Materials Literature
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Amination reactions of 2,6-bis(primary amino)cyclotetraphosphazenes yield not only the expected (amino)cyclotetraphosphazenes but also novel trans-annular bridged bicyclic phosphazenes by an intramolecular substitution pathway. In addition, resins are formed in some reactions by an intermolecular condensation. The eff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIndium dicarbonyl: matrix isolation ESR and IR studyWilliam G. Hatton, Nigel P. Hacker, and Paul H. KasaiCite this: J. Phys. Chem. 1989, 93, 4, 1328–1332Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989ht…
La phase III de K 2 TeBr 6 cristallise dans P2 1 /n avec affinement jusqu'a 0,0563 (a 295 K). La phase II cristallise dans P4/mnc avec affinement jusqu'a 0,0310 (a 418 K)
The rheology of any liquid can now, in principle, be predicted from first principles using the computer simulation technique of molecular dynamics. Computations on simple molecular fluids close to the solid phase co-existence line have revealed that shear thinning and shear thickening, as well as other non-Newtonian e…
Abstract Photochromic processes of 1′-hexyl-5′,8-dimethoxy-3′,3′-dimethyl-6-nitrospiro[2H-1-benzothiopyran-2,2′-indoline] were investigated with laser flash techniques. Photocoloration was found to proceed via the excited singlet state, and the quantum yield of coloration was an order of magnitude smaller than those o…
<div class="htmlview paragraph">Close collaboration between ABB and NGK enabled the development of the rotor for the Comprex<sup>(R)</sup> pressure-wave supercharger (PWS) as an extruded component in pressureless sintered silicon nitride. The ceramic rotor is lighter than the steel rotor, permitting…
The determination of trace-metal impurities in plutonium metal was investigated with the use of anion exchange separation and analysis by inductively coupled plasma/atomic emission spectrometry. Data on recoveries and independent measurements for some 30 elements show precisions and accuracies in the 1–10% range, valu…
During three seasons of excavation at Memphis, Egypt, 350 copper alloy objects were recovered, dating to the fifteenth-twelfth centuries BC. Most of these objects have a remarkably thick, soft, pale green corrosion layer that does not resemble any of the previously described corrosion products. After the first season…
The compositional stratification in solid formed by cooling a binary alloy from below is investigated theoretically and experimentally. It is shown that in order to grow composite solid the boundary temperature needs to be below the eutetic temperature. Two separate cases are considered. In the first, heavy fluid is r…
A simple, stable, and transferable coculture of Clostridium collagenovorans and Methanosarcina barkeri that readily degraded gelatin into methane and carbon dioxide was developed. In monoculture, C. collagenovorans fermented all of the amino acids in gelatin except proline into acetate and carbon dioxide as the main p…
The crystal structure of muconolactone isomerase from Pseudomonas putida, a unique molecule with ten 96 amino acid subunits and 5-fold, and 2-fold symmetries, has been solved at 3.3 A resolution. The non-crystallographic symmetries were used to refine the initial single isomorphous replacement phases and produce an in…
The equation of state of icosahedral ${\mathrm{Al}}_{86}$${\mathrm{Mn}}_{14}$ (i-Al-Mn) at room temperature has been determined up to \ensuremath{\sim}28 GPa using diamond-anvil x-ray powder-diffraction techniques. The i-Al-Mn remained icosahedral over this pressure range; no phase transition was observed. The measure…
Microcrystalline ribbons of Fe-6.5 wt% Si alloy prepared by planar flow on Cu-Be wheel are used. Grain growth during isochronal annealing is measured. We confirmed by X-ray diffraction, transmission electron microscopy and Vicker's microhardness the different phase domains of A 2 . B 2 and DO 3 . Ordering kinetics are…
It is shown that the number of collisions in a system of finitely many hard spheres, which interact through elastic collisions but move freely otherwise in all of 3 R3, is finite.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study on mechanical deformation of highly oriented poly(oxymethylene) by vibrational spectroscopy and X-ray diffraction: stress and temperature dependences of Young's modulusGang Wu, Kohji Tashiro, Masamichi Kobayashi, Tamikuni Komatsu, and Koichi NakagawaCite this: Macrom…
Article on high-temperature fast-flow reactor kinetics studies of the reactions of aluminum with chlorine, aluminum with hydrogen chloride and aluminum monochloride with chlorine over wide temperature ranges.
Isothermal oxidation tests of Zircaloy-4 have been performed in steam/argon mixtures at the temperatures of 1,000–1,490°C to study the oxidation behavior of fuel cladding under severe accident condition in LWRs. The change in mass increase of oxidized specimens was related to the concentration of steam in the atmosphe…
Being the graft of choice, the internal mammary artery (IMA) is increasingly used for coronary artery bypass grafting. Presently, electrocautery is liberally used to mobilize both IMAs. Preservation of IMA flow surface was evaluated by scanning electron microscopy (SEM) after mobilization with either sharp dissection…
Transmission electron microscopy in situ weak-beam investigations have been made on superdislocation cores in Co74Ni3Ti23 single crystals deformed at room temperature. Contrast experiments using [220] reflections show that a core transition of superdislocations from superlattice intrinsic stacking fault dissociation i…
The H 2 O‐catalyzed sintering of MgO in temperature gradients between 1303 and 1233 K is compared to sintering of isothermal samples. Both the changes in sample dimensions in planes normal to the temperature gradients and the increases in density for a fixed sintering time are greater than predicted on the assumption…