Materials Literature
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The distribution of luminescent Eu 3+ ions in crystals with the cubic bixbyite-type structure is subject of debate. In this work, the actual occupancy of the two cation sites available for europium in yttria and lutetia nanocrystals with sizes of 10 - 20 nm has been evaluated by means of 151Eu Mössbauer spectroscopy.…
Günter Reiter and Jens-Uwe Sommer (eds.) Springer-Verlag (2003), 386 pp. ISBN: 3-540-44342-8 $67 / €72.95
In this study a new model for calculating shielding requirements in diagnostic X-ray facilities is presented. It is based on the combination and modification of models and concepts originally proposed by other authors in order to calculate barrier requirements in diagnostic X-ray facilities accurately and realisticall…
For the first time, direct experimental evidence of a new mechanism for the quenching of fluorescence of organic ligands (L) in complex compounds with lanthanide ions (Ln3+) is obtained. By analogy with the mechanism of luminescence quenching upon pair interactions of Ln3+ ions in inorganic systems, this mechanism is…
In this paper, the infrared optical properties of diamond films grown on silicon substrates by means of the microwave plasma chemical vapour deposition (MPCVD) method were first studied by infrared spectroscopic ellipsometry in the photo energy range of 0.1–0.4 eV. Using the effects of annealing treatment on the extin…
Powders of yttria–alumina materials YAlO3 (YAP) and Y3Al5O12 (YAG) have been prepared from commercially-available preformed sols, and the products were compared with those from preformed sol-nitrate, nitrate-citric acid and alkoxide methods. The preformed sol route offers an alternative cheap and rapid method, and dif…
Shrimp shell waste from seafood restaurants and canned shrimp industries is potential to be used as chitosan source. This material contains 18.1% of chitin which could be converted into chitosan through demineralization, deproteination and deacetylation process. Chitosan is fine chemical used to adsorb fat from body,…
Development of rewetting correlation formula was the key to predict fuel-cladding temperature after Boiling Transition (BT). Japanese BWR utilities and vendors performed some tests of rewetting and made two rewetting correlation formulas. The effect on fuel integrity after BT depends on temperature of fuel rod and tim…
Abstract The mixed-valent mercury(II) tellurite(IV) tellurate(VI), Hg 2 Te 2 O 7 , is dimorphous and crystallizes in two modifications with slightly different density, named α -(high density) and β -(low density). Colourless single crystals of both modifications were prepared simultaneously by chemical transport react…
The paper presents the fundamentals of composite right/left-handed (CRLH) transmission lines and materials, and proposes an accurate circuit model of these structures for the design of practical applications. Three novel applications of CRLH meta-structures, developed at UCLA, are demonstrated: an arbitrary coupling-l…
The influence of the grain size of the prior-austenite on the hydrogen-induced delayed fracture property was investigated for a medium carbon tempered martensitic steel (JIS-SCM440) with a tensile strength of 1400MPa. Thermomechanical treatment, which consists of a warm working at 873K by multi-pass bar rolling of tem…
Cyclic deformation behaviour and dislocation structure of Ti–5 at.% Al single crystals oriented for single prism slip have been studied. Ti–5 at.% Al tested under total strain control (Δεt/2) displays an initial slight cyclic hardening followed by a striking softening period, and then a saturation stage is reached in…
We have synthesized azobenzene-based molecules containing either one or two chiral groups. A cholesteric phase can be induced by adding the chiral azobenzene compounds to a host nematic liquid crystal. We investigated the effects of the trans-cis photoisomerization of the chiral azobenzene compounds on the properties…
With the increasing interest in new artificial materials ranging from meta-materials to photonic bandgap materials there is a growing need for accurate models of artificial materials. We examine the design of a three-layer structure with an artificial dielectric as an anti-reflection-coating on both sides of a dielect…
Raw cottons contain a number of noncellulosic materials that are generally considered to be surface related and may therefore affect fiber quality. Chemical tests are conducted on cottons originating from different U.S. growing locations to determine reducing sugars, wax, metal contents, and total alcohol extractable…
This paper deals with the mechanical properties and air permeability of lightweight wool blend apparel fabrics. We have studied mechanical responses in uniaxial tensile and tear tests of gray-state fabrics, and low deformation characteristics (i.e., bending rigidity, shear rigidity, and extensibility) in FAST tests of…
Hardness indentations with a Vickers pyramid under a load as low as 0.1 N applied at room temperature induce amorphization in single‐crystal mullite when applied to the (001) crystallographic face. Different zones of damage were identified via TEM. Directly under the indenter, in the region of high‐compressive stress,…
Abstract A pair of dicationic metalloporphyrins with only two meso-substituents, i.e. copper(II) and zinc(II) complexes of 5,15-bis(1,3-dimethylimidazolium-2-yl)porphyrin (H2-1), have been synthesized by insertion reaction of the metal ions. Interactions of [5,15-bis(1,3-dimethylimidazolium-2-yl)porphyrinato]copper(II…
Abstract Syntheses of novel 1,3-diphenyldisiloxanes were investigated. 1,1,3,3-Tetrachloro-1,3-diphenyldisiloxane (1) and 1,1,3,3-tetraisocyanato-1,3-diphenyldisiloxane (2) were obtained by vapor-phase hydrolytic condensation of trichloro(phenyl)silane and triisocyanato(phenyl)silane, respectively. The reactions of 1…
g The EPR spectra of Cu 2+ and VO 2+ ions in [NH 4 H 3 (C 2 O 4 ) 2 ]·2H 2 O single crystals were recorded at room temperature in three orthogonal planes. The spectra indicate that the Cu 2+ and VO 2+ ions substitute NH +4 ions. The principal values of the and A tensors were determined. The ground state wave function…