Materials Literature
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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…
The factors contributing to hydride stability are discussed for a variety of metal hydride systems. The formation of a low-lying hydrogen associated state is a common feature. A significant transition metal character is also found in these states.
Based on accurate X-ray diffraction intensity data collected from spherically shaped single crystals, detailed electron-density distributions have been studied for synthetic mono-oxides, Mg0 (periclase), Mn0 (manganosite) , CoO, and Ni0 (bunsenite) . Mg0 (Sanger, 1969; Vidal-Valat and Vidal,1978) , MnO, and Coo have t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-17 nuclear magnetic resonance spectroscopy of polyoxometalates. 1. Sensitivity and resolutionM. Filowitz, R. K. C. Ho, W. G. Klemperer, and W. ShumCite this: Inorg. Chem. 1979, 18, 1, 93–103Publication Date (Print):January 1, 1979Publication History Published online1…
When a smectic-$A$ phase is composed of chiral molecules, it exhibits an electroclinic effect, i.e., a direct coupling of molecular tilt to applied field. The pretransitional behavior of the electroclinic effect in the $A$ phase is used to study the critical behavior near the second-order, smectic-$A$---smectic-$C$ ph…
Tabulations are presented of relativistic Hartree-Fock atomic form factors F (x,Z), for values of x (=sin(ϑ/2)/λ from 0.01 to 109 Å−1, for all elements Z=1 to 100. For Z=1, F (x,Z) is given by the exact expression of Pirenne. For Z=2 to 98, x=0.01 to 2.0 Å−1, the tabulated values are those of Cromer and Waber given in…
"Corrosion Engineering." British Corrosion Journal, 14(1), p. 4
We develop a new theory of the spin-Peierls transition in spin-\textonehalf{} Heisenberg chains, treating the phonons in a mean-field random-phase approximation (RPA) as in previous work, but calculating the relevant response functions of the spin system using the procedure of Luther and Peschel. We show that the RPA…
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For staining myelin with silver a physical development technique has been devised that can render visible the thinnest fibers in various animal species, including fishes and reptiles, even in the early phase of myelination and may be applied to both frozen and embedded materials. Its principle is as follows: Myelin ca…
The electrochemical polymerization of pyrrole on platinum produces a strongly adhered, durable film with enhanced conductivity and good electrode properties.
The field of fluid mechanics is rapidly advancing, driven by unprecedented volumes of data from experiments, field measurements, and large-scale simulations at multiple spatiotemporal scales. Machine learning (ML) offers a wealth of techniques to extract ...Read More
Intense Raman scattering by pyridine molecules adsorbed on silver or gold aqueous sol particles of dimensions comparable to the wavelength is reported. The degree of intensity enhancement is strongly dependent on the excitation wavelength, with a sharp resonance Raman maximum for excitation at the wavelength of the Mi…
The paper describes the testing and design of tapered-steel cantilevers used as energy dissipating devices, manufactured from either round bar or plate, which can be used in isolation systems to protect buildings or bridge decks against earthquake attack. The steel cantilever energy absorber is a simple device which c…
It is well known that the photovoltage in semiconductors, whatever its nature, cannot exceed the energy gap, which is several volts. For instance, in a homogeneous semiconductor the Dember (diffusion) photovoltage does not exceed the following value [3.6] for an infinitely large intensity of the exciting light: $$ V =…
The g eff =30/7 isotropic signal in the EPR of high-spin Fe 3+ compounds is discussed for both tetragonal rhombic crystal fields by reference to the resonance in calcium tungstate. The Fe 3+ /CaWO 4 EPR signals are shown to arise from Fe 3+ in two slightly different interstitial sites in the crystal; the crystal field…
The electronic response including electron-phonon matrix elements in a simple tight-binding model is calculated for the 'd z2 ' sub-band in 2H-NbSe 2 . This function, in contrast to the bare response, shows a peak in the region of the charge density wave (CDW) wavevector. It is therefore concluded that the CDW is driv…