Relevant bibliographies by topics / Isotopies

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Isotopies'

Author: Grafiati
Published: 11 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Isotopies.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Isotopies"

1

FIEDLER, T., and V. KURLIN. "FIBER QUADRISECANTS IN KNOT ISOTOPIES." Journal of Knot Theory and Its Ramifications 17, no. 11 (November 2008): 1415–28. http://dx.doi.org/10.1142/s0218216508006695.

Full text
Abstract:
Fix a straight line L in Euclidean 3-space and consider the fibration of the complement of L by half-planes. A generic knot K in the complement of L has neither fiber quadrisecants nor fiber extreme secants such that K touches the corresponding half-plane at 2 points. Both types of secants occur in generic isotopies of knots. We give lower bounds for the number of these fiber secants in all isotopies connecting given isotopic knots. The bounds are expressed in terms of invariants calculable in linear time with respect to the number of crossings.
APA, Harvard, Vancouver, ISO, and other styles
2

Ellis, David. "Remarks on isotopies." Publicationes Mathematicae Debrecen 2, no. 3-4 (July 1, 2022): 175–77. http://dx.doi.org/10.5486/pmd.1952.2.3-4.04.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Perron, B. "Pseudo-isotopies et isotopies en dimension quatre dans la categorie topologique." Topology 25, no. 4 (1986): 381–97. http://dx.doi.org/10.1016/0040-9383(86)90018-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Kalliongis, John, and Darryl McCullough. "Isotopies of 3-manifolds." Topology and its Applications 71, no. 3 (July 1996): 227–63. http://dx.doi.org/10.1016/0166-8641(96)00006-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Opshtein, Emmanuel. "Polarizations and symplectic isotopies." Journal of Symplectic Geometry 11, no. 1 (2013): 109–33. http://dx.doi.org/10.4310/jsg.2013.v11.n1.a6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Lashof, R. "Equivariant isotopies and submersions." Illinois Journal of Mathematics 29, no. 1 (March 1985): 11–24. http://dx.doi.org/10.1215/ijm/1256045838.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

ZIMMERMANN, B. "ISOTOPIES OFHAKEN-3-ORBIFOLDS." Quarterly Journal of Mathematics 40, no. 3 (1989): 371–76. http://dx.doi.org/10.1093/qmath/40.3.371.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Wołowska, Katarzyna. "Les réseaux isotopiques //centrifuge// et //centripète// dans Le dehors et le dedans de Nicolas Bouvier à la lumière de la sémantique interprétative textuelle." Moderna Språk 116, no. 2 (December 28, 2022): 183–200. http://dx.doi.org/10.58221/mosp.v116i2.12250.

Full text
Abstract:
L’objectif de l’article, situé dans la perspective théorique de la sémantique interprétative française, est d’analyser les réseaux isotopiques dominants dans le recueil de poèmes de Nicolas Bouvier, écrivain, photographe et voyageur suisse. Le texte se compose de deux volets, Le dehors (poèmes de voyage) et Le dedans (poèmes subjectifs), et, comme cette division de sa structure se révèle sémantiquement pertinente, elle est prise en compte dans l’analyse. Celle-ci, centrée sur l’identification et la description d’isotopies sémantiques qui s’affirment dans l’interprétation, admet ainsi plusieurs paliers de généralité : microtextuel (chaque poème considéré comme une unité de sens interprétable à part), intratextuel (celui de chacune des deux parties du volume envisagée séparément), macrotextuel (totalité du recueil) et intertextuel (interne et externe). L’analyse privilégie les niveaux intratextuel et macrotextuel où s’attestent les isotopies les plus importantes, à portée globale, dont les deux principales, à statut de macro-isotopie, sont celles de //centrifuge// et de //centripète//. Les deux forment respectivement des réseaux isotopiques fondés sur la récurrence de sèmes isotopants connexes (comme /voyage/, /extérieur/, /exotique/, /étranger/, /inconnu/ etc. pour //centrifuge// et /intérieur/, /subjectif/, intime/, /émotion/ etc. pour //centripète//) qui se complètent et entrent dans différentes interrelations sur le plan macrotextuel.
APA, Harvard, Vancouver, ISO, and other styles
9

Oversteegen, Lex, and Edward Tymchatyn. "Extending isotopies of planar continua." Annals of Mathematics 172, no. 3 (October 5, 2010): 2105–33. http://dx.doi.org/10.4007/annals.2010.172.2105.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Gardiner, Frederick P., Yunping Jiang, and Zhe Wang. "Guiding isotopies and holomorphic motions." Annales Academiae Scientiarum Fennicae Mathematica 40 (January 2015): 485–501. http://dx.doi.org/10.5186/aasfm.2015.4031.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Isotopies"

1

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Karlsson, 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.

Full text
Abstract:
Let C and C′ be two smooth self transverse immersions of S1 into R2. BothC and C′ divide the plane into a number of disks and one unbounded component.An isotopy of the plane which takes C to C′ induces a 1-1 correspondence betweenthe disks of C and C′. An obvious necessary condition for there to exist an areapreserving isotopy of the plane taking C to C′ is that there exists an isotopy forwhich the area of every disk of C has the same area as the corresponding disk ofC′. In this paper we show that this is also a sufficient condition.
APA, Harvard, Vancouver, ISO, and other styles
3

Nibigira, 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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rolin, Jean-Philippe. "Géométrie intégrale et invariants d'isotopie." Dijon, 1985. http://www.theses.fr/1985DIJOS035.

Full text
Abstract:
On démontre des inégalités à la Minkowski entre volumes mixtes de polyèdres convexes et de polygones de Newton. On calcule des invariants d'isotopie de Milnor des enlacements algébriques à trois composantes. On étudie quelques propriétés des invariants de Milnor.
APA, Harvard, Vancouver, ISO, and other styles
5

Técourt, Jean-Pierre. "Sur le calcul effectif de la topologie de courbes et surfaces implicites." Nice, 2005. http://www.theses.fr/2005NICE4057.

Full text
Abstract:
Dans cette thèse nous nous sommes intéressés au problème du calcul effectif de la topologie de courbes et surfaces implicites. On peut distinguer quatres travaux différents: Dans une première partie, on présente un algorithme permettant de calculer la topologie d'une courbe de R3 définie comme intersection de deux surfaces algébriques. C'est à dire le calcul d'un graphe de points isotope à la courbe de départ. Puis on détaille un algorithme de calcul d'un arrangement de quadriques par balayage, basé sur une décomposition en ``trapézoides'' du plan de balayage. La troisième partie est consacré à un algorithme de triangulation de surfaces algébriques. Cet algorithme basé sur le calcul d'une stratification de Whitney de la surface est le premier fournissant un maillage isotopique à la surface de départ y compris dans le cas de surfaces singulières. Enfin, on étudie une famille de surfaces paramétrées, les surfaces de Steiner, apportant des réponses aux problèmes de classification effective, implicitisation et calcul d'antécénts
In 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
APA, Harvard, Vancouver, ISO, and other styles
6

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Missire, Régis. "Sémantique des textes et modèle morphosémantique de l'interprétation." Toulouse 2, 2005. http://www.theses.fr/2005TOU20047.

Full text
Abstract:
Le propos est de contribuer au développement d'un modèle morphosémantique de l'interprétation pour une sémantique des textes. On s'attache notamment à mesurer l'adéquation entre la théorie (sémantique interprétative) et un modèle s'inspirant de la gestaltthéorie et de la Théorie des Formes Sémantiques. On formule à cet effet des propositions : (i) théoriques, qui visent, en restituant la sémantique interprétative dans le cadre des sémantiques structurales européennes, tout particulièrement la lexématique, à accroître l'adéquation entre théories structurales et gestaltistes ; (ii) descriptives dans le cadre du modèle morphosémantique, en s'attachant particulièrement au concept d'isotopie et à la question de la temporalisation des parcours interprétatifs (rythmes sémantiques). Les propositions sont étayées de deux analyses, la première portant sur un sonnet de Baudelaire (Tristesses de la lune), la seconde sur un corpus de 113 définitions produites par autant de locuteurs auxquels a été soumis un texte dans lequel figure un mot à définir
The 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
APA, Harvard, Vancouver, ISO, and other styles
8

Sanseverino, Giulio. "Le voci di Camus tra soggettività e ritraduzione." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/353462.

Full text
Abstract:
In quanto poiesi ibrida sul piano estetico e culturale, frutto della duplice enunciazione di autore e traduttore, oltre che di numerosi interventi intermedi da parte di agenti esterni, il testo letterario tradotto racchiude un dialogo umbratile (Prete 2011) che, se studiato da vicino, può rivelare l’irriducibilità del testo originario in quei suoi tratti di plasticità semantica (Hawthorne 2006) che varcano le frontiere linguistiche e temporali di un canone per confluire, tramite nuove parole, in un altro. In prospettiva diacronica, un simile dialogo si compone di molte voci, ognuna delle quali acquista senso sia nella catena di traduzioni che nel tempo rende fruibili differenti interpretazioni del testo e poetiche del tradurre, sia in quanto complemento concreto dell’ininterrotto lavoro di analisi critica compiuto sul testo dopo la comparsa dell’opera originale. Partendo da queste premesse, il progetto di ricerca prende le mosse dalla recente comparsa, sul mercato editoriale italiano, delle ritraduzioni de L’Étranger (1942) e La Peste (1947) di Albert Camus per i tipi Bompiani: Lo Straniero (2015), ad opera di Sergio Claudio Perroni, e La Peste (2017) di Yasmina Melaouah, che dopo parecchi decenni avviano infine un dialogo con le prime traduzioni, rispettivamente di Alberto Zevi (1947) e Beniamino Dal Fabbro (1948). L’obiettivo è quello di esporre alcune delle forme di somiglianza e divergenza dalle quali sia possibile sondare la postura traduttiva dei rispettivi autori, che su quei testi hanno proiettato inevitabilmente una propria concezione del tradurre, una storia, una poetica individuale, nondimeno figlia del proprio tempo, ossia radicata in un sistema culturale retto da norme linguistiche, editoriali e traduttive con le quali la voce del singolo deve necessariamente misurarsi. Attraverso una metodologia eclettica che si muove tra la stilistica, la semiotica, la linguistica e la narratologia delle forme letterarie, il confronto analitico condotto tra le prime e la seconde traduzioni delinea i profili di lavoro dei quattro traduttori seguendo tre principali direttrici di indagine: in primo luogo, verificare le eventuali discordanze tra le rispettive dichiarazioni paratestuali (reperite in pre/postfazioni, note alla traduzione, saggi, interviste, diari di bordo, etc.) a proposito della strategia adottata e gli esiti dell’operato concreto sui testi; in secondo luogo, esaminare l’imprescindibile manifestarsi in diacronia delle norme traduttive operanti all’atto del tradurre ma attraverso il filtro delle voci individuali, che si sono espresse sotto l’influenza di vincoli differenti e in momenti distinti della vita di questi testi, contribuendo alla loro longevità; infine, testare l’adeguatezza della cosiddetta Retranlsation Hypohtesis avanzata da Berrman e Bensimon (1990) e poi formalizzata in anni più recenti da Chesterman (2000). L’indagine ha dunque interessato tanto i paratesti reperibili che fossero latori di una certa concezione del tradurre, quanto una moltitudine di passi topici estratti dalle tre versioni (i due testi di partenza e i quattro d’arrivo) de L’Étranger e de La Peste che, messi in parallelo, fungessero sul piano quantitativo e qualitativo da campo di ispezione sensibile della realizzazione dei comportamenti individuali. Questi ultimi sono stati studiati per mezzo di un modello analitico fondato, da una parte, sull’isotopia come strumento di coerenza testuale; dall’altra, sulla distinzione tra shift opzionali, obbligatori e non-shifts quale nervo scoperto del processo traduttivo (Pekkanen 2010), accogliendo inoltre proposte molteplici riguardo agli strumenti di descrizione traduttiva (Vinay e Darbelnet 1958; Murtisari 2013; Dussart 2005; Ladmiral 1979, 1997; Harvey 1995). I risultati dell’analisi sono eterogenei e non conformi alla Retranslation Hypothesis. La predominanza del letteralismo nelle prime traduzioni difficilmente si concilia con quello sforzo di acclimatazione rivolto al lettore d’arrivo che l’ipotesi assegnerebbe sistematicamente alle prime traduzioni-introduzioni, benché l’attitudine assimilatrice si rilevi nel conformismo ad alcuni imperativi culturali ed editoriali dell’epoca (l’italianizzazione onomastica; la tendenza interpuntiva nel segno dell’ipotassi; la nobilitazione del lessico). Allo stesso tempo, le due ritraduzioni, pur con spirito assai diverso e sebbene risultino in effetti più attente alle peculiarità stilistiche dei rispettivi prototesti (come vorrebbe l’ipotesi), non adottano tuttavia procedimenti che esibiscano, senza una motivazione fondata, l’alterità del testo straniero, che anzi tendono a naturalizzare in senso fraseologico, senza per questo snaturarlo. Se di miglioramento si possa parlare all’infuori dell’evoluzione dei parametri estetici tra le due epoche (fine anni ’40 del Novecento e metà degli anni ’10 del nuovo millennio), esso andrà riconosciuto, da una parte, nell’integrità oggettivamente superiore delle ritraduzioni in termini di completezza testuale e riproduzione degli stilemi – dato che nelle prime non mancano transfert imprecisi, incompleti o scorretti dovuti a calchi strutturali o lessicali, falsi amici e interpretazioni contrarie al senso degli enunciati; dall’altra parte, le migliorie vanno attribuite senza ombra di dubbio alla professionalizzazione del mestiere e a una maggiore competenza dei ritraduttori come lettori modello dei testi affrontati, che hanno potuto studiare grazie a una straordinaria disponibilità di strumenti critici non esistenti all’epoca delle prime traduzioni. Ciò sembra aver permesso loro di scandagliare le tecniche narrative e le isotopie più significative così da porle come dominanti del proprio lavoro.
Cette 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.
APA, Harvard, Vancouver, ISO, and other styles
9

Juniati, Dwi. "De la régularité Lipschitz des espaces stratifiés." Aix-Marseille 1, 2002. http://www.theses.fr/2002AIX11006.

Full text
Abstract:
T. Mostowski a introduit le concept de "stratification Lipschitz" et a démontré l'existence d'une telle stratification pour tout ensemble analytique complexe. Ensuite, A. Parusinski a généralisé ce résultat aux ensembles analytiques réels, puis aux ensembles sous-analytiques (1994). La condition de régularité dite Lipschitz est beaucoup plus forte que la condition (b) de Whitney ou la condition (w) de Kuo-Verdier. B. Teissier a remarqué en 1974 qu'une des propriétés désirables pour une condition de régularité d'une stratification est que cette condition de régularité se conserve par intersection par un sous-espace non-singulier général contenant la petite strate. Cette propriété est vérifiée pour la condition w sur les ensembles sous-analytiques (Navarro Aznar-Trotman, 1981). Dans le chapitre 2, nous démontrons que la condition Lipschitz se conserve par intersection par un sous espace contenant la petite strate, pour les ensembles sous-analytiques et les ensembles analytiques complexes. Dans le chapitre 3, nous donnons une classification des stratifications Lipschitz constituées de deux strates (Reg V, Sing V) pour toutes les surfaces algébriques V de[ R3] ou [C3] du type : {(x,y,z) I y[a] = z[b]x[c] + x[d]}. Cette classification étend celle deTrotman (1985) pour les conditions a et b, et de Noirel (1996) pour la condition w. Selon T. C. Kuo, la classification de cette famille est importante, surtout pour construire des exemples. Dans ce chapitre nous donnons aussi un exemple montrant que la trivialité bilipschitz locale n'implique pas la condition Lipschitz. On donne des images des exemples de la classification en utilisant le programme surf de l'Université de Mainz. Dans le chapitre 4, nous donnons des conditions pour qu'une stratification quasi-homogène vérifie la condition w de Kuo-Verdier, ou soit localement lipschitz triviale. Notre résultat est l'analogue d'un théorème de K. Bekka (1997) portant sur sa condition C, notion assez faible impliquant toujours la trivialité topologique locale
APA, Harvard, Vancouver, ISO, and other styles
10

Nilsson, 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.

Full text
Abstract:
Release of different nitrogen compounds can cause eutrophication in lakes and rivers whichcan lead to oxygen-free environments in bottom water and in the sediment and can in turnlead to fish-deaths. Ammonium can be toxic to biota and nitrate can in high concentrationeven be toxic to humans. WHO has released a limit for nitrate concentration in drinking waterof 10mg/l. The LKAB mine in Kiruna is the largest underground iron mine in the world and isprospecting, mining and refining iron ore, with an annual production of around 28 milliontons. Release of different nitrogen compounds as a result of the explosives used during themining operations has been a known problem for some time; however the processes affectingnitrogen during the water transport have never been fully investigated. The main objective of this MSc thesis is to determine if changes in nitrogen and oxygenisotope composition can be used as a tracer for nitrogen transformation processes in the minewater at LKABs underground mine in Kiruna. Water samples were collected at key points in the water transport system and were analyzedfor isotopic composition. Isotopic and chemical data revealed two different sources of nitrateand ammonium, undetonated explosives and leachate from waste rocks. Three differentnitrogen changing processes affecting concentration of nitrate and ammonium were found:ammonium volatilization, nitrification and sorption. It was not possible to quantify theseprocesses individually. No processes which decrease the nitrate concentration were found.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Isotopies"

1

1959-, Kadeisvili J. V., and Santilli Ruggero Maria 1935-, eds. Isotopies of contemporary mathematical structures. Palermo: Sede della società, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kadeisvili, J. V. Santilli's isotopies of contemporary algebras, geometries, and relativities. Palm Harbor, FL, U.S.A: Hadronic Press, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

M, Andreev B., ed. Separation of isotopes of biogenic elements in two-phase systems. Amsterdam: Elsevier, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Arnikar, Hari Jeevan. Isotopes in the atomic age. New Delhi: Wiley Eastern, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Isotopes in the atomic age. New York: Wiley, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

M, Johnson Clark, Beard Brian L, Albarède Francis, American Geophysical Union Meeting, and Canadian Geophysical Union Meeting, eds. Geochemistry of non-traditional stable isotopes. Washington, DC: Mineralogical Society of America, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

W, Valley John, Cole David R, and Mineralogical Society of America, eds. Stable isotope geochemistry. Washington, D.C: Mineralogical Society of America, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Principles of isotope geology. 2nd ed. New York: Wiley, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Stable isotope geochemistry. 4th ed. Berlin: Springer, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Symons, E. A. Lithium isotope separation: A review of possible techniques. Mississauga: CFFTP, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Isotopies"

1

Earle, Clifford J., and Curt McMullen. "Quasiconformal isotopies." In Mathematical Sciences Research Institute Publications, 143–54. New York, NY: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-9602-4_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Segre, Cesare. "Les isotopies de Laure." In Exigences et perspectives de la sémiotique, 811–26. Amsterdam: John Benjamins Publishing Company, 1985. http://dx.doi.org/10.1075/z.23.72seg.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Madsen, I., and M. Rothenberg. "Equivariant pseudo-isotopies and K−I." In Transformation Groups, 216–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/bfb0085612.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Hodgson, Craig, and J. H. Rubinstein. "Involutions and isotopies of lens spaces." In Lecture Notes in Mathematics, 60–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/bfb0075012.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Werner, Roland A., and Marc-André Cormier. "Isotopes—Terminology, Definitions and Properties." In Stable Isotopes in Tree Rings, 253–89. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_8.

Full text
Abstract:
AbstractThe intention of this chapter is to give insight into the properties and peculiarities of the stable isotopes of the bioelements. Following an overview about the terminology and ʻtechnical jargonʼ used in stable isotope sciences, methods to calculate and express isotopic abundances are presented. Subsequently, a short description of the physicochemical basis of equilibrium and kinetic (mass-dependent) isotope effects (EIEs and KIEs) as origin of isotope fractionation in chemical and biological systems is given. Further, measures for calculation and presentation of isotope fractionation are introduced and the corresponding properties of these quantities are critically discussed. Finally, examples for equilibrium and kinetic isotope fractionation in biochemical reactions are presented in more details and subsequent effects and consequences including the relationship between EIEs and KIEs are reviewed.
APA, Harvard, Vancouver, ISO, and other styles
6

Pfahler, V., J. Adu-Gyamfi, D. O’Connell, and F. Tamburini. "The Use of the δ18OP to Study P Cycling in the Environment." In Oxygen Isotopes of Inorganic Phosphate in Environmental Samples, 1–15. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97497-8_1.

Full text
Abstract:
AbstractPhosphorus (P) fertilizers are known to increase crop productivity; however, when applied in excess, it can cause serious environment pollution. Monitoring P pollution in natural environments using stable isotopes has been difficult because P has only one stable isotope (31P) making the use of P stable isotope tracing not an option. Radioactive P isotopes (32P and 33P) have been used but its drawbacks are the short half-life, health risks and safety procedures required to apply them in agricultural catchments. Phosphorus in organic and inorganic P forms is strongly bonded to oxygen (O), which has three stable isotopes, providing a system to track P cycling in agricultural catchments and environment using the stable isotopes of O in phosphate (δ18O-PO4). In recent years, various studies have indicated that the analysis of the stable isotopic composition of oxygen (O) bound to P (δ18Op) to better understand P cycling in the environment, has become a promising tracer (surrogate) to investigate soil P transformation, plant P uptake and to trace the sources of P from the soil to water bodies and the environment. The chapter outlines the background and examples of δ18Op studies in sediments, soils, fresh water, mineral fertilizers and plants.
APA, Harvard, Vancouver, ISO, and other styles
7

Helle, Gerhard, Maren Pauly, Ingo Heinrich, Karina Schollän, Daniel Balanzategui, and Lucas Schürheck. "Stable Isotope Signatures of Wood, its Constituents and Methods of Cellulose Extraction." In Stable Isotopes in Tree Rings, 135–90. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_5.

Full text
Abstract:
AbstractIn this chapter, we give some basic information on the chemical and isotopic properties of wood constituents and describe their relative contribution to the isotopic signature of wood. Based on these considerations we review studies that have compared stable isotope signals of wood with those of corresponding cellulose. We exemplify how relationships of wood-based tree-ring stable isotope sequences with climate can be affected by varying proportions of wood constituents like cellulose, lignin and extractives. A majority of benchmarking studies suggests that cellulose extraction may not be necessary. However, based upon existing research, a general statement cannot be made on the necessity of cellulose extraction. Changes in wood composition can particularly influence environmental signal strength during periods of low isotope variability. Cellulose extraction removes any effects from changing wood composition. We present the three established chemical approaches of extraction, outline how to test the purity of isolated cellulose and present user-friendly efficient experimental setups allowing to simultaneously process hundreds of samples in one batch. Further, we briefly address the analysis of stable isotopes of lignin methoxyl groups because of easy sample preparation and its potential additional value for studies on fossil wood.
APA, Harvard, Vancouver, ISO, and other styles
8

Kagawa, Akira, and Giovanna Battipaglia. "Post-photosynthetic Carbon, Oxygen and Hydrogen Isotope Signal Transfer to Tree Rings—How Timing of Cell Formations and Turnover of Stored Carbohydrates Affect Intra-annual Isotope Variations." In Stable Isotopes in Tree Rings, 429–62. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_15.

Full text
Abstract:
AbstractIn this chapter, we discuss post-photosynthetic processes that affect intra-annual variation in the stable isotopes of tree rings, such as timing of cell formations and turnover of stored carbohydrates, by combining research findings gained by using either natural-abundance or artificially-enriched carbon, oxygenand hydrogen isotopes. We focus on within-ring variation in stable isotope ratios, with an emphasis on aligning observed ratios in whole wood or extracted cellulose to seasonal dynamics in climate and phenology. We also present a discussion of isotopic fractionation that operates within the scope of observed variations across individual rings. We then introduce a model that traces the seasonal partitioning of photosynthate into tree rings via storage pool, which is based on experimental data gained from labeling studies using artificially enriched 13CO2 gas. Finally, we will describe our current understanding of post-photosynthetic signal transfer processes of oxygenand hydrogen isotopes from leaves to tree rings, such as exchange of oxygen and hydrogen between storage carbohydrates and local cambial water, and possible causes of difference in oxygen and hydrogen isotope fractionations. Finally, we discuss mechanisms behind how oxygen and hydrogen from foliar-absorbed liquid water is then incorporated into wood biomass, by introducing results gained from recent H218O and HDO pulse-labeling experiments.
APA, Harvard, Vancouver, ISO, and other styles
9

Kagawa, Akira, and Giovanna Battipaglia. "Post-photosynthetic Carbon, Oxygen and Hydrogen Isotope Signal Transfer to Tree Rings—How Timing of Cell Formations and Turnover of Stored Carbohydrates Affect Intra-annual Isotope Variations." In Stable Isotopes in Tree Rings, 429–62. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_15.

Full text
Abstract:
AbstractIn this chapter, we discuss post-photosynthetic processes that affect intra-annual variation in the stable isotopes of tree rings, such as timing of cell formations and turnover of stored carbohydrates, by combining research findings gained by using either natural-abundance or artificially-enriched carbon, oxygenand hydrogen isotopes. We focus on within-ring variation in stable isotope ratios, with an emphasis on aligning observed ratios in whole wood or extracted cellulose to seasonal dynamics in climate and phenology. We also present a discussion of isotopic fractionation that operates within the scope of observed variations across individual rings. We then introduce a model that traces the seasonal partitioning of photosynthate into tree rings via storage pool, which is based on experimental data gained from labeling studies using artificially enriched 13CO2 gas. Finally, we will describe our current understanding of post-photosynthetic signal transfer processes of oxygenand hydrogen isotopes from leaves to tree rings, such as exchange of oxygen and hydrogen between storage carbohydrates and local cambial water, and possible causes of difference in oxygen and hydrogen isotope fractionations. Finally, we discuss mechanisms behind how oxygen and hydrogen from foliar-absorbed liquid water is then incorporated into wood biomass, by introducing results gained from recent H218O and HDO pulse-labeling experiments.
APA, Harvard, Vancouver, ISO, and other styles
10

Andreu-Hayles, Laia, Mathieu Lévesque, Rossella Guerrieri, Rolf T. W. Siegwolf, and Christian Körner. "Limits and Strengths of Tree-Ring Stable Isotopes." In Stable Isotopes in Tree Rings, 399–428. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_14.

Full text
Abstract:
AbstractThis chapter aims at summarizing strengths and caveats on the suitability of stable carbon and oxygen isotopes in tree rings as recorders for fingerprints of environmental influences. First, environmental constraints limiting tree growth and shaping tree species distribution worldwide are discussed. Second, examples are presented for environmental conditions under which tree-ring isotopes record environmental signals particularly well, but also cases where physiological processes can mask climate signals. Third, the link between leaf-level carbon assimilation and the investment of assimilates in the stem during the annual ring formation are discussed in light of the resulting deviations of the isotopic values between leaves and tree rings. Finally, difficulties and pitfalls in the interpretation of stable isotope signals in tree rings are reviewed. These problems often result from a poor understanding of when and how the tree canopy, stems and roots are physiologically interconnected. Current literature suggests that photosynthesis and radial growth are only loosely coupled, if at all, challenging the interpretation of environmental signals recorded in tree-ring isotopes. Harsh environmental conditions (e.g. low temperatures, drought) often result in a decoupling of carbon assimilation and growth. The chapter closes by providing possible solutions on how to improve the detection of environmental information from stable isotope signals by integrating scales and different methodological approaches.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Isotopies"

1

de Mesmay, Arnaud, and Éric Colin de Verdière. "Testing graph isotopies on surfaces." In the 2012 symposuim. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2261250.2261271.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mostowski, Tadeusz. "Lipschitz stratifications and Lipschitz isotopies." In Geometric Singularity Theory. Warsaw: Institute of Mathematics Polish Academy of Sciences, 2004. http://dx.doi.org/10.4064/bc65-0-13.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

BANYAGA, AUGUSTIN, and PAUL DONATO. "A NOTE ON ISOTOPIES OF SYMPLECTIC AND POISSON STRUCTURES." In Infinite Dimensional Lie Groups in Geometry and Representation Theory. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777089_0010.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Travis, J. C., T. B. Lucatorto, J. Wen, J. D. Fassett, and C. W. Clark. "Doppler-Free Resonance Ionization Mass Spectrometry of Beryllium." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/laca.1987.tub2.

Full text
Abstract:
As originally conceived, resonance ionization mass spectrometry (RIMS) combined the elemental selectivity of resonance ionization (1) with the isotopic selectivity of mass spectrometry to improve the accuracy and sensitivity of conventional mass spectrometry (2). For many applications, especially quantitation by isotope dilution (3) , it is important that no isotopic selectivity accompany the resonance ionization process. This condition is easily met for all but a few elements of the periodic table (4), since the great majority of optical isotope shifts are small with respect to typical dye laser bandwidths and Doppler-broadened linewidths in common atom reservoirs. However, another class of problem exists for which it is desirable to achieve isotopically selective resonance ionization. These applications involve the detection of extremely, rare stable or radioactive isotopes in the presence of the major isotopic species of an element. Miller et al. (5) have explored the optical isotopic selectivity of the isotopes of Lu using a RIMS spectrometer equipped with a high-resolution (single-mode) continuous-wave (cw) laser. Cannon et al. (6) have measured an optical selectivity (defined below) of 800 for isotopes of Ba, using a RIMS spectrometer with two cw lasers. We have proposed the use of pulsed, two-photon, Doppler-free resonance ionization to extend the capability of conventional mass spectrometers to measure isotope ratios in excess of 1012 (7). Initial experimental results using this approach, for the isotopes 9Be and 10Be, are reported here.
APA, Harvard, Vancouver, ISO, and other styles
5

Wunderlich, R. K., G. J. Wasserburg, I. D. Hutcheon, and G. A. Black. "Laser-induced mass selectivity in resonance ionization mass spectrometry of Os." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.wp1.

Full text
Abstract:
Measurements of isotope ratios by resonance ionization mass spectrometry depend critically on knowledge of isotopic-specific effects in the laser excitation-ionization process. Reports of odd-even isotope selectivity in RIMS studies of Mo, Sn,1 and Ti have led us to investigate isotope shifts in a RIMS study of Os. We identify three sources of laser-induced mass selectivity: (i) wavelength and bandwidth effects, (ii) selection rule and polarization effects, and (iii) dynamic effects.2 (i) In the presence of optical isotope shifts and hyperfine structure the finite laser bandwidth and reproducibility of wavelength setting produce isotope shifts as a result of the incomplete overlap of the laser spectrum with the absorption maxima of the Os isotopes and their HFS components.
APA, Harvard, Vancouver, ISO, and other styles
6

Abood, Tagrid. "Sensualisation de l'eau: l'exemple du Bain dans Au château d'Argol." In XXV Coloquio AFUE. Palabras e imaginarios del agua. Valencia: Universitat Politècnica València, 2016. http://dx.doi.org/10.4995/xxvcoloquioafue.2016.3084.

Full text
Abstract:
Dans Au château d'Argol de Julien Gracq, la mer est un élément essentiel de la fiction, elle aide à comprendre l'objet du désir. En effet, le rapport d'analogie que l'écrivain tisse entre la mer et l'être humain rappelle tout de suite l'image de la mer-matrice. Celle-ci est conceptualisée métaphoriquement grâce au transfert sémique entre ces deux isotopies. Ce qu'éprouvent encore les trois personnages d'Argol pendant la plongée révèle d'un plaisir sensuel dû à la fusion avec l'eau. La dissolution exprime le désir de l'anéantissement de soi au profit de l'autre et l'aspiration à une renaissance universelle.DOI: http://dx.doi.org/10.4995/XXVColloqueAFUE.2016.3084
APA, Harvard, Vancouver, ISO, and other styles
7

Pyrayev, A. N., and A. A. Maksimova. "ISOTOPIC COMPOSITION OF GROUNDWATER IN OIL AND GAS DEPOSITS IN THE CENTRAL PART OF THE TRANS-URAL MEGAMONOCLISE." In All-Russian Youth Scientific Conference with the Participation of Foreign Scientists Trofimuk Readings - 2021. Novosibirsk State University, 2021. http://dx.doi.org/10.25205/978-5-4437-1251-2-117-120.

Full text
Abstract:
The article presents the first results of complex isotope-hydrogeochemical studies of reservoir waters of the Upper Jurassic deposits of the central regions of the Zaural megamonoclysis. It was shown that most waters have a narrow distribution of oxygen and hy-drogen isotopes (δD from 103,2 to –85,6 % and δ18O from –15,4 to –12,9 %). Some of them have pronounced excursions on the isotopic composition, which indicates a difference in their genesis: from condensate to mixed with ancient infiltrogenic. The isotopic composition of car-bon of water-dissolved carbon dioxide (δ13СDIC from –41,6 to –16,3 %) indicates its biogenic origin and the possibility of interstratal flows from overlying horizons.
APA, Harvard, Vancouver, ISO, and other styles
8

Almubarak, Zainab, Mohammad Alrowaie, Feng Lu, and Ranya Algeer. "Gas Chemical and Carbon Isotope Composition as a Diagnostic Tool for Energy." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209992-ms.

Full text
Abstract:
Abstract As the world is moving toward a low-carbon energy structure, natural gas has become critical in the supply of global energy. The genetic identification of different types of natural gas is important for the assessment of their source and exploration potential. Chemical and carbon isotopic compositions of produced gas are useful tools to assess their origin, thermal maturity, migration and to monitor gas production. In this study, we present different geochemical approaches to assess the origin of the gases and thermal maturity as well as to evaluate the effect of adsorption on shale gas during production. Thirteen gas samples from different conventional reservoirs were analyzed for their isotopic compositions to assess gas origin and thermal maturity. To assess gas production, seven gas samples were collected periodically from the same unconventional shale interval and were analyzed for their isotopic signatures. The results demonstrate that carbon isotopic composition of methane to pentane can be used as fingerprinting tool to identify different sources of gas. The studied gases are all of a thermogenic origin and were generated from Type-II marine source rocks. Mixing of gases generated from different source rocks were observed. The mixed gases are characterized by similar isotopic profiles in methane and ethane and they differ in C3+ hydrocarbons. Thermal maturity trends were identified on the studied samples using the relationship between methane, ethane, and propane isotopes versus the wetness index (total HC/methane concentration). To study the effect of gas adsorption during production, samples produced from the same hydrocarbon source rock were assessed at different time intervals (one-year period of production). The results show small variations between isotope compositions; thus, the impact of adsorption is still uncertain and a longer-term monitoring plan is designed. The results of this study shed insight into using isotope geochemistry as an important diagnostic tool for natural gas exploration and production.
APA, Harvard, Vancouver, ISO, and other styles
9

Răchişan, Delia-Anamaria. "Names of saints and holidays in various Romanian ethnographic areas and cultural spaces." In International Conference on Onomastics “Name and Naming”. Editura Mega, 2022. http://dx.doi.org/10.30816/iconn5/2019/66.

Full text
Abstract:
The paper aims to highlight two aspects: on the one hand, to what extent names of saints interact with names of holidays in the Christian (Orthodox, Greek-Catholic, Roman-Catholic) calendar and in the folk calendar; on the other hand, whether names of saints and/or holidays in Romanian cultural space can be found in other cultural spaces. Upon looking at names of saints and holidays over the year in the calendars mentioned above, sometimes we notice similarities or contaminations, whereas on other occasions we come across differences. We focus our attention on twelve saints, correlated with twelve holidays over the year, celebrated by Christians regardless of religious confession and cultural space. The regional names of the holidays from various Romanian ethnographic areas attest to their age. The complexity of this research is underpinned by our synchronic analysis and interdisciplinary perspective (linguistics, ethnology, religion, mythology), which also refers to identity-otherness relationships, eponyms, isotopies, synonymy and antinomy connections, contamination and multiculturalism in onomastics.
APA, Harvard, Vancouver, ISO, and other styles
10

Jia Yi, Xu, Ma Xu Bo, Shen Jing Wen, Liu Jia Yi, and Chen Yi Xue. "A New Method to Evaluate the Correlation Coefficients Between Nuclides in Uncertainty and Sensitivity Analysis." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66777.

Full text
Abstract:
Uncertainty and sensitivity analysis is an essential component of nuclear engineering calculations. Uncertainties in the cross-section input data directly affect uncertainties in the results. The covariance values between different types of cross-sections are considered in the NJOY covariance library. However, the correlation coefficient between isotopes can depend on the specific problem. The correlation coefficient between 235U and 238U in a pressurized water reactor (PWR) might be different from that in a fast reactor. In this study, a new Monte Carlo-based method is proposed for calculating this effect. The correlation coefficients between different isotopes are calculated using a problem-dependent fraction parameter. The correlation coefficients between the capture cross-sections of 235U, 238U, 239Pu, and 241Pu are calculated. The same method can be extended to other reaction types. The correlation coefficients as a function of the isotopic atomic density uncertainty and the average one-group microscopic cross-section uncertainty are also studied. It is shown that the correlation coefficients vary very little with the uncertainty in the average one-group microscopic cross-section. The correlation coefficient of an isotope pair changes slightly over the course of a cycle because of atomic density and microscopic cross-section changes.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Isotopies"

1

Hayes, John. An Introduction to Isotopic Calculations. Woods Hole Oceanographic Insitution, September 2004. http://dx.doi.org/10.1575/1912/27058.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kidder, J. A., M. B. McClenaghan, M I Leybourne, M. W. McCurdy, P. Pelchat, D. Layton-Matthews, C. E. Beckett-Brown, and A. Voinot. Geochemical data for stream and groundwaters around the Casino Cu-Au-Mo porphyry deposit, Yukon (NTS 115 J/10 and 115 J/15). Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328862.

Full text
Abstract:
This open file reports geochemical data for stream and groundwater samples collected around the Casino porphyry Cu-Au-Mo deposit, one of the largest and highest-grade deposits of its kind in Canada. The calc-alkaline porphyry is hosted in a Late Cretaceous quartz monzonite and associated breccias in the unglaciated region of west central Yukon. Water chemistry around the deposit was investigated because: (i) the deposit has not yet been disturbed by mining; (ii) the deposit was known to have metal-rich waters in local streams; and (iii) the deposit has atypically preserved ore zones. Stream water samples were collected at 22 sites and groundwater samples were collected from eight sites. Surface and groundwaters around the Casino deposit are anomalous with respect to Cd (up to 5.4 µg/L), Co (up to 64 µg/L), Cu (up to 1657 µg/L), Mo (up to 25 µg/L), As (up to 17 µg/L), Re (up to 0.7 µg/L), and Zn (up to 354 µg/L) concentrations. The stable isotopes of O and H of the groundwaters are essentially identical to the surface waters and plot close to the local and global meteoric water lines, indicating that the waters represent modern recharge, consistent with the generally low salinities of all the waters (total dissolved solids range from 98 to 1320 mg/L). Sulfur and Sr isotopes are consistent with proximal waters interacting with the Casino rocks and mineralization; a sulfide-rich bedrock sample from the deposit has delta-34S = -1.2 permille and proximal groundwaters are only slightly heavier (-0.3 to 3.1 permille). These geochemical and isotopic results indicate that surface water geochemistry is a suitable medium for mineral exploration for porphyry-style mineralization in the Yukon, and similar unglaciated regions in Canada. The atypical geochemical signature (Mo, Se, Re, As, Cu) of these types of deposits are typically reflected in the water chemistry and S isotopes provide a more local vectoring tool.
APA, Harvard, Vancouver, ISO, and other styles
3

Fitzsimmons, Jonathan. Fishing for isotopes in the Brookhaven Lab Isotope Producer (BLIP) cooling water. Office of Scientific and Technical Information (OSTI), April 2016. http://dx.doi.org/10.2172/1340357.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Jacques, I. J., A. J. Anderson, and S. G. Nielsen. The geochemistry of thallium and its isotopes in rare-element pegmatites. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328983.

Full text
Abstract:
The Tl isotopic and trace element composition of K-feldspar, mica, pollucite and pyrite from 13 niobium-yttrium-fluorine (NYF)-type and 14 lithium-cesium-tantalum (LCT)-type rare-element pegmatites was investigated. In general, the epsilon-205Tl values for K-feldspar in NYF- and LCT-type pegmatites increases with increasing magmatic fractionation. Both NYF and LCT pegmatites display a wide range in epsilon-205Tl (-4.25 to 9.41), which complicates attempts to characterize source reservoirs. We suggest 205Tl-enrichment during pegmatite crystallization occurs as Tl partitions between the residual melt and a coexisting aqueous fluid or flux-rich silicate liquid. Preferential association of 205Tl with Cl in the immiscible aqueous fluid may influence the isotopic character of the growing pegmatite minerals. Subsolidus alteration of K-feldspar by aqueous fluids, as indicated by the redistribution of Cs in K-feldspar, resulted in epsilon-205Tl values below the crustal average (-2.0 epsilon-205Tl). Such low epsilon-205Tl values in K-feldspar is attributed to preferential removal and transport of 205Tl by Cl-bearing fluids during dissolution and reprecipitation. The combination of thallium isotope and trace element data may be used to examine late-stage processes related to rare-element mineralization in some pegmatites. High epsilon-205Tl and Ga in late-stage muscovite appears to be a favorable indicator of rare-element enrichment LCT pegmatites and may be a useful exploration vector.
APA, Harvard, Vancouver, ISO, and other styles
5

Matte, S., M. Constantin, and R. Stevenson. Mineralogical and geochemical characterisation of the Kipawa syenite complex, Quebec: implications for rare-earth element deposits. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329212.

Full text
Abstract:
The Kipawa rare-earth element (REE) deposit is located in the Parautochton zone of the Grenville Province 55 km south of the boundary with the Superior Province. The deposit is part of the Kipawa syenite complex of peralkaline syenites, gneisses, and amphibolites that are intercalated with calc-silicate rocks and marbles overlain by a peralkaline gneissic granite. The REE deposit is principally composed of eudialyte, mosandrite and britholite, and less abundant minerals such as xenotime, monazite or euxenite. The Kipawa Complex outcrops as a series of thin, folded sheet imbricates located between regional metasediments, suggesting a regional tectonic control. Several hypotheses for the origin of the complex have been suggested: crustal contamination of mantle-derived magmas, crustal melting, fluid alteration, metamorphism, and hydrothermal activity. Our objective is to characterize the mineralogical, geochemical, and isotopic composition of the Kipawa complex in order to improve our understanding of the formation and the post-formation processes, and the age of the complex. The complex has been deformed and metamorphosed with evidence of melting-recrystallization textures among REE and Zr rich magmatic and post magmatic minerals. Major and trace element geochemistry obtained by ICP-MS suggest that syenites, granites and monzonite of the complex have within-plate A2 type anorogenic signatures, and our analyses indicate a strong crustal signature based on TIMS whole rock Nd isotopes. We have analyzed zircon grains by SEM, EPMA, ICP-MS and MC-ICP-MS coupled with laser ablation (Lu-Hf). Initial isotopic results also support a strong crustal signature. Taken together, these results suggest that alkaline magmas of the Kipawa complex/deposit could have formed by partial melting of the mantle followed by strong crustal contamination or by melting of metasomatized continental crust. These processes and origins strongly differ compare to most alkaline complexes in the world. Additional TIMS and LA-MC-ICP-MS analyses are planned to investigate whether all lithologies share the same strong crustal signature.
APA, Harvard, Vancouver, ISO, and other styles
6

Elam, K. R., and W. J. Reich. Determination of the theoretical feasibility for the transmutation of europium isotopes from high flux isotope reactor control cylinders. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/207579.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Li, T., J. Parker, Y. Kuno, K. Nakatsuka, K. Kaminaga, and T. Akiyama. Determination of plutonium concentration and isotopic compositions by isotope dilution gamma-ray spectroscopy on resin beads. Office of Scientific and Technical Information (OSTI), May 1990. http://dx.doi.org/10.2172/6856198.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Myhre, Kristian, Ethan Balkin, Draguna Vrabie, and Danda Rawat. Artificial Intelligence for Isotopes: Report on the 2022 Workshop on Artificial Intelligence for Isotope R&D and Production. Office of Scientific and Technical Information (OSTI), January 2023. http://dx.doi.org/10.2172/1909817.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Nielsen, D. L. Transportation of medical isotopes. Office of Scientific and Technical Information (OSTI), November 1997. http://dx.doi.org/10.2172/362356.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Author, Not Given. Isotopes: Products and services. Office of Scientific and Technical Information (OSTI), March 1989. http://dx.doi.org/10.2172/5992318.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Isotopies' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography