Готові списки джерел за темами / Monolithic coupling

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Добірка наукової літератури з теми "Monolithic coupling"

Автор: Grafiati

Опубліковано: 17 серпня 2022

Оновлено: 12 вересня 2022

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Статті в журналах з теми "Monolithic coupling"

Sememya, Roman, Artem Vilenskiy, and Sergey Chernyshev. "Design of RF filters with high selectivity on monolithic ceramic blocks." ITM Web of Conferences 30 (2019): 06001. http://dx.doi.org/10.1051/itmconf/20193006001.

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The paper presents the results of the development of quasielliptic filters on monolithic ceramic blocks. A circuit analysis of equivalent filter circuits is carried out using the coupling matrix method. A novel topology of a monolithic filter is being studied with the aim of obtaining increased frequency-selective properties due to the implementation of the attenuation poles. High cross-coupling values on ceramic monoliths with large inner metalized holes were obtained. The engineering method of adjusting the frequency position of the attenuation poles by trimming capacitive stubs is realized. Based on the performed analysis, as well as electromagnetic modeling, a monolithic ceramic filter was manufactured. The measurements results of the S-parameters for obtained models are presented.

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Sabarudin, Akhmad, Shin Shu, Kazuhiro Yamamoto, and Tomonari Umemura. "Preparation of Metal-Immobilized Methacrylate-Based Monolithic Columns for Flow-Through Cross-Coupling Reactions." Molecules 26, no. 23 (December 3, 2021): 7346. http://dx.doi.org/10.3390/molecules26237346.

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With the aim of developing efficient flow-through microreactors for high-throughput organic synthesis, in this work, microreactors were fabricated by chemically immobilizing palladium-, nickel-, iron-, and copper-based catalysts onto ligand-modified poly(glycidyl methacrylate-co-ethylene dimethacrylate) [poly(GMA-co-EDMA)] monoliths, which were prepared inside a silicosteel tubing (10 cm long with an inner diameter of 1.0 mm) and modified with several ligands including 5-amino-1,10-phenanthroline (APHEN), iminodiacetic acid (IDA), and iminodimethyl phosphonic acid (IDP). The performance of the resulting microreactors in Suzuki−Miyaura cross-coupling reactions was evaluated, finding that the poly(GMA-co-EDMA) monolith chemically modified with 5-amino-1,10-phenanthroline as a binding site for the palladium catalyst provided an excellent flow-through performance, enabling highly efficient and rapid reactions with high product yields. Moreover, this monolithic microreactor maintained its good activity and efficiency during prolonged use.

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Nagaki, Aiichiro, Katsuyuki Hirose, Yuya Moriwaki, Masahiro Takumi, Yusuke Takahashi, Koji Mitamura, Kimihiro Matsukawa, Norio Ishizuka, and Jun-ichi Yoshida. "Suzuki–Miyaura Coupling Using Monolithic Pd Reactors and Scaling-Up by Series Connection of the Reactors." Catalysts 9, no. 3 (March 25, 2019): 300. http://dx.doi.org/10.3390/catal9030300.

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The space integration of the lithiation of aryl halides, the borylation of aryllithiums, and Suzuki–Miyaura coupling using a Pd catalyst supported by a polymer monolith flow reactor without using an intentionally added base was achieved. To scale up the process, a series connection of the monolith Pd reactor was examined. To suppress the increase in the pressure drop caused by the series connection, a monolith reactor having larger pore sizes was developed by varying the temperature of the monolith preparation. The monolithic Pd reactor having larger pore sizes enabled Suzuki–Miyaura coupling at a higher flow rate because of a lower pressure drop and, therefore, an increase in productivity. The present study indicates that series connection of the reactors with a higher flow rate serves as a good method for increasing the productivity without decreasing the yields.

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Jüttner, Matthias, Andreas Pflug, Markus Wick, and Wolfgang M. Rucker. "Experimental evaluation of numerical errors for multi-physics coupling methods using disparate meshes." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 5 (September 4, 2017): 1517–25. http://dx.doi.org/10.1108/compel-02-2017-0072.

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Purpose Multiphysics problems are solved either with monolithic or segregated approaches. For accomplishing contrary discretisation requirements of the physics, disparate meshes are essential. This paper is comparing experimental results of different interpolation methods for a segregated coupling with monolithic approaches, implemented using a global and a local nearest neighbour method. The results show the significant influence of discretisation for multiphysics simulation. Design/methodology/approach Applying disparate meshes to the monolithic as well as the segregated calculation of finite element problems and evaluating the related numerical error is content of the contribution. This is done by an experimental evaluation of a source and a material coupling applied to a multiphysics problem. After an introduction to the topic, the evaluated multiphysics model is described based on two bidirectional coupled problems and its finite element representation. Afterwards, the considered methods for approximating the coupling are introduced. Then, the evaluated methods are described and the experimental results are discussed. A summary concludes this work. Findings An experimental evaluation of the numerical errors for different multiphysics coupling methods using disparate meshes is presented based on a bidirectional electro-thermal simulation. Different methods approximating the coupling values are introduced and challenges of applying these methods are given. It is also shown, that the approximation of the coupling integrals is expensive. Arguments for applying the different methods to the monolithic and the segregated solution strategies are given and applied on the example. The significant influence of the mesh density within the coupled meshes is shown. Since the projection and the interpolation methods do influence the result, a careful decision is advised. Originality/value In this contribution, existing coupling methods are described, applied and compared on their application for coupling disparate meshes within a multiphysics simulation. Knowing their performance is relevant when deciding for a monolithic or a segregated calculation approach with respect to physics dependent contrary discretisation requirements. To the authors’ knowledge, it is the first time these methods are compared with a focus on an application in multiphysics simulations and experimental results are discussed.

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Yu, Yun Seop, and Sung Kyu Lim. "Device Coupling Effects of Monolithic 3D Inverters." Journal of information and communication convergence engineering 14, no. 1 (March 31, 2016): 40–44. http://dx.doi.org/10.6109/jicce.2016.14.1.040.

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Huclová, Jitka, Dalibor Šatı&#x;nský, and Rolf Karlı&#x;ček. "Coupling of monolithic columns with sequential injection technique." Analytica Chimica Acta 494, no. 1-2 (October 2003): 133–40. http://dx.doi.org/10.1016/s0003-2670(03)00902-4.

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González, A. J., A. Peiró, P. Conde, L. Hernández, L. Moliner, A. Orero, M. J. Rodríguez-Álvarez, et al. "Monolithic crystals for PET devices: Optical coupling optimization." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 731 (December 2013): 288–94. http://dx.doi.org/10.1016/j.nima.2013.05.049.

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Ahn, Donghwan, Ching-yin Hong, Lionel C. Kimerling, and Jurgen Michel. "Coupling efficiency of monolithic, waveguide-integrated Si photodetectors." Applied Physics Letters 94, no. 8 (February 23, 2009): 081108. http://dx.doi.org/10.1063/1.3089359.

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Rothe, Steffen, Patrick Erbts, Alexander Düster, and Stefan Hartmann. "Monolithic and partitioned coupling schemes for thermo-viscoplasticity." Computer Methods in Applied Mechanics and Engineering 293 (August 2015): 375–410. http://dx.doi.org/10.1016/j.cma.2015.05.002.

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Monguchi, Yasunari, Fumika Wakayama, Shun Ueda, Ryo Ito, Hitoshi Takada, Hiroshi Inoue, Akira Nakamura, Yoshinari Sawama, and Hironao Sajiki. "Amphipathic monolith-supported palladium catalysts for chemoselective hydrogenation and cross-coupling reactions." RSC Advances 7, no. 4 (2017): 1833–40. http://dx.doi.org/10.1039/c6ra24769e.

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Більше джерел

Дисертації з теми "Monolithic coupling"

Clewell, Matthew John. "Reducing signal coupling and crosstalk in monolithic, mixed-signal integrated circuits." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/18138.

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Master of Science
Department of Electrical Engineering
William B. Kuhn
Designers of mixed-signal systems must understand coupling mechanisms at the system, PC board, package and integrated circuit levels to control crosstalk, and thereby minimize degradation of system performance. This research examines coupling mechanisms in a RF-targeted high-resistivity partially-depleted Silicon-on-Insulator (SOI) IC process and applying similar coupling mitigation strategies from higher levels of design, proposes techniques to reduce coupling between sub-circuits on-chip. A series of test structures was fabricated with the goal of understanding and reducing the electric and magnetic field coupling at frequencies up to C-Band. Electric field coupling through the active-layer and substrate of the SOI wafer is compared for a variety of isolation methods including use of deep-trench surrounds, blocking channel-stopper implant, blocking metal-fill layers and using substrate contact guard-rings. Magnetic coupling is examined for on-chip inductors utilizing counter-winding techniques, using metal shields above noisy circuits, and through the relationship between separation and the coupling coefficient. Finally, coupling between bond pads employing the most effective electric field isolation strategies is examined. Lumped element circuit models are developed to show how different coupling mitigation strategies perform. Major conclusions relative to substrate coupling are 1) substrates with resistivity 1 kΩ·cm or greater act largely as a high-K insulators at sufficiently high frequency, 2) compared to capacitive coupling paths through the substrate, coupling through metal-fill has little effect and 3) the use of substrate contact guard-rings in multi-ground domain designs can result in significant coupling between domains if proper isolation strategies such as the use of deep-trench surrounds are not employed. The electric field coupling, in general, is strongly dependent on the impedance of the active-layer and frequency, with isolation exceeding 80 dB below 100 MHz and relatively high coupling values of 40 dB or more at upper S-band frequencies, depending on the geometries and mitigation strategy used. Magnetic coupling was found to be a strong function of circuit separation and the height of metal shields above the circuits. Finally, bond pads utilizing substrate contact guard-rings resulted in the highest degree of isolation and the lowest pad load capacitance of the methods tested.

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Comeau, Jonathan P. "Integration Issues Associated with Monolithic Silicon-Germanium Microwave Radar Systems." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13990.

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Active electronically scanned array (AESA) radar systems for military and commercial applications have fueled interest in low-cost, high-performance technologies capable of delivering integrated circuits for transmit-receive (T/R) modules and monolithic radar systems. Silicon-Germanium (SiGe) Heterojunction Bipolar Transistor (HBT) technology has been flagged as a strong candidate for such applications because of its high-speed low-noise devices, high integration capabilities, and relatively low cost. This work investigates integration issues associated with monolithic silicon-germanium radar systems for military (8-12 GHz) and automotive (24 GHz) applications. The design and implementation of critical circuits, such as phase shifters, power amplifiers, up-conversion mixers, down-conversion mixers, and voltage-controlled oscillators will be investigated, along with the system level considerations associated with these components. These building blocks have been fabricated and tested at wafer level, utilizing commercially available SiGe HBT BiCMOS technologies, demonstrating acceptable performance for these applications. Preliminary research into substrate coupling associated with these BiCMOS technologies will also be presented, demonstrating the potential for circuit-to-circuit substrate coupling to occur at these microwave frequencies.

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Sobering, Ian David. "Mitigating oscillator pulling due to magnetic coupling in monolithic mixed-signal radio-frequency integrated circuits." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/19755.

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Master of Science
Department of Electrical and Computer Engineering
W. B. Kuhn
An analysis of frequency pulling in a varactor-tuned LC VCO under coupling from an on-chip PA is presented. The large-signal behavior of the VCO's inversion-mode MOS varactors is outlined, and the susceptibility of the VCO to frequency pulling from PA aggressor signals with various modulation schemes is discussed. We show that if the aggressor signal is aperiodic, band-limited, or amplitude-modulated, the varactor-tuned LC VCO will experience frequency pulling due to time-modulation of the varactor capacitance. However, if the aggressor signal has constant-envelope phase modulation, VCO pulling can be eliminated, even in the presence of coupling, through careful choice of VCO frequency and divider ratio. Additional mitigation strategies, including new inductor topologies and system-level architectural choices, are also examined. The analysis is then applied to improve a fully-integrated half-duplex UHF micro- transceiver in which signal coupling between the LO and PA caused frequency pulling that prevented the use of QPSK signaling at certain data rates. We determine that a VCO operating at 4x transmit frequency will be naturally insensitive to pulling from QPSK signals. To validate the proposed solution, a prototype IC containing a pair of QPSK transmitters with integrated 100mW Class-C PAs was designed and fabricated in 0.18um SOI. The transmitters--one utilizing a 2x VCO, one utilizing a 4x VCO-- were designed to closely match the performance of the original microtransceiver when transmitting QPSK data. The transmitter with the 2x VCO experienced frequency pulling from the PA while transmitting QPSK data, but the transmitter with the 4x VCO did not, thereby confirming the analysis in this work. A revision of the microtransceiver was designed in 0.5 [mu]m SOS utilizing an off- chip PA inductor to reduce signal coupling with the VCO. A second revision of the microtransceiver with two prototype transmitters was designed in 0.25 [mu]m SOS uti- lizing 4x VCOs and figure-8 VCO inductors for maximum insensitivity to pulling from QPSK and band-limited modulation, as well as other design improvements that leverage the higher f[subscript]t of the smaller process. Both revisions also include a hardware FSK modulator, a new charge pump, and a redesigned fractional-N synthesizer to attenuate a divided-reference spur in the IF output. These revisions of the radio will enable future researchers to focus on system-level applications where highly-integrated medium-power transceivers with fully-functioning IQ modulation are needed.

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Riedrich-Möller, Janine Simone [Verfasser], and Christoph [Akademischer Betreuer] Becher. "Deterministic coupling of single color centers to monolithic photonic crystal cavities in single crystal diamond / Janine Simone Riedrich-Möller. Betreuer: Christoph Becher." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2014. http://d-nb.info/1064305814/34.

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Ribot, Hervé. "Laser en quart de cercle couplé monolithiquement à un guide optique." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0015.

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L'objet de cette thèse est l'intégration monolithique sur substrat GaAs, d'un laser en quart de cerle et d'un guide optique, couplés par ondes évanescentes
This thesis is devoted to the monolithic integration of a quarter ring laser evanescently coupled to an optical waveguide, on a GaAs substrate

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Espina, Benitez Maria Betzabeth. "Développement et mise en oeuvre de colonnes monolithiques d’affinité boronate pour des techniques séparatives miniaturisées." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1178/document.

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Une partie des recherches actuelles dans le domaine de l’analyse chimique concerne la miniaturisation et l’intégration d’étapes analytiques afin de répondre, entre autres, à des besoins de portabilité, d’automatisation mais aussi d’apporter des solutions pour analyser des échantillons de plus en plus petits. Le développement et la mise en œuvre de colonnes monolithiques d’affinité boronate (µBAMC) couplées « in-line » à des techniques séparatives miniaturisées s’inscrit dans cette démarche. Ce travail de thèse s’est focalisé sur (1) une compréhension des mécanismes de rétention en chromatographie d’affinité boronate (interactions spécifiques avec les composés cis-diols, conditions de reconnaissance, interactions secondaires), (2) le développement de supports monolithiques d’affinité boronate miniaturisés et (3) leur couplage «in-line» avec une séparation électrocinétique et détection conventionnelle dans un format capillaire. Différentes voies d’élaboration de colonnes monolithiques ont été comparées (en termes d’affinité, de nombre de sites boronate actifs et de stabilité). La faisabilité du couplage en ligne de ces supports µBAMC avec une étape de séparation électrophorétique (par CZE et CIEF) a été démontrée vis-à-vis de la purification/préconcentration et séparation de 3 catécholamines contenant des groupements cis-diols (Adrénaline, Noradrénaline et Dopamine) dans l’urine. Les couplages ont été optimisés avec succès permettant l’analyse automatisée et miniaturisée de ces neurotransmetteurs dans l’urine (volume échantillon < 10 µL) avec des limites de détection de l’ordre de la dizaine de ppb et des taux de récupération proches de 100 %
Part of the current research in the field of chemical analysis concerns the miniaturization and the integration of analytical steps in order to meet, among other things, the need of portability and automation but also to provide solutions for analyzing small samples. The development and implementation of monolithic boronate affinity columns (µBAMC) in-line coupled to miniaturized separation techniques is part of this approach. This thesis work focused on (1) an understanding of the retention mechanisms in boronate affinity chromatography (specific interactions with cis-diol compounds, recognition conditions and secondary interactions), (2) the development of miniaturized boronate affinity monolithic supports and (3) their in-line coupling with electrokinetic separation and conventional detection in a capillary format. Different ways of elaboration of monolithic columns were compared (in terms of affinity, number of actives sites and stability). The feasibility of in-line coupling of these µBAMC supports with an electrophoretic separation step (by CZE and CIEF) has been demonstrated in terms of purification / preconcentration and separation of 3 catecholamines containing cis-diol groups (adrenaline, noradrenaline and dopamine) in urine. The couplings have been successfully optimized allowing the automated and miniaturized analysis of these neurotransmitters in urine (sample volume <10 µl) with limits of detection of about the tens of ppb and recovery yields close to 100 %

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Lakhlifi, Mourad. "Conception et évaluation de phases stationnaires chirales pour l'emploi en électrochromatographie capillaire ( Tubes ouverts et colonnes monolithes )." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR098/document.

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Suite à la première thèse sur le greffage et l’adsorption physique successives de sélecteurs chiraux dans des tubes ouverts en électrochromatographie capillaire (ECC ou CEC) chirale, menée par le Dr Guillaume Pédéhontaa-Hiaa au sein de l’équipe du laboratoire COBRA (IUT d’Evreux), nous avons développé des phases stationnaires chirales covalentes (CSPs) à base de cyclodextrines (CDs) en tubes ouverts et des CSPs sur supports monolithiques pour l’emploi en CEC. Nous avons ainsi évalué les paramètres électrochromatographiques et la stabilité de ces CSPs en séparant une variété de racémiques neutres et chargés. L’influence de la température d’analyse, le potentiel appliqué ainsi que la nature et le pH des électrolytes sur la qualité des électrochromatogrammes ont été étudié en CEC chirale. Cette étude se divise en deux grandes parties. La première concerne les CSPs élaborées sur colonnes à tubes ouverts pour l’OT-CEC. Il s’agit initialement de graver la surface interne d’un capillaire de silice de 50 μm de diamètre interne à l’aide d’une solution de bifluorure d’ammonium dans le but premier d’augmenter considérablement sa surface spécifique et d’immobiliser en surface une grande quantité de sélecteurs chiraux à base de β-CD. Nous avons alors décrit des greffages covalents de CDs anioniques (Scc-β-CD et CM-β-CD) et d’un polymère anionique de CDs (p-CM-β-CD-) en surface de capillaire de gel de silice gravée et modifiée chimiquement par l’aminopropyltriéthoxysilane (APTEOS). Les greffages des sélecteurs ont été reproduits dans les mêmes conditions que dans la thèse rapportée précédemment en électrophorèse. L’originalité de la construction de ces CSPs réside dans la rapidité et la simplicité du couplage dit péptidique à température ambiante, des sélecteurs carboxylés sur des colonnes préalablement gravées. Ce greffage nécessite des agents de couplage peptidique solubles dans l’eau tels que 1-Ethyl-3-(diméthylaminopropyl)carbodiimide (EDC) et le N-Hydroxysuccinimide (NHS). Il peut aussi être obtenu de manière moins efficace avec d’autres agents solubles en milieu organique tels que le O-(Benzotriazol-1-yl)-N,N,N’,N’-tétraméthyluronium tétrafluoroborate et la triéthylamine (TBTU/TEA). Chaque étape menant aux CSPs a été caractérisée par une étude de flux électroosmotique (FEO) en OT-CEC. Des analyses en AFM et en MEB nous renseignent d’avantage sur le succès du procédé « etching » de nos capillaires. La deuxième grande partie de cette étude traite de la synthèse in-situ de CSPs sur des colonnes de type polymères monolithes organiques et un monolithe hybride à base de sol gel. Des post modifications de surface de ces supports monolithiques nous ont permis d’immobiliser de façon covalente et non covalente des sélecteurs de β-CD en surface des volumes macroporeux. Deux collaborations ont vu le jour pour atteindre ces objectifs. La première eut lieu avec le Dr Thuy Tran et le Pr Myriam Taverna de la Faculté de Pharmacie de Chatenay Malabry (UMR 8612), durant laquelle nous avons reproduit une colonne monolithe organique de type méthacrylate, porteuse de groupements phosphate dans l’optique d’adsorber physiquement en surface le polymère cationique de CDs (p-CD+) que nous a transféré le Pr Benjamin Carbonnier et d’évaluer les capacités de discrimination chirale de cette nouvelle CSP en m-CEC. La seconde collaboration a eu lieu avec le Dr Mohamed Guerrouache et le Pr Benjamin Carbonnier au sein du laboratoire ICMPE de Thiais, où nous avons synthétisé des colonnes monolithiques organiques à base d’acrylates dans le but de greffer en surface de façon covalente et non covalente les CDs et polymères de CDs et d’évaluer ces nouvelles CSPs en m-CEC. La troisième phase stationnaire monolithique employée est celle décrite par le Dr Huihui Yang qui décrit un monolithe hybride porteur de groupements sulfonates nous permettant par la suite d’immobiliser électrostatiquement le p-CD+ sur le réseau poreux et d’évaluer cette nouvelle CSP en m-CEC
New chiral stationary phases have been prepared for Open Tubular and monolithic columns used in electrochromatography capillary. In order to separate racemic mixtures such as flavonoïd, Hidantoïn derivatives, Binaphtalene-2, 2-hydrogenophosphate and others chiral solutes, we use the β-cyclodextrin forms as chiral selector. Besides, β-cyclodextrin seems to be the most efficient chiral selector in chromatography since it is able to complex and dissolve optical organic isomers in an aqueous media, this chiral selector is able to dissolve even lipophilic molecule with high weight. The complexation is based on interactions with β-cyclodextrin. This study aims to elaborate new chiral stationary phase for CEC using β-cyclodextrin polymers and β-cyclodextrin derivatives. Two approaches were used: Firstly, covalent stationary phases coating with carboxymethyl-β-cyclodextrin polymers and oligomers containing carboxyl’s group had been experimented for open tubular and monolithic column in CEC. Then a non-covalent coating cationic polymer of β-cyclodextrin’s derivatives was immobilized (polytrimethyl ammonium β-CD) on continuous organic monoliths bearing anionic’s group. Prior to the covalent coating of the CD’s chiral selector for OT-CEC and m-CEC, we needed to modify the silicate surface and the monolithic surface with a primary amine silicate1,2 (aminopropyltriethoxysilane) and EDA, an amino-organic moiety (Ethylene diamine). The stability of the bonded organic moiety (APTEOS, EDA) were studied by CEC at different pH with constant ionic strength’s buffer. In this way, graft of carboxymethyl-β-cyclodextrin polymer on silica inner surface modified by APTEOS and on NAS-co-EDMA surface modified by EDA succeeded in activating and covalently coupling reagent as EDC and NHS (1-ethyl-3(-3-dimethtylaminopropyl) carbodiimide and N-hydroxysuccinimide, respectively3) with carboxymethyl’s group of carboxymethyl-β-cyclodextrin . The resultant stationary phase lead to stable chiral stationary phases, easier to prepare starting by coupling the selector to the amine’s group using EDC and NHS. In order to optimize enantio-separations by increasing the specific surface of open tubular columns, we reproduce the etching process to bared capillaries with ammonium bifluoride solution, referred to Pesek’s process4. By this mean, we increase dramatically the specific surface of bared capillaries before anchoring CDs polymers to silicate surfaces modified by APTEOS. Finally due to etching process, we obtain a covalent bonded Chiral Stationary Phase (CSP) which led to more efficient and resolvent enantio-separations by CEC. To describe, in another way, the non-covalent coating of CSP, we immobilised a cationic polymer (polytrimethyl ammonium β-CD+) on two kind of continuous organic and silica hybrid monoliths bearing sulfonate5 and phosphate’s groups. Based on precedent results for OT-CEC enantio-separation with LbL stationary phase7, using successive layers charged polymers to separate racemic mixture in CEC, we decided to adsorb a polycationic polymer hydrosoluble onto the silica hybrid monolith column to form chiral stationary phase (CSP) polytrimethyl ammonium β-cyclodextrin. This way of modification for monolithic surface by chiral selectors is nowadays highly efficient and attractive for CEC. The effect of the matrix and the coating’s nature are discussed by comparing the chromatographic parameters

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Alleau, Thibaut. "Development of a numerical platform to model the mitral valve." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2649.

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L’insuffisance mitrale est la valvulopathie mondiale la plus fréquente avec une prévalence de 2%. Lorsque le patient n’est pas en mesure d’être opéré à cœur ouvert, un implant percutané est utilisé pour aider la fermeture des feuillets. Le seul implant actuellement disponible est basé sur la réparation bord à bord de la valve mitrale. Il réduit le reflux vers l’oreillette lors de la systole, mais n’est pas adapté pour les patients souffrant d’insuffisance mitrale fonctionnelle, chez qui la pathologie provient du ventricule et non des éléments de la valve. L’objectif de la thèse est de fournir une plateforme numérique permettant d’aider au développement d’un implant adapté pour ces patients. Plusieurs géométries de valve ont été réalisées au moyen d’un modèle paramétrique, en utilisant des données anatomiques. La dynamique de la valve a été modélisée avec le logiciel ADINA par des simulations éléments finis en grandes déformations. Des modèles structurels de la valve ont permis de représenter la fermeture de la valve sous une pression uniforme. Les lois de comportement de matériaux ont été développé dans le but d’obtenir une fermeture réaliste de la valve. Cela a nécessité la prise en compte de l’hyperélasticité et de l’anisotropie des tissus. Des pathologies valvulaires, telles que la dilatation de l’anneau mitrale ou la rupture des cordages tendineux ont été modélisées, et plusieurs méthodes ont été testées pour y apposer des systèmes médicaux. En utilisant une description ALE et un couplage monolithique, les interactions fluide-structure ont été simulées pour une valve mitrale bi-dimensionnelle. La fermeture hermétique de la valve pendant la systole a pu être reproduite et l’ouverture de la valve étudiée pendant la diastole. La plateforme numérique développée permet de modéliser la fonction de la valve mitrale et peut être utilisée pour aider au développement d’un implant mitral grâce au modèle paramétrique reproduisant différentes géométries de valve et aux lois matériaux anisotropes. Une perspective reste la création d’un modèle 3D des interactions fluide-structure de la valve mitrale
Mitral insufficiency is the first valvular disease worldwide, with a 2% prevalence. When open-heartsurgery is impossible for the patient, surgeons use percutaneous devices to help the mitral leaflets coapt. However, the only device currently available is based on the edge-to-edge mitral valve repair technique. This type of implant is not adapted for patients suffering from functional mitral insufficiency, where the ventricle is responsible for the lack of coaptation of the leaflets. This thesis aims to provide a numerical platform to help the development of a mitral valve implant adapted for those patients. Several mitral valve geometries were created from a parametric model using anatomical measurements. Finite element simulations of the mitral valve were performed using ADINA to determine the valve closure under constant pressure. Several material models were developed in large strain and large deformation to model the valve closure accurately. Pathological behaviour such as annulus dilatation and chordae rupture were modelled, and several methods were tested to implement medical devices. Fluid-structure interaction of a 2D mitral valve was obtained using an ALE description and a monolithic coupling approach. Both the systole and the diastole were reproduced and studied, and the hermetic seal of the valve was detailed. The numerical platform developed is suited to model mitral valve function and can be used to help the development of mitral implants. In addition, the parametric geometry model and the anisotropic material model will be useful to depict with realism the valve function. A 3D fluid-structure interaction of the mitral valve could be developed

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Wang, Jian-Hao, and 王建皓. "Investigation and Analysis of Random Variations on Hybrid TFET-MOSFET Monolithic 3D SRAMs Considering Interlayer Coupling." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/50885369754140973814.

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碩士
國立交通大學
電子研究所
105
This thesis investigates the impact of interlayer coupling on the stability and performance of monolithic 3D 7T SRAM cell composed of TFETs and MOSFETs operating at ultra-low voltage. We compare the 3D result with 2D counterparts, and compared hybrid case with pure MOSFET case. In addition, we investigate the impact of WFV and LER for monolithic 3D SRAMs considering interlayer coupling. TCAD simulation result indicates that the planar (2D) 7T hybrid TFET-MOSFET SRAM cell exhibits equal leakage, better stability and performance compared with the conventional 2D 8T MOSFET SRAM at ultra-low voltage (VDD ≤ 0.3V). The interlayer coupling, where the front-gate of the bottom tier device alters the back gate bias of the upper tier device, and various stacking and layout arrangements are examined and exploited to improve the stability and performance of monolithic 3D SRAMs. An optimized 3D design is shown to exhibit the best WSNM and cell write performance improvement over the planar design. However, the hybrid case has better improvement than pure MOSFET case. Furthermore, 3D SRAM designs reduce cell area by 40%. The impacts of work function variation (WFV) and line edge roughness (LER) on SRAM cell stability, leakage power and performance are investigated and compared. The results indicate that WFV and LER have different impacts on read disturb and Vwrite,0, which dominate SRAM stability and is determined by the distinct current drive of TFET and MOSFET. The performance is influenced by the different variations of gate capacitance (Cg) under WFV and LER.

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Saito, Yuya. "Analysis and design of monolithic coaxial lines for minimum coupling and integration in various passive devices and networks." Thesis, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3354631.

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Частини книг з теми "Monolithic coupling"

Farhadi Machekposhti, D., N. Tolou, and J. L. Herder. "Monolithic and Statically Balanced Rotational Power Transmission Coupling for Parallel Axes." In Mechanisms and Machine Science, 189–98. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45387-3_17.

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Mateescu, Irina, and Gabriela Pop. "The Influence of the Material Constants and Mass-Loading on Coupling Coefficient of Monolithic Filters." In Piezoelectric Materials: Advances in Science, Technology and Applications, 239–47. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4094-2_24.

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Mnif, Hassene, Dorra Mellouli, and Mourad Loulou. "Optimization of CMOS Quadrature VCO Using a Graphical Method." In Advances in Monolithic Microwave Integrated Circuits for Wireless Systems, 89–103. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-60566-886-4.ch005.

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This chapter describes the design and the optimization of Quadrature Voltage Controlled Oscillators (QVCOs) based on the coupling of two LC-tank VCO. This work covers the phase noise analysis, a graphical optimization approach, already used to optimize LC oscillator phase noise (Andreani, Bonfanti, Romano, & Samori, 2002), to optimize QVCO phase noise while satisfying design constraints such as power dissipation, tank amplitude, tuning range and start up condition. The cross-coupling transistors impact on phase noise for different configurations is especially addressed. The obtained BS-QVCO, using 0.35µm CMOS process, can be tuned between 2.2GHz and 2.58GHz, and shows a phase noise of -129 dBc/Hz at 1MHz offset from a 2.4 GHz carrier, for a current consumption of 9.25mW. The equivalent phase error and amplitude error between I and Q signals are respectively 0.65° and 1.87%.

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Walhorn, E., B. Hübner, A. Kölke, and D. Dinkler. "Fluid-structure coupling within a monolithic model involving free surface flows." In Computational Fluid and Solid Mechanics 2003, 1560–63. Elsevier, 2003. http://dx.doi.org/10.1016/b978-008044046-0.50381-x.

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Cornetta, Gianluca, David J. Santos, and José Manuel Vázquez. "Passive Components for RF-ICs." In Advances in Wireless Technologies and Telecommunication, 189–214. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0083-6.ch008.

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The modern wireless communication industry is demanding transceivers with a high integration level operating in the gigahertz frequency range. This, in turn, has prompted intense research in the area of monolithic passive devices. Modern fabrication processes now provide the capability to integrate onto a silicon substrate inductors and capacitors, enabling a broad range of new applications. Inductors and capacitors are the core elements of many circuits, including low-noise amplifiers, power amplifiers, baluns, mixers, and oscillators, as well as fully-integrated matching networks. While the behavior and the modeling of integrated capacitors are well understood, the design of an integrated inductor is still a challenging task since its magnetic behavior is hard to predict accurately. As the operating frequency approaches the gigahertz range, device nonlinearities, coupling effects, and skin effect dominate, making difficult the design of critical parameters such as the self-resonant frequency, the quality factor, and self and mutual inductances. However, despite the parasitic effects and the low quality-factor, integrated inductors still allow for the implementation of integrated circuits with improved performances under low supply voltage. In this chapter, the authors review the technology behind monolithic capacitors and inductors on silicon substrate for high-frequency applications, with major emphasis on physical implementation and modeling.

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Baliyan, Niyati, and Ankita Verma. "Recent Advances in the Evaluation of Ontology Quality." In Semantic Web Science and Real-World Applications, 326–48. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7186-5.ch013.

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Ontology or domain specific vocabulary is indispensable to a semantic web-based application; therefore, its evaluation assumes critical importance for maintaining the quality. A modular ontology is intuitively preferred to as a monolithic ontology. A good quality modular ontology, in turn, promotes reusability. This chapter is directed at summarizing the efforts towards ontology evaluation, besides defining the process of evaluation, various approaches to evaluation and underlying motivation. In particular, a modular ontology's cohesion and coupling metrics have been discussed in detail as a case study. The authors believe that the body of knowledge in this chapter will serve as a beginning point for ontology quality engineers and at the same time acquaint them with the state-of-art in this field.

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Huang, Chongwei, Yan Xie, Yunzhen Wei, and Kun Wang. "Analysis of influencing factors on central load and temperature coupling effect of tram monolithic roadbed." In Progress in Civil, Architectural and Hydraulic Engineering IV, 569–75. CRC Press, 2015. http://dx.doi.org/10.1201/b19383-116.

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Ciampi, Mario, Antonio Coronato, Giuseppe De Pietro, and Luigi Gallo. "Architectural Models for Reliable Multi-User Interfaces." In User Interface Design for Virtual Environments, 76–91. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-61350-516-8.ch005.

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Virtual Environments are complex systems in that they involve the crucial concept of sharing. Users can share knowledge of each other’s current activities, environments, and actions. In this chapter, the authors discuss about interaction interoperability, intended to mean the ability of two or more users to cooperate despite the heterogeneity of their interfaces. To allow such interoperability, formal methods to formalize the knowledge and middleware solutions for sharing that knowledge are required. After introducing the state-of-the-art solutions and the open issues in the field, the authors describe a system for providing interaction interoperability among multi-user interfaces. Rather than focusing on the de-coupling of input devices from interaction techniques and from interaction tasks, this chapter suggests integrating interactive systems at higher level through an interface standardization. To achieve this aim, the authors propose: i) an architectural model able to handle differences in input devices and interaction tasks; ii) an agent-based middleware that provides basic components to integrate heterogeneous user interfaces. The chapter also presents a case study in which an agent-based middleware is used to support developers in the interconnection of monolithic applications.

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Štěpánek, Jan, Petr Kočí, Milan Kubíček, František Plát, and Miloš Marek. "Spatially 3D simulation of a catalytic monolith by coupling of 1D channel model with CFD." In Computer Aided Chemical Engineering, 141–45. Elsevier, 2011. http://dx.doi.org/10.1016/b978-0-444-53711-9.50029-8.

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Тези доповідей конференцій з теми "Monolithic coupling"

Frye, Robert C., Phoo Hlaing, and Kai Liu. "High CMRR in reduced-coupling monolithic baluns." In 2010 IEEE/MTT-S International Microwave Symposium - MTT 2010. IEEE, 2010. http://dx.doi.org/10.1109/mwsym.2010.5517605.

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Frye, R. C., K. Liu, and P. Hlaing. "High CMRR in reduced-coupling monolithic baluns." In 2010 IEEE/MTT-S International Microwave Symposium - MTT 2010. IEEE, 2010. http://dx.doi.org/10.1109/mwsym.2010.5515532.

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Palen, Edward. "Optical coupling to monolithic integrated photonic circuits." In Integrated Optoelectronic Devices 2007, edited by Allen M. Earman and Ray T. Chen. SPIE, 2007. http://dx.doi.org/10.1117/12.699782.

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Hattori, J., K. Fukuda, T. Irisawa, H. Ota, and T. Maeda. "Interlayer Coupling of Stacked MOSFETs in Monolithic 3D Inverters." In 2016 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2016. http://dx.doi.org/10.7567/ssdm.2016.k-1-04l.

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Gilles, C., G. Maisons, B. Simozrag, and M. Carras. "Monolithic coupling of QCLs in evenescent waveguides on InP." In SPIE OPTO, edited by Manijeh Razeghi, Eric Tournié, and Gail J. Brown. SPIE, 2015. http://dx.doi.org/10.1117/12.2176531.

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Benz, A., S. Campione, S. Liu, I. Montano, J. F. Klem, M. B. Sinclair, F. Capolino, and I. Brener. "Strong Light-Matter Coupling in Mid-Infrared Monolithic Metamaterial Nanocavities." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/cleo_qels.2014.ftu3c.7.

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Debnath, Kapil, Karl Welna, Marcello Ferrera, Kieran Deasy, David Lidzey, and Liam O'Faolain. "Highly efficient coupling between a nanocavity and monolithic bus waveguide." In 2012 IEEE 9th International Conference on Group IV Photonics (GFP). IEEE, 2012. http://dx.doi.org/10.1109/group4.2012.6324100.

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Koster, Tom M., V. E. Houtsma, Paul V. Lambeck, Dion J. Klunder, Th J. A. Popma, and J. Holleman. "Mode-selective coupling structures for monolithic integrated waveguide-detector systems." In Optoelectronics '99 - Integrated Optoelectronic Devices, edited by Derek C. Houghton and Eugene A. Fitzgerald. SPIE, 1999. http://dx.doi.org/10.1117/12.342788.

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Patil, Chandraman, Hamed Dalir, Hao Wang, and Volker Sorger. "1fJ/bit Coupling-based ITO Monolithic Modulator in Integrated Photonics." In 2021 26th Microoptics Conference (MOC). IEEE, 2021. http://dx.doi.org/10.23919/moc52031.2021.9598008.

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Nadig, Sachin, Serhan Ardanuc, and Amit Lal. "Monolithic piezoelectric in-plane motion stage with low cross-axis-coupling." In 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2014. http://dx.doi.org/10.1109/memsys.2014.6765693.

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