Tesis sobre el tema "In-situ aging"
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Varia, Adhyarth C. "In-Situ Capacity and Resistance Estimation Algorithm Development for Lithium-Ion Batteries Used in Electrified Vehicles". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408665208.
Texto completoSchneider, Sabine [Verfasser], Jean [Akademischer Betreuer] Krutmann y William [Gutachter] Martin. "Characterization of molecular mechanisms involved in intrinsic and extrinsic skin aging of in situ aged normal human dermal fibroblasts / Sabine Schneider ; Gutachter: William Martin ; Betreuer: Jean Krutmann". Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2021. http://d-nb.info/1241824169/34.
Texto completoShah, Riddhi Jitendrakumar. "Amélioration de la fiabilité par la gestion dynamique de l'usure à l'aide de moniteurs in situ". Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT038.
Texto completoAs technology node continues to shrink to achieve higher performance at high density, it has become extremely challenging to handle the effects of Process, Voltage, Temperature and Aging (PVTA) variations. The stringent requirement of achieving higher performance while maintaining the reliability of the design has become an important concern especially for the energy-efficient designs. The traditional approach of adding pessimistic timing margins to assure all operating points under worst case conditions is not feasible in advanced technology nodes due to the huge impact on design costs. In this thesis work, on-chip reliability and performance monitors as well as adaptive compensation techniques are investigated to address these challenges in the digital circuit design. Internally as well as externally situated monitors are evaluated for the accuracy of detection of PVTA variations. A novel externally situated timing monitor is proposed to detect PVTA variations accurately without impacting the timing closure of the reference design. A detailed analysis has been presented on the investigation of robustness of digital circuits using In-Situ Monitors emphasizing detection of global and local process variations, aging variations and cost impact of insertion of monitors on performance, power and area. For these analyses, measurements and simulation results are demonstrated using three different digital circuits implemented and fabricated in 28nm FDSOI CMOS technology of STMicroelectronics. Closed-loop adaptive voltage and body-bias compensation schemes have been proposed with In-Situ Monitors, and manufactured product results are analyzed
Ramdon, Sanjay Kiran. "Nanoscale Characterization of Aged Li-Ion Battery Cathodes". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376625747.
Texto completoAnguita, Paola. "Impact des biocarburants sur le système d’oxydation catalytique des véhicules diesel". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1181.
Texto completoThe more restrictive regulations to reduce pollutants emissions, especially CO2, promote the use of biofuels. However, biodiesel contains inorganic elements (Na, K, Ca and P) that reduce the durability of the after-treatment catalysts. This work aims to evaluate the performance of Diesel Oxidation Catalysts (DOCs, PtPd/CeZrO2/La-Al2O3 reference catalyst). The characterization results have shown that the above-mentioned impurities affect the physico-chemical, redox, surface and catalytic properties. Although the catalyst crystalline structure of reference catalyst did not change after impurities incorporation, the specific surface area decreased. The redox ability was also decreased when Na, K and Ca impurities are present due to their low electronegativity, which increased the oxygen interaction. This high interaction seems to be responsible of the enhanced C3H6 reaction rate. NO-TPD results evidenced that the high basicity of Na, K and Ca impurities resulted in an increase of NO adsorption strength. Accordingly, DRIFT results showed the presence of NO intermediates adsorption associated to the electrostatic field created by these cations, hindering NO oxidation. CO adsorption was also promoted, enhancing CO reaction rate. The formation of cerium phosphate was also observed, which could stabilize the Ce3+ oxidation state (checked by XPS), decreasing NO oxidation due to the blockage of catalytic sites. Nevertheless, CO and C3H6 co-oxidations were enhanced by avoiding self-poisoning. After catalyst hydrothermal aging, the effect of impurities was masked by the sintering of Pt/Pd active sites, which decreases the DOC catalytic performances
KOMATSU, LUIZ G. H. "Estudo comparativo de nanocompósitos de polipropileno modificado sob condições de envelhecimento ambiental e acelerado". reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26380.
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Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Quennehen, Boris. "Etude des aérosols transportés en Arctique à partir des mesures aéroportées (ATR-42) du LaMP durant le projet POLARCART". Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22198/document.
Texto completoThe aims of this thesis were, in a first step, to build a climatology of pollution plumes transported from source continents to the Arctic as measured during the POLARCAT-France campaigns performed in spring and summer 2008, in the frame of the 4th International Polar Year. The climatology is including informations on aerosol particle physical, chemical and optical properties and is organized as a function of pollution plume origins (determined with the Lagrangian transport model FLEXPART). In a second step, aerosol processes which influenced aerosol properties during transport to the Arctic were studied. During the summer campaign, the whole plumes encounter experienced wet scavenging processes on their pathway to Groenland. In spring, a plume was sampled during three consecutive days and thus, its ageing was characterised. Finally, two Asian plumes allowed us to highlight the external mixing between anthropogenic and biomass burning contributions transported to northern scandinavia
Ding, Li. "Optical Anisotropy and Molecular Orientation of CuPc Films and Optical Properties of Ultra-thin High-k Films". Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-97100.
Texto completoIn dieser Arbeit werden dünne Schichten aus Kupferphthalozyanin (CuPc) mittels spektroskopischer (in-situ) Ellipsometrie (SE) und (in-situ) Reflektions-Anisotropie-Spektroskopie (RAS) untersucht, um die optische Anisotropie in einer Ebene parallel und senkrecht zur Schichtoberfläche und die molekulare Orientierung zu bestimmen. CuPc ist ein aussichtsreicher Kandidat als organischer Halbleiter in organischen Feldeffekt-Transistoren, organischen Leuchtdioden und organischen Solarzellen. Vizinale Si(111)-Substrate sind wegen der Anisotropie in der Substratebene interessant, die durch die Treppen und Terrassen auf der Oberfläche verursacht wird. Die Stärke der Anisotropie der vizinalen Si(111)-Oberfläche ist vom Schnittwinkel (Offcut) abhängig. Es wird der Einfluss des Offcut-Winkels auf die molekulare Orientierung in dünnen CuPc-Schichten parallel und senkrecht zur Substratoberfläche untersucht. Die in-situ Untersuchungen von CuPc-Schichten weisen darauf hin, dass strukturelle Veränderungen beim Wachstum auftreten. Darüber hinaus wurden zwei unterschiedliche Oberflächenmodifizierungsschichten, um deren Wirkung auf die molekulare Orientierung von CuPc zu untersuchen, verwendet: eine OTS-Monoschicht mit aufrecht stehenden Molekülen und PTCDA-Schichten mit flach liegenden Molekülen. Metall-organische Grenzflächen spielen eine wichtige Rolle in organischen elektronischen Bauelementen. In-CuPc wird als Beispiel für ein Metall-organisches System durch in-situ SE und RAS untersucht. Wenn In thermisch auf eine CuPc-Schicht aufgedampft wird, diffundieren In-Atome zunächst in die darunterliegende CuPc-Schicht und bilden dann Cluster auf der Schicht. Hafniumdioxid (HfO2) ist ein heißer Kandidat für das Ersetzen des herkömmlich als Gate-Dielektrikum verwendeten SiO2 mit dem Ziel, die Leckströme bei der weiteren Verkleinerung mikroelektronischer Bauelemente zu minimieren. Um amorphe Schichten, die vorteilhaft zur Minimierung der Leckströme sind, zu erhalten, werden die HfO2-Schichten, die oft kristallin sind, mit Aluminiumoxid (Al2O3) (k-Wert: 9) kombiniert, das bei wesentlich höheren Temperaturen amorph bleibt. Zwei Serien von ultra-dünnen Proben wurden durch Atomlagenabscheidung hergestellt: Mischschichten HfxAl1-xOz und Doppelschichten HfO2 auf Al2O3. Die optischen Konstanten und Bandlücken wurden mittels SE im Energiebereich von 0,7 bis 10 eV bestimmt. Es hat sich gezeigt, dass die (effektive) Bandlücke der Misch- und Doppelschichten durch die Komposition abgestimmt werden kann. Nach Lagerung der High-k-Schichten für zwei Monate an Luft konnte ein Alterungseffekt beobachtet werden. Dieser wird auf die weitere Oxidation der dielektrischen Schichten, die durch Sauerstoffdiffusion aus der Umgebungsluft in die High-k-Schichten ermöglicht wird, zurückgeführt
Suryaputra, I. Gusti Ngurah Agung [Verfasser] y Thorsten [Akademischer Betreuer] Dittmar. "Fluoreszierendes gelöstes organisches Material (FDOM) in Küstenmeeren: Charakterisierung, biogeochemische Prozesse, und die Möglichkeit der in situ Überwachung / I Gusti Ngurah Agung Suryaputra. Betreuer: Thorsten Dittmar". Oldenburg : IBIT - Universitätsbibliothek, 2012. http://d-nb.info/1027530923/34.
Texto completoLegrand, Nathalie. "Modèle multiphysique et méthodes d'analyse in-situ, non destructives, qualitatives et quantitatives de diverses sources de vieillissement d'accumulateurs lithium-ion". Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0240.
Texto completoOptimisation of a battery life time requires the prediction of its ageing and the identification of the involved ageing mechanisms. In order to avoid the limitations due to standard ageing characterisation methods (performance evaluations conducted regularly along ageing and post-mortem characterisations), other tools allowing assessment of the electrode state without deterioration along the life time, have been tested. It concerns a multiphysic model of lithium-ion battery and two methods for in-situ parameter extraction: the first is based on the study of the derivative of the tension profile and the second one, on the difference between the slope of the tension profiles at the fresh state and at the considered state. The non-available parameters required for set up of the multiphysic model for one battery have been evaluated for different states of charge and various temperatures. This model has been validated by comparison with experimental measurements. The application of these tools is illustrated for three different ageing mechanisms. Moreover these methods have been especially applied for the case of lithium plating ageing. Use of the VL41M Saft model allowed to set up an abacus of the limiting charge currents and an experimental validation has been performed in using the method so-called derivation method
Guimarães, Rafael Paiotti Marcondes. "Estudo in situ da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-X com luz síncrotron de alta energia". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-15032018-082818/.
Texto completoRecently introduced, the new Ti-55531 titanium based alloy has been developed aiming structural applications such as the automotive and aerospace ones. The present Thesis is focused on the assessment of Ti-55531 alloy in situ solid state transformations during ageing at diferente temperatures as well as initial conditions. In this sense, the study emphasis will deal with both quantitative and qualitative analysis of the main constitutive phases found in the alloy, namely the body-centered cubic β, both hexagonal α and ω and the martensitic α\'\', this one orthorhombic, by means of Rietveld refinement. Concerning the data, it was obtained by high energy X-ray diffraction (HEXRD) technique in a synchrotron light source facility. All the Debye-Scherrer rings resulting from these in situ experiments were analyzed by both FIT2D and MAUD software.
Bello, Nicolas. "Effets d'un vieillissement longue durée sur deux alliages d'aluminium de la série 2000". Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30301/document.
Texto completoThe main objective of this work which has been conducted between the IRT Saint Exupéry and the CEMES, Université de Toulouse, CNRS laboratory is to reduce production and exploitation costs of aircraft primary structures by evaluating the potential increase of operating temperatures of aluminum alloys. To do so, two already fit-to-fly Al-Cu alloys have been selected and studied: the 2219-T851 and the 2050-T84. These alloys have been characterized throughout ageing treatments up to 10,000h at 200°C with electronic and optical microscopies in order to evaluate the microstructural changes. Standardized mechanical tests have also been conducted to follow the effects of such ageing on the alloys’ properties. The results have shown the stability of the mechanical properties and the microstructure of the 2219-T851 from 1,000h to 10,000h of ageing. This is attributed to the nano-precipitation of θ'-Al2 Cu, stable during the ageing treatment. Moreover, those precipitates tend to form during the ageing of the 2050-T84 by replacing the well known T1-Al2CuLi phase, unstable during medium range temperature ageing. During this thesis, special attention has been paid on the link between the mechanical properties and the fine scale microstructures of both alloys
Xiong, Xiao Chuan. "Élaboration et genèse des microstructures dans les "aciers" fer-azote". Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL079N/document.
Texto completoCar designers are seeking ways to increase the proportion of parts made of sheet steels of higher strength and lower cost. The parallel between the Fe-N and Fe-C phase diagrams shows that it is possible to develop similar steels in the Fe-N system. The objective of this study was to prepare binary Fe-N steels and to develop structures equivalent to those in carbon steels. Approaches to meet the objectives are considered: Preparations of Fe-N steels: gas nitriding in austenite domain followed by homogenization treatments allowed to introduce high amount of nitrogen in pure iron sheet. A simulation of the nitrogen diffusion was proposed to describe the weight increase during nitriding. Genesis of microstructures: The slow cooling of the Fe-N austenite led to lamellar and globular pearlitic structures composed of ferrite and nitrideFe4N. An acicular microstructure, which is the consequence of the precipitation of the ferrite in the nitride Fe4N, was also identified. The slow cooling of the supersaturated Fe-N ferrite led to the precipitation of the stable nitride Fe4N and the metastable nitride Fe16N2, which witnessed a rapid diffusion of nitrogen in ferrite at low temperature, comparable to that of carbon. The multiphase microstructures [alpha+alpha'+gamma] were obtained by intercritical treatments followed by quenching. The intercritical domain was reviewed using the sub-lattice model. In-situ TEM investigations have identified the precipitation of Fe16N2 nitride in the ferrite during the aging at 85 °C. High amount of the residual austenite have been identified, which would be the basis for development of TRIP nitrogen steels
Huang, Chiao-Yang y 黃朝陽. "ICE-RADAR: In-situ, Cost-Effective Razor Flip-Flop Deployment for Aging Resilience". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/fb5he9.
Texto completo國立交通大學
資訊科學與工程研究所
104
Device aging, which causes significant loss on circuit performance and lifetime, has been a primary factor in reliability degradation of nanoscale designs. Aggressive technology scaling trends, such as thinner gate oxide without proportional downscaling of supply voltage, aggra-vate the aging impact and thus necessitate an aging-aware reliability verification and optimi-zation framework during early design stages. In this thesis, we propose to exploit timing spec-ulation for aging resilience, based on deploying Razor flip-flops. By formulating the problem based on Boolean satisfiability, for the first time we can determine a feasible deployment of Razor flip-flops, such that maximum degree of aging resilience can be achieved in a cost-effective manner. Experimental results show that more than 50% of aging-induced perfor-mance degradation can be recovered, while reducing the number of required Razor flip-flops by about 70%, as compared to the case of naïve Razor flip-flop deployment.
Sousa, Joana Filipa Costa e. "Investigation of in-situ test protocols for accelerated aging of gas diffusion media of PEM fuel cells". Master's thesis, 2019. https://hdl.handle.net/10216/122392.
Texto completoSousa, Joana Filipa Costa e. "Investigation of in-situ test protocols for accelerated aging of gas diffusion media of PEM fuel cells". Dissertação, 2019. https://hdl.handle.net/10216/122392.
Texto completo(10723662), Chunxu Huang. "In-Situ Performance of HVAC Filters Aged with 100% Outdoor Air". Thesis, 2021.
Buscar texto completoDing, Li. "Optical Anisotropy and Molecular Orientation of CuPc Films and Optical Properties of Ultra-thin High-k Films: Optical Anisotropy and Molecular Orientation of CuPc Films and Optical Properties of Ultra-thin High-k Films". Doctoral thesis, 2011. https://monarch.qucosa.de/id/qucosa%3A19786.
Texto completoIn dieser Arbeit werden dünne Schichten aus Kupferphthalozyanin (CuPc) mittels spektroskopischer (in-situ) Ellipsometrie (SE) und (in-situ) Reflektions-Anisotropie-Spektroskopie (RAS) untersucht, um die optische Anisotropie in einer Ebene parallel und senkrecht zur Schichtoberfläche und die molekulare Orientierung zu bestimmen. CuPc ist ein aussichtsreicher Kandidat als organischer Halbleiter in organischen Feldeffekt-Transistoren, organischen Leuchtdioden und organischen Solarzellen. Vizinale Si(111)-Substrate sind wegen der Anisotropie in der Substratebene interessant, die durch die Treppen und Terrassen auf der Oberfläche verursacht wird. Die Stärke der Anisotropie der vizinalen Si(111)-Oberfläche ist vom Schnittwinkel (Offcut) abhängig. Es wird der Einfluss des Offcut-Winkels auf die molekulare Orientierung in dünnen CuPc-Schichten parallel und senkrecht zur Substratoberfläche untersucht. Die in-situ Untersuchungen von CuPc-Schichten weisen darauf hin, dass strukturelle Veränderungen beim Wachstum auftreten. Darüber hinaus wurden zwei unterschiedliche Oberflächenmodifizierungsschichten, um deren Wirkung auf die molekulare Orientierung von CuPc zu untersuchen, verwendet: eine OTS-Monoschicht mit aufrecht stehenden Molekülen und PTCDA-Schichten mit flach liegenden Molekülen. Metall-organische Grenzflächen spielen eine wichtige Rolle in organischen elektronischen Bauelementen. In-CuPc wird als Beispiel für ein Metall-organisches System durch in-situ SE und RAS untersucht. Wenn In thermisch auf eine CuPc-Schicht aufgedampft wird, diffundieren In-Atome zunächst in die darunterliegende CuPc-Schicht und bilden dann Cluster auf der Schicht. Hafniumdioxid (HfO2) ist ein heißer Kandidat für das Ersetzen des herkömmlich als Gate-Dielektrikum verwendeten SiO2 mit dem Ziel, die Leckströme bei der weiteren Verkleinerung mikroelektronischer Bauelemente zu minimieren. Um amorphe Schichten, die vorteilhaft zur Minimierung der Leckströme sind, zu erhalten, werden die HfO2-Schichten, die oft kristallin sind, mit Aluminiumoxid (Al2O3) (k-Wert: 9) kombiniert, das bei wesentlich höheren Temperaturen amorph bleibt. Zwei Serien von ultra-dünnen Proben wurden durch Atomlagenabscheidung hergestellt: Mischschichten HfxAl1-xOz und Doppelschichten HfO2 auf Al2O3. Die optischen Konstanten und Bandlücken wurden mittels SE im Energiebereich von 0,7 bis 10 eV bestimmt. Es hat sich gezeigt, dass die (effektive) Bandlücke der Misch- und Doppelschichten durch die Komposition abgestimmt werden kann. Nach Lagerung der High-k-Schichten für zwei Monate an Luft konnte ein Alterungseffekt beobachtet werden. Dieser wird auf die weitere Oxidation der dielektrischen Schichten, die durch Sauerstoffdiffusion aus der Umgebungsluft in die High-k-Schichten ermöglicht wird, zurückgeführt.