Materials Literature
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Narrowing the performance deficit between design intent and real-time environmental and energy performance of buildings is a complex and involved task, impacting on all building stakeholders. Buildings are designed, built and operated with the use of increasingly complex technology and throughout their building life-c…
Measurements of centreline velocities in front of rectangular unflanged exhaust hoods, with areas between 25 and 900 cm2 and aspect ratios (ratio of slot length to its width) between 1: 1 and 16: 1 have shown that for a given face area and volume flow the velocity at a fixed point decreases as the aspect ratio increas…
The transport of fructose in Bacillus subtilis was studied in various mutant strains lacking the following activities: ATP-dependent fructokinase (fruC), the fructose 1-phosphate kinase (fruB) the phosphofructokinase (pfk), the enzyme I of the phosphoenolpyruvate phosphotransferase system (the thermosensitive mutation…
A general energy analysis formulated for the study of fabric mechanics is applied to the biaxial-deformation properties of the plain weft-knitted structure by assuming quarter-loop symmetry. The basic equations of equilibrium and the boundary conditions for plain-knitted fabrics are derived without assuming any detail…
The synthesis and spectral properties of several phosphorus complexes of tetraphenylporphine (TPP) are reported. The compounds appear to have the form (TPP)P(V)X2 +Y− as previously reported by Gouterman et al. for the analogous octaethylporphyrin (OEP) complexes. The electronic and nmr spectra show a striking dependen…
Abstract Thermal decomposition mechanisms of poly(vinyl chloride) (PVC) and the effects of a few metal oxides on the pyrolysis of PVC were previously reported. In the present work, 33 metal oxides were investigated to determine their effects on the thermal decomposition of PVC, by using a pyrolysis gas chromatograph.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluxional behavior of potentially bidentate phenanthroline, bipyridine, naphthyridine, pyridazine and phthalazine ligands in platinum complexesKeith R. DixonCite this: Inorg. Chem. 1977, 16, 10, 2618–2624Publication Date (Print):October 1, 1977Publication History Published o…
Defect energy was calculated as a function of dihedral angles of the bonds in a point dislocation for sequences of conformations that resulted in motion of the dislocation along the polyethylene chain. Paths that presented low barriers to diffusive motion of the defect were found by incrementing, in a particular seque…
The polyesterification between adipic acid and ethylene glycol in nonequimolar ratios was investigated. The kinetic equations obtained were quite different from those obtained by Flory in equimolar systems. The kinetic equations obtained in this study were −d[COOH]/dt = k[COOH][OH]2 for uncatalyzed polyesterification…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational and functional aspects of the reversible dissociation and denaturation of glucose dehydrogenaseHans E. Pauly and Gerhard PfleidererCite this: Biochemistry 1977, 16, 21, 4599–4604Publication Date (Print):October 1, 1977Publication History Published online1 May…
The conversion of monoclinic selenium to trigonal selenium is studied by x-ray diffraction, optical microscopy, and thermal analysis between 343 and 487 K. Below the melting temperature of the monoclinic crystal the process is topochemical, but not topotactic. The melting of the monoclinic crystals to the pure Se8- ri…
Abstract The polymerization of perfluorocarbons and fluorohydrocarbons was investigated by using both continuous and pulsed rf discharge (100 μsec on and 900 μsec off). Plasma polymerization of perfluorocarbons is generally slower than that of hydrocarbons, which seems to be due to the absence of contribution of fluor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange in a chloride- and adeninium-bridged linear trimer of copper(II): octachlorobis(adeninium)tricopper(II) tetrahydrateDavid B. Brown, John R. Wasson, James W. Hall, and William E. HatfieldCite this: Inorg. Chem. 1977, 16, 10, 2526–2529Publication Date (Print)…
Mechanical relaxation time in polymeric glass has been previously shown to shift to shorter times under tensile strain, and this phenomenon has been attributed to the increase in free volume accompanying the deformation. To be consistent with this concept, the excess enthalpy associated with free volume must also incr…
A 20-parameter least-squares fit to the levels of Ho3+:LaCl3 observed by Dieke and Pandey has been obtained. The results are in substantial agreement with their assignments and with the subsequent analysis of Rajnak and Krupke. A considerably more extensive atomic Hamiltonian was used, including operators for two- and…
Damage rate data for pure Cu and dilute Cu alloys with Au, Be, Pd and Sb measured between 50K and 107K under 3 MeV electron irradiation have been evaluated with regard to the correlated recombination. By applying the diffusion theory of a three-dimensionally migrating interstitial to the results, the temperature-depen…
Data have been collected from a standard silicon sample with Cu Kβ radiation selected by means of a pyrolytic graphite monochromator mounted in the scattered beam. The peak shapes can be described reasonably well by Lorentz-type functions, but not by a Gaussian function. These results have been applied to the profile…
We show that evaporated tungsten trioxide amorphous layers commonly used in electrochromic displays actually have the composition WO2.7Hy (0.2<y<0.5). We emphasize that coloration of virgin transparent films can be obtained without injection of any external ion into the layer, and further that around a c…
Abstract Heat precipitation fibril formation in collagen solutions depends upon the prior thermal history of the solution. Collagen solutions were heat precipitated to various extents at 30°C, cooled, and then brought to a second precipitation. Kinetic analysis of the secondary precipitation demonstrated that only the…
The more-than-linear increase of elastic modulus with draw ratio, the gradual disappearance of meridional SAXS maximum, the drastic drop of elastic modulus after annealing and its recovery upon standing at room temperature if the sample was annealed with fixed ends so that it did not shrink, and the shape stability of…