Materials Literature
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It is shown that thin layers of palladium coated magnesium lanthanide alloys reversibly go through an optical transition by variation of the hydrogen concentration, just as has recently been shown for pure lanthanides. With these layers optical switches can be constructed that exhibit three different optical states: a…
Polarizabilities of small ${\mathrm{Si}}_{n}$, ${\mathrm{Ge}}_{n}$ ( $n\ensuremath{\le}10$), and ${\mathrm{Ga}}_{n}{\mathrm{As}}_{m}$ ( $n+m\ensuremath{\le}8$) clusters are calculated using the higher-order finite-difference pseudopotential method in real space. We find the polarizabilities of the clusters considered…
Electro-optic modulation up to 113 GHz has been demonstrated using traveling wave polymer modulators. The modulation signal was directly detected at 1.3 μm using a laser heterodyne system with an external-cavity tunable semiconductor laser. The device optical response variation, as a function of frequency over the who…
The activation of p70s6k is accompanied by a complex series of phosphorylation events. In this review we propose a model of activation which divides p70s6k into four functional modules that cooperate in leading to full enzyme activity. In the light of the model, we suggest how candidate effectors of p70s6k activation…
The isotropic–nematic phase transition in a fluid of moderately long molecules interacting via a hard Gaussian overlap potential is studied using the decoupling approximation and computer simulation. Molecules of length-to-breadth ratios equal to 3 and 5, thought to set the relevant range of molecular elongations in r…
We demonstrate the possibility of using x-ray photoemission spectroscopy (XPS) to distinguish between the chemical properties of the neuron membrane and of the cytoplasm in brain cells. This was possible by analysing cells de-capped by using a newly developed technique. The XPS spectra clearly show chemical difference…
Cu - W multilayered films were properly designed according to an interfacial free-energy estimation such that an amorphous and three metastable crystalline FCC phases were formed by solid-state reaction in this immiscible system. To understand such alloying behaviour, a Gibbs free-energy diagram of the system was cons…
The secondary reaction of HCl with the growing metal oxide surface during atomic layer deposition from a metal chloride and water is investigated using model calculations. HCl released during chemisorption of a metal chloride occupies adsorption sites for the metal chloride which results in a decrease in the film thic…
Samples of the system (x = 0, 0.1,..., 0.7) were prepared by the usual ceramic technique. IR absorption spectra were used for analysing the compositions. The AC conductivity and dielectric properties (loss tangent tan , dielectric constant and dielectric loss ) have been measured at various frequencies and temperature…
Optical emission studies of molecules in plasma obtained by Nd:YAG laser ablation of graphite in a helium atmosphere are reported for irradiances in the range (1 - . The characteristics of the spectral emission intensity from the (Swan band) species have been investigated as functions of the distance from the target,…
Line widths and spin - spin relaxation times of P1 centres in synthetic Ib and natural Ia diamonds with concentrations of P1 and P2 centres covering the range 0.03 - 400 atomic parts per million have been measured. At concentrations higher than about ten atomic parts per million the line width is linearly dependent on…
Adhesional characteristics of an elastomeric liner composition toward a highly filled composite matrix and metal case were investigated. The system is composed of an excess isocyanate functionality in the elastomer compared to an excess hydroxyl functionality in the composite matrix. Both phases essentially contain th…
A disulfonyl chloride monomer having a pendent photoreactive diazoketone functional group has been synthesized in high overall yield (>90%). The synthesis involves a convenient two-step reaction sequence starting from commercially available 6-diazo-5-oxo-5,6-dihydro-1-naphthalenesulfonyl chloride, which was reacted wi…
Mimimizing a free-energy functional, we investigate the stability of ferroelectric fluid and various solid phases in the Stockmayer system. Our functional is based on the correlations of the isotropic fluid, calculated by integral equations. At the reduced dipole moment m * = 2.0 we found a ferroelectric fluid, but th…
A new method was proposed for the synthesis of nylon 6-potassium titanate composites with high strength and high modulus. Dispersion quality of potassium titanate whiskers in the polyamide matrix and the degree of interfacial adhesion between polyamide and whiskers are the key points with ϵ-caproamide and potassium ti…
The author's discovery of an unusual fiber element that is simply a variably spun birefringent fiber with a spin rate that varies from fast to zero or vice versa is revealed. The novel fiber element can be readily made by the existing fabrication technique, with fairly loose tolerances of the structural parameters. An…
The rotational dynamics of nearly spherical and cylindrical tracers dissolved in supercooled o-terphenyl is studied via the Electron Spin Resonance spectroscopy. On decreasing the temperature, a sharp crossover is observed from the regime where the Debye-Stokes-Einstein law (DSE) holds to a new one which is accounted…
A series of ethylene oxide—ethylene terephthalate segmented copolymers (EOET) with different long soft segments and different hard-segment contents were synthesized. The thermally stimulated shape-memory behavior of EOET segmented copolymer is characterized by the maximum recovery (Rf), the recovery temperature (Tr),…
The effect of vibromilling or jet milling on gelation and mechanical properties of poly(vinyl chloride) (PVC) was studied through SEM, FTIR, DSC, and mechanical properties tests. The experimental results show that the size of the grain and apparent density of PVC are decreased. The grains become much more loosely aggr…
Highly emissive (with an external quantum yield exceeding 35 percent at a 365-nanometer excitation wavelength) broadband phosphors can be synthesized from a tetraalkoxysilane sol-gel precursor and a variety of organic carboxylic acids. The air-stable phosphors were synthesized at low temperatures (less than 300°C) and…