Materials Literature
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An advanced Zircaloy cladding containing niobium has been developed and tested extensively both in long-term out-of-pile autoclave exposures and through high burnup irradiation in a pressurized water reactor (PWR) environment. Tubing of zirconium-based binary alloys containing 0.5, 1.0, and 2.5% niobium, and a quatern…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDramatic effect of the specific solvation on the reactivity of quaternary ammonium fluorides and poly(hydrogen fluorides), (HF)n.cntdot.F-, in media of low polarityDario Landini, Angelamaria Maia, and Alessandro RampoldiCite this: J. Org. Chem. 1989, 54, 2, 328–332Publicatio…
Infinite periodic minimal surfaces are now being introduced to describe some complex structures with large cells, formed by inorganic and organic materials, which can be considered as crystals of surfaces or films. Among them are the spectacular cubic crystalline structures built by amphiphilic molecules in the presen…
The reaction of one‐to‐one molar carbon/silica powder mixtures was studied using simultaneous thermogravimetric analysis and mass spectroscopy with crystalline and amorphous silica. Reaction proceeded via a two‐stage path in which there are at least three identifiable competing global reactions. During the first stage…
Journal URL: http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=%20PC/PC-00a&sessionid=85597106; http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=journal&sessionid=85597106
A methodological review of the production of microspheres/microcapsules by interfacial polycondensation is presented and the mechanisms of particle and capsule formation are discussed. Procedures for interfacial polycondensation employed for the preparation of microspheres/microcapsules involve the polycondensation of…
Gd(hfac),NITEt (hfac = hexafluoroacetylacetonate, NITEt = 2-ethyl-4,4,5,5-tetramethyl-4,5-dihydro-lH-imidazolyl-l-oxyl 3-oxide) crystallizes in the monoclinic space group P21/n with cell parameters a = 2006.4 (4) pm, b = 1706.4 (4) pm, c = 2267.3 (2) pm, fi = 113.82 (1)O, V = 7101.3 X lo6 pm3, Z = 4, and R, = 0.076. T…
Measurements of the complex permittivity of polyimide (PI) films in a temperature range from 80 to 325 K are reported. Two loss peaks show the pronounced influence of absorbed water on this part of the relaxation spectrum. Since these loss peaks can be removed by drying the film, it is concluded that the water dipole…
Europium(II1) and gadolinium(II1) hexafluoroacetylacetonates, M(hfac),, form stable bis adducts with nitronyl nitroxides (2- R-4,4,5,5-tetramethyl-4,5-dihyd1rHo-- imidazolyl-1-oxy13 -oxide, NITR; R = phenyl, ethyl). The magnetic properties of Gd- (hfac),(NITPh), were investigated in the range 1.1-300 K, while all the…
A ruthenium heteropolyanion, SiRu(H2O)W11O395–, has been synthesized which catalyses the liquid phase oxidation of alkanes and alkenes with various primary oxidants including potassium persulphate, sodium periodate, t-butyl hydroperoxide, and iodosylbenzene; the activity and selectivity vary with the oxidant used.
The assessment of the polymorphic composition of calcium carbonate precipitates is important for understanding the mechanism of their formation at conditions of environmental or technological interest. A simple and accurate method is presented, based on infrared spectroscopy, for the quantitative analysis of calcium c…
Blood compatibility of regenerated silk fibroin was ecamined by in vivo blood tests. In vivo tests were made by a method of peripheral vein indelling suture. The coating of sample fibroin on the polyester suture was made by casting either from aqueous or from formic acid solution. The fibroin-coated sutures from aqueo…
The paper shows how a new frequency-dependent impedance formula, derived on the assumption of a solid homogeneous core, may be adapted to permit calculation of the self and mutual impedances of coil sections on a practical transformer core. Experimental measurements, in comparison with calculated values, show that the…
Mammary galactosyltransferase and alpha lactalbumin are the two protein components of lactose synthase which catalyze the transfer of galactose from UDP-gal to glucose in the presence of divalent cations. Recent studies suggest that alpha lactalbumin may have a broader function in modifying cell surface carbohydrates…
Raman spectra of paratellurite, tellurite and pure TeO2 glass were measured. The normal vibration of paratellurite and tellurite was analyzed. The spectrum of pure TeO2 glass were deconvoluted into symmetric Gaussian functions. The normal vibrations of paratellurite are exactly described as combined representations of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ionically crosslinkable polyphosphazene: poly[bis(carboxylatophenoxy)phosphazene] and its hydrogels and membranesHarry R. Allcock and Sukky KwonCite this: Macromolecules 1989, 22, 1, 75–79Publication Date (Print):January 1, 1989Publication History Published online1 May 20…
Collagen undergoes progressive browning with aging and diabetes characterized by yellowing, fluorescence and crosslinking, the cause of which remains unelucidated. As an initial step towards understanding the mechanism(s) of insolubilization of collagen in aging, the major fluorophores/chromophores from the insoluble…
The rate constants for the quenching of the excited states of metal ions and complexes in homogeneous fluid solution are reported in this compilation. Values of kq for dynamic, collisional processes between excited species and quenchers have been critically evaluated, and are presented with the following information,…
The charge-storage mechanism and the design of the ultracapacitor are described. Based on a ceramic with an extremely high specific surface area and a metallic substrate, the ultracapacitor provides extremely high energy densities and exhibits low ESR (equivalent series resistance). The combination of low ESR and extr…
The methionine analog norleucine was produced during the synthesis of bovine somatotropin by Escherichia coli strain W3110G containing the recombinant plasmid pBGH1. Norleucine was generated by the leucine biosynthetic pathway from pyruvate or alpha-ketobutyrate in place of alpha-ketoisovalerate as the initial substra…