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Littérature scientifique sur le sujet « Vertex flow »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Vertex flow"

Requerey, Iker S., Basilio Ruiz Cobo, Milan Gošić et Luis R. Bellot Rubio. « Persistent magnetic vortex flow at a supergranular vertex ». Astronomy & ; Astrophysics 610 (février 2018) : A84. http://dx.doi.org/10.1051/0004-6361/201731842.

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Context. Photospheric vortex flows are thought to play a key role in the evolution of magnetic fields. Recent studies show that these swirling motions are ubiquitous in the solar surface convection and occur in a wide range of temporal and spatial scales. Their interplay with magnetic fields is poorly characterized, however. Aims. We study the relation between a persistent photospheric vortex flow and the evolution of a network magnetic element at a supergranular vertex. Methods. We used long-duration sequences of continuum intensity images acquired with Hinode and the local correlation-tracking method to derive the horizontal photospheric flows. Supergranular cells are detected as large-scale divergence structures in the flow maps. At their vertices, and cospatial with network magnetic elements, the velocity flows converge on a central point. Results. One of these converging flows is observed as a vortex during the whole 24 h time series. It consists of three consecutive vortices that appear nearly at the same location. At their core, a network magnetic element is also detected. Its evolution is strongly correlated to that of the vortices. The magnetic feature is concentrated and evacuated when it is caught by the vortices and is weakened and fragmented after the whirls disappear. Conclusions. This evolutionary behavior supports the picture presented previously, where a small flux tube becomes stable when it is surrounded by a vortex flow.

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Hassin, Refael, et Asaf Levin. « Flow trees for vertex-capacitated networks ». Discrete Applied Mathematics 155, n^o 4 (février 2007) : 572–78. http://dx.doi.org/10.1016/j.dam.2006.08.012.

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Shahrokhi, Farhad, et László A. Székely. « On Canonical Concurrent Flows, Crossing Number and Graph Expansion ». Combinatorics, Probability and Computing 3, n^o 4 (décembre 1994) : 523–43. http://dx.doi.org/10.1017/s0963548300001383.

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We define and efficiently compute the canonical flow on a graph, which is a certain feasible solution for the concurrent flow problem and exhibits invariance under the action of the automorphism group of the graph. Using estimates for the congestion of our canonical flow, we derive lower bounds on the crossing number, bisection width, and the edge and vertex expansion of a graph in terms of sizes of the edge and vertex orbits and the average distance in the graph. We further exhibit classes of graphs for which our lower bounds are tight within a multiplicative constant. Also, in cartesian product graphs a concurrent flow is constructed in terms of the concurrent flows in the factors, and in this way lower bounds for the edge and vertex expansion of the power graphs are derived in terms of that of the original graph.

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MASOUMI, M., A. M. MOBASSERI et A. R. REZAEI. « MINIMUM FLOW VARIATION IN MAXIMUM FLOWS ». Discrete Mathematics, Algorithms and Applications 02, n^o 03 (septembre 2010) : 389–93. http://dx.doi.org/10.1142/s1793830910000735.

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Network flows are of growing interest in both applications and theory. Given a network flow with costs and arc capacities, the classical max flow-min cost problem is to send a given amount of flow from the source vertex to the sink vertex at least cost. Among the predominant issues in this field are problems that result when the flow is going through one arc to another arc in the same direction, such as the role of compressors in gas pipeline networks or the role of transformers in electricity wide networks. Hence, in order to minimize the cost of these elements in the network, we perform applications of line-digraphs in the form of an optimization algorithm. This paper proposes a new variant of the max flow-min cost problem. Our objective is to find the smoothest max flow over a given network.

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Bhandari, Phanindra Prasad, Shree Ram Khadka, Stefan Ruzika et Luca E. Schäfer. « Lexicographically Maximum Dynamic Flow with Vertex Capacities ». Journal of Mathematics and Statistics 16, n^o 1 (1 janvier 2020) : 142–47. http://dx.doi.org/10.3844/jmssp.2020.142.147.

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Laber, Rob, et Geoffrey Mason. « C-Graded vertex algebras and conformal flow ». Journal of Mathematical Physics 55, n^o 1 (janvier 2014) : 011705. http://dx.doi.org/10.1063/1.4862194.

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Khuller, Samir, et Joseph (Seffi) Naor. « Flow in planar graphs with vertex capacities ». Algorithmica 11, n^o 3 (mars 1994) : 200–225. http://dx.doi.org/10.1007/bf01240733.

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Antipov, Y. A., et V. V. Silvestrov. « Double cavity flow past a wedge ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 464, n^o 2099 (10 juillet 2008) : 3021–38. http://dx.doi.org/10.1098/rspa.2008.0136.

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A mathematical model of supercavitating flow past a wedge with sides of arbitrary length is proposed. The flow branches at a point on the lower side of the wedge. At the vertex of the wedge and at the ends of the wedge, the flow breaks away forming a nose bubble and a trailing cavity. The closure mechanism is described by the Tulin single-spiral-vortex model. The flow domain is mapped into a parametric plane cut along a unit segment. The conformal mapping function is reconstructed through the exact solution of two Riemann–Hilbert problems on a genus-zero Riemann surface. To complete the solution, one needs to determine five real parameters from a certain system of transcendental equations. Numerical results are presented for the case when a wedge can rotate about the vertex in the flow domain. In this case, the flow branches at the vertex and the number of the parameters to be determined is 3.

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Faria, Luerbio, André L. P. Guedes et Lilian Markenzon. « On feedback vertex set in reducible flow hypergraphs ». Procedia Computer Science 195 (2021) : 212–20. http://dx.doi.org/10.1016/j.procs.2021.11.027.

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D'APICE, CIRO, et BENEDETTO PICCOLI. « VERTEX FLOW MODELS FOR VEHICULAR TRAFFIC ON NETWORKS ». Mathematical Models and Methods in Applied Sciences 18, supp01 (août 2008) : 1299–315. http://dx.doi.org/10.1142/s0218202508003042.

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Some models of flow on a network are discussed. Assuming a macroscopic approach on each arc of the network, we consider a system of conservation laws and various possible choices to describe the evolution at vertices are discussed. A general framework proposed in recent literature is presented, then some new solutions for the scalar case are proposed and analyzed.

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Thèses sur le sujet "Vertex flow"

Chen, Xiaochen. « Tracking vertex flow on 3D dynamic facial models ». Diss., Online access via UMI:, 2008.

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Ekström, Sven-Erik. « A vertex-centered discontinuous Galerkin method for flow problems ». Licentiate thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-284321.

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The understanding of flow problems, and finding their solution, has been important for most of human history, from the design of aqueducts to boats and airplanes. The use of physical miniature models and wind tunnels were, and still are, useful tools for design, but with the development of computers, an increasingly large part of the design process is assisted by computational fluid dynamics (CFD). Many industrial CFD codes have their origins in the 1980s and 1990s, when the low order finite volume method (FVM) was prevalent. Discontinuous Galerkin methods (DGM) have, since the turn of the century, been seen as the successor of these methods, since it is potentially of arbitrarily high order. In its lowest order form DGM is equivalent to FVM. However, many existing codes are not compatible with standard DGM and would need a complete rewrite to obtain the advantages of the higher order. This thesis shows how to extend existing vertex-centered and edge-based FVM codes to higher order, using a special kind of DGM discretization, which is different from the standard cell-centered type. Two model problems are examined to show the necessary data structures that need to be constructed, the order of accuracy for the method, and the use of an hp-adaptation scheme to resolve a developing shock. Then the method is further developed to solve the steady Euler equations, within the existing industrial Edge code, using acceleration techniques such as local time stepping and multigrid. With the ever increasing need for more efficient and accurate solvers and algorithms in CFD, the modified DGM presented in this thesis could be used to help and accelerate the adoption of high order methods in industry.

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Guarino, Giuseppe. « Vehicular Traﬃc on Networks : Comparison among Solutions Modeling Vertex Flow ». Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2612.

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2015 - 2016
Nowadays, the analysis of issues associated with road traffic within urban and suburban areas has taken a leading role in trying to implement efficient plans of transport regulations by taking advantage of the available infrastructure. In fact, the occurrence frequency of slowdowns phenomena and strong congestions has greatly multiplied and caused a series of inconveniences and poor services for citizens such as the increased risk of accidents and air and noise pollution. In order to solve the problem of urban mobility, it is possible to act with a rational management of infrastructure and a road artery-planning program using simulators able to identify critical points in the design phase and evaluate the correctness of the proposed interventions. For this reason, it is important to use mathematical models to predict the evolution of the traffic starting from the knowledge of quantities such as cars’ densities at a given time instant. These models are classified into microscopic and macroscopic ones. The former analyze the behavior of each single vehicle, while the latter consider situations that arise from the interaction of many particles derived based on concepts of the fluid dynamics. The aim of the present research work is to review macroscopic fluid dynamic models dealing with traffic flow on road networks and to propose new solutions for the dynamics at intersections based on the integration of optimization criteria about the vehicular flow and rules for the distribution of traffic. In detail, the Thesis analyzes, describes and highlights the following topics and results:  physical variables that regulate road traffic and the relation that links them with each other, and some fluid dynamic macroscopic models for traffic on a single road (i.e. LWR, Payne Whitham, Aw-Rascle, Zhang, Third order and Multilane models);  vehicular traffic network based on the fluid dynamic model LWR and conservation laws, and characterized by some aspects to be solved like initial conditions on not infinite roads and dynamics at intersections. About the former aspect, the corresponding boundary value problems are presented and solved, while about the latter aspect the solution to Riemann Solver is given by considering also additional rules for traffic distribution that are well defined in new appropriate models simulating the presence of traffic lights at intersections with variable or fixed cycles of red-green;  numerical schemes used for the discretization of the conservation law and the solution of the dynamic at intersections. In detail, Godunov scheme, used for the determination of density values for road sections in different time instants starting from the initial density value of each road on the analyzed road network, is considered;  numerical results about an experimentation of some of the new models defined that are implemented within a road traffic simulator prototype by reproducing the behavior of vehicular densities on a road network with appropriate dynamics at intersections. These results are then compared in order to prove the correctness of each model, evaluate the performances and analyze some specific situations for optimization of car traffic. Considerations and results obtained in this research work by simulation of traffic flows may be useful as support for authorities responsible for urban road network in order to make an appropriate urban planning by evaluating the needs of the country. In fact, it could be possible to avoid traffic congestion at certain areas or time slots, bring down the rate of air pollution or noise and minimize risks due to overcrowding of vehicles on roads. [edited by author]
Oggigiorno, l'analisi delle problematiche legate al traffico stradale nelle aree urbane e suburbane ha avuto un ruolo di primo piano nel tentativo di attuare piani efficienti di regolamentazione dei trasporti sfruttando le infrastrutture disponibili. Infatti, la frequenza dei fenomeni di rallentamento e di congestione si è moltiplicata e ha causato una serie di inconvenienti e scarsi servizi per i cittadini, come l'aumento del rischio di incidenti e di inquinamento atmosferico ed acustico. Al fine di risolvere il problema della mobilità urbana, è possibile agire con una gestione razionale delle infrastrutture e un programma di pianificazione dell'arteria stradale utilizzando simulatori in grado di individuare punti critici nella fase di progettazione e valutare la correttezza degli interventi proposti. Per questo motivo, è importante utilizzare modelli matematici per prevedere l'evoluzione del traffico a partire dalla conoscenza di quantità come la densità di un veicolo in un dato istante di tempo. Tali modelli sono classificati in microscopici e macroscopici. I primi analizzano il comportamento di ogni singolo veicolo, mentre i secondi considerano situazioni che derivano dall'interazione di molte particelle derivate in base ai concetti della fluido-dinamica. Lo scopo del presente lavoro di ricerca è quello di analizzare i modelli fluido-dinamici macroscopici che trattano il flusso di traffico sulle reti stradali e di proporre nuove soluzioni per le dinamiche agli incroci basate sull'integrazione di criteri di ottimizzazione del flusso veicolare con regole di distribuzione del traffico. In dettaglio, la tesi analizza, descrive ed evidenzia i seguenti argomenti e risultati:  le variabili fisiche che regolano il traffico stradale e la relazione che le lega tra loro, ed alcuni modelli fluido-dinamici macroscopici per il traffico su singola strada (ovvero i modelli LWR, Payne-Whitham, Aw-Rascle, Zhang, Third order e Multilane);  la rete di traffico veicolare basata sul modello fluido-dinamico LWR e sulle leggi di conservazione e caratterizzata da alcuni aspetti da risolvere come le condizioni iniziali sulle strade non infinite e le dinamiche agli incroci. Per quanto riguarda il primo aspetto, vengono presentati e risolti i problemi di “condizione al bordo” corrispondenti, mentre per quanto riguarda il secondo aspetto viene presentata la soluzione al problema di Riemann considerando anche regole aggiuntive e ben definite per la distribuzione del traffico in nuovi modelli che simulano la presenza di semafori agli incroci con cicli variabili o fissi di rosso-verde;  gli schemi numerici per la discretizzazione della legge di conservazione e la soluzione alle dinamiche agli incroci. In dettaglio, viene considerate lo schema di Godunov, usato per determinare i valori di densità dei segmenti di strada in diversi istanti di tempo a partire dal valore di densità iniziale di ogni strada nella rete stradale analizzata;  i risultati numerici della sperimentazione di alcuni dei nuovi modelli definiti, che sono implementati all’interno di un prototipo di simulatore del traffico stradale riproducendo il comportamento delle densità dei veicoli nella rete stradale con appropriate dinamiche agli incroci. Tali risultati sono successivamente confrontati per provare la correttezza di ogni modello, valutare le prestazioni e analizzare alcune specifiche situazioni per ottimizzare il traffico stradale. I risultati e le considerazioni emerse dal presente lavoro di ricerca simulando flussi veicolari possono essere di aiuto alle autorità responsabili della rete stradale urbana per progettare un efficiente piano di viabilità valutando le reali necessità della città. Infatti, si potrebbero evitare congestioni di traffico in certe aree della città o in specifici intervalli temporali, diminuire sostanzialmente il tasso di inquinamento atmosferico o acustico e minimizzarne i rischi dovuti al sovraffollamento di veicoli lungo le strade. [a cura dell'autore]
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McBride, Diane. « Vertex-based discretisation methods for thermo-fluid flow in a finite volume-unstructured mesh context ». Thesis, University of Greenwich, 2003. http://gala.gre.ac.uk/6246/.

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The main aim of this research project is to investigate techniques to improve the resolution of flow variables on unstructured skewed meshes whilst working within a Finite Volume (FV) context. A three-dimensional vertex-based FV algorithm for the solution of thermo- fluid flow problems has been developed and integrated within a multi-physics FV framework PHYSICA. Currently PHYSICA employs a cell-centred discretisation technique for fluid mechanics problems and a vertex-based discretisation technique for solid mechanics problems. The vertex-based discretisation approach is validated for a variety of heat transfer problems and comparisons are made with cell-centred solutions. A coupled thermo-mechanical problem, including solidification and radiation, is simulated using vertex-based and cell-centred techniques. Results, run-time and memory requirements are compared. Hybrid vertex-based/cell-centred discretisation of the hydrodynamic variables is also investigated. The components of velocity are solved vertex-based with pressure cell-centred or conversely pressure is solved vertex-based with velocity cell-centred. The methods are applied to flow in a lid-driven cavity and solutions are obtained on a number of distorted meshes. Comparisons are made with the benchmark solutions. The hybrid discretisation enables solutions on distorted meshes where purely cell-centred techniques fail. The hybrid methods produce final solutions containing errors due to mesh distortion. The co-located vertex-based flow solutions obtained on the distorted meshes are comparable to solutions obtained on a uniform Cartesian mesh. Having a good resolution of the flow field on distorted meshes enables the solution of other transported variables using cell-centred techniques. Finally, this hybrid vertex-based/cell-centred technique is applied to thermally driven flow, turbulent flow, and three-dimensional flow over an aircraft wing.

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Seddiki, Sélim. « Contribution au développement du détecteur de Vertex de l'expérience CBM et étude de faisabilité des mesures du flot elliptique des particules à charme ouvert ». Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00862654.

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CBM, une des expériences majeures du nouvel accélérateur FAIR en cours de construction au GSI (Darmstadt), a pour objectif d'explorer le diagramme des phases de la matière nucléaire dans la région des hautes densités baryoniques nettes. Un de ses principaux thèmes de physique est l'étude de la production des particules à charme ouvert dans les collisions d'ions lourds. La mesure directe de ces particules nécessite l'utilisation d'un détecteur de vertex très précis. La présente thèse est une contribution à la conception et au développement de ce détecteur, appelé MVD. Une première partie de la thèse concerne l'évaluation, à l'aide de simulations réalistes, des flots de données à transmettre par les capteurs qui équiperont la première génération du MVD. Les résultats obtenus montrent que les performances attendues des capteurs permettront de mener à bien le programme de physique de CBM. Une deuxième partie porte sur les performances attendues pour la reconstruction des particules à charme ouvert, à travers leur désintégration hadronique, dans les collisions Au+Au. Des simulations détaillées ont permis de démontrer que la reconstruction du méson D+ → π+ π+ K-, par exemple, est faisable avec une efficacité de reconstruction de 2% et un rapport signal/bruit de 1.5. La statistique attendue en deux mois de prises de données a été évaluée à environ 6.9 x 104 mésons D. Dans la dernière partie, il a été montré que cette statistique permettrait d'effectuer des études détaillées du flot elliptique intégré des mésons D. La mesure du flot elliptique différentiel de ces particules requerrait, cependant, des statistiques plus élevées, et donc l'utilisation de capteurs plus performants.

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Ravikumar, Devaki. « 2D Compressible Viscous Flow Computations Using Acoustic Flux Vector Splitting (AFVS) Scheme ». Thesis, Indian Institute of Science, 2001. http://hdl.handle.net/2005/277.

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The present work deals with the extension of Acoustic Flux Vector Splitting (AFVS) scheme for the Compressible Viscous flow computations. Accurate viscous flow computations require much finer grids with adequate clustering of grid points in certain regions. Viscous flow computations are performed on unstructured triangulated grids. Solving Navier-Stokes equations involves the inviscid Euler part and the viscous part. The inviscid part of the fluxes are computed using the Acoustic Flux Vector Splitting scheme and the viscous part which is diffusive in nature does not require upwinding and is taken care using a central difference type of scheme. For these computations both the cell centered and the cell vertex finite volume methods are used. Higher order accuracy on unstructured meshes is achieved using the reconstruction procedure. Test cases are chosen in such a way that the performance of the scheme can be evaluated for different range of mach numbers. We demonstrate that higher order AFVS scheme in conjunction with a suitable grid adaptation strategy produce results that compare well with other well known schemes and the experimental data. An assessment of the relative performance of the AFVS scheme with the Roe scheme is also presented.

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Green, Steven. « Calorimetry at a future Linear Collider ». Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/269648.

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This thesis describes the optimisation of the calorimeter design for collider experiments at the future Compact Linear Collider (CLIC) and the International Linear Collider (ILC). The detector design of these experiments is built around high-granularity Particle Flow Calorimetry that, in contrast to traditional calorimetry, uses the energy measurements for charged particles from the tracking detectors. This can only be realised if calorimetric energy deposits from charged particles can be separated from those of neutral particles. This is made possible with fine granularity calorimeters and sophisticated pattern recognition software, which is provided by the PandoraPFA algorithm. This thesis presents results on Particle Flow calorimetry performance for a number of detector configurations. To obtain these results a new calibration procedure was developed and applied to the detector simulation and reconstruction to ensure optimal performance was achieved for each detector configuration considered. This thesis also describes the development of a software compensation technique that vastly improves the intrinsic energy resolution of a Particle Flow Calorimetry detector. This technique is implemented within the PandoraPFA framework and demonstrates the gains that can be made by fully exploiting the information provided by the fine granularity calorimeters envisaged at a future linear collider. A study of the sensitivity of the CLIC experiment to anomalous gauge couplings that {affect} vector boson scattering processes is presented. These anomalous couplings provide insight into possible beyond standard model physics. This study, which utilises the excellent jet energy resolution from Particle Flow Calorimetry, was performed at centre-of-mass energies of 1.4 TeV and 3 TeV with integrated luminosities of 1.5$\text{ab}^{-1}$ and 2$\text{ab}^{-1}$ respectively. The precision achievable at CLIC is shown to be approximately one to two orders of magnitude better than that currently offered by the LHC. In addition, a study into various technology options for the CLIC vertex detector is described.

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Rudgyard, Michael A. « Cell vertex methods for compressible gas flows ». Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279991.

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Vašek, Lubomír. « Trhání vodního sloupce pod OK vodní turbíny při nestacionárních stavech ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230024.

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In this diploma thesis called Water column separation under the hydraulic turbine runner during unsteady operating regimes are solved the pressure pulsations of the reverse water hamer. In the thesis is deduced a mathematical relationship of elaboration the numerice model which is based on equations of continuity and equations of forces equilibrium. Numerical model is created in MS Excel uses for computation the numerical method Lax-Wendrof that allows consideration of variable sound speed as function of static pressure and allows variable lenght step in computation domain. Reverse water hammer is in the thesis solved with consideration of rotating flow behind shut-off valve, where we expect forming of vortex rope. This situation can be applied on the closing water turbine which has vertex rope under turbine runner. Specifically for this thesis was carried out the experiment of the reverse water hammer. Constants going into numerical solution are optimalized with using experiment and pressure pulsation are compared between numerical solution and experiment.

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Håkansson, Jacob, et Isidora Vakaricic. « Produktionsflödesanalys - CA-Verken i Sävsjö ». Thesis, Växjö University, School of Technology and Design, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1536.

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Examensarbete utfördes på CA-Verken i Sävsjö som bl.a. tillverkar hydraulcylindrar. De senaste två år har CA-Verken haft en kraftig ökning av omsättningen och det som står i vägen för fortsatt expansion är produktionen som har begränsad kapacitet.

Målet med detta arbete är att studera CA-Verkens produktionsflöde för att kunna identifiera flaskhalsen/flaskhalsarna och därefter ge förslag på lösningar och förbättringar. Den teorin som har använts som grund till arbetet är Theory of Constraints (TOC). Intervjuer, företagets affärssystem och observationer har använts vid datainsamling. Genom analysering av produktionsflödet för cylindrar som står för den största delen av omsättningen identifierades monteringen som flaskhals.

För att kunna optimera produktionsflödet krävs det att monteringen utnyttjas effektivt samt att olika störningar och slöserier i monteringsprocessen elimineras.

This diplomawork is a study of the making of hydraulic cylinders at CA-Verken, a Swedish company located in Sävsjö. The last two years has showed a substantial increase of the company’s turnover. The only remaining obstacle of an ongoing expansion is the limited capacity of the company’s production.

The purpose of this diplomawork is, for that particular reason, to study CA-Verkens production flow in order to identify the bottleneck-issues and ultimately be able to suggest possible solutions and improvements concerning the production process.

The theoretic foundation of this study is based on the Theory of Constraints (TOC). Interviews, company business systems and observations have been used as important sources during the collection of data. By analysing the production flow concerning the cylinders, which represents the greatest deal of the company’s turnover, the assembly was identified as a bottleneck-issue.

In order to optimize the torrent of production it’s necessary for the company to increase the efficiency of the assembly and eliminate different disturbances as well as all unnecessary wastefulness in the process.

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Livres sur le sujet "Vertex flow"

Roe, P. L. Error estimates for cell-vertex solutions of the compressible Euler equations. Hampton, Va : ICASE, 1987.

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Konishi, Kukiko. Flop invariance of the topological vertex. Kyoto, Japan : Kyōto Daigaku Sūri Kaiseki Kenkyūjo, 2006.

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Elliptic genera and vertex operator super-algebras. Berlin : Springer, 1999.

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Playground poets : Let your creativity flow : Baby bards. Peterborough : Young Writers, 2006.

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Playground poets : Let your creativity flow : Scottish inspirations. Peterborough : Young Writers, 2006.

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Playground poets : Let your creativity flow : Inspirations from Hertfordshire. Peterborough : Young Writers, 2005.

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Playground poets : Let your creativity flow : Inspirations from Scotland. Peterborough : Young Writers, 2005.

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Ohriner, Mitchell. Flow. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190670412.001.0001.

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Originating in dance parties in the South Bronx in the late 1970s, hip hop and rap music have become a dominant style of popular music in the United States and a force for activism all over the world. So, too, has scholarship on this music grown, yet much of this scholarship, employing methods drawn from sociology and literature, leaves unaddressed the expressive musical choices made by hip-hop artists. This book addresses flow, the rhythm of the rapping voice. Flow presents theoretical and analytical challenges not encountered elsewhere. It is rhythmic as other music is rhythmic. But it is also rhythmic as speech and poetry are rhythmic. Key concepts related to rhythm, such as meter, periodicity, patterning, and accent, are treated independently in scholarship of music, poetry, and speech. This book reconciles those approaches, theorizing flow by integrating the methods of computational music analysis and humanistic close reading. Through the analysis of large collections of verses, it addresses questions in the theories of rhythm, meter, and groove in the unique ecology of rap music. Specifically, the work of Eminem clarifies how flow relates to text, the work of Black Thought clarifies how flow relates to other instrumental streams, and the work of Talib Kweli clarifies how flow relates to rap’s persistent meter. Although the focus throughout is rap music, the methods introduced are appropriate for other genres mix voices and more rigid metric frameworks and further extends the valuable work on hip hop from other perspectives in recent years.

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Garcia-Verdugo, Eduardo, et Santiago V. Luis. Flow Chemistry : Integrated Approaches for Practical Applications. Royal Society of Chemistry, The, 2019.

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Garcia-Verdugo, Eduardo, et Santiago V. Luis. Flow Chemistry : Integrated Approaches for Practical Applications. Royal Society of Chemistry, The, 2019.

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Chapitres de livres sur le sujet "Vertex flow"

Arsenis, Makis, et Robert Kleinberg. « Online Flow Computation on Unit-Vertex-Capacitated Networks ». Dans Symposium on Algorithmic Principles of Computer Systems, 120–32. Philadelphia, PA : Society for Industrial and Applied Mathematics, 2020. http://dx.doi.org/10.1137/1.9781611976021.9.

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Higashikawa, Yuya, Naoki Katoh et Junichi Teruyama. « Almost Linear Time Algorithms for Some Problems on Dynamic Flow Networks ». Dans Sublinear Computation Paradigm, 65–85. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4095-7_5.

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AbstractMotivated by evacuation planning, several problems regarding dynamic flow networks have been studied in recent years. A dynamic flow network consists of an undirected graph with positive edge lengths, positive edge capacities, and positive vertex weights. The road network in an area can be treated as a graph where the edge lengths are the distances along the roads and the vertex weights are the number of people at each site. An edge capacity limits the number of people that can enter the edge per unit time. In a dynamic flow network, when particular points on edges or vertices called sinks are given, all of the people are required to evacuate from the vertices to the sinks as quickly as possible. This chapter gives an overview of two of our recent results on the problem of locating multiple sinks in a dynamic flow path network such that the max/sum of evacuation times for all the people to sinks is minimized, and we focus on techniques that enable the problems to be solved in almost linear time.

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Kaplan, Haim, et Yahav Nussbaum. « Maximum Flow in Directed Planar Graphs with Vertex Capacities ». Dans Lecture Notes in Computer Science, 397–407. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04128-0_36.

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Forth, Shaun A., et Trevor P. Evans. « Aerofoil Optimisation via AD of a Multigrid Cell-Vertex Euler Flow Solver ». Dans Automatic Differentiation of Algorithms, 153–60. New York, NY : Springer New York, 2002. http://dx.doi.org/10.1007/978-1-4613-0075-5_17.

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Zhilyakova, Liudmila Yu. « Resource Network with Limitations on Vertex Capacities : A Double-Threshold Dynamic Flow Model ». Dans Communications in Computer and Information Science, 240–48. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00617-4_22.

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Fořt, J., J. Fürst, J. Halama, M. Hrušová et K. Kozel. « Comparisons of Cell Centered and Cell Vertex Finite Volume Methods for Internal Flow Problems ». Dans Hyperbolic Problems : Theory, Numerics, Applications, 325–32. Basel : Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8720-5_35.

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Salmond, Deborah J. « A cell-vertex multigrid scheme for solution of the Euler equations for transonic flow past a wing ». Dans Tenth International Conference on Numerical Methods in Fluid Dynamics, 549–53. Berlin, Heidelberg : Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/bfb0041848.

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Hall, Jason David. « The Automatic Flow of Verse ». Dans Nineteenth-Century Verse and Technology, 165–206. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53502-9_5.

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Brenner, Konstantin, Mayya Groza, Cindy Guichard et Roland Masson. « Vertex Approximate Gradient Scheme for Hybrid Dimensional Two-Phase Darcy Flows in Fractured Porous Media ». Dans Finite Volumes for Complex Applications VII-Elliptic, Parabolic and Hyperbolic Problems, 507–15. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05591-6_50.

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Wang, Yipu. « Maximum Integer Flows in Directed Planar Graphs with Vertex Capacities and Multiple Sources and Sinks ». Dans Proceedings of the Thirtieth Annual ACM-SIAM Symposium on Discrete Algorithms, 554–68. Philadelphia, PA : Society for Industrial and Applied Mathematics, 2019. http://dx.doi.org/10.1137/1.9781611975482.35.

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Actes de conférences sur le sujet "Vertex flow"

Wijayanto, Arie Wahyu, et Tsuyoshi Murata. « Flow-Aware Vertex Protection Strategy on Large Social Networks ». Dans ASONAM '17 : Advances in Social Networks Analysis and Mining 2017. New York, NY, USA : ACM, 2017. http://dx.doi.org/10.1145/3110025.3110033.

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Faruquee, Zakir, et Temitope V. Olatunji. « Steady and Unsteady Laminar Flow Past an Equilateral Triangular Cylinder for Two Different Orientations ». Dans ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37532.

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Unconfined fluid flow past an equilateral triangle was numerically studied for laminar incompressible flow. Two configurations of the cylinder were studied. In the first configuration; a vertex was placed upstream and a side was placed in the downstream position normal to the flow, while in the second configuration; the orientation of the triangle was reversed, i.e. the side normal to the flow was placed upstream and a vertex was placed at the downstream. Both steady and unsteady simulations were performed at 30 ≤ Re ≤ 150. The results clearly show that the orientation of the triangle with the vertex at the downstream side stabilized the flow and delayed the onset of vortex shedding. Significant differences of drag coefficient, wake length, and velocity distributions were found between the two orientations of the equilateral triangle.

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Seo, Minseok, Jaepil Ban et Sang Woo Kim. « Vertex-wise NLMS Algorithm for Signal Reconstruction of DC Power Flow ». Dans 2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2019. http://dx.doi.org/10.1109/appeec45492.2019.8994358.

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Carvalho, Cláudio, Jonas Costa, Raul Lopes, Ana Karolina Maia, Nicolas Nisse et Cláudia Linhares Sales. « Characterizing Networks Admitting k Arc-disjoint Branching Flows ». Dans Encontro de Teoria da Computação. Sociedade Brasileira de Computação - SBC, 2020. http://dx.doi.org/10.5753/etc.2020.11089.

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An s-branching flow f in a network N = (D,c) (where c is the capacity function) is a flow that reaches every vertex in V(D) \ {s} from s while loosing exactly one unit of flow in each vertex other than s. In other words, the difference between the flow entering a vertex v and a flow leaving a vertex v is one whenever v is different from s. It is known that the hardness of the problem of finding k arc-disjoint s-branching flows in network N is linked to the capacity c of the arcs in N: the problem is solvable in polynomial time if every arc has capacity n - l, for fixed l, and NP-complete in most other cases, with very few cases open. We further investigate a conjecture by Costa et al. from 2019 that aims to characterize networks admitting k arc-disjoint s-branching flows, generalizing a classical result by Edmonds that provides such characterization when all arcs have capacity n-1. We show that, in general, the conjecture is false. However, on the positive side, it holds for digraphs formed by out-branchings together with parallel arcs.

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SAMIER, Pierre. « Pressure Coupling for Geomechanical Multi-Phase Flow Simulation Using Vertex Centered Flow Elements and Unstructured Grids ». Dans SPE Reservoir Simulation Conference. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/182699-ms.

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Aipeng, Hao, et Jia Yuhong. « Numerical Investigation of Flow Control Using Vertex Generator for Landing Gear Noise Reduction ». Dans 22nd AIAA/CEAS Aeroacoustics Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-2773.

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Samier, P., et R. Masson. « Coupling Vertex Centered Based Flow Elements With Poromechanical Finite Elements Using Unstructured Grids ». Dans ECMOR XVI - 16th European Conference on the Mathematics of Oil Recovery. Netherlands : EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201802258.

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Sluchak, Vladimir. « The Thin Ring Wing as a Means of Flow Improvement Upstream a Propeller ». Dans SNAME 8th Propeller and Shafting Symposium. SNAME, 1997. http://dx.doi.org/10.5957/pss-1997-16.

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There are numerous devices currently known with the purpose to reduce the irregularity of the flow upstream the propeller and lo decrease by that means the propeller-induced vibration and noise. Many of these devices are wing-shaped vertex-generators that affect the flow with their induced (i.e. passive) longitudinal vertices. The subject of the paper is the use of a ring-shaped wing as a highly effective passive vertex-generator which allows lo control the flow closer to the most charged sections of · propeller blades. The problem of a thin ring-shaped wing with irregular ( asymmetric) geometry in the irregular steady flow has been solved in linear approach and the intensity of the induced longitudinal vertices as a junction of the irregularity of the flow and the geometry of the ring wing has been estimated using that solution. Experiments in the towing tank showing good concordance with the theoretical model confirmed the effectiveness of such a device. Some additional advantages of a ring-shaped wing incorporated into the construction of stabilizers are considered.

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Yuan, Chen, Guangyi Liu, Renchang Dai, Kewen Liu et Zhiwei Wang. « Power Flow Analysis Using Graph based Combination of Iterative Methods and Vertex Contraction Approach ». Dans 2018 International Conference on Power System Technology (POWERCON). IEEE, 2018. http://dx.doi.org/10.1109/powercon.2018.8601938.

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Haegland, Haakon, Ivar Aavatsmark et Roland Kaufmann. « Comparison of Vertex- and Cell-Centered Methods for Flow and Transport Simulation in 3D ». Dans SPE Reservoir Simulation Symposium. Society of Petroleum Engineers, 2013. http://dx.doi.org/10.2118/163593-ms.

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Rapports d'organisations sur le sujet "Vertex flow"

Haney, Jeanmarie, Dale Turner et Vashti Supplee. Ecological Implications of Verde River Flows. The Nature Conservancy, février 2008. http://dx.doi.org/10.3411/col.02091733.

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Mueller, C., S. J. Piercey, M. G. Babechuk et D. Copeland. Stratigraphy and lithogeochemistry of the Goldenville horizon and associated rocks, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328990.

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The Goldenville horizon in the Baie Verte Peninsula is an important stratigraphic horizon that hosts primary (Cambrian to Ordovician) exhalative magnetite and pyrite and was a chemical trap for younger (Silurian to Devonian) orogenic gold mineralization. The horizon is overlain by basaltic flows and volcaniclastic rocks, is intercalated with variably coloured argillites and cherts, and underlain by mafic volcaniclastic rocks; the entire stratigraphy is cut by younger fine-grained mafic dykes and coarser gabbro. Lithogeochemical signatures of the Goldenville horizon allow it to be divided into high-Fe iron formation (HIF; &gt;50% Fe2O3), low-Fe iron formation (LIF; 15-50% Fe2O3), and argillite with iron minerals (AIF; &lt;15% Fe2O3). These variably Fe-rich rocks have Fe-Ti-Mn-Al systematics consistent with element derivation from varying mineral contributions from hydrothermal venting and ambient detrital sedimentation. Post-Archean Australian Shale (PAAS)-normalized rare earth element (REE) signatures for the HIF samples have negative Ce anomalies and patterns similar to modern hydrothermal sediment deposited under oxygenated ocean conditions. The PAAS-normalized REE signatures of LIF samples have positive Ce anomalies, similar to hydrothermal sediment deposited under anoxic to sub-oxic conditions. The paradoxical Ce behaviour is potentially explained by the Mn geochemistry of the LIF samples. The LIF have elevated MnO contents (2.0-7.5 weight %), suggesting that Mn from hydrothermal fluids was oxidized in an oxygenated water column during hydrothermal venting, Mn-oxides then scavenged Ce from seawater, and these Mn-oxides were subsequently deposited in the hydrothermal sediment. The Mn-rich LIF samples with positive Ce anomalies are intercalated with HIF with negative Ce anomalies, both regionally and on a metre scale within drill holes. Thus, the LIF positive Ce anomaly signature may record extended and particle-specific scavenging rather than sub-oxic/redox-stratified marine conditions. Collectively, results suggest that the Cambro-Ordovician Taconic seaway along the Laurentian margin may have been completely or near-completely oxygenated at the time of Goldenville horizon deposition.

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Mueller, C., S. J. Piercey, M. G. Babechuk et D. Copeland. Stratigraphy and lithogeochemistry of rocks from the Nugget Pond Deposit area, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328989.

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Stratigraphic and lithogeochemical data were collected from selected drill core from the Nugget Pond gold deposit in the Betts Cove area, Newfoundland. The stratigraphy consists of a lower unit of basaltic rocks that are massive to pillowed (Mount Misery Formation). This is overlain by sedimentary rocks of the Scrape Point Formation that consist of lower unit of turbiditic siltstone and hematitic cherts/iron formations (the Nugget Pond member); the unit locally has a volcaniclastic rich-unit at its base and grades upwards into finer grained volcaniclastic/turbiditic rocks. This is capped by basaltic rocks of the Scrape Point Formation that contain pillowed and massive mafic flows that are distinctively plagioclase porphyritic to glomeroporphyritic. The mafic rocks of the Mount Misery Formation have island arc tholeiitic affinities, whereas Scrape Point Formation mafic rocks have normal mid-ocean ridge (N-MORB) to backarc basin basalt (BABB) affinities. One sample of the latter formation has a calc-alkalic affinity. All of these geochemical features are consistent with results and conclusions from previous workers in the area. Clastic sedimentary rocks and Fe-rich sedimentary rocks of the Scrape Point Formation have features consistent with derivation from local, juvenile sources (i.e., intra-basinal mafic rocks). The Scrape Point Formation sedimentary rocks with the highest Fe/Al ratios, inferred to have greatest amount of hydrothermally derived Fe, have positive Ce anomalies on Post-Archean Australian Shale (PAAS)-normalized trace element plots. These features are consistent with having formed via hydrothermal venting into an anoxic/ sub-oxic water column. Further work is needed to test whether these redox features are a localized feature (i.e., restricted basin) or a widespread feature of the late Cambrian-early Ordovician Iapetus Ocean, as well as to delineate the role that these Fe-rich sedimentary rocks have played in the localization of gold mineralization within the Nugget Pond deposit.

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Estimates of consumptive use and ground-water return flow using water budgets in Palo Verde Valley, California. US Geological Survey, 1987. http://dx.doi.org/10.3133/wri874070.

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