Materials Literature
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The microscopic structure of the ${\mathrm{Fe}}^{3+}$-${V}_{\mathrm{O}}$ and ${\mathrm{Mn}}^{2+}$-${V}_{\mathrm{O}}$ pair centers has been considered using the Newman superposition model. This model yields the EPR parameter ${b}_{2}^{0}$ as a function of transition-metal-ion-oxygen distance $d$ and position. It is fou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVanadium-catalyzed epoxidation of cyclic allylic alcohols. Stereoselectivity and stereocontrol mechanismTakashi Itoh, Koichiro Jitsukawa, Kiyotomi Kaneda, and Shiichiro TeranishiCite this: J. Am. Chem. Soc. 1979, 101, 1, 159–169Publication Date (Print):January 1, 1979Publica…
First published in 1979, this is a self-contained account of the theory of surface physics. In drawing together many results only previously reported in research papers, the authors emphasise basic disciplines such as electrodynamics and electron gas theory and demonstrate their application to simple models. Connectio…
Description Those in the fields of corrosion engineering and metallurgy will find that this publication offers and introduction for those unfamiliar to the slow strain-rate technique (SSRT) for stress corrosion cracking (SCC) in metals and relevant information the application of the technique for specific alloys of ch…
Biofilms can develop on almost any surface exposed to an aqueous environment. The biofilm systems that result can be used beneficially, as exemplified by fixed-film wastewater treatment processes (for example, trickling filters and rotating biological contactors). In addition, biofilms play a major positive role in st…
Single-crystal X-ray analysis has shown the tetrameric structure of the low melting point product obtained from the base catalysed condensation of formaldehyde and para-t-butylphenol and its ability to form a stable cage-type clathrate with toluene.
The extensive body of literature published on the physicochemical and catalytic properties of metal zeolites has been reviewed in detail by Minachev and Isakov [1]. Industrial processes in petroleum chemistry involving metal zeolite systems have been examined by Bolton [2], Quite recently Rudham and Stockwell [3] pres…
Refinement of the population and radial dependence of the spherical atomic valence shell is introduced in a general crystallographic least-squares program. The radial dependence is described by an expansion-contraction parameter κ, which, in the nine data sets tested, indicates contraction of positively and expansion…
Highly stable, flexible films of polypyrrole with p-type conductivities of 100 Ω–1 cm–1 have been prepared by electrolytic oxidation of the appropriate pyrrole monomers; similarly prepared films of mixtures of pyrrole and N-methylpyrrole have conductivities between 5 × 10–3 and 100 Ω–1 cm–1 depending upon the composit…
The thermal decomposition of the [Ru(NH3)6]3+ complex ion exchanged in a NaY zeolite followed by reduction in H2 at 623 K leads to highly dispersed Ru metal in the zeolitic pore system. X-ray diffraction techniques have been used to identify atomically dispersed Ru0 inside the sodalite cavity at the site II′. This hig…
The transmission factors tabulated by Rouse, Cooper, York & Chakera [Acta Cryst. (1970). A26, 682-691] for μr < 1 can be expressed as the product of two factors: a scale factor and a Debye-Waller factor. In the case of a sphere or a cylinder, the absorption corrections then reduce to simple adjustments of these parame…
A study is made of the probability distribution of the end to end distance R of a polymer of N segments, length Nl=L, and of self repulsion ω. A simple method, capable of adoption in more complicated problems, is developed, using the idea of an effective step length.The mean square value of R2 is developed as a series…
Low chalcocite is monoclinic, space group P2Ifc, with a unit cell having a = 15.246(4)A, b = 11.884(2)A, c = 13.494(3) A, P = 116.35(1t, and containing 48 Cu2S. Its structure was solved by the symbolic addition method, using 5155 independent intensity data measured with MoKcx radiation on an automatic diffractometer.…
Surface analyses combined with barrier-height studies indicate that Cu2O Schottky barriers made with low-work-function metals (Yb, Mg, and Mn) are essentially Cu/Cu2O cells due to reduction of the Cu2O surface and subsequent interdiffusion phenomena. The copper-rich region essentially determines the barrier height. As…
The SYNROC process proposes to immobilize high-level wastes as dilute solid solutions (i.e. as integral parts of crystal lattices) in the constituent minerals of a synthetic rock formed from a mixture of oxides, principally, TiO2, BaO, ZrO2, Al2O3 and CaO. A new modification of SYNROC, comprising the titanate mineral…
The porphyrin photosensitizer, meso-Tetra (4-N-methylpyridyl) porphine tetraperchlorate binds to calf thymus DNA by intercalation and by external electrostatic association. This was concluded from the results of measruements involving Scatchard analysis, viscometry, thermal denaturation, and circular dichroism.
Abstract The electrical conductivities of dodecamolybdophosphoric acid H3Mo12PO40·29H2O and dodecatungstophosphoric acid H3W12PO40·29H2O crystals were measured. Remarkably high conductivities of 0.18 and 0.17 mho cm−1 at 25°C, and low activation energies of 15.5 and 13.7 kJ/mol were observed for the former and the lat…
The continuous development of the Geometrical Theory of Diffraction (GTD), from its conception in the 1950s, has now established it as a leading analytical technique in the prediction of high-frequency electromagnetic radiation and scattering phenomena. Consequently, there is an increasing demand for research workers…
In clastic situations, primary porositv is a direct function of texture and fabric, including size, sorting and shape (Fig. 1). Grain size, sorting, fabric, as well as sedimentary structures are related directly to sedimentary processes acting at the time of deposition (Fig. 1). Each depositional environment is charac…
Chapter 1 The Importance of Engineering Materials Chapter 2 Forming Engineering g Materials from the Elements Chapter 3 The Role of Chemical and Physical Properties in Engineering Materials Chapter 4 The Role of Mechanical Properties in Engineering Materials Chapter 5 The Role of Tribology in Engineering Materials Cha…