Дисертації з теми "Isotopies"
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Karlsson, Cecilia. "Area preserving isotopies of self transverseimmersions of S1 in R2." Thesis, Uppsala universitet, Matematiska institutionen, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-138921.
Повний текст джерелаKarlsson, Cecilia. "Smooth area preserving isotopies of self transverse immersions of S¹ into R²." Thesis, Uppsala universitet, Matematiska institutionen, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-112522.
Повний текст джерелаNibigira, Beatrice. "Vénus : isotopies animales dans les oeuvres poétiques de Charles Baudelaire et de Léopold Sédar Senghor /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Повний текст джерелаRolin, Jean-Philippe. "Géométrie intégrale et invariants d'isotopie." Dijon, 1985. http://www.theses.fr/1985DIJOS035.
Повний текст джерелаTécourt, Jean-Pierre. "Sur le calcul effectif de la topologie de courbes et surfaces implicites." Nice, 2005. http://www.theses.fr/2005NICE4057.
Повний текст джерелаIn this thesis, we got interested into the effective computation of the topology of implicit curves and surfaces. One can distinguish four different works: In a first part, we present an algorithm for computing the topology of a curve of R3 defined as the intersection of two implicit surfaces. More precisely, we compute a graph of points isotopic to the original curve. Then we detail a sweeping algorithm to compute an arrangement of quadrics based on a ``trapezoidal'' decomposition of the sweeping plane. The third part is devoted to an algorithm of triangulation of algebraic surfaces. This algorithm based on the computation of a Whitney stratification of the surface is the first one providing an isotopic meshing of the original surface even for singular surfaces. Finally, we study a family of parametrized surfaces, the Steiner surfaces, providing answers to the problems of effective classification, implicitization and search of preimages
Walsh, Mark. "Metrics of positive scalar curvature and generalised Morse functions /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2009. http://hdl.handle.net/1794/10265.
Повний текст джерелаMissire, Régis. "Sémantique des textes et modèle morphosémantique de l'interprétation." Toulouse 2, 2005. http://www.theses.fr/2005TOU20047.
Повний текст джерелаThe purpose is to contribute to the development of a morphosemantic model of interpretation for a textual semantics. We take interest in particular in the adequacy between the theory (Interpretative Semantics) and a model inspired by Gestalttheory and the Theory of Semantic Forms. To that end, we formulate several proposals :(i) Theoretical ones that aim, by restoring Interpretative Semantics within the scope of european structural semantics, and especially lexematics, at enhancing the adequacy between the structural and gestalt theories. (ii) Descriptive ones, within the scope of the morphosemantic model, focussing mainly on the " isotopy " concept and the question of temporalization of the interpretative paths (semantic rhythms). These proposals are supported by two analyses : the first one deals with a sonnet written by Baudelaire (Tristesses de la Lune), the second is about a corpus of 113 definitions produced by as many speakers to whom a text was submitted, text in wich a word was to be defined
Sanseverino, Giulio. "Le voci di Camus tra soggettività e ritraduzione." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/353462.
Повний текст джерелаCette étude envisage les retraductions littéraires comme les étapes d'un parcours où chaque manifestation textuelle est le résultat unique de la rencontre entre les nécessités historico-culturelles qui l'ont déterminée et la poétique de l'individu qui la prend en charge en tant que médiateur. Contre l'hypothèse de la retraduction avancée par Berman et Bensimon (1990), formalisée ensuite par Chesterman (2000) et préconisant une perspective logocentrique en dehors de l'expérience concrète de la retraduction - à savoir une progression à rebours vers la lettre du texte source - la ligne de recherche adoptée ici adhère à une idée moins déterministe de l'évaluation des séries de retraduction, afin d'étudier leurs inévitables différences internes, également dans un sens positif, à la lumière tant des nombreux facteurs qui les influencent que de l'herméneutique subjective de ceux qui les réalisent. La comparaison analytique menée entre la première et la deuxième traduction de L'Étranger (1942) et de La Peste (1947) d'Albert Camus permet ainsi de délimiter les profils de travail des quatre traducteurs en suivant deux lignes principales d'investigation : d'une part, elle vérifie les éventuelles divergences entre les déclarations paratextuelles respectives (trouvées dans les pré/postfaces, les notes de traduction, les essais, les entretiens, etc.) concernant la stratégie adoptée et les résultats du travail concret sur les textes ; d'autre part, elle examine l'inévitable manifestation en diachronie des normes de traduction opérant au moment de la traduction, mais à travers le filtre des voix individuelles qui se sont exprimées sous l'influence de différentes contraintes et à des moments distincts de la vie de ces textes, contribuant à leur longévité. Les résultats de l'analyse sont hétérogènes et non conformes à l'hypothèse de retraduction. La prédominance du littéralisme dans les premières traductions est difficilement conciliable avec l'effort d'acclimatation vers le lecteur cible que l'hypothèse attribuerait systématiquement aux premières traductions-introductions, bien que l'attitude assimilatrice se révèle dans le conformisme à certains impératifs culturels et éditoriaux de l'époque (italianisation onomastique ; tendance interponctive sous le signe de l'hypotaxe ; ennoblissement du lexique). En même temps, les deux retraductions, bien que dans un esprit très différent et bien qu'elles soient effectivement plus attentives aux particularités stylistiques de leurs proto-textes respectifs (comme le voudrait l'hypothèse), n'adoptent pas pour autant des procédés qui exhibent, sans motivation fondée, l'altérité du texte étranger, qu'elles tendent plutôt à naturaliser dans un sens phraséologique, sans pour autant le dénaturer. Si l'on peut parler d'amélioration en dehors de l'évolution des paramètres esthétiques entre les deux époques (fin des années 1940 et milieu des années 2010), il faut la reconnaître, le cas échéant, dans l'intégrité objectivement supérieure des retraductions en termes de complétude textuelle et de reproduction stylistique - étant donné que les premières ne manquent pas de transferts imprécis, incomplets ou incorrects dus à des calques structuraux ou lexicaux, des faux amis et des interprétations contraires au sens des énoncés. Par ailleurs, les améliorations sont sans doute à attribuer à la professionnalisation du métier et à la plus grande compétence des retraducteurs en tant que lecteurs modèles des textes abordés, qu'ils ont pu étudier grâce à une extraordinaire disponibilité d'outils critiques qui n'existaient pas à l'époque des premières traductions. Cela leur a permis de sonder les techniques narratives et les isotopies les plus significatives afin de les rendre dominantes dans leurs propres œuvres.
Juniati, Dwi. "De la régularité Lipschitz des espaces stratifiés." Aix-Marseille 1, 2002. http://www.theses.fr/2002AIX11006.
Повний текст джерелаNilsson, Lino. "Nitrogen transformations at the Kiruna mine : The use of stable nitrogen isotopes to trace nitrogen-transforming processes." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-209419.
Повний текст джерелаMoraga, Ferrándiz Carlos. "Contribution à une théorie de Morse-Novikov à paramètre." Nantes, 2012. http://www.theses.fr/2012NANT2045.
Повний текст джерелаThe framework of this study is a closed manifold of dimension at least six that is provided with a nonzero De Rham cohomology class. The aim is to create tools to address the next problem : two closed non-singular (without zeroes) 1-forms in the fixed class are always isotopic ? The general answer to the question is no, and a K-theoretical obstruction is expected. It is always possible to connect two non-singular closed 1-forms by a path that remains in the cohomology class ; the isotopy of the two ends of the path is equivalent to find a relative homotopy of the path to another one made of non-singular 1-forms only. We introduce two kinds of pseudo-gradients for each positive number L : those with an L-elementary link and those that we call L-transverse. They form a class of vector fields adapted to the 1-forms that allows to do an algebraic reading associated with the path. This reading is similar to that made in the theory of Hatcher-Wagoner who treated the isotopy problem of real-valued functions without critical points. We manage to find L, a number large enough to deform a path of 1-forms with only two critical indices into another one with an L-transverse equipment in normal form. The zeroes of such a path that are born together, die together and moreover, the associated Cerf-Novikov graphic is closed : the cited algebraic reading belongs to some K2, which is the starting point for the definition of an obstruction for two non-singular closed 1-forms to be isotopic
Sikorav, Jean-Claude. "Points fixes de difféomorphismes symplectiques, intersections de sous-variétés lagrangiennes, et singularités de un-formes fermées." Paris 11, 1987. http://www.theses.fr/1987PA112119.
Повний текст джерелаThis thesis consists of four distinct parts. In the first part, we give a proof of the Arnold conjecture for surfaces and a generalisation to some other symplectic manifolds, using the varational approach introduced by Conley and Zehnder for tori. In the second part, we show that the zero-section MC T*M, the cotangent bundle, can never be disconnected from itself by a Hamiltonian isotopy, and give a lower bound for the number of intersection points; the proof, which is elementary, uses generating functions for Lagrangian submonifolds. As an application, we give a much simpler proof of the Arnold conjecture. In the third part, we extend the problem studied in the second part to symplectic isotopies, using results on the Novikov homology associated to a cohomology class of degree one; in particular, we show that if disconnection is possible with dimM≥ 6 et π1M Z, then M carries a nonsingular closed one-form, and thus fibers over s1. In the fourth part, we study some properties of the Novikov homology, and prove the same result as in the third part for irreducible manifolds of dimension three
Yin, Nang Htay. "Weathering of metallurgical slags : a comprehensive study on the importance of chemical and biological contributions." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1125/document.
Повний текст джерелаPrimary smelting slags, known as Lead Blast Furnace (LBF) and Imperial Smelting Furnace (ISF), were generated by the former pyrometallurgical industries located in Noyelles-Godault, Northern France. Following its closure in 2003, 4 million tons of primary slags have been landfilled as a heap in the vicinity of the Deûle River, near the industrial basin of Nord-Pas-de-Calais. These slag materials are often enriched in particular metals (Pb, Zn) that can be released into the environment through alteration processes and leaching. Many biological and chemical processes might take place within these tailings and thus affect significantly the slag weathering. Predicting the environmental impact of these wastes requires an understanding of the mineral-water interactions as well as the influence of the biological activities (the involvement of microorganisms). Thus, this research is designed to simulate the natural weathering of slag by simulating different weathering conditions with or without the involvement of the microorganisms as well as by varying several chemical parameters. Chemical weathering of both LBF and ISF slags was studied by as a function of pHs (4, 5.5, 7, 8.5 and 10) as well as under two atmospheres (open air and nitrogen). Significant amounts of Ca, Fe and Zn were released under acidic conditions (pH 4) with a decrease towards the neutral to alkaline conditions (pH 7 and 10) for both slags. The concentrations of all elements increased gradually after 216 h compared to initial 24 h of leaching period. The presence of oxygen under open-air atmosphere not only enhanced oxidative weathering but also encouraged formation of secondary oxide and carbonate phases. In addition, Zn dissolution was related to extremes zinc isotopic signatures in the leachate; heavier δ66Zn values at low pH than at high pH for both slags under open-air atmosphere. On the other hand, bioweathering of both slags was studied in the presence of a pure heterotrophic bacterial strain (Pseudomonas aeruginosa) in a bioreactor operated in batch conditon as well as in a semi-flow through reactor with intermittent leachate renewal conditions. P. aeruginosa is shown to play a significant role in slags weathering by enhancing the leaching and solubility of Zn and Pb. In addition, the cumulative bulk release of dissolved Fe, Si, Ca and Mg doubled in the presence of bacteria, probably due to the release of soluble complexing organic molecules (e.g. siderophores). Bacterial biomass served as the bioadsorbent for Pb, Fe and Zn as 70-80% of Pb and Fe, 40-60% of Zn released are attached to and immobilized by the bacterial biomass. Oxides, hydroxides and carbonates were predicted as secondary phases during chemical weathering of slags whereas carbonates and phosphates were dominant phases during bioweathering. These predictions were in agreement with the observations by Scanning Electron Microscopy (SEM) with Energy Dispersive X-Ray Analysis (EDS), Transmission Electron Microscopy (TEM) analysis, and X-ray Photoelectron Spectroscopy (XPS) analysis
Vaiglova, Petra. "Neolithic agricultural management in the Eastern Mediterranean : new insight from a multi-isotope approach." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:c8824136-da35-43b2-a700-f458d0cc2fdf.
Повний текст джерелаPetitat, Manuel. "Cr isotopes in carbonaceous chondrites : 53Mn-53Cr systematics and Cr isotopic anomalies." Paris, Muséum national d'histoire naturelle, 2010. http://www.theses.fr/2010MNHN0017.
Повний текст джерелаThis thesis has 2 distinct parts. In part I, the 53Mn-53Cr systematics was developed on a NanoSIMS and a CAMECA IMS 1270 to date the formation of carbonates in Orgueil, Alais, Boriskino and Kaidun. For each grain, the 53Cr excesses measured linearly correlated with their respective 55Mn/52Cr ratios, indicating the in-situ decay of 53Mn and showing that 53Mn was still extent at the time of formation of the respective carbonate. In part II, fragments of Tagish Lake and of Orgueil were dissolved in 5 different steps by using reagents with increasing acid strength to identify the different mineral phases carrying the Cr anomalies. Our results show that Tagish Lake displays both the highest excess and the highest deficit in 54Cr relative to a terrestrial standard of all groups of carbonaceous chondrite meteorites. This makes this meteorite one of the least metamorphic meteorite present in the collections worldwide and a particular target for deciphering the carrier phase of the 54Cr anomaly
Móri, Cleusa [UNESP]. "Rastreabilidade de farinhas de origem animal em tecidos de codornas de corte pela técnica dos isótopos estáveis de carbono ('intpot.13C'/'intpot.12C') e nitrogênio ('intpot.15N'/'intpot.14N')." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/104988.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Universidade Estadual Paulista (UNESP)
Estudos para detecção de subprodutos de origem animal em carne de aves são escassos e, em se tratando de codornas são inexistentes. O trabalho teve por objetivo a detecção de farinha de vísceras de aves (FVA) em dietas de codornas de corte no músculo peitoral quilha e tíbia pela técnica dos isótopos estáveis de carbono (13C/12C) e nitrogênio (15N/14N). Foram utilizadas 64 codornas de corte macho de um dia de idade advindas de granja comercial. As aves foram divididas em sete grupos distintos distribuídos aleatoriamente em relação às dietas experimentais que continham diferentes percentagens de FVA: 0; 1,5; 3,0; 4,5; 6,0; 7,5 e 15. As dietas foram formuladas de forma a serem isoenergéticas, isoprotéicas e isoaminoacídicas. Quatro aves de cada tratamento foram abatidas aos 42 dias de idade para colheita do músculo peitoral (Pectoralis major), quilha e tíbia para posteriormente serem analisadas. Observou-se enriquecimento isotópico de d13C e d15N nos três tecidos analisados. Em codornas de corte com 42 dias de idade, o nível de inclusão de farinha de vísceras de aves detectado compreende o intervalo de 3,0 a 4,5%.
Detection of animal origin by-products studies in poultry meat are rare and inexistent when related to quail meat. This paper aims the detection of increasing levels of poultry visceral meal (FVA) in quail meat, using carbon (13C/12C) and nitrogen (15N/14N) stable isotopes technique. Sixty four male quails aging one day originally from a commercial producer were divided in seven different groups in a random distribution. Those groups received different experimental diets containing 0; 1,5; 3,0; 4,5; 6,0; 7,5 e 15% of FVA. Those diets were formulated to be isoenergetic, isoproteic and to have the same level of amino-acids. Four individuals per treatment were sacrificed at the 42nd day for breast muscle (Pectoralis major), keel and tibia collection to later analysis. Isotopic enrichment of d13C and d15N were observed in all analyzed tissues. In 42 day old quail were detect a 3,0 and 4,5% poultry visceral meal inclusion in its diet.
Móri, Cleusa 1974. "Rastreabilidade de farinhas de origem animal em tecidos de codornas de corte pela técnica dos isótopos estáveis de carbono ('intpot.13C'/'intpot.12C') e nitrogênio ('intpot.15N'/'intpot.14N') /." Botucatu : [s.n.], 2007. http://hdl.handle.net/11449/104988.
Повний текст джерелаBanca: Ricardo de Albuquerque
Banca: Carla Cachoni Pizzolante
Banca: Carlos Ducatti
Banca: Ariel Antonio Mendes
Resumo: Estudos para detecção de subprodutos de origem animal em carne de aves são escassos e, em se tratando de codornas são inexistentes. O trabalho teve por objetivo a detecção de farinha de vísceras de aves (FVA) em dietas de codornas de corte no músculo peitoral quilha e tíbia pela técnica dos isótopos estáveis de carbono (13C/12C) e nitrogênio (15N/14N). Foram utilizadas 64 codornas de corte macho de um dia de idade advindas de granja comercial. As aves foram divididas em sete grupos distintos distribuídos aleatoriamente em relação às dietas experimentais que continham diferentes percentagens de FVA: 0; 1,5; 3,0; 4,5; 6,0; 7,5 e 15. As dietas foram formuladas de forma a serem isoenergéticas, isoprotéicas e isoaminoacídicas. Quatro aves de cada tratamento foram abatidas aos 42 dias de idade para colheita do músculo peitoral (Pectoralis major), quilha e tíbia para posteriormente serem analisadas. Observou-se enriquecimento isotópico de d13C e d15N nos três tecidos analisados. Em codornas de corte com 42 dias de idade, o nível de inclusão de farinha de vísceras de aves detectado compreende o intervalo de 3,0 a 4,5%.
Abstract: Detection of animal origin by-products studies in poultry meat are rare and inexistent when related to quail meat. This paper aims the detection of increasing levels of poultry visceral meal (FVA) in quail meat, using carbon (13C/12C) and nitrogen (15N/14N) stable isotopes technique. Sixty four male quails aging one day originally from a commercial producer were divided in seven different groups in a random distribution. Those groups received different experimental diets containing 0; 1,5; 3,0; 4,5; 6,0; 7,5 e 15% of FVA. Those diets were formulated to be isoenergetic, isoproteic and to have the same level of amino-acids. Four individuals per treatment were sacrificed at the 42nd day for breast muscle (Pectoralis major), keel and tibia collection to later analysis. Isotopic enrichment of d13C and d15N were observed in all analyzed tissues. In 42 day old quail were detect a 3,0 and 4,5% poultry visceral meal inclusion in its diet.
Doutor
Laprevotte, Hélène. "Du spirituel dans l'art verbal à la lumière d'un verbe-fée : une lecture de l'œuvre de Malcolm de Chazal, à la lumière de la rencontre des isotopies /religion/ et /langage/ dans Sens-Plastique." Paris 4, 1998. http://www.theses.fr/1998PA040044.
Повний текст джерелаThis analysis examines the relationship between art and spirituality through the juxtaposition of religious and verbal references in Malcolm de Chazal's works. Starting from obvious denotations, I then move onto more subtle connotations. The first part of my dissertation analyses the Mauritius context in which Malcolm de Chazal has composed his works. This section offers a detailed study of two types of corpus; a long one (3/4 of Chazal's works) and a shorter one, Sens-plastique, which has been the subject of serial analysis. My second and third chapters classify the numerous subisotopes from the religious/and/language isotopes, which reveal a metaphorical use of language. My point is that the two isotopes appear on both sides: that which compares and that which is compared. The fourth part shows the intrication of these two isotopes within the construction of Chazal's work itself. It assesses the many surrounding isotopes, especially the recurrent one of the /human body/. This part reveals more specifically the variety of metaphorical forms within Sens-plastique. The union of metaphors and antonomasias, antanaclases and syllepses put the 'signified' into motion, notably where god is signified. Language and the religious are placed within the natural order, which, in the process, becomes more human. Three "stylemes" organize the semiotic structure of the text: the relation one/multiple, the reversibility and tension between sacred/profane. I draw links between poetic language ('plasticisation') and constructions of meanings within the performative language used by de Chazal. In the light of the surrealist concept of "merveilleux" and the Buddhist notion of ku, I analyze the heuristic of Chazal's word which sends the reader back to his own relationships with the vibrant potentialities of the world. The metaphor, of which the flower is itself the metaphor, is, at the same time, the place and the model of the art and the religious, that is seen as a way to go beyond any limits. Mimicking life's dynamics, it serves a form of 'cosmic' humanism
Dubeau, Jacques. "Isotope shift measurements of the stable krypton isotopes in natural and enriched concentrations." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66154.
Повний текст джерелаPellereau, Éric. "Contribution à la mise en place, à la réalisation, et à l'analyse des données de rendements de fission issues de l'expérience SOFIA au GSI." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112323/document.
Повний текст джерелаThe isotopic fission yields of U 238 following the SOFIA experiment, conducted at the GSI facility (Darmstadt), are presented here. This experiment takes advantage of the inverse kinematics technique at relativistic energies. Benefits are several : fission fragments are highly focused (high geometrical efficiency) and are also completely stripped, which greatly simplifies their nuclear charge measurement. The first detector of the SOFIA setup is an active target in which fission occurs via electromagnetic excitation, followed by an ionization chamber to measure the nuclear charge and the horizontal angle of both fission fragments. The masses are deduced by the bending radius measurement of the fragments, deflected by a strong magnet (ALADIN), thanks to two position detectors (MWPC), and also by a highly resolved time-of-flight measurement (40 ps FWHM) so that heavy neighboring isotopes can be separated. The data analysis shows that the main goals are achieved since the isotopic separation is reached over the whole range of the fission fragments. A strong even-odd effect is seen in the charge spectrum, which also exhibits a mean heavy charge close to Z = 54. Surprisingly, the neutron even-odd effect of the light region is seen to be very close to the one in thermal neutron induced fission. The peak-to-valley ratio of the mass spectrum confirms that the mean excitation energy at fission is close to the expected one (14 MeV). The GEF code is used for comparison and always gives results very close to ours
Kastberg-Sjöblom, Margareta. "L'écriture de J. M. G. Le Clézio : une approche lexicométrique." Nice, 2002. http://www.theses.fr/2002NICE2008.
Повний текст джерелаSuzuki, Rafael Massami. "Aminoácidos marcados aplicados aos estudos de nutrição e fisiologia em frangos de corte /." Jaboticabal, 2019. http://hdl.handle.net/11449/191289.
Повний текст джерелаResumo: RESUMO: A evolução das análises, considerando especificamente a nutrição e fisiologia de frangos de corte, permitiram rastrear nutrientes a níveis nucleares, permitindo que novas metodologias fossem desenvolvidas e novos objetivos alcançados. Algumas das análises que merecem destaque considerando estudos voltados a exigências de aminoácidos e metabolismo proteico foram: determinação de nitrogênio total/proteína, análise da composição aminoacídica e análise isotópica, sendo que a associação destas análises permite um potencial ainda maior. O uso de compostos enriquecidos é uma excelente ferramenta para estudos fisiológicos, uma vez que as respostas obtidas são inerentes ao composto de interesse, sendo possível o rastreamento do isótopo. Contudo, esta tecnologia ainda apresenta um alto custo, parte devido à baixa produção destes produtos e devido o sigilo da tecnologia da produção de tais compostos. Deste modo, no capítulo 2 foi padronizado uma metodologia para avaliar a adição de aminoácido marcado na dieta de aves e sua incorporação nos tecidos. A seguir, no capítulo 3 é apresentado um estudo com o objetivo de fracionar a utilização dos aminoácidos sulfurados com a utilização de metionina e cistina marcadas, avaliando-se diferentes proporções de ambos aminoácidos e diferentes fontes de metionina. Por fim, no capitulo 4 foi avaliado o efeito da idade sob a incorporação da L-(15N) treonina em diferentes tecidos de frangos de corte. Portanto, os objetivos desta tese foram a padr... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: ABSTRACT: The evolution of the analyzes, specifically regarding nutrition and physiology of broiler chickens, allowed to track nutrients to nuclear levels, resulting in the development of new methodologies and new objectives were achieved. Some of the analyzes that deserve to be highlighted considering amino acid requirements and protein metabolism studies were: total nitrogen/protein determination, amino acid composition analysis and isotopic analysis, and the association of these analyzes allows an even greater potential. The use of enriched compounds is an excellent tool for physiological studies, since the responses obtained are inherent to the compound of interest, and it is possible to track the tracer. However, the cost of such technology is still high, partly due to the low production of these products and also due to the secrecy of the technology of the production of such compounds. Thus, in chapter 2, a methodology was standardized in order to evaluate the addition of labeled amino acid in the broiler diet and its incorporation into tissues. In addition, chapter 3 presents a study in order to fractionate the use of sulfur amino acids using labeled methionine and cystine, and evaluating different proportions of both amino acids and different sources of methionine. Finally, in chapter 4, the effect of age on the incorporation of L-(15N) threonine into different broiler tissues was evaluated. Therefore, the objectives of this thesis were the standardization and applica... (Complete abstract click electronic access below)
Doutor
Swift, Benjamin. "The use of radio-isotopes in forensic science : the development of the isotope fingerprint analysis." Thesis, University of Leicester, 2004. http://hdl.handle.net/2381/29475.
Повний текст джерелаHuckle, David Martyn. "Characterizing U-series Isotope Signatures in Soils and Headwater Streams in a Complex Volcanic Terrain: Jemez River Critical Zone Observatory, Valles Caldera, NM." Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/305863.
Повний текст джерелаCosta, Gelcirene de Albuquerque [UNESP]. "Rastreabilidade de camarão amazônico proveniente de cultivo e ambiente natural utilizando a técnica de isótopos estáveis." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/86669.
Повний текст джерелаA globalização no comércio de pescado tem aumentado à oferta do produto, mas tem favorecido a prática de fraudes, como por exemplo, a substituição de espécies nobres por espécies de menor valor comercial. Por outro lado, consumidores cada vez mais exigentes têm demonstrado preferências por produtos de sistemas agroalimentares diferenciados. No Brasil, a regulamentação para as indicações geográficas tem crescido em ritmo acelerado nos últimos dois anos, exigindo o desenvolvimento de ferramentas analíticas para comprovação dos atributos de qualidades destes produtos diferenciados. Neste trabalho foi verificada a eficiência das análises de composição química (carne) e isótopos estáveis de carbono e nitrogênio (carne e carapaça) como ferramentas para autenticação e rastreabilidade do camarão da Amazônia. Foram analisados camarões de ambiente natural provenientes de lagos do Amazonas (Rei e Catalão); Lagoa Bahiazinha, Pantanal de Miranda, MS; Ilhas próximas ao estuário no Pará. As amostras de camarão cultivado foram coletadas no CAUNESP, Jaboticabal, São Paulo. Amostras do Lago Rei foram coletadas em julho e dezembro para avaliar o efeito sazonal nos componentes analíticos. Os resultados mostraram que a análise fatorial exploratória (AFE) permitiu diferenciar camarões em função da origem geográfica e modo de produção tanto para a composição de isótopos estáveis como para composição química
Globalization and increasing international trade in fish and fisheries products, but has favored the practice of fraud, such as the replacement of noble species by species of lower commercial value. Furthermore, consumers are demanding have demonstrated preference for agrifood systems. In Brazil, the rules for geographical indications has grown at a fast pace in the past two years, requiring the development of analytical tools to prove the attributes of these qualities differentiated products. This study evaluated the efficiency of chemical composition analyzes (meat) and stable isotopes of carbon and nitrogen analyzes (meat and shells) as tools for authentication and traceability of Amazon River prawn. Prawns of natural environment came of the Amazonas from lakes (Rei and Catalão); Bahiazinha pond, Pantanal of Miranda, MS; Islands near the estuary on Para state. Farmed prawn samples were collected in CAUNESP, Jaboticabal, São Paulo. Samples were collected from Lake Rei in July and December to evaluate the seasonal effect in the analytical components. The results showed that the exploratory factor analysis (EFA) allowed differentiation shrimp depending on geographical origin and method of production for both the composition of stable isotopes as chemical composition
Costa, Gelcirene de Albuquerque. "Rastreabilidade de camarão amazônico proveniente de cultivo e ambiente natural utilizando a técnica de isótopos estáveis /." Jaboticabal, 2013. http://hdl.handle.net/11449/86669.
Повний текст джерелаBanca: Juliana Célia Denadai
Banca: Maria Márcia Pereira Sartori
Resumo: A globalização no comércio de pescado tem aumentado à oferta do produto, mas tem favorecido a prática de fraudes, como por exemplo, a substituição de espécies nobres por espécies de menor valor comercial. Por outro lado, consumidores cada vez mais exigentes têm demonstrado preferências por produtos de sistemas agroalimentares diferenciados. No Brasil, a regulamentação para as indicações geográficas tem crescido em ritmo acelerado nos últimos dois anos, exigindo o desenvolvimento de ferramentas analíticas para comprovação dos atributos de qualidades destes produtos diferenciados. Neste trabalho foi verificada a eficiência das análises de composição química (carne) e isótopos estáveis de carbono e nitrogênio (carne e carapaça) como ferramentas para autenticação e rastreabilidade do camarão da Amazônia. Foram analisados camarões de ambiente natural provenientes de lagos do Amazonas (Rei e Catalão); Lagoa Bahiazinha, Pantanal de Miranda, MS; Ilhas próximas ao estuário no Pará. As amostras de camarão cultivado foram coletadas no CAUNESP, Jaboticabal, São Paulo. Amostras do Lago Rei foram coletadas em julho e dezembro para avaliar o efeito sazonal nos componentes analíticos. Os resultados mostraram que a análise fatorial exploratória (AFE) permitiu diferenciar camarões em função da origem geográfica e modo de produção tanto para a composição de isótopos estáveis como para composição química
Abstract: Globalization and increasing international trade in fish and fisheries products, but has favored the practice of fraud, such as the replacement of noble species by species of lower commercial value. Furthermore, consumers are demanding have demonstrated preference for agrifood systems. In Brazil, the rules for geographical indications has grown at a fast pace in the past two years, requiring the development of analytical tools to prove the attributes of these qualities differentiated products. This study evaluated the efficiency of chemical composition analyzes (meat) and stable isotopes of carbon and nitrogen analyzes (meat and shells) as tools for authentication and traceability of Amazon River prawn. Prawns of natural environment came of the Amazonas from lakes (Rei and Catalão); Bahiazinha pond, Pantanal of Miranda, MS; Islands near the estuary on Para state. Farmed prawn samples were collected in CAUNESP, Jaboticabal, São Paulo. Samples were collected from Lake Rei in July and December to evaluate the seasonal effect in the analytical components. The results showed that the exploratory factor analysis (EFA) allowed differentiation shrimp depending on geographical origin and method of production for both the composition of stable isotopes as chemical composition
Mestre
Hidri, Abderrazak. "L’évolution du personnage romanesque chez Abd al-Rahman Munif." Thesis, Paris 3, 2010. http://www.theses.fr/2010PA030011.
Повний текст джерелаThis dissertation deals with the evolution of the characters in the novels of Abd al-Rahman Munif based on a semiotic methodology. This is done according to four research lines : first the isotopies, names connotation and portraits of characters. Second their relationships with space and time. Third the narrative construction of the jail text. Finally the ideology and the system of values in both texts
Bordinhon, André Moreira [UNESP]. "Autobalanceamento da energia e da proteína da dieta pela tilápia do Nilo por meio de isótopos estáveis de carbono e do consumo de matéria seca." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/104115.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Universidade Estadual Paulista (UNESP)
O objetivo deste trabalho foi avaliar a capacidade da tilápia do Nilo em 5 balancear sua dieta, quando fornecidas duas misturas de ingredientes, utilizando os 6 isótopos estáveis de carbono. Foram utilizados 225 juvenis de tilápia (peso: 5,0 ± 0,5 g), 7 distribuídos em cinco tanques. Os indivíduos alocados em um dos tanques eram 8 alimentados com uma mistura de alta proteína (MAP; δ13C = -22,62‰), os alocados em 9 um segundo tanque eram alimentados com uma mistura de baixa proteína (MBP; δ13C = 10 -14,34‰) e os animais dos outros tanques tinham acesso livre a ambas, quatro vezes ao 11 dia. Foram realizadas coletas de músculo, fígado e sangue a cada cinco dias por 86 dias, 12 exceto para o grupo alimentado com MBP (alimentado por 120 dias). As amostras 13 foram analisadas em espectrômetro de massa e as proporções consumidas das misturas 14 foram estimadas a partir do enriquecimento isotópico do carbono (δ13C). O 15 balanceamento realizado indicou redução no consumo relativo de proteína. Contudo, 16 esta relação não apresentou padrão definido em relação ao peso dos indivíduos, ou seja: 17 o balanceamento de proteína e energia para tilápia do Nilo está relacionado 18 principalmente à idade dos animais e não é claro se este processo está relacionado 19 também ao seu peso. As estimativas de consumo de um grupo animais desta espécie por 20 meio dos isótopos estáveis de carbono são semelhantes aos obtidos por outras técnicas, 21 portanto este método permite observação da diversidade deste comportamento no 22 autobalanceamento entre os indivíduos que compõe tal grupo.
This study aimed to assess the Nile tilapia ability to balance its own diet, 6 when two ingredient mixes were offered, using carbon stable isotopes. In order to 7 accomplish that, 225 Nile tilapia juveniles (average initial weight 5.0g ± 0.5g) were 8 distributed in five tanks, each containing a group of 45 fish. One group of fish were fed 9 exclusively a high protein mix (HPM; δ13C = -22.62‰), a second one fed only a low 10 protein mix (LPM; δ13C = -14.34‰). The other groups had free access to both mixes 11 (free choice system). The fish from all tanks were fed four times a day. Muscle, liver 12 and blood samples were collected at each five days (from 2 fish/tank/collection) for 86 13 days, except for the fish fed with MBP (fed for a 120 days period). The samples were 14 analyzed in a mass spectrometer and proportions of the mixes consumed were estimated 15 through its carbon isotope enrichment (δ13C). The fish diminished their protein intake 16 along the time. However, consumption did not present a clear pattern in relation to the 17 individual weight, i.e.: protein consumption patterns are mainly related to the age of the 18 individuals and it is not clear if it is also correlated to their weight. The consumption 19 estimative through stable isotopes of carbon did not conflict other studies reported in the 20 literature. Additionally this technique allowed observation of consumption among the 21 individuals from an experimental group 22.
Bueno, Juliana Finoto. "Geoquimica e cronologia de alojamento de granitos colisionais na Faixa Sergipana, Nordeste do Brasil." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287312.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Geociencias
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Resumo: A Faixa Sergipana é uma das mais significantes faixas móveis neoproterozóicas do nordeste do Brasil, porque ela contém diversas estruturas e domínios litológicos que permitem que ela seja comparada a orógenos fanerozóicos como os Himalaias, por exemplo. A Faixa Sergipana foi formada durante a colisão entre o Cráton São Francisco-Congo e o Maciço Pernambuco-Alagoas durante a orogênese Brasiliano/Pan-Africano é formada por cinco domínios litoestruturais (Canindé, Poço Redondo-Marancó, Macururé, Vaza Barris e Estância) e é um orógeno chave para a reconstrução de parte da história do Gondwana Oeste. São reconhecidos três eventos de deformação principais (D1-D3) nas rochas supracrustais da Faixa Sergipana, sendo que o evento D2 é o principal evento colisional na faixa e associado a ele tem-se a geração de grande parte dos granitos presentes nos domínios Macururé e Poço Redondo-Marancó. Os granitos presentes nestes domínios foram divididos em dois grupos principais: (1) os granitos com ~ 625 Ma compostos pelos: (i) granitos com características de arco no Domínio Poço Redondo-Marancó (Granodiorito Queimada Grande) e no Domínio Macururé (Tonalito Camará e Granodiorito Coronel João Sá) e (ii) granitos com características crustais do Domínio Poço Redondo- Marancó (granitos Sítios Novos e Poço Redondo) e (2) os granitos colisionais do Domínio Macururé de ~ 580 Ma. Os granitos Queimada Grande, Camará e Coronel João Sá são plutons de alto potássio, cálcioalcalinos, metaluminosos, magnesianos, tipo-I de arco vulcânico. Estes granitos foram originados por fusão parcial de rochas derivadas do manto ou de crosta inferior de composição basáltica com proporções variáveis de contaminação com crosta continental. Os granitos Sítios Novos e Poço Redondo foram gerados pela fusão dos migmatitos locais e os granitos colisionais do Domínio Macururé por alta taxa de fusão dos micaxistos encaixantes. A abundância de granitos colisionais no Domínio Macururé indica que este domínio pode ter funcionado como um conduto dúctil, durante o neoproterozóico, limitado por zonas de cisalhamento regionais. Para delimitar a duração da colisão que resultou na formação da Faixa Sergipana foi utilizada a idade obtida para o Tonalito Camará pré- D2 de 628±12 Ma, que marca a idade máxima para o início do evento D2, e a idade do Granito Pedra Furada sin a tardi- D2 de 571±9 Ma, que marca a idade mínima para o final do evento D2; utilizando estes dados tem-se que o principal evento colisional (D2) na Faixa Sergipana durou pelo menos 57 Ma. Os granitos Queimada Grande, Camará e Coronel João Sá são o registro de arco continental na Faixa Sergipana formado durante a colisão neoproterozóica e a sua presença indica que o Domínio Macururé estava conectado ao Domínio Poço Redondo-Marancó antes do início da orogênese Brasiliana.
Abstract: The Sergipano Belt is one of the most significant Precambrian orogenic belts of Northeastern Brazil because it contains several structural and lithologic domains that allow it to be compared with Phanaerozoic orogens, like Himalayas. The Sergipano Belt was formed through continental collision between the Congo- São Francisco Craton and the Pernambuco-Alagoas Massif during the Brasiliano/Pan-African Orogeny and it comprises five lithostructural domains: Canindé, Poço Redondo-Marancó, Macururé, Vaza Barris and Estância and it is a key belt for reconstructing part of the history of West Gondwana. Three main events of regional deformation (D1-D3) are recognized in the supracrustal rocks of the belt and the D2 event is the main collision event in the belt, most granites were emplaced during this event in the Macururé and Poço Redondo-Marancó domains. Granites found in these domains can be divided into two groups: (1) ~ 625 Maold granites formed by: (i) arc-type granites in the Poço Redondo-Marancó domain (Queimada Grande Granodiorite) and in the Macururé Domain (Camará tonalite and Coronel João Sá granodiorite) and (ii) crustal granites in the Poço Redondo-Marancó domain (Sítios Novos and Poço Redondo granites) and (2) ~ 580 Ma-old collision-related granites in the Macururé domain. The Queimada Grande, Camará and Coronel João Sá granites are plutons of high-K calc-alkaline, metaluminous, magnesian, I-type volcanic arc granites. These granites were originated by partial melting of basic crustal sources derived from mantle or lower crust of basaltic composition with variable ratios of continental crust contamination. The Poço Redondo and Sítios Novos granites were generated by partial melting of local migmatites and the collisional granites of the Macururé domain by high degree of partial melting of the Macururé micaschists. The abundance of collisional granites in the Macururé domain indicates that this domain acted as a ductile channel flow during the Neoproterozoic limited by regional. To delimit the collision duration that results in the formation of Sergipano belt was used the 628±12 Ma age obtained for the pre-D2 Camará Tonalite, which mark the maximum age for beginning of D2 event, and the 571±9 Ma age obtained for the syn- to tardi- D2 Pedra Furada granite that mark the minimum age for end of the D2 event; using these numbers without the associated errors, we conclude that the main Neoproterozoic collisional (D2) event in the Sergipano Belt may have lasted at least 57 million years. The Queimada Grande, Camará and Coronel João Sá granites are the record of continental arc in the Sergipano belt formed during the Neoproterozoic collision and its presence indicates that the Macururé domain was connected in the Poço Redondo-Marancó domain before the beginning of the Brasiliano orogeny.
Doutorado
Metalogenese
Doutor em Ciências
Bordinhon, André Moreira 1978. "Autobalanceamento da energia e da proteína da dieta pela tilápia do Nilo por meio de isótopos estáveis de carbono e do consumo de matéria seca /." Botucatu : [s.n.], 2008. http://hdl.handle.net/11449/104115.
Повний текст джерелаBanca: Wilson Massamitu Furuya
Banca: José Fernando Machado Menten
Banca: Carlos Ducatti
Banca: José Roberto Sartori
Resumo: O objetivo deste trabalho foi avaliar a capacidade da tilápia do Nilo em 5 balancear sua dieta, quando fornecidas duas misturas de ingredientes, utilizando os 6 isótopos estáveis de carbono. Foram utilizados 225 juvenis de tilápia (peso: 5,0 ± 0,5 g), 7 distribuídos em cinco tanques. Os indivíduos alocados em um dos tanques eram 8 alimentados com uma mistura de alta proteína (MAP; δ13C = -22,62‰), os alocados em 9 um segundo tanque eram alimentados com uma mistura de baixa proteína (MBP; δ13C = 10 -14,34‰) e os animais dos outros tanques tinham acesso livre a ambas, quatro vezes ao 11 dia. Foram realizadas coletas de músculo, fígado e sangue a cada cinco dias por 86 dias, 12 exceto para o grupo alimentado com MBP (alimentado por 120 dias). As amostras 13 foram analisadas em espectrômetro de massa e as proporções consumidas das misturas 14 foram estimadas a partir do enriquecimento isotópico do carbono (δ13C). O 15 balanceamento realizado indicou redução no consumo relativo de proteína. Contudo, 16 esta relação não apresentou padrão definido em relação ao peso dos indivíduos, ou seja: 17 o balanceamento de proteína e energia para tilápia do Nilo está relacionado 18 principalmente à idade dos animais e não é claro se este processo está relacionado 19 também ao seu peso. As estimativas de consumo de um grupo animais desta espécie por 20 meio dos isótopos estáveis de carbono são semelhantes aos obtidos por outras técnicas, 21 portanto este método permite observação da diversidade deste comportamento no 22 autobalanceamento entre os indivíduos que compõe tal grupo.
Abstract: This study aimed to assess the Nile tilapia ability to balance its own diet, 6 when two ingredient mixes were offered, using carbon stable isotopes. In order to 7 accomplish that, 225 Nile tilapia juveniles (average initial weight 5.0g ± 0.5g) were 8 distributed in five tanks, each containing a group of 45 fish. One group of fish were fed 9 exclusively a high protein mix (HPM; δ13C = -22.62‰), a second one fed only a low 10 protein mix (LPM; δ13C = -14.34‰). The other groups had free access to both mixes 11 (free choice system). The fish from all tanks were fed four times a day. Muscle, liver 12 and blood samples were collected at each five days (from 2 fish/tank/collection) for 86 13 days, except for the fish fed with MBP (fed for a 120 days period). The samples were 14 analyzed in a mass spectrometer and proportions of the mixes consumed were estimated 15 through its carbon isotope enrichment (δ13C). The fish diminished their protein intake 16 along the time. However, consumption did not present a clear pattern in relation to the 17 individual weight, i.e.: protein consumption patterns are mainly related to the age of the 18 individuals and it is not clear if it is also correlated to their weight. The consumption 19 estimative through stable isotopes of carbon did not conflict other studies reported in the 20 literature. Additionally this technique allowed observation of consumption among the 21 individuals from an experimental group 22.
Doutor
Grefe, Imke. "Concentration and isotopic composition of marine nitrous oxide, in particular the oxygen-17 isotope excess." Thesis, University of East Anglia, 2013. https://ueaeprints.uea.ac.uk/48791/.
Повний текст джерелаLo, Tierzo Vivian [UNESP]. "Turnover do carbono nos tecidos de suínos em diferentes fases de crescimento." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/104053.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Universidade Estadual Paulista (UNESP)
Este trabalho objetivou determinar o turnover do carbono no sangue, pâncreas e tíbia de suínos em diferentes períodos de crescimento, utilizando a técnica de isótopos estáveis. Foram utilizados 132 machos castrados e fêmeos, distribuídos ao acaso em quatros tratamentos que consistiam da substituição da dieta a base de milho (planta de ciclo fotossintético C4) por dieta a base de arroz (plantas do ciclo fotossintético C3) em dias distintos: 21; 42; 63; 110 dias de idade, respectivamente para os tratamentos 1, 2, 3 e 4. Para mensurar o turnover do carbono (diluição isotópica) nos tecidos em determinado intervalo de tempo, foram utilizados o modelo de equações de função exponencial do tempo ou modelo sigmoidal de regressão de Boltzmann. Os valores de meias-vidas foram: 15,9; 19,0 e 16,8 dias para o sangue; 14,1; 9,68 e 10,4 dias para o pâncreas; 14,3; 8,0 e 15,1 dias para tíbia com medula nos tratamentos com substituição aos 21, 42 e 63 de idade respectivamente. O pâncreas de acordo com valores de meia vida apresentou um rápido turnover, o sangue e a tíbia com medula apresentaram maiores valores de meia vida
This study aimed to determine the turnover of carbon in the blood, tibia and pancreas of pigs at different growth periods, using the technique of stable isotopes. We used 132 barrows and females were randomly assigned into four groups consisting of replacing the corn-based diet (plant C4 photosynthetic cycle) by diet of rice (C3 photosynthetic cycle plants) on different days: 21; 42, 63; 110 days of age, respectively for treatments 1, 2, 3 and 4. To measure the turnover of carbon (isotope dilution) in tissues given time interval, we used the model equations exponential function of time or template Boltzmann sigmoidal regression. Values of half-lives were 15.9, 19.0 and 16.8 days for the blood; 14.1, 9.68 and 10.4 days for the pancreas, 14.3, 8.0 and 15, one day to the tibia with bone replacement treatments at 21, 42 and 63 of age respectively. The pancreas according to half-life values showed a rapid turnover, blood and tibia with bone showed higher half-life
Brito, Adriano Leal de. "Oxigênio-18 e deutério traçadores do sistema de aqüíferos na Bacia Sedimentar do Araripe." reponame:Repositório Institucional da UFC, 2012. http://www.repositorio.ufc.br/handle/riufc/13703.
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The natural tracers deuterium and oxygen-18 were used to identify the dynamic characteristics of the groundwater reserves in the Araripe Sedimentary Basin, through the analysis of water samples collected in 40 wells in January, April, July and October 2011. The sampling points are located in 08 municipalities and electrical conductivity measurements, which expresses water salinity, were also performed. The results show spatial and temporal variation of the parameters analyzed, but the average values of δ18O in samples from 33 wells is -3.22 ± 0.05 (‰) which is the average rainfall in the region today. Samples of the remaining seven wells showed higher fluctuations and four had values below -3.2 ‰. The meteoric lines that express measures of deuterium versus oxygen-18, constructed with values of each sample show a mean slope of 7.87 ± 0.60 ‰ about the value of the World Meteoric Line. The excess of deuterium in the sample period increased from 7.26 to 9.38 ‰ reflecting internal processes in the aquifer. Samples with values of δ18O in meteoric waters below the current mix of show paleowater already identified with modern recharge water, the samples with these values are not distinguishable by their electrical conductivities that are current in the range of samples characterizing the importance of isotopic tracers
Os traçadores naturais oxigênio-18 e deutério foram utilizados para identificar características dinâmicas das reservas hídricas subterrâneas na Bacia Sedimentar do Araripe, através da análise de amostras de água coletadas em 40 poços nos meses de janeiro, abril, julho e outubro de 2011. Os pontos de amostragem localizam-se em 08 municípios e medidas de condutividade elétrica, que expressa salinidade das águas, também foram realizadas. Os resultados mostram variação espacial e temporal dos parâmetros analisados, mas a média dos valores de δ18O em amostras de 33 poços é de -3,22 ± 0,05 (‰) que é o valor médio das chuvas atuais na região. As amostras dos sete poços restantes apresentaram maiores flutuações e quatro deles apresentaram valores abaixo de -3,2‰. As retas meteóricas, que expressam medidas de deutério versus oxigênio-18, construídas com valores de cada coleta mostram coeficiente angular com média de 7,87 ± 0,60 ‰ cerca do valor da Reta Meteórica Mundial. O excesso de deutério cresceu no período de amostragem de 7,26 a 9,38 ‰ refletindo processos internos no aquífero. As amostras com valores de δ18O em abaixo do das águas meteóricas atuais mostram mistura de paleoáguas já identificadas com águas de recargas modernas; as amostras com estes valores não são distinguíveis pelas suas condutividades elétricas que estão na faixa das amostras atuai caracterizando a importância dos traçadores isotópicos.
Perez, Fernandez Andrea. "Etude expérimentale sur l'échange isotopique dans le système eau-roches carbonatées." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30398.
Повний текст джерелаThe isotopic signatures of carbonate minerals have been applied to illuminate a plethora of natural geochemical processes. This thesis is aimed to assess the rates and or conditions at which such isotope signatures might be altered by fluid-mineral interaction through a series of systematic experimental studies performed with dolomite (CaMg(CO3)2) magnesite (MgCO3) and calcite (Ca-CO3). Ca and Mg isotopic compositions were measured as a function of time during closed-system stoichiometric dolomite dissolution experiments at 50 to 126°C. Although identical to that of the original dolomite at low temperatures, at temperatures >120 °C, the calcium isotopic signature of fluid phase (delta(44/42)Ca fluid) became 0.6±0.1‰ higher than that of the dissolving dolomite over a 4-week period. In contrast, the delta(26/24)Mg fluid, remained equal to that of the dolo-mite both at low and high temperatures. This set of experiments evidences the two-way transfer of calcium in and out of the dolomite structure at elevated temperatures. The results suggest that the inhability of dolomite to precipitate at these conditions is due to the difficulty of Mg to be reincorporated in the dolomite structure. In a follow-up study, magnesite was dissolved at 25°C in the presence of fluids with distinct pH and CO2 pressures. The isotopic compositions of the fluid differed from that of the solid at near-to chemical equilibrium indicating the two-way transfer of magnesium into this mineral at ambient temperatures. A single fractionation mechanism cannot explain the distinct Mg isotope behaviors observed. Further work on carbon isotope exchanges in the calcite water system shows a slow by steady evolution of the carbon isotopic composition towards the accepted equilibrium fractionation factor over the course of nearly year-long experiments after the system had attained bulk chemical equilibrium. Carbon isotope reequilibration rates were found to be approximately four orders of magnitude slower than that of bulk calcite dissolution, suggesting that the rate limiting step to the carbon isotope reequilibration process is the transport of carbon into and out of the bulk mineral after it has exchanged on the surface. The results of this thesis suggest that the Mg, Ca and C isotopic signatures in carbonate minerals are not invariant over geological time-frames and can be readily altered by water-mineral interaction. Such results indicate that the preservation of carbonate mineral signatures require low permeability rock formations or some inhibitory mechanism limiting metal and carbon exchange
Silva, Márcio Luiz da [UNESP]. "Estudo hidroquímico e dos isótopos de urânio nas águas subterrâneas em cidades do Estado do Amazonas (AM)." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/102901.
Повний текст джерелаFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Este trabalho tem por objetivo investigar a hidroquímica elementar, assim como o comportamento geoquímico dos isótopos de 238U e 234U nas águas de subsuperfície em quinze cidades do estado do Amazonas, de maneira a proceder a caracterização de contaminantes ou poluentes que possam estar afetando a qualidade dos recursos hídricos subterrâneos, bem como avaliar a potencialidade do uso dos isótopos naturais de urânio como traçadores hidrológicos nas águas estudadas. Os resultados obtidos para os parâmetros analisados mostram que as águas estudadas são excelentes para o consumo humano, por se situarem dentro dos limites de potabilidade estabelecidos pela legislação vigente. No que diz respeito aos isótopos de urânio, verifica-se que foram determinados valores de razão de atividade 234U/238U entre 1 e 3,5 e de concentração de urânio 238U entre 0,01 ægL-1 e 1,4 ægL-1. Esses resultados e os determinados para outros parâmetros analisados, permitiram classificar os ambientes hidrológicos como redutores, com circulação das águas por estratos contendo minerais com baixas concentrações de urânio. Na cidade de Manaus foi observado acréscimo de razão de atividade 234U/238U na fase líquida no sentido do fluxo subterrâneo. Foram identificadas quatro regiões com tendência de aumento de razão de atividade, no sentido de Uarini a Tefé, Manacapuru a Manaus, Presidente Figueiredo a São Sebastião do Uatumã e Boa Vista do Ramos a Barreirinha, relacionadas a possíveis feições estruturais, à declividade da área de estudo, ao estreitamento da Bacia Sedimentar do Amazonas a partir do seu curso médio, e drenagem orientada pela tectônica.
The purpose of this investigation is to evaluate the hydrochemistry and the geochemical behavior of uranium isotopes (234U e 238U) in groundwaters from cities of the Amazonas State. It intends to verify whether concentrations of one or more dissolved constituents are in such high levels to be considered harmful for consumption. It also aims to evaluate the possible use of the uranium isotopes as natural tracers on the studied aquifers. The obtained data show that the groundwater is appropriate for drinking and industrial purposes, in accordance with the maximum limits established by the legislation. Concerning the uranium isotopes data, the 234U/238U activity ratio ranges between 1 and 3.5, whereas the total 238U uranium concentration from 0.01 ægL-1 up to 1.4 ægL-1. These and other results allowed classify the hydrological environment as reducing, with water circulating through strata containing minerals with low uranium concentration. The 234U/238U activity ratio in the liquid phase increased in the direction of the underground flow in Manaus city. In the direction from Uarini to Tefé, from Manacapuru to Manaus, from Presidente Figueiredo to São Sebastião do Uatumã and from Boa Vista do Ramos to Barreirinha it was verified a 234U/238U activity ratio increase possibly related to geologic structures, declivity of the areas, narrowing of the Amazonic sedimentary basin from its middle course, and drainage guided by tectonics.
Baraut, Lambert. "Etudes expérimentales des fractionnements isotopiques indépendants de la masse dans la réaction de formation de l'ozone en phase plasma." Thesis, Paris, Muséum national d'histoire naturelle, 2019. http://www.theses.fr/2019MNHN0002.
Повний текст джерелаThe Earth's atmosphere has undergone, during its early history, very violent changes in its chemical composition. The emergence of the first photosynthetic living beings has led to the establishment and modification of major biogeochemical cycles. The use of isotopes as tracers of active physico-chemical processes during these periods has been developed since the 1980s. The observation of abnormal isotopic compositions in certain atmospheric molecules (ozone in particular), similar to those observed in meteorites by Clayton (1973), raises questions. Many hypotheses have been proposed to explain this "abnormal" phenomenon. The main objective of this doctoral work is to develop, through experimentation, the study of plasma reactions from an isotopic point of view. In particular, ozone formation third-body reactions, where the formation of an excited intermediate complex is involved in the mechanisms of generating these abnormal isotopic fractionations, will be studied
Berengut, Julian Carlo Physics Faculty of Science UNSW. "Isotope shift and relativistic shift in atomic spectra." Awarded by:University of New South Wales. Physics, 2006. http://handle.unsw.edu.au/1959.4/23900.
Повний текст джерелаPruett, Lee. "Stable Sulfur Isotope Rations from West Antarctica and the Tien Shan Mountains: Sulfur Cycle Characteristics from Two Environmentally Distinct Areas." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/PruettL2003.pdf.
Повний текст джерелаBABINSKI, MARLY. "Metodologia isotopica Pb/Pb. Aplicacao aos migmatitos e rochas." reponame:Repositório Institucional do IPEN, 1988. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9894.
Повний текст джерелаMade available in DSpace on 2014-10-09T14:10:04Z (GMT). No. of bitstreams: 1 03260.pdf: 1951792 bytes, checksum: df5a7d0d061d521c988a4035eb497536 (MD5)
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Morisset, Natalie Carleton University Dissertation Geology. "Stableisotope and radioisotope geochemistry of the Panda Hill carbonatite, Tanzania." Ottawa, 1992.
Знайти повний текст джерелаSernagiotto, Erica Regina [UNESP]. "Rastreabilidade da farinha de vísceras de aves em codornas submetidas a longo período de criação utilizando a técnica dos isótopos estáveis 'delta' 'intpot. 13 c' e 'delta' 'intpot. 15 N'." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/95279.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Universidade Estadual Paulista (UNESP)
O presente trabalho teve por objetivo avaliar a capacidade da técnica dos isótopos estáveis em rastrear a farinha de vísceras de aves (FVA), na alimentação de codornas de corte criadas por longo período, após a substituição da dieta com 8% de FVA por dieta vegetal. Foram utilizadas 320 codornas, distribuídas aleatoriamente em oito tratamentos: dieta vegetal (T1) e sete tratamentos com inclusão de 8% de FVA na dieta, um mantendo a dieta até o final do período experimental (T2), e nos demais a dieta foi substituída aos 42; 56; 70; 84; 98; 112 dias; respectivamente, por dieta vegetal. Para coleta das amostras de músculo peitoral foram sacrificadas ao acaso, quatro aves (n = 4) por tratamento, a cada 14 dias, sendo que no T1 e T2 tiveram início aos 42 dias e nos demais a partir da troca das dietas. Os resultados isotópicos obtidos foram submetidos à análise multivariada de variância (MANOVA) com auxílio do procedimento GLM do programa estatístico SAS. Os tratamentos diferiram do vegetal quando as aves foram sacrificadas duas semanas após a troca da dieta; após esse período os tratamentos experimentais tiveram comportamento semelhante ao vegetal, exceto o T3, que se mostrou semelhante ao T1 no abate 14 dias após a troca da dieta; e do T2 que em todos os períodos de comparação diferiu do T1. Conclui-se que a aplicação da técnica dos isótopos estáveis de carbono e nitrogênio na rastreabilidade da FVA, na alimentação de codornas de corte criadas por longo período é possível nas aves abatidas 14 dias após a troca de dieta, com exceção das aves sacrificadas aos 56 dias de idade.
The present work aimed to evaluate the capability of the stable isotope technique to trace poultry visceral meal (PVM) in the diet of meat quails raised for a long period after substitution of an 8% PVM diet for a vegetable diet. Three hundred and twenty poultries (320) were randomly distributed into eight treatments: vegetable diet (T1) and seven treatments containing 8% PVM in the diet: in one treatment, the same diet was kept until the end of the experimental period (T2), and in the remaining treatments, the diet was substituted at 42, 56, 70, 84, 98, and 112 days, respectively, for a vegetable diet. To collect chest muscle samples, four poultries (n = 4) per treatment were randomly sacrificed at every 14 days, starting at 42 days in T1 and T2 and from diet substitution in the remaining treatments. The obtained isotopic results were subjected to multivariate analysis of variance (MANOVA) using the GLM procedure of SAS statistical software. Treatments differed from the vegetable diet when poultries were sacrificed at two weeks following the diet substitution; after such period, the behavior of experimental treatments was similar to that of the vegetable diet, except for T3, which was similar to T1 at slaughtering at 14 days after the diet substitution, and T2 which, in all comparison periods, differed from T1. In conclusion, the technique of stable isotopes of carbon and nitrogen can be used to trace PVM in the diet of meat quails slaughtered at 14 days after diet substitution, except for poultries sacrificed at 56 days.
Jaramillo, Puentes Andrés. "Rigid isotopy classification of real quintic rational plane curves." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066116/document.
Повний текст джерелаIn order to study the rigid isotopy classes of nodal rational curves of degree $5$ in $\RPP$, we associate to every real rational quintic curve with a marked real nodal point a trigonal curve in the Hirzebruch surface $\Sigma_3$ and the corresponding nodal real dessin on~$\CP/(z\mapsto\bar{z})$. The dessins are real versions, proposed by S. Orevkov~\cite{Orevkov}, of Grothendieck's {\it dessins d'enfants}. The {\it dessins} are graphs embedded in a topological surface and endowed with a certain additional structure. We study the combinatorial properties and decompositions of dessins corresponding to real nodal trigonal curves~$C\subset \Sigma$ in real ruled surfaces~$\Sigma$. Uninodal dessins in any surface with non-empty boundary and nodal dessins in the disk can be decomposed in blocks corresponding to cubic dessins in the disk~$\mathbf{D}^2$, which produces a classification of these dessins. The classification of dessins under consideration leads to a rigid isotopy classification of real rational quintics in~$\RPP$
Lai, Yi Len. "Non-traditional stable isotope constraints on Earth's mantle composition and mass-dependent isotopic fractionation at high temperature." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601207.
Повний текст джерелаCsank, Adam Z. "Research Communication: An International Tree-Ring Isotope Data Bank- A Proposed Repository For Tree-Ring Isotopic Data." Tree-Ring Society, 2009. http://hdl.handle.net/10150/622606.
Повний текст джерелаLinebaugh, Donald W. "Carbon cycling in the York River Estuary: an isotopic and mass balance approach using natural Carbon-14 and Carbon-18 isotopes." W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539791832.
Повний текст джерелаHörnlund, Erik. "Catalytic Properties of Protective Metal-Oxides." Doctoral thesis, KTH, Materials Science and Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3506.
Повний текст джерелаHerrera, Lara Maria. "Antropologia Forense e estimativa da origem geográfica : composição isotópica do esmalte dentário de indivíduos modernos residentes no estado de São Paulo /." Araraquara, 2020. http://hdl.handle.net/11449/192393.
Повний текст джерелаResumo: Em casos de necessidade do estabelecimento da identidade de uma pessoa, quando não há suspeição de quem possa ser o indivíduo, e não há registros ante-mortem para comparação, necessários para aplicação de método de identificação, pode ser realizada a estimativa do perfil biológico (sexo, idade à morte, estatura e ancestralidade). A estimativa da origem geográfica pode auxiliar, reduzindo as possibilidades da origem mais provável do indivíduo, e facilitando nas buscas por identidades. Essa estimativa pode ser feita por meio de análises isotópicas de tecidos biológicos. O esmalte dentário é o tecido mais rígido do corpo humano, e praticamente não sofre alterações quanto às razões isotópicas. O objetivo deste trabalho foi caracterizar a assinatura isotópica de esmalte dentário de indivíduos residentes no estado de São Paulo. Também foi objetivo fazê-lo por regiões ao longo do mencionado estado e por níveis socioeconômicos. Cento e quarenta e dois terceiros molares foram utilizados para extração de esmalte dentário. As amostras foram preparadas e analisadas para carbono e oxigênio em um espectrômetro de massas de razão isotópica (IRMS) acoplado a um analisador do tipo Gas Bench II; para estrôncio, em um espectrômetro de massas de ionização térmica Triton-plus Thermo Finnigan (TIMS). Os valores encontrados de δ18O, δ13C e 87Sr/86Sr estimados para a população do estado de São Paulo foram respectivamente: -5,82‰ ± 0,09, -9,04‰ ± 0,16 e 0,712067 ± 0,000162. Diferenças foram observada... (Resumo completo, clicar acesso eletrônico abaixo)
Doutor
Mastren, T., A. Pen, G. F. Peaslee, N. Wosniak, S. Loveless, S. Essenmacher, L. Sobotka, D. Morrissey, and S. E. Lapi. "Isotope harvesting at heavy ion fragmentation facilities." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-166037.
Повний текст джерелаMacMillar, Susanna. "Isotopes as Mechanism Spies : Nucleophilic Bimolecular Substitution and Monoamine Oxidase B Catalysed Amine Oxidation Probed with Heavy Atom Kinetic Isotope Effects." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis (AUU), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7441.
Повний текст джерелаVachon, Ryan W. "Using a new network of isotopes of precipitation within the United States (USNIP) to better understand mid-latitude isotope-climate relationships." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219033.
Повний текст джерела