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Showing 1 to 20 of 24 for “"X-ray diffraction analyses"”.
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Mica stabilization with lime, portland cement and lime-calcium carbonate
… and calcium hydroxide in the stabilized soil, x-ray diffraction analyses, differential thermal analysis, and thermagravimetric analyses were made. Results show the appearance of calcium carbonate and absence of calcium hydroxide.
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The Chemistry of Some Triosmium Alkylidene and Alkylidyne Cluster Complexes
… NMR spectroscopy together with single-crystal X-ray diffraction analyses.
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Substitution chemistry of the cobalt complexes RCCo3(CO)9 (R = H, CHO) with the diphosphine ligand: 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd). Syntheses, X-ray structures and reactivity.
… and 5 have been structurally characterized by X-ray diffraction analyses.
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Studies of Iridium Carbonyl Cluster Complexes
… and have been characterized by single-crystal X-ray diffraction analyses. Each new compound consists of a closed triangular cluster of three iridium atoms with two or three diphenylgermylene ligands bridging the Ir-Ir bonds. Separately, compound 5 was converted to 4 in 68% yield by …
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THE STRATIGRAPHIC POSITION OF FOSSIL VERTEBRATES FROM THE POJOAQUE MEMBER OF THE TESUQUE FORMATION (MIDDLE MIOCENE, LATE BARSTOVIAN) NEAR ESPAÑOLA, NEW MEXICO
… petrology, paleocurrent, and sedimentary facies analyses. After x-ray diffraction analyses of claystones within lithosome B, mordenite was discovered, which is a zeolite mineral commonly found within volcanic rocks. This is significant because the presence of mordenite confirms Cavazza’s (1986) …
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Fundamental processes in growth of reactive DC magnetron sputtered thin films
… the variation of the mass deposition rate. The X-ray diffraction analyses suggest that, within the crystalline phase, nitrogen atoms occupy oxygen sites, resulting in an unchanged zirconium oxide structure.
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Hydrogeochemical Evaluation and Impact of Remediation Design on Arsenic Mobility at Historical Gold Mine Sites
… electron microscopy, and synchrotron micro-X-ray diffraction analyses, which were used to characterize the mineralogical composition of the tailings. Groundwater and surface water flow regimes throughout the tailings were defined through the use of piezometers and hydraulic conductivity …
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Metals hosts in the Pennsylvanian Hushpuckney and Stark Black Shales from Selected Areas in Kansas City
… of an organic-rich black shale lower part and gray shale, organic poor upper part. The main rock-forming minerals in the shales include silicates (quartz and clay minerals), carbonates (calcite and dolomite), and phosphate (francolite). Various sulfide/selenide minerals (pyrite, sphalerite, …
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Sedimentology of the Bullion Creek and Sentinel Butte formations (Paleocene) in a part of southern McKenzie County, North Dakota
… petrography, scanning electron microscopy, and X-ray diffraction analyses of sand stones, limestones, and claystones, respectively.</p> <p>Two paleochannel systems are present in the Bullion Creek Formation in the study area. These systems are deeply incised and vertically stacked, with low …
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RECONSTRUCTING PHOENICIAN POTTERY PRODUCTION IN SARDINIA: A MULTI ANALYTICAL CHARACTERIZATION OF SAMPLES FROM THE SITE OF PANI LORIGA (8-7TH CENTURY BC) AND MONTE SIRAI (6-5TH CENTURY BC)
… located in southwestern Sardinia, Italy. The analyses aimed to unveil the archaeological context, with provenance, raw materials and production processes. Seven amphora samples from Monte Sirai were first analysed as comparative materials for the largest group of samples from Pani Loriga, …
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Hydrogeology of the Hillsboro landfill, Hillsboro, North Dakota
… of the covered landfill trenches. </p><p> X-ray diffraction analyses revealed that, of the clay minerals present, smectite is dominant. Distribution of smectite in the Hillsboro sediments may be effective in attenuating trace metals and may contribute to apparent low levels of released …
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Sedimentology and diagenesis of Ediacaran phosphorites from South China
… of results from mineralogical and geochemical analyses and determinations of fossil affinities. Therefore, it is imperative to unravel the complications of post-depositional alteration, and thus provide a strong foundation for environmental and biological interpretations, via an integrated …
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Petrology and petrography of samples from two Algoa Basin cores
… drab fine to very fine silty sandstones and gray shales of a marine delta environment. Grain size analyses utilizing wet sieving and pippeting methods showed that two populations of grains are dominant, namely fine to very fine silty sand and clay size material. From the granulometric analyses …
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Structural constraints for the folding, stability and function of cytochrome C
… previously determined in this laboratory using X-ray diffraction analyses. In the first part of this study, the structures of wild-type yeast iso-2-cytochrome c and a composite mutant protein (B-2036) composed of segments derived from the genes of both isozymes were structurally characterized by …
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Contaminant migration of oil-and-gas drilling fluids within the glaciated sediments of north-central North Dakota
… samples were obtained with Shelby tubes for x-ray fluorescence and x-ray diffraction analyses. Additional chemical analyses were performed on saturated-paste extracts from the Shelby-tube samples. </p><p>The results of chemical analyses of pore water, groundwater, saturated-paste extracts, and …
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The Provenance of Eocene Tuff Beds in the Fossil Butte Member of the Green River Formation of Wyoming: Relation to the Absaroka and Challis Volcanic Fields
… zone originally as rhyolites and dacites. X-ray diffraction analyses reveal that the tuffs' glassy matrices have been altered to illite, calcite, clinoptilolite, analcime, albite, and K-feldspar. The variable alteration of the tuff beds confirms previous studies of Fossil Lake's salinity …
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Dirhodium(II,II) paddlewheel complexes conjugated to a polypyridyl tris-amine scaffold: synthesis and application as asdjncaslpre-catalysts in the hydroformylation of 1-octene
… N-CN system was confirmed by Single crystal X-ray diffraction analyses. The activity of the synthesized complexes and metallodendrimers were evaluated as catalyst precursors in the hydroformylation of 1-octene. Model reactions were carried out with dirhodium(II,II) tetraacetate as a precursor …
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Phase Relations in the YBa2Cu3O7-x - SiO2 System and the Impact on Superconducting Fibers
… presents the first reported identification and analyses of the phase relations in the YBa2Cu3O7-x (YBCO)-SiO2 system at elevated temperatures. In this regard, a rigorous characterization study of the reaction phases within YBCO glass fibers, heat-treated YBCO+SiO2 pellets, rapid thermally …
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Synthesis of Bridged and Unbridged Group (lV) Metallocene Complexes as Catalyst Precursors for Ethylene Polymerization
… complexes were established by single crystal X-ray diffraction analyses. In ethylene polymerization reactions, both complexes exhibited high activities. The zirconocene catalyst 34 showed a higher activity (7610 kg PE/mol cat. h) compared to the hafnium catalyst 35 (3590 kg PE/mol cat. h). A …
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Functionalized nido-C4B2, closo-C2B5 and -C2B10 Carboranes, and Reactivity Studies on Electron-Poor 2,3-Dihydro-1,3-diborolyl Complexes of Ruthenium
… and two independent but only partially solved X-ray diffraction analyses indicate that it has a stack of ruthenium atoms with bridging Cp* and 1,3-diborolyl ligands. The stacks are along a threefold axis which would be consistent with either extensive disorder or a tripling of the crystals. In …
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