Dissertations / Theses on the topic 'Sm3+ IONS'
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MAKHLOGA, ASHISH, and VIDESH KUMAR. "Sm3+ IONS DOPED BOROSILICATE GLASS FOR VISIBLE PHOTONIC DEVICE APPLICATIONS." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18625.
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An intense reddish-orange colour radiating Samarium doped Aluminium Calcium
borosilicate (BSACS) glasses were synthesized with the help of the melt-quench method to
analyze the photoluminescence properties using characterization methods like XRD, FT-IR,
photoluminescence (PL) excitation, PL emission, and PL decay. XRD and FT-IR reveal the
non-crystalline behavior along with the presence of numerous functional groups in BSACS
host glass correspondingly. Under 402 nm excitation, three major peaks were found in the
emission spectra which perfectly resembles to 4G5/2 → 6H5/2 (562 nm), 4G5/2 → 6H7/2 (599
nm), and 4G5/2 → 6H9/2 (646 nm) transitions of Samarium ions. 4G5/2 → 6H9/2 transition at 599
nm is comparatively more intense and noticeable. PL decay observed for 4G5/2 state reveals
the exponential nature in which curves are fitted by using bi-exponential and tri- exponential
fitting to assess the practically measured lifetimes (τexp). It is observed that the τexp values are
decreasing with increasing Samarium ion concentration due to the cross-relaxation energy
transference. All of the findings indicate that Sm3+ doped borosilicate glass is suitable for its
usage in visible reddish orange photonic devices.
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Sharples, Joseph William. "Cooling rapidly and relaxing slowly with 4f ions." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/cooling-rapidly-and-relaxing-slowly-with-4f-ions(fab0aa0f-1ab7-4016-9d97-5edf6a629fa8).html.
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Anisotropic magnetic materials have been proposed over the past twenty years or so as candidates for high density storage, so-called Single-Molecule Magnets (SMMs). These may in future be used to store data at the level of an individual molecule. Separately, isotropic materials may be harnessed for their large magnetocaloric effect which enables them to be used as refrigerants. This can potentially replace the increasingly rare and therefore expensive 3He and 4He currently employed either separately or in 3He-4He dilution refrigerators. This thesis examines the use of lanthanide(III) ions for these applications, by detailing the synthesis, characterisation and performance of three new classes of zero-dimensional compounds, {LnIII2}, {LnIII2ZnII4} and {LnIII7}. These are assessed by several techniques including SQUID magnetometry, heat capacity measurements luminescence spectroscopy, Electron Paramagnetic Resonance and ab initio calculations. In doing so we extended the use of a tripodal ligand widely employed in 3d chemistry to 4f ions, and found only the second 3d-4f phosphonate SMM. Investigating several members of a known three-dimensional lanthanide(III) polymer, {LnIII}n, showed the isotropic gadolinium(III) analogue is one of the very best of all known magnetic refrigerants in the low-temperature regime.
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Schick, Joachim. "Traitement d'effluents aqueux pollués par des ions nitrate ou phosphate ou des hydrocarbures de type BTEX : utilisation d'une zéolithe naturelle modifiée (SMZ) ou de zéolithes synthétiques." Thesis, Mulhouse, 2010. http://www.theses.fr/2010MULH3991.
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Ce travail s'inscrit dans le cadre de la protection de l'environnement et s'intéresse spécifiquement à la dépollution d'effluents aqueux en vue de piéger d'une part les anions nitrate et/ou phosphate, responsables du phénomène d'eutrophisation, mais également le toluène, hydrocarbure couramment rencontré dans les effluents aqueux urbains et industriels ou les eaux naturelles. Le piégeage de ces polluants a été effectué sur des matériaux zéolithiques. Une grande partie des expérimentations utilise un matériau potentiellement efficace pour le piégeage des trois polluants cités plus haut, à savoir la SMZ ("Surfactant-Modified Zeolite"), classiquement préparée à partir d'une zéolithe naturelle, la clinoptilolite, et d'un tensioactif, le bromure d'hexadecyltriméthylammonium (HDTMA+). En piégeage d'ions nitrate, d'autres SMZ, réalisées à partir de zéolithes synthétiques (LTA, FAU) et diverses espèces organiques tensioactives ou non se montrent moins performantes que la SMZ classique, à l'exception d'un nouveau matériau préparé à partir de nanofeuillets de zéolithe MFI et modifié avec l'ion HDTMA+ (SMZN). Pour le piégeage des ions phosphate, les performances de la SMZ classique ont été comparées à celles de plusieurs zéolithes calciques. Enfin, le piégeage de toluène a été expérimenté sur quatre matériaux, la SMZ classique, un charbon actif et deux zéolithes hydrophobes, la silicalite-1 et la zéolithe bêta. Les expérimentations de piégeage ont été réalisées en système fermé ou en système ouvert. L'influence de la concentration initiale en polluants, du rapport liquide/solide, du débit de filtration, de la présence de compétiteurs et du temps de contact a été examinéeThis work concerns the environmental protection, specifically the treatment of aqueous effluents. Effluents containing nitrate and/or phosphate anions, responsible for the eutrophication phenomenon, and also toluene, which is commonly found in urban and industrial flows and natural waters, were specifically studied. The removal of these pollutants was performed on zeolitic materials. A large part of the experiments use a material potentially efficient to remove the three pollutants mentioned above, namely the SMZ ("Surfactant-Modified Zeolite"), conventionally prepared from a natural zeolite, clinoptilolite, and a surfactant, hexadecyltrimethylammonium bromide (HDTMA+). For nitrate removal, other SMZ, prepared from synthetic zeolites (LTA, FAU) and various organic species (surfactant or not) were less efficient than conventional SMZ except a new material prepared from zeolite MFI nanosheets and modified with HDTMA+ ion. The efficiency of the conventional SMZ for the phosphate ions uptake was compared with those of several calcic zeolites. Finally, removal of toluene was performed on four materials, conventional SMZ, an activated carbon and two hydrophobic zeolites, namely silicalite-1 and beta zeolite. Uptake experiments were conducted in batch-wise and fixed-bed column systems, the second representing a more realistic simulation of dynamic field condition The influence of the initial pollutant concentration, the liquid/solid ratio, the filtration rate, the presence of competitive species and the contact time was examined
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Rabli, Djamal. "Extension de la méthode du potentiel modèle pour traiter la dynamique des systèmes moléculaires à couches ouvertes : applications : au transfert de charge dans les collisions entre Si3+ et He et entre He2+ et He métastable, à la détermination des potentiels adiabatiques Li2." Paris 6, 2001. http://www.theses.fr/2001PA066564.
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Wang, Gang. "CORRELATIONS RELATIVE TO THE REACTION PLANE AT THE RELATIVISTIC HEAVY ION COLLIDER BASED ON TRANSVERSE DEFLECTION OF SPECTATOR NEUTRONS." Kent State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=kent1144770985.
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Eerola, Isabelle, and Felicia Wahlén. "Emojier – Ett lingua franca för den digitala tidsåldern : men hur användbart är det egentligen?" Thesis, Högskolan Kristianstad, Fakulteten för ekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-19534.
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Emojier har kommit att bli en stor del i hur vi interagerar med varandra, både online och offline och dagligen innehåller närmare 40 procent av alla sms i västvärlden en eller flera emojier. 2009 valde Unicode Consortium att implementera emojier i sin standard och därefter valde Apple som första kommersiella företag att lägga till emojier i sitt tangentbord. Tidigare undersökningar har delade meningar om huruvida det är en skillnad i användandet av emojier mellan yngre och äldre åldersgrupper. Forskningen har främst fokuserat på användningen av emojier online i sociala kanaler, därav finns det bristfällig forskning om hur emojier upplevs i en interaktion som sker offline. Syftet med denna studie är att undersöka hur emojier upplevs offline via sms i iOS gränssnitt av emojier, detta görs genom en jämförelse mellan två åldersgrupper: 20–30 år samt 50–60 år. Studien har också syftet att undersöka möjliga förbättringar till iOS gränssnitt av emojier för att främja god användbarhet. Studiens kvalitativa ansats innebär ostrukturerade observationer och semi-strukturerade intervjuer. Resultaten visar på både likheter och skillnader mellan åldersgrupperna om hur de upplever emojier i en interaktion som sker via sms. Det framkommer också brister i användningen av gränssnittet som motverkar en god användbarhet där informanterna får ge förslag till en förbättring av gränssnittet.Emojis have become a major part of how we interact with each other, online as well as offline and almost 40 percent of all text messages in the Western world contains one or more emojis. In 2009, the Unicode Consortium chose to implement emojis in their standard which entailed that Apple became the first commercial company to add emojis to their keyboard. Previous studies have different opinions on whether or not there is a difference in the use of emojis between younger and older various age-groups. Former studies have mainly focused on the use of emojis in social channels online, however, there is little research on how emojis are experienced in an offline interaction. The aim of this study is to investigate how emojis are experienced offline through text messages in iOS interface of emojis, this is done by comparing two age-groups: informants between the ages of 20-30 and 50-60. Moreover, this study aims to explore the possibilities of improvements of the iOS interface of emojis in order to further improve user experience. The qualitative approach of the study involves unstructured observations and semistructured interviews. The results show both similarities and differences between the age-groups on how they experience emojis when interacting through text messages. It also appears shortcomings in the use of the interface which undermine good usability.
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GOSSELIN, ANNIE. "Mise au point d'une source d'ions de recul pompee par ganil-sme en vue d'etudier des collisions ions-atomes a tres base energie : application aux collisions ar#8#++he." Caen, 1993. http://www.theses.fr/1993CAEN2006.
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Dans le but d'etudier les collisions ions-atomes a basse energie, nous avons realise une source d'ions de recul. Ces ions de recul sont produits par impact de faisceaux issus de la sortie moyenne energie du ganil sur une cible gazeuse. Un dispositif electrostatique et magnetique permet d'extraire, de guider et de selectionner ces ions de recul. Nous indiquons la facon d'operer afin de former des faisceaux les plus intenses possible, de bonne qualite optique tout en conservant une faible dispersion en energie. Afin d'etudier les collisions de ces ions avec une cible gazeuse formee par un jet supersonique, nous avons mis au point trois dispositifs d'analyse qui permettent les mesures des sections efficaces totales, partielles, differentielles en angle, d'echange de charge. A l'aide de deux de ces dispositifs, nous avons mesure les sections efficaces totales de simple capture pour les collisions ar#q#++he pour 6q12 pour une energie de collision de 300 qev ainsi que pour q=6 et 8 pour des energies de collision de 50 a 300 qev. Ensuite, nous avons mesure les sections efficaces partielles de simple capture pour la collision ar#8#++he pour des energies de collisions de 50 a 300 qev. Nous avons egalement effectue une etude de cette collision avec les modeles theoriques a notre disposition afin d'effectuer une comparaison avec nos resultats experimentaux
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Daněček, Vít. "Zálohovaný napájecí zdroj pro lékařský přístroj s managementem po I2C." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217249.
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Object my master’s thesis is the design a Medical device uninterruptible power supply with managment system utilizing I2C bus. Norm EN 61000-3-2 define electric parameters for medical device power supply. In case of power supply for medial equipment is expressive accent on increased electric strength. This power supply have usually primary and secondary power circuit. Primary power circuit form line accumulator, which supplies needed output to the load and recharge reserve battery. Secondary is formed battery-pack, which serve as back-up power supply at drop-out prime circle. They have a minimum weight, small proportions, large overall effectivity also charging battery-pack and monitoring battery-pack charging condition. Result whole those master’s thesis is design Medical device uninterruptible power supply with managment system utilizing I2C bus and realization board layout. Resulting characteristics designed supply unit are: Output voltages are 5V/ 3 A , 12V/ 1,5 A and -12V/ 0,1 A. Managment support information about: Line adapter/ battery pack switch, battery-pack charging condition and actuall tempera-ture battery-pack.
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Fischer, Andreas C. "Integration and Fabrication Techniques for 3D Micro- and Nanodevices." Doctoral thesis, KTH, Mikro- och nanosystemteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-107125.
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The development of micro and nano-electromechanical systems (MEMS and NEMS) with entirely new or improved functionalities is typically based on novel or improved designs, materials and fabrication methods. However, today’s micro- and nano-fabrication is restrained by manufacturing paradigms that have been established by the integrated circuit (IC) industry over the past few decades. The exclusive use of IC manufacturing technologies leads to limited material choices, limited design flexibility and consequently to sub-optimal MEMS and NEMS devices. The work presented in this thesis breaks new ground with a multitude of novel approaches for the integration of non-standard materials that enable the fabrication of 3D micro and nanoelectromechanical systems. The objective of this thesis is to highlight methods that make use of non-standard materials with superior characteristics or methods that use standard materials and fabrication techniques in a novel context. The overall goal is to propose suitable and cost-efficient fabrication and integration methods, which can easily be made available to the industry. The first part of the thesis deals with the integration of bulk wire materials. A novel approach for the integration of at least partly ferromagnetic bulk wire materials has been implemented for the fabrication of high aspect ratio through silicon vias. Standard wire bonding technology, a very mature back-end technology, has been adapted for yet another through silicon via fabrication method and applications including liquid and vacuum packaging as well as microactuators based on shape memory alloy wires. As this thesis reveals, wire bonding, as a versatile and highly efficient technology, can be utilized for applications far beyond traditional interconnections in electronics packaging. The second part presents two approaches for the 3D heterogeneous integration based on layer transfer. Highly efficient monocrystalline silicon/ germanium is integrated on wafer-level for the fabrication of uncooled thermal image sensors and monolayer-graphene is integrated on chip-level for the use in diaphragm-based pressure sensors. The last part introduces a novel additive fabrication method for layer-bylayer printing of 3D silicon micro- and nano-structures. This method combines existing technologies, including focused ion beam implantation and chemical vapor deposition of silicon, in order to establish a high-resolution fabrication process that is related to popular 3D printing techniques.QC 20121207
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楊適存. "The preparation and photoluminescence of Y2O3 phosphors doped Eu3+ and Sm3+ ions." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/90331068833081839777.
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Saisudha, M. B. "Optical Absorption And Fluorescence Properties Of Rare Earth Ions (Nd3+, Sm3+ And Dy3+) In Lead Borate And Bismuth Borate Glasses." Thesis, 1995. https://etd.iisc.ac.in/handle/2005/1756.
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Saisudha, M. B. "Optical Absorption And Fluorescence Properties Of Rare Earth Ions (Nd3+, Sm3+ And Dy3+) In Lead Borate And Bismuth Borate Glasses." Thesis, 1995. http://etd.iisc.ernet.in/handle/2005/1756.
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LeVora, Jennifer K. "THE ROLE OF SMF 1, SMF-2, SMF-3 IN METAL-INDUCED WHOLE ANIMAL VULNERABILITY AND DOPAMINE NEURON DEGENERATION IN CAENORHABDITIS ELEGANS." Thesis, 2012. http://hdl.handle.net/1805/3177.
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Indiana University-Purdue University Indianapolis (IUPUI)The etiology of many neurodegenerative diseases is unknown, but a number of studies indicate that a combination of both genetic and environmental factors contribute to the progression of disease. Exposure to environmental metals, such as Mn2+, Fe2+, Cu2+, and Al3+, has been shown to increase cell death that is characteristic of neurodegenerative disorders such as AD, PD, Wilson’s disease and Menkes disease. These metals are important in numerous biological processes in the brain and their homeostasis is regulated through multiple mechanisms of transport, storage, and secretion. The vertebrate divalent metal transporter-1 (DMT-1) has been implicated in transport and homeostasis of these divalent cations. In these studies I utilize Caenorhabditis elegans (C. elegans) to show that long term exposure to Mn2+ decreases animal viability in a dose-dependent manner, and I demonstrate that C. elegans homologues to DMT-1, SMF-1, SMF-2, and SMF-3, play specific roles in divalent metal ion-induced DA neurodegeneration. I show that SMF-1 contributes to Fe2+-induced DA neuron degeneration, SMF-3 contributes to Al3+-induced DA neuron degeneration, and both SMF-2 and DAT-1 contribute to Cu2+-induced DA neuron cell death. These studies utilize C. elegans as a powerful model to characterize molecules and pathways involved in metal toxicity and metal-induced DA neuron degeneration.
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Karadas, Ferdi. "Preparation and Characterization of Cyanide-Bridged Molecular Clusters and Extended Networks Using the Building-Block Approach." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7622.
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The cyanide ligand has frequently been used to prepare clusters with novel magnetic properties due to its ability to provide an efficient pathway for superexchange between metal centers that are bound in an end-to-end fashion. One of the common synthetic approaches in this chemistry is to design suitable cyanide containing precursors and then to react such building blocks with metal complexes consisting of accessible sites. The triphos ligand (triphos: 1,1,1-tris(diphenylphosphinomethyl)ethane) has been employed in this vein to prepare metal complexes, one of which is a five coordinate paramagnetic complex (S = 1/2) with a square pyramidal metal center, [CoII(triphos)(CN)2]. A family of molecular squares, [{MIICl2}2{CoII(triphos)(CN)2}2] (M= Mn (2), Fe (3), Co (4), Ni (5), and Zn (6)), has been synthesized by the reaction of CoII(triphos)(CN)2 and MCl2 (M= Mn, Co, Ni, Zn) or Fe4Cl8(THF)6 in CH2Cl2/EtOH mixture. A series of cyanide-bridged trinuclear complexes, {[Co(triphos)(CN)2]2 [M(MeOH)4]}(ClO4)2 ( M = Mn (7), Fe (8), Co (9), and Ni (10)) and tetranuclear complexes, {[Co(triphos)(CN)2]2[M(MeOH)4]2}(ClO4)4 ([Co2M2] M = Mn (11) and Ni (12)) have been synthesized in a similar fashion by the reaction of CoII(triphos)(CN)2 and M(ClO4)2.6H2O (M= Mn, Fe, Co, Ni) in methanol. The trinuclear compounds (7-9), and tetranuclear complexes (2-6, 11, 12), are characterized by antiferromagnetic coupling between metal centers while magnetic behavior of 10 indicates the presence of ferromagnetic interactions between the paramagnetic metal centers. Interactions between magnetic orbitals of Co(II) and M(II) ions were also investigated by means of the density functional theoretical (DFT) calculations.
Another triphos containing building block, [(triphos)Re(CN)3] anion (13), has been employed to prepare derivatives of a cubic SMM cluster with four octahedral Re(II) ions and four tetrahedral Mn(II) sites bridging through cyanide ligand. The reactions of Re(II) precursor with MnI2 and solvated Mn(II) ions resulting in derivatives of Re4Mn4 cube with different ligands attached to the Mn center other than the chloride atom were reported. Our efforts on linking these cubes using organo cyanide ligands such as dicyanamide (dca) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) to form extended networks were also discussed.
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Chi, Cheng-Yo, and 紀承佑. "Effect of Sc3+ ion-doped on structure and dielectric properties of Ba(FeNb)0.5O3 ceramics prepared using solid state reaction method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2pqr7j.
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碩士國立虎尾科技大學
電子工程系碩士班
105
In this investigation, complex perovskite structure Ba(FeNb)0.5O3:Sc ceramic was prepared using two step solid state reaction. The Fe3+ ion is substituted with the same valence of Sc3+ ion to form Ba(Fe1-xScxNb)0.5O3 (x = 0~1) ceramic. (Fe1-xScxNb)O4 is formed by calcination in the first step. Afterwards, BaCO3 is added into the (Fe1-xScxNb)O4 in the second step, and then the complex perovskite structure Ba(Fe1-xScxNb)0.5O3 (x = 0~1) is formed when they were calcined at a high temperature. The results of XRD analysis show that all ceramic samples are single phase of cubic complex perovskite structure. With Sc2O3 doping increasingly, the position of diffraction plane (110) shifts to a lower angle region, and its relative density decreases. When a large amount of Sc3+ ion is doped, the dielectric loss is effectively reduced, but sacrifices dielectric constant. The optimum dielectric property is doped with 7% Sc2O3 that the dielectric constant is about 50000 and the dielectric loss is about 0.9 at 1 kHz. The dielectric constant of sample decreases with increasing frequency, which is the relaxation characteristic of a typical ferroelectric material. By the results of Cole-Cole plot analysis, there are two semicircles exist which confirms that BSFN possesses a multiple dissipation relaxation process. By the characteristics of semiconductivity, the impedance of the grain and grain boundary decreases with the rise of temperature, and the grain boundary layer’s capacitance which formed by the difference impedance between the grain and grain boundary leading to a high dielectric constant for Ba(Fe1-xScxNb)0.5O3 ceramics.