Materials Literature
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Abstract Die neue Verbindung Ba 2 Ge 2 Te 5 kristallisiert orthorhombisch in der Raumgrupe Pna2 1 (Nr. 33) mit den Gitterkonstanten In der Struktur sind trigonale Ge 2 Te 6 ‐Prismen über gemeinsame Ecken zu eindimensional unendlichen Ketten verknüpft.
Abstract The ring‐opening polymerization of 3,5‐anhydro‐1,2‐ O ‐isopropylidene‐α‐ D ‐xylofuranose was studied to investigate the selectivity of ring‐opening mode under various polymerization conditions with a number of Lewis acids, anionic and coordinated catalysts. In all the conditions attempted here, the monomer at…
A study has been carried out to determine the thermal insulating properties of expanded vermiculite mineral in the form of loose particles and in the form of compressed vermiculite boards. Measurements show that the thermal con ductivity of the loose vermiculite particles is in the range of 0.0633-0.0738 w/(m °C) and…
As microvascular surgery has developed, the necessity for smaller arterial prostheses of less than 2 mm in internal diameter (ID) has increased markedly. Glutaraldehyde-stabilized human umbilical arteries with 1.5 to 2.0 mm ID are smaller than any other graft material currently available. This study was designed to de…
Fission product fractional release rates, K, used in the Albrecht-Wild model and measured at Kernforschungszentrum Karlsruhe and Oak Ridge National Laboratory can be fitted well by a single straight line for each fission product over the entire temperature range of the data when ln K is plotted as a function of 1/T. P…
We present direct measurements of the temperature of shock-loaded polymethylmethacrylate (PMMA) in the 0.5 – 3.0-GPa range. The experimental technique is based on embedding a very thin (1 μm thick or less) copper thermistor in the shocked sample and recording its resistance changes during the 5–8 μs of a dynamic exper…
Abstract The chemical ionization mass spectra of some tert ‐octylphenol ethoxylates and linear alcohol ethoxylates have been determined using methane and ammonia as reactant gases. Proton, [C 2 H 5 ] + and [C 3 H 5 ] + adducts were observed with attachment on the ring as well as on the oxyethylene chain for the tertia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntrapment of functionalized ethylene oligomers in polyethyleneDavid E. Bergbreiter, Zonghan Chen, and Ho Pin HuCite this: Macromolecules 1984, 17, 10, 2111–2116Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 October…
A series of electroactive polymers was synthesized by incorporating pendant anthraquinone groups on a polystyrene backbone. The spacing between electroactive groups and the overall chain length were varied independently. Symmetrical, reversible cyclic voltammograms were obtained from polymer solutions. Linear plots of…
The influence of octahedral replacement of Al3+ by Fe3+ on the infrared spectra of montmorillonites in the domain of OH vibrations is presented. The obtained results suggest that in the domain of OH-bending vibration, the absorption band from 870 cm−1 (Al3+ -OH-Fe3+) can not be detected in the spectra of montmorilloni…
Abstract The temperature dependence of the fundamental absorption edge of SbSI is studied in the range 320 to 5 K. In the paraelectric phase the edge is described by the Urbach's rule. The pertinent parameters of the ferroelectric phase are found to be temperature dependent. The influence of spontaneous polarisation o…
The Zr-2.5 wt% Nb pressure tubes used in CANDU reactors are manufactured via hot extrusion, followed by cold-working. This manufacturing process causes the crystallographic structure of the alloy to be strongly textured and the grains to be elongated in the axial direction. The mechanical properties are consequently a…
The dependence of grain‐boundary resistivity and resistance per square centimeter of grain‐boundary surface on grain‐boundary density (D) in yttria‐stabilized zirconia was investigated using reported data. The grain‐boundary resistivity increased with increasing D in the high‐D region but was independent of D in the l…
SUMMARY The amounts and rates of release of the different categories of soil K were measured on 21 soils from field experiments in England, Wales and West Germany using a calcium saturated cation exchange resin. The soils contained various amounts of exchangeable, fixed and matrix K; some contained no fixed K at all.…
Abstract A single crystal of vivianite, Fe 3 (PO 4 ) 2 ·8H 2 O, has been investigated at room temperature using Raman spectroscopy. Using the site symmetry method, we have identified the internal modes of the PO 4 group. For the stretching modes we have observed: ν 1 ( A g )=950.5 cm −1 . ν 3 ( A g )=990.0 cm −1 , ν 3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of point efficiencies on sieve trays. 2. Multicomponent systemsHong Chan and James R. FairCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 4, 820–827Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 Oct…
By means of M\"ossbauer-effect spectroscopy, we study changes in the electronic structure of iron induced by substitutional impurity W atoms in a series of ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{W}}_{x}$ alloys containing up to about 9 at.% W. From the measured changes of the hyperfine (hf) fields and isomer shifts…
Abstract When reacted for periods of 5–10 min at temperatures of about 280–300°C in the presence of certain organic phosphites polymers that contain available carboxy and aliphatic amine groups undergo amidation. This reaction can increase the molecular weight of many aliphatic polyamides by their self‐reaction in an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlue gas denitrification. Selective catalytic oxidation of nitric oxide to nitrous oxideHans T. Karlsson and Harvey S. RosenbergCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 4, 808–814Publication Date (Print):October 1, 1984Publication History Published online1 May…
The macromolecular properties of 17 virgin commercial arterial prostheses and a series of explanted prostheses, both manufactured from poly(ethylene terephthalate) (PET) yarns, have been studied by gel permeation chromatography (GPC) and by differential scanning calorimetry (DSC). Only small differences were found bet…