Bibliografías temáticas / Bande de transition programmable

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Literatura académica sobre el tema "Bande de transition programmable"

Autor: Grafiati
Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Bande de transition programmable"

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Abraitis, Vidas y Žydrūnas Tamoševičius. "Transition Test Patterns Generation for BIST Implemented in ASIC and FPGA". Solid State Phenomena 144 (septiembre de 2008): 214–19. http://dx.doi.org/10.4028/www.scientific.net/ssp.144.214.

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Transition delay testing of sequential circuits in a clocked environment is analyzed. There are presented two test pattern generator methods for built in self testing of the circuit implemented as Application Specific Integrated Circuit (ASIC) and Field Programmable Gate Array (FPGA) of Virtex family. Cellular automaton and Linear Feedback Shift Register (LFSR) structures are used for test sequence generation. The circuits are tested as the black boxes under Transition fault model. Experimental results of the test pattern generation methods are presented and analyzed. Results compared with exhaustive test of transition faults for ASICs and programmable integrated circuits with given configuration.
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2

Li, Jin, Zhilong Su, Hongjie Xu, Xiaodong Ma, Jie Yin y Xuesong Jiang. "Photo-Induced Programmable Morphological Transition of the Hybrid Coassembles". Macromolecular Chemistry and Physics 219, n.º 11 (17 de abril de 2018): 1800054. http://dx.doi.org/10.1002/macp.201800054.

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Wang, Jie, Wei Gao, Han Zhang, Minhan Zou, Yongping Chen y Yuanjin Zhao. "Programmable wettability on photocontrolled graphene film". Science Advances 4, n.º 9 (septiembre de 2018): eaat7392. http://dx.doi.org/10.1126/sciadv.aat7392.

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Surface materials with specific wettability play important roles in a wide variety of areas from science to industry. We present a novel paraffin-infused porous graphene film (PIPGF) with programmable wettability. Because of graphene’s photothermal property, the paraffin in the PIPGF was in transition between liquid and solid in response to near-infrared (NIR) light irradiation. Thus, we imparted the film with a dynamic and reversible transition between a slippery and a rough surface as the remotely tunable wettability. In addition, with the integration of NIR masks, the paraffin could melt at corresponding patterns on the PIPGF, which formed special flow pathways for the slipping droplets. Therefore, the PIPGF could provide programmable wettability pathways for the spatiotemporal droplet manipulation by flexibly changing the NIR masks. We demonstrated these programmable wettability pathways to not only simplify liquid handling in the microplates and droplet microarrays technology but also to provide distinctly microfluidic microreactors for different purposes, such as practical blood grouping diagnosis. These features indicated that the photocontrollable PIPGF would be amenable to a variety of applications, such as microfluidic systems, laboratory-on-a-chip settings, and droplet manipulations.
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4

Garanina, Natalia Olegovna, Igor Sergeevich Anureev, Vladimir Evgenyevich Zyubin, Sergey Mikhailovich Staroletov, Tatiana Victorovna Liakh, Andrey Sergeevich Rozov y Sergei Petrovich Gorlatch. "Temporal Logic for Programmable Logic Controllers". Modeling and Analysis of Information Systems 27, n.º 4 (20 de diciembre de 2020): 412–27. http://dx.doi.org/10.18255/1818-1015-2020-4-412-427.

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We address the formal verification of the control software of critical systems, i.e., ensuring the absence of design errors in a system with respect to requirements. Control systems are usually based on industrial controllers, also known as Programmable Logic Controllers (PLCs). A specific feature of a PLC is a scan cycle: 1) the inputs are read, 2) the PLC states change, and 3) the outputs are written. Therefore, in order to formally verify PLC, e.g., by model checking, it is necessary to describe the transition system taking into account this specificity and reason both in terms of state transitions within a cycle and in terms of larger state transitions according to the scan-cyclic semantics. We propose a formal PLC model as a hyperprocess transition system and temporal cycle-LTL logic based on LTL logic for formulating PLC property. A feature of the cycle-LTL logic is the possibility of viewing the scan cycle in two ways: as the effect of the environment (in particular, the control object) on the control system and as the effect of the control system on the environment. For both cases we introduce modified LTL temporal operators. We also define special modified LTL temporal operators to specify inside properties of scan cycles. We describe the translation of formulas of cycle-LTL into formulas of LTL, and prove its correctness. This implies the possibility ofmodel checking requirements expressed in logic cycle-LTL, by using well-known model checking tools with LTL as specification logic, e.g., Spin. We give the illustrative examples of requirements expressed in the cycle-LTL logic.
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Wu, Guangjian, Bobo Tian, Lan Liu, Wei Lv, Shuang Wu, Xudong Wang, Yan Chen et al. "Programmable transition metal dichalcogenide homojunctions controlled by nonvolatile ferroelectric domains". Nature Electronics 3, n.º 1 (enero de 2020): 43–50. http://dx.doi.org/10.1038/s41928-019-0350-y.

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Lim, Ho Sun, Seung Goo Lee, Dae Ho Lee, Dong Yun Lee, Shichoon Lee y Kilwon Cho. "Superhydrophobic to Superhydrophilic Wetting Transition with Programmable Ion-Pairing Interaction". Advanced Materials 20, n.º 23 (2 de diciembre de 2008): 4438–41. http://dx.doi.org/10.1002/adma.200801069.

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Ma, Biao, Jin Zhang, Gangsheng Chen, Yi Chen, Chengtao Xu, Lanjie Lei y Hong Liu. "Shape-Programmable Liquid Metal Fibers". Biosensors 13, n.º 1 (26 de diciembre de 2022): 28. http://dx.doi.org/10.3390/bios13010028.

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Conductive and stretchable fibers are the cornerstone of intelligent textiles and imperceptible electronics. Among existing fiber conductors, gallium-based liquid metals (LMs) featuring high conductivity, fluidity, and self-healing are excellent candidates for highly stretchable fibers with sensing, actuation, power generation, and interconnection functionalities. However, current LM fibers fabricated by direct injection or surface coating have a limitation in shape programmability. This hinders their applications in functional fibers with tunable electromechanical response and miniaturization. Here, we reported a simple and efficient method to create shape-programmable LM fibers using the phase transition of gallium. Gallium metal wires in the solid state can be easily shaped into a 3D helical structure, and the structure can be preserved after coating the wire with polyurethane and liquifying the metal. The 3D helical LM fiber offered enhanced stretchability with a high breaking strain of 1273% and showed invariable conductance over 283% strain. Moreover, we can reduce the fiber diameter by stretching the fiber during the solidification of polyurethane. We also demonstrated applications of the programmed fibers in self-powered strain sensing, heart rate monitoring, airflow, and humidity sensing. This work provided simple and facile ways toward functional LM fibers, which may facilitate the broad applications of LM fibers in e-skins, wearable computation, soft robots, and smart fabrics.
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Guntnur, Rohini Thevi, Nicolas Muzzio, Madison Morales y Gabriela Romero. "Phase transition characterization of poly(oligo(ethylene glycol)methyl ether methacrylate) brushes using the quartz crystal microbalance with dissipation". Soft Matter 17, n.º 9 (2021): 2530–38. http://dx.doi.org/10.1039/d0sm02169e.

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This work investigates the thermodynamic phase transition of poly(oligo(ethylene glycol)methyl ether methacrylate) brushes using the quartz crystal microbalance with dissipation for applications in programmable and controllable drug delivery.
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9

Jiang, Zhen, Ronny Javier Pibaque Sanchez, Idriss Blakey y Andrew K. Whittaker. "3D shape change of multi-responsive hydrogels based on a light-programmed gradient in volume phase transition". Chemical Communications 54, n.º 77 (2018): 10909–12. http://dx.doi.org/10.1039/c8cc06515b.

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Kim, Hyojoon, Xiaoqi Chen, Jack Brassil y Jennifer Rexford. "Experience-driven research on programmable networks". ACM SIGCOMM Computer Communication Review 51, n.º 1 (31 de enero de 2021): 10–17. http://dx.doi.org/10.1145/3457175.3457178.

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Many promising networking research ideas in programmable networks never see the light of day. Yet, deploying research prototypes in production networks can help validate research ideas, improve them with faster feedback, uncover new research questions, and also ease the subsequent transition to practice. In this paper, we show how researchers can run and validate their research ideas in their own backyards---on their production campus networks---and we have seen that such a demonstrator can expedite the deployment of a research idea in practice to solve real network operation problems. We present P4Campus , a proof-of-concept that encompasses tools, an infrastructure design, strategies, and best practices---both technical and non-technical---that can help researchers run experiments against their programmable network idea in their own network. We use network tapping devices, packet brokers, and commodity programmable switches to enable running experiments to evaluate research ideas on a production campus network. We present several compelling data-plane applications as use cases that run on our campus and solve production network problems. By sharing our experiences and open-sourcing our P4 apps [28], we hope to encourage similar efforts on other campuses.
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Tesis sobre el tema "Bande de transition programmable"

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Eshra, Islam. "Un FIRDAC programmable pour émetteurs RF re-configurable". Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS461.

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Le convertisseur numérique-analogique à réponse impulsionnelle finie (FIRDAC) proposé est programmable avec un ordre entièrement reconfigurable et des coefficients capables de fournir un ordre jusqu'à 62 et un rapport entre le coefficient maximum et minimum de 159. Cela a permis une large gamme de facteurs d'atténuation pouvant atteindre 100dB et une large gamme de bandes de transition normalisées (>0.0156). Le filtre FIRDAC a été conçu et implémenté en technologie CMOS 65 nm avec une surface active totale de 0,867 mm2. Au niveau du circuit, le FIRDAC peut atteindre une fréquence d'échantillonnage de 2,56 GHz pour une consommation en puissance moyenne de 9mW. Pour une entrée sinusoïdale, le filtre FIRDAC atteint un rapport signal sur bruit (SNR) jusqu'à 67,3 dB et une dynamique (SFDR) de 72 dBc. Les performances du filtre FIRDAC ont été testées dans des émetteurs QPSK, 16-QAM et 64-QAM avec OFDM et avec différentes largeurs de bande. Les simulations montrent un EVM (Error Vector Magnitude) de 2,66%, 1,9% et 2,29% respectivement. Une partie de ce travail concerne la conception du Front-End d’un émetteur RF programmable. Le Front-End RF est composé d'un mélangeur RF, d'un amplificateur de pré-puissance et d'un filtre LC réglable. Le Front-End RF complet a un gain programmable total de 23 dB avec un pas de 1,53 dB et capable de fonctionner sur une plage de 1,5 GHz à 5 GHz. La puissance RF de sortie maximale est de -11 dBm avec une consommation électrique de 23 mW. Les résultats montrent une dynamique (SFDR) maximum de -61,95 dBc pour deux tonalités à une fréquence porteuse de 4 GHz, tandis que pour un signal OFDM 16-QAM, l'EVM obtenu était de 4,76 %
The first part of this work relates to the design and implementation of a programmable Finite Impulse Response Digital to Analog Converter (FIRDAC). The programmability is in the filter's order (N-1) and its coefficients. The proposed FIRDAC is capable of providing an order up to 62 and a ratio between maximum to minimum coefficient up to 159. This allowed the filter to provide up to 100dB of attenuation and a wide range of normalized transition-band (>0.0156). The FIRDAC filter has been designed and implemented in 65nm CMOS with total active area 0.867mm2. The FIRDAC can operate up to 2.56 GHz of sampling frequency at an average power consumption of 9mW. For a single tone input, the FIRDAC filter managed to provide an SNR up to 67.3dB and a SFDR of 72dBc. The FIRDAC filter was tested with different modulation techniques: OFDM, 16-QAM OFDM and 64-QAM OFDM having different channel Bandwidth. The circuit achieved an Error Vector Magnitude (EVM) of 2.66%, 1.9% and 2.29% respectively, complying with the LTE and the 802.11ac standards. The second part of this work relates to the design of a programmable RF front-end circuit. The RF front-end is composed of an analog RF mixer, a programmable Pre-Power Amplifier (PPA) and a tunable LC tank. The whole RF front-end introduced a total programmable gain of 23dB with a gain step of 1.53dB operating in the 1.5GHz - 5GHz frequency range. The maximum output RF power is -11dBm with a power consumption of 23mW. Simulation result showed a maximum SFDR of -61.95dBc for two tones at a carrier frequency of 4GHz. While for a 16-QAM OFDM signal, the obtained EVM was 4.76%
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2

Lefevre, Pascal. "Conception et réalisation d'une source stable programmable en intégration monolithique, en bande K". Lille 1, 2000. http://www.theses.fr/2000LIL10099.

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De nombreux systemes de communication en gamme centimetrique et millimetrique connaissent un developpement considerable et concernent des applications nombreuses et variees, que ce soit des applications fixes, comme la communication entre stations de base, les systemes satellitaires multimedia en orbite basse ou moyenne ou la t. V distribution dans la bande 28-42 ghz ou encore des applications mobiles comme les reseaux locaux intra-batiment. La conception d'oscillateurs locaux (ol) a faible bruit de phase reste un point dur dans la mise en uvre de ces systemes de communication. Or les performances de bruit de ces sources determinent directement la capacite des equipements a transmettre l'information par voie hertzienne en terme de debit et de taux d'erreur par bit (teb). Ce travail de these a donc consiste a etudier de nouvelles architectures de sources stables programmables en frequence, integrables en technologie monolithique afin de minimiser le bruit de phase de ces sources. Cette etude d'architectures a debouche sur le choix d'une solution, basee sur l'utilisation d'une double boucle a verrouillage de phase et de frequence. Nous avons ensuite concu et realise les differents circuits necessaires a la realisation d'un demonstrateur. Ce demonstrateur a ensuite ete assemble, caracterise et donne d'assez bons resultats notamment en terme de bruit de phase.
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Brevier, Robert. "Admittance-mètre large bande programmable utilisant une méthode de comparaison : application à la caractérisation de composants semiconducteurs". Toulouse, INPT, 1987. http://www.theses.fr/1987INPT083H.

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Brevier, Robert. "Admittance-mètre large bande programmable utilisant une méthode de comparaison application à la caractérisation de composants semiconducteurs /". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376034455.

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Rouault, Philippe. "Les matériaux intermétalliques terres rares - métaux de transition et instabilité de l'antiferromagnétisme de bande". Grenoble 1, 1989. http://www.theses.fr/1989GRE10105.

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Nous presentons dans la premiere partie les avantages d'une fusion en levitation pour la preparation de composes intermetalliques terres rares-metaux de transition destines, a l'etude du magnetisme itinerant. Viennent ensuite les caracteristiques techniques du four a levitation que nous avons realise puis des exemples d'applications d'un tel procede d'elaboration. Dans la seconde partie, nous contribuons a l'etude de l'antiferromagnetisme de bande proche de l'instabilite a travers certaines phases de laves rmn#2. Grace aux informations experimentales sur les interactions d'echange extraites des diagrammes de diffraction neutronique et sur l'anisotropie, apprehendee a partir de spectres de resonance magnetique nucleaire, nous proposons un nouvel arrangement des moments magnetiques des atomes de manganese au sein de la structure magnetique du compose ymn#2. Nous discutons des effets de la frustration des interactions d'echange et de la forte anisotropie du manganese dans ce compose. Nous etudions egalement les proprietes magnetiques des composes pseudo-binaires y#1##xtb#xmn#2: la substitution d'atomes de terbium a ceux d'yttrium introduit, en sus de la tres forte frustration des interactions d'echange qui existent deja dans le compose ymn#2, une competition des energies d'anisotropie du terbium et du manganese. Il en resulte un ordre magnetique homogene complexe ainsi que l'apparition d'un ordre a courte distance que nous avons plus particulierement etudie dans le compose tbmn#2. Le terbium joue dans ce cas, le role d'une sonde des correlations de densite d'aimantation du manganese
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Raboin, Jean-Christophe. "Complexes de métaux de transition pour la photosensibilisation de semi-conducteurs à large bande interdite". Metz, 1999. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1999/Raboin.Jean_Christophe.SMZ9940.pdf.

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Des ligands tridentates de la famille des terpyridines et des analogues cyclométallants ainsi que des ligands bidentates 5-(2-pyridyl)-tétrazoles sont préparés. Ces ligands sont fonctionnalisés par des acides carboxyliques vicinaux pour obtenir une bonne fixation et un transfert de photoélectron maximum sur TiO2 ou par des coumarines condensées pour augmenter l'efficacité de captation de la lumière et accéder à des états excités de plus basse énergie. Les ligands sont utilisés pour coordiner des cations de Ru, Fe et Rh. Des problèmes de décarboxylation sélective ou d'absence de cyclométallation lors de l'utilisation de phenylbipyridines à coumarines condensées sont résolus. Un cas de cyclométallation de pyridine par retournement de cycle est observé. Une corrélation entre les potentiels rédox et les groupes fonctionnels des complexes est établie ainsi que des effets auxo- et hyperchrome en spectroscopie d'absorption. La plupart des complexes sont émetteurs à température ambiante dont certains avec des rendements d'émission proches de Ru(bipy)3Cl2. Les complexes de ruthénium porteurs d'acides carboxyliques sont testés en photosensibilisation sur électrodes de TiO2. Des rendements de conversion de photon en courant jusqu'à plus de 70% sont atteints
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7

Elrifai, Emad. "Conception de lignes, transition, composants en technologies verre-silicium dans la bande (57-66)GHz". Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1037/document.

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La montée en fréquence jusqu'à 60 GHz dans la bande de fréquences millimétriques, qui devrait permettre des débits supérieurs de l'ordre de 5 à 7 Gb/s environ, a été la réponse aux exigences croissantes des systèmes de télécommunication haut débit. Cette montée nécessite la réalisation de circuits actifs ou passifs plus intégrés avec de hautes performances.Dans ce travail de thèse, nous utilisons la technologie LGP (Ligne de Goubau Planaire) à 60 GHz : un ruban métallique est placé sur un diélectrique sans plan de masse dans le cas des circuits planaires, nous utilisons un diélectrique composé d'une bicouche (une couche de silicium haut résistivité au-dessus d'une couche de verre) en prenant en compte le plateau métallique du banc de mesure dans les simulations.Pour montrer l'efficacité de cette technologie à 60 GHz, plusieurs circuits passifs ont été développés et caractérisés: des lignes de transmission (qui ont montré de très faibles pertes, ainsi qu'un facteur de qualité Q très élevé), des transitions coplanaire/LGP, des filtres à base de résonateurs en boucle carrée ouverte, et un filtre passe-bas à saut d'impédance.Les mesures en concordance avec les résultats de simulations électromagnétiques et électriques ont validé l'utilisation de la technologie LGP pour la réalisation de filtres passe-bande et passe-bas à 60GHz
The rise in frequency band till 60 GHz in millimeter frequency-band, which should provide high data rate up to 5 or 7 Gb/s, has been the response to the increasing demands for high data rate telecommunication systems. This rising in frequency spectrum requires active or passive circuits more integrated with high performances.In this work we use the PGL technology (Planar Goubau Line) at 60 GHz: a metal strip deposited on a dielectric substrate without ground plane, the dielectric in our case is a bilayer substrate (High Resistivity silicon over Glass), we take into account in the simulations the measure bench metal plate.To show the efficiency of PGL technology at 60 GHz, several passive circuits have been fabricated and characterized: Transmission Lines (of low transmission losses with high quality factor Q), Coplanar/ PGL transition, filters based on square open-loop resonators, and a stepped impedance low pass filter.The agreement between the measurement and simulations validate this technology for the fabrication of low-pass and bandpass filters
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8

Cardinali, François. "Synthèse de nouveaux dérivés du C60 et de complexes de métaux de transition à bande de transfert de charge". Université Louis Pasteur (Strasbourg) (1971-2008), 2005. https://publication-theses.unistra.fr/public/theses_doctorat/2005/CARDINALI_Francois_2005.pdf.

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La présente thèse relate la synthèse de nouveaux dérivés du C60 et de complexes de métaux de transition à bande de transfert de charge. La découverte du C60 en 1985, suivie de celle des autres fullerènes, a suscité un renouvellement de l'intérêt de la communauté scientifique pour la chimie du carbone. Le C60, le plus abondant des fullerènes, a la structure d'un ballon de football. Après la mise au point de sa synthèse à l'échelle du gramme, en 1990, il a été possible de s'intéresser à ses propriétés. Il s'est révélé un excellent accepteur d'électron et/ou d'énergie. De ce fait, la synthèse et l'étude des propriétés électroniques de systèmes du type fullerène-donneur ont fait l'objet de nombreuses recherches au cours des dernières années. Dans ce contexte, nous avons synthétisé des dérivés covalents combinant le C60 à des complexes de métaux de transition, dont la capacité à donner des électrons est connue. Des études photophysiques ont ensuite été menées, et du transfert d'électron a été mis en évidence. Par la suite, nous nous sommes attelés à développer une approche supramoléculaire permettant d'associer le C60 à un chromophore donneur oligophénylènevinylène (OPV) par des liaisons non-covalentes, en l'occurrence des liaisons hydrogène entre deux ammoniums porteurs de C60 et un éther-couronne 18-O-6 OPV. Un effet coopératif a été mis en évidence lors de la complexation, dû aux interactions entre fullerènes
The current manuscript presents the synthesis of new C60 derivatives bearing transition metal complexes. The discovery of C60 in 1985, followed by that of the other fullerenes, renewed the interest of the scientific community for the chemistry of the carbon element. C60, the most abundant fullerene, has the shape of a football. After its synthesis was realised on the scale of one gram, in 1990, its properties were studied. It proved to be an excellent electron and/or energy acceptor. Therefore, the synthesis and the electronic properties of fullerene-donor systems have been largely investigated on the last decade. We thus synthesised covalent C60 derivatives bearing transition metal complexes, which are known to be electron donors. Photophysical studies proved the presence of electron transfer deactivation pathways in our systems. We also developed a supramolecular approach associating C60 with an oligophenylenevinylene (OPV) donor through non-covalent bonds, in our case H-bonds between two C60-ammonium derivatives and an 18-O-6 crown-ether bearing an OPV. A cooperative effect was evidenced through complexation studies, due to fullerene-fullerene interactions
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Frigui, Nejm Eddine. "Maintenance automatique du réseau programmable d'accès optique de très haut débit". Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2019. http://www.theses.fr/2019IMTA0127/document.

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Les réseaux optiques passifs (PONs, Passive Optical Networks) représentant l’une des solutions les plus performantes du réseau d’accès FTTH ont été largement déployés par les opérateurs grâce à leur capacité d’offrir des services de très haut débit. Cependant, en raison de la dynamicité du trafic des différents clients, ces réseaux doivent s’appuyer sur un mécanisme efficace pour l’allocation de ressources, plus particulièrement dans le sens montant. Ce mécanisme est actuellement limité par la nature statique des paramètres SLA (Service Level Agreement). Ceci peut avoir une influence négative sur la qualité de service ressentie par les utilisateurs. L’objectif de cette thèse est de proposer une nouvelle architecture pour optimiser l’allocation de ressources dans les réseaux PON tout en agissant uniquement sur les paramètres SLA, désignés comme des paramètres gérables par l’opérateur. Des techniques de classification basées sur l’apprentissage automatique et la prédiction sont utilisées pour analyser le comportement des différents utilisateurs et déterminer leurs tendances de trafic. Un ajustement dynamique sur la base du concept autonomique de certains paramètres SLA est ensuite effectué afin de maximiser la satisfaction globale des clients vis-à-vis du réseau
Passive Optical Network (PON) representing one of the most attractive FTTH access network solutions, have been widely deployed for several years thanks to their ability to offer high speed services. However, due to the dynamicity of users traffic patterns, PONs need to rely on an efficient upstream bandwidth allocation mechanism. This mechanism is currently limited by the static nature of Service Level Agreement (SLA) parameters which can lead to an unoptimized bandwidth allocation in the network. The objective of this thesis is to propose a new management architecture for optimizing the upstream bandwidth allocation in PON while acting only on manageable parameters to allow the involvement of self-decision elements into the network. To achieve this, classification techniques based on machine learning approaches are used to analyze the behavior of PON users and to specify their upstream data transmission tendency. A dynamic adjustment of some SLA parameters is then performed to maximize the overall customers’ satisfaction with the network
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Rale, Pierre. "Multi-transition solar cells with localised states". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066541/document.

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Ce travail s’intéresse aux cellules solaires multi-transitions. Deux semiconducteurs à niveaux subbandgap : un highly mismatched alloy, le GaAsPN, et un absorbeur à boites quantiques. Les états subbandgap permettent de modifier l’énergie de gap ou de créer une bande intermédiaire au milieu du gap. En premier lieu, une introduction de la cellule solaire par l’étude de luminescence est présentée. Des liens entre luminescence et propriétés électriques sont établis, et les limites thermodynamiques de l’efficacité des dispositifs multi-transitions sont explicitées. Enfin, une méthode optique de caractérisation des cellules solaires est démontrée. La première partie expérimentale de la thèse est dédiée au développement d’une top cell en GaAsPN en accord de maille avec une bottom cell en Silicium. Des simulations numériques ont mis en évidence les difficultés à surmonter pour ce type de matériau. La dynamique des porteurs a été étudiée par photoluminescence en régime permanent et résolue en temps. Ces mesures ont mis en évidence que les absorbeurs crûs souffraient d’états fortement localisés, majoritairement dus à des clusters d’azote. Ces états nous ont permis en revanche d’étudier les propriétés de bande intermédiaire de cet alliage. Enfin, une méthode optique de caractérisation, adaptée aux IBSCs et à la mise en évidence des deux mécanismes clés de ce concept (two-step two-photon absorption et la préservation de la tension). Cette méthode a été appliquée à deux candidats pour les IBSCs, un absorbeur à multi-puits quantiques et un à boîtes quantiques. Les résultats montrent que l’absorbeur à boîtes quantiques présente un comportement compatible avec les IBSCs
This thesis deals with the multi-transition solar cells by studying two subband gap localised states materials: one highly mismatched alloy, GaAsPN, and one multi-stacked quantum dots heterostructure. These subband gap states give the possibility to tune the band gap energy or create two photon transitions inside a single the absorber. In a first part, a radiance based introduction of the solar cell is presented. Links between radiances and electrical properties are pointed out. From this analysis, the thermodynamic limits of the single and multiple transition solar cells are derived and key mechanisms for multi-transition solar cells are identified. A universal optical characterisation method for probing electrical properties of solar cells is displayed. The first experimental part of this thesis was dedicated to the development of a GaAsPN based pin top cell lattice matched with a Silicon bottom cell. Numerical simulations have been carried out. Carrier dynamics has been studied by steady-state and time-resolved photoluminescence, with the conclusion that the GaAsPN we grew still suffer from multiple strongly localised states below the band gap, mainly due to N-clusters. Finally, we have taken advantages of the strong carrier localisation for a use as an intermediate band solar cell. Eventually, a quantitative optical characterisation method was developed in order to evaluate the potential of an absorber as an IBSC. The two key processes, the two-step two-photon absorption and the voltage preservation, can be widely investigate through it. This method has been applied to two IBSC candidates, a MQW and a MSQD absorbers. The MSQD cell have shown IB compatibility
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Libros sobre el tema "Bande de transition programmable"

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1936-1984, McMillan William L., Hutiray Gy, So lyom J y International Conference on Charge Density Waves in Solids (1984 : Budapest, Hungary)., eds. Charge density waves in solids: Proceedings of the International Conference held in Budapest, Hungary, September 3-7, 1984. Berlin: Springer-Verlag, 1985.

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Capítulos de libros sobre el tema "Bande de transition programmable"

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Lu, Yandu, Xu Zhang, Hanzhi Lin y Anastasios Melis. "Engineering Microalgae: Transition from Empirical Design to Programmable Cells". En Algal Biotechnology, 1–31. GB: CABI, 2023. http://dx.doi.org/10.1079/9781800621954.0001.

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Capmany, José y Daniel Pérez. "Basic Building Blocks and Techniques". En Programmable Integrated Photonics, 38–77. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198844402.003.0002.

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Programmable integrated photonics (PIP) relies on designing suitable basic building blocks (BBBs) able to carry elementary signal processing operations and interconnection hardware architectures that offer very high spatial regularity. The most popular BBBs proposed so far are based on elementary 2×2 tunable photonics coupling components capable of providing independent setting of the power coupling ratio. Additionally, they are based on the phase shift experienced by the incoming signals from two input waveguides in their transition to the two output waveguide ports of the device. This chapter deals primarily with these components. First, it considers the basic matrix methods required to describe their operation, either standalone or in combination with others to form more complex structures. Next, it describes the main technology approaches for the implementation of BBBs, including 3dB Mach–Zehnder tunable couplers, directional couplers, and beamsplitters, followed by how these BBBs are employed to build up a tunable basic unit (TBU), which is the elementary constituent of waveguide mesh circuits. It concludes by describing the devices and techniques relevant in multiport devices, and discusses the equivalence between mode conversion and linear optics matrix transformations and the universal linear combiner.
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Ba, Abdoul Hameth. "1. Le Sahel, bande de transition et couloir de circulation". En Acteurs et territoires du Sahel, 33–46. ENS Éditions, 2007. http://dx.doi.org/10.4000/books.enseditions.910.

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Mahmoud, Imbaby I. "Implementation of Reactor Control Rod Position Sensing/Display Using a VLSI Chip". En Field-Programmable Gate Array (FPGA) Technologies for High Performance Instrumentation, 1–16. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0299-9.ch001.

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The chapter describes the use of CPLDs and FPGAs devices in Nuclear Power Plant (NPP) Instruments. The design, simulation, implementation and test of a reactor control rod position sensing electronic unit intended as a replacement of the outdated Russian type in old power reactors is presented. The signals are generated from12 ring-shaped pair of inductively coupled coils surrounding the reactor moving rod. The implementation involves both analog and digital design. The designed digital circuit has 12 TTL outputs working in a 1-out-of-12 mode, excluding both double [2-out-of-12] and no-output state. To avoid a flickering display during transition between two neighboring positions, some sort of hysteresis is implemented. One time this hysteresis is implemented through a state machine deriving up/down counter. The state machine is synthesized targeting a Xilinx Spartan XL device. To reduce the possibility of power failure effects, another circuit consists of combinatorial logic and implemented in CPLD is presented. However, energy harvesting methods in NPPs can support counter based design.
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Actas de conferencias sobre el tema "Bande de transition programmable"

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Sandoval, Nathan, Casey Mackin, Sean Whitsitt, Roman Lysecky y Jonathan Sprinkle. "Runtime hardware/software task transition scheduling for data-adaptable embedded systems". En 2013 International Conference on Field-Programmable Technology (FPT). IEEE, 2013. http://dx.doi.org/10.1109/fpt.2013.6718382.

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Wong, Justin S. J., Pete Sedcole y Peter Y. K. Cheung. "A transition probability based delay measurement method for arbitrary circuits on FPGAs". En 2008 International Conference on Field-Programmable Technology (FPT). IEEE, 2008. http://dx.doi.org/10.1109/fpt.2008.4762372.

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Jeanneret, B., F. Overney, A. Rufenacht y J. Nissila. "Transition shape effect in the transients generated by a Programmable Josephson Voltage Standard". En 2010 Conference on Precision Electromagnetic Measurements (CPEM 2010). IEEE, 2010. http://dx.doi.org/10.1109/cpem.2010.5544163.

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Baklanov, Nikolay, Xuedong Yang, Maxim Klyuzhev y Ben Durand. "Wireline Tractor System with User Programmable Behaviors for Semi-Autonomous Restriction Navigation". En SPE/ICoTA Well Intervention Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212876-ms.

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Abstract A semi-autonomous wireline tractor solution for casedhole applications enabling navigation through complex restrictions with minimal operator interaction in absence of digital telemetry is presented. The robotic conveyance technology provides a foundation for applications where programming of tractoring behaviors is available to field personnel as a part of the job design. Digital telemetry may not be available for wireline tractor tools. A conveyance system with programmable behaviors allows downhole navigation when conventional telemetry is nonexistent or has prohibitively low bandwidth or a protocol conflict, which is relevant in configurations with third-party tools. The presented control technology utilizes downhole on-board measurements with tracking and decoding of head voltage waveforms where electrical power is supplied by the surface system. Voltage is set by an operator to fall into one of several predefined bands representing specific tool commands that trigger a set of robotic sequences. The logging cable can be freed to carry a high-frequency communication signal to payload tools while powering both the tractor and its payload. Although the tractor does not have feedback through its telemetry data, tractor operational condition can be derived from the variations of electrical current measured at surface. A head voltage stabilization system along with a load calibration method compensates voltage fluctuations due to load changes and losses in the logging cable. An advanced signal-processing algorithm implemented in downhole embedded software quantizes denoised voltage and reliably maps it to operational bands, effectively eliminating transient processes resulting from high-power jobs. The voltage estimation technique supports a finite set of commands to be interpreted by the downhole tools and to activate control logic implemented as scripted state machines with a core based on the deterministic finite automaton concept. Behaviors scripted and parametrized by an operator in custom metalanguage use a dictionary of actions and conditions provided by the embedded software that runs the tools. Controllers may be designed and put into action by nonprogrammers to solve restriction navigation needs for a known well completion. The availability of design and simulation software aids job planning. Multiple tractor configurations with individually controlled arms were successfully tested at locations in the USA and Eurasia, with and without third-party tools with their own telemetry. Reliable restriction navigation using preprogrammed behaviors controlled by voltage levels has been demonstrated. The design opens development opportunities for other semi-autonomous downhole applications. Run-time pattern recognition of electrical current in the software enables further automation of the surface power system to drive the downhole navigation, detect and respond to anomalies, and reliably manipulate voltage transitions. The presented technology removes the compatibility barrier between different telemetry systems and elevates flexibility of systems lacking telemetry while preserving their usability and robustness.
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Bolsens, Ivo. "Pushing the boundaries of Moore's Law to transition from FPGA to All Programmable Platform". En ISPD '17: International Symposium on Physical Design. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3036669.3041226.

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Clapa, Damien J., Elizabeth A. Croft y Anthony J. Hodgson. "Programmable Compliance and Equilibrium Point Control of a 2-DOF Manipulator Performing Free-Space, Contact and Transition Tasks". En ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59351.

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Programmable mechanical compliance (PMC) in actuation is desirable for human interaction tasks and important for producing biomimetic motion. In this paper, the equilibrium point (EP) hypothesis is proposed and implemented as a strategy for controlling programmable compliance. A two-DOF planar manipulator activated by McKibben actuators was constructed for the purpose of demonstrating the application of the equilibrium point hypothesis on a robotic platform. The equilibrium angle and stiffness of each of the joints on the manipulator can be independently programmed. The results presented herein show stable behavior for free motion, interaction and transition tasks using the EP hypothesis implemented with a linear PI control strategy.
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Lukin, A. y O. Gülseren. "ENHANCED ENERGY RELEASE IN NANOENERGETIC MATERIALS THROUGH SELF-SYNCHRONIZED COLLECTIVE ATOMIC VIBRATIONS IN LOW-DIMENSIONAL NANOCARBON TRANSITION INTERFACES". En Proceedings of the 10th INTERNATIONAL SEMINAR ON FLAME STRUCTURE Novosibirsk, Russia October 9-13, 2023. Crossref, 2023. http://dx.doi.org/10.53954/9785605098669_144.

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This research paper introduces an innovative approach to unlocking enhanced energy release in nanoenergetic materials by harnessing self-synchronized collective atomic vibrations within the multilayer transition domains of coatings. Our approach involves integrating finely-tuned 2D-ordered linear-chain carbon-based multilayer nano-enhanced interfaces as programmable nanodevices into the transition domains of nanoenergetic material components using a technologically advanced multistage process. We employ a combination of techniques to activate and fine-tune the synergistic effects in the nano-enhanced interfaces. In addition, we incorporate a data-driven inverse design strategy based on the carbon nanomaterial genome approach, derived from multifactorial neural network-based predictive models. By leveraging these models we uncover the hidden structure-property relationships that govern the growth and properties of the nano-enhanced interfaces to maximize energy release efficiency.
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Small, Evan, Sadegh M. Sadeghipour y Mehdi Asheghi. "Numerical Modeling of Heat Transfer and Phase Transition in Programming the Ovonic Unified Memory Cells". En ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73188.

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An Ovonic Unified Memory (OUM) cell is a semiconductor device that stores data by a thermally induced phase transition between polycrystalline (set) and amorphous (reset) states in a thin film of chalcogenide alloy. The small volume of active media acts as a programmable resistor switching between a high (amorphous) and low (crystalline) resistance state. The change in the film resistivity (>40X dynamic range) caused by this rapid, reversible structural change is measured to detect the state of the cell (set or reset) for read out. OUM can benefit from a simulator capable of predicting the electrical, thermal, and crystallization behavior for design and optimization, particularly at the present stage of the development. This paper reports on the efforts being made to prepare such a numerical simulator, using an existing finite element computer code as the source for thermal and electrical modeling, and a custom crystallization code for phase prediction. Heat generation in the device is by Joule heating and is achieved by passage of the electric current, which is obtained from the electrical simulation. This result appears in the heat source term of the heat transfer equation that is solved for thermal modeling. As the first attempt the Ohmic current-voltage relation was implemented successfully to simulate set and reset in a two dimensional model of OUM. Solution of the drift-diffusion equation is now underway to capture the semiconductor behavior of the I-V curve. A good progress is made however, still more works needs to be done to fully implement the drift diffusion equation.
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Kanai, Satoshi y Takeshi Kishinami. "A Virtual Verification Environment for the Sequence Control System Using VRML and JAVA". En ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/cie-9032.

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Abstract This paper describes a visual simulation tool for reliable off-line development, verification and debugging of the control code of the Programmable Logic Controller (PLC) in the sequence control system. First, we discuss the uniform modeling method of the dynamic behavior of various components in a factory (actuators, sensors, operating panels, etc.) as the object model and state transition model. Then we propose the implementation method of the object model by VRML and JAVA. They enable us to uniformly describe the state-transition and corresponding dynamic behavior of the 3-D geometry of each object model. Moreover, we can use a standard VRML viewer which has the event-driven execution mechanism as a visual simulation tool. The effectiveness of proposed implementation and simulation is confirmed through the case study on the co-simulation of combining the component model with a real PLC.
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Merced, Emmanuelle, Rafmag Cabrera, Noraica Da´vila, Nelson Sepu´lveda y Fe´lix E. Ferna´ndez. "Multifunctional Micro-Mechanical Memory Devices". En ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4965.

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Two types of micro-mechanical memory cells are introduced in this paper. The programmable parameters are the resonant frequency of a micro-mechanical bridge and the tip deflection of a micro-mechanical cantilever. For both cases, the actuation was done by laser pulses that locally heated the vanadium dioxide (VO2) thin film coating. Due to the hysteretic behavior of the mechanical properties of the VO2 film coating across the transition, a different “memory state” was programmed with every pulse. The memory state remained programmed after the pulse ended, as long as the sample was maintained at a specific temperature (programming temperature) by using a Peltier heater. The resetting of the mechanical memory cell was accomplished by driving the temperature to regions outside the hysteretic region.
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