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Suský, Stanislav. "Elektrolyty pro sodno – iontové akumulátory s použitím iontových kapalin." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442526.
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The content of this work deals with a theoretical search of sodium-based batteries. The first part of the work contains an introduction to the issue of batteries, contains basic concepts, principles of secondary batteries. In the second part, the basic three divisions of sodium batteries according to the design principles are discussed in more detail. He also deals with the theory of ionic liquids. Their mechanical, thermal and electrical properties and the method used to measure electrolytes are described here. The practical part describes the measurement procedure, displays the recorded measured values and their evaluation.
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Ronning, Margaret Ellen. "Core profile types for the cognitive assessment system and Woodcock-Johnson tests of achievement revised their development and application in describing low performing students /." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1080136687.
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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xi, 107 p.; also includes graphics. Includes abstract and vita. Advisor: Antoinette Miranda, College of Education. Includes bibliographical references (p. 94-107).
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Bali-Jenčíková, Kateřina. "Měření radioaktivního záření se záznamem geolokace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316745.
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This diploma thesis deals with radioactivity research, types of radioactive radiation and radiation detection. There are described types of ionization radiation detectors. The diploma thesis contains the description and principle of the GPS system function. The content is also a proposal with the subsequent realization of a detection device allowing the recording of geolocation. The resulting device is fully mobile with battery status indication. The results are recorded on the SD card.
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Difi, Siham. "Phosphates de type NASICON comme matériaux d'électrode pour batteries sodium-ion à haute densité d'énergie." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT212/document.
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Ce mémoire est consacré à l’étude des composites à base de phosphates de type NASICON comme matériaux d’électrode pour batteries sodium-ion : Na1+xFexTi2-x(PO4)3/C et Na1+xFexSn2-x(PO4)3/C avec 0 ≤ x ≤ 1. Ces composites ont été synthétisés par voie solide suivie d’une pyrolyse avec le saccharose. Ils sont constitués de particules ayant une porosité élevée et enrobées par du carbone conférant à l’électrode une bonne conductivité ionique et électronique. Les mécanismes réactionnels se produisant lors des cycles de charge-décharge ont été analysés en mode operando par diffraction des rayons X, spectroscopies Mössbauer du 57Fe et de 119Sn et spectroscopie d’absorption X. Pour les composites fer-titane, ces mécanismes sont essentiellement basés sur la diffusion des ions Na+ dans les canaux des phases cristallisées avec changements d’état d’oxydation des métaux. Pour les composites fer-étain, les mécanismes sont plus complexes incluant insertion, conversion conduisant à la destruction des phases NASICON, puis formation d’alliages NaxSn. Les meilleures performances électrochimiques ont été obtenues pour Na1,5Fe0,5Ti1,5(PO4)3/C avec un potentiel de fonctionnement de 2,2 V vs Na+/Na0. Même si ces deux familles de matériaux peuvent être utilisées à plus bas potentiel, les performances doivent être améliorées pour envisager leur application comme électrode négative<br>This thesis is devoted to the study of phosphate based composites with NASICON type structure, that are used as electrode materials for sodium-ion batteries: Na1+xFexTi2-x (PO4)3/C et Na1+xFexSn2-x(PO4)3/C with 0 ≤ x ≤ 1. These composites were synthesized by solid state route followed by a pyrolysis reaction with sucrose. They consist of particles having high porosity and coated with carbon giving to the electrode good ionic and electronic conductivity. The reaction mechanisms occurring during charge-discharge cycles were analyzed in operando mode, by X-ray diffraction, 57Fe and 119Sn Mössbauer spectroscopies and X-ray absorption spectroscopy. For the iron-titanium composites, the mechanisms are essentially based on the diffusion of Na+ in the channels of the crystalline phases with changes of transition metal oxidation state. For iron-tin composites, the mechanisms are more complex including insertion, conversion leading to the destruction of the NASICON phases and then reversible formation of NaxSn alloys. The best electrochemical performances were obtained for Na1,5Fe0,5Ti1,5(PO4)3/C with an operating potential of 2.2 V vs. Na+/Na0. Although these two types of materials can be used at lower potential, the performances must be improved to consider their application as the negative electrode
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Cholaraju, Narasaraju Vignesh. "Impact of Extended DRX Cycles on Battery Lifetimes and UE Reachability." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196959.
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Several UE energy consumption optimization techniques have been proposed for Machine Type Communication (MTC) devices. Extended Discontinuous Reception (eDRX) in idle mode is one such technique wherein an UE in idle mode wakes up only during its Paging Occasion (PO) to monitor paging messages from eNodeB (eNB). The PO is located within a Paging frame (PF). The PF is a function of System Frame Number (SFN) cycle of eNB. The paging messages may be sent asynchronously from multiple eNBs to a UE. Due to asynchronous operation of eNBs, SFN takes on different values at a given point in time and therefore a paging message is transmitted at different points in time from different eNBs. Due to this SFN misalignment between eNBs, an idle mode UE might receive and respond to the same paging message from different eNBs and/or miss a PO and thus the paging message. Due to this spread in time of SFN and PO, the actual handling of paging message by the UE becomes inefficient leading to increased UE energy consumption and decreased reachability. These issues, resulting from paging handling, will get amplified further if DRX period is extended longer (eDRX). In this study, we investigate the impact of eDRX cycles and mobility related parameters such as UE speed, cell size and size of SFN misalignment between eNBs on UE energy consumption, use of network resources and UE reachability. Receiving and responding to the same paging message results in increased energy consumption for UE and increased signaling between UE and the network. Missing a PO results in delayed paging reception and hence decreases UE reachability. As the DRX cycle lengths are increased from existing maximum of 2.56 seconds to 10.24 seconds and beyond, we see a reduction in UE energy consumption by more than 90%, but the network signaling and the delay to reach the UE increases linearly as a function of the DRX cycle length. We observe that the number of duplicate paging message receptions/missed POs is minuscule for DRX cycle lengths below 10.24 sec. At DRX cycle length of 10.24 seconds, UEs travelling across 500 m cell radius at speeds of 3, 50, 100 km/h the percentage of duplicate paging receptions are 0.07, 0.11, and 0.15 respectively. This duplicate paging message reception increases the UE energy consumption by 2.31, 6.15 and 12 percent of the total energy units respectively. Similarly, UE misses nearly 0.34, 0.39, and 0.405 percent of the total POs respectively. Depending on the number of consecutive PO misses, the UE reachability decreases. But by reducing the size of SFN misalignment between eNBs, we see that it’s possible to increase the reachability for UEs in eDRX. Further we have proposed solutions based on our analytical study to avoid duplicate paging message reception by UE, increase UE reachability and also reduce UE energy consumption using a windowing technique. We conclude that when a UE is configured with eDRX cycles, the tradeoff between battery lifetimes and UE reachability is based on mobility characteristics and service requirements.
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Forouzan, Mohammad Mehdi. "Simulation and Experiments to Understand the Manufacturing Process, Microstructure and Transport Properties of Porous Electrodes." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6791.
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Battery technology is a great candidate for energy storage applications. The need for high-performance and cost-effective batteries has motivated researchers to put much effort into improving battery performance. In this work, we attempt to understand the elements that affect the microstructure and performance of two battery systems. The first part of this work focuses on the investigation of transport and structural properties of porous electrodes in an alkaline electrolyte. A DC polarization method was deployed for tortuosity measurements. An apparatus was designed to flow specified current through and measure the voltage drop over the porous electrodes. Using a modified Ohm's law, effective diffusion coefficient and associated tortuosity were determined. Multiple compositions (different types and amounts of conductive additives) were tested to understand the effects of composition on the transport properties. As a validation and to further understand the tests, a model was developed and used for data analysis. The second part of this dissertation describes simulations of the manufacturing process of a Li-ion electrode. LAMMPS, a particle simulator, was used for this meso-scale particle-based simulation. The interactions between particles were understood by model-experiment comparisons of the macroscopic properties such as viscosity of the slurry and elasticity of the dried film. The microstructure created by this simulation was consistent with the one we observed in SEM/ FIB images. Although the emphasis was the drying process in this part, some preliminary coating and calendering simulations are presented. Finally, the effects of electrode heterogeneity were investigated by a Newman-type model and tomographic images. An electronic conductivity map was initially generated over a Li-ion cathode. Then SEM/FIB images of specified high, middle, and low conductivity regions were taken to confirm heterogeneity. For modeling purposes, three regions of high, middle, and low ionic resistance were considered connected in parallel, representing the real electrode heterogeneity. Multiple cases of heterogeneities such as non-uniform ionic resistance and active material loading at low, middle, and high charge-discharge rates were studied. The results show that higher rates increase non-uniformities of dependent properties such as temperature, current density, positive and negative electrodes states of charge, and charge and discharge capacities especially in charging cases.
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Azari, Amin. "Energy Efficient Machine-Type Communications over Cellular Networks : A Battery Lifetime-Aware Cellular Network Design Framework." Licentiate thesis, KTH, Kommunikationssystem, CoS, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194416.
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Internet of Things (IoT) refers to the interconnection of uniquely identifiable smart devices which enables them to participate more actively in everyday life. Among large-scale applications, machine-type communications (MTC) supported by cellular networks will be one of the most important enablers for the success of IoT. The existing cellular infrastructure has been optimized for serving a small number of long-lived human-oriented communications (HoC) sessions, originated from smartphones whose batteries are charged in a daily basis. As a consequence, serving a massive number of non-rechargeable machine-type devices demanding a long battery lifetime is a big challenge for cellular networks. The present work is devoted to energy consumption modeling, battery lifetime analysis, and lifetime-aware network design for massive MTC services over cellular networks. At first, we present a realistic model for energy consumption of machine devices in cellular connectivity, which is employed subsequently in deriving the key performance indicator, i.e. network battery lifetime. Then, we develop an efficient mathematical foundation and algorithmic framework for lifetime-aware clustering design for serving a massive number of machine devices. Also, by extending the developed framework to non-clustered MTC, lifetime-aware uplink scheduling and power control solutions are derived. Finally, by investigating the delay, energy consumption, spectral efficiency, and battery lifetime tradeoffs in serving coexistence of HoC and MTC traffic, we explore the ways in which energy saving for the access network and quality of service for HoC traffic can be traded to prolong battery lifetime for machine devices. The numerical and simulation results show that the proposed solutions can provide substantial network lifetime improvement and network maintenance cost reduction in comparison with the existing approaches.<br><p>QC 20161103</p>
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Jiang, Lulu. "Catalytic Performance and Characterization of Zn-doped Cryptomelane-type Manganese Dioxide For Ethanol Oxidation." Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1352827354.
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He, Mingfu. "Towards Efficient Solar Energy Conversion and Storage Devices—the p-type Dye-sensitized Solar Cell and Sodium-Oxygen Battery." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480521221820685.
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Mancuso, Martin. "Grid-connected micro-grid operational strategy evaluation : Investigation of how microgrid load configurations, battery energy storage system type and control can support system specification." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-40019.
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Operational performance of grid-connected microgrid with integrated solar photovoltaic (PV) electricity production and battery energy storage (BES) is investigated. These distributed energy resources (DERs) have the potential to reduce conventionally produced electrical power and contribute to reduction of greenhouse gas emissions. This investigation is based upon the DER’s techno-economic specifications and theoretical performance, consumer load data and electrical utility retail and distribution data. Available literature provides the basis for DER specification and performance. Actual consumer load profile data is available for residential and commercial consumer sector customers. The electrical utility data is obtained from Mälarenergi, AB. The aim is to investigate how to use simulations to specify a grid connected microgrid with DERs (PV production and a BES system) for two consumer sectors considering a range of objectives. An open-source, MATLAB-based simulation tool called Opti-CE has successfully been utilized. This package employs a genetic algorithm for multi-objective optimization. To support attainment of one of the objectives, peak shaving of the consumer load, a battery operational strategy algorithm has been developed for the simulation. With respect to balancing peak shaving and self-consumption one of the simulations supports specification of a commercial sector application with 117 kWp PV power rating paired with a lithium ion battery with 41.1 kWh capacity. The simulation of this system predicts the possibility to shave the customer load profile peaks for the month of April by 20%. The corresponding self-consumption ratio is 88%. Differences in the relationship between the load profiles and the system performance have been qualitatively noted. Furthermore, simulation results for lead-acid, lithium-ion and vanadium-redox flow battery systems are compared to reveal that lithium ion delivers the best balance between total annualized cost and peak shaving performance for both residential and commercial applications.
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Gosse, Guillaume. "Rayonnement acoustique d'une structure périodique de type batterie à ailettes : Application aux pompes à chaleur." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00780182.
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La prédiction du bruit émis par les unités extérieures des pompes à chaleur, provenant en partie des batteries à ailettes, constitue un enjeu industriel important. L'obstacle majeur réside dans l'impossibilité de réaliser le calcul acoustique d'une batterie à ailettes avec les outils de simulation classiques (Éléments Finis de Frontière) à cause du trop grand nombre d'éléments nécessaires (près de 600 ailettes par mètre). Cette thèse a pour objectif d'exploiter la périodicité des batteries à ailettes afin de pouvoir calculer leur bruit rayonné à partir du rayonnement d'une seule ailette. La propagation des vibrations est décrite sous la forme d'une décomposition en ondes, autorisant la réalisation séparée des calculs pour chaque onde. Le déplacement en tout point de la structure est calculé à partir du déplacement d'un seul élément unitaire, obtenu par la Méthode des Éléments Finis (FEM). Un élément unitaire acoustique est spécialement défini, comprenant des baffles rigides destinés à représenter l'influence des autres ailettes de la structure. Le rayonnement de cet élément est calculé pour chaque onde en utilisant la méthode des Éléments Finis de Frontière (BEM), puis dupliqué spatialement en tenant compte de la nature propagative des différentes ondes. Pour chaque structure étudiée, la comparaison avec le calcul direct de la structure complète montre une très bonne concordance avec des temps de calcul fortement réduits. L'influence de plusieurs paramètres sur le comportement de la structure a également été identifiée, mettant ainsi en évidence certains phénomènes particuliers propres aux structures périodiques. Dans la dernière partie de cette thèse, une validation expérimentale de l'approche périodique est proposée. Les résultats numériques sont comparables aux mesures vibratoires et acoustiques réalisées sur les batteries à ailettes.
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Yu, Shicheng Verfasser], Rüdiger-A. [Akademischer Betreuer] [Eichel, and Ulrich [Akademischer Betreuer] Simon. "Development of a monolithic bulk-type all-solid-state lithium-ion battery based on phosphate materials / Shicheng Yu ; Rüdiger-Albert Eichel, Ulrich Simon." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1169755275/34.
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Loho, Christoph [Verfasser], Horst [Akademischer Betreuer] Hahn, and Jürgen [Akademischer Betreuer] Janek. "Advanced Chemical Vapor Deposition Methods for All-Solid-State, Conversion-Type and 3D Li-Ion Battery Concepts / Christoph Loho ; Horst Hahn, Jürgen Janek." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1163394270/34.
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Yu, Shicheng [Verfasser], Rüdiger-A. [Akademischer Betreuer] Eichel, and Ulrich [Akademischer Betreuer] Simon. "Development of a monolithic bulk-type all-solid-state lithium-ion battery based on phosphate materials / Shicheng Yu ; Rüdiger-Albert Eichel, Ulrich Simon." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1169755275/34.
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Lannelongue, Jérémy. "Accumulateurs hautes performances de type plomb-étanche-AGM avec collecteurs de courant à base de titane et de carbone flexibles." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI091/document.
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Ce travail de thèse porte sur le développement d’une technologie Pb-acide de type AGM, avec une conception innovante reposant sur des collecteurs de courant constitués de feuille/grille de titane (électrode positive) et de carbone flexible (électrode négative) couverts d’une couche mince de matériaux actifs. Cette nouvelle approche permet d’augmenter la densité d’énergie et la puissance spécifique de la batterie sans pénaliser sa cyclabilité et sa durée de vie. Des paramètres tels que la résistance électrique et l’utilisation de la matière active ont été évalués avec succès en laboratoire (cyclage profond, cyclage partiel, voltampérométrie cyclique et spectroscopie d’impédance). Ceci en utilisant des cellules plomb-acide et plomb-carbone-acide de petites tailles compressées avec des séparateurs poreux en fibre de verre (AGM). L’épaisseur, la porosité et la quantité d’expandeur sont les paramètres clefs influençant l’évolution de l’utilisation de la matière active négative. Le processus réversible de stockage d’hydrogène à l’intérieur du carbone activé, utilisé comme additif principal dans la plaque négative, est en compétition avec le système Pb/PbSO4 et inhibe son fonctionnement pour une fraction massique supérieure à 9,3 %m. L’utilisation de titane recouvert de SnO2 comme collecteur de courant élimine l’apparition de la corrosion responsable de la défaillance de la cellule. Des modèles multiphysiques basés sur ces données permettront de déterminer la géométrie optimale correspondante à chaque type d’application (énergie, puissance)<br>The aim of this work is to present and proof new concept of high performance lead-acid cells using new thin-plate electrodes. The new approach allows increasing the energy density and the specific power of the battery without a penalty for its cycle and calendar lifetime. Flexible carbon support electroplated with lead and thin surface-modified titanium mesh/foil are used as current collectors. Parameters like electric resistance and active materials utilization have been evaluated successfully in long-term laboratory tests (deep-cycling, micro-cycling, cyclic voltammetry, impedance spectroscopy) using small-scale compressed lead-acid and lead-carbon cells with absorptive glass mat (AGM) separators. The thickness, the porosity and the expander loading are the key parameters which influence the evolution of the negative active material utilization. It has been found that the process of reversible hydrogen storage within the activated carbon used as main dopant of the negative plate competes with the Pb/PbSO4 electrode inhibiting its operation at carbon loading higher than 9.3 %m. The use of SnO2 coated titanium as positive current collector eliminates completely the appearance of corrosion-related battery failure. Multiphysics modeling based on these data will allow fitting to all the battery applications (power, energy)
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Strobridge, Fiona Claire. "A comprehensive study of the olivine-type lithium ion battery cathode materials, LiFe[subscript x]Co₁₋[subscript x]PO₄ (0 [less than or equal to symbol] x [less than or equal to symbol] 1)." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708552.
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Petit, Férey Marie Amélie. "Élaboration et caractérisation d'alliages hydrurables de type ABx (A=La, Mg ; B=Ni ET x=3 à 4) en vue de leur utilisation comme matière active pour électrode négative d'accumulateur Ni-MH." Thesis, Paris Est, 2008. http://www.theses.fr/2008PEST0007/document.
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Les applications portables et stationnaires des accumulateurs Ni-MH nécessitent sans cesse des autonomies de plus en plus importantes. Cet accroissement d’autonomie peut être obtenu en développant de nouveaux composés intermétalliques hydrurables de type ABx (3<br>Mobile and stationary applications for Ni-MH batteries require continuously more and more energy density. This increased autonomy can be obtained by developing new hydride-forming compounds of ABx-type (3
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Edfouf, Zineb. "Étude de nouveaux matériaux composites de type Si/Sn Ni/Al/C pour électrode négative de batteries lithium ion." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00673220.
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Ce mémoire est consacré à l'étude de nouveaux matériaux composites de type Si/Sn-Ni/Al/C pour former des électrodes négatives de batteries lithium ion. La microstructure de ces matériaux se présente sous la forme de nanoparticules de Si enrobées dans une matrice conductrice constituée de carbone et d'un composé intermétallique Ni3,4Sn4. La nanostructure et la composition du matériau composite lui confèrent de très bonnes performances en termes de capacité réversible, de stabilité électrochimique, et de cinétique de réaction. La mécanosynthèse a été choisie comme méthode d'élaboration. Les propriétés structurales et chimiques du composite ont été déterminées par analyses DRX, par microscopies électroniques MET et MEB, par analyses EDX et EFTEM et par spectroscopie Mössbauer de 119Sn. La caractérisation électrochimique a été réalisée par cyclage galvanostatique et par voltamétrie cyclique. La réactivité de ces matériaux envers le lithium a été étudiée par analyses DRX et spectroscopie Mössbauer de 119Sn in-situ. Ce mémoire détaille les résultats structuraux et électrochimiques obtenus pour différents matériaux composites basés sur Ni3,4Sn4 en ajoutant les éléments C, Al et Si. Une étude des mécanismes réactionnels lors du broyage mécanique ainsi que pendant le cyclage électrochimique a été effectuée et le rôle des différents éléments a été mis en évidence. Enfin, une discussion sur l'influence de la microstructure sur les performances électrochimiques des matériaux composites est donnée. Les meilleures performances électrochimiques sont obtenues pour le composite de composition nominale Ni0,14Sn0,17Si0,32Al0,04C0,35. Il présente une capacité réversible de 920 mAh/g avec une très bonne stabilité sur 280 cycles. Le matériau possède une excellente cinétique de délithiation : 90% de la capacité peut être délivrée en moins de 5 minutes. La capacité irréversible (20%) reste toutefois élevée et doit être encore améliorée en stabilisant l'interface solide/électrolyte (SEI)
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Delrot, Sabrina. "Détection de l'encrassement dans un échangeur de chaleur par observateurs de type Takagi-Sugeno." Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2012. http://tel.archives-ouvertes.fr/tel-00739023.
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Le phénomène d'encrassement dans les échangeurs thermiques est actuellement un sujet important. En effet l'encrassement est un phénomène couteux qui provoque (directement ou indirectement via un surdimensionnement des installations) une augmentation des pertes énergétiques, une hausse de la consommation d'eau. Par effet lié, l'encrassement a un impact environnemental non négligeable dû principalement à une augmentation de l'émission de dioxyde de carbone. La détection de l'encrassement peut se faire de manière très ponctuelle en utilisant des capteurs spécifiques et coûteux ou, globalement, soit en mesurant la variation de masse de l'échangeur, soit en évaluant l'efficacité de l'échangeur à travers le coefficient de transfert - ces deux dernières méthodes exigeant des conditions de fonctionnement très particulières : l'arrêt pour la première et un fonctionnement en régime permanent pour la seconde. Les travaux présentés dans cette thèse consistent au développement d'observateurs non linéaires qui permettent de détecter l'encrassement suffisamment tôt pour mettre en place un système d'entretien efficace. Pour cela, un modèle de dimension finie d'un échangeur tubulaire à contre courant a été défini en début de thèse. Trois solutions basées sur le développement d'observateurs non linéaires de type Takagi-Sugeno appliqués au problème de détection d'encrassement dans les échangeurs thermiques sont proposées. La première consiste en une batterie d'observateurs qui estime les paramètres d'encrassement par une méthode d'interpolation. La deuxième propose un observateur polynomial de type Takagi-Sugeno en utilisant la théorie des sommes de carrés. Enfin, un observateur de type Takagi-Sugeno à entrées inconnues est développé. Une comparaison entre ces différentes méthodes est effectuée en conclusion cette thèse.
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Teissier, Sébastien. "Importance de la voie E2F dans la régulation transcriptionnelle du papillomavirus de type 18 et dans la modification du transcriptome des cancers associés." Paris 7, 2006. http://www.theses.fr/2006PA077168.
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Dans un épithélium sain, les kératinocytes cessent de se diviser pour se différencier. Les facteurs E2F sont des facteurs de transcription régulés négativement par pRb et qui jouent un rôle capital dans la régulation du cycle cellulaire. La différenciation des kératinocytes implique un arrêt du cycle caractérisé par un remplacement des E2F activateurs par le complexe répresseur E2F5/p130. Les papillomavirus humains (HPV) infectent les cellules basales des épithéliums et leur réplication requiert une prolifération cellulaire et donc un contournement de l'arrêt programmé du cycle. Les HPV à haut-risque, responsable de l'apparition de cancer du col utérin, expriment deux oncogènes : E6 et E7 induisant respectivement la dégradation de p53 et l'inhibition de pRb. Dans ce travail, j'ai mis en évidence un détournement du complexe répresseur E2F5/p130 par E7 qui le transforme en activateur de la transcription de HPV18. L'action de E7, à la fois sur E2F5/p130 et sur l'activation de la voie E2F via l'inhibition de pRb, permet d'expliquer le contrôle du cycle cellulaire par HPV-18 à la fois dans les cancers et dans le cycle viral. De plus, des études comparatives du transcriptome en puces à ADN de cellules de carcinome cervical HeLa associées à HPV18 dans des conditions d'expression ou de répression de E6 et E7 a permis de découvrir un grand nombre de cibles cellulaires modulées par E6 et E7 via p53 et pRb. Parmi ces gènes, un grand nombre de gènes mitotiques cibles de E2F ont été mis en évidence dont certains sont fortement modulés dans les biopsies de carcinome cervicaux, indiquant que certains de ces gènes pourraient être utilisés pour le diagnostic ou le pronostic de ces cancers<br>In the normal epithelium, keratinocytes stop to divide to differenciate. The E2F family members are transcription factors negatively regulated by pRb that play a crucial role in the cellular cell cycle. Differentiation of the keratinocytes implies a cell cycle arrest due to the replacement of the E2F activators by the E2F5/p130 repressor complex. These viruses infect the basal cell layers of the epithelium and their replication requires a cell proliferation that needs to bypass the programmed cell-cycle arrest. The high risk HPV are the causal agents of the cervical cancer and express two oncogenes E6 and E7 that degrade p53 and inactivate pRb respectively. I have shown a hijack of thé E2F5/p130 repressor complex into an activator of HPV-18 transcription through E7. The roles of E7 played on E2F5/p130 and on the activation of the E2F pathway by the modulation of pRb could explain the take over of the cell-cycle control by HPV-18 in cancer and in the viral cycle. In micro-arrays analyses of the cervical carcinoma HeLa cells transcriptome expressing E6 and E7 or not allowed us to find out a number of cellular genes controlled by E6 and E7 through the p53 and pRb pathways Among these genes, we identified many mitotic genes that are controlled by E2F and that are modulated in cervical cancer biopsies indicating that these genes could be used for diagnosis and prognosis of cervical cancer
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Grenier, Martha Miller. "A study of battered women utilizing the California Psychological Inventory-Revised, the Myers-Briggs Type Indicator, the Constructive Thinking Inventory and the demographic variable of "times previously separated"." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539618321.
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The problem of most shelters is that they have very limited resources. In addition, space is at a premium in most shelters. Optimum employment of these limited resources is paramount. Since leaving the abusive relationship appears to be a process, it would be extremely useful to shelter managers and counselors alike if there were a way to ascertain which women were ready to leave the abusive relationship and which women were not.;Using the scales of Dominance, Independence, and Feminine/Masculine from the California Psychological Inventory - Revised (CPI-R), the scales of Emotional Coping, Behavioral Coping, and Naive Optimism from the Constructive Thinking Inventory, the Thinking/Feeling Preference from the Myers-Briggs Type Indicator, and the demographic variable of "times previously separated," a study was conducted to see if distinctive patterns would arise between those women who chose to return to the abuser and those women who chose not to return to the abuser.;Fifty shelter residents were asked to participate by completing three inventories and a demographic information sheet.;T-tests were used to analyze the data.;The first hypothesis was that women who preferred the Feeling function in their Myers-Briggs Type Indicator would return to the abuser to a greater degree than those who preferred the Thinking function. This hypothesis was not supported.;The second hypothesis was that women who did not return to the abuser would score significantly higher on the California Psychological Inventory - Revised scales of Dominance and Independence and lower on the Femininity/Masculinity scale. This hypothesis was not supported.;The third hypothesis was that women who chose not to return to the abusive relationship would score significantly higher on the scales of Emotional Coping and Behavioral Coping and lower on the scale of Naive Optimism. The hypothesis was supported for the scales of Emotional and Behavioral Coping and rejected for the scale of Naive Optimism.;The fourth hypothesis was that women who had previously separated from their partners zero, one, or two times would return to a significantly greater degree than those who had previously separated three or more times. This hypothesis was not supported.;This research was based upon the multimodal theory of Arnold Lazarus. Findings indicated that the decision to return or not return was a decision impacted by a combination of many variables unique to the individual woman.
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Charton, Christopher. "Etude des interfaces électrode/électrolyte de batteries lithium-ion 5V de type graphite/LiNi0.5 Mn1,5O4." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4039/document.
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Les accumulateurs graphite/LiNi0,5Mn1,5O4 (LNMO) permettent d’atteindre des densités d’énergie élevées grâce à leur tension de 5V. Toutefois, une dégradation des électrodes et des électrolytes à base d’alkylcarbonates et de LiPF6 a lieu à haut potentiel reste un problème qu’il est nécessaire de résoudre. L’ajout d’additifs fonctionnels à l’électrolyte comme l’AS, l’AM, le FEC ou le LiBOB forme des films de passivation aux interfaces électrode/électrolyte. Ces films réduisent la dégradation des matériaux et de l’électrolyte de l’accumulateur Gr/LNMO. Pour étudier le mécanisme d’action de ces additifs, les interfaces graphite/électrolyte et LNMO/électrolyte ont été caractérisées au moyen de cellules symétriques Gr/Gr et LNMO/LNMO et de cellules complètes. Les interfaces ont été étudié par spectroscopie d’impédance électrochimique (EIS) et photoélectronique à rayons X (XPS). De plus, l’électrolyte a été analysé par chromatographie en phase gazeuse liée à la spectrométrie de masse (GC-MS)<br>Gr/LiNi0.5Mn1.5O4 (LNMO) accumulators achieve higher energy densities than current commercial batteries. However, degradation of electrodes and electrolytes based on alkylcarbonates and LiPF6 takes place at high potential remains a problem which it needs to be resolved. The addition of functional additives to the electrolyte such as AS, AM, FEC or LiBOB which form passivation films at the electrode/electrolyte interfaces is a possible solution to these issues. These films reduce the degradation of materials and the oxidation of electrolyte in the Gr/LNMO accumulator. In order to study action mechanism of these additives, graphite/electrolyte and LNMO/electrolyte interfaces were characterized by symmetric Gr/Gr and LNMO/LNMO cells and full cells. Interfaces were investigated by electrochemical impedance spectroscpoy (EIS) and X-ray photoelectron spectroscopy (XPS) while the electrolyte was analyzed by mass spectrometric gas chromatography (GC-MS)
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Lemort, Lucille. "Élaboration et caractérisation d'alliages hydrurables de type ABx (A=Pr, Nd, La, Mg ; B=Ni; x=3, 3.5, 3.8, 5) en vue de leur utilisation comme matière active pour électrode négative d'accumulateurs NiMH." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00599399.
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Une alternative aux énergies fossiles comme vecteur énergétique peut se présenter sous la forme de l'hydrogène et de son stockage. Les hydrures métalliques sont une des options possibles pour le stockage de l'hydrogène. Les accumulateurs alcalins Ni-MH présentent une technologie intéressante pour les applications portables et pour le développement des véhicules électriques hybrides (HEV). Afin de répondre à la demande d'augmentation de la capacité massique des accumulateurs, de nouveaux composés intermétalliques hydrurables de type ABx (3etlt;xetlt;5) sont étudiés. Le groupe A est constitué de terres rares partiellement substituées par du magnésium, le groupe B contient du Ni. Après un état de l'art sur ce type de composés, le travail de cette thèse consiste à rechercher les conditions d'élaboration des composés A1-yMgyNix (3etlt;xetlt;5, 0etlt;yetlt;1, A= La, Pr, Nd) ainsi que de les caractériser d'un point de vue structural et physico-chimique (DRX, microsonde électronique, ICP) et de déterminer leurs propriétés vis-à-vis de l'hydrogène (réac tion solide-gaz et électrochimique). Durant ce travail de nouvelles phases ont été découvertes et caractérisées : les phases (A1-yMgy)5Ni19
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Le, Pape Elodie. "Les effets de la protéine Agouti via MC1R sur la physiologie de mélanocytes murins." Paris 7, 2010. http://www.theses.fr/2010PA077076.
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Le Récepteur aux Mélanocortines 1 (MC1R) est un facteur clé qui régule la pigmentation et qui joue un rôle majeur dans la réponse aux radiations UV. Parmi les ligands du MC1R, a-MSH accroît son activité tandis que son agoniste inverse, la protéine Agouti (ASP) réduit la pigmentation. Les variants du gène MC1R sont corrélés au risque de développer des cancers cutanés y compris le mélanome. Notre objectif était de caractériser les effets moléculaires et cellulaires d'ASP sur des mélanocytes murins. En utilisant la technique des microarrays, nous avons déterminé le profil d'expression génique de mélanocytes cultivés en présence d'ASP ou d'oc-MSH. ASP s'est avéré responsable de la dédifférenciation des mélanocytes, réduisant les protéines spécifiques de la lignée mélanocytaire, inhibant la synthèse d'eumélanine et de phaeomélanine et altérant leur morphologie. De nombreux gènes impliqués dans le métabolisme redox sont inhibés par ASP. En revanche, ASP induit l'expression de gènes développementaux, impliqués notamment dans le système nerveux, les adhésions cellulaires, la migration et le cancer. Nous avons démontré in vitro qu'ASP augmentait la migration et l'invasion de mélanocytes et de cellules de mélanomes murins. Cette étude démontre le rôle pleiotropique de MC1R sur la physiologie des mélanocytes et définit de nouvelles cibles de sa signalisation potentiellement impliquées dans le développement de mélanome<br>The melanocortin-1 receptor (MC1R) is a key factor regulating pigmentation and playing a major role in the UV response. Among MC1R ligands, a-melanocyte stimulating hormone (aMSH) enhances MC1R activity while the inverse agonist, Agouti Signaling Protein (ASP) decreases pigmentation. MC1R polymorphism has been associated with a higher risk of developing skin cancer, including melanoma. Our objective was to characterize the molecular and cellular effects of ASP on normal murine melanocytes. We triggered a microarray analysis to determine the gene expression profiles in melanocytes treated with ASP or a-MSH in a time course manner. We demonstrated that ASP was responsible for thé dedifferentiation of melanocytes, inhibiting the synthesis of both eumelanine and phaeomélanine, altering their morphology, concomitantly with the réduction of proteins of the melanocytic lineage. Numerous genes involved in the redox metabolism were inhibited by ASP. On the other hand, ASP induced a wide range of development-related genes, especially involved in the nervous System development, cell adhésion, migration and cancer. We showed that ASP enhanced in vitro the migratory potential and the invasiveness of melanocytes and melanoma cells. This study demonstrates the pleiotropic effects of MC1R signaling on melanocyte physiology and suggests new targets of MC1R signaling potentially involved in melanoma development
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Serra, Martina. "Ottimizzazione dell'accoppiamento tra generatore fotovoltaico e pompa di calore dual source." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textAbstract:
In questo lavoro di tesi si è studiato il comportamento dinamico di una pompa di calore dual source accoppiata a pannelli fotovoltaici, a servizio di un impianto di riscaldamento e raffrescamento residenziale. Tale lavoro è stato svolto nell’ambito del progetto HEGOS. Dopo una presentazione dei componenti di impianto (pompe di calore dual source, fan-coils, pannelli fotovoltaici e batteria) si è descritto il modello sviluppato su TRNSYS17, software utilizzato per le simulazioni dinamiche. Il cuore della trattazione è rappresentato dal capitolo contenente i casi studio analizzati. Partendo dal caso studio base (nessun impianto FV installato, ma con installata la PdC dual source) si è analizzato come varia l’efficienza complessiva del sistema, durante la stagione di riscaldamento e raffrescamento, al variare della potenza di picco dei pannelli fotovoltaici installati: l’impianto simulato è del tipo grid-connected e prevede in alcuni casi studio l’installazione di un accumulo elettrico. Si sono confrontati i risultati con quelli ottenuti aumentando l’inerzia dell’impianto. Questa ricerca dell’ottimizzazione del sistema è stata accompagnata da un’analisi economica. Dalle simulazioni svolte è risultato che, la soluzione che permette di ridurre maggiormente i consumi annui rispetto al caso base, (riduzione del 53.65%) è data dall’installazione di 6kWp con accumulo elettrico da 3kWh: tale investimento si recupera il 14 anni. Tra le soluzioni che permettono un rientro dell’investimento in 8 anni, quella che consente di risparmiare maggiormente, nell’arco dei 25 anni di vita dell’impianto, è l’installazione di 3kWp con un accumulo elettrico da 1kWh. Tale soluzione è risultata tuttavia confrontabile con l’installazione di 3kWp con un accumulo termico da 60L. La riduzione dei consumi rispetto al caso base nei due casi sopra presentati è pari rispettivamente a: -39.15% e -35.07%.
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Yi-TzuChien and 簡怡慈. "Persuasive Design Strategies Considering User Types for Battery Swap Service Systems of Electric Scooters." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6pdvpk.
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碩士<br>國立成功大學<br>資源工程學系<br>107<br>Among the sales records of the electric scooters, electric vehicles with battery exchange as the main operational mode account for the current largest sales ratio, which is the mainstream in the current market. However, with the increasing number of the users of electric scooters, the problem of battery supply and demand naturally arises. The user's behavior of exchanging battery often concentrates in a certain period of time or at a certain amount of the power stations, resulting in the shortage of batteries in some power stations. On the contrary, the utilization rate of some power stations is low, which will not only affect customer satisfaction, but also the industry.
Therefore, the purpose of this study is to analyze the users' exchanging behavior of the electric vehicle with battery exchange as the main operational mode, and to use the persuasive technology to propose appropriate persuasion strategies in each behavior stage. The research first collects strategies through literature review, and then develops the persuasive strategies suitable for battery exchange systems. Then classifies users according to demographic variables. Through the results of the questionnaire survey, the user's preference for the persuasion strategies are known, and the best persuasion strategy for different user groups is learned. The above results hope to help the motor vehicle industry with battery exchanging as the main operational mode for reference, so as to let battery use more sustainable.
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Huang, Pei-Hua, and 黃佩華. "The Impact of the Battery Power in the Mobile Devices on the Information Types of the Message Delivery." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/525u86.
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碩士<br>銘傳大學<br>資訊管理學系碩士班<br>103<br>Nowadays, smartphone is one of the most popular electronic devices in the world. Most smartphones have many functions, like GPS, communication, Internet, camera, video recording, recorder and etc. Those functions are very common for example contact, life, recording information and reporting. Taiwan sits on the top of two plates and earthquake zone and has many disasters caused by storm and rain. To make users report in time to acquire rescue or make people keep away from disasters when it is happening. The purpose of this research is providing the information of charge about taking photos and recording for example how many time can the user record until the phone is dead when the user choose to use one of the ways above to report the information to public. The research will show the effect of illuminance and decibel on the charge of the smartphone which provides the user to report in the best condition, this research do some experiments base on photo, video recording and recording in different types of situation. This research does many experiments for take picture, video recording and sound recording to have the number of reporting difference information types in each power level. Nowadays, preliminary result shows that illuminance and decibel have effect of the number of reporting when using three difference information types. The change of each power level have mode can follow. This research will keep doing experiments to delete the unusual data and raise the credibility of data. To provide users perfect suggest choosing difference information types to record on smartphones in difference power level.
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Chen, Chia-Hung, and 陳嘉鴻. "Study on Ping-Pong Type Battery Management System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/78002654446949111999.
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Lin, Kun-hsiang, and 林琨翔. "Operation of Boost-type Battery Power Modules in Parallel." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/33909287122420939655.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>To improve the parallel operation characteristics of batteries, this research attempts to configure a battery power source with boost-type battery power modules (BPMs) connected in parallel. The discharging currents of the batteries in BPMs can be individually controlled but are coordinated to execute a full amount load current. An additional benefit for the parallel configuration is the inherent fault tolerance, by which the BPMs with completely exhausted or damaged batteries can be isolated without interrupting the system operation.
In this thesis, the operation of paralleled BPMs for both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are discussed. The analyzed results indicate that the intrinsic internal resistances of the BPMs may alleviate the interaction. A balanced discharging strategy is proposed to discharge the batteries by scheduling the battery currents in accordance with the measured battery voltages. The experiments are carried out on three boost-type BPMs in parallel to confirm the theoretical analyses and to demonstrate the feasibility of balanced discharging.
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柯耀庭. "Electrolyte charging of a storage type silver-zinc battery." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/84612705166710648799.
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Jhan, Jia-fu, and 詹家福. "Configuration and Analysis of Arrayed Boost-Type Battery Power Modules." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/58691484101054051596.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>98<br>This thesis studies the operating characteristics of the boost type
battery power modules (BPMs) with series and parallel configurations.
Under different operating conditions, the BPMs can be operated at the
continuous conduction mode (CCM), the discontinuous conduction mode
(DCM), or the hybrid mode with a combination of CCM and DCM.
The current distribution and balance discharging among BPMs with
different configurations are analyzed in detail. Experiments are carried out
to demonstrate the analysis results. Finally, a circuit configuration with
arrayed BPMs is proposed for adaptable management and maintenance of a
battery power system.
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Jian, Jhen-Yu, and 簡振宇. "Charging Scenario for Serial Buck-Boost Type Battery Power Modules." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/57629112434006299081.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>Battery power modules (BPMs) with bidirectional buck-boost converters, which are connected in series, are operated interactively but substantially can be controlled individually for either charging or discharging. During the charging process, the battery currents can be scheduled by adjusting the duty-ratios of the associated buck-boost converters. To fully utilize the charger’s capacity, several charging scenarios are proposed according to the state of charges (SOCs) of the batteries under the limitations of the charger’s power and current.
To demonstrate the feasibility and capability of the charging scenarios, a battery power system formed by 4 serial buck-boost type BPMs is built and tested. A microcontroller is used for estimating the battery SOCs, and then scheduling the battery currents accordingly. Experimental results show the effectiveness of the charging scenarios.
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Delone, Nicholas Ryan. "Surface enhanced Raman spectroscopy of olivine type battery cathode LiFePO4." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1987.
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This thesis explores the use of Raman Spectroscopy to study the battery cathode material LiFePO4. Surface Enhanced Raman Spectroscopy (SERS) was incorporated into the study due to fluorescence that traditionally plagues Raman. By imaging LiFePO4 nanoparticles, an understanding can be gained of the complex chemistry taking place when the material is lithiated and delithiated at the nanoscale level and the phase changes of the material that occur during this process. The use of bimetallic (Au/Ag) SERS substrates allowed for more stable substrates with longer shelf life compared single metal Ag substrates. Further tuning of these substrates can be applied to the ever evolving science of energy storage material technology as a way to track phase changes in the material.<br>text
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Lee, Po-Ching, and 李柏慶. "Ćuk-Type Brushless DC Motor Driver with Battery Balanced Charging." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55747d.
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碩士<br>國立彰化師範大學<br>電機工程學系<br>102<br>In recent years, the development of the electric motorcycle is growing rapidly. The four 12V series-connected batteries are usually used as the power source in common electric motorcycles. However, due to the differences in each battery, batteries may be overcharged or overdischarged. The charging efficiency would then be reduced as well as the endurance of the electric motorcycle. Moreover, the motor speed would be reduced by the battery voltage drops because the series-connected batteries are directly connected to the drivers in common electric motorcycles. Therefore, enhancing the battery life and the motorcycle endurance are the most important issues.
A Ćuk-type brushless DC motor driver with batteries balancing charging is proposed in this thesis. The driver is composed of a Ćuk-type inverter and a bypass circuit for four series-connected batteries. While the battery voltage drops, the Ćuk-type inverter can still deliver stable power to the motor for remaining the speed. Meanwhile, the voltage of each battery is monitoring to avoid overcharging. The proposed driver circuit can also be used as the grid connected balancing charger for the series-connected batteries. Finally, a 600W prototype circuit is constructed to driving a brushless DC motor with rated speed 3000rpm. The proposed driver is also connected to the grid for balancing charging the series-connected batteries. Corresponding experimental results are given to verify the validity and the performance of the proposed driver.
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Huang, Yen-Hao, and 黃彥浩. "Charge-Discharge Study of Vanadium Phosphate Battery with Gel-typed Electrolyte." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/73335776315481704617.
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碩士<br>國立中興大學<br>物理學系所<br>103<br>Li3V2(PO4)3 cathode materials have been synthesized via a sol-gel route combustion method. The lithium ion batteries in this study are composed of metallic lithium as anode and polymer gel electrolyte. In this study 5 samples were prepared by different polymer wt%. As the result of this study that showed effective electric capacity was positively correlated with polymer gel electrolyte. The difference of average effective electric capacity was 4% ~ 5% when polymer was lower than 20wt%. In the potential range of 3.0V ~ 4.3 V, discharge capacity of 110 mAh g-1 (1C rate). Initial discharge capacity of 56、94 mAh g-1 and stable discharge capacity of 52、50mAh g-1 at 2C , 5C after 100 cycles, but Coulomb efficiency kept in 100%. These data show that Li3V2(PO4)3 structure is stable during charging-discharging.
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He, Chong-Ming, and 何崇銘. "The Study of Lithium Vanadium Phosphate Battery with Gel-Typed Electrolyte." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/75939173917239487513.
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碩士<br>國立中興大學<br>物理學系所<br>102<br>The gel-typed electrolyte batteries, using Li3V2(PO4)3 as cathode and lithium metal as anode, were prepared. The specific capacity of the battery is improved by doping α-Al2O3 particles in polymer gel electrolyte. However, the specific capacities are only 83% and 42% of the theoretical value, when 1 C and 5 C charging-discharging rates are used,
respectively. After charging-discharging 100 times using 1 C or 5C charging rate, the coulomb efficiencies are still 100%. This indicates the structural stable of Li3V2(PO4)3 during charging-discharging process.
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Hsu, Feng-Shuo, and 許峰碩. "The Study of Anode Electrode in Gel-Type Electrolyte Li-ion Battery." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55069275034506451311.
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碩士<br>國立中興大學<br>物理學系所<br>102<br>The charge-discharge characteristics of the gel-type electrolyte batteries, which use MCMB as anode, Lithium metal as cathode, were studied. AC impedance analyzer was also used to explore the transport of the lithium ion in the battery. The specific capacity of battery for liquid
electrolyte is found to be 310mAh/g. Under the fast charge-discharge condition, the specific capacity of battery decreases to 235mAh/g when gel-type electrolyte is used. The specific capacity and the charge-discharge performance of battery can be enhanced effectively by adding nano-sized 2O3 particles. The results of AC impedance indicate that the impedance of Solid Electrolyte Interphase (SEI) films and the charge transfer resistances are reduced when 2O3 particles
are added.
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Yang, Da-Wei, and 楊大為. "Design and Implementation of LLC-type Half-Bridge Converter for Contactless Battery Charger." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/91529629641837341692.
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碩士<br>中原大學<br>電機工程研究所<br>98<br>To charge electronic products, a conduct-type charging by means of metal contact connections is mostly adopted in traditional chargers. However, both the contact points and the exposure of the charger connector cause the vulnerability as well as the corrosion of metal. In certain environments, the use of conduct-type charging has become pretty dangerous. In regard to safety concerns, the non-contact inductive charging technology has therefore arisen. To keep pace with the cutting-edge technology, this thesis will probe into the application of the non-contact inductive power charging technology. In this thesis, a half-bridge inverter is employed. The transformer magnetizing inductance as well as the leakage inductance is used to carry out resonance. The switch with zero voltage switching (ZVS) achieves the goals of reducing the stresses of components, the losses in switching , and the electromagnetic interference. Furthermore, the use of resonant circuit enhance the overall efficiency. A 90W non-contact charger with DC 270V input and 12V output voltage, is implemented in this thesis. In a full loaded condition, while an air gap is 0.15mm, the system efficiency is 75.42%. The system efficiency is 60.17% at the maximum air gap of 0.75mm.
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Lin, Kun-De, та 林坤德. "The Study of α-Al2O3 Nanoparticle Doped Gel-Type Electrolyte Lithium Ion Battery". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/60339551899638223736.
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碩士<br>國立中興大學<br>物理學系所<br>100<br>Nano-composite polymer electrolytes were prepared by mixing various amounts of poly(acrylonitrile) (PAN), ethylene carbonate, and α-Al2O3 nano-particles. Batteries using these nano-composite polymer electrolytes were assembled with lithium iron phosphate and lithium metal as electrodes. Both electrolyte and the battery were characterized by powdered x-ray diffraction, differential scanning calorimetry, thermogravimetry, cyclic voltammetry, AC impedance analysis and battery charger/ discharger. Adding α-Al2O3 nano-particles in polymer electrolytes can effectively increase the conductivity of lithium ion, reduce the crystalline phase of PAN, and the interface resistances between the electrolyte and the electrodes. The electrolyte becomes solid as more PAN is added. This can improve the safety and the charge capacity of the battery.
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Hou, Chih-Hao, and 侯至豪. "Balanced Discharging of Buck-Boost Type Battery Power Modules with Series-Parallel Connection." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/94882411231621589537.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>The operation of a battery power bank with buck-boost type battery power modules (BPMs) connected in series and parallel is studied. All BPMs in the power bank are collaboratively to cope with the load requirements under the restraints of a same output current for serial configuration and a same output voltage for parallel configuration. However, the BPMs can substantially be operated individually to schedule the discharged currents from batteries can be in accordance with their state-of-charges (SOCs) and the operating mode of the converters. The operations of BPMs with series and series-parallel configurations are analyzed to derive the current- distribution equations and then to figure out the discharging strategy accordingly. Experimental results demonstrate that excellent performance on discharge equalization can be achieved during the discharging processes. In addition, a fault-tolerance mechanism can be included to isolate those completely exhausted or damaged batteries. These features are helpful to maintenance and management of a battery power system.
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Kuan, Chi-Hsuan, and 官啟玄. "Development of TSK-Type Probabilistic Fuzzy Neural Network Control for LiFePO4 Battery Storage System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/27852200149425491942.
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碩士<br>國立中央大學<br>電機工程研究所<br>100<br>A digital signal processor (DSP)-based TSK-Type probabilistic fuzzy neural network (TSKPFNN) is proposed in this thesis to control a 4 LiFePO battery
storage system. The storage system includes 4 LiFePO battery module with battery management system (BMS) and bidirectional power flow three-phase AC-DC converter. Moreover, the designed storage system adopts active and
reactive power control for grid connection. Furthermore, to improve the transient of command variation, a TSKPFNN controller is proposed to replace the traditional proportional-integral (PI) controller. The network structure and the online learning algorithms of the TSKPFNN controller are introduced in detail. In addition, all the control algorithms for the proposed battery storage
system are realized in a 32-bit fixed point DSP, TMS320F28035, using assembly language for enhancing the calculate efficiency of the DSP. Finally, the control
performances of the proposed TSKPFNN control system are evaluated by some experimental results.
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Liu, Fang-Ta, and 劉枋達. "Modulating Strategy of Three-Level T-type Inverter Considering SOC of Series Battery Bank." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/739sq8.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>106<br>The three-level T-type inverter has received much interest in energy storage systems due to its high efficiency. The present thesis proposes a novel modulation for three-level T type inverter fed by two distinct battery banks in series connection as energy storages system. The proposed three-level modulation is able to control charge/discharge current of each battery banks to get SOC balancing. In addition, unbalanced condition of capacitors voltage should be considered in three-level modulation since the battery banks might be in different SOCs. Hereby, the inverter will be able to produce balanced output voltage without low order harmonics even under different voltage. Experimental results are provided to verify the proposed method.
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Wu, Yun Chen, and 吳昀臻. "The study of catalytic performance using n-type in neutral-weak basic metal-air battery." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jz7w7u.
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Stanje, Bernhard, Stefan Breuer, Marlena Uitz, et al. "Solid Electrolytes: Extremely Fast Charge Carriers in Garnet-Type Li6La3ZrTaO12 Single Crystals." 2017. https://ul.qucosa.de/id/qucosa%3A31616.
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"Nuclear Fission Weapon Yield, Type, and Neutron Spectrum Determination Using Thin Li-ion Batteries." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.44161.
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abstract: With the status of nuclear proliferation around the world becoming more and more complex, nuclear forensics methods are needed to restrain the unlawful usage of nuclear devices. Lithium-ion batteries are present ubiquitously in consumer electronic devices nowadays. More importantly, the materials inside the batteries have the potential to be used as neutron detectors, just like the activation foils used in reactor experiments. Therefore, in a nuclear weapon detonation incident, these lithium-ion batteries can serve as sensors that are spatially distributed.
In order to validate the feasibility of such an approach, Monte Carlo N-Particle (MCNP) models are built for various lithium-ion batteries, as well as neutron transport from different fission nuclear weapons. To obtain the precise battery compositions for the MCNP models, a destructive inductively coupled plasma mass spectrometry (ICP-MS) analysis is utilized. The same battery types are irradiated in a series of reactor experiments to validate the MCNP models and the methodology. The MCNP nuclear weapon radiation transport simulations are used to mimic the nuclear detonation incident to study the correlation between the nuclear reactions inside the batteries and the neutron spectra. Subsequently, the irradiated battery activities are used in the SNL-SAND-IV code to reconstruct the neutron spectrum for both the reactor experiments and the weapon detonation simulations.
Based on this study, empirical data show that the lithium-ion batteries have the potential to serve as widely distributed neutron detectors in this simulated environment to (1) calculate the nuclear device yield, (2) differentiate between gun and implosion fission weapons, and (3) reconstruct the neutron spectrum of the device.<br>Dissertation/Thesis<br>Doctoral Dissertation Electrical Engineering 2017
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Wang, Wen-Chun, and 王文淳. "Performance Analysis of charge/discharge cycle effect of Multi-type Li-ion battery electrolyte and electrode systems." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/b8772f.
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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>98<br>In 1997, Goodenough et. Al. present the called of LiMPO4, at the same year, Padhi proves that LiFePO4 can be used as the cathode materials of rechargeable lithium-ion battery；In 2000, Amine et. Al. has investigate the crystal size of olivine structure LiCoPO4；In 2001, Yamada et. Al. has fabricated olivine structure LiCoPO4 by sol-gel；In 2004, Herle et. Al.has fabricated olivine structure LiNiPO4 by solid state method.
Traditional Lithium Iron Phosphate Battery is not harmless to environment, easy to obtain, the charge and discharge structure are similarity, very safe and stable while working. And the earth is rich of Iron, so the cost of iron is low, besides, iron has good thermal stability, high activity, so it has been widely use in hybrid vehicles, electric cars, electric bikes.
LiFePO4 compound material, iron’s conductivity is lower than other material, so if use carbon coated on the cathode, can improve to big scale, high rate or decrease crystal size to increase ion space, thus to increase dicharge. So we discuss four kinds of the cathode material: LiCoPO4、LiMnPO4、LiNiPO4 and LiFePO4,discuss the theoretical capacity, frequency of charge/discharge, COP and current efficiency, respectively. Hope we can use this technology on large electric vehicles, solar and wind power storage device, hybrid vehicle in the future, and into a high efficiency, low cost products generation.
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Loho, Christoph. "Advanced Chemical Vapor Deposition Methods for All-Solid-State, Conversion-Type and 3D Li-Ion Battery Concepts." Phd thesis, 2018. https://tuprints.ulb.tu-darmstadt.de/7577/7/Loho_Dissertation_2018.pdf.
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The newly established CO2-laser assisted chemical vapor deposition (LA-CVD) is applied to research multicomponent Li-ion battery materials, which are very difficult to prepare with conventional CVD precursor delivery systems. The capabilities of LA-CVD to grow functional thin films for application in next generation Li-ion batteries, i.e., all-solid-state, conversion-type, and 3D architecture concepts, are assessed in comparison with aerosol assisted chemical vapor deposition (AA-CVD), which is another advanced precursor delivery method.
The growth of high quality, well-performing battery materials is successfully achieved with both CVD techniques. AA-CVD allows for a more precise control over the stoichiometry of the films, exemplified by depositions of LiCoO2, LiCo1-xNixO2, and Li(Ni1/3Mn1/3Co1/3)O2 (NMC) cathodes. But with LA-CVD the microstructure of the films can be tailored between highly dense and porous providing more flexibility towards application. Both CVD processes make conformal coatings of 3D architectures possible with structure sizes down to several 10 μm (AA-CVD) and 1.5 μm (LA-CVD), thus have high potential for coatings in 3D battery concepts.
Efforts are made to develop thin films of garnet-type oxide solid electrolytes due to their high Li-ion conductivity paired with a wide electrochemical stability window qualifying them for the use in all-solid-state batteries (ASSBs). It is found that AA-CVD is unsuited for the growth of garnet-type solid electrolytes, whereas LA-CVD is capable of growing garnet-type thin films of composition Li5La3Ta2O12 (LLTaO) and Li7La3Zr2O12 (LLZrO). The result that cubic LLTaO can be stabilized easier than cubic LLZrO via LA-CVD is exploited to study the influence of grain boundaries in fine-grained and coarse-grained LLTaO thin films. Furthermore, the chemical stability between LLTaO and Li on the atomic level is proven experimentally for the first time resolving a recent debate on their interfacial stability.
Both CVD methods are well suited for the growth of conversion-type transition metal (TM) oxide anodes. By investigating the kinetics and degradation mechanisms of TM-oxide films (TM = Co, Ni, Mn) a clear correlation between microstructure and performance is found. Higher porosity and smaller structure size lead to increased rate capability and higher specific capacity. Therefore, TM-oxide thin film anodes with nanoparticulate microstructure grown by AA-CVD and LA-CVD bear great potential for application in conversion-type battery concepts.
Having accomplished every battery component individually, model experiments on different garnet based ASSBs are pursued. Cycling a thin film battery based on LiCoO2 | LLTaO grown consecutively by LA-CVD failed, however, a hybrid cell with additional liquid electrolyte could be cycled successfully. Moreover, ASSBs combining pelletized LLZrO with a LiCoO2 thin film grown by LA-CVD, with and without interface modification by Nb, can be reversibly cycled at 25 °C with superior performance to the majority of literature reports on garnet based ASSBs.
Several of the investigated Li-ion battery materials are grown for the first time via CVD such as thin films of LiNiO2, LiCo1-xNixO2 and NMC cathodes, LLTaO and LLZrO solid electrolytes as well as Ni- and Mn-oxide anodes. Besides, garnet-type LLTaO and LLZrO grown by LA-CVD and NiO grown by AA-CVD show best-in-class performances indicating the high quality of thin films grown by either method. Consequently, this dissertation demonstrates that the use of advanced CVD precursor delivery methods opens up a powerful playground for Li-ion battery applications in terms of material development, fundamental research, and realization of next generation Li-ion battery concepts.
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Lin, Leng-Lan, and 林亨翰. "Development of Fiber-Type Li-Ni-Mn-O High-Voltage Cathode and Electrode Characteristics for Lithium Ion Battery." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2vcswu.
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碩士<br>國立臺南大學<br>綠色能源科技學系碩士班<br>105<br>In recent years, with the increasing-growing market of the electric vehicles (EVs), hybrid electric vehicles (HEVs) as well as other new-generation transportation tools, development of secondary batteries is towards large-scale, requiring high power density and stability. To meet the requirement, a battery design capable of affording more active material loading on an electrically conductive network without other additives is therefore preferred.
In this study, a nickel-manganese-based cathode is developed using carbon fibers as current collectors via a low-temperature sequential process, including the electrodeposition and the hydrothermal reaction. The binder free fiber-type cathode, which combines the advantages of carbon fiber and active material of Li-Ni-Mn-O, is electrochemically stable against high-voltage . In the preparation process, Mn:Ni molar ratio in the electrodeposition solution was varied from 8:2, through 7:3, 6:4 to 5:5. followed by the hydrothermal reaction and calcination to obtain the fiber-type cathodes
The synchrotron XRD patterns found, just Mn: Ni = 7: 3 and 6: 4 both have spinel LiMn2O4 and LiNi0.5Mn1.5O4 peak. According to the charge / discharge test, only the cathode of Mn: Ni = 7: 3 (LNMO-7) has discharge plateaus at voltage around 4.5 V and 4 V, demonstrating the typical spinel LiMn2O4 and LiNi0.5Mn1.5O4 electrochemical properties, and its discharge capacity is 142 mAh/g.
Regarding the Raman analysis of LNMO-7 calcined at 400 ºC, the band at 501 cm-1slightly shifts toward higher frequencies and the two split bands are found at 595~625 cm-1. This can be attributed to the increase of the average valence state of Mn ions, corresponding to its better electrochemical stability.
When the concentration of LiOH in the hydrothermal reaction is reduced from LiOH:Precursor=200:1 to 30:1, it is found that the irreversible capacity in the first cycle is reduced from 55 to 44%, which is attributed to the characteristics of layered Li2MnO3. Active materials synthesized during the hydrothermal reaction of LiOH:Precursor= 200:1(LNMO-7) and LiOH:Precursor=30:1(LNMO-7-30) were analyzed by synchrotron (SP-8) X-Ray diffraction, showing that the peak intensity of spinel LiMn2O4 in LNMO-7-30 at 2θ = 36.38°, 43.63° and 63.2° is higher than LNMO-7. It is indicated that more spinel LiMn2O4 phase is present in LNMO-7-30. It is also known from its cyclic voltammetry of LNMO-7-30 that the electrochemical characteristics of spinel LiMn2O4, is more pronounced rather than the LiNi0.5Mn1.5O4. Further, in the cyclic life test, the LNMO-7 fiber electrode exhibits better capacity retention due to the presence of spinel LiNi0.5Mn1.5O4.
In summary, the developed fiber-type Li-Ni-Mn-O shows its high electrochemical stability against the high voltage operation of 2.5-4.9 V, delivering a favorable discharge capacity of 140 mAh/g-1 with a high capacity retention (>90%) after 80 cycles.
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Chen, Yi-Sheng, and 陳奕升. "The Investigation of New Type of Additive(N,N’-bismaleimide-4,4’-diphenylmethane and maleimide) in Lithium Ion Battery." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4q6gr4.
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碩士<br>國立臺灣科技大學<br>化學工程系<br>107<br>This study used a differential scanning calorimeter (DSC) to investigate the maleimide additive (Living@ MI) and bismaleimide / maleimide additive (Living@ BMI/MI) with non-isothermal kinetics that can be understanded the reaction temperature, exotherm. the study also used the free model method to know the activation energy, and identification of chemical structure of Living@ BMI/MI, Living@ MI additive by nuclear magnetic resonance (NMR), and thermogravimetry Analysis (TGA) and dynamic light scattering (DLS), respectively, for testing Living@BMI/MI and Living@MI additive heat-resistant properties and Living@BMI/MI additive Microgel particle properties.
On the other hand, Living@BMI/MI and Living@MI additives were applied to lithium-ion batteries, We want to know the effect of LiNi0.5Co0.2Mn0.3O2 cathode material. The cathode be made to the half-cell, It was used for charging. Discharge test (C/DC), Electrochemical Impedance Spectroscopy (EIS), and cyclic voltammetry (CV) tests were performed to analyze the effects of the two additives added to the positive electrode material. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to understand the surface morphology and elemental composition of the electrode after charge and discharge. Finally, the thermal stability of the electrode material was tested by differential scanning calorimetry (DSC). . The experimental results of this study, adding 1wt% of Living@BMI/MI to the positive electrode material can most effectively improve the cycle life degradation and electrochemical reaction properties of the positive half cell at room temperature, while the charge and discharge test in the high temperature environment is to add 1 wt. % Living@ MI is the most excellent, and the heat resistance of Living@BMI/MI with 0.5% thermal stability of the electrode material is better.
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Chen, Huang-Shen, and 陳煌昇. "The preparation of P(vdf-hfp)/Pyr14TFSI gel-type electrolyte and its application on flexible lithium ion battery." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/32907996529134533582.
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碩士<br>中原大學<br>化學研究所<br>104<br>Rechargeable lithium ion batteries (LIBs) have been applied in portable electronics and electricity powered transportation due to the high energy and power density. Unlike the traditional batteries packed in a cylindrical type, currently, most LIBs used in the consumer electronics (like smart phones and pads) are prismatic batteries. To meet the requirement of the electronics with particular shape such as wearable devices the flexible energy storage devices have been developed. For the safety concern, the solid electrolytes, such as polymer electrolyte, are developed to avoid leakage of liquid electrolyte. Nevertheless, the larger interfacial resistance between the solid electrolyte and electrodes and less flexibility reduced its application. Therefore, the geltype electrolytes are favored because lithium ion is more easily to transport in gel electrolyte than solid electrolyte. Yet, as reported, certain amount of the organic solvents such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC)…etc. have been usually used with polymers in the traditional gel electrolytes, causing the suspicion of solvent leakage. In this work, the solventfree polymer based ionogel electrolyte (IGE) composed of nonflammable and thermally stable NbutylNmethylpyrrolidinum bis(trifluorome thanesulfonyl) imide (PYR14TFSI) room temperature ionic liquid and polyvinylidenefluoridecohexafluoro- propylene (P(vdf-hfp)) are prepared by the solution casting method. The thermal properties are determined by the DSC measurements. And the electrical properties are investigated by the linear sweep voltammetry, cyclic voltammetry and impedance spectroscopy. It is found that the asprepared ionogel electrolytes are flexible selfstanding films with wide electrochemical windows. The best conductivity obtained at room temperature is 6.0 × 10−4 S cm−1. The highest capacity of the half-cell fabricated with the asprepared IGE achieves 143 mA h g-1 at 0.2C rate. And even after 50 cycles, the capacity retains 135 mA h g-1 at 0.2C. Besides, the capacity of the bending full-cell (LFP/PYR14_6/ Carbon) reached 130 mA h g-1 at 0.2C rate. This study reveals that the ionogel electrolyte is a promising safe electrolyte for application in the flexible LIBs.