Materials Literature
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The author introduces a general criterion for leader inception of phase-to-ground air insulation under positive critical switching impulses. This criterion established the correspondence between continuous leader initiation in the vicinity of the highly stressed electrode and conditions prevailing later at the instant…
We study the equilibrium statistics of flexible neutral polymer chains attached by one end onto a flat interface (the polymer « brush »). We account for the finite extensibility of the polymers, adopting a form for the free energy of a stretched chain that diverges as its fully-extended length is approached. Adopting…
Procedures for designing a tunable liquid crystal (LC) electrooptic filter are illustrated. Selective filtering of one of the two mixed laser lines is used as an example for calculation. It is demonstrated that a LC filter can select a desired beam to pass while rejecting the other one, or vice versa, by switching the…
Size measurements of dispersed rat bone crystals show that with age a greater proportion exceeds 400 A in length. The surface fractures of more heavily mineralized bones tend to be smooth and stepped, whereas those of less mineralized bones are fibrous. These observations combined with information reported elsewhere o…
Progress in the development of nonceramic transmission line insulator technology is reviewed. The results of a survey of utilities in the United States are presented to indicate the range of applications, distribution by voltage class, appraisal of performance, and failure modes. It was found that the tracking, erosio…
Data from experiments on animals and humans have supported the development of computer models that predict human response to various combinations of the three main heat stress factors work, clothing, and environment. However, recent application of such models shows that the validity of their output is limited in part…
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…