Thematische Bibliographien / Mixed multilayer

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Auswahl der wissenschaftlichen Literatur zum Thema „Mixed multilayer“

Autor: Grafiati

Veröffentlicht am 27. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Mixed multilayer"

Jinlong Zhang, Jinlong Zhang, Zhanshan Wang Zhanshan Wang und Xinbin Cheng Xinbin Cheng. „Dispersive mirrors designed with mixed metal multilayer dielectric stacks“. Chinese Optics Letters 10, Nr. 1 (2012): 013101–13103. http://dx.doi.org/10.3788/col201210.013101.

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Fernandes, Amâncio. „A mixed formulation for elastic multilayer plates“. Comptes Rendus Mécanique 331, Nr. 5 (Mai 2003): 337–42. http://dx.doi.org/10.1016/s1631-0721(03)00085-8.

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Grabowski, K., A. Patrykiejew und S. Sokołowski. „Monte-Carlo simulation of mixed multilayer adsorption“. Thin Solid Films 304, Nr. 1-2 (Juli 1997): 344–52. http://dx.doi.org/10.1016/s0040-6090(97)00214-9.

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Swain, Akshaya Kumar, und Dhirendra Bahadur. „Deconvolution of mixed magnetism in multilayer graphene“. Applied Physics Letters 104, Nr. 24 (16.06.2014): 242413. http://dx.doi.org/10.1063/1.4884426.

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Cho, Beom Geun, Dong Gun Kam und Hyung Il Koo. „Mixed-Signal Escape Routing Algorithm for Multilayer PCBs“. IEEE Transactions on Components, Packaging and Manufacturing Technology 9, Nr. 8 (August 2019): 1576–86. http://dx.doi.org/10.1109/tcpmt.2019.2900463.

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Pan Liang, M. Moghaddam, L. E. Pierce und R. M. Lucas. „Radar backscattering model for multilayer mixed-species forests“. IEEE Transactions on Geoscience and Remote Sensing 43, Nr. 11 (November 2005): 2612–26. http://dx.doi.org/10.1109/tgrs.2005.847909.

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Vyas, A., Yao Gen Shen, Zhi Feng Zhou und K. Y. Li. „Nano-Structured CrN/CN_x Multilayer Films“. Key Engineering Materials 334-335 (März 2007): 893–96. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.893.

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CrN/CNx nano-scale multilayered films were deposited on Si (100) substrate by closed-field unbalanced magnetron sputtering. Designed experimental parameters enabled an evaluation of the effects of negative substrate bias voltage (Vb), and bi-layer thickness λ (by changing substrate rotation rate) during deposition on the structural and mechanical properties of multilayer films. These multilayers were characterized and analyzed by transmission electron microscope (TEM), X-ray diffraction (XRD), atomic force microscopy (AFM), and nanoindentation measurements. In all cases, the CNx layers were amorphous and independent of Vb, while the microstructures of the CrN layers were dependent primarily on Vb. The CrN layers showed a mixed structure phase consisting of CrN, Cr2N, and Cr at Vb = -(40-120) V. At higher Vb values (-140 V or above), the Cr2N phase was dominant along with low CrN phase content. AFM measurements revealed that the root-mean-square (rms) surface roughness of the CrN/CNx film was 2 nm at Vb= -200 V whereas the rms values were about 9.5-3.3 nm for lower Vb values of -(40-180 V). By nanoindentation measurements, a maximum hardness of about 36 GPa was observed at Vb= -140 V. The improved mechanical properties of the films are correlated to the phase formation during deposition.

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Wang, Lan Yi, Cheng Xiang Lu und Guo Yi Tang. „Fabrication of High Performance Multilayer ZnO Varistors with Chemically Synthesized Doped Zinc Oxide Powder“. Key Engineering Materials 336-338 (April 2007): 739–42. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.739.

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Two types of multilayer ZnO varistors are prepared by the chemically synthesized (CS) powder and the mixed oxide (MO) powder. The ceramic microstructure analysis shows that the multilayer variestor (MLV) ceramic prepared by the CS powder has the fine grain, the homogeneous distribution of grain size and the uniform dopant distribution. The CS powder prepared multilayer ZnO varistors display better electrical properties, including higher nonlinear coefficient, higher breakdown voltage, higher peak current, lower leakage current and lower clamping voltage, than those made by the mixed oxide powder. All these superior electrical properties are attributed to the CS powder, which makes more uniform dopant distribution throughout the multilayer ZnO varistors. The homogeneous distribution for the various dopants in the varistor ceramic has been achieved by the chemically synthesized doped ZnO powder. Therefore, the chemically synthesized powder can be used in the manufacture of high performance multilayer ZnO varistors.

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Qi, Yu Hong, Zhan Ping Zhang, Jing Zhao Wang und Ya Meng Chen. „Superhydrophobic Coatings Prepared by Micro/nano Particles Mixed with Fluorocarbon Resin“. Materials Science Forum 687 (Juni 2011): 552–56. http://dx.doi.org/10.4028/www.scientific.net/msf.687.552.

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In this paper, single and multilayer superhydrophobic composite coatings, based on fluorocarbon resin and micro-tourmaline and nano-TiO2powers, were prepared by conventional air spray method. The tourmaline and TiO2particles were modified by fluoroalkylsilane. The wettability and marine corrosion of the coatings surfaces were investigated respectively by contact angle measurement and Electrochemical Impedance Spectroscopy (EIS) method, and their morphology was examined by Scanning Electron Microscopy (SEM). The results showed that the water contact angle of coatings was mainly controlled by the mass ratio of the fluorocarbon resin and particles. The contact angle increased with the increase of particle concentration, which reached about 156° when the mass ratio of the particles and fluorocarbon resin was 2:1 for single and multilayer composite coatings, but the impedance valve of the multilayer is higher than that of the single layer.

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Bae, Jin Hye, Jin Han Cho und Kook Heon Char. „Fabrication of Antireflective Films Composed of High and Low Refractive Index Layers Using Layer-by-Layer Self-Assembly Method“. Solid State Phenomena 124-126 (Juni 2007): 559–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.559.

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We introduce a novel and versatile approach for controlling anti-reflective (AR) properties of multilayer films based on layer-by-layer (LbL) self-assembly (SA) method. For the fabrication of these films, blend (i.e., mixed) layers containing both polyanions (i.e., titanium precursor (TALH) and poly(sodium 4-styrenesulfonate) (PSS)) were assembled with polycation (i.e., poly(diallyldimethylammonium chloride) (PDAD)) for the formation of the high refractive index multilayers and on the other hand, the negatively charged silica particles with the diameter of about 100 nm were employed for low refractive index layer. The refractive index of TALH:PSS/PDAD multilayer was controlled by blending ratio and annealing temperature as TALH has the relatively high refractive index (n = 1.68) in comparison with that (n = 1.46) of conventional polyelectrolytes (PEs) at room temperature and furthermore these titanium precursors are partially changed into TiO2 with relatively high refractive indices (n = 1.50 ~ 1.81) at annealing temperature of 250 oC. In the case of silica particle layer used for low refractive index layer, the calculated refractive index was about 1.35 due to much vacancy among the adsorbed silica colloids although the inherent refractive index of silica material is about 1.45. As a result, the films composed of TALH:PSS/PDAD multilayers with tunable refractive index and silica colloidal layer can easily modulate the optical properties of multilayer films by blending ratio and heat treatment.

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Dissertationen zum Thema "Mixed multilayer"

Cummings, Linda. „Monolayer and multilayer & mixed OH/water on Pd(111)“. Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/9533/.

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An extensive amount of literature can be found containing experimental and theoretical studies of water adsorption on metal surfaces, yet an understanding of the water – metal interface remains far from complete. The binding energy of the water – metal interface determines whether water wets a metal surface to form a complete hydrogen bonded network, forms 3-dimensional ice clusters on a non-wetting surface or dissociates to form hydroxyl, hydrogen and sometimes oxygen on the surface. All of these structures are seen depending on the growth conditions and reactivity of the metal surface. In this thesis it is shown that submonolayer water adsorbs intact on Pd(111) to form a structure with (√3×√3)R30° periodicity. As the first layer saturates the spots in the √3 position split due to the formation of dense domain boundaries. Although the first layer of water covers the Pd surface, subsequent layer-by-layer growth does not occur. Instead, an extended superstructure forms by attaching 3D clusters of ice and areas of bare monolayer remain exposed. The formation of an ordered oxygen network results in detection of an intense LEED pattern, even at a coverage of 80 layers. As the first layer of water compresses, it stabilises the growth of the larger superstructure. Further investigation shows the hydrogen network formed during multilayer growth is weakly bonded and helium atom scattering shows that there is disorder on a local scale. Co-adsorption of oxygen alters the structure and stability of water overlayers and on Pd(111) a stable mixed (OH + H2O) layer forms with (√3×√3)R30° periodicity but is unreactive towards hydrogen, therefore the low temperature reaction between hydrogen and oxygen cannot be catalysed.

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Azizi, Abdelaaziz. „GOLD CYANIDATION REVISITED – KINETIC & ELECTROCHEMICAL STUDIES OF GOLD – SULFIDIC ORE MIXED/MULTILAYER FIXED BEDS“. Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28270/28270.pdf.

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Pour déchiffrer le rôle de minerais sulfureux sur la cyanuration de l’or, une étude détaillée sur l’importance relative des phénomènes de passivation (PP) et d’interactions galvaniques (IG) a été menée dans le présent travail de thèse. Une électrode tournante à disque (RDE) Au/Ag plongée successivement dans une série de pulpes préparées à partir d’une large gamme de sulfures métalliques a révélé l’impact négatif de ces derniers sur la lixiviation de l’or. Puisque les contacts galvaniques permanents entre électrode tournante à disque d’or (RDE) et suspensions de minerais sulfureux sont difficiles à mettre en œuvre, les tests standards de cyanuration réalisés en mode RDE/slurry ont plutôt tendance à surestimer l’importance des PP sur l’effet aidant des IG, intrinsèquement présents dans les particules minérales. Ainsi, un nouveau réacteur électrochimique à lit fixe (PBER) a été développé et testé pour découpler et quantifier les contributions individuelles des PP et d’IG sur la lixiviation de métaux précieux (or et argent, PM) lors de la cyanuration de minerais riches en sulfures. Le réacteur a été chargé de mélanges homogénéisés, de sulfures et de poudres d’or et d’argent, où y sont établis les contacts galvaniques permanents à l’échelle inter-particulaire entre tous les constituants. Les IG améliorent, à des degrés variables, la lixiviation des métaux précieux, particulièrement celles dues à la pyrite, à la chalcopyrite et à un minerai industriel ont été tellement positives qu’elles l’emportent largement sur les effets négatifs dus aux PP. L’extension de la nouvelle approche du PBER pour prendre en considération les caractéristiques minéralogiques de plusieurs systèmes multi-minéraux a montré que les IG Au- sulfures ont été le paramètre le plus important contrôlant la lixiviation de l’or. Finalement, plusieurs stratégies ont été testées pour améliorer la cinétique de cyanuration de l’or en présence de sulfures inhibiteurs. La galène neutralise largement l’effet négatif de la dissolution des minéraux sulfureux sur la lixiviation de l’or. Des tests de pré-oxydation menés sur des sulfures individuels puis sur leurs mélanges associés ont montré que les IG sulfure-sulfure se produisant lors de l’étape de pré-oxydation au sien du mélange peuvent donner lieu à des résultats totalement différents pendant la cyanuration.
To elucidate the role of sulfide ores on gold cyanidation, a detailed study on the relative importance of passivation phenomena (PP) and galvanic interactions (GI) was carried out in the present thesis work. A Rotating Disc Electrode (RDE) Au/Ag disc immersed successively in slurries of a wide range of sulfide rich ores emphasized the negative impact of sulfide minerals on the gold leaching rate. Because permanent GI between gold RDE and slurried sulfide-rich ores are uneasy to achieve, the standard gold RDE/slurry cyanidation arrangement has a tendency to inflate overly the importance of PP over the corrective trend of GI inherently present within the ore grains. A new packed-bed electrochemical reactor (PBER) was thus developed and tested to decouple and quantify the individual contributions of PP and GI on precious metal (gold and silver, PM) leaching rates during cyanidation of sulfidic ores. The PBER was filled with mixtures of sulfide minerals, gold and silver powders, where permanent (inter)particle-particle electrical contacts were ensured among all constituents. GI were found to ameliorate, to various degrees, the leaching of PM, particularly those due to pyrite, chalcopyrite and an industrial ore were so positive that they largely outweighed the negative impact of PM passivation. Extending the new PBER approach to consider the mineralogical characteristics of several multi-mineral systems indicated that GI between gold and sulfide mineral particles were the most important parameters affecting gold leaching. Several leveraging strategies were tested to increase gold cyanidation kinetics in the presence of PM-leaching inhibiting sulfide minerals. Galena was found to largely neutralize the negative effect of sulfide minerals dissolution on gold leaching. Pre-oxidation tested on individual sulfide minerals and on their associated mixtures revealed that GI occurring between conducting phases present in the ore may give rise to totally different cyanidation responses.

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Chakraborty, Pinaki. „Tool Life and Flank Wear Modeling of Physical Vapour Deposited TiAlN/TiN Multilayer Coated Carbide End Mill Inserts when Machining 4340 Steel Under Dry and Semi-Dry Cutting Conditions“. Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/22.

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This study investigates the tool wear of advanced PVD TiALN/TiN multilayer coated end mill inserts when dry and semi-dry machining 4340 low alloy medium carbon steel. A factorial design of experiment setup consisting of two levels of speed, three levels of feed, two levels of depth of cut, and two levels of cutting conditions (semi-dry and dry) was used for the study. The combination of cutting conditions that gave the best response for different components of cutting force, cutting power, surface roughness and tool life were determined using MANOVA & ANOVA analysis and Tukey comparison of means test using MINITAB statistical software package. From a study of the Energy Dispersive X ray (EDX) analysis and primary back scatter images obtained from the worn out crater surface of the insert, it was observed that diffusion wear prevailed under both dry and semi-dry machining conditions. A tool life model was developed using multiple regression analysis within the range of cutting conditions selected. A model for flank wear progression was also developed using mixed effects modeling technique using S Plus statistical software package. This technique takes into account between and within work piece variations during end milling and produces a very accurate model for tool wear progression. This is the first time application of the mixed effects modeling technique in metal cutting literature.

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Nasser, Hanan. „Méthode de résolution du M4-5n par éléments finis mixtes pour l’analyse des chaussées avec discontinuités“. Thesis, Ecole centrale de Nantes, 2016. http://www.theses.fr/2016ECDN0005/document.

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Les chaussées subissent des sollicitations liées au trafic et au climat conduisant à leur dégradation, par fissuration notamment. Il est nécessaire dans le contexte actuel de pouvoir modéliser le comportement de ces structures multicouches endommagées afin de prévoir leur durée de vie résiduelle ou dimensionner des solutions de renforcement. L’objectif de la thèse est ainsi de proposer un outil de calcul dédié à l'analyse 3D des chaussées fissurées ou comportant des discontinuités. L’approche retenue repose sur la modélisation simplifiée d’une chaussée par un empilement de plaques du Modèle Multi-particulaire des Matériaux Multicouches à 5n équations d’équilibre (M4-5n). Un outil de calcul rapide de référence de chaussées 2D fissurées et une méthode de résolution générale du M4-5n par Eléments Finis mixtes sont développés. Le point de départ de la méthode de résolution est l’écriture, pour le M4-5n, du principe variationnel basé sur le théorème de l'énergie complémentaire où la condition de contraintes statiquement admissibles est assurée à partir de multiplicateurs de Lagrange. La discrétisation des efforts généralisés utilise des espaces d’interpolation permettant le bon conditionnement du système d’équations algébriques à résoudre et garantissant la stabilité de la solution. La méthode est implémentée dans FreeFem++. Elle ramène le problème 3D initial à une modélisation EF 2D et conduit à des valeurs finies des efforts généralisés au niveau des fissures ou décollement d’interface. L’outil de calcul final ainsi développé est validé et appliqué à l’étude de la réponse d’une structure fissurée,représentative d’une chaussée testée en vraie grandeur sur le site de l’IFSTTAR
Pavements are multilayer structures which undergo cracking distress due to traffic and climatic factors. It is important nowadays to be able to model the mechanical response of such damaged pavements in order to assess their residual lifetime or to design reinforcement solutions. In this context, the present thesis aims at developing a numerical tool dedicated to the analysis of pavements incorporating cracks or discontinuities. In the developed approach, the pavement structure is modeled as a stacking of “plate” elements of typeM4-5n (Multi-Particle Models of Multilayer Materials) which considers 5n equilibrium equations. A reference quick 2D calculation tool for cracked pavements and a general solving of M4-5n by the mixed Finite Element (FE) method was developed. The starting point for this method is the derivation for M4-5n of the variational principle based on the complementary energy theorem whose condition of statically admissible stress is taken into account using Lagrange multipliers. Discretization of the generalized stresses involves interpolation spaces, proposed to avoid ill-conditioned system of algebraic equations after discretization and to insure stability of the solution. The developed method is implemented in a FreeFem++ script. In this method, the initial 3D problem can be handled through FE simulations in 2D and finite values of the generalized stresses are obtained at crack and interlayer debonding locations. The developed numerical tool was validated and applied to the study of the mechanical response of a structure with cracks representative of a pavement tested underfull-scale conditions during an accelerated fatigue test performed at IFSTTAR

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Purohit, Nipa S. „Non-covalent Assembly of Reversible Photoswitchable Surfaces“. Digital WPI, 2005. https://digitalcommons.wpi.edu/etd-theses/878.

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"Previous studies carried out in our laboratory resulted in the development of noncovalently assembled multilayered thin films incorporating metal ions such as Cu(II) and organic ligands including dicarboxypyridine. In one study, a SAM consisting of 4-[(10- mercaptodecyl)oxy]pyridine-2,6-dicarboxylic acid was deposited on gold. The pyridine group was then used to complex a layer of Cu(II) ions which in turn were capped by cis- 2,2â€™-dipyridylethylene. This stilbene analog undergoes photoinduced cis-trans isomerization on the surface resulting in a substantial increase in the hydrophilicity of the surface leading to the possibility of creating virtual microfluidic valves and pumps. However, the photoswitchable wettability was irreversible. Stilbene-4,4-dicarboxylic acid was the ligand selected for generating a reversible system. The decision to use this stilbene moiety was based on molecular modeling and the commercial availability of both cis and trans forms. When 4-[(10-mercaptodecyl)oxy]pyridine-2,6-dicarboxylic acid was used as SAM, the stilbene-4,4â€™-dicarboxylic acid did not undergo photoisomerization. Prolonged irradiation leads to photodegradation of film. A mixed SAM of dodecanethiol and mercaptoundecanoic acid was used to create space on the surface and facilitate isomerization. But cis-trans isomerization of the stilbene moiety was not achieved by this system. When a mixed SAM of 4-[(10-mercaptodecyl)oxy]pyridine-2,6-dicarboxylic acid and 4-tert butylbenzenethiol was used, stilbene-4,4-dicarboxylic acid showed reversible photoinduced cis-trans isomerization for one complete cycle leading to a reversible change in wettability. After one cycle of isomerization the film photodegrades."

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Brischetto, Salvatore. „Classical and mixed multilayered plate/shell models for multifield problems analysis“. Paris 10, 2009. http://www.theses.fr/2009PA100198.

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Des approches analytiques et numériques ont été développées et implémentées dans ce travail afin d’étudier les structures multicouches sous sollicitations multi physiques. Le document est organisé en trois principales parties : une extension des relations géométriques et des lois de comportement aux problèmes multi physiques et aux plaques et coques multicouches; l’introduction de la CUF, des principes variationnels, et leur extension aux problèmes multi physiques; des résultats pour différents problèmes multi physiques couples. Les lois de comportement pour les problèmes multi physiques sont présentées dans la première partie et étendues aux matériaux à gradient fonctionnel en utilisant des fonctions adaptées pour décrire les variations dans l’épaisseur. Ces lois sont obtenues en utilisant les lois de la thermodynamique, sont ensuite étudiées pour différents couplages et réécrites dans le cas particulier des approches mixtes. Les relations géométriques des plaques et coques sont aussi discutées dans le cas des problèmes multi physiques. La seconde partie est dédiée à la CUF, en utilisant une présentation générale et unifiée permettano de décrire les variables mécaniques, thermiques et électriques pour les plaques et les coques. Les modèles proposés sont raffinés ou avancés, en fonction de la formulation variationnelle : raffinés dans le cas du principe des puissances virtuelles (PVD, en anglais), avancés si on utilise le théorème variationnel mixte de Reissner (RMVT, en anglais). La troisième partie concerne les résultats dans le cas d'analyse mécanique, thermo-mécanique et électro-mécanique
Analytical and numerical models have been implemented in this work to study multifield problems for multilayered structures. The dissertation is organized in three main parts: an extension of the geometrical relations and constitutive equations to multifield problems and multilayered plates and shells; the introduction of Carrera’s Unified Formulation (CUF), the use of variational statements, and their extension to multifield problems; the results of several multifield couplings. Constitutive equations for multifield problems are given in the first part and they are extended to functionally graded materials by employing opportune thickness functions to describe the physical properties that continuously change in the thickness direction. The multifield constitutive equations, obtained in a generalized way by employing thermodynamic considerations, are discussed for several multifield couplings and rewritten opportunely for the case of mixed models. Geometrical relations for plates and shells are discussed, with particular attention to their extension to multifield problems. The second part is devoted to CUF, with the introduction of a general and unified manner of describing the variables related to mechanical, thermal and electrical fields in multilayered plates and shells. The proposed two-dimensional models are defined as refined or advanced, according to the considered variational statement: refined models are based on the principle of virtual displacements (PVD), advanced models employ Reissner's mixed variational theorem (RMVT). The third part is about the results of the pure mechanical analysis, the thermo-mechanical analysis and the electro-mechanical coupling

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Laschewsky, André, W. Paulus, Helmut Ringsdorf, A. Schuster, G. Frick und A. Mathy. „Mixed polymeric monolayers and Langmuir-Blodgett multilayers with functional low molecular weight guest compounds“. Universität Potsdam, 1992. http://opus.kobv.de/ubp/volltexte/2008/1723/.

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Mixed monolayers and Langmuir-Blodgett multilayers of functional low molecular weight guest compounds, especially nonlinear optical (NLO) dyes, within the matrix of an amphotropic spacer polymer have been prepared. The polymer matrix enabled the transfer of guest compounds not capable of self-organizing at the air-water interface by themselves. The structure of the LB multilayers and the transfer process were studied by small angle X-ray scattering and UV-visible spectroscopy. Good NLO coefficients were found in the mixed films.

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Lesieur, Pierre. „Etude de l'orientation moléculaire dans les films de Langmuir-Blodgett“. Paris 6, 1986. http://www.theses.fr/1986PA066290.

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Ce travail constitue une caractérisation des films de Langmuir-Blodgett par résonance paramagnétique électrique et par diffusion Raman résonante en lumière polarisée. Les films sont constitués de multicouches, mixtes ou alternées, de porphyrines amphiphiles et d'acide docosanoïque. Le sujet porte sur l'orientation des macrocycles porphyriniques par rapport au substrat supportant les couches

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Stephan, Pascal. „Contribution a la realisation de composants optoelectroniques integres sur inp“. Paris 6, 1987. http://www.theses.fr/1987PA066215.

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Cette these traite particulierement sur la realisation de guide de structure a ruban inverse sur substrat inp en utilisant deux techniques de croissance anisotrope: l'epitaxie en phase liquide (lpe) et l'epitaxie en phase vapeur (vpe). Cette approche permet de resoudre plus facilement les problemes technologiques et d'integration des composants actifs

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Do, Minh-Nhut. „Co-conception et caractérisation de circuits actifs et passifs tri-dimensionnels en bande K pour l'intégration de mycrosystèmes sur silicium aux fréquences milimétriques“. Phd thesis, Université Paul Sabatier - Toulouse III, 2007. http://tel.archives-ouvertes.fr/tel-00196619.

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Les travaux menés dans le cadre de cette thèse proposent de tirer profit des nouvelles technologies disponibles pour répondre aux besoins de la montée en fréquence et de la miniaturisation des systèmes de communication tout en améliorant le niveau des performances. Les études se sont axées vers la conception d'une structure à mélangeur de réjection de fréquence image permettant de relâcher les contraintes sur les structures critiques de filtrage amont. L'intégration des parties actives et passives de ce système, a ainsi été menée avec comme objectifs de tirer au maximum partie des potentialités de chaque technologie, de proposer des solutions techniques pour palier aux inconvénients de chaque technologie, et d'optimiser l'architecture globale en partitionnant le système suivant les contraintes technologiques et/ou techniques. La première partie des travaux a ainsi porté sur le développement en bande K d'une nouvelle topologie de mélangeur à base de transistors à hétérojonction Si-SiGe à linéarité améliorée. Se basant sur une compréhension des phénomènes intrinsèques du circuit, des topologies modifiées ont de plus été proposés afin de repousser l'ensemble des performances atteignables sur cette technologie. La seconde partie des travaux concerne la conception de coupleurs passifs, toujours en bande K, avec pour objectif la miniaturisation maximale de ces fonctions. Une méthodologie de conception a, dans ce cadre, été développée et validée par une intégration sur une technologie spécifiquement développée au LAAS-CNRS et compatible avec une future intégration avec les circuits actifs. Nous avons ainsi obtenu des performances optimales (à l'état de l'art) avec un gain d'intégration d'un facteur 2. Enfin, en amont et en aval de ces travaux, une étude sur l'architecture globale du système de mélangeur à réjection de fréquence image a été conduite, et sans cesse raffinée, afin de partitionner les contraintes de performances entre les différents blocs et de vérifier l'obte ntion des performances.

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Buchteile zum Thema "Mixed multilayer"

Czekaj, Dionizy, Julian Dudek, Zygmunt Surowiak, Aleksandr V. Gorish, Yuri N. Koptev, Aleksandr A. Kuprienko und Anatoli E. Panich. „Multilayer Piezoelectric Sensors on the Basis of The PZT Type Ceramics“. In Mixed Design of Integrated Circuits and Systems, 91–96. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5651-0_14.

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Cheung, J., R. B. Rosner, M. F. Rubner, X. Q. Yang, J. Chen und T. A. Skotheim. „Molecular Organization and Electrical Properties of Mixed Langmuir-Blodgett Multilayer Thin Films of Polypyrrole“. In Conjugated Polymeric Materials: Opportunities in Electronics, Optoelectronics, and Molecular Electronics, 91–99. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2041-5_6.

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da Fonseca, Jose B. „A Novel Algorithm to Train Multilayer Hardlimit Neural Networks Based on a Mixed Integer Linear Program Model“. In Advances in Computational Intelligence, 477–87. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19222-2_40.

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Guo, Hongchen, und Daqing He. „A Mixed Active Learning Model for Multilabel Classification“. In Advances in Intelligent Systems and Computing, 741–48. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0238-5_78.

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Chazalet-Saint-Pierre, M., und M. Dupeyrat. „The Structure of Monolayers and Multilayers of Cyanine Dyes Mixed with Stearic Acid“. In Surfactants in Solution, 1015–26. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-7981-6_38.

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Nojima, Tsutomu, Masayuki Kinoshita, Yoshinori Kuwasawa und Shigeru Nakano. „Anisotropy of Critical Current and 2D Mixed State in Superconducting Nb/NbZr Multilayers“. In Advances in Superconductivity V, 497–500. Tokyo: Springer Japan, 1993. http://dx.doi.org/10.1007/978-4-431-68305-6_111.

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„Evolution Strategies for Mixed-Integer Optimization of Optical Multilayer Systems“. In Evolutionary Programming IV. The MIT Press, 1995. http://dx.doi.org/10.7551/mitpress/2887.003.0009.

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Balachandran, Manoj. „Extraction of Preformed Mixed Phase Graphene Sheets from Graphitized Coal by Fungal Leaching“. In Handbook of Research on Inventive Bioremediation Techniques, 287–99. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2325-3.ch012.

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The potential use of coal as source of carbon nano structure is seldom investigated. Herein we report a facile fungal solubilization method to extract mixed phase carbon structure from low grade coal. Coal had been used as a primary source for the production of carbon nanostructure with novel property, in addition to its main utility as a fuel. The major hurdle in its application is the inherent mineral embedded in it. An environmentally benign demineralization procedure make coal as a widely accepted precursor for the novel carbon materials. With Aspergiilus niger leaching, the randomly oriented preformed crystalline mixed phase nanocarbon in coal can be extracted. Raman studies revealed the presence of E2g scattering mode of graphite. The sp3 domains at ~1355 cm-1 (D band) is an indication of diamond like structure with disorder or defect. In the 2D region, multilayer stacking of graphene layers is noticed. The ratio of the defect to graphitic bands was found to be decreasing with increasing rank of coal. Bio leaching of coal enhances the carbon content in coal while eliminating the associated minerals in it. These defected carbon is an ideal material for graphene quantum dots and carbon dots, which are useful in drug delivery and bio imaging applications.

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Konferenzberichte zum Thema "Mixed multilayer"

Zhuo Cheng, Jun Wang, Haiyang Hu, Xing Ma, Haoyuan Ma, Yongqing Huang und Xiaomin Ren. „Design of mixed HCG/DBR multilayer reflectors“. In 2016 15th International Conference on Optical Communications and Networks (ICOCN). IEEE, 2016. http://dx.doi.org/10.1109/icocn.2016.7875860.

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Kucharzak, Michal, und Krzysztof Walkowiak. „A mixed integer formulation for multicast flow assignment in multilayer networks“. In 2010 Fifth International Conference on Broadband and Biomedical Communications (IB2Com). IEEE, 2010. http://dx.doi.org/10.1109/ib2com.2010.5723619.

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Yindar Chuo und Bozena Kaminska. „Design for modular testing of a multilayer flexible wireless multisensor platform“. In 2009 IEEE 15th International Mixed-Signals, Sensors, and Systems Test Workshop (IMS3TW). IEEE, 2009. http://dx.doi.org/10.1109/ims3tw.2009.5158698.

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Camou, S., S. Ballandras und T. Pastureaud. „A mixed FEM/BEM model to characterize surface waves on multilayer substrate“. In 1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium. IEEE, 1999. http://dx.doi.org/10.1109/ultsym.1999.849372.

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Wang, Ye, und Haopeng Zhang. „Star recognition based on mixed star pattern and multilayer SOM neural network“. In 2017 IEEE Aerospace Conference. IEEE, 2017. http://dx.doi.org/10.1109/aero.2017.7943942.

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Muller, Sebastian, Renato Rimolo-Donadio, Miroslav Kotzev, Heinz-Dietrich Bruns und Christian Schuster. „Effect of mixed-reference planes on single-ended and differential links in multilayer substrates“. In 2010 IEEE 14th Workshop on Signal Propagation on Interconnects (SPI 2010). IEEE, 2010. http://dx.doi.org/10.1109/spi.2010.5483587.

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Bin Sazali, Muhammad Arif, Nahrul Khair Alang Md Rashid und Khaidzir Hamzah. „Ant Colony Optimization of Multilayer Shielding for Mixed Neutron and Gamma Radiations: A Preliminary Study“. In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67765.

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Mixed neutron and gamma radiations require different shielding materials as their interaction with materials is different. Composites were developed in order to combine the shielding capabilities of different materials. However, their homogeneity is difficult to be assured which can lead to pinholes where radiation can penetrate. To avoid this problem, several materials arranged in layers can be used to shield against mixed radiations. Since the multilayer shielding can be made from any material in many configurations, the ant colony optimization (ACO) is a promising method because it deals with combinatorial optimization problems. The candidate materials are HDPE, boron, cadmium, gadolinium, tungsten, bismuth, and iron. Preliminary MCNP simulations were done to observe the effect of arrangements, thicknesses, and types of materials on the radiation spectrum. It was found that: (1) the final layer should be made of high density material, (2) an increase beyond certain thicknesses did not result in a significant increase in attenuation, and (3) there should be an optimum combination of material that can effectively shield against both neutrons and gamma rays.

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Nivens, Delana A., Maria V. Schiza und S. M. Angel. „Multilayer fiber optic chemical sensors employing organically modified SiO2 and mixed TiO2/SiO2 sol gel membranes“. In Environmental Sensing III, herausgegeben von Robert A. Lieberman. SPIE, 1997. http://dx.doi.org/10.1117/12.276134.

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Burr, G. W., K. Virwani, R. S. Shenoy, A. Padilla, M. BrightSky, E. A. Joseph, M. Lofaro et al. „Large-scale (512kbit) integration of multilayer-ready access-devices based on mixed-ionic-electronic-conduction (MIEC) at 100% yield“. In 2012 IEEE Symposium on VLSI Technology. IEEE, 2012. http://dx.doi.org/10.1109/vlsit.2012.6242451.

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Gopakumar, Sunil, Francois Billaut, Eric Fremd und Manthos Economou. „Pb-Free Process Development for a High End Storage Area Network Application“. In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33857.

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Lead free solders are being increasingly used in the electronic industry. While most of the electronic products, in terms of volume, are already built lead free, sectors of the industry including high end servers, networking and telecommunications are covered by “lead in solder” exemptions. It is unknown at this point how long these exemptions will last. In addition, many components such as memories have started appearing only in the Pb-free version. As a result, the industry has been pushed to either adopt a mixed assembly process or to transition early to a full Pb-free process. Even though numerous papers have outlined the successful implementation of a Pb-free process, few of them have actually looked at complex high-end multilayer boards in its entirety. This paper focuses on the issues involved in developing an acceptable Pb-free process window for thick, multilayer boards for SMT, Wave soldering, Rework and Press-fit operations. A laminate capable of withstanding Pb-free soldering temperatures was used to construct a 125-mil thick multilayer board with 18 layers which included 8 ground and 10 signal planes. This experiment utilized two popular Pb-free finishes commonly used in the industry: Immersion Silver and high temperature Organic Solderability Preservative (OSP). The widespread SAC 305 alloy with a composition of Sn3.0Ag0.5Cu was used for both SMT and wave soldering. Three sets of assemblies were built: Pb-free, Mixed and Sn/Pb. The mixed assembly mostly used Pb-free components with Sn/Pb solder paste. The impact of increased soldering temperatures on the board, components and reliability of the product were also studied as a part of this research endeavor. Board level reliability tests were conducted by subjecting the boards from 0°C to 100°C Air-to-Air thermal cycling as well as mechanical shock and vibration tests. A suite of reliability and destructive physical analysis (DPA) tests were carried out to establish the quality of the soldering using the eutectic Sn/Pb assembly as the baseline. The study compared the cycling performance of the three sets of assemblies and also looked at the potential impacts of moving to mixed assemblies. Results indicated a reduced process window for Pb-free, especially for the Pb-free wave soldering process due to reduced wetting of the plated through hole barrels as compared to Sn/Pb wave soldering process. The thermal cycling performance of the three sets of assemblies was found to be equivalent after 6000 cycles.

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