Materials Literature
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Although the glycosidic fraction from the dried leaves of Gymnema sylvestre R. BR., gymnemic acid, was reported to be effective for diabetes, it showed little inhibitory activity on the increase of serum glucose level in oral glucose-loaded rats. From the glycosidic fraction, six triterpene glycosides, gymnemosides a,…
The short and long-term dielectric behavior of a number of representative electrical insulating systems is compared in the presence of space charge. Dielectric materials, used both in the communications and power application areas, are considered. In this overview, particular attention is given to thin inorganic films…
A new type of polymer–silica composite based on aramids of either linear or non-linear structure has been prepared successfullyvia the sol–gel process. The linear polyamide chains were prepared by the reaction of a mixture of m-phenylene and p-phenylene diamines and terephthaloyl chloride in dimethylacetamide. The non…
The complexes [Ag(AsPh 3 ) 4 ]BF 4 and [Au(AsPh 3 ) 4 ]BF 4 were prepared from AgBF 4 and 4 equivalents of AsPh 3 , and from equimolar quantities of [Au(AsPh 3 )Cl] and AgBF 4 and 3 equivalents of AsPh 3 , respectively, in dichloromethane solution. Single crystals of the two compounds are isomorphous (trigonal, space…
Zinc porphyrins have been widely used as surrogates for chlorophyll (which contains magnesium) in photosynthetic model systems and molecular photonic devices. In order to compare the photodynamic behaviour of Mg- and Zn-porphyrins, dimeric and star-shaped pentameric arrays comprised of free-base (Fb) and Mg- or Zn-por…
In this study, we attempted to prepare microspheres from a microbial biodegradable polyester, i.e. polyhydroxybutyrate (PHB) as a potential chemoembolization agent. The drug loaded PHB microspheres were prepared by a solvent evaporation technique, in which methylene chloride, distilled water, and polyvinyl alcohol wer…
A new multicamera soft x-ray detector system has been constructed for the pumped divertor phase of JET to provide improved spatial and temporal resolution. It is based on 12 compact pinhole cameras each of which uses a 35 element PIN photodiode array. The cameras are housed in a secondary vacuum and view the plasma th…
Investigation of structural and magnetotransport properties of ${\mathrm{L}}_{2\mathrm{/}3}$${\mathrm{A}}_{1\mathrm{/}3}$${\mathrm{MnO}}_{3}$ (A=Ca,Sr) oxides reveals a gradual increase of the magnetic frustration with bending of the Mn-O-Mn bonds. The relative strength of competing magnetic interactions is controlled…
BaCe 0.9 Nd 0.1 O 3-α (BCN) ceramic is known to be an excellent high-temperature proton conductor and is a candidate electrolyte for use in solid oxide fuel cells, hydrogen or steam sensors and steam electrolysers. In this work, the chemical stability of BCN was investigated systematically by combining XRD and DTA–TG…
The solution and solid-state structures of lanthanide complexes of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetryltetramethylenetetra(benzylphosphinate), L1a, and of its o-, m- and p-methoxybenzyl analogues (L2, L3, L4) have been investigated by NMR, relaxometry, crystallographic and photophysical methods. It has been…
In this paper, we present a new electromigration reliability diagnosis tool (iTEM) for CMOS VLSI circuits. Unlike previous electromigration reliability tools, iTEM can estimate the interconnect temperature rise due to joule heating and heat conduction from the substrate using a newly developed lumped thermal model. By…
A series of new layered inorganic−organic nanocomposites, with organic functionalities directly bonded to an inorganic framework via the Si−C bond, were prepared by a template sol−gel synthesis. These layered Al− and Mg−silsesquioxanes were precipitated at room temperature by addition of aqueous base to an alcohol sol…
Thin epitaxial BaTiO 3 (BTO) films having a high crystallinity and uniformity of grains were deposited on the SrTiO 3 (STO) substrates. When the oxygen pressure is from 0.04 to 70 Pa the lattice constant decreases from 4.1100 to 3.9972 Å and the orientation normal to the substrate changes from (001) to (100). The surf…
Type X collagen is a transient and developmentally regulated collagen that has been postulated to be involved in controlling the later stages of endochondral bone formation. However, the role of this collagen in these events is not yet known. In order to understand the function of type X collagen, if any, in the proce…
Abstract The non‐parallel chain structure determined for γ‐phase isotactic polypropylene (γ‐iPP) is confirmed by Rietveld analysis for highly isotactic high molecular mass iPP crystallized at 200 MPa. The new refinement shows that: (i) stereoregularity or crystallization pressure do not significantly influence the lat…
A method of improving the efficiency of thermoelectric energy conversion by utilizing potential barriers is considered. Since potential barriers act as carrier energy filters, elimination of lower energy carriers results in an improvement of the efficiency of thermoelectric energy conversion (energy filtering method).…
Flame-retarded epoxy composites and phenolic composites containing fiberglass, aramid (Kevlar® 49), and graphite fiber-reinforcements were tested using the NASA upward flame propagation test, the controlled-atmosphere cone calorimeter test, and the liquid oxygen (LOX) mechanical impact test. The upward flame propagati…
Following a prepolymer mixing process, polyurethane (PU) anionomer dispersions were prepared from polyethylene adipate glycol (PEA), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and dimethylol propionic acid (DMPA) as a potential ionic centre. Effects of prepolymer molecular weight, PEA molecular w…
The photochemical reduction of CO2 at a TiO2 surface in the presence of H2O has been investigated. CO, CH4, H2, and some higher hydrocarbons CnHm, attributed to C2H6, could be detected as photoproducts by mass spectrometry. No oxidation products of H2O could be found. The temperature dependence of the reaction was inv…
Among many transition-metal oxides, zirconium oxide is found to be active for photocatalytic reduction of carbon dioxide to carbon monoxide with hydrogen in the gas phase.