Freshwater Algae of the Southeastern United States. Part 5: Chlorophyceae: Zygnematales: Desmidiaceae (Section 3)
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Fission Gas Behavior during Postirradiation Annealing of Large Grained UO2Fuels Irradiated to 23 GWd/t
Fission gas behavior of UO2 fuel pellets with controlled microstructure irradiated to 23 GWd/t in a test reactor has been studied by using a postirradiation annealing experiment. Four types of fuel pellets with or without additives were examined : (1) un-doped standard (grain size: 16/μm), (2) un-doped large grained (…
Interdependence of Hydrogen and Microporosity in Magnesium Alloy AZ91
<div class="htmlview paragraph">The relationship between hydrogen gas and microporosity in magnesium alloy AZ91 was quantified, refuting the belief that hydrogen levels less than the maximum solid solubility are of no detriment. Sand castings were made from melts containing measured levels of hydrogen gas, and t…
Crystal structure of KBSi3O8 isostructural with danburite
Abstract The crystal structure of KBSi 3 O 8 (orthorhombic, Pnam , with a = 8.683(1), b = 9.253(1), c = 8.272(1) Å,, V = 664.4(1) Å 3 , Z = 4) has been determined by the direct method applied to 3- dimensional rcflection data. The structure of a microcrystal with the dimensions 20 × 29 × 37 μm was refined to an unweig…
Surface Charge Characteristics of Hydroxyaluminosilicate‐ and Hydroxyaluminum‐Montmorillonite Complexes
Abstract The electric charge and surface characteristics of montmorillonite (Mt) complexed with hydroxy‐Al (HyA) or hydroxyaluminosilicate (HAS) ions were studied in the pH range of 4 to 8. The HAS or HyA ions were prepared from solutions containing HyA ions and orthosilicic acid at an Al concentration of 4 mmol L ‐1…
Zur Kristallchemie von Ba3In2Zn5O11. Ein tOxoindat/zinkatsol;zinkat mit Zn10O20‐ und In4O16‐Makropolyedern und erstmals O2− in tetraedrischer Koordination durch Zn2+
Abstract Mit einer Schmelzmitteltechnik wurde erstmals Ba 3 In 2 Zn 5 O 11 dargestellt und an Einkristallen röntgenographisch untersucht. Es kristallisiert kubisch, in der Raumgruppe T ‐F 4 3m, mit a = 13,3588 Å und Z = 8. Zn 2+ ist tetraedrisch von O 2− koordiniert und bildet Zn 10 O 20 ‐Makropolyeder. Ferner wird de…
Third-order nonlinear optical response of some tetrasubstituted cumulenes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order nonlinear optical response of some tetrasubstituted cumulenesIvan Kminek, Josef Klimovic, and Paras N. PrasadCite this: Chem. Mater. 1993, 5, 3, 357–360Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1…
Transient axial solution for the reflection of a spherical wave from a concave ellipsoidal mirror
A transient solution is derived for the reflected pressure along the axis of symmetry of a concave ellipsoidal mirror. The incident field is a spherical wave produced at the near focus of the mirror. It is assumed that the characteristic wavelengths are short in comparison with the minimum radius of curvature of the m…
Critical behavior at nematic–smectic-A1phase transitions. I. High-resolution x-ray-scattering and calorimetric study of the liquid-crystal octyloxyphenylnitrobenzoyloxy benzoate
High-resolution x-ray scattering and ac-calorimetric measurements have been carried out near the nematic--smectic-${\mathit{A}}_{1}$ phase transition of the pure liquid-crystal compound octyloxyphenylnitrobenzoyl- oxy benzoate (${\mathrm{DB}}_{8}$${\mathrm{ONO}}_{2}$). Several forms of the structure factor S(q) for fi…
Measurement of the specific heat capacity of the electron-beam grahite calorimeter.
This report describes the design and construction of apparatus to measure the specific heat capacity of solid materials in the temperature range IB-32°C. The apparatus is designed to minimize heat losses from the sample in order to measure the specific heat to an accuracy of better than :to.2% at the 95% confidence le…
Bias-voltage- and bias-light-dependent high photocurrent gains in amorphous silicon Schottky barriers
Experimental results of very large, long-wavelength photocurrent gains in amorphous silicon-based Schottky barrier structures are reported. It is shown that these occur for devices in the space-charge current regime operated at forward bias voltages past the flatband condition. The analysis of microelectronic and phot…
The rare-earth-element chemistry of allanite from the Grenville Province
ABSTRACf The results of electron-microprobe analyses of 38 samples of allanite from granitic rocks and calcite veins in the Grenville province of southeastem Ontario'and southwestem Quebec are presented. Allanite from granitic rocks show a w.ider rang e o!ffn contentsthanttrosefromcarbonateveins.Thesamplesofallanitest…
Assessing polymer crystallizability from nonisothermal crystallization behavior
Abstract Crystallization of polymers plays an important role in polymer processing because the structure developed during crystallization influences the mechanical and physical properties of the polymer product. The crystallization of polymers takes place under nonisothermal crystallization is essential for optimizing…
Progress in scanning electron microscopy of frozen-hydrated biological specimens.
Modern scanning electron microscopy yields structural information down to 2 to 5 nm from thin, beam transparent biological specimens. This paper examines the possibilities of garnering this level of structural information from bulk, frozen-hydrated samples. Freeze-fractured, frozen-hydrated yeast cells, frequently tak…
Synthesis of polystyrene and styrene copolymers by reactive extrusion
Abstract Due to the ever growing and more complex demands on the properties of polymer materials, raw material producers and plastic processing industries are more and more interested in the continuous synthesis and modification of polymers. In this article the production of polystyrene and styrene–isoprene copolymers…
INFLUENCE OF AN SiO2/CYCLOHEXANE INTERFACE ON THE PHOTOCHEMISTRY OF ANTHRACENE
Abstract We have investigated the effect of added Si0 2 on the photochemistry of anthracene, 1, in cyclohexane. Adsorption of 1 onto the Si0 2 surface from cyclohexane follows a Freundlich adsorption isotherm indicating interactions between 1 and the surface over a distribution of adsorption sites. In the absence of o…
Enhanced Tm3+ blue emission in Tm, Yb, co-doped fluorophosphate glasses due to back energy transfer processes
Up-conversion emission spectra of fluorophosphate glasses doped with Tm3+ and co-doped with Tm3+ and Yb3+ ions were obtained under two different excitation wavelengths (657 and 683 nm). Both samples show a stronger emission centered at 450 nm than the ones centered at 478 and 363 nm when 3F2 level of Tm3+ is excited a…
Electrochemical synthesis of Co, Ni, and Zn complexes with 2‐Pyrrole‐[N‐( o ‐hydroxyphenyl)methylimines]: The crystal structure of 2,2′‐Bipyridine bis{2‐[(2‐pyrrole)methylimino]5‐methylphenolato}nickel(II)
Abstract The electrochemical oxidation of anodic cobalt, nickel, and zinc in acetonitrile containing both 2‐pyrrole‐[N‐( o ‐hydroxyphenyl)methylimines] (H 2 L) and a bidentate ligand (1, 10‐phenanthroline(phen) or 2,2′‐bipyridine(bipy)) yielded compounds of general formula M(HL) 2 · phen and M(HL) 2 · bipy (M = Co, Ni…
Phase Equilibria in the System ZrO 2 ─InO 1.5
Phase equilibria in the system ZrO 2 ─InO 1.5 have been investigated in the temperature range from 800° to 1700°C Up to 4 mol%, InO 1.5 is soluble in t ‐ZrO 2 at 1500°C. The martensitic transformation temperature m → t of ZrO 2 containing InO 1.5 is compared with that of ZrO 2 solid solutions with various other trival…
Recent developments in the field of star‐shaped polymers
Abstract The interest for star‐shaped polymers arises from their unique structure and enhanced segment density. This paper will review the different methods of preparation for star‐shaped polymers. Two cases of special interest will be considered in greater detail: the core‐first method which gives access to end‐funct…