Materials Literature
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During localized (crevice and pitting) corrosion, a local cell is established between an anode within a crevice or pit and a cathode on the surrounding passive surface. Data are presented to show that concentrated acidic chloride solutions, simulating corrosion product hydrolysis within a crevice or pit, produce poten…
Three series of non-polar acrylic copolymers based on 2-ethyl hexyl acrylate and four series of polar copolymers based on ethyl acrylate were synthesised. Their adhesion performance was assessed by measurement of the force required to detach a probe (tack strength), that required to peel a strip (peel strength) and th…
The title compounds have been prepared and characterised by chemical analysis and X-ray diffraction. By magmetic-susceptibility and magnetisation measurements they are shown to order ferromagnetically at Tc= 58 ± 2 and 55 ± 2 K respectively. Up to ca. 0.7 Tc the magnetisation M(T) obeys the equation 1 –[M(T)/M(0)]=CTγ…
Abstract Es wird gezeigt, daß die mechanische Beanspruchung der Stärke in Form einer plastischen Stärkekornverformung in optimaler Weise deren physikalische und chemische Eigenschaften verändert. Die zur Verformung notwendigen Energiebeträge sind zwar klein, können aber mit den z. Z. bekannten Werkzeugen nicht gezielt…
Polymer coatings were produced on graphite fiber electrodes by electroinitiated polymerization in an electrolytic cell containing monomer. The adhesion of the coated graphite fibers to an epoxy matrix has been measured by single fiber pull-out tests. The measured values of the pull-out force, and scanning electron mic…
The powder mixtures in the AlN-Al2O3 system were hot-pressed under 200kg/cm2 at 1600-2100°C for one hour. The effect of Al2O3 addition on the densification rate was remarkable especially in the AlN rich composition range. Several crystalline phases were observed in the hot-pressed specimens. Oxynitride of spinel type…
Mineralogical properties of two dioctahedral mica minerals with ammonium ions, collected from Ohgidani pottery stone deposit, Ehime Prefecture, are presented in comparison with those of a dioctahedral potassium mica mineral.The two minerals with ammonium are characterized chemically by containing about 2 weight per ce…
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…