Materials Literature
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Sm(OH) 2 NO 3 , was prepared by hydrolysis of the corresponding nitrate, leading to a product which is insoluble in water. IR-spectroscopy showed a comparison with the analogous Gd-compound. The temperature of decomposition to SmONO 3 is below 573 K. The structure was refined by the Rietveld technique in space group P…
Abstract The influence of covalency and bridging ligands on cooperative optical effects in dimers with closely coupled lanthanide ions in insulating crystals and binuclear complexes is theoretically treated. It is shown that there is a specific interaction between Ln 3+ ions (which may be called covalent coupling) in…
Owing to macroscopic electric fields arising from thermal fluctuations of a ferroelectric domain wall, the attraction energy of two parallel walls decays at large distances between the walls (h) as ${\mathit{h}}^{\mathrm{\ensuremath{-}}2}$ with a prefactor that is proportional to T and to a ratio of dielectric constan…
Abstract 1-Phenylethanol, acetophenone, 2,3-diphenylbutane, and ethylbenzene are produced in the (porphinato)manganese(III)-catalyzed reaction of styrene with NaBH4 in aerobic benzene–ethanol. Chloro(5,10,15,20-tetraphenylporphinato)manganese(III) ([MnIIICl(tpp)]) and chloro[5,10,15,20-tetrakis(2,4,6-trimethylphenyl)p…
This paper describes a newly developed measurement and identification technique for synchronous machine parameters. The first part presents a technique to generate periodic broadband power signals with a controllable amplitude spectrum using a classic rectifier bridge. These signals are well suited to measure the freq…
Progress in first-principles surface phonon calculation and multiple scattering phonon cross-section calculation has provided a more complete understanding of the localized vibrational modes on unreconstructed metal surfaces. A discussion of some of the new results is given focusing on how the new information resolves…
The effect of In impurity on the dark and photoconductivity and the optical band gap of amorphous (Se0.7Te0.3)100−xInx has been studied. The activation energy ΔE and the pre-exponential factor σ0(0,T) which appear in the dc conductivity are found to increase with increasing In content. The photocurrent, as a function…
The excitation cross-sections of DyI spectral lines in the 262-363 nm spectrum region have been measured by the extended crossing beams method, recording optical signals from the intersection region. Measurements have been made of 21 optical excitation functions at electron energies varying from the excitation thresho…
The effect of hydrogen gas on the properties of tetrahedral amorphous carbon deposited in a filtered cathodic arc has been investigated. It is shown that hydrogen flow rates of less than 0–05 s.c.c.m. give rise to an increase of 3–4% in the film density and in the sp3 content above that of the non-hydrogenated films.…
Abstract A research program at the Center for By-Products Utilization, University of Wisconsin-Milwaukee, is being conducted to develop new low-cost construction materials primarily using coal combustion by-products. This paper reports results of research performed to develop concrete mixture proportions information u…
The authors found that DTPA bis(amide) macrocycles can be prepared in reasonable yields using simple methods and readily available starting materials. Gadolinium complexation is facile and gives rise to monomeric and dimeric species. The "pocket size" influences the solid state structure of the final complex, with Gd-…
Summary Twenty-nine tests in air and 27 tests in a 3.5% NaCl solution were conducted to test the fatigue strength of Grade E 4.5-in.-OD, 16.6-lbm/ft [114-mm-OD, 24.7-kg/m] drillpipe. The effects of stress range, mean stress, corrosion, and upset geometry were tested on the drillpipe body alone and on specimens that in…
Fluorinated poly(imide-amide)s containing pendant cyano groups have been synthesized by solution polycondensation of aromatic diamines which contain cyano groups with diacid chlorides which have both hexafluoroisopropylidene and imnide groups. Thermal crosslinking of these polymers has been attempted in NMP, or by hea…
Article Dislocation Microstructure and Texture Development in Rolled Copper Single Crystals was published on June 1, 1994 in the journal International Journal of Materials Research (volume 85, issue 6).
We have previously proposed a method for depositing silicon dioxide films on Si from tetraethoxysilane (TEOS) using ultraviolet (UV) light from a low pressure mercury lamp. In the method, an organic solution which contains TEOS is spin‐coated onto a Si wafer surface to form a thin organic film which is then exposed to…
Incompresible, thin sheet flows have been of research interest for many years. Those studies were mainly concerned with the stability of the flow in a surrounding gas. Squire was the first to carry out a linear, invicid stability analysis of sheet flow in air and compare the results with experiment. Dombrowski and Fra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Organic Chemical Partition in Soils. 3. Nonlinear Partition from Water-Miscible Cosolvent SolutionsFrank C. Spurlock and James W. BiggarCite this: Environ. Sci. Technol. 1994, 28, 6, 1003–1009Publication Date (Print):June 1, 1994Publication History Publishe…
Abstract Highly crystalline kaolinite has been studied by 27 Al satellite transition magic angle-spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. This technique provides an additional narrowing of the MAS spectral lines by a factor of more than three compared with the width of the prominent central transi…
Abstract X‐ray photoelectron spectroscopy (XPS or ESCA) is one of the most common surface analytical techniques available. It has proved over many years to be invaluable in the analysis of elemental and chemical species on surfaces. The recent developments of this technique towards spatially resolved XPS information h…
Small-angle neutron scattering (SANS) and wide-angle neutron scattering (WANS) measurements on pumice, an amorphous natural aluminosilicate used as support for metals in the preparation of catalysts, are reported. The SANS spectrum indicates the presence of a broad size distribution of pores and the absence of volume…