Materials Literature
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The RNA-dependent RNA polymerase (P2) from bacteriophage Phi6 has been cloned and the protein overexpressed in Escherichia coli to produce an active enzyme. A fully substituted selenomethionyl version of the protein has also been produced. Crystals of both proteins have been grown; most belong to the monoclinic space…
Titanium oxide films with a thickness of a 400 nm were deposited on p-type Si(100) at room temperature by e-beam evaporation, and titanium dioxide was evaporated in oxygen environment at a pressure of 2×10−6–4×10−5 Torr. Effects of oxygen flow rate (FO2) on the properties of the films, such as surface roughness, compo…
We measure the azimuthal anchoring strength and easy axis gliding of the nematic 5CB on weakly anisotropic substrate. We study the anchoring evolution at a time scale ranging from a few minutes up to a few months. We separate approximately the elastic and the viscous response and we obtain the gliding velocity as a fu…
A new approach to the assembly and photochemical disassembly of molecular hosts is developed. It is based on photoinduced fragmentation in hydroxyalkyl dithianes and utilizes a novel spiro-bis-dithiane as a photolabile molecular tether to link two formylated macromolecular blocks, e.g., formyl calixarenes or formyl di…
The effect of aspartic acid, glutamic acid, hexaammonium tetrapolyphosphate, calcium phytate, and polyaspartic acid on calcium hydrogenphosphate dihydrate (CaHPO 4 ·2H 2 O, DCPD) crystal growth morphology was studied. The mechanism of additive−DCPD crystal interaction depends on the size and structure of the additive…
Abstract Surface treatments using glow discharge plasmas from O 2 and Ar were applied to blend sheets of poly(ϵ‐caprolactone)‐polycarbonate (PCL/PC), which had been produced by extrusion from melts of the mixture at various blend ratios. As to the reactivity of these two plasmas, O 2 ‐plasma forms the oxidative specie…
The chain dimensions 〈R2〉 of nondilute polymer solutions confined to a slit of the width D were studied using lattice simulations. It was found that the chain compression induced in good solvents by the concentration ϕ is enhanced in a slit relative to the bulk. The global dimensions of chains also change with ϕ in co…
The design of an optical element profile with specified transmission function for a given incident wave is of fundamental concern in optical design. A well-known example is the design of an aspherical surface in order to realize a spherical phase-only transmission. Various wave-optical system design methods lead to tr…
Syndiospecific silyloxy-functionalized polystyrene with high molecular weight was prepared using a (pentamethylcyclopentadienyl)titanatrane/MMAO catalyst system. The resulting polymer is soluble in polar organic solvents such as THF and shows good thermal stability. In addition, the compound Ni(acac)2 was used as a ca…
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…