation of grains by subgrain growth has been investigated using a two-dimensional vertex model. The initial geometry has an on average flat grain boundary, separating two populations of subgrains. The phenomenon has been studied using (i) a constant ratio between the subgrain and the grain boundary mobility or…
Six series of liquid crystal materials containing a 2,5-disubstituted thiophene unit were synthesized. The liquid crystal compounds obtained were characterized by NMR, differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction techniques. The properties of liquid crystalline phases were inv…
Abstract Morphology of natural rubber (NR) thin films crystallized under molecular orientation was examined by transmission electron microscopy (TEM). A thin film of NR (RSS#1) was made by casting its n -hexane (or benzene) solution onto the water surface, and prestretched up to a desired amount of strain (%). Each of…
A significant fraction of radionuclides released by nuclear events, for instance nuclear weapons tests, nuclear reactor accidents, and fires involving nuclear installations is associated with particles. Furthermore, effluents from nuclear reactors and reprocessing plants under normal operating conditions contain radio…
Michael-type additions of functionalized amines to CH2=CH−P=N−P=S linkages located at the core of phosphorus-containing dendrons allowed for the grafting of functions suitable to join these dendrons together or to various dendritic molecules. This reactivity led to original multidendritic systems incorporating differe…
Sol–gel‐derived LaCoO 3 thin films were deposited on yttria‐stabilized zirconia (YSZ) substrates from a lanthanum isopropoxide–cobalt acetate (with 2‐methoxyethanol) precursor solution. A chelating agent (2‐ethylacetoacetate) and polyethylene glycol (PEG) were used to modify the above‐mentioned precursor solution. The…
We present a general formulation based on the Jones-matrix theory for reciprocal nonabsorbing polarization devices, including polarization interference filters and liquid-crystal displays. The development of this formulation is based on general symmetry conditions that relate the Jones matrix when the device is illumi…
Impedance spectroscopy has been used to characterize Sr 0.97 Ti 1− x Fe x O 3−δ materials. This technique was suitable to evaluate the grain and grain‐boundary conductivities of samples with ≤5% iron. The role of grain boundaries was changed by sintering in different conditions, and this was interpreted by accounting…
Several 4-(oligodimethylsiloxyl)alkoxybenzoic acids and their hydrogen-bonded complexes with 4,4-dipyridyl or 1,2-bis(4-pyridyl)ethane were prepared and their phase behaviour studied by DSC and polarized optical microscopy. The neat acids showed no liquid crystalline phases. The 4,4-dipyridyl complex of 4-(n-heptameth…
It is well known that uncompensated in-plane switching (IPS) liquid crystal displays (LCDs) have much better viewing angle than conventional twisted-nematic (TN) LCDs. However, to achieve optimal viewing angle performance in these devices, they must be compensated by one or more films. In this paper, we will study the…