Results 51 to 60 of about 3,218,520 (221)

Quantum mechanical study of the influence of noble metals on the process of reduction of uranium oxides

Nuclear Engineering and Technology
A DFT study of electrochemical reductions of uranium oxides in the presence of noble metals was performed. The study focused on the effects produced by the presence of Ag, Au, Pt and Pd on the rate of UOx reduction and on the composition of the resulting
A.S. Vorob'ev, A.Y. Galashev, Yu P. Zaikov   +2 more
doaj   +1 more source

Production of uranium tetrafluoride from the effluent generated in the reconversion via ammonium uranyl carbonate

Nuclear Engineering and Technology, 2017
Uranium tetrafluoride (UF4) is the most used nuclear material for producing metallic uranium by reduction with Ca or Mg. Metallic uranium is a raw material for the manufacture of uranium silicide, U3Si2, which is the most suitable uranium compound for ...
João Batista Silva Neto, Elita Fontenele Urano de Carvalho, Rafael Henrique Lazzari Garcia, Adonis Marcelo Saliba-Silva, Humberto Gracher Riella, Michelangelo Durazzo   +5 more
doaj   +1 more source

Synthesis and crystal structure of triethylammonium hexabromidouranate(IV) dichloromethane monosolvate

Acta Crystallographica Section E: Crystallographic Communications, 2020
Triethylammonium hexabromidouranate(IV) dichloromethane monosolvate, [(C2H5)3NH]2[UBr6]·CH2Cl2, was obtained in the form of dark-brown crystals from the reaction of uranium pentabromide with NEt3 and ethylene glycol in dichloromethane at low temperature.
Holger Lars Deubner, Marcel Koester, Carsten von Haenisch, Florian Kraus   +3 more
doaj   +1 more source

Spatial distribution of an uranium-respiring betaproteobacterium at the Rifle, CO field research site. [PDF]

PLoS ONE, 2015
The Department of Energy's Integrated Field-Scale Subsurface Research Challenge Site (IFRC) at Rifle, Colorado was created to address the gaps in knowledge on the mechanisms and rates of U(VI) bioreduction in alluvial sediments.
Nicole M Koribanics, Steven J Tuorto, Nora Lopez-Chiaffarelli, Lora R McGuinness, Max M Häggblom, Kenneth H Williams, Philip E Long, Lee J Kerkhof   +7 more
doaj   +1 more source

C‐Terminal Functionalization Methods of Amino Acids, Peptides, and Proteins

Chemistry – A European Journal, EarlyView.
C‐terminal functionalization offers powerful routes to peptide and protein diversification, yet epimerization, hydrolysis, and selectivity remain key challenges. This Review surveys enzymatic, decarboxylative, and condensation strategies, highlighting advances toward chemo‐ and regioselective, protecting‐group‐free, atom‐efficient methods applicable to
Jay Hanssens, Mark Lambers, Romano V. A. Orru, Jordy M. Saya   +3 more
wiley   +1 more source

REDUKSI AKTIVITAS URANIUM DALAM LIMBAH RADIOAKTIF CAIR MENGGUNAKAN PROSES ELEKTROKOAGULASI

Urania, 2017
ABSTRAK REDUKSI AKTIVITAS URANIUM DALAM LIMBAH RADIOAKTIF CAIR MENGGUNAKAN PROSES ELEKTROKOAGULASI. Limbah yang dihasilkan dari proses pengembangan bahan industri bersifat radioaktif yang mengandung uranium yang dapat menimbulkan dampak negatif pada ...
Prayitno Prayitno, Vemi Ridantami, Imam Prayogo   +2 more
doaj   +1 more source

Evaluation of alternative reductants for stimulating uranium reduction and immobilization

, 2021
In this study, sodium dithionite (DI) and calcium polysulfide (CPS) were added to microcosms and continuous-flow columns, using groundwater and sediments from a mining site to stimulate uranium immobilization.
Osia, Nebechi Obiajulu
core  

X‐Ray Absorption Sensitivity at 5d$5d$ Edges of High‐Valent Light Actinides to Crystal‐Field Strength and Covalency Effects

Chemistry – A European Journal, EarlyView.
Analysis of x‐ray absorption spectra of U(VI) and U(V) oxides indicates an important role of U 5f−O$5f-\rm{O}$ 2p$2p$ charge transfer for increasing the 5f$5f$ occupancy and thereby affecting the ground state properties. ABSTRACT The 5f$5f$ states were probed in ThO2$\rm{ThO}_2$ and U(VI) and U(V) oxides using x‐ray absorption spectroscopy at the ...
Johan R. Vegelius, David K. Shuh, Sergei M. Butorin   +2 more
wiley   +1 more source

S-Scheme Heterojunction D-ZnO@FexOy Derived From ZIF-8 Organic Framework for Photoassisted Reduction of U(Ⅵ)

He huaxue yu fangshe huaxue
With the rapid development of nuclear energy, uranium as the main element of nuclear energy production, its source has been widely explored. At present, uranium resources mainly come from uranium mining, and a lot of radioactive uranium containing ...
Yu-zhi XIE, Peng WANG, Huan-huan DONG, Rui-xiang WANG, Fu-cheng ZHANG, Hang-xin YU, Yi-ding ZHAO, Yong-xiang ZHANG, Wen-kun ZHU, Tao CHEN   +9 more
doaj   +1 more source

A rock brittleness index based on the postpeak energy release rate and damage surface characteristics for brittle hard rock

Deep Underground Science and Engineering, EarlyView.
This study examines energy evolution in rock rupture via triaxial direct shear tests, exploring the impact of confining pressure and temperature on fracture surface randomness. A novel energy‐based brittleness index is proposed, validated experimentally, and compared with existing methods for reliability and accuracy.
Biao Wang, Zaobao Liu, Jing Xue, Bo Lu, Wei Zeng, Dengke Zhang   +5 more
wiley   +1 more source