Materials Literature
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The critical heat capacity associated with the nematic (N) to smectic-A (Sm-A) phase transition has been studied using high-resolution ac calorimetry in two mixtures of polar octyloxycyanobiphenyl (8OCB) and nonpolar terephtal-bis-butylaniline (TBBA). The slope ${\mathrm{dT}}_{c}$/dX of the N--Sm-A phase boundary, whe…
Abstract Cr, Co and Rh were introduced into P‐1, P‐2 and P‐2W nickel boride catalysts as promoters. The substrates of cyclohexanone and cyclohexene were used to examine the effects of those promoters on nickel borides for hydrogenation reactions. On cyclohexanone with strongly‐polared carbonyl group, Cr, Co and Rh are…
In garment manufacture, causes of sewability problems have to be identified so that remedial actions can be applied. In the case of seam pucker, establishing the cause of the problem is not easy because many different variables can produce the same fault. Existing methods of identifying seam pucker due to structural j…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new electron rich network polymer: poly(1,3,5-triaminobenzene)I. Johannsen, J. B. Torrance, and A. NazzalCite this: Macromolecules 1989, 22, 2, 566–570Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989ht…
Abstract Using the conception of an extended object (Umezawa et al.) based on the continuum theory of elasticity, monovacancy formation energies are calculated. Anisotropy is included for cubic symmetry by means of a first order approximation to the Green's function tensor and some tensor algebraic calculations. The l…
Progress towards the absolute prediction of the constitutive rheological relations of more complex fluids using the methods of non-equilibrium molecular/particulate dynamics simulations is reviewed. The approaches are based upon the initial use of simple hard-, soft-, and colloidal-sphere effective pair potentials and…
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.