Materials Literature
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Abstract The scope of this paper is to review peroxide curing of ethylene-propylene elastomers, where apart from crosslinking, other reactions occur, such as chain scission, which account for the drop in physical properties. The results are compared with an alternative crosslinking system which is being assessed in ou…
Phase equilibria in the system HfO 2 –Y 2 O 3 –CaO were studied in the temperature range 1250° to 2850°C by both experimental methods (X‐ray phase analysis at 20° to 2000°C, petrography, annealing and quenching, differential thermal analysis in He at temperatures to 2500°C, thermal analysis in air using a solar furnac…
The electronic Raman spectrum of ${\mathrm{Fe}}^{2+}$ ions in ${\mathrm{FePS}}_{3}$ and ${\mathrm{FePSe}}_{3}$ layered crystals is studied and interpreted in a quasimolecular approach for the iron and its environment. We apply crystal-field theory, and the transition probability for the electronic Raman process is com…
Lactobacillus plantarum ATCC 8014 grew on melibiose at 30 C, but not at 37 C, although it grew on galactose or lactose at either temperature. ATCC 8014 grown on lactose at 30 or 37 C accumulated melibiose slowly, suggesting that melibiose may partly be transported by a lactose transport system. A lactose-negative muta…
The radiation absorbed dose to non-water equivalent materials of interest in radiotherapy is the dose to lung and the dose to bone. The measurement and calculation of dose to the lung has been of great interest and much effort has gone into the development of accurate lung dose calculation methods. The radiation absor…
The presence of elemental sulfur caused pronounced changes in the passivation of iron. In higher alkali solutions, soluble divalent iron sulfur complexes are formed involving S22– ions. The trivalent oxides dissolve forming trivalent iron sulfur complexes, which cause complete passivation on further polarization of th…
Wool fibre tenacity and its relationship to staple strength was studied in a pen-feeding trial of 40 New Zealand Romney ewes. A method for estimating fibre tenacity is described based on normalizing fibre breaking load by cross-sectional area measured on fibre fracture-surfaces. The validity of this protocol was demon…
Abstract Durch Tempern inniger Gemenge der binären Oxide [KO 1,1 , CsO 1,2 , RuO 2 ; K:Cs:Ru = 2,2:1:1; Ag‐Zylinder, 750°C, 34d] wurde erstmals CsK 5 Ru 2 O 9 = CsK 5 [RuO 5 ] [RuO 4 ] in Form dunkelgrüner Einkristalle erhalten. In diesem Oxid tritt Ru 6+ in zwei unterschiedlichen „Anionen”︁ auf (Tetraeder und trigona…
The room-temperature radiative properties of YBa2Cu3O7−δ superconducting films with varying oxygen content (δ = 0 to 1) on a LaAlO3 substrate are investigated. The fitting of reflectance spectra using thin-film optics and the Drude-Lorentz model function with multiple oscillators determines the optical constants. The…
Poly(3-hydroxybutyrate) (PHB) microspheres containing 10wt% of lastet, an anticancer drug, were prepared by a solvent-evaporation process. The release rate of lastet from PHB microspheres in vitro (in 0.01M phosphate buffer) was significantly increased by incorporating glycerol tristearate as an additive. The signific…
Ilyanassa obsoleta larvae have two calcium carbonate-containing organs, shell and statocyst, which are derived from five micromere cells (2a, 2c, 2d, 3c, 3d). "Internal shell," an abnormal, internal calcium carbonate mass, was previously observed when cells which normally induce shell and statocyst were removed. This…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing expansion of halo dithiolanes and dithianes: a facile synthesis of medium-ring dithiacycloalkenesZhihua Sui, Paul S. Furth, and James J. De VossCite this: J. Org. Chem. 1992, 57, 24, 6658–6662Publication Date (Print):November 1, 1992Publication History Published online1…
Abstract It is a well‐known fact that the permeability of polymer materials increases as the temperature increases. As the temperature drops to its original level, the permeability in many instances does the same. When packages are processed in an autoclave, the material will be exposed to both high temperature and hi…
The FPL (Forest Products Laboratories) Process for preparing aluminum for structural adhesive bonding has been used in the aerospace industry since the early 1950's. Problems were encountered with the use of the process when the industry changed from phenolic to epoxy adhesives. In-service disbonds followed by corrosi…
For pt.XIV see ibid., vol.8, no.5, p.34 (1992). The effects of X-ray irradiation during partial discharge measurements are discussed. The partial discharge phenomena in cavities is detailed. A full-scale system capable of testing 138-kV-class post insulators under combined electric stress and X-ray radiation was imple…
The distribution, cytological organization and differentiation of non-articulated laticifers in the primary and mature tissues of Calotropis gigantea (Linn.) R.Br., were studied by the use of optical and electron microscopy. Laticifers occur in the cortex, vascular bundle and pith of the plant axis. At the earliest de…
Diffraction gratings are known to exhibit anomalous behavior at certain critical wavelengths or incident angles. These traditional anomalies manifest themselves as abrupt variations in diffracted order efficiency or grating absorption, while their angular position remains unchanged as predicted by the grating equation…
Poly(methy1 acrylate) was grafted onto chitin in an aqueous medium by using the ceric ion as a redox initiator in the presence of 10−4 M nitric acid and oxygen from the atmosphere. The grafting percentage turned out to be dependent on reaction temperature, time, and initiator concentration, but it was found to be inde…
Sidewall films can be formed during etching by redeposition of etch products and sputtered material from the bottom of the etched structure, by deposition of material sputtered from the mask edge, or by deposition of material from the plasma space. For each process the geometrical characteristics are calculated. A dis…
F-actin purified from rabbit skeletal muscle undergoes reversible dissociation when subjected to hydrostatic pressures up to 240 MPa. Dissociation and reversibility were detected by the following procedures: fluorescence spectral changes observed under pressure, when either intrinsic tryptophan or pyrenyl emission of…