Готові списки джерел за темами / Heterogeneous solution

Добірка наукової літератури з теми "Heterogeneous solution"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Heterogeneous solution"

Serrano, Sergio E. "The Theis Solution in Heterogeneous Aquifers." Ground Water 35, no. 3 (May 1997): 463–67. http://dx.doi.org/10.1111/j.1745-6584.1997.tb00106.x.

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Baker-Jarvis, J., and R. Inguva. "Heat Conduction in Heterogeneous Materials." Journal of Heat Transfer 107, no. 1 (February 1, 1985): 39–43. http://dx.doi.org/10.1115/1.3247399.

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A new solution to the heat equation in composite media is derived using a variational principle developed by Ben-Amoz. The model microstructure is fed into the equations via a term for the polar moment of the inclusions in a representative volume. The general solution is presented as an integral in terms of sources and a Green function. The problem of uniqueness is studied to determine appropriate boundary conditions. The solution reduces to the solution of the normal heat equation in the limit of homogeneous media.

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KrishnaRambol, Radha, Nesar Ahmad, and B. K. Sharma. "Efficient Data Accessing through Heterogeneous ERP Solution." International Journal of Computer Applications 53, no. 6 (September 25, 2012): 14–17. http://dx.doi.org/10.5120/8423-2178.

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Mußotter, Maximilian, Markus Bier, and S. Dietrich. "Heterogeneous surface charge confining an electrolyte solution." Journal of Chemical Physics 152, no. 23 (June 21, 2020): 234703. http://dx.doi.org/10.1063/5.0006208.

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Han, J. S., D. M. Soh, C. W. Joh, B. I. Choi, Y. S. Lee, C. J. Lee, and C. H. Park. "Heterogeneous distribution of cardioplegic solution in pigs." British Journal of Anaesthesia 86, no. 3 (March 2001): 427–30. http://dx.doi.org/10.1093/bja/86.3.427.

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Aricò, Costanza, and Tullio Tucciarelli. "Monotonic solution of heterogeneous anisotropic diffusion problems." Journal of Computational Physics 252 (November 2013): 219–49. http://dx.doi.org/10.1016/j.jcp.2013.06.017.

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Lemaire, Marc. "Heterogeneous asymmetric catalysis." Pure and Applied Chemistry 76, no. 3 (January 1, 2004): 679–88. http://dx.doi.org/10.1351/pac200476030679.

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Examples of enantioselective catalysts, including homogeneous supported catalysts and biphasic liquid/liquid, are described and compared. In the case of asymmetric hydride transfer, polythiourea was proven to be more efficient for ruthenium-catalyzed reduction of arylketones, although the iridium complexes gave rise to higher ee when using amino sulfonamide bound to a polystyrene matrix. In the case of asymmetric reduction, the modification of the binap allows the formation of a polymer that could be used as a catalyst precursor and exhibits enantioselectivities as high as observed in solution, but easier to separate and recycle. Bisoxazoline bound to silica particules could also be used in copper-catalyzed asymmetric Diels-Alder reaction and cyclopropanation with selectivities similar to that obtained in solution.

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ALONSO, ANA. "A MATHEMATICAL JUSTIFICATION OF THE LOW-FREQUENCY HETEROGENEOUS TIME-HARMONIC MAXWELL EQUATIONS." Mathematical Models and Methods in Applied Sciences 09, no. 03 (April 1999): 475–89. http://dx.doi.org/10.1142/s0218202599000245.

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This paper deals with the low-frequency model for the time-harmonic Maxwell equations in a heterogeneous medium which behaves like a conductor in one part and a perfect insulator in the other. The model is justified comparing the solution with the one given by the high-frequency heterogeneous model. A bound for the norm of the difference in terms of the frequency is given. It is also proven that the solution of the heterogeneous problem is the limit of the solutions of problems in a conductor with conductivity that tends to zero in a part of the medium.

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Okazaki, M., and R. Z. Legeros. "Properties of Heterogeneous Apatites Containing Magnesium, Fluoride, and Carbonate." Advances in Dental Research 10, no. 2 (November 1996): 252–59. http://dx.doi.org/10.1177/08959374960100022201.

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Biological apatites present in the mineral phases of normal and pathological calcifications contain magnesium, Mg, and carbonate, CO3. As a consequence of fluctuations in the composition of the micro-environment, these apatites may sometimes form by heterogeneous precipitation. The purpose of this study was to investigate the properties of (Mg, CO3)-apatites formed heterogeneously in the presence of fluoride, F. Two types of fluoridated (Mg, CO3)-apatites formed from solutions with low and high levels of Mg were prepared at 80°C, pH 7.4. We prepared FMgCO3-MgCO 3AP (Type 1) by adding the F-containing solution to those containing calcium, Mg, and phosphate ions during the first half of the precipitation period. We prepared MgCO3-FMgCO3Ap (Type 2) by adding the F-containing solution during the final half of the period. The apatites were analyzed by x-ray diffraction (XRD), infrared absorption spectroscopy, and scanning electron microscopy (SEM). SEM and XRD analyses showed evidence of mixed crystals in the heterogeneous apatites. The presence of Mg inhibits, while F promotes, apatite crystal growth. In addition, Mg incorporation increased with increasing fluoride concentration. The extent of dissolution in acid buffer of both types of heterogeneous apatites increased with Mg: Type 1 > Type 2. These results suggest that the crystal and dissolution properties of heterogeneous fluoridated (Mg, C03)-apatites are greatly affected by the mode of F incorporation and Mg concentrations in the environment.

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Ayaz, Shehzad, Khurram Khattak, Zawar Khan, Nasru Minallah, Mushtaq Khan, and Akhtar Khan. "Sensing technologies for traffic flow characterization: From heterogeneous traffic perspective." Journal of Applied Engineering Science 20, no. 1 (2022): 29–40. http://dx.doi.org/10.5937/jaes0-32627.

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Importance of detailed traffic flow characterization is immense for achieving an intelligent transportation system. As such, great efforts in existing literature have gone into proposing different solutions for traffic flow characterization. Among these, first generation intrusive sensors such as pneumatic tube, inductive loop, piezoelectric and magnetic sensors were both labor intensive and expensive to install and maintain. These sensors were able to provide only vehicle count and classification under homogeneous traffic conditions. Second generation non-intrusive sensors based solutions, though a marked improvement over intrusive sensors, have the capability to only measure vehicle count, speed and classifications. Furthermore, both intrusive and non-intrusive sensor based solutions have limitations when employed under congested and heterogeneous traffic conditions. To overcome these limitations, a compute vision based solution has been proposed for traffic flow characterization under heterogeneous traffic behaviour. The proposed solution was field tested on a complex road configuration, consisting of a two-way multi-lane road with three U-turns. Unlike both intrusive and non-intrusive sensors, the proposed solution can detect pedestrians, two/ three wheelers and animal/human driven carts. Furthermore, detailed flow parameters such as vehicle count, speed, spatial/temporal densities, trajectories and heat maps were measured.

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Дисертації з теми "Heterogeneous solution"

Stewart, Donald F. Turner Eric G. "Solution analysis of universal wireless joint point technologies for heterogeneous tactical networks." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FStewart.pdf.

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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, March 2006.
Thesis Advisor(s): Alexander Bordetsky. "March 2006." Includes bibliographical references (p. 61-65). Also available online.

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Turner, Eric G. "Solution analysis of universal wireless joint point technologies for heterogeneous tactical networks." Thesis, Monterey, California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/2951.

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The scope of this thesis is to analyze the feasibility of having different wireless mesh network architectures transfer data to a wired network via a joint (universal) access point (UAP). Additionally this thesis analyzes the feasibility of using similar joint (universal) access point technology to allow heterogeneous wireless mesh network devices in close proximally to the UAP transmit data to/from each other via the UAP. This research also includes evaluating COTS tools for possible implementation of a joint access point as well as seeking partnership with private industry to assist in research efforts and/or the development or joint (universal) access point solution(s). The thesis concludes with a recommendation on application of universal joint point technology, to include recommendations for implementation of such technology in the Tactical Network Topology (TNT) environment.

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Guadagnini, Alberto, and Shlomo P. Neuman. "Nonlocal and localized finite element solution of conditional mean flow in randomly heterogeneous media." Department of Hydrology and Water Resources, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/615751.

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This report considers the effect of measuring randomly varying local hydraulic conductivities K(x) on one's ability to predict deterministically, without upscaling, steady state flow in bounded domains driven by random source and boundary terms. Our aim is to allow optimum unbiased prediction of hydraulic heads h(x) and Darcy fluxes q(x) by means of their ensemble moments, , and c, conditioned on measurements of K(x). It has been shown earlier that these predictors satisfy a deterministic flow equation which contains an integro-differential "residual flux" term. This term renders c nonlocal and non-Darcian so that the concept of effective hydraulic conductivity looses meaning in all but a few special cases. Instead, the residual flux contains kernels which constitute nonlocal parameters that are conditional on hydraulic conductivity data and therefore nonunique. The kernels include symmetric and nonsymmetric second -rank tensors as well as vectors. We derive exact integro-differential equations for second conditional moments of head and flux which constitute measures of predictive uncertainty. We then develop recursive closure approximations for the moment equations through expansion in powers of a small parameter ay which represents the standard estimation error of In K(x). Finally, we solve these nonlocal equations to first order in a by finite elements on a rectangular grid in two dimensions. We also solve the original stochastic flow equations by conditional Monte Carlo simulation using finite elements on the same grid. Upon comparing our nonlocal finite element and conditional Monte Carlo results we find that the former are highly accurate, under either mean uniform or convergent flows, for both mildly and strongly heterogeneous media with a as large as 4 - 5 and spatial correlation scales as large as the length of the domain. Since conditional mean quantities are smooth relative to their random counterparts our method allows, in principle, resolving them on relatively coarse grids without upscaling. We also examine the quc on under what conditions can the residual flux be localized so as to render it approximately Darcian. One way to achieve such localization is to treat ' "draulic conductivity as if it was locally homogeneous and mean flow as if it was locally uniform. This renders the flux predictor Darcian according to c _ - Kc(x) \7c where Kc(x) is a conditional hydraulic conductivity tensor which depends on measurements of K(x) and is therefore a nonunique function of space. This function can be estimated by means of either stochastically- derived analytical formulae or standard inverse methods (in which case localization coincides with common groundwater modeling practice). We use the first approach and solve the corresponding localized conditional mean equation by finite elements on the same grid as before. Here the conditional hydraulic conductivity is given by the geometric mean KG(x). Upon comparing our localized finite element solution with a nonlocal finite element solution and conditional Monte Carlo results, we find that the first is generally less accurate than the second. The accuracy of the localized solution deteriorates rel tive to that of the nonlocal solution as one approaches points of conditioning and singularity, or as the variance and correla': ^n scale of the log hydraulic conductivity increase. Contrary to the nonlocal solution, locàlzation does not yield information about predictive uncertainty.

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Richardson, John Michael. "Distinguishing between surface and solution catalysis for palladium catalyzed C-C coupling reactions: use of selective poisons." Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22704.

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This work focuses on understanding the heterogeneous/homogeneous nature of the catalytic species for a variety of immobilized metal precatalysts used for C-C coupling reactions. These precatalysts include: (i) tethered organometallic palladium pincer complexes, (ii) an encapsulated small molecule palladium complex in a polymer matrix, (iii) mercapto-modified mesoporous silica metalated with palladium acetate, and (iv) amino-functionalized mesoporous silicas metalated with Ni(II). As part of this investigation, the use of metal scavengers as selective poisons of homogeneous catalysis is introduced and investigated as a test for distinguishing heterogeneous from homogeneous catalysis. The premise of this test is that insoluble materials functionalized with metal binding sites can be used to selectively remove soluble metal, but will not interfere with catalysis from immobilized metal. In this way the test can definitely distinguish between surface and solution catalysis of immobilized metal precatalysts. This work investigates three different C-C coupling reactions catalyzed by the immobilized metal precatalysts mentioned above. These reactions include the Heck, Suzuki, and Kumada reactions. In all cases it is found that catalysis is solely from leached metal. Three different metal scavenging materials are presented as selective poisons that can be used to determine solution vs. surface catalysis. These selective poisons include poly(vinylpyridine), QuadrapureTM TU, and thiol-functionalized mesoporous silica. The results are contrasted against the current understanding of this field of research and subtleties of tests for distinguishing homogeneous from heterogeneous catalysis are presented and discussed.

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Kümmel, Monika. "Nanocraters : a bottom-up approach towards heterogeneous inorganic nanopatterns by copolymer templated chemical solution deposition." Paris 6, 2008. http://www.theses.fr/2008PA066324.

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Des motifs nanométriques d’oxydes métalliques (TiO2, Al2O3, ZrO2) étaient synthétisés avec une technique bottom-up. Un mélange de précurseurs moléculaires et de micelles préformées des copolymères à block est déposé sur des substrats tels que la silice, l’or ou l’ITO par voie de trempage. Des monocouches de micelles entourées par les espèces inorganiques sont deposées à des concentrations et des vitesses de dépôt faibles. Calcination élimine les copolymères et des motifs (perforations rondes, canaux, anneaux,…) rigides d’oxyde métallique sont obtenus. La présence de monocouches de perforations d’un diamètre entre 10 et 70nm ainsi que l’accessibilité de la surface du substrat a travers ces perforations a été confirme avec plusieurs méthodes de caractérisation. Les dessins du type nanocrateres sont bifunctionels, peuvent être functionalisé sélectivement et ont une bonne stabilité mécanique, thermique et chimique ce qui fait que ces matériaux sont intéressants pour plusieurs applications
Metal oxide nanopatterns (TiO2, Al2O3, ZrO2) were synthesised with a bottom up technique that combines the method of chemical solution deposition and the self-organisation properties of block copolymer micelles on a substrate surface through Evaporation Induced Micelle Packing (EIMP). Molecular precursors were mixed with micelles in EtOH/THF/H2O or EtOH/THF and the solutions were dip coated onto various substrates such as silicon wafers, gold or ITO. High dilution and low withdrawal speed lead to the deposition of micelle monolayers surrounded by inorganic precursors. A calcination step eliminates the block copolymer and rigid metal oxide nanopatterns with various motifs like circular perforations (nanocraters), channels or rings are obtained. The size and kind of the motifs can be controlled by adjusting several crucial parameters during solution preparation like the kind and size of the used block copolymer in combination with the used solvent composition, concentration and conditioning. High kinetics of evaporation during the dip coating further allow ordering of nanocrater perforations in hexagonal patterns. The synthesised patterns were characterised by ellipsometry, AFM, FEG-SEM, GISAXS, XPS, cyclic voltametry and contact angle measurements. The presence of monolayers of perforations with diameters of 10-70nm and accessibility of the substrate surface through the perforations was confirmed. Nanocrater patterns show inherent bifunctionality and the substrate surface and the pattern can be selectively functionalised. In addition, nanocrater patterns are mechanically, chemically and thermally stable and are therefore interesting materials for various kinds of applications

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Briones, Delgado Alan. "Transport Layer solution for bulk data transfers over Heterogeneous Long Fat Networks in Next Generation Networks." Doctoral thesis, Universitat Ramon Llull, 2021. http://hdl.handle.net/10803/672429.

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Aquesta tesi per compendi centra les seves contribucions en l'aprenentatge i innovació de les Xarxes de Nova Generació. És per això que es proposen diferents contribucions en diferents àmbits (Smart Cities, Smart Grids, Smart Campus, Smart Learning, Mitjana, eHealth, Indústria 4.0 entre d'altres) mitjançant l'aplicació i combinació de diferents disciplines (Internet of Things, Building Information Modeling, Cloud Storage, Ciberseguretat, Big Data, Internet de el Futur, Transformació Digital). Concretament, es detalla el monitoratge sostenible del confort a l'Smart Campus, la que potser es la meva aportació més representativa dins de la conceptualització de Xarxes de Nova Generació. Dins d'aquest innovador concepte de monitorització s'integren diferents disciplines, per poder oferir informació sobre el nivell de confort de les persones. Aquesta investigació demostra el llarg recorregut que hi ha en la transformació digital dels sectors tradicionals i les NGNs. Durant aquest llarg aprenentatge sobre les NGN a través de les diferents investigacions, es va poder observar una problemàtica que afectava de manera transversal als diferents camps d'aplicació de les NGNs i que aquesta podia tenir una afectació en aquests sectors. Aquesta problemàtica consisteix en el baix rendiment durant l'intercanvi de grans volums de dades sobre xarxes amb gran capacitat d'ample de banda i remotament separades geogràficament, conegudes com a xarxes elefant. Concretament, això afecta al cas d'ús d'intercanvi massiu de dades entre regions Cloud (Cloud Data Sharing use case). És per això que es va estudiar aquest cas d'ús i les diferents alternatives a nivell de protocols de transport,. S'estudien les diferents problemàtiques que pateixen els protocols i s'observa per què aquests no són capaços d'arribar a rendiments òptims. Deguda a aquesta situació, s'hipotetiza que la introducció de mecanismes que analitzen les mètriques de la xarxa i que exploten eficientment la capacitat de la mateixa milloren el rendiment dels protocols de transport sobre xarxes elefant heterogènies durant l'enviament massiu de dades. Primerament, es dissenya l’Adaptative and Aggressive Transport Protocol (AATP), un protocol de transport adaptatiu i eficient amb l'objectiu de millorar el rendiment sobre aquest tipus de xarxes elefant. El protocol AATP s'implementa i es prova en un simulador de xarxes i un testbed sota diferents situacions i condicions per la seva validació. Implementat i provat amb èxit el protocol AATP, es decideix millorar el propi protocol, Enhanced-AATP, sobre xarxes elefant heterogènies. Per això, es dissenya un mecanisme basat en el Jitter Ràtio que permet fer aquesta diferenciació. A més, per tal de millorar el comportament del protocol, s’adapta el seu sistema de fairness per al repartiment just dels recursos amb altres fluxos Enhanced-AATP. Aquesta evolució s'implementa en el simulador de xarxes i es realitzen una sèrie de proves. A l'acabar aquesta tesi, es conclou que les Xarxes de Nova Generació tenen molt recorregut i moltes coses a millorar causa de la transformació digital de la societat i de l'aparició de nova tecnologia disruptiva. A més, es confirma que la introducció de mecanismes específics en la concepció i operació dels protocols de transport millora el rendiment d'aquests sobre xarxes elefant heterogènies.
Esta tesis por compendio centra sus contribuciones en el aprendizaje e innovación de las Redes de Nueva Generación. Es por ello que se proponen distintas contribuciones en diferentes ámbitos (Smart Cities, Smart Grids, Smart Campus, Smart Learning, Media, eHealth, Industria 4.0 entre otros) mediante la aplicación y combinación de diferentes disciplinas (Internet of Things, Building Information Modeling, Cloud Storage, Ciberseguridad, Big Data, Internet del Futuro, Transformación Digital). Concretamente, se detalla la monitorización sostenible del confort en el Smart Campus, la que se podría considerar mi aportación más representativa dentro de la conceptualización de Redes de Nueva Generación. Dentro de este innovador concepto de monitorización se integran diferentes disciplinas, para poder ofrecer información sobre el nivel de confort de las personas. Esta investigación demuestra el recorrido que existe en la transformación digital de los sectores tradicionales y las NGNs. Durante este largo aprendizaje sobre las NGN a través de las diferentes investigaciones, se pudo observar una problemática que afectaba de manera transversal a los diferentes campos de aplicación de las NGNs y que ésta podía tener una afectación en estos sectores. Esta problemática consiste en el bajo rendimiento durante el intercambio de grandes volúmenes de datos sobre redes con gran capacidad de ancho de banda y remotamente separadas geográficamente, conocidas como redes elefante, o Long Fat Networks (LFNs). Concretamente, esto afecta al caso de uso de intercambio de datos entre regiones Cloud (Cloud Data Data use case). Es por ello que se estudió este caso de uso y las diferentes alternativas a nivel de protocolos de transporte. Se estudian las diferentes problemáticas que sufren los protocolos y se observa por qué no son capaces de alcanzar rendimientos óptimos. Debida a esta situación, se hipotetiza que la introducción de mecanismos que analizan las métricas de la red y que explotan eficientemente la capacidad de la misma mejoran el rendimiento de los protocolos de transporte sobre redes elefante heterogéneas durante el envío masivo de datos. Primeramente, se diseña el Adaptative and Aggressive Transport Protocol (AATP), un protocolo de transporte adaptativo y eficiente con el objetivo maximizar el rendimiento sobre este tipo de redes elefante. El protocolo AATP se implementa y se prueba en un simulador de redes y un testbed bajo diferentes situaciones y condiciones para su validación. Implementado y probado con éxito el protocolo AATP, se decide mejorar el propio protocolo, Enhanced-AATP, sobre redes elefante heterogéneas. Además, con tal de mejorar el comportamiento del protocolo, se mejora su sistema de fairness para el reparto justo de los recursos con otros flujos Enhanced-AATP. Esta evolución se implementa en el simulador de redes y se realizan una serie de pruebas. Al finalizar esta tesis, se concluye que las Redes de Nueva Generación tienen mucho recorrido y muchas cosas a mejorar debido a la transformación digital de la sociedad y a la aparición de nueva tecnología disruptiva. Se confirma que la introducción de mecanismos específicos en la concepción y operación de los protocolos de transporte mejora el rendimiento de estos sobre redes elefante heterogéneas.
This compendium thesis focuses its contributions on the learning and innovation of the New Generation Networks. That is why different contributions are proposed in different areas (Smart Cities, Smart Grids, Smart Campus, Smart Learning, Media, eHealth, Industry 4.0, among others) through the application and combination of different disciplines (Internet of Things, Building Information Modeling, Cloud Storage, Cybersecurity, Big Data, Future Internet, Digital Transformation). Specifically, the sustainable comfort monitoring in the Smart Campus is detailed, which can be considered my most representative contribution within the conceptualization of New Generation Networks. Within this innovative monitoring concept, different disciplines are integrated in order to offer information on people's comfort levels. . This research demonstrates the long journey that exists in the digital transformation of traditional sectors and New Generation Networks. During this long learning about the NGNs through the different investigations, it was possible to observe a problematic that affected the different application fields of the NGNs in a transversal way and that, depending on the service and its requirements, it could have a critical impact on any of these sectors. This issue consists of a low performance operation during the exchange of large volumes of data on networks with high bandwidth capacity and remotely geographically separated, also known as Elephant networks, or Long Fat Networks (LFNs). Specifically, this critically affects the Cloud Data Sharing use case. That is why this use case and the different alternatives at the transport protocol level were studied. For this reason, the performance and operation problems suffered by layer 4 protocols are studied and it is observed why these traditional protocols are not capable of achieving optimal performance. Due to this situation, it is hypothesized that the introduction of mechanisms that analyze network metrics and efficiently exploit network’s capacity meliorates the performance of Transport Layer protocols over Heterogeneous Long Fat Networks during bulk data transfers. First, the Adaptive and Aggressive Transport Protocol (AATP) is designed. An adaptive and efficient transport protocol with the aim of maximizing its performance over this type of elephant network.. The AATP protocol is implemented and tested in a network simulator and a testbed under different situations and conditions for its validation. Once the AATP protocol was designed, implemented and tested successfully, it was decided to improve the protocol itself, Enhanced-AATP, to improve its performance over heterogeneous elephant networks. In addition, in order to upgrade the behavior of the protocol, its fairness system is improved for the fair distribution of resources among other Enhanced-AATP flows. Finally, this evolution is implemented in the network simulator and a set of tests are carried out. At the end of this thesis, it is concluded that the New Generation Networks have a long way to go and many things to improve due to the digital transformation of society and the appearance of brand-new disruptive technology. Furthermore, it is confirmed that the introduction of specific mechanisms in the conception and operation of transport protocols improves their performance on Heterogeneous Long Fat Networks.

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Pinel, Xavier. "A perturbed two-level preconditioner for the solution of three-dimensional heterogeneous Helmholtz problems with applications to geophysics." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0033/document.

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Le sujet de cette thèse est le développement de méthodes itératives permettant la résolution degrands systèmes linéaires creux d'équations présentant plusieurs seconds membres simultanément. Ces méthodes seront en particulier utilisées dans le cadre d'une application géophysique : la migration sismique visant à simuler la propagation d'ondes sous la surface de la terre. Le problème prend la forme d'une équation d'Helmholtz dans le domaine fréquentiel en trois dimensions, discrétisée par des différences finies et donnant lieu à un système linéaire creux, complexe, non-symétrique, non-hermitien. De plus, lorsque de grands nombres d'onde sont considérés, cette matrice possède une taille élevée et est indéfinie. Du fait de ces propriétés, nous nous proposons d'étudier des méthodes de Krylov préconditionnées par des techniques hiérarchiques deux niveaux. Un tel pre-conditionnement s'est montré particulièrement efficace en deux dimensions et le but de cette thèse est de relever le défi de l'adapter au cas tridimensionel. Pour ce faire, des méthodes de Krylov sont utilisées à la fois comme lisseur et comme méthode de résolution du problème grossier. Ces derniers choix induisent l'emploi de méthodes de Krylov dites flexibles
The topic of this PhD thesis is the development of iterative methods for the solution of large sparse linear systems of equations with possibly multiple right-hand sides given at once. These methods will be used for a specific application in geophysics - seismic migration - related to the simulation of wave propagation in the subsurface of the Earth. Here the three-dimensional Helmholtz equation written in the frequency domain is considered. The finite difference discretization of the Helmholtz equation with the Perfect Matched Layer formulation produces, when high frequencies are considered, a complex linear system which is large, non-symmetric, non-Hermitian, indefinite and sparse. Thus we propose to study preconditioned flexible Krylov subspace methods, especially minimum residual norm methods, to solve this class of problems. As a preconditioner we consider multi-level techniques and especially focus on a two-level method. This twolevel preconditioner has shown efficient for two-dimensional applications and the purpose of this thesis is to extend this to the challenging three-dimensional case. This leads us to propose and analyze a perturbed two-level preconditioner for a flexible Krylov subspace method, where Krylov methods are used both as smoother and as approximate coarse grid solver

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Cheng, Hua. "Hydrodynamic control of retention in heterogeneous aquifers and fractured rock." Doctoral thesis, Stockholm : KTH Architecture and the Built Environment, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-496.

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De, Boer Jeroen Wouter. "Approximate Models And Solution Approaches For The Vehicle Routing Problem With Multiple Use Of Vehicles And Time Windows." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609620/index.pdf.

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In this study we discuss the Vehicle Routing Problem with multiple use of vehicles (VRPM). In this variant of the routing problem the vehicles may replenish at any time at the depot. We present a detailed review of existing literature and propose two mathematical models to solve the VRPM. For these two models and their several variants we provide computational results based on the test problems taken from the literature. We also discuss a case study in which we are simultaneously dealing with side constraints such as time windows, working hour limits, backhaul customers and a heterogeneous vehicle fleet.

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Kribeche, Mohamed El Amine. "Dégradation photocatalytique des composés organiques en solution aqueuse en présence de TiO₂ et des oxydes de fer : influence des acides carboxyliques." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT140.

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Cette étude s’inscrit dans le cadre de la dépollution de l’eau, elle a eu pour but d’examiner la dégradation photocatalytique d’herbicides phénylurées en solution aqueuse à pH acide, en présence d’un oxyde de fer naturel et d’acides carboxyliques. L’oxyde de fer naturel a été caractérisé par spectroscopie Raman, l’identification des produits de dégradation du fénuron et la proposition d’un mécanisme de dégradation ont été réalisées. Deux types d’irradiation ont été utilisés, i.e. l’irradiation solaire naturelle et l’irradiation par des UV générés par des lampes à vapeur de mercure. La photodégradation du fenuron en présence d’oxyde de fer naturel et l'acide oxalique obéit à une loi du premier ordre, les conditions expérimentales optimales pour ce système étaient [acide oxalique]0 = 10-3 M, [Hématite naturelle] = 0.1 g L-1 ; pH = 3. Le temps de demi-vie du fenuron est court (60 32 min) mais les résultats sont meilleurs sous irradiation solaire naturelle (30 15 min). L'acide oxalique est l’acide carboxylique le plus efficace en photodégradation du fénuron (disparition totale), l’ordre d’efficacité varie ainsi : acide oxalique > acide citrique > acide tartrique > acide malique. L’étude analytique de la dégradation du fénuron par ce procédé a permis l’identification de huit photoproduits aromatiques, de trois acides carboxyliques à courte chaîne de carbone et des ions inorganiques. Ce travail a permis de mettre en évidence le rôle de l’oxygène dissous dans le processus de dégradation du fenuron par le procédé de photo-Fenton-like, le processus ne peut pas avoir lieu en milieu désoxygéné car aucune production de H2O2 n’a été observée sous irradiation UV. L’oxygénation du milieu permet d’améliorer la capacité oxydative du procédé et d’augmenter le taux de minéralisation du carbone organique totale. En effet l’oxygénation du milieu augmente indirectement la production des radicaux hydroxyles par augmentation de la production de H2O2. Il a été mis en évidence pendant l’étude quantitative que l’oxygène était le réactif le plus consommé par ce procédé. Le traitement de la solution contenant 10-4 M de fenuron et 10-3 M d’oxalate a permis de réduire significativement la toxicité de la solution initiale après 360 minutes d’irradiation
The photodegradation of the herbicide phenylurea by using a natural iron oxide (NIO) α-Fe2O3 in aqueous solution at acidic pH has been undertaken. The NIO was characterized by the Raman spectroscopy method. The degradation pathways and the formation of by-products were studied. A high-pressure mercury lamp and sunlight were employed as light source. Fenuron photodegradation using NIO with oxalic acid followed the pseudo-first order kinetics, the optimal experimental conditions were [oxalic acid]0 = 10−3 M and [NIO] = 0.1 g L−1 at pH 3. NIO/oxalic acid/UV system led to a low fenuron half-life (32 min). The results were even better when solar light is used (15 min). The effect of four carboxylic acids; oxalic, citric, tartaric and malic acids on the degradation efficiency was studied. Oxalic acid was the most effective carboxylic acid used on the fenuron photodegradation with NIO at pH 3. The analytical study showed many aromatic intermediates, short-chain carboxylic acids and inorganic ion.The role of dissolved oxygen (DO) in degradation and mineralization of fenuron in the photo-Fenton-like system by using the NIO was also studied; the NIO was used as an iron source. The DO effect has been elucidated by carrying out experiments with and without oxygen, it has been found that the degradation and mineralization rate were strongly affected by change in DO concentration. In absence of oxygen, there is no photo-Fenton-like because of the lack of hydrogen peroxide, the degradation was caused only by the photo-reduction of Fe(III) complex in this case. Oxygenation improved the hydrogen peroxide production under irradiation. The mass balance of the reactive species showed that dissolved oxygen was the main reactive consumed during the process. The toxicity decrease with irradiation time proves that the intermediates generated during photo-oxidation by the photo-Fenton-like system by using a NIO are less toxic than fenuron

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Книги з теми "Heterogeneous solution"

Topolov, Vitaly. Heterogeneous Ferroelectric Solid Solutions. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22483-6.

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Topolov, Vitaly Yu. Heterogeneous Ferroelectric Solid Solutions. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75520-5.

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1931-, Steinmann Heinrich, ed. Solutions for networked databases: How to move from heterogeneous structures to federated concepts. San Diego: Academic Press, 1993.

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S, Salzar Robert, and Langley Research Center, eds. Optimization of residual stresses in MMC's through process parameter control and the use of heterogeneous compensating/complaint interfacial layers: OPTCOMP2 user's guide. Hampton, Va: National Aeronautics and Space Administration, 1996.

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Topolov, Vitaly. Heterogeneous Ferroelectric Solid Solutions: Phases and Domain States. Springer, 2011.

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Heterogeneous Ferroelectric Solid Solutions Phases And Domain States. Springer, 2011.

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Topolov, Vitaly Yu. Heterogeneous Ferroelectric Solid Solutions: Phases and Domain States. Springer, 2018.

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Topolov, Vitaly Yu. Heterogeneous Ferroelectric Solid Solutions: Phases and Domain States. Springer, 2018.

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Redbooks, IBM. Data Sharing: Implementing Infospeed Copy-Sharing Solutions Among Heterogeneous Systems. Ibm, 1998.

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Частини книг з теми "Heterogeneous solution"

Pulini, Gabriele, and David Hulance. "Flexeos Embedded FPGA Solution." In Dynamic System Reconfiguration in Heterogeneous Platforms, 39–47. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2427-5_4.

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Manassen, J., D. Cahen, G. Hodes, R. Tenne, and S. Licht. "The Importance of Solution Kinetics in Photoelectrochemical Phenomena." In Homogeneous and Heterogeneous Photocatalysis, 335–41. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4642-2_20.

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Grigorenko, Alexander Ya, Wolfgang H. Müller, Yaroslav M. Grigorenko, and Georgii G. Vlaikov. "Discrete-Continuous Methods for Solution." In Recent Developments in Anisotropic Heterogeneous Shell Theory, 27–51. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-10-0353-0_2.

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Dauda, Suleiman Alhaji, Mohd Rusli Yacob, and Alias Radam. "Heterogeneous Preferences for Domestic Water Quality Service Improvement: A Mixed Logit Approach." In From Sources to Solution, 609–13. Singapore: Springer Singapore, 2013. http://dx.doi.org/10.1007/978-981-4560-70-2_108.

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Phani Praveen, S., and K. Thirupathi Rao. "An Optimized Rendering Solution for Ranking Heterogeneous VM Instances." In Advances in Intelligent Systems and Computing, 159–67. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7566-7_17.

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Kotoul, Michal, Tomáš Profant, Oldrich Sevecek, and Martin Krejcir. "Solution Methods for General Stress Concentrators in Anisotropic Heterogeneous Media." In Advances in Fracture and Damage Mechanics VI, 677–80. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-448-0.677.

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Discacciati, Marco, Paola Gervasio, and Alfio Quarteroni. "Heterogeneous Mathematical Models in Fluid Dynamics and Associated Solution Algorithms." In Lecture Notes in Mathematics, 57–123. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24079-9_2.

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Tabor, Christopher, Radha Narayanan, and Mostafa A. El-Sayed. "Catalysis with Transition Metal Nanoparticles in Colloidal Solution: Heterogeneous or Homogeneous?" In Model Systems in Catalysis, 395–414. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-98049-2_18.

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Shani, Uri, Aviad Sela, Alex Akilov, Inna Skarbovski, and David Berk. "A Scalable Heterogeneous Solution for Massive Data Collection and Database Loading." In Lecture Notes in Computer Science, 50–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73950-0_5.

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Swain, P. K., and P. K. Panda. "IoT System with Heterogeneous Servers: Steady-State Solution and Performance Evaluation." In The Role of IoT and Blockchain, 135–44. Boca Raton: Apple Academic Press, 2022. http://dx.doi.org/10.1201/9781003048367-12.

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Тези доповідей конференцій з теми "Heterogeneous solution"

Sinclair, Andrew J., T. Alan Lovell, and Jacob Darling. "RF localization solution using heterogeneous TDOA." In 2015 IEEE Aerospace Conference. IEEE, 2015. http://dx.doi.org/10.1109/aero.2015.7119256.

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Woolf, Thomas B., Alan Grossfield, and Daniel M. Zuckerman. "Electrostatics of membrane systems—complex, heterogeneous environments." In SIMULATION AND THEORY OF ELECTROSTATIC INTERACTIONS IN SOLUTION. ASCE, 1999. http://dx.doi.org/10.1063/1.1301545.

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Pajaro, Joswill, and Amir Esmailpour. "Unified provisioning solution for heterogeneous Wireless Networks." In 2014 IEEE 27th Canadian Conference on Electrical and Computer Engineering (CCECE). IEEE, 2014. http://dx.doi.org/10.1109/ccece.2014.6900949.

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Sayed, Heba Allah, Ashraf William Ibrahim, and Hanaa Ebrahim. "New signaling solution for heterogeneous access networks." In 2016 2nd IEEE International Conference on Computer and Communications (ICCC). IEEE, 2016. http://dx.doi.org/10.1109/compcomm.2016.7925066.

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Tooba, Maryam, Aslam Muhammad, and Ana Maria Martinez-Enriquez. "Smart Solution for Heterogeneous Device Interoperability in IoT." In 2018 Seventeenth Mexican International Conference on Artificial Intelligence (MICAI). IEEE, 2018. http://dx.doi.org/10.1109/micai46078.2018.00019.

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Jie, Yu, Ahmad Alsharoa, Ahmed Kamal, and Mohammad Alnuem. "Self-Healing Solution to Heterogeneous Networks Using CoMP." In GLOBECOM 2015 - 2015 IEEE Global Communications Conference. IEEE, 2014. http://dx.doi.org/10.1109/glocom.2014.7417265.

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Palazzi, Claudio E., Nicola Stievano, and Marco Roccetti. "A smart access point solution for heterogeneous flows." In Workshops (ICUMT). IEEE, 2009. http://dx.doi.org/10.1109/icumt.2009.5345522.

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Morikawa, Yasuhiro. "Advanced Package Wiring Technology Solution for Heterogeneous Integration." In 2019 Pan Pacific Microelectronics Symposium (Pan Pacific). IEEE, 2019. http://dx.doi.org/10.23919/panpacific.2019.8696855.

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Wu, Zhihui, Yang Xiao, Enyuan Zhou, Qingqi Pei, and Quan Wang. "A Solution to Data Accessibility Across Heterogeneous Blockchains." In 2020 IEEE 26th International Conference on Parallel and Distributed Systems (ICPADS). IEEE, 2020. http://dx.doi.org/10.1109/icpads51040.2020.00062.

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Звіти організацій з теми "Heterogeneous solution"

Cheng, A. M. Development of general inflow performance relationships (IPR's) for slanted and horizontal wells producing heterogeneous solution-gas drive reservoirs. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/5596773.

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Cheng, A. M. Development of general inflow performance relationships (IPR`s) for slanted and horizontal wells producing heterogeneous solution-gas drive reservoirs. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/10137825.

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Zhang, Cheng, and Yue Yang. Impact of adaptive design on reducing the duration of clinical trials in rare cancers: a meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, February 2022. http://dx.doi.org/10.37766/inplasy2022.2.0081.

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Review question / Objective: Whether the application of adaptive design in clinical trials of rare cancers can shorten the duration of clinical trials? Condition being studied: Currently, the development of innovative drug products (InMPs) for rare cancers faces many challenges, including the difficulty of enrolling sufficient numbers of patients from small and heterogeneous patient populations for clinical trials, and the significant risks of high financial investment, long development times and potential failure from a pharmaceutical company's perspective for rare cancer drugs due to limited knowledge of the natural history of the disease. Therefore, alternative approaches to clinical trial design are needed to conduct cost-effective, well-controlled analyses that can assess treatment effects in small, heterogeneous populations within shorter time frames. Adaptive trials, on the other hand, may be an effective solution to this problem. Adaptive clinical trials are designed to accelerate the clinical trial process by making predefined adjustments to key parameters through data accumulated at predefined time points during the trial without compromising the integrity and validity of the results.This study aims to examine the value of adaptive design in reducing the duration of clinical trials in rare cancers and encourage their wider implementation.

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Skinner, James. SISGR: Water dynamics in heterogeneous and confined environments: Salt solutions, reverse micelles, and lipid multi-bilayers. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1104482.

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Robinson, Troy A. Equilibrium Speciation of Select Lanthanides in the Presence of Acidic Ligands in Homo- and Heterogeneous Solutions. Office of Scientific and Technical Information (OSTI), August 2011. http://dx.doi.org/10.2172/1024547.

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Hampden-Smith, M., J. S. Kawola, A. Martino, A. G. Sault, and S. A. Yamanaka. Highly Dispersed Pseudo-Homogeneous and Heterogeneous Catalysts Synthesized via Inverse Micelle Solutions for the Liquefaction of Coal. Office of Scientific and Technical Information (OSTI), January 1999. http://dx.doi.org/10.2172/2606.

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Russo, David, Daniel M. Tartakovsky, and Shlomo P. Neuman. Development of Predictive Tools for Contaminant Transport through Variably-Saturated Heterogeneous Composite Porous Formations. United States Department of Agriculture, December 2012. http://dx.doi.org/10.32747/2012.7592658.bard.

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The vadose (unsaturated) zone forms a major hydrologic link between the ground surface and underlying aquifers. To understand properly its role in protecting groundwater from near surface sources of contamination, one must be able to analyze quantitatively water flow and contaminant transport in variably saturated subsurface environments that are highly heterogeneous, often consisting of multiple geologic units and/or high and/or low permeability inclusions. The specific objectives of this research were: (i) to develop efficient and accurate tools for probabilistic delineation of dominant geologic features comprising the vadose zone; (ii) to develop a complementary set of data analysis tools for discerning the fractal properties of hydraulic and transport parameters of highly heterogeneous vadose zone; (iii) to develop and test the associated computational methods for probabilistic analysis of flow and transport in highly heterogeneous subsurface environments; and (iv) to apply the computational framework to design an “optimal” observation network for monitoring and forecasting the fate and migration of contaminant plumes originating from agricultural activities. During the course of the project, we modified the third objective to include additional computational method, based on the notion that the heterogeneous formation can be considered as a mixture of populations of differing spatial structures. Regarding uncertainly analysis, going beyond approaches based on mean and variance of system states, we succeeded to develop probability density function (PDF) solutions enabling one to evaluate probabilities of rare events, required for probabilistic risk assessment. In addition, we developed reduced complexity models for the probabilistic forecasting of infiltration rates in heterogeneous soils during surface runoff and/or flooding events Regarding flow and transport in variably saturated, spatially heterogeneous formations associated with fine- and coarse-textured embedded soils (FTES- and CTES-formations, respectively).We succeeded to develop first-order and numerical frameworks for flow and transport in three-dimensional (3-D), variably saturated, bimodal, heterogeneous formations, with single and dual porosity, respectively. Regarding the sampling problem defined as, how many sampling points are needed, and where to locate them spatially in the horizontal x₂x₃ plane of the field. Based on our computational framework, we succeeded to develop and demonstrate a methdology that might improve considerably our ability to describe quntitaively the response of complicated 3-D flow systems. The results of the project are of theoretical and practical importance; they provided a rigorous framework to modeling water flow and solute transport in a realistic, highly heterogeneous, composite flow system with uncertain properties under-specified by data. Specifically, they: (i) enhanced fundamental understanding of the basic mechanisms of field-scale flow and transport in near-surface geological formations under realistic flow scenarios, (ii) provided a means to assess the ability of existing flow and transport models to handle realistic flow conditions, and (iii) provided a means to assess quantitatively the threats posed to groundwater by contamination from agricultural sources.

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Baloch, Imdad, Tom Kaye, Saalim Koomar, and Chris McBurnie. Pakistan Topic Brief: Providing Distance Learning to Hard-to-reach Children. EdTech Hub, June 2020. http://dx.doi.org/10.53832/edtechhub.0026.

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The COVID-19 pandemic has resulted in mass school closures across the world. It is expected that the closures in low- and -middle-income countries (LMICs) will have long-term negative consequences on education and also on broader development outcomes. Countries face a number of obstacles to effectively delivering alternative forms of education. Obstacles include limited experience in facing such challenges, limited teacher digital and pedagogical capacity, and infrastructure constraints related to power and connectivity. Furthermore, inequalities in learning outcomes are expected to widen within LMICs due to the challenges of implementing alternative modes of education in remote, rural or marginalised communities. It is expected that the most marginalised children will feel the most substantial negative impacts on their learning outcomes. Educational technology (EdTech) has been identified as a possible solution to address the acute impact of school closures through its potential to provide distance education. In this light, the DFID Pakistan team requested the EdTech Hub develop a topic brief exploring the use of EdTech to support distance learning in Pakistan. Specifically, the team requested the brief explore ways to provide distance education to children in remote rural areas and urban slums. The DFID team also requested that the EdTech Hub explore the different needs of those who have previously been to school in comparison to those who have never enrolled, with reference to EdTech solutions. In order to address these questions, this brief begins with an overview of the Pakistan education landscape. The second section of the brief explores how four modes of alternative education — TV, interactive radio instruction, mobile phones and online learning — can be used to provide alternative education to marginalised groups in Pakistan. Multimodal distance-learning approaches offer the best means of providing education to heterogeneous, hard-to-reach groups. Identifying various tools that can be deployed to meet the needs of specific population segments is an important part of developing a robust distance-learning approach. With this in mind, this section highlights examples of tools that could be used in Pakistan to support a multimodal approach that reaches the most hard-to-reach learners. The third and final section synthesises the article’s findings, presenting recommendations to inform Pakistan’s COVID-19 education response.<br> <br> This topic brief is available on Google Docs.

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Kodupuganti, Swapneel R., Sonu Mathew, and Srinivas S. Pulugurtha. Modeling Operational Performance of Urban Roads with Heterogeneous Traffic Conditions. Mineta Transportation Institute, January 2021. http://dx.doi.org/10.31979/mti.2021.1802.

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The rapid growth in population and related demand for travel during the past few decades has had a catalytic effect on traffic congestion, air quality, and safety in many urban areas. Transportation managers and planners have planned for new facilities to cater to the needs of users of alternative modes of transportation (e.g., public transportation, walking, and bicycling) over the next decade. However, there are no widely accepted methods, nor there is enough evidence to justify whether such plans are instrumental in improving mobility of the transportation system. Therefore, this project researches the operational performance of urban roads with heterogeneous traffic conditions to improve the mobility and reliability of people and goods. A 4-mile stretch of the Blue Line light rail transit (LRT) extension, which connects Old Concord Rd and the University of North Carolina at Charlotte’s main campus on N Tryon St in Charlotte, North Carolina, was considered for travel time reliability analysis. The influence of crosswalks, sidewalks, trails, greenways, on-street bicycle lanes, bus/LRT routes and stops/stations, and street network characteristics on travel time reliability were comprehensively considered from a multimodal perspective. Likewise, a 2.5-mile-long section of the Blue Line LRT extension, which connects University City Blvd and Mallard Creek Church Rd on N Tryon St in Charlotte, North Carolina, was considered for simulation-based operational analysis. Vissim traffic simulation software was used to compute and compare delay, queue length, and maximum queue length at nine intersections to evaluate the influence of vehicles, LRT, pedestrians, and bicyclists, individually and/or combined. The statistical significance of variations in travel time reliability were particularly less in the case of links on N Tryon St with the Blue Line LRT extension. However, a decrease in travel time reliability on some links was observed on the parallel route (I-85) and cross-streets. While a decrease in vehicle delay on northbound and southbound approaches of N Tryon St was observed in most cases after the LRT is in operation, the cross-streets of N Tryon St incurred a relatively higher increase in delay after the LRT is in operation. The current pedestrian and bicycling activity levels seemed insignificant to have an influence on vehicle delay at intersections. The methodological approaches from this research can be used to assess the performance of a transportation facility and identify remedial solutions from a multimodal perspective.

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