Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Summary A mathematical model was developed to describe the scale-inhibitor-adsorption squeeze process. The objective of this study was to create a tool that will predict the duration of a squeeze treatment, given the operating parameters and the rock and inhibitor properties. Assuming that there is local equilibrium b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcited states of titanium(2+): sharp-band and broad-band near-infrared luminescence from titanium(2+) in magnesium chloride and magnesium bromideStuart M. Jacobsen, Hans U. Guedel, and Claude A. DaulCite this: J. Am. Chem. Soc. 1988, 110, 23, 7610–7616Publication Date (Prin…
A characterization of crystallographic unit cells as vectors in a Euclidean six-dimensional space (E6 in the usual mathematical notation; here termed G6) is introduced, in which the non-triclinic Bravais lattice types form one-, two-, three- and four-dimensional linear subspaces. This formalism makes the determination…
Abstract If a metal surface is in contact with an aggressive atmosphere, then thin electrolyte layers are formed on top of the metal surface which may be as thin as a few monolayers of water. – Two techniques are described which allow to analyze the electrochemical processes involved in the corrosion of such a surface…
Mechanisms of machining (abrasive), fatigue and transfer wear are reviewed in the context of the interfacial shear stress (adhesive) and surface roughness (deformation) conditions in which they occur. In the first part it is shown how model predictions of surface flow, friction and wear may be mapped on to a field wit…
Summary Deposit formation was measured in a model laboratory plant in which whole milk was in contact with a heated surface at 100 °C for 1 h. The effect of the interfacial properties of various poly mer-coated surfaces on the amount and the adhesion strength of deposit was determined. The nature of the surface influe…
To dispel a widespread but erroneous belief among physicists that the penetration of ac magnetic fields into normal metals is determined by the usual skin depth δ alone, a simple analysis is presented of two problems in each of which a different length scale determines the effective screening. For a cylindrical can of…
We report X-ray diffraction, density, ultrasonic velocity and refractive index studies in the N(p-n-pentyloxy benzylidene) p-n-alkylaniline compounds, viz. 50.5, 50.6 and 50.7. The nematic-smectic A (NA) transition is found to be weak first order in 50.6 while it is second order in 50.5 and 50.7. The salient features…
The least-squares method incorporating orthonormal relation between wavefunctions is formulated. The method fulfils the idempotency condition and allows the representation of wavefunctions to be obtained from charge-density distributions measured by the X-ray diffraction method. The present method can be applied to bo…
In order to determine the empty cell gap of a liquid-crystal (LC) cell to better than 1% accuracy, the empty LC cell has been modeled as an optical medium consisting of seven layers with an air gap representing the true cell gap in the middle layer. The given index of refraction and thickness for each layer, optical r…
The sensitivity and selectivity of double modulation Fourier transform infrared reflection absorption spectroscopy for absorbing species on a reflecting surface has been employed for the in situ analysis of low-temperature plasma enhanced chemical vapor deposition formed SiO2 films deposited on HgCdTe, silicon, and al…
A Therasonic 1030 (Electro-Medical Supplies) therapeutic ultrasound generator operating at 1 MHz continuous wave was used to insonate aerated water at two temperatures, 22 degrees C and 37 degrees C. Using various acoustically reflecting materials, sound fields were set up with different standing wave components. Meas…
Energies of formation of the members of the homologous series SrO · nSrTiO 3 , through a Ruddlesden‐Popper type of superlattice ordering, have been examined by employing atomistic computer simulation techniques. Results of the calculations have been shown to provide a theoretical basis for the observation that a limit…
The first-order Raman spectra of ZnWO4 single crystals have been obtained. All the vibrational frequencies are assigned by group theory. Among them the Bg modes at 269, 166, and 147 cm−1 and Ag mode at 124 cm−1 are reported for the first time. In view of x-ray structure data of ZnWO4, we suggest that the frequencies o…
Abstract— Two easily prepared derivatives of chlorophyll,purpurin–18 and chlorin p 6 , are potent sensitizers of cell killing by low‐intensity red light. The internal anhydride group inpurpurin–18 provides the potential of covalently linking in one step the chlorin to cell targeting agents such as antibodies.
The reflectivity of a multilayer dielectric coating deposited upon the end facet of a symmetrical dielectric slab waveguide is investigated for both TE and TM waves. The integral equation satisfied by the field in the junction plane is solved numerically through a Fourier representation and an iteration process. The p…
Abstract The α relaxation of isotropic and drawn poly(vinyl alcohol) dried gel films was studied using dynamic mechanical analysis. The temperature of the relaxation T α increased from 160°C in the isotropic gel to 220°C in a fiber drawn 19 ×. The relaxation, which is associated with the crystalline regions of the mat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipalladium complexes with N,N'-diphenylbenzamidine bridging and chelating ligands. Synthesis and structural and electrochemical studiesC. L. Yao, L. P. He, J. D. Korp, and J. L. BearCite this: Inorg. Chem. 1988, 27, 24, 4389–4395Publication Date (Print):November 1, 1988Publ…
The relative effect of 13 anionic species, in conjunction with hydrogen and sodium cations, on the stress corrosion cracking (SCC) behavior of lightly sensitized AISI(1) 304 stainless steel (SS) was investigated in constant extension rate tests (CERTs) at 289 C in water with 0.2 ppm dissolved oxygen at total conductiv…
Abstract Donor‐ und Acceptorsubstituenten stabilisieren cyclische (4n)π‐Elektronensysteme und destabilisieren solche mit (4n + 2)π‐Elektronen. Entsprechendes gilt für Übergangszustände von pericyclischen Reaktionen, und das erklärt das Auftreten von dipolaren Zwischenstufen bei symmetrieerlaubten Cycloadditionen und s…