Materials Literature
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The energy transfer properties of the Tm, Ho:LiYF 4 are examined, and special attention is given to the Tm( 3 F 4 ) to Ho( 5 I 7 ) transfer dynamics and equilibration. The measured transfer times are compared with the values calculated on the basis of the static Forster-Dexter and the migration-assisted Burshtein ener…
Extended x-ray absorption fine structure measurements from Er-implanted Czochralski-grown Si samples, which exhibit strong luminescence at 1.54 μm, reveal a local sixfold coordination around Er−not of Si−but of oxygen atoms at an average distance of 2.25 Å. By contrast, similar concentrations of Er implanted in high p…
We have studied the origin of visible photoluminescence of Ge nanocrystals in SiO2 glassy matrix. Spectroscopic analyses of Ge nanocrystals indicate that the room-temperature photoluminescence comes from Ge nanocrystals of diameter of 4 nm or less. High-resolution electron microscopic studies imply that the structure…
Process for getting crack-free lead zirconate titanate (PZT) thin films micropatterned on Si substrate is demonstrated. The PZT film was deposited at temperatures below 300°C by magnetron sputtering using a ceramic target, and then etched before annealing. After annealed above 500°C to get perovskite phase, the PZT fi…
Article Structure solution and Rietveld refinement of beryllophosphate-H zeolite was published on November 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 201, issue 1-4).
The amount and quality of clay minerals in Hungarian soils show considerable differences. In relation to this, in long‐term multi‐location field experiments, different levels of K supply have developed even when fertilized at the same K fertilizer rate. In an incubation experiment (4 weeks at constant temperature and…
Abstract Photosensitive polyamic acid involving substituted 3, 5‐diaminobenzamide has been developed for photopatternable polyimidesiloxanes. This precursor, formulated with photosensitizers, was used to develop fine patterns by i‐line UV exposure. The curing of polyamic acid was investigated by using FTIR and physica…
In 1959 the famous bongo payer and Nobel laureate Richard Feynman first posed the question: “Why can't write the Encyclopedia Britannica on a pinhead?”. If an electron beam could be focused to a spot only one atom in diameter, he reasoned, then it might interact with individual atoms on a surface and writing on an ato…
Abstract The scope of this paper is to review peroxide curing of ethylene-propylene elastomers, where apart from crosslinking, other reactions occur, such as chain scission, which account for the drop in physical properties. The results are compared with an alternative crosslinking system which is being assessed in ou…
Phase equilibria in the system HfO 2 –Y 2 O 3 –CaO were studied in the temperature range 1250° to 2850°C by both experimental methods (X‐ray phase analysis at 20° to 2000°C, petrography, annealing and quenching, differential thermal analysis in He at temperatures to 2500°C, thermal analysis in air using a solar furnac…
The electronic Raman spectrum of ${\mathrm{Fe}}^{2+}$ ions in ${\mathrm{FePS}}_{3}$ and ${\mathrm{FePSe}}_{3}$ layered crystals is studied and interpreted in a quasimolecular approach for the iron and its environment. We apply crystal-field theory, and the transition probability for the electronic Raman process is com…
Lactobacillus plantarum ATCC 8014 grew on melibiose at 30 C, but not at 37 C, although it grew on galactose or lactose at either temperature. ATCC 8014 grown on lactose at 30 or 37 C accumulated melibiose slowly, suggesting that melibiose may partly be transported by a lactose transport system. A lactose-negative muta…
The radiation absorbed dose to non-water equivalent materials of interest in radiotherapy is the dose to lung and the dose to bone. The measurement and calculation of dose to the lung has been of great interest and much effort has gone into the development of accurate lung dose calculation methods. The radiation absor…
The presence of elemental sulfur caused pronounced changes in the passivation of iron. In higher alkali solutions, soluble divalent iron sulfur complexes are formed involving S22– ions. The trivalent oxides dissolve forming trivalent iron sulfur complexes, which cause complete passivation on further polarization of th…
Wool fibre tenacity and its relationship to staple strength was studied in a pen-feeding trial of 40 New Zealand Romney ewes. A method for estimating fibre tenacity is described based on normalizing fibre breaking load by cross-sectional area measured on fibre fracture-surfaces. The validity of this protocol was demon…
Abstract Durch Tempern inniger Gemenge der binären Oxide [KO 1,1 , CsO 1,2 , RuO 2 ; K:Cs:Ru = 2,2:1:1; Ag‐Zylinder, 750°C, 34d] wurde erstmals CsK 5 Ru 2 O 9 = CsK 5 [RuO 5 ] [RuO 4 ] in Form dunkelgrüner Einkristalle erhalten. In diesem Oxid tritt Ru 6+ in zwei unterschiedlichen „Anionen”︁ auf (Tetraeder und trigona…
The room-temperature radiative properties of YBa2Cu3O7−δ superconducting films with varying oxygen content (δ = 0 to 1) on a LaAlO3 substrate are investigated. The fitting of reflectance spectra using thin-film optics and the Drude-Lorentz model function with multiple oscillators determines the optical constants. The…
Poly(3-hydroxybutyrate) (PHB) microspheres containing 10wt% of lastet, an anticancer drug, were prepared by a solvent-evaporation process. The release rate of lastet from PHB microspheres in vitro (in 0.01M phosphate buffer) was significantly increased by incorporating glycerol tristearate as an additive. The signific…
Ilyanassa obsoleta larvae have two calcium carbonate-containing organs, shell and statocyst, which are derived from five micromere cells (2a, 2c, 2d, 3c, 3d). "Internal shell," an abnormal, internal calcium carbonate mass, was previously observed when cells which normally induce shell and statocyst were removed. This…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing expansion of halo dithiolanes and dithianes: a facile synthesis of medium-ring dithiacycloalkenesZhihua Sui, Paul S. Furth, and James J. De VossCite this: J. Org. Chem. 1992, 57, 24, 6658–6662Publication Date (Print):November 1, 1992Publication History Published online1…