Готові списки джерел за темами / U234

Добірка наукової літератури з теми "U234"

Автор: Grafiati
Опубліковано: 19 червня 2021
Оновлено: 13 лютого 2022

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Статті в журналах з теми "U234":

1

Mammadov, Khagani Farzulla, Hajar Nuhbala Shiraliyeva, Elnur Ismikhan Mehtiyev, Ulviyya Salam Aliyeva-Jabbarly, Elchin Ilham Guliyev, Nijat Agil Mirzayev, and Aynur Huseyn Huseynova. "Studying the treatment processes of soil samples from radionuclides." ScienceRise, no. 3 (June 30, 2021): 29–33. http://dx.doi.org/10.21303/2313-8416.2021.001920.

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Object of research: Soil samples contaminated with radionuclides and processes for treatment of contaminated soil. The problem to be solved: Isolation of radionuclides from contaminated soil samples by extraction with weak solutions of acids and alkalis. Main scientific results: Treatment of soil samples contaminated with uranyl nitrate using extraction with weak solutions of nitric and hydrochloric acid, caustic sodium and subsequent washing of soil residues with distilled water is effective process and leads to a more than tenfold decrease in the content of uranium isotopes (U238, U235, U234 and U236) in the soil samples. At the same time, there is a decrease in the content of natural radionuclides (Na22, K40, Zn65, Sn113, Sn126) in the extracted soil samples. An increase in their content in the extract of the analyzed soil samples corresponds to a decrease in their content in the residue of the extracted soil samples. The analysis of the values of the decrease in the content of natural radionuclides in the soil contaminated with uranyl nitrate corresponds to the values of the decrease in their content in the identical soil, but not contaminated with uranium isotopes. The combined extraction with weak solutions of acids and alkalis leads to the enrichment of the soil with nitrates and chlorine-containing compounds. The area of practical use of the research results: Subdivisions of the Ministry of Emergency Situations and Chemical Troops specializing in the study of emergencies and natural disasters can use the results of these studies in the elimination of the consequences of global environmental disasters and incidents that pose a threat to the life of the civilian population and the personnel of paramilitary units. Innovative technological product: The proposed method for treatment of soil contaminated with radionuclides makes it possible to more than tenfold reduce their concentration in the soil. Scope of application of an innovative technological product: treatment of contaminated soil in areas affected by nuclear tests or accidents at nuclear power plants.
2

Berman, B. L., J. T. Caldwell, E. J. Dowdy, S. S. Dietrich, P. Meyer, and R. A. Alvarez. "Photofission and photoneutron cross sections and photofission neutron multiplicities forU233,U234,Np237, andPu239." Physical Review C 34, no. 6 (December 1, 1986): 2201–14. http://dx.doi.org/10.1103/physrevc.34.2201.

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3

Do Carmo, Everton Crivoi, Allan Inoue, Cesar Cavinato Cal Abad, Frederico Antonio dos Santos Andrade, Valmor Tricoli, and Renato Barroso. "Pacing strategy during Olympic Cross-Country Mountain Bike: effects of performance level, age and sex." Journal of Science and Cycling 9, no. 1 (June 30, 2020): 13–24. http://dx.doi.org/10.28985/0620.jsc.04.

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Objectives: the aim of the present study was to verify the pacing strategy during a season of a Cross-Country Mountain Bike (XCO-MTB) and the effects of performance level, age and sex. Method: Overall, 802 paces in 4 age-sex categories were analyzed: male elite (EliteM; n = 272), female elite (EliteF; n = 170), male under-23 (U23M; n = 247) and female under-23 (U23F; n = 113). Races were divided into Initial Lap; middle one (Middle1); middle two (Middle2) and Final Lap. The athletes were divided into high performance (HP); intermediated performance (IP) and low performance (LP). The magnitude-based inference and the effect size were assessed to check the changes clinically important. Results: it was observed a similar fast-start strategy for all categories. Both HP EliteM and EliteF athletes showed higher speed in Final Lap than LP (EliteM - ES = 0.5; 90%CI -0.8 to -0.2; very likely and EliteF - ES = 1.0; 90%CI -1.4 to -0.6; almost certain). The U23F athletes showed higher speeds in Initial Lap than EliteF (ES = 0.21; 90%CI - 0.1 to 0.5; likely), however in Final Lap the speeds was lower in U23F (ES = 1; 90%CI -1.3 to -0.6; very likely). Conclusion: the fast-start strategy is typically used during a XCO-MTB race independently of performance level, age or sex. HP Elite athletes are able to maintain higher speeds in the Final Lap. U23F athletes used to do a more variable pacing strategy with more aggressive fast-start strategy and lower speed in Final Lap than EliteF.
4

Матьовка, О. М., М. В. Стець, and В. Т. Маслюк. "Model nuclide spectrum of the Th232, U235 and U238 series." Scientific Herald of Uzhhorod University.Series Physics 27 (June 30, 2010): 39–44. http://dx.doi.org/10.24144/2415-8038.2010.27.39-44.

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5

Usera, Juan. "RECENSIÓN. Preusser, F. Hajdas, I. & Ivy-Ochs. S. (eds.) 2008. Recent progress in Quaternary dating methods. E & G Quaternary Science Journal, 252 pp." Spanish Journal of Palaeontology 24, no. 1 (February 12, 2021): 105. http://dx.doi.org/10.7203/sjp.24.1.20347.

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La datación de los materiales cuaternarios ha sido, desde siempre, uno de los principales problemas con los que se han encontrado los investigadores que trabajan en esta Época o Sistema. Esto es verificable por los numerosos trabajos dedicados a precisar la edad de los afloramientos mediante estudios isotópicos, Luminiscencia, Racemización de aminoácidos, reacciones inducidas por la radiación cósmica, Paleomagnetismo, ESR (Electron Spin Resonance), etc. Los trabajos editados por Preusser et al. (2008) recogen una parte importante de los métodos más recientes utilizados en la datación de los materiales cuaternarios. Algunos son bien conocidos como las dataciones por isótopos del Carbono, como el C14, o del U234/Th230. Otros métodos de datación de materiales cuaternarios no son tan conocidos, como la utilización de la EMF (Earth’s Magnetic Field. Así mismo, se tratan las dataciones por Luminiscencia. El trabajo continúa con un análisis de los resultados de las dataciones basadas en las señales de ESR, en cuarzos sometidos a diferentes situaciones ambientales. Otro de los procedimientos expuestos en este número especial de E & G Quaternary Science Revue, son las dataciones a partir de nuclidos cosmogénicos. Por último, hay que tener en cuenta, que la mayor parte de las propuestas de estos procedimientos de datación se hacen aplicables sobre todo a materiales continentales: depósitos fluviales, glaciares, eólicos y también yacimientos arqueológicos, aunque hay referencias a lo largo de los trabajos a su aplicación con éxito a materiales de origen marino.
6

Griffin, Brendan J., Duncan Forbes, and Neal J. McNaughton. "An Evaluation of Dating of Diagenetic Xenotime by Electron Microprobe." Microscopy and Microanalysis 6, S2 (August 2000): 408–9. http://dx.doi.org/10.1017/s143192760003453x.

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Xenotime is an igneous mineral commonly present in pegmatite and fractionated granite. Recent studies reveal that it also forms as a diagenetic mineral. Minute (0.1-5 μm) xenotime overgrowths typically crystallise on the surfaces of detrital zircon shortly after sedimentation, in a wide range of siliciclastic sedimentary units. For example, in backscattered electron (BSE) imaging using a scanning electron microscope (SEM), two minute, euhedral, pyramidal, xenotime overgrowths on an oscillatory-zoned detrital Ambergate zircon are evident (figure 1).Electron microprobe analysis (EMPA) geochronology is a chemical dating method that uses precisely measured concentrations of U, Th, and Pb, and the decay rates of U238, U235, and Th232, to calculate an age for a mineral. The EMPA dating method used in this study to date igneous xenotime and igneous-metamorphic monazite is the chemical isochron method (CHIME). EMPA geochronology is not a widely used technique because of the higher precision of isotopic geochronology.
7

Kondylakis, J. S. "Theoretically and under very special applied conditions a nuclear fission reactor may explode as nuclear bomb." HNPS Proceedings 18 (November 23, 2019): 121. http://dx.doi.org/10.12681/hnps.2558.

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This article/presentation describes a theoretical and applied research in nuclear fission reactor systems. It concerns with theoretical approaches and in very special applied cases consideration where a common nuclear fission reactor system may be considered to explode as nuclear bomb. This research gives critical impacts to the design, operation, management and philosophy of nuclear fission reactors systems. It also includes a sensitivity analysis of a particular applied problem concerning the core melting of a nuclear reactor and its deposit to the bottom of reactor vessel. Specifically, in a typical nuclear fission power reactor system of about 1000 MWe, the nuclear core material (corium) in certain cases can be melted and it may deposited in the bottom of nuclear reactor vessel. So, the nuclear criticality conditions are evaluated for a particular example case(s). Assuming an example composition of melted corium of 98 tones of U238 , 1 tone of U235 , 1 tone Pu239 and 25 tones Fe56 (supporting material) in a 5 m diameter of a finite cylindrical nuclear reactor vessel it is found that it may result in nuclear criticality above the unit. This condition corresponds to Supercritical Fast Nuclear Fission Reactor case, which may under certain very special applied conditions to nuclear explode as nuclear bomb.
8

Ohtsuki, T., Y. Nagame, K. Tsukada, N. Shinohara, S. Baba, K. Hashimoto, I. Nishinaka, et al. "Mass yield curves in low-energy proton-induced fission ofU233,U235,U236,Np237,Pu239,Pu242,Pu244,Am241, andAm243." Physical Review C 44, no. 4 (October 1, 1991): 1405–23. http://dx.doi.org/10.1103/physrevc.44.1405.

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9

Tan, Yee-Joo, Eileen Teng, Shuo Shen, Timothy H. P. Tan, Phuay-Yee Goh, Burtram C. Fielding, Eng-Eong Ooi, Hwee-Cheng Tan, Seng Gee Lim, and Wanjin Hong. "A Novel Severe Acute Respiratory Syndrome Coronavirus Protein, U274, Is Transported to the Cell Surface and Undergoes Endocytosis." Journal of Virology 78, no. 13 (July 1, 2004): 6723–34. http://dx.doi.org/10.1128/jvi.78.13.6723-6734.2004.

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ABSTRACT The severe acute respiratory syndrome coronavirus (SARS-CoV) genome contains open reading frames (ORFs) that encode for several genes that are homologous to proteins found in all known coronaviruses. These are the replicase gene 1a/1b and the four structural proteins, nucleocapsid (N), spike (S), membrane (M), and envelope (E), and these proteins are expected to be essential for the replication of the virus. In addition, this genome also contains nine other potential ORFs varying in length from 39 to 274 amino acids. The largest among these is the first ORF of the second longest subgenomic RNA, and this protein (termed U274 in the present study) consists of 274 amino acids and contains three putative transmembrane domains. Using antibody specific for the C terminus of U274, we show U274 to be expressed in SARS-CoV-infected Vero E6 cells and, in addition to the full-length protein, two other processed forms were also detected. By indirect immunofluorescence, U274 was localized to the perinuclear region, as well as to the plasma membrane, in both transfected and infected cells. Using an N terminus myc-tagged U274, the topology of U274 and its expression on the cell surface were confirmed. Deletion of a cytoplasmic domain of U274, which contains Yxxφ and diacidic motifs, abolished its transport to the cell surface. In addition, U274 expressed on the cell surface can internalize antibodies from the culture medium into the cells. Coimmunoprecipitation experiments also showed that U274 could interact specifically with the M, E, and S structural proteins, as well as with U122, another protein that is unique to SARS-CoV.
10

Sang, Yurou, Rui Zhang, A. Louise Creagh, Charles A. Haynes, and Suzana K. Straus. "Interactions of U24 from Roseolovirus with WW domains: canonical vs noncanonical." Biochemistry and Cell Biology 95, no. 3 (June 2017): 350–58. http://dx.doi.org/10.1139/bcb-2016-0250.

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U24 is a C-terminal membrane-anchored protein found in both human herpes virus type 6 and 7 (HHV-6 and HHV-7), with an N-terminal segment that is rich in prolines (PPxY motif in both HHV-6A and 7; PxxP motif in HHV-6A). Previous work has shown that U24 interacts strongly with Nedd4 WW domains, in particular, hNedd4L-WW3*. It was also shown that this interaction depends strongly on the nature of the amino acids that are upstream from the PY motif in U24. In this contribution, data was obtained from pull-downs, isothermal titration calorimetry, and NMR to further determine what modulates U24:WW domain interactions. Specifically, 3 non-canonical WW domains from human Smad ubiquitination regulatory factor (Smurf), namely hSmurf2-WW2, hSmurf2-WW3, and a tandem construct hSmurf2-WW2 + 3, were studied. Overall, the interactions between U24 and these Smurf WW domains were found to be weaker than those in U24:Nedd4 WW domain pairs, suggesting that U24 function is tightly linked to specific E3 ubiqitin ligases.
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Статті в журналах

Дисертації з теми "U234":

1

Hedin, Thomas. "Geokemisk utvärdering av uran i LKAB:sgruvvatten i Malmberget : Sammanställning och tolkning av mätdata." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85586.

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Havs- och vattenmyndigheten har tagit fram föreskrifter om klassificering, miljökvalitetsnormer och bedömningsgrunder avseende ekologisk status av ytvatten där uran klassificeras som ett särskilt förorenade ämne. LKAB som är ett statligt ägt bolag som bedriver gruvverksamheter i Kiruna, Malmberget och Svappavaara har ålagt sig att utreda förekomsten av uran i sitt gruvvatten. Denna studie har sitt fokus på gruvverksamheten i Malmberget där höga koncentrationer av uran har upptäckts i gruvvattnet och källan till detta behöver utredas. Examensarbetet har utförts tillsammans med Luleå Tekniska Universitet och LKAB.  LKAB har utfört vattenprovtagningar i gruvvatten en gång under 2018, 2019 och 2021 varderna samt i bergborrade hål en gång under 2019 samt 2021. Proverna har analyserats efter metaller och isotoper. Gruvvattnet har generellt mycket högre uranhalter. Isotopkvoten 234U/238U har studerats för att spåra källan till uranet och resultaten visar ett flertal källor där fyra övergripande grupperingar kunde påvisas. Även data från borrkärnor har studerats för att jämföra spatiala variationer mellan vattenproverna och de fasta proverna från borrkärnorna. Hypotesen har varit att oxiderat yt- och grundvatten infiltrerar gruvan och lakar ut uran från mineralen uraninit, anhydrit, gips, titanit, apatit, monazit och stilbit. Hypotesen har varit baserad på den litteraturstudie som utförts samt tidigare studier i Malmberget.  Datatolkning inom varje grupp samt visualisering av data har utförts i ioGAS, Leapfrog, QGIS, PHREEQC, Geochemist Workbench och Excel. Resultaten indikerar att de höga koncentrationerna av uran är en följd av gruvverksamheten. Uranet mobiliseras av oxiderat vatten som infiltrerar gruvan från både inras-zoner och naturliga sprickbildningar och transporteras som karbonatkomplex. Projektet har även påvisat att uranförekomsterna i det Västra fältet av Malmberget troligtvis domineras av uraninit medan det Östra fältet troligtvis domineras även av anhydrit, gips och salter. Vidare har de högsta koncentrationerna av uran i berg lokaliserats i granit och pegmatit i samband med hydrotermala zoner i granitisk berggrund. Även malmen har genom SEM-analys påvisats innehålla uranmineral i inneslutningar i titanit. Resultatet har visat att kvoten 234U/238U kan användas som en indikator till olika källor av uran. För att visa vilka mineral som är dominerande och bidragande källor till de höga urankoncentrationerna i Malmbergets gruvvatten behöver mineralogin undersökas mer noggrant och i större omfattning.
2

Warren, Stuart. "Development of the STEFF detector for the neutron Time Of Flight facility (n TOF), CERN." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/development-of-the-steff-detector-for-the-neutron-time-of-flight-facility-n-tof-cern(b1e862e4-a841-47ef-a0b4-7834693f64fe).html.

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Significant work has been performed on the development of STEFF (SpecTrometer for Exotic Fission Fragments), a 2E2V (2-Energy 2-Velocity) spectrometer built by the University of Manchester Fission Group. The majority of this work was in the development of the time-of-flight systems, in particular the stop detector; with the main goals of improving the timing resolution and the detection effciency of the fission fragments. Further development of the STEFF spectrometer was done to enable 2E2V measurements of the 235U(n,f) reaction with coincident measurements using a white neutron spectra of energies ranging from 10 meV to200 MeV provided by the n TOF (neutron Time Of Flight) facility, CERN. The STEFF spectrometer was successfully operated twice on the Experimental Area-2 high flux pulsed neutron beam line resulting in 2E2V measurements for fission events with neutron energies ranging from 20 meV to 10 MeV. The first experiment received 1.36x10^18 POT (Protons On Target) with stable conditions and the second received 1.53x10^18 POT with stable conditions. The development of the stop detector resulted in a replacement MWPC (Multi-Wire Proportional Counter) detector for the second of the two experiments. This allowed direct comparison for the timing coincidence resolution, sigma_c, between the start and stop detectors and gave sigma_c = 0.81+/-0.08 ns for the prior PPAC (Parallel Plate Avalanche Counter) detector and sigma_c = 0.40 +/- 0.04 ns for the MWPC. The MWPC gave improved the detection efficiency per fission fragment of Eff = 0.67 compared to Eff = 0.43 for the PPAC. The methods and research described in this work also provided alternate stop detector designs with greater performance. This work produced two large data sets from the two successful deployments of the STEFF spectrometer on the n TOF beam line that will be the future work of many nuclear structure scientists to come.
3

Zhang, Rui. "Probing the interaction between U24 from HHV-6A and Smurf2 WW domains." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/53953.

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This thesis describes the study of the interaction of the U24 membrane protein, encoded by Human Herpesvirus type-6A (HHV-6A), with WW domains from Smad ubiquitylation regulatory factor 2 (Smurf2) via its PPxY motif. U24 from HHV-6A is of interest because it acts to block endosomal recycling, as mediated by its PPxY motif interacting with WW domain-containing proteins. We have used a multidisciplinary approach to study the interactions between the Smurf2 WW domains and the PPxY motif-containing region of U24. The GST pull-down experiment demonstrated a difference in affinity between WW domains for the full-length U24 protein, prompting binding studies on interactions between the PPxY motif-containing region of U24 and isolated WW3 domain or WW2 and WW3 domains in tandem (WW23). In Chapter 2, studies were focused on interactions between the third WW domain (WW3) of Smurf2, and the 15-mer U24 peptide containing the PPxY motif. NMR studies demonstrated that the PPxY motif of U24 peptide bound to Smurf2 WW3 domain in a similar way as the interaction between Smurf2 WW3 domain and its cognate ligand Smad7. The dissociation constant was determined to be 123 ± 4 μM at 5°C, reflecting weak binding affinity between WW3 domain and U24 peptide, possibly due to the lack of additional interactions between WW3 domain and the region of U24 peptide beyond the PPxY motif. Circular Dichroism (CD) experiments suggested that isolated WW3 domain was not as stable as other WW domains and binding to U24 peptide enhanced its stability slightly. In Chapter 3, interactions between tandem Smurf2 WW23 and U24 peptide were studied. NMR studies demonstrated that the interaction between Smurf2 WW23 and U24 peptide mainly relied on the U24 peptide binding to its WW3 domain and that the WW2 domain played only a minor role in the interaction. CD experiments were also carried out to detect the stability of Smurf2 WW23 with and without U24 peptide.
Science, Faculty of
Chemistry, Department of
Graduate
4

Sang, Yurou. "Protein interactions of membrane protein U24 from Roseolovirus and implications for its function." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57213.

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This dissertation describes the investigation of the interactions between the tail-anchored membrane protein U24 from Human Herpesvirus type 6A (HHV-6A) and type 7 (HHV-7) and its potential binding partners. The roles that these interactions play in U24s’ function will be presented. It has been suggested that U24 from HHV-6A (U24-6A) may trigger an autoimmune reaction in multiple sclerosis (MS), through its molecular mimicry of myelin basic protein (MBP). Both versions of U24 have been implicated in endocytic recycling via specific binding partners, namely WW domains. The first part of this thesis is a review of the foundations that this thesis is based on, from the description of Roseoloviruses, associated diseases to molecular characterizations. The two main techniques used in the studies will be described as well. Prior to commencing any structural or interaction studies, a protocol is devised to express and purify recombinant U24 from HHV-7 (U24-7), as well as preliminary studies to prepare samples suitable for structure determination by nuclear magnetic resonance (NMR) spectroscopy. U24-6A was shown to be a mimic of MBP and it was suggested that it could be implicated in MS by competing with MBP for its interactions, such as the interactions with Fyn-SH3 domain. The interactions between U24-6A and Fyn-SH3 domain were therefore probed and found to be weak, calling into question this mimicry hypothesis. Because of the weak binding with Fyn-SH3 domain, alternative functions and binding partners were then explored. WW domains were chosen because their binding ligand, the PPxY (PY) motif, is present in U24 and was identified to be essential for U24’s function. In the next part of this thesis, the investigation of the interactions between U24s and WW domains in Nedd4, which is a key component required for endocytosis, are described. U24-7 and phosphorylated U24-6A were found to bind strongly to Nedd4-WW domains, suggesting the negative charge upstream from PY motif in U24 is important for high affinity interactions. Non-canonical Smurf2 WW domains were explored as well. Finally, the results presented in this thesis will be discussed in the context of the function of U24.
Science, Faculty of
Chemistry, Department of
Graduate
5

Tait, Andrew Robert. "Isolation and characterization of recombinant U24, a membrane protein from human herpesvirus type 6." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36585.

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This thesis describes the isolation and characterization of the U24 membrane protein encoded by Human Herpesvirus type-6 (HHV-6), obtained from an E. coli recombinant expression system. HHV-6 infection has been previously associated with the disease multiple sclerosis (MS), and the U24 protein is of interest because it has a seven amino-acid sequence (PRTPPPS) identical to myelin basic protein (MyBP), a candidate auto-antigen in MS. In the first part of this thesis, I describe the methods that were developed to enable milligram quantities of U24 to be isolated and purified from litre cultures of E. coli. Levels of U24 expressed with a maltose binding protein-hexahistidine fusion tag were particularly enhanced by combinations of low temperature, oxidizing conditions, and/or use of minimal media culture. The significance of these results may be considered useful in application to other difficult-to-obtain membrane proteins. Subsequent chapters of this thesis describe testing the recombinant U24 for potential mimicry of MyBP structure and function. Since the polyproline region in MyBP is now being recognized for its potential in cell-signalling roles that relate to myelin sheath development and structural integrity, I hypothesized that U24 may retain some of the same attributes as MyBP on the basis of identical sequence. Results here suggest that U24 can adopt a polyproline type II helix much like MyBP, which is a structural feature important for engaging in protein-protein interactions. Furthermore, the region is also found to represent a PX(T/S)P MAPK phosphorylation motif and PXXP-based Fyn tyrosine kinase SH3 binding domain. These observations are of particular relevance since phosphorylated MyBP is particularly decreased in MS patients, and Fyn is critical to myelin development. Like MyBP, results suggest that U24 can be phosphorylated at the equivalent threonine and is also able to bind to the Fyn-SH3 domain. These results support the possibility that U24 interferes with essential myelin regulation pathways on the basis of its sequence shared with MyBP, thereby contributing to a pathological process. I conclude with a presentation of preliminary NMR structural data for U24, as well as review results from a study of U24 in an animal model system. Future directions are also discussed.
6

Moore, Robert D. Jr. "A New Look at Hard Labor Creek Observatory." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/phy_astr_theses/15.

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This document presents a study of astronomical observing conditions of Hard Labor Creek Observatory. Analysis of factors such as sky brightness, astonomical seeing, and patterns in the level of cloudiness at the site are presented. Characteristics of the observatory's Apogee Alta U230 camera are also measured and calculated. These characteristics include loss of linearity in the CCD's response to light, read noise, gain, dark current, and stability in the camera's bias levels. The camera is also used in conjunction with the 20-inch RC Optics telescope to determine the system's pixel scale and a set of limiting magnitudes for the Johnson-Cousins photometric filters that are used with the camera. Observations of a transit of known transiting exoplanet Qatar-2 b as well as observations of the open cluster Messier 29 are also performed to demonstrate the ability of the equipment to perform precise photometric observations.
7

Santos, Rosana Nunes dos. "Implantação da Metodologia de Espectrometria Alfa para a Determinação de Isótopos de U E Th em Rochas Ígneas: Aplicação ao Estudo do Desequilíbrio Radioativo na Ilha da Trindade." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/14/14132/tde-21032006-121047/.

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Este trabalho descreve detalhadamente a implantação de rotinas experimentais para a determinação das atividades de 238U, 234U e 230Th pela técnica de espectrometria alfa. As melhores condições foram obtidas utilizando-se traçadores de 233U, 232U e 229Th, simulando algumas situações comumente encontradas no processamento de silicatos. A qualidade das determinações foi avaliada efetuando-se testes com os padrões geológicos brasileiros BB-1 (basalto) e GB-1 (granito). O processamento radioquímico consta das seguintes etapas: adição de traçadores radioativos e dissolução das amostras através de digestão ácida, pré-concentração de U e Th por co-precipitação, separação e purificação desses elementos por cromatografia de troca iônica e eletrodeposição em discos de aço inoxidável. Os rendimentos químicos para a determinação de urânio e tório, para ambos os padrões, são da ordem de 60% e 70%, respectivamente. Esta metodologia fornece resultados com elevados níveis de precisão (precisão relativa inferior a 4%) e de exatidão (da ordem de 1%), que são fundamentais para aplicações em estudos petrogenéticos. A espectrometria alfa, juntamente com os métodos de análise por ativação neutrônica e espectrometria gama natural, foram aplicados ao estudo do desequilíbrio radioativo nas rochas vulcânicas da Ilha da Trindade e em um fonólito de Martin Vaz. Com isso, foram determinadas as razões de atividades (234U/238U), (238U/232Th) e (230Th/232Th), como também as atividades dos nuclídeos 234Th, 214Pb, 214Bi, 235U, 228Ac, 212Pb, 212Bi e 208Tl. As análises químicas de elementos maiores e menores, obtidas por meio da técnica de fluorescência de raios X, auxiliaram na interpretação desses resultados. No estudo da série do 232Th, verificou-se que a condição de equilíbrio radioativo foi atingida, indicando que o sistema permaneceu fechado para todos os seus membros nos últimos 40 anos. As rochas mais antigas da ilha (Complexo Trindade e Seqüência Desejado) encontram-se em equilíbrio radioativo secular na série do 238U, conforme esperado. Por outro lado, os resultados da análise das rochas pertencentes aos três últimos episódios vulcânicos (Formação Morro Vermelho, Formação Valado e Vulcão do Paredão) ocorridos em Trindade, mostram que a série do 238U encontra-se em desequilíbrio radioativo entre 230Th e 238U. Além disso, as únicas 3 amostras da Formação Morro Vermelho analisadas por espectrometria gama mostraram desequilíbrio entre 226Ra e 238U. As determinações das razões de atividades (238U/232Th) e (230Th/232Th) permitiram estimar a idade da Formação Morro Vermelho em cerca de 140.000 anos. No caso de Martin Vaz, uma única amostra disponível (fonólito peralcalino) mostrou um forte desequilíbrio entre 226Ra e 238U, o qual foi interpretado como resultante de uma perda substancial de Ra, ocorrida no intervalo de 8.000 e 40 anos atrás.
This work describes the implementation of experimental procedures for alpha spectrometry measurement of 238U, 234U and 230Th activities in silicates. The best experimental conditions were defined using 233U, 232U and 229Th radioactive tracers and simulating the usual conditions found in processing silicates. The chemical procedures consists of the following steps: radioactive tracer addition and sample dissolution by acid digestion, U and Th pre-concentration by co-precipitation, element separation and purification by ion exchange chromatography and electrodeposition in inox steel disks. In order to evaluate its effectiveness, the procedure was applied to the Brazilian geological standards BB-1 (basalt) and GB-1 (granite). The obtained chemical yields for uranium and thorium are of about 60% and 70%, respectively, for both matrices. The described methodology furnishes activity measurements with less than 4% relative precisions and accuracies of about 1%, that are essential for petrogenetic applications. The 238U and 232Th series disequilibrium conditions were investigated by alpha spectrometry, together with neutron activation analysis and natural gamma-ray spectrometry. 234U/238U, 238U/232Th and 230Th/232Th activity ratios and the 234Th, 214Pb, 214Bi, 235U, 228Ac, 212Pb, 212Bi and 208Tl specific activities were obtained. These results were interpreted with the help of additional constraints given by the larger and smaller elements concentrations, measured by X-ray fluorescence. The 232Th series is in secular radioactive equilibrium in all analysed samples. In the case of the 238U series, the equilibrium condition was verified, as expected, in the oldest rocks from the Trindade Island (Trindade Complex and Desejado Sequence). On the other hand, the results show that, in the samples from the last three volcanic episodes in the island (Morro Vermelho Formation, Valado Formation and Vulcão do Paredão), the 230Th and 238U are not in equilibrium. Furthermore the three Morro Vermelho Formation samples analysed by gamma spectrometry showed the disequilibrium between 226Ra and 238U. The obtained (238U/232Th) and (230Th/232Th) activity ratios allowed to estimate a 140,000 y age for the Morro Vermelho Formation. In the case of the Martin Vaz sample (peralkaline phonolite) a strong disequilibrium between 226Ra and 238U was observed, suggesting a substantial loss of 226Ra between 8,000 y and 40 y ago.
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Haag, Nils-Holger [Verfasser], Lothar [Akademischer Betreuer] Oberauer, and Hubert [Akademischer Betreuer] Kroha. "Experimental Determination of the Antineutrino Spectrum of the Fission Products of U238 / Nils-Holger Haag. Gutachter: Lothar Oberauer ; Hubert Kroha. Betreuer: Lothar Oberauer." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1044073691/34.

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9

Schmalhofer, Alexander [Verfasser], Martin [Akademischer Betreuer] [Gutachter] Lames, Florian [Gutachter] Kainz, and Filip [Gutachter] Mess. "Perturbationsprofile im Nachwuchsleistungsfußball : Am Beispiel der U15-, U17-, U19- und U23-Mannschaft eines Bundesligisten / Alexander Schmalhofer. Betreuer: Martin Lames. Gutachter: Florian Kainz ; Martin Lames ; Filip Mess." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/110564684X/34.

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10

Murray, Elizabeth. "Measurement of prompt gamma-ray energy distribution and multiplicity of U-235 following thermal fission using STEFF." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/measurement-of-prompt-gammaray-energy-distribution-and-multiplicity-of-u235-following-thermal-fission-using-steff(237a3928-95a1-4a5f-b905-44ad23368f98).html.

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More accurate knowledge of gamma-ray heating in nuclear reactors has beenlisted as a high priority request by the NEA [23]. In response to this the SpecTrometerfor Exotic Fission Fragments (STEFF), a 2-velocity, 2-energy spectrometer assembledby the Manchester Fission Group has been used to take measurements ofprompt gamma-rays from thermal fission of U-235. Through the procedures discussed,the average total gamma-ray energy and average multiplicity were determined to be8.40 +/- 0.26 MeV and 7.74 +/- 0.12, respectively. The single energy spectrum for eachindividual detector has been determined as well as the total energy distribution. A new parallel plate avalanche counter has been tested for its potential to improvethe timing resolution of the current STEFF stop detector. The timing resolution ofthe new detector is found to be 337 ps, an improvement of 75 % on the previous stopdetector. The pulse shapes created by a fission fragment in an ionisation chamber havebeen investigated. The relationship with fragment atomic number has been tested byemploying the Lohengrin spectrometer to separate fragments by mass so that theirindividual pulse shapes can be studied. Evaluation work has been performed at the NNL, Cumbria, under the supervisionof Dr Robert Mills. Experimental data determined from the spontaneous fission ofCf-252 has been extracted and evaluation techniques performed upon it so that thedata can be considered for inclusion within an evaluated nuclear database.

Книги з теми "U234":

1

Scalia, Joseph M. Germany's last mission to Japan: The failed voyage of U-234. Annapolis, Md: Naval Institute Press, 2000.

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2

Hirschfeld, Wolfgang. Das letzte Boot: Atlantik farewell. München: Universitas, 1989.

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3

Watson, Glen Derek. Body and gut concentrations of Ra226 and U238 in limnephilid caddisfly harvae (trichoptera) from lakes influenced by uranium tailings near Elliot Lake, Ontario. Sudbury, Ont: Laurentian University Press, 1996.

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4

Bonin, Bernard, and Jean-Marc Cavedon. Moi, U235, atome radioactif. Flammarion, 2001.

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5

The World Market for Uranium and Its Compounds Enriched in U235; Plutonium and Its Compounds and Alloys; and Other Products Containing Enriched Uranium or Plutonium: A 2004 Global Trade Perspective. Icon Group International, Inc., 2005.

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6

Parker, Philip M. The World Market for Uranium and Its Compounds Enriched in U235; Plutonium and Its Compounds and Alloys; and Other Products Containing Enriched Uranium or Plutonium: A 2007 Global Trade Perspective. ICON Group International, Inc., 2006.

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7

Parker, Philip M. The World Market for Uranium and Its Compounds Depleted in U235; Thorium and Its Compounds and Alloys; and Other Products Containing Uranium Depleted in ... or Thorium: A 2007 Global Trade Perspective. ICON Group International, Inc., 2006.

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8

The World Market for Uranium and Its Compounds Depleted in U235; Thorium and Its Compounds and Alloys; and Other Products Containing Uranium Depleted in ... or Thorium: A 2004 Global Trade Perspective. Icon Group International, Inc., 2005.

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Частини книг з теми "U234":

1

Hoffmann, Klaus. "Der amerikanische Supersprengstoff U235." In Schuld und Verantwortung, 176–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-58030-7_13.

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2

Hoffmann, Klaus. "The American Super-Explosive U235." In Otto Hahn, 179–92. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-1-4613-0101-1_13.

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3

Pazirandeh, A., and Y. Ahmedi-zadeh. "Averaged U238 Fission Cross Section Measurement in Cf-252 Neutron Spectrum." In Nuclear Data for Science and Technology, 112–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-58113-7_33.

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4

GHIORSO, A., G. H. HIGGINS, A. E. LARSH, G. T. SEABORG, and S. G. THOMPSON. "Spontaneous Fission of U234, Pu236, Cm240, and Cm244." In World Scientific Series in 20th Century Chemistry, 440. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789812795953_0079.

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5

GHIORSO, A., J. W. BRITTAIN, W. M. MANNING, and G. T. SEABORG. "The Uranium Isotope U236." In World Scientific Series in 20th Century Chemistry, 118. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789812795953_0026.

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6

Gofman, J. W., and G. T. Seaborg. "PRODUCTION AND PROPERTIES OF U232 AND Pa232." In World Scientific Series in 20th Century Chemistry, 114–17. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789812795953_0025.

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7

SEABORG, G. T., J. W. GOFMAN, and R. W. STOUGHTON. "Nuclear Properties of U233: A New Fissionable Isotope of Uranium." In World Scientific Series in 20th Century Chemistry, 113. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789812795953_0024.

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8

HAGEMANN, F., L. I. KATZIN, M. H. STUDIER, A. GHIORSO, and G. T. SEABORG. "The (4n+1) Radioactive Series: The Decay Products of U233." In World Scientific Series in 20th Century Chemistry, 427. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789812795953_0072.

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9

FOREMAN, BRUCE M., WALTER M. GIBSON, RICHARD A. GLASS, and GLENN T. SEABORG. "Spallation-Fission Competition in Heavy-Element Reactions: Th232+He4 and U233+d." In World Scientific Series in 20th Century Chemistry, 539–49. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789812795953_0091.

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10

Kraus, Eric B., and Joost A. Businger. "Basic Concepts." In Atmosphere-Ocean Interaction. Oxford University Press, 1995. http://dx.doi.org/10.1093/oso/9780195066180.003.0005.

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Both Cartesian tensor and vector notation will be used in this text. The notation xi means the i-component of the vector x = (x1 x2, x3). When used in the argument of a function [e.g., f(xi)], xi, represents the whole vector, so that f(xi) stands for f(xl,x2,x3). Repeated indices indicate summations over all coordinate directions, (uiui = u2i = u21 + u22 + u23). Two special and frequently used tensors are the unit tensor δij and the alternating tensor ∊ijk. The unit tensor has components equal to unity for i = j and zero for i ≠ j. The alternating tensor has components equal to +1 when the indices are in cyclical sequence 1, 2, 3 or 2, 3, 1 or 3, 1,2; equal to -1 when the indices are not cyclical; and equal to zero when two indices are the same. The vorticity vector is defined by the relation The symbol = is used throughout to represent a definition or identity. Conditions near the sea surface are usually very anisotropic. It is often desirable to distinguish between the horizontal and vertical directions. We shall do so by using an x, y, z coordinate system with the origin at mean sea level and the z -axis pointing upward. Unless otherwise specified, the x and y directions will be toward east and north. The vertical velocity will be denoted by W; the horizontal velocity by the vector U with components U and V. Unity vectors in the x, y, z directions are denoted by i, j, k. The usual vector operation symbols will be used only to represent operations within the horizontal plane. For example, In a fluid one has to distinguish between local changes and changes that are experienced by an individual fluid element as it moves about. The former can be recorded by a fixed sensor and is represented by the partial time differential. The individual change could only be recorded by a sensor that would float with the element. It is denoted by the total time differential In a treatise that covers such a variety of topics, some use of the same symbols for different properties is inevitable.

Тези доповідей конференцій з теми "U234":

1

Shcherbakov, Oleg A. "Prefission and capture gamma-rays in neutron resonances of U235, U238 and Pu239." In The tenth international symposium on capture gamma-ray spectroscopyand related topics. AIP, 2000. http://dx.doi.org/10.1063/1.1361461.

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2

Venneri, Francesco, Yonghee Kim, Donald McEachern, Carl-Magnus Persson, and Chang-Keun Jo. "The Analysis of the Thorium-Fueled Modular Helium-Cooled Reactor." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58315.

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The potential of thorium fertile fuel has been evaluated for a graphite-moderated MHR (Modular Helium Reactor) from the perspective of a self-sustainable U233-Th fuel cycle in the MHR. The 3-D core analyses have been performed with the thermal-hydraulic-coupled computer code systems (HELIOS-MASTER). The feasibility of a self-sustainable U233-Th fuel cycle in MHR was evaluated for a simplified equilibrium fuel cycle. A mixed oxide fuel (ThO2-UO2) was used. Whole-core analysis was performed with the MASTER code for various core configurations. In the core analysis, a 3-batch radial fuel shuffling scheme was adopted to find an equilibrium fuel cycle. Three types of fuel blocks were considered: a homogeneous fuel arrangement and two seed-blanket arrangements. It was found that a near self-sustainable U233-Th fuel cycle (conversion ratio = 0.95∼0.97) is feasible for the MHRs with the appropriate U-233 and Th-232 loadings. To achieve a high conversion ratio while maintaining a long cycle length, it is essential to maximize the thorium loading (∼30 tons) and at the same time soften the neutron spectrum to achieve sufficient reactivity. In order to achieve conversion ratios over 0.95 and an 18-month cycle length, the moderator volume needs to be increased with respect to the regular MHR design. Also, removing the inner graphite reflectors increases noticeably the core performance in terms of the conversion ratio and cycle length. A special seed-blanket block configuration (ISB, with seed and blanket fuels in the inner and outer regions of a block, respectively) provides a superior conversion ratio with respect to a homogeneously fueled block, whereas reversing the placement of seed and blanket in the ISB block configuration (with seed fuels in the outer zone) results in a worse performance. In the case of the U233-Th fuel cycle, the fissile (U233+U235) fraction in the discharged fuel is almost 90%. Denaturing of the uranium vector in the self-sustainable U233-Th fuel was investigated by adding 10% LEU in the fuel, to make the initial fissile fraction ∼20.5%. Neutronic analysis of the operation with denatured fuel reveals that the conversion ratio is substantially reduced and the available cycle length is much shorter.
3

Hanke, Richard, Phaidra Campbell, Colin Lavassar, and John Sleavin. "Ground Improvements for Seattle's U230 U-Link Tunnel Construction." In Proceedings of the Fourth International Conference on Grouting and Deep Mixing. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412350.0069.

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4

Paulson, L. "K-Infinite Comparison of Uranium Compounds at 5 wt.% U235." In Tranactions - 2019 Winter Meeting. AMNS, 2019. http://dx.doi.org/10.13182/t31113.

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5

Kurniawan, Eri, Ruswan Dallyono, and Janriko Abdussalam Sadiq. "TV Football Commentary of Indonesia U23 Against South Korea U23 Match: An analysis of lexical and syntactic features." In Proceedings of the Eleventh Conference on Applied Linguistics (CONAPLIN 2018). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/conaplin-18.2019.120.

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6

Kurniawan, Eri, Ruswan Dallyono, and Janriko Abdussalam Sadiq. "TV Football Commentary of Indonesia U23 Against South Korea U23 Match: An analysis of lexical and syntactic features." In Proceedings of the Eleventh Conference on Applied Linguistics (CONAPLIN 2018). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/conaplin-18.2019.14.

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7

Kurniawan, Eri, Ruswan Dallyono, and Janriko Abdussalam Sadiq. "TV Football Commentary of Indonesia U23 Against South Korea U23 Match: An analysis of lexical and syntactic features." In Proceedings of the Eleventh Conference on Applied Linguistics (CONAPLIN 2018). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/conaplin-18.2019.228.

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8

Terrell, Charles W. "Advantages and Implications of U233 Fueled Thermionic Space Power Energy Conversion." In 27th Intersociety Energy Conversion Engineering Conference (1992). 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/929504.

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9

Svitak, Frantisek, Karel Svoboda, and Josef Podlaha. "Research Reactor Spent Nuclear Fuel Shipment From the Czech Republic to the Russian Federation." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16195.

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In May 2004, the Global Threat Reduction Initiative agreement was signed by the governments of the United States and the Russian Federation. The goal of this initiative is to minimize, in cooperation with the International Atomic Energy Agency (IAEA) in Vienna, the existing threat of misuse of nuclear and radioactive materials for terrorist purposes, particularly highly enriched uranium (HEU), fresh and spent nuclear fuel (SNF), and plutonium, which have been stored in a number of countries. Within the framework of the initiative, HEU materials and SNF from research reactors of Russian origin will be transported back to the Russian Federation for reprocessing/liquidation. The program is designated as the Russian Research Reactor Fuel Return (RRRFR) Program and is similar to the U.S. Foreign Research Reactor Spent Nuclear Fuel Acceptance Program, which is underway for nuclear materials of United States origin. These RRRFR activities are carried out under the responsibilities of the respective ministries (i.e., U.S. Department of Energy (DOE) and Russian Federation Rosatom). The Czech Republic and the Nuclear Research Institute Rez, plc (NRI) joined Global Threat Reduction Initiative in 2004. During NRI’s more than 50 years of existence, radioactive and nuclear materials had accumulated and had been safely stored on its grounds. In 1995, the Czech regulatory body, State Office for Nuclear Safety (SONS), instructed NRI that all ecological burdens from its past activities must be addressed and that the SNF from the research reactor LVR-15 had to be transported for reprocessing. At the end of November 2007, all these activities culminated with the unique shipment to the Russian Federation of 527 fuel assemblies of SNF type EK-10 (enrichment 10% U235) and IRT-M (enrichment 36% and 80% U235) and 657 irradiated fuel rods of EK-10 fuel, which were used in LVR-15 reactor.
10

Tomaškovič, Juraj, Petr Dařílek, Radoslav Zajac, and Vladimír Nečas. "Advanced Alternatives of VVER-440 Fuel Assembly." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-31108.

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The main goals of fuel development for pressurized water reactor are effectiveness and economic efficiency. Both requirements can be achieved by gradual increase of discharged fuel burn-up and prolongation of fuel cycle. The mentioned effects can be reached by optimisation of fuel assembly profiling, fuel enrichment raise, and by parasitic absorption reduction. These methods were used in VVER-440 fuel assembly optimisation, described in this paper. Fuel pin configurations with enrichment limit 5 % and also enlarged one up to 5.95 % U235 were designed. Reduction of parasitic absorption was limited by carcass frame of the assembly. Basic characteristics of the best assembly proposals are presented and effects on equilibrium fuel cycle of VVER-440 reactor are characterized.

Звіти організацій з теми "U234":

1

Moir, Ralph. U232 Nonproliferation Features. Office of Scientific and Technical Information (OSTI), June 2010. http://dx.doi.org/10.2172/1124839.

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2

Clark, D. U235: a gamma ray analysis code for uranium isotopic determination. Office of Scientific and Technical Information (OSTI), December 1997. http://dx.doi.org/10.2172/310887.

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3

Ziock, Klaus-Peter, J. B. Alameda, N. F. Brejnholt, T. A. Decker, M. A. Descalle, M. Fernandez-Perea, R. M. Hill, et al. Direct Measurement of U235 and Pu239 in Spent Fuel Rods with Gamma-Ray Mirrors. Office of Scientific and Technical Information (OSTI), September 2013. http://dx.doi.org/10.2172/1328266.

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