Materials Literature
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An interactive Fortran IV program is described which allows the orientation matrix of a crystal to be determined and refined without ambiguity, from a transmission or reflection Laue photograph. The indexing method is that of Riquet & Bonnet [ J. Appl. Cryst. (1979), 12 , 39–41] applied to a small number of data (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of organomolybdenum compounds. 2. Synthesis, structure and properties of dioxodineopentyl(2,2'-bipyridyl)molybdenum(VI) and of related compoundsFred Ross, Dawn Ross, Elmer O. Schlemper, Gerard Schrauzer, Laura Hughes, and Norman StrampachCite this: Organometallics 19…
Power transformer availability and utilization are key factors in overall transmission system availability and utilization. A Microprocessor based Transformer Analysis System (MTAS) has been conceptually configured to provide improved power transformer availability and utilization through the continuous monitoring and…
A tunable dye laser was used to selectively excite Eu3+ ions in nonequivalent types of crystal field sites in a germinate glass host. The results demonstrate the existence of three major types of sites in this host. In addition, time-resolved spectroscopy results show the presence of energy transfer between ions in th…
Abstract Poly(methyl methacrylate) (PMMA) has been studied by photon correlation spectroscopy in the temperature range 120–150°C. The relaxation functions for longitudinal density fluctuations were determined and analyzed using the empirical function ϕ( t ) = exp[−( t /τ) β ]. The average relaxation times were calcula…
Abstract Ortho‐nitrobenzyl cholate esters have been successfully used as photosensitive components in solution inhibition deep UV photoresists. The photochemical behavior of a variety of substituted o‐nitrobenzyl cholate derivaties has been examined and resist sensitivity is related to the quantum yield of the reactio…
Abstract The crystal structure of a magnesian cronstedtite-2 H 2 from Pribram, Czechoslovakia, was refined in space group C 1 to a residual of 5.4% with 1832 independent reflections. Tetrahedral ordering between Fe 3+ and Si is judged to be complete on the basis of electron density maps, the first confirmation of such…
Abstract Die Schwingungsspektren von festem α‐ und β‐As 4 S 4 und das Ramanspektrum von geschmolzenem As 4 S 4 wurden aufgenommen. Die Zuordnung der Schwingungsfrequenzen wird, vor allem basierend auf Polarisationsdaten, vorgeschlagen. Die Raman‐Schmelzspektren zeigen, daß As 4 S 4 ‐Moleküle (Symmetrie D 2d ) auch im…
The potential emission from aluminum under argon ion bombardment and an enhanced emission under oxygen ion bombardment have been investigated for an aluminum sample. For this a compact energy analyzer was made to measure energy distribution of secondary electrons at certain detection angle as well as total yield for t…
The nature of the blue-emission bands appearing in highly conductive n-type and Ag-ion-implanted cubic ZnS with iodine (ZnS:1) has been investigated by means of time-resolved photoluminescence and electroluminescence measurements. It is found that the n-type crystal exhibits extremely efficient blue luminescence aroun…
The effect of isothermal annealing on residual strain in the lattice of as-deposited basal crystallographic orientation zinc oxide was studied. Films were prepared by rf diode sputter deposition from a zinc oxide target and annealed in air for 5 to 1995 min at 300 or 500 °C. The change in crystallography as a result o…
Poly-para-xylylene family thin films deposited by vapor phase polymerization are pin hole free and are chemically inert to most acids, alkalies, and organic solvents. These properties make this material very attractive as a passivation agent on top of devices. This paper discusses the patterning of such films on plana…
The phase relations in the systems MgO‐Y 2 O 3 ‐ZrO 2 and CaO‐MgO‐ZrO 2 were established at 1220° and 1420°C. The system MgO‐Y 2 O 3 ‐ZrO 2 possesses a much‐larger cubic ZrO 2 solid solution phase field than the system CaO‐MgO‐ZrO 2 at both temperatures. The ordered δ phase (Zr 3 Y 4 O 12 ) was found to be stable in t…
Abstract The temperature dependence of the absorption edge of K 2 SeO 4 is measured in the range 300 to 4.2 K. In this temperature range the dependence of the absorption coefficient on the energy of photons and temperature is described by Urbach's rule. The magnitudes of the band gap obtained are E ∥ = 6.06 and E ⟂ =…
Abstract A copolymer of vinylidene chloride and vinyl chloride containing 13.5% by weight of the latter has been solution blended with four aliphatic polyesters: poly(ϵ‐caprolactone), poly(2,2‐dimethyl‐1,3‐propylene adipate), poly(1,4‐cyclohexanedimethylene succinate), and poly(2,2‐dimethyl‐1,3‐propylene succinate). E…
Abstract Das vollständige Manuskript dieser Zuschrift erscheint in: Angew. Chem. Suppl. 1983 , 427. DOI: 10.1002/ange.198304270
Optical transmission spectra and d‐c conductivity (25°–1000°C) data were obtained on yttria stabilized zirconia (YSZ) single crystals commercially grown by the skull‐melting process. The crystals were doped with up to 2.0 w/o rare earth (Ce, Nd, Er, Pr) and transition (Mn, Fe, Cr, Ni) metal ions, and a few were anneal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of polystyrene molecular weight on the fluorescence of molecular rotorsRafik O. LoutfyCite this: Macromolecules 1983, 16, 4, 678–680Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published inissue 1 April 1983https://pubs.acs.org/d…
The 7.8-kilobase HindIII insert in phage lambda NM589thyA [Borck, K., Beggs, J.D., Brammar, W.J., Hopkins, A.S. & Murray, N. (1976) Mol. Gen. Genet. 146, 199] was confirmed as originating from Escherichia coli by hybridization analysis and was shown to encode the thymidylate synthetase (5,-10-methylenetetrahydrofolate…
X-ray diffraction studies of a D-galactose-binding protein essential for transport and chemotaxis in Escherichia coli have yielded a model of the polypeptide chain backbone. An initial polyalanine backbone trace was obtained at 3.2 A resolution by the molecular replacement technique, using a polyalanine search model d…