Uranium
Mostrando 1-12 de 184 artigos, teses e dissertações.
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1. Il cambiamento radicale delle politiche migratorie: dal lasciar vivere al lasciare morire (dalla biopolitica a sempre più tanatopolitica)
Abstract The text describes the salient aspects of the current world situation. Through a synthetic analysis of the process that led to the triumph of globalized liberalism, it is shown how starting in 1990 the war on migration is inscribed in a real thanatopolitics (letting die). In fact, the dominant people designate migration as the enemy of the 21st cent
REMHU, Rev. Interdiscip. Mobil. Hum.. Publicado em: 2021-04
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2. Projetos e imobilidade(s): sorveteiros ítalo-brasileiros diante da Covid-19
Abstract The text describes the salient aspects of the current world situation. Through a synthetic analysis of the process that led to the triumph of globalized liberalism, it is shown how starting in 1990 the war on migration is inscribed in a real thanatopolitics (letting die). In fact, the dominant people designate migration as the enemy of the 21st cent
REMHU, Rev. Interdiscip. Mobil. Hum.. Publicado em: 2021-04
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3. Mobilidades, imobilidades e mobilizações em tempos de COVID-19
Abstract The text describes the salient aspects of the current world situation. Through a synthetic analysis of the process that led to the triumph of globalized liberalism, it is shown how starting in 1990 the war on migration is inscribed in a real thanatopolitics (letting die). In fact, the dominant people designate migration as the enemy of the 21st cent
REMHU, Rev. Interdiscip. Mobil. Hum.. Publicado em: 2021-04
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4. Application of the fundamental parameter method to the assessment of major and trace elements in soil and sediments from Osamu Utsumi uranium mine by WDXRF
Abstract Wavelength dispersive X-ray fluorescence spectrometry (WDXRF) is a suitable technique for the characterization of contaminated mining sites, providing a quick and reliable screening for areas of significant contamination. This study established and validated a non-destructive methodology for quantitative simultaneous determination of major and minor
REM, Int. Eng. J.. Publicado em: 16/09/2019
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5. Geochronological systematics of the Huayna Potosí, Zongo and Taquesi plutons, Cordillera Real of Bolivia, by the K/Ar, Rb/Sr and U/Pb methods
Abstract The Huayna Potosi, Zongo and Taquesi are Triassic plutons located at the core of the Real Cordillera of Bolivia. In this paper, several Rb-Sr and K-Ar ages obtained in the past at the São Paulo Geochronology Laboratory, yet unpublished, will be presented, along with newer U-Pb Sensitive High-Resolution Ion Microprobe (SHRIMP) determinations made in
Braz. J. Geol.. Publicado em: 01/07/2019
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6. High Uranium Concentrations in the Groundwater of the Rio de Janeiro State, Brazil, Mountainous Region
Unexpectedly high uranium concentrations, up to 930 µg L-1, approximately thirty times higher than the World Health Organization (WHO) guidance level, were observed in groundwater samples from the mountainous region near Rio de Janeiro City, the so-called “Região Serrana”, approximately 60 km from the city. This region is characterized by a large numbe
J. Braz. Chem. Soc.. Publicado em: 2019-02
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7. Precipitación de uranio a partir de licores alcalinos
ABSTRACT In Argentina there is uranium with abundant organic matter and variety in quantity of sulfides and carbonates which act as cement or sealing joints. The latter minerals modify directly the choice of metal leaching process for the concentration of uranium. The most beneficial selected process turns out to be the alkaline leaching. Once this process h
Matéria (Rio J.). Publicado em: 19/07/2018
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8. Fases identificables en la zona de interacción de placas combustibles dispersas U3Si2/Al
ABSTRACT Fuel elements based on U3Si2 particles dispersed in a pure Al matrix (known as dispersion fuel element) are known to be very stable under irradiation, in plate type configurations. For this reason, they were or are being used to convert to low enriched uranium a large number of research reactors without significant loss in performance. According to
Matéria (Rio J.). Publicado em: 19/07/2018
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9. Vasoactive Thiomethyl-Pyrimidines: Promising Drug Candidates with Vascular Activity
Pyrimidines and their derivatives are present in various biologically active molecules. Most of the synthetic methods employed to achieve the pyrimidinone ring consist of two stages: the synthesis of a Michael intermediate from an aldehyde and an "active methylene" containing compound; and the condensation of this intermediate with a molecule containing an u
J. Braz. Chem. Soc.. Publicado em: 2017-07
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10. Determination of U3O8 in UO2 by infrared spectroscopy
Abstract The oxygen-uranium (O-U) system has various oxides, such as UO2, U4O9, U3O8, and UO3. Uranium dioxide is the most important one because it is used as nuclear fuel in nuclear power plants. UO2 can have a wide stoichiometric variation due to excess or deficiency of oxygen in its crystal lattice, which can cause significant modifications of its proprie
REM, Int. Eng. J.. Publicado em: 2017-03
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11. MODELING OF THE SOLVENT EXTRACTION EQUILIBRIUM OF URANIUM (VI) SULFATE WITH ALAMINE 336
Abstract The present study investigated the solvent extraction of uranium from sulfate acid solutions using Alamine 336 as an extractant dissolved in commercial kerosene Exxsol D-100 and 5% v/v of tridecanol as a modifying agent at room temperature (25±2) ºC and an aqueous/organic volumetric ratio of unity. Experiments were carried out at typical concentra
Braz. J. Chem. Eng.. Publicado em: 2017-01
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12. On-line Green Solid Phase Extraction of Trace Rare Earth Elements and Uranium in Environmental Samples and ICP OES Detection
An on-line solid phase extraction (SPE) method using mini column packed with natural sorbent based on cotton roll dyed by quinalizarin was developed for simultaneously pre-concentration of rare earth elements and uranium at trace levels in environmental samples followed by inductively coupled plasma optical emission spectrometry (ICP OES) determination. Vari
J. Braz. Chem. Soc.. Publicado em: 2016-10