Materials Literature
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Krejsa, R. J., Bringas, P. Jr. & Slavkin, H. C. 1990 10 15: A neontological interpretation of conodont elements based on agnathan cyclostome tooth structure, function, and development. Lethaia, Vol. 23, pp. 359–378. Oslo. ISSN 0024–1164. Speculation about a conodont-cyclostome connection has led us to search for and e…
Synopsis Oil-in-water emulsions stabilized with nonionic emulsifiers change to water-in-oil emulsions as the temperature rises when the hydrophilic and lipophilic properties of the mixed emulsifier are just balanced. Preparation above the phase inversion temperature followed by rapid cooling yields emulsions that exhi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of polythioamidation in solution. 1. Reaction of mono- and bis(dithioester)s with excess amineMylene Deletre and Guy LevesqueCite this: Macromolecules 1990, 23, 22, 4733–4741Publication Date (Print):October 1, 1990Publication History Published online1…
Abstract New highly sensitive thermoluminescence detectors of universal application on the basis of anion-defect a-Al2O3:C single crystals have been developed. The decisive role of non-stoichiometry in forming luminescence properties of crystals has been ascertained by methods of optical, luminescent and exoemission s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new class of silicon compounds with interesting nonlinear optical effectsGerard Mignani, A. Kramer, G. Puccetti, I. Ledoux, G. Soula, J. Zyss, and R. MeyrueixCite this: Organometallics 1990, 9, 10, 2640–2643Publication Date (Print):October 1, 1990Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous solutions of poly(ethyloxazoline) and its lower consolute phase transitionF. P. Chen, A. E. Ames, and L. D. TaylorCite this: Macromolecules 1990, 23, 21, 4688–4695Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue…
The neutron absorbing ceramic boron carbide was irradiated in the Phenix fast breeder reactor between 600 and 1500 °C. Selected pellets were observed at different magnifications using optical ceramography, scanning electron microscopy, and transmission electron microscopy. The bulk swelling was measured as a function…
The interrelation between the number of nearest-neighbor atomic bonds broken upon formation of a grain boundary in an fcc metal and the related zero-temperature boundary energy is investigated by atomistic simulation. Using both a Lennard–Jones and an embedded-atom-method potential, the structures and energies of symm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn EXAFS and IR study of the CO adsorption-induced morphology change in ruthenium catalystsTakanori Mizushima, Kazuyuki Tohji, Yasuo Udagawa, and Akifumi UenoCite this: J. Am. Chem. Soc. 1990, 112, 22, 7887–7893Publication Date (Print):October 1, 1990Publication History Publ…
Abstract When the density of n‐butyl branches in an ethylene–hexene copolymer increases from 0 to 4.6 butyls/1000 C, the rate of slow crack growth decreases by a factor of 10 4 . The activation energy for the process is nearly independent of branch density and is about 120 kJ/mol. It is the number of tie molecules and…
Two compounds of formula Mn(pfpr),(NITMe) (I) and [Mn(pfpr)2]2(NITMe)(IMHMe) (11), respectively, where pfpr = pentafluoropropionate, NlTMe = 2,4,4,5,5-pentamethyI-4,5-dihydr1o I-f -imidazolyl-I-oxy1 3-oxide, and IMHMe = 2,4,4,5,5-pentamethyl- 4,5-dihydroimidazole3 -oxide, have been synthesized. The latter crystallizes…
Electrochromism was studied with Nb 2 O 5 layers prepared by thermal oxidation of niobium. The Nb 2 O 5 layers are crystalline and the morphology and thickness of these films play an important role in the response of electrochromic process. Cyclic voltammetry and chronopotentiometry were carried out together with elli…
Abstract A fundamental property of electrostatic potentials is their additivity. This study demonstrates that the electrostatic potential of a negatively charged, cation-substituted phyllosilicate layer can be represented as the sum of two potentials. Viewing cation substitution as a defect, one potential is derived f…
Under rigorously dry conditions, nickel oxide sputtered samples undergo a reversible lithium intercalation‐deintercalation process which is accompanied by a net electrochromic effect. The characteristics of the process have been studied by cyclic voltammetry and by optical transmittance. The use of lithium‐intercalate…
The optical constants of MgF(2) (bulk) and BaF(2), CaF(2), LaF(3), MgF(2), Al(2)O(3), HfO(2), and SiO(2) films deposited on MgF(2) substrates are determined from photometric measurements through an iteration process of matching calculated and measured values of the reflectance and transmittance in the 120-230-nm vacuu…
Neutron powder diffraction and conventional dilatometry have been used to investigate the tetragonal‐to‐orthorhombic phase transformation and the orthorhombic‐to‐tetragonal reversion in a high‐toughness magnesia‐partially‐stabilized zirconia. For this material, the onset temperature on cooling for the tetragonal‐to‐or…
Abstract The bubble size distribution created by the expanding foam plays a key role in controlling the load‐bearing and other mechanical properties of the manufactured structural foam part. A numerical method to study the bubble growth and predict the bubble size distribution in polymeric foams is presented. On the m…
The formulation of a general, complete electrical terminal representation of eddy-current loss in transformer windings is presented. It is shown that the effects of mutual resistances must be considered in addition to the familiar winding resistances (self resistances) for a complete description of eddy-current loss.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic pathways for the electroreduction of oxygen by iron tetrakis(4-N-methylpyridyl)porphyrin or iron tetraphenylporphyrin adsorbed on edge plane pyrolytic graphite electrodesChunnian Shi and Fred C. AnsonCite this: Inorg. Chem. 1990, 29, 21, 4298–4305Publication Date (…
Sulfonic acid ring-substituted polyaniline has been synthesized and characterized by elemental analysis, FTIR, UV-vis and electron spin resonance spectroscopy. Approximately 50% of the total number of phenyl rings in the polymer are mono-substituted by -SO− 3 groups. Without external doping, the ring-sulfonated polyan…