Materials Literature
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The wide obtainable range of mechanical compliance encourages the application of helical magnetostrictive springs in force and pressure transducers as well as for direct displacement sensing. In the usual mode of operation, an alternating current is conducted through the magnetostrictive wire, and an output signal (re…
Summary The name hauchecornite has been applied in the literature to a group of minerals with similar crystal structures and the general formula (Ni,Co,Fe) 9 AB S 8 , where A and B are As, Sb, Bi, and Te in two nonequivalent structural sites. A classification of the group is proposed based on the relative abundance of…
Simple binary alkali borate glasses of differing alkali content (alkali = Li, Na, or K) containing sulfur were prepared and their absorption spectra were measured in the range of 200 to 700 nm. The absorption bands obtained were used to determine the stable states of sulfur in these glasses by directly comparing them…
Surfaces of Cu–Be (2%) dynodes activated at various conditions were studied. The mechanism of formation of the BeO layer was studied by means of surface analysis with ESCA, SEM, and AES. Peaks of oxidized Be, O, and a little C were detected but Cu was not found at all in the ESCA and AES spectra of surface products pr…
The inhibition of corrosion of 1018 mild steel in sulfuric acid by thiourea and its derivatives has been investigated. The effectiveness of inhibition is rationalized through the use of two molecular parameters, viz., the electron density associated with the sulfur atom, and the topology of each thiourea molecule. The…
Abstract The thermal decomposition of two isocyanurates and an MDI‐based polycarbodiimide was studied by high temperature infrared spectroscopy, thermogravimetric analysis and differential thermal analysis. The results (confirmed by large scale pyrolysis) show that the s ‐triazine moiety decomposes above 400°C to gene…
"Optical properties of magnetite Fe3O4 ." Philosophical Magazine B, 42(3), pp. 431–432
Abstract BaCdGeS 4 wurde erstmals dargestellt und röntgenographisch untersucht. Es kristallisiert isotyp mit BaCdSnS 4 [1] in der Raumgruppe C −Fdd2 (Nr. 43). Gitterkonstanten: a = 2169, b = 2125, c = 1278 pm. Die charakteristisch verknüpften „Doppeltetraeder”︁ mit gemeinsamen Kanten bilden das strukturbestimmende Tet…
Raman measurements of intermolecular vibrational frequencies, differential scanning calorimetry, and ESR measurements of triplet excitons are reported for crystalline anthracene–tracyanobenzene and various deuterated analogs. Deuteration of all the α- or all β-anthracene positions lowers the temperature of the order–d…
Summary The chemical stabilities of mendipite, Pb 3 O 2 Cl 2 , diaboleïte, Pb 2 CuCl 2 (OH) 4 , chloroxiphite, Pb 3 CuCl 2 O 2 (OH) 2 , and cumengéite, Pb 19 Cu 24 Cl 42 (OH) 44 , have been determined in aqueous solution at 298.2 K. Values of standard Gibbs free energy of formation, ΔG f ° , for the four minerals are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic study of the pyrolysis of neopentane during its induction periodPhilip D. Pacey and Jayantha H. WimalasenaCite this: J. Phys. Chem. 1980, 84, 18, 2221–2225Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue 1 Sept…
ABSTRACT Frustules of a clonal culture of Melosira roeseana Rabenh. were examined with light and scanning electron microscopy. Vegetative valves in the post‐auxospore (full size) stage exhibit a larger width/length ratio than those in the pre‐auxospore (size‐reduced) stage. Cells form chains by linking spines of adjac…
Synopsis Hydrobasaluminite and basaluminite, two hydrated basic aluminium sulphate minerals have been found in the weathering zone of the Oxford Clay at Crook Hill Brickyard, Chickerell, near Weymouth, Dorset. Hydrobasaluminite occurs as a reaction rim surrounding carbonate concretions, and is believed to have resulte…
Abstract The glass transition temperature T g of an elastomer is of great importance with regard to its utilization since at this temperature and below, the material can no longer exhibit rubberlike behavior. In the present study, networks were prepared from atactic poly(vinyl acetate) and poly(isobutyl methacrylate),…
Abstract X‐ray diffraction techniques have been used to investigate the orientation under stress of collagen fibres in pig's descending aortic wall. The variation of the limit value of the incremental modulus as a function of the collagen content seems to suggest that the extra amount of collagen going from the aortic…
A study was conducted which examined the influence of electropolishing on the corrosion resistance of a cold rolled 316L stainless steel. Test specimens were surface prepared to a final mechanical finish of wetted 600 grit SiC paper, prior to electropolishing. An o-H3PO4/Glycerol/H2O electropolishing solution was empl…
A new phase diagram for the system Na 2 O‐Ga 2 O 3 (>50 mol% Ga 2 O 3 ) is presented. It is based on information from differential thermal analysis, X‐ray examination of quenched samples, and a radiochemical technique for determining the compositions of a primary phase and a liquid in equilibrium with it. The diagram…
The damage tracks of high energy ions in dielectric materials can be etched until overlapping conical etch pits are obtained. If the depth of the pits is >lambda/2, an effective graded-index layer with very low reflectivity is obtained. Broadband antireflection treatment achieving reflectivities of <10(-4) has been ap…
By means of X-ray analysis with a stereo-scanning electron microscope, it has been demonstrated that the crystals enclosed in the terminal vacuoles of several species of the desmid genus Closterium are of barium and not calcium sulphate as previously reported. Barium sulphate has also been found in cells of Pleurotaen…
The cholesteric liquid crystal 4”-(2-methylbutylphenyl)-4′-(2-methylbutyl)-4-biphenyl-carboxylate has a pronounced blue phase (BP). DSC calorimetry shows 3 peaks in the cholesteric to isotropic transition region. The phases are identified by polarizing microscopy. The BP has two forms which are separated by a first or…