Materials Literature
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The effect of bumetanide upon the endocochlear potential (EP) was examined in 46 guinea pigs. The EP was reduced with dosages of 5 mg/kg or more. The maximum depression of the EP (reduction to -30 to -40 mV) was obtained at a dosage of 30 mg/kg. The recovery of the potential was incomplete at any dosage within three h…
A green species has been generated both by oxidation of gaseous xenon with a dioxygenyl salt and by reduction in antimony pentafluoride solution of the XeF+ cation, e.g. with water or a suitable metal; the Raman, u.v.-visible and e.s.r. spectra of the product are all consistent with the identity Xe2+, representing the…
The stress-induced products formed by cold-rolling in Ti-11∼20%Mo and Ti-16%V binary alloys have been examined by means of optical microscopy, X-ray diffraction and transmission electron microscopy.Plate-like products in a Ti-11%Mo alloy with a meta-stable β phase were {332} twins and a small amount of orthorhombic ma…
From u.v. absorption and fluorescence measurements it is suggested that N-(dialkylaminomethyl)phthalimides fluoresce(weakly) from the second excited singlet state (π,π*), and that the lowest energy singlet state (n, π*) is non-fluorescent. Phosphorescence occurs from the lowest triplet state at 77 K, and in ethanol so…
A new method for analyzing $\ensuremath{\alpha}$-nucleus optical potentials is presented. It consists of adding to the conventional Woods-Saxon real potential an extra potential given by a Fourier-Bessel series. The coefficients of the series are determined by least-squares fit to experimental cross sections for elast…
Mechanical properties of a wide range of commercially-produced outerwear fabrics have been analyzed in terms of the elastic and frictional resistance to bending and shear deformations. The fabrics tested include wool and wool-synthetic blend woven fabrics, wool and textured polyester double-knits, and synthetic warp-k…
The breakdown characteristics of gas insulated systems were investigated for DC and switching impulse voltage superposed upon DC of opposite polarity in laboratory-clean conditions. The breakdown voltage of a SF6 gas gap for DC voltage is approximately 80 percent of that for AC crest value at pressure of 3.5kg/cm2 abs…
Abstract Different minerals characterize the three fractions in the different weathering zones. Halloysite in the clay fraction especially in the α and γ zones is due to a physical comminution of silt‐sized tubes. Strong peaks for halloysite (XRD) in the silt and sand fractions in these zones is shown (SEM) to be from…
A series of Fe-xMo alloys, where x ranged from 0 to 6 Wt%, were used to determine the effect of molybdenum concentration on the repassivation kinetics of iron within a crevice. Results show that concentrations of molybdenum greater than 5 Wt% are effective in increasing the repassivation rate. Resistance of these allo…
The mechanism of the rate determining step (r.d.s.) for dissolution of well characterised, very perfect MgO “smoke” crystals, has been re-evaluated by studies of the dependence of log (rate) on pH. Surface potential barrier modification is the most likely r.d.s. when solution diffusion is not limiting. Electron micros…
The 1978 proceedings of the American Association of Cost Engineers include papers on second unit scheduling concerns on a dual-unit nuclear project, the economics of energy transport via metallized iron ore, cost estimating for geothermal power systems, economics of long-distance coal slurry pipeline-methodology, and…
The hydrogen bond plays an all important role in determining the physical properties of a variety of classes of ferroelectrics and antiferroelectrics of which potassium dihydrogen phosphate (KDP), lithium trihydrogen selenite and Rochelle salt are examples. This role is evidenced by the usually large isotope effects o…
Several compounds with the pyrochlore structure have been investigated. Dielectric and structural studies of the compound Cd2NB2O6S show the existence of three phase transitions at 106°C, 184°C and 282°C. The ferroelectric properties have been studied by several methods (x-Ray, DTA, dielectric and dilatometric methods…
The presintered layer structure bismuth compounds of PbBi2Nb2O9, Na0.5Bi4.5Ti4O15, PbBi4Ti4O15 and Pb2Bi4Ti5O18 are hot-worked by press forging under the maximum load of 200 kg/cm2 at a temperature of 1000°C to 1200°C. The reduction ratio of height is more than 70%. The well-oriented polycrystalline samples with an or…
Absorption and magnetic circular dichroism (m.c.d.) spectra of the α polymorphic form of a series of phthalocyanines CH2Pc, CoPe, NiPc and CuPc have been observed between 12 000 and 40 000 cm–1. Band shape analysis of both the absorption and m.c.d. data reveals Davydov splittings in both the Q and B (Soret) bands and…
A comparison between the vibrational properties and stereochemistry of [Co(pc)(4Me-py)2] and [Fe(pc)-(4Me-py)2][pc = phthalocyaninato(2 –), 4Me-py = 4-methylpyridine] is carried out by using far-i.r. spectroscopy and X-ray diffractometry. The crystals of the two complexes, based on the packing of [M(pc)(4Me-py)2] addu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon Phthalocyanine-Siloxane Polymers: Synthesis and 1H Nuclear Magnetic Resonance StudyJohn B. Davison and Kenneth J. WynneCite this: Macromolecules 1978, 11, 1, 186–191Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissu…
The first photochemically generated, ‘cation-locked’ crown-ether is reported.
The crystal and molecular structure of the title complex has been determined from single-crystal X-ray diffraction data and refined to R 0.068 for 1 423 independent reflections. Four oxygen-bridged cubane-type molecules with a Cu4O4 core, having crystallographically imposed S4 point symmetry, occupy a tetragonal unit…
Corrosion of base metal alloys was studied by placing the alloys in artificial saliva for 2 months and then determining the concentration of metal ions in the saliva. The distribution of the attack on the surface was examined. The results indicated that the amount of metal ions in the artificial saliva could be relate…