Bibliographies thématiques / Strontium (Sr)

Littérature scientifique sur le sujet « Strontium (Sr) »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 11 mars 2023

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Articles de revues sur le sujet "Strontium (Sr)"

Fujihara, Emi, Masayuki Kon et Kenzo Asaoka. « Strontium-Substituted Calcium Phosphate Cements Prepared with Strontium-Containing Solutions ». Key Engineering Materials 330-332 (février 2007) : 795–98. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.795.

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The purpose of this study was to determine if a strontium (Sr)-containing mixing liquid could be used as an exchanging agent for calcium phosphate cement crystallized with Sr-replacing hydroxyapatite (Sr-HAP). Alpha-tricalcium phosphate (α-TCP) powder was mixed with Srcontaining and phosphorous (P)-containing solutions, that is, SrCl2 or SrCl2+CaCl2 solution and NaH2PO4 or Na2HPO4 solution. After storage in the incubator for 7 days, the α-TCP crystals in all set cements were confirmed to have been transformed to HAP crystals by the mixing liquids. The XRD patterns of the set cements implied that the Sr-HAP could be precipitated by using Srcontaining solutions as the mixing liquid because of the chemical shift of a peak (002) in XRD of the HAP crystal. The solubility (shaking immersion in physiological saline) of set cements containing Sr was markedly higher than that of set cement not containing Sr. These results revealed that the Sr-containing solutions used as mixing liquids for α-TCP cement acted as precipitating agents for Sr-HAP. Sr-HAP-precipitating cement could be useful because of its pharmacological activity with high solubility.

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Okamoto, H. « Al-Sr (Aluminum-Strontium) ». Journal of Phase Equilibria & ; Diffusion 26, n^o 4 (1 août 2005) : 394. http://dx.doi.org/10.1361/154770305x56926.

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Okamoto, H. « Ge-Sr (Germanium-Strontium) ». Journal of Phase Equilibria & ; Diffusion 27, n^o 5 (1 octobre 2006) : 547. http://dx.doi.org/10.1361/154770306x136629.

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Okamoto, H. « Si-Sr (Silicon-Strontium) ». Journal of Phase Equilibria & ; Diffusion 27, n^o 2 (1 avril 2006) : 204. http://dx.doi.org/10.1361/154770306x97768.

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Okamoto, H. « Sn-Sr (Tin-Strontium) ». Journal of Phase Equilibria & ; Diffusion 27, n^o 2 (1 avril 2006) : 205–6. http://dx.doi.org/10.1361/154770306x97786.

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Okamoto, H. « Al-Sr (Aluminum-Strontium) ». Journal of Phase Equilibria and Diffusion 26, n^o 4 (octobre 2005) : 394. http://dx.doi.org/10.1007/s11669-005-0099-z.

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Okamoto, H. « Si−Sr (Silicon-Strontium) ». Journal of Phase Equilibria and Diffusion 27, n^o 2 (mars 2006) : 204. http://dx.doi.org/10.1007/s11669-006-0065-4.

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Okamoto, H. « Sn−Sr (Tin-Strontium) ». Journal of Phase Equilibria and Diffusion 27, n^o 2 (mars 2006) : 205. http://dx.doi.org/10.1007/s11669-006-0066-3.

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Okamoto, H. « Ag-Sr (Silver-Strontium) ». Journal of Phase Equilibria and Diffusion 28, n^o 6 (2 novembre 2007) : 594. http://dx.doi.org/10.1007/s11669-007-9188-5.

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Okamoto, H. « Sr-Zn (Strontium-Zinc) ». Journal of Phase Equilibria and Diffusion 29, n^o 1 (14 novembre 2007) : 127. http://dx.doi.org/10.1007/s11669-007-9235-2.

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Thèses sur le sujet "Strontium (Sr)"

El, Meknassi Sofia. « Enregistrement des isotopes du Sr dans les coquilles et l'eau de mer côtière : réévaluation multi-échelles du cycle du Sr pour des implications paléoenvironnementales et chimiostratigraphiques ». Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30200.

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Les reconstitutions passées de la composition isotopique en Sr (87Sr/86Sr) des squelettes carbonatés d'organismes marins (MCS) sont très largement utilisées par les chimiostratigraphes et les paléoenvironnementalistes car elles permettent de reconstituer les variations du rapport 87Sr/86Sr de l'océan au cours des temps géologiques. Les reconstitutions paléoenvironnementales et les datations chimiostratigraphiques reposent sur le consensus que les MCS précipitent leurs tests carbonatés à l'équilibre isotopique avec l'eau de mer qui est homogène à l'échelle globale en raison d'un temps de résidence du Sr (2 Ma) supérieur au temps de brassage océanique (1600 ans). Leur fiabilité en tant qu'outils chimiostratigraphiques peut être remise en question, notamment parce qu'aucune évaluation formelle des biais biologiques et environnementaux n'a été réalisée à l'échelle mondiale. Cette étude propose donc une réévaluation à l'échelle globale de la signature isotopique en Sr des MCS et de l'eau de mer d'environnements côtiers. La signature isotopique des MCS et de l'eau côtière est largement influencée par des apports continentaux qui peuvent modifier les signatures isotopiques de ces derniers. De fait, au vu de ces hétérogénéités cette étude a recalculé le temps de résidence du Sr à plusieurs échelles spatiales. Elle propose de façon générale une meilleure compréhension des processus côtiers sur la signature isotopiques de l'eau et des MCS
Past reconstructions of the isotopic Sr composition (87Sr / 86Sr) of marine carbonate skeletons (MCS) are very widely used by chemostratigraphs and palaeoenvironmentalists because they allow to reconstruct variations of the 87Sr/86Sr ratio of the ocean across geological time. Paleoenvironmental reconstructions and chemostratigraphic dating are based on the consensus that MCS precipitate their carbonate skeletons at the isotopic equilibrium with surrounded seawater, that is considered as homogeneous at global scale due to a residence time of Sr (2 Ma) higher than the global ocean mixing duration(1600 years). Their reliability as chemostratigraphic tools can therefore be questioned, in particular because no formal evaluation of biological and environmental biases has been carried out at a global scale. This study proposes a global reassessment of the Sr isotopic composition of both MCS and seawater of coastal and oligotrophic environments. The isotopic signature of MCS and coastal water is largely influenced by continental inputs that can modify their isotopic signatures. In fact, given these heterogeneities, this study has recalculated the Sr residence time. Finally, this study propose a better understanding of the global strontium cycle at different time scale

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Dennebouy, Stéphane. « Mise en évidence et caractérisation de la variabilité haute fréquence du rapport 87 Sr / 86 Sr du strontium océanique ». Paris, ENMP, 2001. http://www.theses.fr/2001ENMP1102.

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Dennebouy, Stéphane. « Mise en évidence et caractérisation de la variabilité haute fréquence du rapport ⁸⁷Sr : ⁸⁶Sr du strontium océanique / ». Paris : École des mines de Paris, Centre de géotechnique et d'exploitation du sous-sol - sédimentologie, 2002. http://catalogue.bnf.fr/ark:/12148/cb391803290.

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Avila, Teresa D. « Seafloor weathering and the Middle to Late Ordovician seawater ⁸⁷Sr/⁸⁶Sr inflection point preserved in conodont apatite ». The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1565961269717394.

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Borkar, Hemant. « Texture and microstructure on magnesium-magnase-strontium (Mg-Mn-Sr) extrusion alloys ». Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114461.

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Wrought Mg alloys have received increasing attention for automotive body applications for the past few years due to their potential for weight reduction. The Mg-1%Mn (M1) alloy is one of the few conventional Mg alloys that may offer good formability; however, its low strength is a major concern. One disadvantage of most extruded Mg alloys is their crystallographic orientation which influences formability. The extrusion of Mg alloys gives strong final texture where basal planes align with the extrusion axis resulting in tensile-compressive yield asymmetry. It has been experimentally established that the addition of rare earth (RE) elements such as Ce and Nd to Mg alloys weakens the texture and improves the formability in both extrusions and in rolled materials. Sr, an effective grain refiner, forms a phase diagram with Mg, which is similar to Mg-RE phase diagrams. Furthermore, unlike REs, Sr forms second phases that are thermally stable due to the negligible solubility of Sr in Mg at elevated temperatures. Hence, Mg-Sr second phases are expected to be more effective than REs in nucleating recrystallization and in potentially weakening the texture. This research was focused on developing new extrusion alloy compositions based on the Mg-Mn-Sr alloy system. The objective was to investigate the effect of Sr on the properties of extruded Mg-1Mn alloys by studying the microstructure and texture evolution of extruded Mg-Mn-Sr alloys and by detecting the role of precipitates in the mechanisms of dynamic recrystallization during extrusion. First, the effect of Sr addition on hot deformation characteristics and texture evolution of Mg-1Mn (M1) alloy, via hot compression tests at 400 ºC and 0.1/s strain rate was studied. Flow curves of M1 and M1-Sr alloys showed softening behavior indicating dynamic recrystallization (DRX). The texture of M1 alloy after hot compression was strong basal in nature but it weakened with increasing Sr additions. The second part of the research focused on the effect of Sr (up to 2.1 wt %) on the texture and mechanical properties of M1 alloy extruded at 350 °C.M1-Sr alloys showed weakened texture by developing random texture components during extrusion. The texture randomization was attributed to particle stimulated nucleation (PSN) around Mg-Sr intermetallics during recrystallization. M1-Sr compositions were found to show improved strength and ductility as well as reduced yield asymmetry. In the final part of the study, effect of extrusion parameters on texture evolution, recrystallization and mechanical properties of extruded alloys was analyzed. M1-1.6Sr alloy developed weaker textures at all extrusion temperatures 300 °C, 350 °C and 400 °C as a result of PSN. In second sub-section, three alloys M1, M1-1.3Sr and M1-2.1Sr were subjected to different extrusion temperatures and extrusion speeds. The three extrusion temperatures of 300 °C, 350 °C and 400 °C and two ram speeds of 4 mm/s and 8 mm/s were used at constant extrusion ratio of 7. M1 exhibited strong basal texture under some conditions especially after extrusion at higher speed and at 350 °C and 400 °C. At 350 °C and 400 °C, grain boundary bulging is major recrystallization mechanism in alloy M1 while it occurs in combination with PSN in M1-Sr alloys. Yield symmetry and ductility were found to be dependent on combination of several factors including grain size, extent of recrystallization and texture. At selected extrusion parameters, M1-Sr alloys had weaker textures, improved strength, higher ductility and reduced yield asymmetry. The final task in this phase was the industrial extrusion trials at the Industrial Partner's extrusion plant in Mexico. The optimum alloy compositions in both cases (lab-scale and industrial) were the same at 350 °C i.e, Mg-1Mn-2.1Sr.
Les alliages de magnésium pour l'extrusion ont reçu une attention toute particulière au cours des dernières années pour ce qui a trait aux applications automobiles étant donné leur potentiel pour la réduction de poids. L'alliage de Mg-1%Mn (M1) offre une bonne formabilité, cependant, la faible résistance offerte par cet alliage est un problème majeur. L'extrusion des alliages de magnésium démontre une texture finale avec des plans de base alignés avec l'axe d'extrusion qui ainsi résulte dans une asymétrie des propriétés de tension et de compression. Il a été démontré expérimentalement que des additions de terres rares telles que Ce et Nd aux alliages de magnésium affaiblissent la texture et améliorent la formabilité pour l'extrusion et le laminage. Le strontium (Sr) qui est un affineur de grains utile possède un diagramme de phase similaire aux autres éléments des terres rares et est présumé avoir le même effet dans les alliages de Mg-Mn. Ce travail de recherche a été orienté vèrs le développement de nouvelles compositions d'alliages de magnésium basées sur le système Mg-Sr. L'objectif de ce projet a été d'analyser l'effet du Sr sur le comportement des alliages lors de l'extrusion et les propriétées des alliages de Mg-1Mn. Cet effet a été étudié par l'analyse de la microstructure et l'évolution de la texture lors de l'extrusion des échantillons d'alliages Mg-Mn-Sr et par la détection du rôle des précipités dans les mécanismes de recristallisation dynamique lors de l'extrusion. Ce travail a été suivi par l'étude de l'effet des additions de strontium sur les caractéristiques de la déformation à chaud et l'évolution de la texture de l'alliage Mg-1Mn (M1). Ceci a été analysé par la réalisation d'essais de compression à chaud effectués à 400 ºC et à une vitesse d'allongement de 0.1mm/s. La texture de l'alliage M1 après l'essai de compression à chaud était de type basale mais affaiblie lors de l'augmentation des additions de Sr.Dans la seconde partie de ce travail de recherche, l'effet de l'addition de Sr jusqu'à 2% poids sur la texture et sur les propriétées mécaniques de l'alliage M1 après extrusion a été étudié. L'extrusion a été effectuée à une température de 350 ºC. Les alliages M1-Sr ont montré un affaiblissement de la texture par le développement de composés avec une texture aléatoire lors de l'extrusion. La variation aléatoire de la texture a été attribuée à la stimulation des particules de nucléation autour des composés intermétalliques Mg-Sr au cours de la recristallisation. Les compositions M1-Sr ont été celles qui ont montré une augmentation de la force de résistance et aussi de la ductilité ainsi que la réduction du cédage asymétrique. Dans la dernière partie de cette étude l'effet de la température d'extrusion sur l'évolution de la texture et la recristallisation des alliages M1 et M1-1.6Sr a été analysé. L'alliage M1 a montré une texture plus faible après l'extrusion à 300 ºC, mais a développé une structure basale forte à 350 et 400 ºC. L'alliage M1-1.6Sr a développé des textures plus faibles à toutes les températures d'extrusion et ceci a donné comme résultat une formation préférentielle de PSN à cause des composés intermétalliques Mg-Sr qui ont formé des grains avec des orientations aléatoires.Dans la dernière partie de l'étude, l'effet des paramètres d'extrusion sur évolution de la texture, recristallisation et les propriétés mécaniques des alliages extrudés a été analysée. M1-Sr alliages eu les plus faibles, des textures résistance améliorée, une plus grande ductilité et un rendement réduit l'asymétrie. La dernière tâche de cette phase était l'extrusion industrielle des alliages M1-Sr à l'usine d'extrusion du partenaire industriel au Mexique.Les compositions d'alliage optimales dans les deux cas (l'échelle du laboratoire et industriel) étaient les mêmes à 350 °C i.e, Mg-1Mn-2.1Sr.

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Ward, Brittany Marie. « Reconstruction of Holocene coupling between the South America Monsoon System and local moisture variability from speleothem δ¹⁸O and ⁸⁷Sr/⁸⁶Sr records : ». Thesis, Boston College, 2018. http://hdl.handle.net/2345/bc-ir:108373.

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Thesis advisor: Corinne I. Wong
Investigating controls on past variability of South American hydroclimate is critical to assessing its response to future warming scenarios. δ¹⁸O records from South America offer insight into past variability of the South American Monsoon System (SAMS). The controls on precipitation δ¹⁸O values, however, can be decoupled from precipitation amount and thereby limit investigations of variability in local moisture conditions. Here we use a principle components analysis to assess the coherence of speleothem and lake core Holocene δ¹⁸O records in tropical South America to evaluate the extent to which δ¹⁸O variability reflects changes in SAMS intensity at different sites across the region. The main mode of variability across Holocene δ¹⁸O records (PC1) closely tracks austral summertime insolation, consistent with existing work. PC1 is strongly expressed at sites towards the periphery of the continent, while variability at interior sites bear little similarity that implicates controls, in addition to monsoon intensity, on these δ¹⁸O records. Further, we develop speleothem ⁸⁷Sr/⁸⁶Sr records spanning the Holocene from Tamboril Cave (Brazilian Highlands), Paraíso Cave (eastern Amazon Basin), Jaraguá Cave (Mato Grosso Plateau), and Botuverá Cave (Atlantic coastal plain) to investigate coupling between reconstructed monsoon variability and local moisture conditions. Speleothem ⁸⁷Sr/⁸⁶Sr variability is interpreted as a proxy of local moisture conditions, reflecting the degree of water-rock interaction with the cave host rock as driven by variations in water residence time. Speleothem ⁸⁷Sr/⁸⁶Sr records from all the sites, except Botuverá cave, do not co-vary with PC1, suggesting that local moisture conditions do not necessary follow variations in monsoon intensity at these interior sites. These speleothem ⁸⁷Sr/⁸⁶Sr records, however, generally suggest dry mid-Holocene conditions, consistent with interpretations of other paleo-moisture records in the region. These results highlight that dynamics, in addition to SAMS variability, might influence δ¹⁸O variability as well as local moisture conditions at interior sites, and highlight the need for δ¹⁸O-independent reconstructions of moisture conditions
Thesis (MS) — Boston College, 2018
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences

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Porter, Courtney. « Solute Inputs to Soil and Stream Waters in a Seasonally Snow-Covered Mountain Catchment Determined Using Ge/Si, ⁸⁷SR/⁸⁶SR and Major Ion Chemistry : Valles Caldera, New Mexico ». Thesis, The University of Arizona, 2012. http://hdl.handle.net/10150/265377.

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Weathering releases lithogenic elements to soil and stream waters that support life in catchment ecosystems. Seasonal and inter-annual variations in hydrologic conditions change subsurface flowpaths, modifying the influence of weathering on stream waters. This study, over two climatically variable years, determined seasonal and inter-annual changes in solute sources to streams using a multi-tracer approach including major cations, strontium isotopes, germanium (Ge)/silica ratios, carbon species, and trace metals. Stream water cations display constant concentrations although discharge response was highly variable, suggesting that there is a consistent subsurface water supply. However, Sr isotope ratios, and concentrations of Ge, Fe, Al, and dissolved organic carbon, which originate from shallow soil waters, increase with the hydrograph during a wet winter snowmelt. This indicates that during a year with a thick snowpack, stream waters contain components of both shallow soilwater and groundwater during snowmelt, whereas during all other times groundwater contributes predominantly to the stream.

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Bouchard, Laurianne. « Rb-Sr Age Estimates of Pore Fluids in Sedimentary Rocks, DGR Site, Kincardine, Ontario ». Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32271.

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This study is part of a project aiming for the long-term burying of nuclear wastes in Kincardine, Ontario. Bedrock formations as well as their associated waters were analyzed in drill cores from the Michigan sedimentary basin, southwest Ontario. This research utilizes geochemistry combined to strontium and rubidium isotope ratios in order to determine the origin of porewaters from Ordovician shales and limestones. It is demonstrated that these waters are the result of a mixing line between the Silurian (Guelph) and Cambrian groundwaters. This last end-member was also mixed with Precambrian brines to some extent. Strontium and rubidium isotopes also demonstrated rubidium in clays were leached by porewaters over time. Once in solution, radioactive rubidium decayed into strontium over time. This process explains the accumulation of radiogenic strontium observed in porewaters. An age estimate for the deposition of carbonates and other evaporates was calculated with the Rb-Sr isotope system. The calculated age is 453.7 million years before present for dolomites, which is consistent with the history of the site. It was possible to gen an approximate age of 339.7 million years for the formation of illites. This corresponds to the illitization process that occurred after the deposition of rocks, when the Silurian brines infiltrated the deeper Ordovician shale. It was also possible to estimate of porewaters ages.

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Herman, Staci. « Isolation and Fate of Sr-90 in a High-Calcium, Post-Detonation Matrices ». University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1554121065195439.

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MARTINELLI, ANTONIO E. « Efeito da adicao de chumbo na formacao de fases supercondutoras em ceramicas de Bi-Sr-Ca-Cu-O ». reponame:Repositório Institucional do IPEN, 1991. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10260.

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Livres sur le sujet "Strontium (Sr)"

Duane, M. J. Pb and Sr isotopic characteristics of Proterozoic Pb-Zn and Au deposits, Transvaal sequence, South Africa : Suggestions for their source areas and genesis. Johannesburg : University of the Witwatersrand, 1988.

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Lyon, Kenneth E. Retention of ¹³⁷Cs and ⁹⁰Sr by mineral sorbents surrounding vitrified nuclear waste. Ottawa, Canada : National Hydrology Research Institute, Inland Waters Directorate, 1985.

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Blokdijk, G. J. Strontium Chloride Sr-89 ; Complete Self-Assessment Guide. Createspace Independent Publishing Platform, 2018.

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Geochronologische, geochemische, petrographische und mineralogische Untersuchungen im Grundgebirge Bayerns sowie kritische Betrachtungen zu Sr-Isotopenstandards. Augsburg : Bayerisches Landesamt für Umwelt, 2008.

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Martin-Bandin, Fernando. Environmental assessment of soils contaminated with ₂₃₈U and/or ₉₀Sr via scintillation technology : Fernald Incinerator Site- a case study. 1995.

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Baik, Seung-Hyuk. Determination of ⁹⁰Sr/⁹⁰Y contamination using beta-particle spectroscopy with active gamma-ray discrimination. 1991.

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Chapitres de livres sur le sujet "Strontium (Sr)"

Ross, Robert B. « Strontium Sr ». Dans Metallic Materials Specification Handbook, 582. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3482-2_46.

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MacIntyre, Jane E. « Sr Strontium ». Dans Dictionary of Organometallic Compounds, 276. Boston, MA : Springer US, 1996. http://dx.doi.org/10.1007/978-1-4899-6848-7_53.

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Nagy, Zoltán. « Sr—Strontium ». Dans Electrochemical Synthesis of Inorganic Compounds, 424. Boston, MA : Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-0545-1_62.

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Macintyre, J. E., F. M. Daniel, D. J. Cardin, S. A. Cotton, R. J. Cross, A. G. Davies, R. S. Edmundson et al. « Sr Strontium ». Dans Dictionary of Organometallic Compounds, 211. Boston, MA : Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-4966-3_54.

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Predel, B. « As-Sr (Arsenic - Strontium) ». Dans Ac-Ag ... Au-Zr, 1. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/10793176_200.

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Predel, B. « Al-Sr (Aluminum - Strontium) ». Dans Ac-Ag ... Au-Zr, 1–3. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/10793176_123.

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Franke, P., et D. Neuschütz. « Al-Sr (Aluminium - Strontium) ». Dans Binary Systems. Part 5 : Binary Systems Supplement 1, 1–3. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-45280-5_26.

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Sanz, Joaquim, Oriol Tomasa, Abigail Jimenez-Franco et Nor Sidki-Rius. « Strontium (Sr) [Z = 38] ». Dans Elements and Mineral Resources, 205–7. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85889-6_51.

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Sukhoruchkin, S. I., et Z. N. Soroko. « Graphs for 38-Sr (Strontium) ». Dans Nuclei with Z = 1 - 54, 8135–42. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-69945-3_3524.

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Sukhoruchkin, S. I., et Z. N. Soroko. « Excited Nuclear States for Sr-76 (Strontium) ». Dans Supplement to I/25 A-E, 2092–93. Berlin, Heidelberg : Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47801-1_302.

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Actes de conférences sur le sujet "Strontium (Sr)"

Vuchkov, N. K., et D. N. Astadjov. « Strontium recombination laser ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cthq4.

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The IC-excitation that had been developed in our lab has been applied very successfully in the excitation of CuBr vapor laser.1 The power and efficiency of CuBr vapor lasers have been increased by a factor of 1.5-1.7. In the present work we present the examination of IC-excitation for Sr+ laser.

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Vazquez, Rene A., M. D. Ewbank, R. R. Neurgaonkar et W. K. Cory. « Photorefractive properties of doped strontium barium niobate ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wl38.

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Photorefractive strontium barium niobate (Sr x Ba1- x Nb2O6 or SBN) is an attractive material for photorefractive applications because of its large r33 electrooptic coefficient. One attractive feature of the tungsten bronze structure of SBN is the large number of vacant lattice sites which can be occupied by dopants to provide a high density of photorefractive charge carriers.

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Chan, Y. C., et J. A. Gelbwachs. « Asymmetry in the pressure-broadened strontium resonance line induced by rare gas perturbers ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.mkk6.

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The spectral lineshapes of the Sr (51P1–51P0) resonance transition perturbed by rare gases have been examined with a high-resolution laser-induced fluorescence method. In He and Ne, the collisional broadened spectral profiles are found to be symmetrical over the entire studied pressure range (0–600 Torr). The resulting line shapes are accurately represented by a simple Voigt profile expression. The Ar, Kr, and Xe perturbing gases, however, produce anomalous asymmetrical line broadening. To our knowledge, this represents the first measurement of asymmetrical broadening in the near wings of the emission profiles of the Sr-rare gas systems. Quantitative comparisons of the measured and theoretical line asymmetries suggest that atomic interactions in the Sr-rare gas systems are not entirely due to van der Waals (R-6)-type interactions. The line asymmetries could be caused by the correlations between thermal motions of the Sr atoms and collisional interactions.

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Goossen-Schmidt, Nora, Christoph Pyrlik, Muhammad Tehwar Hassan, Ahmad Bawamia, Jörg Fricke, Andrea Knigge, Andre Maaßdorf, Max Schiemangk, Hans Wenzel et Andreas Wicht. « Distributed Bragg Reflector Lasers at 689.45 nm for Sr Spectroscopy ». Dans CLEO : Applications and Technology. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.am2d.2.

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We present distributed Bragg reflector lasers optimized for strontium-based quantum technology applications at 689.449 nm. The devices achieved optical output powers up to 88 mW, four times more than previously reported, and a spectral linewidth of 0.4MHz.

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Ravichandran, Jayakanth, Wolter Siemons, Justin Kardel, Herman Heijmerikx, Arvind Chari, Dongwook Oh, David Cahill, Ramamoorthy Ramesh et Arun Majumdar. « Thermoelectricity of Double Doped Strontium Titanate ». Dans 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22352.

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Lanthanum (La) doped Strontium Titanate (SrTiO3) is amongst the most promising n-type thermoelectric materials for power generation. We report a double doping method for thin films of SrTiO3 (STO), grown by Pulsed Laser Deposition (PLD), where doping of STO in the Sr-site by Lanthanum is accompanied by doping with oxygen vacancies. In the past theoretical predictions have shown that introducing oxygen vacancies in STO produces a high-effective mass defect band just below the conduction band edge, explaining the high seebeck coefficient observed in oxygen deficient STO. Based on careful transport measurements, we show that it is possible to obtain enhanced thermoelectric power factor by double doping, using La and oxygen vacancies in these thin films. With the aid of optical spectroscopic measurements, we establish the presence of the impurity band created by the vacancies and validate their role in the enhanced thermoelectric performance with structural and transport measurements. The presence of oxygen vacancies also serves to decrease the thermal conductivity due to effective phonon scattering.

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Law, Jack, Dean Peterman, Cathy Riddle, David Meikrantz et Terry Todd. « Advances in Development of the Fission Product Extraction Process for the Separation of Cesium and Strontium From Spent Nuclear Fuel ». Dans The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7077.

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The Fission Product Extraction (FPEX) Process is being developed as part of the United States Department of Energy Advanced Fuel Cycle Initiative for the simultaneous separation of cesium (Cs) and strontium (Sr) from spent light water reactor (LWR) fuel. Separation of the Cs and Sr will reduce the short-term heat load in a geological repository, and when combined with the separation of americium (Am) and curium (Cm), could increase the capacity of the geological repository by a factor of approximately 100. The FPEX process is based on two highly specific extractants: 4,4',(5')-Di-(t-butyldicyclo-hexano)-18-crown-6 (DtBuCH18C6) and Calix[4]arene-bis-(tertoctylbenzo-crown-6) (BOBCalixC6). The DtBuCH18C6 extractant is selective for strontium and the BOBCalixC6 extractant is selective for cesium. Results of flowsheet testing of the FPEX process with a simulated feed solution in 3.3-cm centrifugal contactors are detailed. Removal efficiencies, distribution coefficient data, coextraction of metals, and process hydrodynamic performance are discussed along with recommendations for future flowsheet testing with actual spent nuclear fuel.

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Bhandari, Rajendra, Joyanto Routh, Kuo-Fang Huang et Subodh Sharma. « STRONTIUM (SR) AND NEODYMIUM (ND) ISOTOPIC COMPOSITIONS OF RIVERS DRAINING CONTRASTING LITHOLOGIES FROM NEPAL HIMALAYA ». Dans GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-380061.

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Dmitriev, Serge A., Olga K. Karlina, Vsevolod L. Klimov, Micheal I. Ojovan, Galina Yu Pavlova et Andrew Yu Yurchenko. « Retention Properties of Carbide-Corundum Ceramics Containing Carbon-14, Caesium-137, and Strontium-90 ». Dans ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4567.

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The system C–Al–TiO2 is of considerable interest for the processing of irradiated reactor graphite waste with the retention of biologic hazardous carbon-14. Investigations of this system were conducted both theoretically and experimentally. Previously, the thermodynamic calculations of the phase composition of resulting end product were performed for a wide variety of components content in the system being investigated. These simulation results have been supported by XRD-analysis of produced specimens. The experimental processing of reactor graphite was conducted by the use of self-sustaining reactions in C–Al–TiO2 mixtures. A search of modifier additives was performed to perfect end product properties. Test specimens were produced by mass ranging from 0.2 to 3 kg in the argon atmosphere. Various techniques were applied to characterize the produced specimens. The compressive strength of specimens of doped carbide-corundum matrices synthesized ranged from 7 to 18 MPa. The carry over of Cs-137 and Sr-90 during synthesis reaction was about 3% wt. The leachability attained of Cs-137 and Sr-90 from specimens was around 10−5 g/(cm2.day). The carbon-14 is combined in the end product in chemically and thermic stable titanium carbide. The carry-over of the carbon combined in carbon monoxide from the reacting mixtures during exothermic process was less than 1% wt. This corresponds roughly to up 0.01% wt. of the carbon-14 inventory, which can be present in the irradiated reactor graphite.

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Chen, Xi, Ying Zhou et Graham Shields. « An improved normalized seawater strontium isotope curve based on an updated compilation of Precambrian seawater ⁸⁷Sr/⁸⁶Sr ». Dans Goldschmidt2021. France : European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5430.

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Zieliński, Mateusz, Jolanta Dopieralska, Zdzislaw Belka, Sylwia Królikowska-Ciągło et Aleksandra Walczak. « Anthropogenic impact on environmental strontium isotope signatures (⁸⁷Sr/⁸⁶Sr) in Poland : implications for archaeological provenance and migration research ». Dans Goldschmidt2021. France : European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.3065.

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