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Showing 1 to 17 of 17 for “"X-ray methods"”.
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Structural studies of some copper(II) coordination compounds
… have been investigated by three-dimensional X-ray methods. The structure of one crystalline form of bis-(N-ethyl-salicylaldiminato) copper(II) has revealed that the copper atom in such a compound may adopt a tetrahedrally-distorted coordination geometry under less severe steric conditions than …
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ΣΥΝΘΕΣΗ, ΔΟΜΗ ΚΑΙ ΤΕΧΝΟΛΟΓΙΚΗ ΕΦΑΡΜΟΓΗ ΝΕΩΝ ΜΙΚΤΩΝ ΣΥΜΠΛΟΚΩΝ ΒΟΡΙΟΥ ΜΕ Β-ΔΙΚΕΤΟΝΕΣ ΚΑΙ ΟΡΓΑΝΙΚΑ ΔΙΚΑΡΒΟΝΙΚΑ ΟΞΕΑ Η ΥΔΡΟΞΕΑ
… WAS DEFINED WITH ANALYTICAL, SPECTROSCOPIC AND X-RAY METHODS. IT WAS CONFIRMED THAT THE BORON ATOM IS CONJUCTED TETRAEDRICALLY WITH ONE LIGAND OF SIX MEMBERED RING WHICH COMES FROM B-DIKETONE AND ONE LIGAND OFFIVE MEMBERED OR SIX MEMBERED RING WHICH COMES FROM THE CORRESPONDING ORGANIC ACID. …
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Pyrochemical changes in Missouri halloysite
… brick by baking formed clay bodies in the sun's rays, mankind has been speculating on the nature of the changes that convert soft, friable, plastic clays into hard, strong, non-plastic, rock-like masses. It has been only within the last two decades, however, that progress has been made in the …
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Chirale Sulfonimidamide und Sulfoximine : Synthese, Strukturuntersuchungen und Anwendungen
… thioureas were examined by NMR- and X-ray methods. Furthermore, the first example of an asymmetric metal catalysis using sulfonimidamides as ligands is presented: the cyclohexylamine derived sulfonimidamides were applied in the Cu-catalyzed asymmetric Henry reaction between aromatic …
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Investigation by neutron diffraction utilizing white neutron radiation
… The method used has several advantages over x-ray methods. Some of these are: samples of greater thicknesses can be investigated, a larger portion of the sample can be examined without oscillating the sample, and groups of samples can be investigated at the same time for a uniform preferred …
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Investigating mechanical properties of ordinary portland cement. Investigating improvements to the mechanical properties of Ordinary Portland Cement (OPC) bodies by utilizing the phase transformation properties of a ceramic (Zirconia).
… in ZrO2 were measured. Thermal analysis and x-ray methods were used to determine crystallite sizes and structures immediately following the exothermic burst. Comparisons were made for zirconias prepared from oxychloride, chloride and nitrate solutions. The existence of tetrameric …
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Establishing a physical and chemical framework for Amorphous Calcium Carbonate (ACC) biomineralization
Recent advances in high-resolution analytical methods have brought about a paradigm shift in our understanding of how crystalline materials are formed. The scientific community now recognizes that many earth materials form by multiple pathways that involve metastable intermediates. Biogenic calcium …
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Revisiting Allostery In Lac Repressor
… and dynamical information unobtainable by X-ray methods. However, due to LacI’s high molecular weight, low solubility, and transient stability, such studies have been limited to the non-allosteric, isolated DBD. Here, we present a solution-NMR study of the changes in structure and dynamics …
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Optically induced ferro- and antiferromagnetic dynamics in the rare-earth metal dysprosium
… source for ultra-short elliptically polarized x-ray pulses. Laser-induced changes of the 4f-magnetic order parameter in ferro- and antiferromagnetic dysprosium (Dy), were studied by x-ray methods, which yield directly comparable quantities. The discovered fundamental differences in the temporal …
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Dynafold: A Dynamic Programming Approach to Protein Structure Calculation From Residual Dipolar Couplings
… of one or more proteins. As a result, methods for determining the three dimensional structure of proteins are of tremendous interest to researchers in a variety of fields. Presently, methods of protein structure determination are dominated by X-ray crystallography and nuclear magnetic …
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Aspects of organometallic chromium nitrosyl chemistry
… sphere of the metal as determined by ESR and X-ray crystallography of the CpCr(N0)(PPh3)CH2SiMe3complex. This complex possesses the ability to lose ligands selectively to attain an 18-valence electron configuration. For example, reaction of CpCr(N0)(PPh3)CH2SiMe3 with NO and [INTO]+ results in …
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Charakterisierung von funktionellen Metalloxidgrenzflächen mittels Röntgenmethoden und Elektronenmikroskopie
Grenzflächen von Übergangsmetalloxiden in Halbleiterbauelementen bestimmen die Funktionalität auf vielfältige Art und Weise. In dieser Arbeit werden die Nb2O5|Metall- (Metall = Al, Ti, Pt), die TiN|TiO2- und die Si|SrTiO3-Grenzfläche mittels röntgenographischer Methoden sowie der …
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Isothermal Titration Calorimetry Studies Of Protein-Mediated Interactions And Preliminary Structural Studies Of Tandem Pdz1-2 Domain Of Psd-95 Protein
… of PDZ domain binding using calorimetry; (2) X-ray crystallographic structural studies of a PDZ dual domain; and (3) thermodynamic analysis of frataxin binding to iron. The specific goal of the research conducted with the PDZ domains was to understand the mechanism of action of multiple/tandem …
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Synthesis and characterization of N-alkylthiourea and N, N -dialkylthiourea complexes of Cu, Cd and Pb, and their use as single source precursors for the synthesis of metal sulfide nanoparticles
… elemental analysis, melting points and X-ray crystallography. Infrared and NMR spectroscopy studies reveal the interaction between a metal and the ligands, thioureas, is mainly through bonding to sulfur. A series of cadmium(II) complexes with N-alkyl/aryl and N, N'-dialkyl/aryl thioureas …
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The behaviour of sand at low stress levels in the simple-shear apparatus
… samples tested in the new apparatus, and using X-ray methods, the local strains within those samples, it is demonstrated that conditions have been vastly improved and that the behaviour is now remarkably uniform up to the point of failure. Thus for the first time it has been possible to obtain a …
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Νέα υλικά ανόδου κελιών καυσίμου στερεού ηλεκτρολύτη (sofc) - παρασκευή, χαρακτηρισμός και έλεγχος ιδιοτήτων
Στα πλαίσια της αναζήτησης νέων μεθόδων παραγωγής ενέργειας υψηλής απόδοσης και φιλικής προς το περιβάλλον, ένα μεγάλο μέρος των ερευνητικών δραστηριοτήτων σε διεθνή κλίμακα έχει στραφεί στην ανάπτυξη της τεχνολογίας των κελιών καυσίμου στερεού ηλεκτρολύτη, SOFCs (Solid Oxide Fuel Cells). Ένα από …
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New Developments in the Crystal Chemistry of Selected Borophosphates and Phosphates
… shoud be investigated by thermoanalytical and X–ray methods. The extensive studies on borophosphate containing the transition metals Fe, Co, Ni together with alkaline earth–metals (Mg, Ca, Sr, Ba) led to the preparation of 13 compounds containing the combination of two different divalent M1IIM2II …