Materials Literature
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Porous silicon layers with introduced carbon-containing substances (fullerenes, ultradisperse diamond, carbohydrates) have been studied. It was found that high-temperature annealing of such layers in a hydrogen atmosphere leads to substantial transformation of the photoluminescence spectra. It is assumed that this res…
Abstract We have developed two types of polymer stabilized cholesteric dichroic dye displays. In the first type, an anisotropic polymer network perpendicular to the cell surface was formed by photo‐polymerization in the homeotropic texture in the presence of an electric field. The polymer network enhanced the hysteres…
The Tritium Storage facility of the Tritium Laboratory Karlsruhe (TLK), was recently upgraded by four additional uranium beds and one containing ZrCo. Now it is possible to compare under very similar conditions the sorption/desorption properties of uranium and those of ZrCo. To test the adequacy of ZrCo for routine, t…
To date, the high temperatures (above 140°C) met in some fields in, e. g. , the North Sea, impose the development of innovative corrosion protecting coatings. Thermostable products have been developed from combining a high-Tg thermoplastic and epoxyamine monomers (the latter reducing the viscosity of the former to all…
Increasing resistance and RC time delay induced by an oxidation in a copper line during its lifetime may limit copper-based metallization for technologies with critical dimension. Based on the mechanisms of resistance, constriction resistance and material diffusion, two dynamic models to access lifetime behavior of re…
Abstract In situ Raman spectroscopy was used to study the interaction of iodine‐modified electrolytic silver with oxygen and methanol at atmospheric pressure at temperatures between 25 and 500°C. It is shown that the presence of iodine inhibits the formation of surface oxygen species corresponding to deep oxidation an…
MgO (10.4 mol%)‐doped ZrO 2 powder, which was prepared by coprecipitation and calcination at 750°C, was leached and milled, respectively. The powders were characterized by Auger electron scanning microprobe and XRD technologies. Only the 2.3 mol% MgO was soluble in ZrO 2 ; it stabilized ZrO 2 as the metastable tetrago…
Single crystals of calcium iodate, monohydrate [Ca(IO3)2, H2O] have been grown by gel technique. Prismatic, prismatic pyramidal, needle shaped and hopper crystals were obtained. These crystals were also grown by doping impurities such as copper and iron. Kinetics of growth parameters was investigated. Structural analy…
EPR spectra of the Er 3+ , Nd 3+ , and Ce 3+ ions substituting for the Y 3+ ion in the YAlO 3 yttrium orthoaluminate lattice are studied. The EPR spectra of these rare-earth ions are described by a spin Hamiltonian of rhombic symmetry with an effective spin S =1/2. The principal values of the g tensors were determined…
A nominal 1500 STP-L PAssively Cooled, Electrically heated hydride (PACE) Bed has been developed and tested. The bed contained 12.6 kg of a La-Ni-Al alloy and used aluminum foam to improve heat transfer within the bed. Steady-state temperature measurements made at constant power showed a nonuniform bed temperature pro…
Heteroleptic porphyrinato/phthalocyaninato rare earth(III) triple-decker compounds M 2 ( Por ) 2 ( Pc ') (1a-4a) and M 2 ( Por )( Pc ') 2 (1c-4c) ( M = Eu , Tb ; Por = TDOPP , Pc ' = OOPc or Por = TpClPP , Pc ' = Pc where H 2 (TDOPP) = 5,10,15,20-tetrakis(4-n-dodecyloxyphenyl)porphyrin, H 2 [OOPc] = 2,3,9,10,16,17,23,…
Recombinant proteins may undergo conformational distortion, leading to aggregation and loss of function, when they are expressed in heterologous systems. The structural and functional restoration of such inactive proteins is highly desirable. We have over-expressed recombinant growth hormones from the fish ayu (Plecog…
Studies have demonstrated that serum protein adsorption onto silk fibroin-based biomaterials dramatically changes when the conformation of this natural polymer is rearranged by engineering procedures. In the present study, attention was paid to the binding of fibrin(ogen) to fibroin fibers and regenerated films. The f…
Ga 2 O 3 : Mn phosphor thin films have been prepared by radio frequency (rf) magnetron sputtering of a 2 mol % Mn-doped Ga2O3 target in an oxygen–argon mixture atmosphere. The deposition rate of the films decreased from 14 to 12 Å/min when the working gas pressure decreased from 30 to 2 mTorr, while the O/Ga ratio of…
One of the most important environmental incentives for the polymer industry is to reduce the residual monomer content in polymer products. In addition to the conventional techniques for the reduction of residual monomer, a process based on supercritical carbon dioxide (scCO 2 ) can be a viable alternative as both furt…
The Large Helical Device (LHD) is the largest super-conducting heliotron type device with two continuous helical winding coils. The first plasma shot in the LHD was carried out in March, 1998, and since then, plasma confinement experiments have been performed. As a future plan, a DD plasma experiment, which is an expe…
A sisal fibre has microstructures very different from those of synthetic fibres. The special microstructures consist of parallel cells and a cuticle-interface in the form of a continuous network around each cell. The flexible interface and solid cells play an independent role to toughen and strengthen the sisal fibre,…
Abstract An investigation of drop formation in a recently developed spinning disk atomization (SDA) technique is presented. In‐situ observations of drop formation at the disk rim, using a high speed imaging installation, are made. Atomizations covering two orders of magnitude in flow rate show that ligaments can also…
The role of the Lys68*:Glu265 intersubunit salt bridge that is conserved (Csb) in all known aspartate aminotransferases (AATases), except those of animal cytosolic, Ac (His68*:Glu265), and plant mitochondrial, Pm (Met68*:Gln265), origins, was evaluated in the Escherichia coli AATase. Two double-mutant cycles, to K68M/…
The Gd2O2S:Tb based phosphor coupled with photodetectors has been widely used in digital x-ray imaging applications. The key issues associated with phosphor film are x-ray absorption and conversion efficiency, spatial resolution, deposition uniformity, and integration with the imaging array. In this article we report…