Articles de revues : « Uranian literature »

1

Miller, James E. « T. S. Eliot's “Uranian Muse” : The Verdenal Letters ». ANQ : A Quarterly Journal of Short Articles, Notes and Reviews 11, n^o 4 (janvier 1998) : 4–20. http://dx.doi.org/10.1080/08957699809601265.

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Boetzkes, Amanda, et Jeff Diamanti. « Geofetishism and the Tender Violence of Rare Earths ». SubStance 52, n^o 3 (2023) : 9–30. http://dx.doi.org/10.1353/sub.2023.a913888.

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Abstract: This article addresses the geospeculation of Kuannersuit, a mountain in southwest Greenland that holds a major deposit of rare earth minerals, including uranium. Through the concepts of “geofetishism” and “tender violence,” we consider the history of mineral speculation in Greenland, and how its colonial history bears on the now independent (Inuit) Greenlandic government, and the township of Narsaq. With a focus on the anti-uranium activist group, Urani? Naamik! , we show the challenges posed to Greenlanders in their resistance to the mobilization of their mineral resources by the Australian mining company, Greenland Minerals and Energy (now renamed Energy Transition Minerals). A highlight of this resistance, in our view, is Urani Naamik’s counter-analysis of GME’s environmental assessment report.

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Mussayeva, E. M., et M. M. Bakhtin. « Уран кенін өндіретін аймақтарда “топырақ-өсімдік” тізбегіндегі радионуклидтердің миграциясына баға беру (әдеби шолу) ». BULLETIN of the L.N. Gumilyov Eurasian National University. BIOSCIENCE Series 142, n^o 1 (2023) : 124–35. http://dx.doi.org/10.32523/2616-7034-2023-142-1-124-135.

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It is well known that as a result of the activities of the mining industry, radionuclides and chemicals with active mutagenic and carcinogenic effects can be extracted to the surface. Disposal products, such as radioactive waste and others, may cause particular danger. In this regard, this requires regular monitoring of radioactive waste storage sites and the degree of migration of radionuclides and heavy metals in environmental objects. This review article considers the uranium ore region’s current data for the content of radionuclides in soil, vegetation, and their migration in the “soil-plant” chain.

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Zhu, Min, Hanyuan Mao, Yanjun Wang, Ming Guo, Biao Li, Fei Wu, Jie Tian et Desheng Ma. « Study on the Equivalence of Metallic-Cerium-Simulated Uranium-Aerosol Generation under Fire ». Processes 11, n^o 2 (30 janvier 2023) : 419. http://dx.doi.org/10.3390/pr11020419.

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Uranium aerosols are released from uranium-containing materials in high-temperature environments caused by nuclear accidents or other processes. Research on the generation characteristics of uranium aerosols under such conditions is an important part of nuclear-safety analysis. In this experiment, the similarity between metal cerium aerosols and uranium material aerosols was evaluated from the aspects of particle size distribution and source term. Combined with the experiment data, the effect of air flow rate and sampling time is discussed. The calculation result of the air release fraction (ARF) is 6.07 × 10−3–4.8 × 10−2, and the respirable fraction (RF) is 0.810–0.978, respectively, showing that the size distribution of particles and ARF of the cerium aerosol are different from the results of the uranium aerosols in the literature, while the RF is similar to the results obtained by using the uranium–niobium alloy in the literature.

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Bolton, H. Carrington. « XXVIII.-Index to the Literature of Uranium ». Annals of The Lyceum of Natural History of New York 9, n^o 1 (22 mai 2009) : 362–76. http://dx.doi.org/10.1111/j.1749-6632.1870.tb00202.x.

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Marks de Marques, Eduardo, et Raíssa Cardoso Amaral. « O percurso doloroso entre a prática e a teoria : reflexões sobre a personagem urania em “A festa do bode”, de Mario Vargas Llosa ». Anuário de Literatura 21, n^o 1 (30 juin 2016) : 32. http://dx.doi.org/10.5007/2175-7917.2016v21n1p32.

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http://dx.doi.org/10.5007/2175-7917.2016v21n1p32Este artigo irá apresentar reflexões sobre a personagem Urania do romance A Festa do Bode, publicado originalmente em 2000, pelo escritor peruano Mario Vargas Llosa. Para esta análise, utilizou-se o conceito de metaficção historiográfica, cunhado por Linda Hutcheon ([1998] 1991) para abordar a relação entre literatura e história no romance. No que concerne à análise da personagem Urania (foco primordial do artigo) será demonstrado o entrelaçamento de memória e trauma no eixo narrativo de Urania, já que a personagem passou por uma experiência traumática em um período limite da República Dominicana: a ditadura da Era Trujillo (1930-1961). No percurso entre a teoria e prática, isto é, a vivência histórica e o conhecimento histórico, eis que surge Urania e o poder de recriar ficcionalmente as consequências que a ditaduras podem deixar nos indivíduos. Além disso, é justamente no movimento entre teoria e prática que a reconstrução da identidade dominicana de Urania torna-se possível.

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Diac, Madalina, Anton Knieling, Simona Irina Damian, Diana Bulgaru Iliescu, Ion Sandu, Cristina Furnica, Catalin Jan Iov et Sofia David. « Forensic Aspects in Polonium-210 Poisoning ». Revista de Chimie 68, n^o 11 (15 décembre 2017) : 2646–49. http://dx.doi.org/10.37358/rc.17.11.5946.

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The human body is exposed to radiation resulting from the presence and degradation in the environment of natural radionuclides like uranium and thorium. In laboratories, several radioactive isotopes are being used: uranium-235, iodine-131, cobalt-60, and carbon-14. These radioactive isotopes are useful in scientific (dating human skeletal remains) and medical purposes (radiotherapy/radiodiagnosis), but they are also used in criminal context. Polonium 210 (Po-210) is a natural radioisotope occurring in the natural environment as consequence of uraniu-238 decay chain. The current paper presents a less known subject of lethal poisoning with Po-210 radioisotope, in order to underline the methods used for Po-210 identification in forensic samples. The authors performed a literature review of the scientific researchers published in the last years concerning polonium sources and its use as a poison. Polonium�s effectiveness as a poison relies on its chemical characteristics only to the extent that they determine the isotope�s distribution and retention in organs and tissues; the alpha particles are responsible for the lethal effect. Po-210 poisoning is particular, as it doesn�t leave traces, it can be easily transported, and is not detected by airport scanners. Identifying this compound during a medico-legal autopsy is very difficult, as the post-mortem examination will not yield characteristic aspects, the forensic pathologist being forced to consider this as a potential cause of a rapid death, with significant visceral damage.

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Bryce, Judith, Giulia Bigolina et Valeria Finucci. « Urania ». Modern Language Review 99, n^o 3 (juillet 2004) : 801. http://dx.doi.org/10.2307/3739064.

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Fisenne, I. M., P. M. Perry et N. H. Harley. « Uranium in Humans ». Radiation Protection Dosimetry 24, n^o 1-4 (1 août 1988) : 127–31. http://dx.doi.org/10.1093/oxfordjournals.rpd.a080256.

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Abstract Measurements of the environmental and metabolic behaviour of the naturally occurring radionuclides have provided necessary information on the behaviour of stable elements and have been useful analogues in the study of man-made radionuclides. Uranium has been studied primarily because of its role in the nuclear industry and its possible effects as a heavy metal in occupational exposure cases. There is abundant literature dealing with uranium studies in animals, and some literature on human studies with chronically ill patients. Relatively few data are available which document the uranium concentrations in humans under chronic, low level environmental conditions. Some recent bone measurements performed at the US Department of Energy, Environmental Measurements Laboratory are presented. For comparison, a summary of published information on uranium concentrations in blood, soft tissues and bones of humans is also presented. These data are selected to eliminate results from areas of known elevated natural radionuclide levels and occupational or controlled experimental exposure cases. From the measurements of the uranium concentration in bone from 12 countries, it is possible to derive a cumulative frequency distribution for the sampled populations.

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Driver, Sam, et Iosif Brodskiǐ. « Uraniia ». World Literature Today 62, n^o 2 (1988) : 298. http://dx.doi.org/10.2307/40143680.

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Willit, J. L., W. E. Miller et J. E. Battles. « Electrorefining of uranium and plutonium — A literature review ». Journal of Nuclear Materials 195, n^o 3 (novembre 1992) : 229–49. http://dx.doi.org/10.1016/0022-3115(92)90515-m.

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Weerakkody, Emily N., Brian A. Read, Michael D. Clemenson et Nick G. Glumac. « Uranium Dust Cloud Combustion : Burning Characteristics and Absorption Spectroscopy Measurements ». Journal of Combustion 2022 (16 novembre 2022) : 1–23. http://dx.doi.org/10.1155/2022/3570238.

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This study characterized uranium metal dust cloud combustion using absorption spectroscopy, imaging, and broadband emission measurements. Other metals were similarly combusted to establish correlations between results from this study and those found in the literature. It was determined that the burn temperature of uranium was limited to the volatilization temperature of uranium dioxide. Combustion behavior was similar to that of other refractory metals in terms of burn time and the observation of exploding particle behavior.

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Zhang, Jingyue, Qing He et Wen Zhang. « Membrane-Based Electrochemical Detection of Uranium : A Review ». Separations 9, n^o 12 (1 décembre 2022) : 404. http://dx.doi.org/10.3390/separations9120404.

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The determination of uranium in environmental samples has always been a crucial environmental issue due to its adverse impacts on human life. Electrochemical detection is one of the most suitable methods for directly determining uranium because of its portable instrument and quick response characteristics. The ion-selective membrane in the working electrodes is selectively responsible for uranium transport and separation. This mini-review provides a general overview of the membrane-based ion-selective electrodes in detecting uranium ions reported in the literature. The ion-selective membranes are classified according to their ionophore categories. Furthermore, the limits and outlook are also discussed to provide a reference for further developing membrane-based electrochemical uranium sensors.

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Costa Peluzo, Bárbara Maria Teixeira, et Elfi Kraka. « Uranium : The Nuclear Fuel Cycle and Beyond ». International Journal of Molecular Sciences 23, n^o 9 (22 avril 2022) : 4655. http://dx.doi.org/10.3390/ijms23094655.

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This review summarizes the recent developments regarding the use of uranium as nuclear fuel, including recycling and health aspects, elucidated from a chemical point of view, i.e., emphasizing the rich uranium coordination chemistry, which has also raised interest in using uranium compounds in synthesis and catalysis. A number of novel uranium coordination features are addressed, such the emerging number of U(II) complexes and uranium nitride complexes as a promising class of materials for more efficient and safer nuclear fuels. The current discussion about uranium triple bonds is addressed by quantum chemical investigations using local vibrational mode force constants as quantitative bond strength descriptors based on vibrational spectroscopy. The local mode analysis of selected uranium nitrides, N≡U≡N, U≡N, N≡U=NH and N≡U=O, could confirm and quantify, for the first time, that these molecules exhibit a UN triple bond as hypothesized in the literature. We hope that this review will inspire the community interested in uranium chemistry and will serve as an incubator for fruitful collaborations between theory and experimentation in exploring the wealth of uranium chemistry.

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Semenov, Evgeny V., et Vladimir V. Kharitonov. « Calculation of the cost of enriched uranium products in multi-stream cascades of enrichment process ». Nuclear Energy and Technology 9, n^o 1 (8 mars 2023) : 19–25. http://dx.doi.org/10.3897/nucet.9.100752.

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Modern uranium enrichment facilities can simultaneously use several raw materials as feed, including natural uranium, regenerated uranium obtained as a result of SNF reprocessing, or depleted uranium (all in the form of uranium hexafluoride). As the output of the separating cascade, several types of enriched uranium product with different levels of enrichment can be fabricated simultaneously. The paper proposes a methodology, absent in literature, for calculating the cost of each enriched uranium product in multi-stream separating cascades. The proposed methodology uses standard definitions of the isotopic value of feed and product stream and the Peierls-Dirac separation potential. Numerical calculations of the cost of enriched uranium products for three production problems are provided as examples of the methodology effectiveness: 1) involvement of depleted uranium hexafluoride (DUHF) in fabrication of enriched uranium product; 2) simultaneous fabrication of two enriched products; 3) use of depleted uranium to reduce the cost of the product with a higher enrichment level out of two (as applied, e.g., to advanced tolerant fuel). It has been shown that partial additions of DUHF as feed for a multi-product separating cascade make it possible to reduce the cost of a product with a higher level of enrichment; with the current market prices for natural uranium and separative work, there is a range of tails assays in which it is more profitable to enrich DUHF rather than natural uranium.

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Ricci, Roberta. « Urania (review) ». MLN 119, n^o 1 (2004) : 193–97. http://dx.doi.org/10.1353/mln.2004.0069.

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T.I., Soliyev, et Muzafarov A.M. « Investigation of the Causes of Violations of the Radioactive Balance between Radionuclides of the Uranium Decay Chain ». International Journal of Multicultural and Multireligious Understanding 8, n^o 7 (8 juillet 2021) : 95. http://dx.doi.org/10.18415/ijmmu.v8i7.2882.

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Throughout the literature, it is mentioned that 15 radionuclides in the uranium decay chain have a constant radioactive equilibrium. Theoretical calculations give the value of the activity of each radionuclide in the uranium decay chain.This article examines various factors that affect the coefficient of radioactive equilibrium between radionuclides in the uranium decay chainThe concept of the coefficient of violations of nuclear equilibrium between radionuclides is adopted to determine the degree of violations in the uranium decay chain.Many nuclear-physical factors influence the radioactive balance between radionuclides. The most important of them is the recoil energy that the daughter nucleus receives when splitting from the mother nucleus.Another critical factor in the violation of the radioactive balance between radionuclides is the technological factor: leaching (acid, mini-reagent, bicarbonate, etc.) when leaching uranium by underground leaching of uranium.In addition, as a theoretical result of the study, the article presents a graphical relationship between the number of nuclear masses and the recoil energy of radionuclides in the uranium decay chain.

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Gilligan, Rorie, et Aleksandar N. Nikoloski. « The extraction of uranium from brannerite – A literature review ». Minerals Engineering 71 (février 2015) : 34–48. http://dx.doi.org/10.1016/j.mineng.2014.10.007.

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Hargreaves, Abigayle I., Eva Barker, Jaylyn Berry, Evan Dolley et Chad L. Pope. « A literature review of pyroprocessing safeguards ». Nuclear Science and Technology Open Research 2 (24 avril 2024) : 41. http://dx.doi.org/10.12688/nuclscitechnolopenres.17524.1.

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Pyroprocessing is a promising technology for reprocessing used nuclear fuel (UNF) from light water reactors (LWR) and sodium fast reactors (SFR). With the advancement of fast reactors with projects from companies such as TerraPower, the prospects of pyroprocessing are more promising than ever before, as fast reactors can consume all actinides, not just uranium and plutonium. Before pyroprocessing can be implemented commercially, pre-existing safeguards used for aqueous reprocessing must be adapted for pyroprocessing. Safeguards, as determined by both the Nuclear Regulatory Commission (NRC) and the International Atomic Energy Agency (IAEA), are discussed in this review as guidelines for approaches used in both domestic and international reprocessing plants. The implementation of safeguards in aqueous reprocessing was then reviewed based on the experience from existing aqueous facilities. The experimental pyroprocessing facilities were identified as pyroprocessing plants in the design stage with one operating exception of the Fuel Conditioning Facility (FCF). The safeguard methods implemented or designed for each and the accompanying challenges of utilizing existing safeguards in pyroprocessing are considered and a summary of applicable approaches is included.

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Doynikova, O. A., et V. A. Petrov. « Ore-Forming Biogenic Factor in the Formation of Sandstone-Type Uranium Deposits ». Geology of Ore Deposits 64, n^o 4 (août 2022) : 243–56. http://dx.doi.org/10.1134/s107570152204002x.

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Abstract—The geological environment of ore formation in sandstone-type uranium deposits is considered in light of modern geomicrobiological and ecological (environmental) mineralogical data related to solving environmental bioremediation problems (purification of the near-surface environment via bacterial fixation of radionuclides). Analysis of the literature data shows the possible ore-forming role of the biogenic factor in the formation of infiltration sandstone-type uranium deposits, which is considered here with an example of their paleochannel subtype with widespread phosphate black uranium ores. The bacterial factor is proposed as one of the main mechanisms for the occurrence and movement of the redox front during hypergene processes in ore-bearing sedimentary sandstone strata.

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Ao, Bingyun, Xiaolin Wang, Yongjun Wei et Yanzhi Zhang. « A simple hermetic sample holder for X-ray diffraction analysis of uranium hydride ». Journal of Applied Crystallography 40, n^o 4 (13 juillet 2007) : 796–98. http://dx.doi.org/10.1107/s0021889807024661.

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In order to help resolve unknowns regarding aging effects of uranium during long-term storage of tritium, a number of experiments have been carried out by several researchers. However, almost no literature is available on the structural change of uranium tritide, mainly because its high toxicity and air-sensitivity render appropriate experiments very difficult. In this paper, a simple hermetic sample holder that fits the Philips X'Pert Pro X-ray diffractometer is described. It may be used to study the aging effects of uranium tritide during storage. The sample holder mainly consists of an aluminium container for sample storage and a Mylar window for X-ray measurements. This sample holder can also be used with other air-sensitive, radioactive and toxic materials. In this paper, the first results obtained from X-ray diffraction analysis of uranium hydride are presented.

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Kryzia, Dominik, et Lidia Gawlik. « Forecasting the price of uranium based on the costs of uranium deposits exploitation ». Gospodarka Surowcami Mineralnymi 32, n^o 3 (1 septembre 2016) : 93–110. http://dx.doi.org/10.1515/gospo-2016-0026.

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Abstract The paper presents the concept of forecasting uranium prices on the basis of the uranium deposits exploitation costs. The model for estimating the costs of raw material extraction over time, depending on the supply level sufficient to meet the demand from nuclear power plants, has been developed. The aforementioned costs, given the inelastic demand for uranium, determine the price of this raw material. This allows estimating the future price of uranium on the basis of knowledge of the resource base and the relationships determining changes in parameters characterizing the resources. As these estimates are affected by considerable uncertainty, the study has used a stochastic approach, constructing the precise probability distributions of uncertain parameters. Based on literature analysis, the variables that are correlated with each other have been identified. The model has implemented the identified correlations between variables. A number of assumptions regarding the input data, model limitations, and the relationship between the variables has been adopted. On the basis of the Monte Carlo simulation, the probability distribution of uranium prices in the coming years until 2050 has been obtained. According to the obtained estimation, uranium prices will remain stable at around 90 USD/kg by 2030. The prices are expected to increase in the next years. It can be assumed that this trend will grow in the future. In 2050, the expected uranium price will be about 130 USD/kg.

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Krawczyk, J., A. Pietraszko, R. Kubiak et K. Łukaszewicz. « Diffuse scattering and short-range order in uranium iodine phthalocyanine [U1−x Pc2]I2−y and the X-ray structure analysis of crystals with diffuse superstructure reflections ». Acta Crystallographica Section B Structural Science 59, n^o 3 (23 mai 2003) : 384–92. http://dx.doi.org/10.1107/s0108768103004804.

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Crystals of uranium iodine phthalocyanine present an example of a disordered commensurate modulated structure of the intergrowth type. The short-range order of both uranium ions and iodine chains [I_3^-] n has been analysed by Reverse Monte Carlo (RMC) simulation of X-ray diffuse scattering. The diffraction pattern of uranium iodine phthalocyanine contains diffuse superstructure reflections. In the routine crystal structure analysis diffuse superstructure reflections may be either omitted or measured and classified along with other Bragg reflections. The crystal structure of uranium iodine phthalocyanine is an example of such ambiguity. The crystal structures of two specimens of [U1−x Pc2]I2−y with slightly different composition have been published in the literature with different space groups and unit cells. We have shown that the structure of both specimens differs only in the degree of short-range order and is isostructural with [YbPc2]I2. We have also shown that while the omission of diffuse reflections results in the average crystal structure, the treatment of these reflections as normal Bragg reflections is incorrect and produces the structure averaged over a limited small range.

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Angus, Siobhan. « Atomic Ecology ». October, n^o 179 (2022) : 110–31. http://dx.doi.org/10.1162/octo_a_00450.

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Abstract Susanne Kriemann's Pechblende explores the material histories and visual (im)possibilities of uranium. Through a focus on the materiality of uranium, the article explores how the medium of photography is entangled with atomic histories by focusing on a series of exhibitions that explore the histories of photography, mining, and the damage slowly wrought by environmental change. While the violence of uranium exposure eludes vision, atomic light materially challenges the boundaries of the visible and the invisible, most tangibly shown in X-rays and autoradiographs, the camera-less exposures “taken” by uranium. Reading Kriemann's work through an eco-critical lens that centers environmental justice and labor, I explore the role of photography and the archive in the Anthropocene. Kriemann's counter-archival photographic practice draws attention to the socio-ecological costs of resource extraction while probing the limits of the visible. The materiality of the climate crisis necessitates thinking about materials—and the tangible consequences of their use—alongside questions of representation.

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Bulatov, G. S., et Konstantin E. German. « New Experimental Data on Partial Pressures of Gas Phase Components over Uranium-Zirconium Carbonitrides at High Temperatures and Its Comparative Analysis ». Journal of Nuclear Engineering 3, n^o 4 (16 novembre 2022) : 352–63. http://dx.doi.org/10.3390/jne3040022.

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Data from the literature were analyzed and experimental data were obtained on the sublimation of uranium-zirconium carbonitrides with different contents of carbon, nitrogen and oxygen impurities in a wide temperature range (1773–2323 K). The composition of the gas phase was determined and the analytical dependences of the partial pressures of its components on temperature were calculated. It was shown that the sublimation of uranium-zirconium carbonitrides occurs incongruently with the predominant loss of nitrogen, which led to a shift in their compositions to the side richer in carbon. The chemical mechanism of sublimation was considered, according to which oxygen impurities in these materials contribute to the additional release of nitrogen and the appearance of oxide components UO, UO2 and CO in the gas phase. The introduction of zirconium carbonitrides and an increase in the carbon content led to a decrease in the partial pressures of uranium monoxide and nitrogen, thereby increasing the thermal stability of materials.

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Maulana Aliva, Muhammad Reza, Nofi Yendri Sudiar et Hamdi Hamdi. « SYSTEMATIC LITERATURE REVIEW (SLR) : NUCLEAR POWER PLANTS ». JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA 25, n^o 2 (28 juillet 2023) : 69. http://dx.doi.org/10.55981/tdm.2023.6871.

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Nuclear Power Plant (NPP) is a thermal power plant using one or several nuclear reactors as its heat source. NPP uses radioactive materials such as uranium as the heat source by utilizing fission reactions. The fission reaction produces enormous heat energy. Currently, there are many studies on NPPs, ranging from technological developments to the environmental impact of the NPP itself. This study aims to identify research developments on nuclear power plants from around the world obtained from relevant international journals in 2017-2023. The method used in this study is the Systematic Literature Review (SLR) method. The SLR method is used to identify, review, evaluate, and conclude all available research with interesting topic areas, with specific relevant research questions. Data were obtained by searching journals with Harzing's Publish or Perish application from the Scopus journal database. There are 191 journals with the keyword " Nuclear Power Plant " obtained from the Scopus database. Then these journals are filtered by type of article and if the number of citations is more than 32, then 49 articles are obtained which will be reviewed. This SLR method shows the development of research on NPP in several developed countries that have been using this technology for a long time. In addition, research topics such as the Fukushima accident, fault diagnostics, and safety assessment are the most discussed topics in the research so that they can be used as a reference for countries that are developing NPP.

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Sanchez, Melissa E. « The Politics of Masochism in Mary Wroth's Urania ». ELH 74, n^o 2 (2007) : 449–78. http://dx.doi.org/10.1353/elh.2007.0019.

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Davies, Stevie, et William B. Hunter. « Milton's Urania : "The Meaning, Not the Name I Call" ». Studies in English Literature, 1500-1900 28, n^o 1 (1988) : 95. http://dx.doi.org/10.2307/450717.

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Shelley, Jonathan. « Lies, Evasions, and Friendly Networks in Mary Wroth's Urania ». SEL Studies in English Literature 1500-1900 61, n^o 1 (2021) : 85–102. http://dx.doi.org/10.1353/sel.2021.0005.

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Sandy, Amelia Zurcher. « Pastoral, Temperance, and the Unitary Self in Wroth's Urania ». SEL Studies in English Literature 1500-1900 42, n^o 1 (2002) : 103–19. http://dx.doi.org/10.1353/sel.2002.0009.

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Bulatov, G. S., et K. E. German. « Comparative analysis of experimental data on the sublimation of uranium carbonitrides and uranium-zirconium carbonitrides at high temperatures ». Радиохимия 65, n^o 6 (15 décembre 2023) : 503–11. http://dx.doi.org/10.31857/s0033831123060011.

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The review is devoted to a comparison of new experimental data on the sublimation of uranium-zirconium carbonitrides with di erent contents of carbon, nitrogen, and oxygen impurities at high temperatures (1700- 2300 K), obtained by us in the past 2 years, with data of previous works presented in the literature on the sublimation of uranium carbonitrides, obtained by us and by other authors using mass spectrometry and some other methods of thermodynamic analysis. The main attention is paid to the consideration of the composition of the gas phase and the analytical dependences of the partial pressures of its components on temperature, as well as the chemical mechanism and heats of sublimation. The main feature of the sublimation process of all materials based on uranium carbonitride (both pure and doped with zirconium) is its incongruent nature, due to the loss of nitrogen, which leads to a shift in their compositions towards the phase with higher carbon content. The chemical mechanisms of sublimation of carbonitrides of both types are considered, according to which oxygen impurities in these materials lead to the appearance of oxide components UO, UO2 and CO in the gas phase and additional release of nitrogen. The introduction of zirconium into uranium carbonitride and an increase in the carbon content in it lead to a decrease in the partial pressures of uranium monoxide and nitrogen, which increases the thermal stability of this innovative fuel material.

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Dangelmayr, Martin A., Gilles Y. Bussod, Paul W. Reimus, Giday WoldeGabriel, Ran Calvo, Rose J. Harris, Philip H. Stauffer et al. « Uranium Retardation Capacity of Lithologies from the Negev Desert, Israel—Rock Characterization and Sorption Experiments ». Minerals 12, n^o 6 (6 juin 2022) : 728. http://dx.doi.org/10.3390/min12060728.

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A series of batch experiments were performed to assess the uranium sorption capacity of four mineralogically distinct lithologies from the Negev Desert, Israel, to evaluate the suitability of a potential site for subsurface radioactive waste disposal. The rock specimens consisted of an organic-rich phosphorite, a bituminous marl, a chalk, and a sandstone. The sorption data for each lithology were fitted using a general composite surface complexation model (GC SCM) implemented in PHREEQC. Sorption data were also fitted by a non-mechanistic Langmuir sorption isotherm, which can be used as an alternative to the GC SCM to provide a more computationally efficient method for uranium sorption. This is because all the rocks tested have high pH/alkalinity/calcium buffering capacities that restrict groundwater chemistry variations, so that the use of a GC SCM is not advantageous. The mineralogy of the rocks points to several dominant sorption phases for uranyl (UO22+), including apatite, organic carbon, clays, and iron-bearing phases. The surface complexation parameters based on literature values for the minerals identified overestimate the uranium sorption capacities, so that for our application, an empirical approach that makes direct use of the experimental data to estimate mineral-specific sorption parameters appears to be more practical for predicting uranium sorption.

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Kumar, Pradeep, et Ashok Khanna. « Extraction of Uranium from Aqueous Solution of Nitric Acid and Organic Solvent Using Ionic Liquid ». Asian Journal of Chemistry 33, n^o 1 (2020) : 43–48. http://dx.doi.org/10.14233/ajchem.2021.22916.

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In present study, tri-n-butylphosphate (TBP), a classical complexing agent for metallic cations, has been studied for the extraction of uranium into ionic liquids (ILs): 1-butyl-3-methylimidazoliumbis( tri-fluoromethylsulfonyl)imide ([BMIM][TF2N]) and trihexyl-tetradecylphosphonium-bis(trifluoromethylsulfonyl) imide ([P(14)666][TF2N]). Increasing HNO3 acidity of aqueous solution from 0.01 to 1 M the distribution ratio, DU decreases from 16 to 1.2 for 1.1 M TBP in [BMIM][TF2N] and the corresponding extraction efficiency (% E) varies from ~94 to 55. In the acidic range of 1 to 8 M DU and % E shows reversal trend of giving a local maximum at 8 M. This behaviour is compared and validates by literature. In contrast, on increasing in aqueous acidity from 0.01 to 8 M the extraction of uranium into [P(14)666][TF2N] ionic liquid, DU enhances from 2 to 39 and (%E) goes up from ~ 51 to 95. Since, [P(14)666][TF2N] works better than [BMIM][TF2N] in the acidic range > 0.1. This ionic liquid has been used for selective separation of uranium from strontium giving a DU of 63 and DSr of 2 with 98% E of uranium at 8 M acidity. To confirm the various species and groups in the formed complex, FTIR studies have been conducted.

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Fassina, Filippo. « Rosanna Gorris Camos, Urania o come insegnare i segreti del cosmo. «Urania polos docet et portenta polorum» (Guarino) ». Studi Francesi, n^o 167 (LVI | II) (1 juillet 2012) : 309. http://dx.doi.org/10.4000/studifrancesi.4029.

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GÜNAY, S. D., H. B. KAVANOZ, Ü. AKDERE et Ç. TAŞSEVEN. « THERMOPHYSICAL PROPERTIES OF URANIUM DIOXIDE : A MOLECULAR DYNAMICS STUDY OF SOLID AND LIQUID PHASES OF STOICHIOMETRIC UO2 ». International Journal of Modern Physics B 25, n^o 23n24 (30 septembre 2011) : 3211–23. http://dx.doi.org/10.1142/s0217979211101806.

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Thermodynamic and transport properties of solid and liquid uranium dioxide were studied using classical molecular dynamics simulation, with a newly parametrized interionic model potential. In addition to the static and transport properties which have been previously reported by the authors, this study further confirms that temperature dependence of the calculated thermophysical properties of uranium dioxide are in agreement with the available experimental data at both solid and liquid phases in providing an alternative rigid ion potential to the other model potentials in literature. Although lattice parameter and density have been underestimated, overall results give a fairly good description of the UO 2 system for wide range of temperature (0–4000 K). The transition to the superionic phase, Bredig transition, was successfully observed as a distinct λ-peak in specific heats at about 400 K below the experimental value. The results presented in our previous article and here show that the introduced alternative model potential for uranium dioxide is very promising and we are confident in the success of its use in future studies.

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Nace, Nicholas D. « The Publication of Urania Johnson's "Unpublishable" "Almira" ». Papers of the Bibliographical Society of America 103, n^o 1 (mars 2009) : 5–18. http://dx.doi.org/10.1086/pbsa.103.1.24293777.

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Wasim, M. « Interferences in instrumental neutron activation analysis by threshold reactions and uranium fission for miniature neutron source reactor ». ract 101, n^o 9 (septembre 2013) : 601–6. http://dx.doi.org/10.1524/ract.2013.2064.

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Summary Miniature neutron source reactors (MNSR) are known for their stable neutron flux characteristics and are mostly employed for neutron activation analysis (NAA). Interfering reactions are sometimes observed in instrumental neutron activation analysis (INAA). Failure to correct for these interferences produces significant systematic positive errors. This paper provides correction factors for the interferences caused by the threshold reactions and fission products of 235U. These factors were calculated by using the experimentally determined thermal, epithermal and fast neutron flux and epithermal neutron flux shape factor and the nuclear data from the literature using the Høgdahl convention. Correction factors were calculated for (n, p) and (n, α) reactions for the most commonly observed radionuclides in INAA. Similarly, correction factors for uranium fission were calculated for 9 elements (Ce, Ba, La, Mo, Nd, Pd, Ru, Sm and Zr). The correction factors were validated by analyzing different materials. A comparison of uranium fission factors with those published in the literature showed a good agreement except for 97Zr, 99Mo and 131Ba which is due to difference in the flux characteristics. In general, these factors can be used with confidence.

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Elsesmita, Sabrina Ermayanti et Dewi Wahyu Fitrina. « Effect of Radon and Lung Cancer Risk : A Narrative Literature Review ». Bioscientia Medicina : Journal of Biomedicine and Translational Research 6, n^o 15 (3 novembre 2022) : 2691–98. http://dx.doi.org/10.37275/bsm.v6i15.669.

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Exposure to cigarette smoke has been known to be a major risk factor for lung cancer. Although smoking has long been considered the main cause of lung cancer, about 5 to 25% of lung cancer cases occur in non-smokers. Radon is said to be the second most important cause of lung cancer after smoking. Radon-222 is a chemical element in the form of a highly radioactive gas that comes from the decay of the parent radioactive element, uranium, which is found in the earth's crust. Inhaled radon gas can adhere to the mucosal lining of the airways and damage the airway epithelium. The process of ionizing radiation by alpha particles due to the decay of radioactive substances can cause mutations and chromosomal aberrations, severance of DNA double chains, and formation of reactive oxygen species. (ROS) that cause cell cycle changes, up-and down-regulation of cytokines, and increased production of proteins associated with cell cycle regulation and carcinogenesis. Research on radon and lung cancer has not been widely conducted in Indonesia. This literature review aims to describe radon and its effects on lung health.

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Vecchia, Adriana Mônica Dalla, Paulo César Horta Rodrigues, Francisco Javier Rios et Ana Claudia Queiroz Ladeira. « Investigations into Pb isotope signatures in groundwater and sediments in a uranium-mineralized area ». Brazilian Journal of Geology 47, n^o 1 (janvier 2017) : 147–58. http://dx.doi.org/10.1590/2317-4889201720160100.

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ABSTRACT: This work presents the investigation in an environment that contains uranium deposits by using Pb isotope signatures. The study area, southeast of Brazil, is characterized by the lack of surface water and, as a consequence, the groundwater plays an important role in the economy of the region, such as the supply to the uranium industry and, above all serving the needs of the local population. The objective of the present investigation is the determination of the signatures of Pb in groundwater and sediments as well as the identification of environments under influences of geogenic and/or anthropogenic sources. It was determined that the Pb in the majority of sediments was geogenic in origin. Although data from the literature, related to the environmental studies, consider 206Pb/207Pb isotopic ratio values below or close to 1.2 as an indicative of anthropogenic Pb, the 206Pb/ 207Pb determined for the majority of groundwater samples ranged from 1.14 to 1.19, and are similar to the data reported for rocks samples (1.09 to 1.96) from area with U mineralization. It was also determined that the anthropogenic influence of the uranium was restricted to a single sampling point within the mining area.

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Xiong, Yongliang, et Yifeng Wang. « Uranyl oxalate species in high ionic strength environments : stability constants for aqueous and solid uranyl oxalate complexes ». Radiochimica Acta 109, n^o 3 (22 janvier 2021) : 177–85. http://dx.doi.org/10.1515/ract-2020-0083.

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Abstract Uranyl ion, UO2 2+, and its aqueous complexes with organic and inorganic ligands can be the dominant species for uranium transport on the Earth surface or in a nuclear waste disposal system if an oxidizing condition is present. As an important biodegradation product, oxalate, C2O4 2−, is ubiquitous in natural environments and is known for its ability to complex with the uranyl ion. Oxalate can also form solid phases with uranyl ion in certain environments thus limiting uranium migration. Therefore, the determination of stability constants for aqueous and solid uranyl oxalate complexes is important not only to the understanding of uranium mobility in natural environments, but also to the performance assessment of nuclear waste disposal. Here we developed a thermodynamic model for the UO2 2+–Na+–H+–Cl––ClO4 ––C2O4 2––NO3 ––H2O system to ionic strength up to ∼11 mol•kg−1. We constrained the stability constants for UO2C2O4(aq) and UO2(C2O4)2 2− at infinite dilution based on our evaluation of the literature data over a wide range of ionic strengths up to ∼11 mol•kg−1. We also obtained the solubility constants at infinite dilution for solid uranyl oxalates, UO2C2O4•3H2O, based on the solubility data over a wide range of ionic strengths. The developed model will enable for the accurate stability assessment of oxalate complexes affecting uranium mobility under a wide range of conditions including those in deep geological repositories.

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Bryce, Judith. « Urania by Giulia Bigolina , Valeria Finucci (review) ». Modern Language Review 98, n^o 3 (juillet 2003) : 801–2. http://dx.doi.org/10.1353/mlr.2003.a827309.

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Bryce, Judith. « Urania by Giulia Bigolina , Valeria Finucci (review) ». Modern Language Review 99, n^o 3 (juillet 2004) : 801–2. http://dx.doi.org/10.1353/mlr.2004.a826932.

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Mohammed, Rahisa, Peace Ogadi, Dennis M. Seth, Amrutaa Vibho, Sarah K. Gallant et Rory Waterman. « Synthesis and Characterization of 2-(((2,7-Dihydroxynaphthalen-1-yl)methylene)amino)-3′,6′-bis(ethylamino)-2′,7′-dimethylspiro[isoindoline-1,9′-xanthen]-3-one and Colorimetric Detection of Uranium in Water ». Molbank 2023, n^o 3 (15 septembre 2023) : M1725. http://dx.doi.org/10.3390/m1725.

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2-(((2,7-Dihydroxynaphthalen-1-yl)methylene)amino)-3′,6′-bis(ethylamino)-2′,7′-dimethylspiro[isoindoline-1,9′-xanthen]-3-one was synthesized using Rhodamine 6G hydrazide (prepared using literature methods) and commercially available 2,7-dihydroxynaphthalene-1-carbaldehyde via imine condensation. Structural characterization was performed using FT-IR, 1H-NMR, 13C-NMR, X-ray, and HRMS. This Schiff base shows promise as a ligand for the colorimetric analysis of uranium in water.

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Hennig, Theresa, et Michael Kühn. « Uranium migration through the Swiss Opalinus Clay varies on the metre scale in response to differences of the stability constant of the aqueous, ternary uranyl complex Ca2UO2(CO3)3</sub&gt ; ». Advances in Geosciences 56 (9 novembre 2021) : 97–105. http://dx.doi.org/10.5194/adgeo-56-97-2021.

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Abstract. The simulation of uranium migration through the Swiss Opalinus Clay is used as an example to quantify the influence of varying values of a stability constant in the underlying thermodynamic database on the migration lengths for the repository scale. Values for the stability constant of the neutral, ternary uranyl complex Ca2UO2(CO3)3 differ in literature by up to one order of magnitude. Within the studied geochemical system, either the neutral or the anionic complex CaUO2(CO3)32- is the predominant one, depending on the chosen value for the neutral complex. This leads to a changed interaction with the diffuse double layers (DDL) enveloping the clay minerals and thus can potentially influence the diffusive transport of uranium. Hence, two identical scenarios only differing in the value for the stability constant of the Ca2UO2(CO3)3 complex were applied in order to quantify and compare the migration lengths of uranium on the host rock scale (50 m) after a simulation time of one million years. We ran multi-component diffusion simulations for the shaly and sandy facies in the Opalinus Clay. A difference in the stability constant of 1.33 log units changes the migration lengths by 5 to 7 m for the sandy and shaly facies, respectively. The deviation is caused by the anion exclusion effect. However, with a maximum diffusion distance of 22 m, the influence of the stability constant of the Ca2UO2(CO3)3 complex on uranium migration in the Opalinus Clay is negligible on the host rock scale.

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Babenko, S. P., Andrey V. Badyin et A. V. Ovchinnikov. « ON THE POSSIBILITY OF THE RAPID ASSISTANCE TO PEOPLE AFTER A SINGLE EXPOSURE TO URANIUM HEXAFLUORIDE ». Hygiene and sanitation 97, n^o 3 (15 mars 2018) : 213–19. http://dx.doi.org/10.18821/0016-9900-2018-97-3-213-219.

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Introduction. The accidental release of uranium hexafluoride (UHF) is associated with the pollution of the air of the working premises with its hydrolysis products, containing toxic substances (uranium and fluorine). The intake of UHF hydrolysis products by is related to a negative impact on the human body. The magnitude and the rate of the exposure are determined by the amount of deposited toxic substances. Known methods for the determination of these amounts are based on the study of involved biological media (urine, blood, postmortem examination of all organs), requiring time-consuming, sometimes are critical for the preservation of the human life. In this paper, we propose a theoretical method for the detecting the amount of the deposited toxic substances. The calculation is based on models constructed by authors of this article. They describe successively: pollution of the working premises with UHF hydrolysis products, the input of toxic substances in the human body, uranium and passing fluorine through the body. The first model includes the following processes: hydrolysis, the formation of aerosol particles as on the deposition gas molecules and the wall of working space as on the human skin, deposition of the aerosol particles on the floor of the working space. With continuity equations written for the concentrations of molecules of substances of interest to us, the analytical expressions for n(z,t) - the concentration of atoms of a toxic substance at the height z at the time t; j(t) - flux density of toxic substance atoms on the surface of the skin at the time t. The second and third models describe percutaneous intake and inhalation of uranium and fluorine consisting of UHF hydrolysis products entering the human body, as well as toxic substances passed through the body. Results. There are presented results of calculating the amounts deposited in the body of uranium fluoride at various time points. There is given a comparison of these values with the experimental data in the literature on the quantity of uranium and fluorine, which enters the body to cause various organic and functional changes. Conclusion. The theoretical method of determining a person’s level of the destruction was concluded to allow extending the prediction of the development of adverse effects of uranium and fluorine without its prior survey, and choose the most effective methods of healthcare provision.

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Cardoso, Altair Costa, Camila Santana Dias, Carlos Henrique Rodrigues de Moura, Josiel Lobato Ferreira, Emerson Cardoso Rodrigues, Emanuel Negrão Macêdo, Diego Cardoso Estumano et Bruno Marques Viegas. « Use of Bayesian Methods in the Process of Uranium Bioleaching by Acidithiobacillus ferrooxidans ». Applied Sciences 14, n^o 1 (22 décembre 2023) : 109. http://dx.doi.org/10.3390/app14010109.

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This research is focused on investigating the utilization of Bayesian methodologies, specifically the Markov Chain Monte Carlo method, as well as filter sampling by importance and sequential resampling. The objective is to estimate kinetic parameters and state variables associated with the uranium bioleaching process by Acidithiobacillus ferrooxidans. Experimental data of cell concentration, uranium concentration, and concentrations of ferrous and ferric ions, obtained from literature, were employed. These measurements were evaluated using a mathematical model expressed by a system of ordinary differential equations. Three different mathematical models were evaluated, considering different uncertainties in experimental measurements and mathematical models (1% and 5%). The estimation results presented a good fit to the experimental data, with coefficients of determination in the range of 0.95 to 0.99. The validation of the mathematical models was obtained by reproducing the experimental measurements and the Bayesian techniques proved to be suitable for application in the bioleaching process.

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LAMB, MARY ELLEN. « The Biopolitics of Romance in Mary Wroth's The Countess of Montgomery's Urania ». English Literary Renaissance 31, n^o 1 (janvier 2001) : 107–30. http://dx.doi.org/10.1111/j.1475-6757.2001.tb01184.x.

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Armstrong, D. P., R. J. Jarabek et W. H. Fletcher. « Micro-Raman Spectroscopy of Selected Solid UxOyFz Compounds ». Applied Spectroscopy 43, n^o 3 (mars 1989) : 461–68. http://dx.doi.org/10.1366/0003702894203002.

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Micro-Raman spectroscopy has been utilized to examine the spectra of solid samples of α-UF5, β-UF5, UF6, three types of UO2F2, the powder residue from a static UF6 release, and γ-UO3. The spectra are presented and compared to previous literature values, with new features indicated where appropriate. With the implied constraint of proper sample handling, micro-Raman spectroscopy is a useful technique for the ready identification of uranium fluorides, oxyfluorides, and oxides.

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Magier, Mariusz. « THE ROLE OF ADIABATIC SHEAR BANDS EFFECT IN PENETRATION PROCESS ». PROBLEMY TECHNIKI UZBROJENIA 147, n^o 3/2018 (4 janvier 2019) : 7–17. http://dx.doi.org/10.5604/01.3001.0012.8308.

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The phenomenon of creation of adiabatic shear bands occurring at extreme strains of investigated material is analysed in the paper. The effects of penetration for projectiles made of depleted uranium and tungsten sinters were compared to analyse an influence of the adiabatic shear bands into the process of penetration and to show some possibilities for structural modification of tungsten sinters increasing the penetration capabilities. The comparative analyses were conducted on the base of literature review.

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Nace, N. D. « A Second Novel by Urania Johnson ». Notes and Queries 57, n^o 1 (13 janvier 2010) : 109–11. http://dx.doi.org/10.1093/notesj/gjp259.

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