Materials Literature
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Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
First a rigorous formulation is presented for the scattering of a uniform plane wave by an infinite dielectric grating waveguide, under the most general condition of oblique incidence. The results are then applied to the analysis of the guidance of waves by the dielectric grating waveguide. By using a simple coordinat…
In order to improve the understanding of de‐field‐induced resistance degradation, ceramic capacitors made from perovskite‐type titanates are formally treated as solidelectrolyte cells. Based on the consideration of the interfaces in these cells, the degradation process can be unambiguously deduced from the well‐known…
Singly substituted derivatives of cinnamaldehyde were tested as corrosion inhibitors for API J55 steel in static experiments conducted in 75% HCI at 65°C for 24 h. Four substituent sites were examined. Corrosion rates measured with added surfactants were correlated with physicochemical properties of the inhibitors, in…
Dammann gratings are binary phase gratings that are used to produce a one- or two-dimensional array of equal-intensity light spots. Recently, Dammann gratings have become of interest for their ability to provide the optical power supply to an array of optical logic devices from a single laser source. We present here a…
Furfuryl alcohol can be transformed in a simple way into the long-awaited sulfur analog of porphyrin, the tetrathiaporphyrin dication 1, isolated as the perchlorate. The key to the synthesis is a remarkably straightforward sulfur/oxygen exchange in tetraoxaporphyrinogen. As would be expected from the relatively large…
J. V. Smith and W. L. Brown. Feldspar Minerals: 1. Crystal Structures, Physical, Chemical, and Microtextural Properties. 2nd Edition. Berlin, Heidelberg and New York (Springer-Verlag), 1988. xviii + 828 pp., 352 figs. Price DM360.00. - Volume 53 Issue 373
The high temperature phase transitions and conductitivity have been studied in some single crystals of the alkaly dihydrogen phosphates and dihydrogen arsenates. The quite different nature of the high temperature phase transitions in KDP and RDP in contrast with those in CDP and CDA is established. It is shown that th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of poly(methyl methacrylate). 3. Polymer with head-to-head linkagesLewis E. Manring, Dotsevi Y. Sogah, and Gordon M. CohenCite this: Macromolecules 1989, 22, 12, 4652–4654Publication Date (Print):December 1, 1989Publication History Published online1 May 2…
A theory is presented to describe the nucleation and subsequent growth of weakly inhomogeneous lamellar phases from a supercooled disordered phase. Detailed calculations are performed for the case of near-symmetric diblock copolymer melts, although the results have relevance for other physical systems in the Brazovski…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and solid- and liquid-state characterization of a hexameric cluster of titanium(IV): Ti6(.mu.2-O)2(.mu.3-O)2(.mu.2-OC4H9)2(OC4H9)6(OCOCH3)8S. Doeuff, Y. Dromzee, F. Taulelle, and C. SanchezCite this: Inorg. Chem. 1989, 28, 25, 4439–4445Publication Date (Print):Dece…
The characteristic properties of vitreous electrolytes are summarised for convenience under the three headings of ‘continuity’, ‘variability’ and ‘vulnerability’. These cover respectively the temperature and compositional dependences of conductivity, and non-additive behaviour such as the mixed alkali effect. Some asp…
MgTiO 3 cristallise dans R3 avec affinement jusqu'a 0,0257. Mg 2 TiO 4 cristallise dans Fd3m ou P4 1 22 apres recuit a 973 K ou 773 K. MgTi 2 O 5 cristallise dans Bbmm et possede une structure pseudobrookite
Abstract Thermal characteristics of chemically synthesized polyaniline with various dopants have been studied by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), infrared spectroscopy, gel‐permeation chromatography (GPC), and chemical titration. The HCl‐doped polyaniline shows three major wei…
The microphase separation transition for asymmetric triblock and (A–B)m star copolymer melts is investigated following a mean-field approach proposed by Leibler for diblock copolymer melts. Continuous transitions are found in all triblock architectures and in stars for any m at some composition fc. The phase diagram f…
Polysaccharides constitute a structurally diverse class of biological macromolecules with a wide range of physicochemical properties, which are the basis for the different applications in the broad field of pharmacy and medicine. Besides the classical applications of these biopolymers in industry and pharmaceutical pr…
Abstract Mesomorphism and the molecular orientation of 1,4‐phenylene bis{4‐(6‐(acryloyloxy)hexyloxy)benzoate} ( 1 ) and its derivative with a methyl‐substituent in the central phenylene group ( 2 ) are studied. The methyl group affects the transition temperatures and the thermodynamic parameters, but not the order par…
Abstract The influence of external mechanical stress on the nematic‐isotropic phase transformation of nematic elastomers was investigated. The experimental results of IR‐dichroism measurements in the nematic phase and stress‐optical measurements in the isotropic phase are in good agreement with the theoretical predici…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompact polymersHue Sun Chan and Ken A. DillCite this: Macromolecules 1989, 22, 12, 4559–4573Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue 1 December 1989https://pubs.acs.org/doi/10.1021/ma00202a031https://doi.org/10…