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54 results for “Uranium”
Uranium mobility and accumulation along the Rio Paguate, Jackpile Mine in Laguna Pueblo, NM
The mobility and accumulation of uranium (U) along the Rio Paguate, adjacent to the Jackpile Mine, in Laguna Pueblo, New Mexico was investigated using aqueous chemistry, electron microprobe, X-ray diffraction and spectroscopy analyses. Given that it is not common to identify elevated concentrations of U in surface water sources, the Rio Paguate is a unique site that concerns the Laguna Pueblo community. This study aims to better understand the solid chemistry of abandoned mine waste sediments from the Jackpile Mine and identify key hydrogeological and geochemical processes that affect the fate of U along the Rio Paguate. Solid analyses using X-ray fluorescence determined that sediments located in the Jackpile Mine contain ranges of 320 to 9200 mg kg-1 U. The presence of coffinite, a U(IV)-bearing mineral, was identified by X-ray diffraction analyses in abandoned mine waste solids exposed to several decades of weathering and oxidation. The dissolution of these U-bearing minerals from abandoned mine wastes could contribute to U mobility during rain events. The U concentration in surface waters sampled closest to mine wastes are highest during the southwestern monsoon season. Samples collected from September 2014 to August 2016 showed higher U concentrations in surface water adjacent to the Jackpile Mine (35.3 to 772 mg L-1) compared with those at a wetland 4.5 kilometers downstream of the mine (5.77 to 110 mg L-1). Sediments co-located in the stream bed and bank along the reach between the mine and wetland had low U concentrations (range 1–5 mg kg-1) compared to concentrations in wetland sediments with higher organic matter (14–15%) and U concentrations (2–21 mg kg-1). Approximately 10% of the total U in wetland sediments was amenable to complexation with 1 mM sodium bicarbonate in batch experiments; a decrease of U concentration in solution was observed over time in these experiments likely due to re-association with sediments in the reactor. The findings from this study pro
Characterisation data of Nd- and Ce-doped uranium dioxide microspheres prepared via internal gelation
<p>The preparation of Nd- and Ce-doped UO<sub>2</sub> microspheres was studied, applying the sol-gel method via internal gelation (IG). Un-doped, and <em>Ln</em>-doped ammonium diuranate (ADU) gels with <em>Ln</em> molar metal fractions up to 30 mol% and an increment of 5 mol% were prepared (<em>Ln</em> = Nd, Ce). The dried gels were characterised using optical microscopy (OM) and X-ray powder diffraction (XRD), additionally thermogravimetric differential scanning calorimetry (TG-DSC) measurements were carried out on un-doped microspheres and particles containing 10 mol% dopant. The ADU matrix of the dried particles is converted during a thermal treatment via U<sub>3</sub>O<sub>8</sub> into a UO<sub>2</sub> matrix, which was carried out by a calcination in air (900 °C, 1 h) and a sintering in a mixture of Ar:H<sub>2</sub> and Ar:O<sub>2</sub>, corresponding to an oxygen potential of about −420 kJ mol<sup>−1</sup> , at 1600 °C for 10 h. Calcined intermediates of the un-doped particle batch, and particles each doped with 10 mol% Nd and Ce, were analysed by XRD. Sintered products of all compositions were also characterised by XRD, and additionally via scanning electron microscopy (SEM). The micropraphs, XRD patterns, TG-DSC results and all data associated with the particle fabrication and characterisation, are part of this dataset.</p>
Thermal decomposition data of uranium containing microspheres produced via internal gelation and ammonium diuranate powder
<p>A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the thermal decomposition behaviour in the NH<sub>3</sub> − UO<sub>3</sub> − H<sub>2</sub>O class of materials.</p> <p>One compound was prepared according to a typical ammonium diuranate precipitation reaction, and could be identified as 3UO<sub>3</sub>·NH<sub>3</sub>·5H<sub>2</sub>O. Microspheres prepared by the sol-gel method via internal gelation were associated to the composition 3UO<sub>3</sub>·2NH<sub>3</sub>·4H<sub>2</sub>O under the specified conditions.</p> <p>The products were analysed using the techniques listed below, the resulting data are part of this dataset.</p> <ul> <li>TGA, combined with EGA-MS (<em>T<sub>max</sub></em> = 1300 °C, heating rate = 2 °C/min)</li> <li>TG-DSC, combined with EGA-MS (<em>T<sub>max</sub></em> = 1300 °C, heating rate = 10 °C/min)</li> <li>ambient XRD (dried products after synthesis)</li> <li><em>in-situ</em> high temperature XRD (including initial and final scans, taken at 35 °C) <ul> <li><em>T<sub>max</sub></em> for 3UO<sub>3</sub>·NH<sub>3</sub>·5H<sub>2</sub>O = 1300 °C; <em>T<sub>max</sub></em> for 3UO<sub>3</sub>·2NH<sub>3</sub>·4H<sub>2</sub>O = 650 °C</li> <li>Samples measured directly on a Pt/Rh heating strip (Pt/Rh phase visible in patterns, blank scan included)</li> </ul> </li> </ul>
Data for: "A Route to Stabilize Uranium(II) and Uranium(I) Synthons in Multimetallic Complexes"
<p>Low valent uranium can be stabilized via an unprecedented mechanism involving intramolecular ligand migration:the two-and three-electron reduction of the oxo-bridgedU(IV)/U(IV)complex,[{(Ph3SiO)3(DME)U}2(O)], yields formal “U(II)”/U(IV) and “U(I)”/U(IV) complexes,via ligand migration and formation of uranium-arene δ-bond interactions,that can transfer up to threeelectrons tosubstrates by restoring the original ligand arrangement.</p>
Female mouse 60d water uranium exposure
Female mice were exposed to uranium in the drinking water for 60 days. Doses of uranium (in the form of uranyl acetate) were 0, 5, and 50 ppb. We examined 1) immune function of splenocytes (mitogenesis) 2) lymphocyte population subsets in the bone marrow, spleen and thymus (flow cytometry) 3) erythroid cell differentiation in the bone marrow (flow cytometry) 4) uranium concentrations in kidney, femur bone, liver, blood spleen thymus and bone marrow (ICP-MS).
Data for: "Iron promoted end-on dinitrogen-bridging in heterobimetallic complexes of uranium and lanthanides"
<p>RAW DATA FOR ARTICLE DATE: APRIL 2024 TITLE: Iron promoted end-on dinitrogen-bridging in heterobimetallic complexes of uranium and lanthanides AUTHORS: Nadir Jori, Juan J Moreno, K A Keerthi Shivaraam, Thalayan Rajeshkumar, Rosario Scopelliti, Laurent Maron, Jesus Campos and Marinella Mazzanti JOURNAL: Chemical Science 2024</p>
Observed and Predicted Bulk Sediment Uranium Isotope Composition (δ234U) for ODP 1094 Over the Last 500 kyr
<p>This is supplementary data associated with a manuscript entitled "Anomalous 234U/238U Isotopic Composition in Southern Ocean Sediments" by N. Redmond, C. T. Hayes, S. K. Glasscock, E. Rohde, R. F. Anderson, and D. McGee</p> <p><br> Variables<br> Sample ID - Section of ODP 1094 core. Hole-Core-Section-Depth(cms)<br> MCD_TOP - Meters Composite Depth at the top of the section<br> Age (Hasenfratz et al., 19) - in kyrs, based on tuning of benthic δ18O to LR04 stack<br> U-238 - Concentration of 238U in bulk sediment, units in ppm or micrograms/gram.<br> aU - Authigenic uranium concentration, calculated from removing th-based detrital U fraction from bulk 238U, units in ppm or micrograms/gram<br> δ234U Observed - Uranium isotope composition observed in bulk sediment, written as the per mil deviation from secular equilibrium, units in ppm or micrograms/gram<br> δ234U Observed Error - Uncertainty Uranium isotope composition observed in bulk sediment, written as the per mil deviation from secular equilibrium, units in ppm or micrograms/gram<br> δ234U Modeled - Uranium isotope composition predicted in bulk sediment by a mixing model of authigenic and detrital U, decayed with age to match observed data, written as the per mil deviation from secular equilibrium, units in ppm or micrograms/gram<br> δ234U Modeled Error - Uncertainty of Uranium isotope composition predicted in bulk sediment by a mixing model of authigenic and detrital U, decayed with age to match observed data, written as the per mil deviation from secular equilibrium, units in ppm or micrograms/gram</p> <p> </p>
Dataset: Sprott Junior Uranium Miners ETF (URNJ) Stock Performance
This dataset provides historical stock market performance data for specific companies. It enables users to analyze and understand the past trends and fluctuations in stock prices over time. This information can be utilized for various purposes such as investment analysis, financial research, and market trend forecasting.
Dataset: Uranium Royalty Corp. (UROY) Stock Performance
This dataset provides historical stock market performance data for specific companies. It enables users to analyze and understand the past trends and fluctuations in stock prices over time. This information can be utilized for various purposes such as investment analysis, financial research, and market trend forecasting.
Uranium series data of phreatic overgrowth on speleothems and stalactites from Genovesa and Drac caves.
Open the record for dataset details and reuse information.
Uranium-series disequilibria in MORB, revisited: A systematic numerical approach to partial melting of a heterogeneous mantle
<p><span>This directory includes all of the gridded run results for each melting scenario for this paper, organized into approx. 50 supplementary figures with a series of activity ratio diagrams.</span></p>
Telescopus finkeldeyi Haacke, 2013 DAMARA TIGER SNAKE Telescopus finkeldeyi Haacke 2013:281. Holotype: TM 53542 (collector J.A. van Rooyen). Type locality: "Rössing Uranium mine area, Swako- mund [sic] district (2214Db) Namibia." Global conservation status (IUCN): Not Evaluated. Global distribution: The species is known from Angola and Namibia. Ocurrences in Angola (Map 364): The species occurs in southwestern Angola. Namibe: "5 km north Namibé" [-15.20000, 12.15000] (Haacke 2013:285). Taxonomic and distributional notes: Some earlier records of T. semiannulatus polystictus in Namibia actually refer to this recently described species. MAP 364. Distribution of Telescopus finkeldeyi in Angola. in Diversity and Distribution of the Amphibians and Terrestrial Reptiles of Angola Atlas of Historical and Bibliographic Records (1840-2017)
Telescopus finkeldeyi Haacke, 2013 DAMARA TIGER SNAKE Telescopus finkeldeyi Haacke 2013:281. Holotype: TM 53542 (collector J.A. van Rooyen). Type locality: "Rössing Uranium mine area, Swako- mund [sic] district (2214Db) Namibia." Global conservation status (IUCN): Not Evaluated. Global distribution: The species is known from Angola and Namibia. Ocurrences in Angola (Map 364): The species occurs in southwestern Angola. Namibe: "5 km north Namibé" [-15.20000, 12.15000] (Haacke 2013:285). Taxonomic and distributional notes: Some earlier records of T. semiannulatus polystictus in Namibia actually refer to this recently described species. MAP 364. Distribution of Telescopus finkeldeyi in Angola.
Data for: "Simulation of uranium plasma plume dynamics in atmospheric oxygen produced via femtosecond laser ablation"
<p>Data generated by 2D reactive, compressible, multi-species fluid model of uranium femtosecond laser ablation in an atmospheric oxygen environment. The dataset consists of a series of plain text tabular data files recorded at several time points during the simulation run. The data files are numbered according to the simulation time in nanoseconds (FFF-0100.txt is the data at 100 ns) and are given at intervals of 50 ns for the first 500 ns of simulation time, and every 100 ns thereafter, up to the total simulation time of 10000 ns. The initial conditions are provided in the first data file (FFF-0000.txt). Each data file contains spatially-resolved values of the fluid moments along with the molar concentrations of each species considered in the model (total of 30 species), given in a column format delimited by spaces.</p> <p>For details on the model implementation and simulation conditions, please refer to the associated manuscript.</p>
Collinear laser spectroscopy data of singly charged natural uranium isotopes
<div> <div>This dataset contain the raw data produced in an offline experiment at the IGISOL facility, University of Jyväskylä</div> <div>Accelerator laboratory JYFL, using the Collinear Laser Spectroscopy (CLS) line to measure a set of ten ionic transitions in 234,235,238U.</div> </div>
Nitride protonation and NH3 binding versus N–H bond cleavage in uranium nitrides
<p>The conversion of metal nitrides to NH3 is an essential step in dinitrogen fixation, but there is limited knowledge of the reactivity of nitrides with protons (H+). Herein, we report comparative studies for the reactions of H+ and NH3 with uranium nitrides, containing different types of ancillary ligands. We show that the differences in ancillary ligands, leads to dramatically different reactivity. The nitride group, in nitride-bridged cationic and anionic diuranium(IV) complexes supported by –N(SiMe3)2 ligands, is resistant toward protonation by weak acids, while stronger acids result in ligand loss by protonolysis. Moreover, the basic –N(SiMe3)2 ligands promote the N–H heterolytic bond cleavage of NH3, yielding a “naked” diuranium complex containing three bridging ligands, a nitride (N3) and two NH2 ligands. Conversely, in the nitride-bridged diuranium(IV) complex supported by –OSi(OtBu)3 ligands, the nitride group is easily protonated to afford NH3, which binds the U(IV) ion strongly, resulting in a mononuclear U–NH3 complex, where NH3 can be displaced by addition of strong acids. Furthermore, the U– OSi(OtBu)3 bonds were found to be stable, even in the presence of stronger acids, such as NH4BPh4, therefore indicating that –OSi(OtBu)3 supporting ligands are well suited to be used when acidic conditions are required, such as in the H+/e mediated catalytic conversion of N2 to NH3.</p>
Data for: "A Route to Stabilize Uranium(II) and Uranium(I) Synthons in Multimetallic Complexes"
<p>Lowvalent uranium can be stabilized via an unprecedented mechanism involving intramolecular ligand migration:the two-and three-electron reduction of the oxo-bridgedU(IV)/U(IV)complex,[{(Ph3SiO)3(DME)U}2(O)], yields formal “U(II)”/U(IV) and “U(I)”/U(IV) complexes,via ligand migration and formation of uranium-arene δ-bond interactions,that can transfer up to threeelectrons tosubstrates by restoring the original ligand arrangement.</p>
Male mouse 60d water uranium exposure
Male mice were exposed to uranium in the drinking water for 60 days. Doses of uranium (in the form of uranyl acetate) were 0, 5, and 50 ppb. We examined 1) immune function of splenocytes (mitogenesis) 2) lymphocyte population subsets in the bone marrow, spleen and thymus (flow cytometry) 3) erythroid cell differentiation in the bone marrow (flow cytometry) 4) uranium concentrations in kidney, femur bone, liver, blood spleen thymus and bone marrow (ICP-MS).
Real time, in-situ deuteriding of uranium encapsulated in grout; effects of temperature on the uranium-deuterium reaction
<p>To accurately predict the initiation and evolution of uranium hydride potentially present in nuclear waste containers, studies of simulated conditions are required. Here, for the first time, the uranium-deuterium reaction was examined in-situ, in real time, whilst within grouted media. A deuterium gas control rig and stainless steel-quartz glass reaction cell were configured on a synchrotron beam line to collect X-ray diffraction and X-ray tomography data. It was found that deuteride formation, and thus hydride formation, was limited by the uranium and grout thermal conductivities and deuteride initiation only commenced above a threshold temperature. Strong adherence between uranium oxide and grout was also observed.</p>
Data for: "Dinitrogen Cleavage by a Dinuclear Uranium(III) Complex"
<p>RAW DATA FOR ARTICLE DATE: OCTOBER 2023 TITLE: Dinitrogen Cleavage by a Dinuclear Uranium(III) Complex AUTHORS: Nadir Jori, Megan R. Keener, Thayalan Rajeshkumar, Rosario Scopelliti, Laurent Maron, and Marinella Mazzanti JOURNAL: Chemical Science 2023</p>
dataset for Machine Learning Surrogates for Surface Complexation Model of Uranium Sorption to Oxides
<p>The data sets are used to train, validate, and test SCM surrogates for uranium sorption on oxide surfaces. </p> <p>train_norm.csv, val_norm.csv, and test_norm.csv are used to train, validate, and evaluate DNN-SCM surrogate. </p> <p>test_set1.csv and test_set2.csv are two additional datasets to evaluate the model's performance. </p>
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