Bibliographies thématiques / TWO-PHASE EXPANSION

Littérature scientifique sur le sujet « TWO-PHASE EXPANSION »

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Publié le 10 mars 2023

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Articles de revues sur le sujet "TWO-PHASE EXPANSION"

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Kanno, Hiroshi, et Naoki Shikazono. « C143 Modeling of adiabatic efficiency and phase change in two-phase expansion ». Proceedings of the Thermal Engineering Conference 2015 (2015) : _C143–1_—_C143–2_. http://dx.doi.org/10.1299/jsmeted.2015._c143-1_.

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Hsieh, Chin-Lung, et Wei-Hsing Tuan. « Elastic and thermal expansion behavior of two-phase composites ». Materials Science and Engineering : A 425, no 1-2 (juin 2006) : 349–60. http://dx.doi.org/10.1016/j.msea.2006.03.073.

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Woodward*, John L. « Expansion zone modeling of two-phase and gas discharges ». Journal of Hazardous Materials 33, no 2 (février 1993) : 307–18. http://dx.doi.org/10.1016/0304-3894(93)85060-r.

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Wongwises, Somchai, et Somjin Disawas. « Performance of the two-phase ejector expansion refrigeration cycle ». International Journal of Heat and Mass Transfer 48, no 19-20 (septembre 2005) : 4282–86. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2005.04.017.

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HARADA, Atsushi, et Masafumi Nakagawa. « G501 Theoretical analysis of expansion fan in two-phase flow with phase-change ». Proceedings of the Fluids engineering conference 2009 (2009) : 575–76. http://dx.doi.org/10.1299/jsmefed.2009.575.

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MATSUMURA, Kazuhiko, Yasuhiko FUJII, Shigeo KIMURA et Takahiro KIWATA. « Two-Phase Flow Visualization in the throttle of expansion valve ». Journal of the Visualization Society of Japan 27, Supplement1 (2007) : 123–24. http://dx.doi.org/10.3154/jvs.27.supplement1_123.

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KIM, WONTAE, et EDWIN J. SON. « TWO NONCOMMUTATIVE PARAMETERS AND REGULAR COSMOLOGICAL PHASE TRANSITION IN THE SEMICLASSICAL DILATON COSMOLOGY ». Modern Physics Letters A 23, no 15 (20 mai 2008) : 1079–91. http://dx.doi.org/10.1142/s0217732308027047.

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We study cosmological phase transitions from modified equations of motion by introducing two noncommutative parameters in the Poisson brackets, which describes the initial- and future-singularity-free phase transition in the soluble semiclassical dilaton gravity with a nonvanishing cosmological constant. Accelerated expansion and decelerated expansion appear alternatively, where the model contains the second accelerated expansion. The final stage of the universe approaches the flat spacetime independent of the initial state of the curvature scalar as long as the product of the two noncommutative parameters is less than one. Finally, we show that the initial-singularity-free condition is related to the second accelerated expansion of the universe.
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SETA, TAKESHI, KOJI KONO et SHIYI CHEN. « LATTICE BOLTZMANN METHOD FOR TWO-PHASE FLOWS ». International Journal of Modern Physics B 17, no 01n02 (20 janvier 2003) : 169–72. http://dx.doi.org/10.1142/s021797920301728x.

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A lattice Boltzmann method (LBM) for two-phase nonideal fluid flows is proposed based on a particle velocity-dependent forcing scheme. The resulting macroscopic dynamics via the Chapman-Enskog expansion recover the full set of thermohydrodynamic equations for nonideal fluids. Numerical verification of fundamental properties of thermal fluids, including thermal conductivity and surface tension, agrees well with theoretical predictions. Direct numerical simulations of two-phase phenomena, including phase-transition, bubble deformation and droplet falling and bubble rising under gravity are carried out, demonstrating the applicability of the model.
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Kanno, Hiroshi, et Naoki Shikazono. « E125 Modeling Study on Adiabatic Two-phase Expansion in a Cylinder ». Proceedings of the Thermal Engineering Conference 2014 (2014) : _E125–1_—_E125–2_. http://dx.doi.org/10.1299/jsmeted.2014._e125-1_.

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FUJII, Yasuhiko, Shigeo KIMURA, Takayuki SAITO, Takahiro KIWATA et Kazuhiko MATSUMURA. « 612 Two-phase Flow Visualization of Refrigerant Fluid at Expansion Valve ». Proceedings of the Fluids engineering conference 2005 (2005) : 86. http://dx.doi.org/10.1299/jsmefed.2005.86.

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Thèses sur le sujet "TWO-PHASE EXPANSION"

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Harmon, Connor. « Tucson Streetcar Phase Two Expansion ». The University of Arizona, 2016. http://hdl.handle.net/10150/608579.

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Sustainable Built Environments Senior Capstone Project
In a society growing towards alternative modes of transportation, this study explores the phase 2 streetcar expansion for the Tucson area. Using case studies and research articles, a criteria of factors were created to best judge three predetermined expansion routes. A case study was then done on these routes to determine which route would be best for the area. In this study, the factors that were looked at and used to rank the three routes included; population density and average annual income of the surrounding area of the route (400 meter buffer), accessibility and connectivity, which includes; bus stops, bike lanes, walkability, traffic counts and possible park & ride development. The last factor used in the case study was proximity to destination, specifically how many ‘big destinations’ (destinations that experience high volumes of people) each route had. The proximity to destination factor also determined how good of a balance each route had with housing, work and amenities/leisure destinations.
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Yusoff, Nazrul Hizam. « Stratifying of liquid-liquid two phase flows through sudden expansion ». Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12939/.

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The transport and separation of oil and water is an essential process to the oil and chemical industries. Although transporting the mixtures is often necessary due to few reasons, it is generally beneficial to separate out the phases in order to reduce installation and maintenance costs, at the same time, avoiding safety problems. Thus, separation of liquid-liquid flows is a necessary part of many industrial processes. Hence, knowledge of two-phase flow dynamics is important for the design optimisation of separators. Therefore, the aim of this research is to investigate the feasibility of a sudden pipe expansion to be used as phase separator because it compact in design and capable for converting dispersed flow to stratified flow. In the test section, spatial distribution of the liquid-liquid phases in a dynamics flow system was visualised for the first time for by means of capacitance Wire Mesh Sensor (CapWMS), providing instantaneous information about the interface shapes, waves and phase layer evolution of oil-water flow. Visual assessment and analysis of the WMS data showed three distinct layers: an oil layer at the pipe top; a water layer at the pipe bottom and a mixed layer between them. The interfaces that form between the separated phases (oil or water) and the mixed layer were classified as oil interface or water interface. Results showed interface shapes were initially concave or convex near to the inlet of the test section and became flat further downstream the expansion, especially for water interfaces. There were no waves observed for horizontal and downward pipe orientations at all flow conditions and axial position downstream of the expansion. As for the upward inclined pipe orientation, waves were found, and they formed at position close to the inlet at all input oil volume fraction except at 0.2 OVF. The amplitude of the waves was: ~ 0.29D for 0.8 OVF; ~ 0.22D for 0.6 OVF and ~ 0.26D for 0.4 OVF. The higher the input oil volume fraction, the larger the waves become. In conclusion, the WMS results demonstrated that spatial distributions are strongly dependent on the mixture velocity, input oil fraction and inclination angles for the far position. In this present work, droplets were found to be larger near the interface. Drops were large nearer to the interface at the near position (10D) for all pipe orientations and throughout the test section for horizontal flow. The drops size decreased when the distance from the interface increased for these pipe configurations. As for the furthest position from the expansion for upward and downward inclined pipe orientation, larger droplets could also be seen at distance away from the interface and vice versa. The gravity or buoyant force is one of the contributing factors to the settling of the droplets. These forces are acting simultaneously on the droplets i.e. if the buoyant force which tends to spread the droplets throughout the pipe cross-section, is not large enough to overcome the settling tendency of gravity settling of the droplets occurs. Hence, the droplets that are non-uniformly scattered within the continuous phase begin to coalesce as they flow further downstream the pipe, producing larger drops. In addition, as the distance from expansion increased, the mixed layer becomes narrow and more drops begin to coalescence to form large drop due to increased droplet-droplet collision. Owing to these factors, results indicate that the mechanisms of coalescence occurred faster at the bottom, for water droplets and at the top, for oil droplets than the other locations in a pipe cross-section. For a better separation design, the coalescence process should occur at the aforementioned (bottom for water and top for oil) locations within the expansion pipe. However, at higher mixture velocities the mixed layer would be responsible for the smaller droplet size for horizontal and both inclinations of pipe orientation. The mixed layer dominated almost entirely in the pipe cross-section.
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Kanu, Elizabeth. « Expansion driven Unstable Two Phase Flows in Long Risers and Wells ». Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14420.

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Flow instabilities in long wells and risers under certain flow conditions, is well known. Expansion driven flow instability (EDI) which is relatively little known, refers to occurrence of flow instabilities in long wells and risers as a result of entrapment of gas upstream of the well or riser base. EDI can also occur in gas-lift systems at low pressure and low gas injection rate.This work was initiated to tackle flow instability problem related to deep water production operations where long wells and risers are extensively in use. The aim of this thesis is to investigate a type of flow instability known as “Expansion Driven Flow Instability (EDI) in Long Wells and Risers”. This involves experimental investigation as well numerical modelling of expansion driven flow instability in long wells and risers. Finally results of the experimental investigations are compared with numerical model data.An experimental flow loop was setup to verify EDI at varying pipe geometry, inlet flow pressure and gas flow rate to examine the effect of EDI in long wells and risers. The laboratory experiment was conducted using air and water at atmospheric conditions, in a flowline-riser system consisting of a 32mm diameter and 9.12m long riser. The expansion driven flow cycle was captured in video recording.Variation of inlet flow pressures was achieved by varying the height of the overflow tank. Three cases were considered, each at a different inlet pressure. Each inlet pressure of the fluid was examined against varying inclination angles of the horizontal pipe to the riser inlet. Different gas flow rates were tested at different inclination angles. It was observed that inclination angle has the greatest impact on EDI.Experimental result of one of the cases was modelled using OLGA and the results of the experimental compared against simulation results output. Discrepancies in the two sets of results were observed in some cases. These may be attributed to simplifications and assumptions made during the simulation model build.Both results of the experimental investigation and numerical simulation demonstrated that expansion driven flow instability can occur in laboratory setup and can probably occur in deep water natural-lift wells and risers as well as gas-lifted wells and risers under certain flow conditions and pipe inclinations. 
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Roman, Abdeel J. « Studies of Horizontal Two-Phase Flow Using Electrical Capacitance Tomography and R-134a ». University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1510840347116138.

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Cronin, Joseph M. « Exploring Capabilities of Electrical Capacitance Tomography Sensor & ; Velocity Analysis of Two-Phase R-134a Flow Through a Sudden Expansion ». University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1495541577975687.

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Agarwal, Akhil. « Heat Transfer and Pressure Drop During Condensation of Refrigerants in Microchannels ». Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14129.

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Two-phase flow, boiling, and condensation in microchannels have received considerable attention in the recent past due to the growing interest in the high heat fluxes made possible by these channels. This dissertation presents a study on the condensation of refrigerant R134a in small hydraulic diameter (100 < Dh < 160 mm) channels. A novel technique is used for the measurement of local condensation heat transfer coefficients in small quality increments, which has typically been found to be difficult due to the low heat transfer rates at the small flow rates in these microchannels. This method is used to accurately determine pressure drop and heat transfer coefficients for mass fluxes between 300 and 800 kg/m2-s and quality 0 < x < 1 at four different saturation temperatures between 30 and 60oC. The results obtained from this study capture the effect of variations in mass flux, quality, saturation temperature, hydraulic diameter, and channel aspect ratio on the observed pressure drop and heat transfer coefficients. Based on the available flow regime maps, it was assumed that either the intermittent or annular flow regimes prevail in these channels for the flow conditions under consideration. Internally consistent pressure drop and heat transfer models are proposed taking into account the effect of mass flux, quality, saturation temperature, hydraulic diameter, and channel aspect ratio. The proposed models predict 95% and 94% of the pressure drop and heat transfer data within ±25%, respectively. Both pressure drop and heat transfer coefficient increase with a decrease in hydraulic diameter, increase in channel aspect ratio and decrease in saturation temperature. A new non-dimensional parameter termed Annular Flow Factor is also introduced to quantify the predominance of intermittent or annular flow in the channels as the geometric parameters and operating conditions change. This study leads to a comprehensive understanding of condensation in microchannels for use in high-flux heat transfer applications.
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Chalfi, Toufik Yacine. « Pressure loss associated with flow area change in micro-channels ». Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24725.

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Guo, Longkai. « Numerical investigation of Taylor bubble and development of phase change model ». Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI095.

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Le mouvement d'une bulle d'azote de Taylor dans des solutions mixtes glycérol-eau s'élevant à travers différents types d'expansions et de contractions est étudié par une approche numérique. La procédure CFD est basée sur un solveur open-source Basilisk, qui adopte la méthode du volume de fluide (VOF) pour capturer l'interface gaz-liquide. Les résultats des expansions/contractions soudaines sont comparés aux résultats expérimentaux. Les résultats montrent que les simulations sont en bon accord avec les expériences. La vitesse de la bulle augmente dans les expansions soudaines et diminue dans les contractions soudaines. Le modèle de rupture des bulles est observé dans les expansions soudaines avec de grands taux d'expansion, et un modèle de blocage des bulles est observé dans les contractions soudaines avec de petits rapports de contraction. De plus, la contrainte de cisaillement de la paroi, l'épaisseur du film liquide et la pression dans les simulations sont étudiées pour comprendre l'hydrodynamique de la bulle de Taylor montant par expansions/contractions. Le processus transitoire de la bulle de Taylor passant par une expansion/contraction soudaine est ensuite analysé pour trois singularités différentes: graduelle, parabolique convexe et parabolique concave. Une caractéristique unique de la contraction concave parabolique est que la bulle de Taylor passe par la contraction même pour de petits rapports de contraction. De plus, un modèle de changement de phase est développé dans le solveur Basilisk. Afin d'utiliser la méthode VOF géométrique existante dans Basilisk, une méthode VOF géométrique générale en deux étapes est implémentée. Le flux de masse n'est pas calculé dans les cellules interfaciales mais transféré aux cellules voisines autour de l'interface. La condition aux limites de température saturée est imposée à l'interface par une méthode de cellule fantôme. Le modèle de changement de phase est validé par évaporation de gouttelettes avec un taux de transfert de masse constant, le problème de Stefan unidimensionnel, le problème d'aspiration de l'interface et un cas d'ébullition à film plan. Les résultats montrent un bon accord avec les solutions analytiques ou les corrélations
The motion of a nitrogen Taylor bubble in glycerol-water mixed solutions rising through different types of expansions and contractions is investigated by a numerical approach. The CFD procedure is based on an open-source solver Basilisk, which adopts the volume-of-fluid (VOF) method to capture the gas-liquid interface. The results of sudden expansions/contractions are compared with experimental results. The results show that the simulations are in good agreement with experiments. The bubble velocity increases in sudden expansions and decreases in sudden contractions. The bubble break-up pattern is observed in sudden expansions with large expansion ratios, and a bubble blocking pattern is found in sudden contractions with small contraction ratios. In addition, the wall shear stress, the liquid film thickness, and pressure in the simulations are studied to understand the hydrodynamics of the Taylor bubble rising through expansions/contractions. The transient process of the Taylor bubble passing through sudden expansion/contraction is further analyzed for three different singularities: gradual, parabolic convex and parabolic concave. A unique feature in parabolic concave contraction is that the Taylor bubble passes through the contraction even for small contraction ratios. Moreover, a phase change model is developed in the Basilisk solver. In order to use the existed geometric VOF method in Basilisk, a general two-step geometric VOF method is implemented. Mass flux is calculated not in the interfacial cells but transferred to the neighboring cells around the interface. The saturated temperature boundary condition is imposed at the interface by a ghost cell method. The phase change model is validated by droplet evaporation with a constant mass transfer rate, the one-dimensional Stefan problem, the sucking interface problem, and a planar film boiling case. The results show good agreement with analytical solutions or correlations
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Yang, Limin. « Liquid-liquid two-phase flows at T-junctions and through expansions ». Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404047.

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Ninahuanca, Hans Maldonado. « Caracterização do escoamento na câmara de expansão de um separador ciclônico ». Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1145.

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PETROBRAS
O presente trabalho aborda o estudo do escoamento líquido-gás na câmara de expansão típica de um separador ciclônico cilíndrico. Para entender o funcionamento do separador, analisa-se primeiro, o campo de velocidades da fase líquida dentro do equipamento. A análise é realizada em função de simulações numéricas e medições experimentais. Em função dos resultados é desenvolvido um modelo para o cálculo da velocidade e a espessura do escoamento de líquido ao longo do separador. O modelo desenvolvido apresenta resultados com boa precisão para uma ampla faixa de condições de operação e dimensões do separador. Na segunda etapa, uma formulação para o seguimento de bolhas é acoplada no modelo monofásico, com a finalidade de avaliar, de modo teórico, a separação de bolhas de um meio líquido contínuo. O estudo de escoamento bifásico permite identificar o comprimento ótimo do separador para garantir a separação das bolhas e também permite entender a influência das condições de operação sobre o processo de separação. Os resultados alcançados devem contribuir para o estado da arte no assunto e fornecer a engenheiros que atuam na área uma ferramenta relativamente simples para o dimensionamento desse tipo de separadores.
This work approaches the study of gas-liquid flow in the expansion chamber of a typical cylindrical cyclonic separator. To understand its operation, first is analyzed the velocity field of the liquid phase inside the equipment. The analysis is based on numerical simulations and experimental measurements. From the results, is developed a model that determines the velocity and the thickness of the liquid film flow along the separator. The model developed produces results with good accuracy for a wide range of operating conditions and dimensions of the separator. In the second step, a formulation for bubble tracking is coupled in the single phase model, in order to evaluate its theoretical separation from a continuous liquid medium. The study of two-phase flow identifies the optimum length of the separator to separate bubbles and also allows understand the influence of operating conditions on the separation process. The results achieved should contribute to the state of the art in the subject and provide engineers working in the area a relatively simple tool for the design of these separators.
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Livres sur le sujet "TWO-PHASE EXPANSION"

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Morawetz, Klaus. Approximations for the Selfenergy. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0010.

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The systematic expansion of the selfenergy is presented with the help of the closure relation of chapter 7. Besides Hartree–Fock leading to meanfield kinetic equations, the random phase approximation (RPA) is shown to result into the Lennard–Balescu kinetic equation, and the ladder approximation into the Beth–Uehling–Uhlenbeck kinetic equation. The deficiencies of the ladder approximation are explored compared to the exact T-matrix by missing maximally crossed diagrams. The T-matrix provides the Bethe–Salpeter equation for the two-particle correlation functions. Vertex corrections to the RPA are presented. For a two-dimensional example, the selfenergy and effective mass are calculated. The structure factor and the pair-correlation function are introduced and calculated for various approximations.
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Mueller, Charles C. Traditional Agriculture and Land Distribution in Brazil. Sous la direction de Edmund Amann, Carlos R. Azzoni et Werner Baer. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780190499983.013.14.

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This chapter examines the progression of Brazil’s agriculture since the end of World War II, a period during which a highly concentrated pattern of land distribution remained basically unchanged, despite remarkable changes in agriculture. Three different phases are recognized: a phase of horizontal expansion, up to the early 1970s, in which agriculture remained essentially traditional; a period of substantial but conservative modernization of agriculture, from the early 1970s to the late 1990s; and a phase of consolidation of modernization. It highlights the development of two key elements: a modern segment, usually composed of large farm units; and “traditional agriculture,” constituted mainly of small farms. The chapter discusses their contributions to growing commodity exports and to the supply of food for domestic markets. The chapter concludes by examining events—affecting both the large-scale agriculture and small farm units—that led to the maintenance of the concentrated pattern of land tenure.
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Iliopoulos, John. A Brief History of Cosmology. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198805175.003.0002.

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We present the evolution of our ideas concerning the history of the Cosmos. They are based on Einstein’s theory of General Relativity in which E.P. Hubble and G. Lemaître brought two fundamental new concepts: the expansion of the Universe and the model of the Big Bang. They form the basic elements of the modern theory of Cosmology. We present very briefly the observational evidence which corroborates this picture based on a vast amount of data, among which the most recent ones come from the Planck mission with a detailed measurement of the cosmic microwave background (CMB) radiation. We show that during its evolution the Universe went through several phase transitions giving rise to the formation of particles, atoms, nuclei, etc. A particular phase transition, which occurred very early in the cosmic history, around 10–12 seconds after the Big Bang, is the Brout–Englert–Higgs (BEH) transition during which a fraction of the energy was transformed into mass, thus making it possible for most elementary particles to become massive.
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Ritzinger, Justin R. A New Cult for New Buddhists. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190491161.003.0004.

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This chapter examines the development of the “Maitreya School” from the eve of its founding to its peak of activity in 1937. This occurred in two phases. In the first, the school was closely associated with Yogācāra and served as the “house cult” of Taixu’s seminaries, forming an important part of the educational and ritual lives of these institutions. In the second phase, the school came to be seen in more expansive terms as an all-inclusive teaching and pure land elements overshadow Yogācāra. In this phase, active propagation grew and Taixu’s students and associates began to assume a more prominent role. Liturgies were composed, lay associations were organized, and the landscape was inscribed with the cult.
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Hall, Ryan. Beneath the Backbone of the World. University of North Carolina Press, 2020. http://dx.doi.org/10.5149/northcarolina/9781469655154.001.0001.

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For the better part of two centuries, between 1720 and 1877, the Blackfoot (Niitsitapi) people controlled a vast region of what is now the U.S. and Canadian Great Plains. As one of the most expansive and powerful Indigenous groups on the continent, they dominated the northern imperial borderlands of North America. The Blackfoot maintained their control even as their homeland became the site of intense competition between white fur traders, frequent warfare between Indigenous nations, and profound ecological transformation. In an era of violent and wrenching change, Blackfoot people relied on their mastery of their homelands’ unique geography to maintain their way of life. With extensive archival research from both the United States and Canada, Ryan Hall shows for the first time how the Blackfoot used their borderlands position to create one of North America’s most vibrant and lasting Indigenous homelands. This book sheds light on a phase of Native and settler relations that is often elided in conventional interpretations of Western history, and demonstrates how the Blackfoot exercised significant power, resiliency, and persistence in the face of colonial change.
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Fox, Raymond. The Use of Self. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780190616144.001.0001.

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This monograph presents recent advances in neural network (NN) approaches and applications to chemical reaction dynamics. Topics covered include: (i) the development of ab initio potential-energy surfaces (PES) for complex multichannel systems using modified novelty sampling and feedforward NNs; (ii) methods for sampling the configuration space of critical importance, such as trajectory and novelty sampling methods and gradient fitting methods; (iii) parametrization of interatomic potential functions using a genetic algorithm accelerated with a NN; (iv) parametrization of analytic interatomic potential functions using NNs; (v) self-starting methods for obtaining analytic PES from ab inito electronic structure calculations using direct dynamics; (vi) development of a novel method, namely, combined function derivative approximation (CFDA) for simultaneous fitting of a PES and its corresponding force fields using feedforward neural networks; (vii) development of generalized PES using many-body expansions, NNs, and moiety energy approximations; (viii) NN methods for data analysis, reaction probabilities, and statistical error reduction in chemical reaction dynamics; (ix) accurate prediction of higher-level electronic structure energies (e.g. MP4 or higher) for large databases using NNs, lower-level (Hartree-Fock) energies, and small subsets of the higher-energy database; and finally (x) illustrative examples of NN applications to chemical reaction dynamics of increasing complexity starting from simple near equilibrium structures (vibrational state studies) to more complex non-adiabatic reactions. The monograph is prepared by an interdisciplinary group of researchers working as a team for nearly two decades at Oklahoma State University, Stillwater, OK with expertise in gas phase reaction dynamics; neural networks; various aspects of MD and Monte Carlo (MC) simulations of nanometric cutting, tribology, and material properties at nanoscale; scaling laws from atomistic to continuum; and neural networks applications to chemical reaction dynamics. It is anticipated that this emerging field of NN in chemical reaction dynamics will play an increasingly important role in MD, MC, and quantum mechanical studies in the years to come.
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Raff, Lionel, Ranga Komanduri, Martin Hagan et Satish Bukkapatnam. Neural Networks in Chemical Reaction Dynamics. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199765652.001.0001.

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This monograph presents recent advances in neural network (NN) approaches and applications to chemical reaction dynamics. Topics covered include: (i) the development of ab initio potential-energy surfaces (PES) for complex multichannel systems using modified novelty sampling and feedforward NNs; (ii) methods for sampling the configuration space of critical importance, such as trajectory and novelty sampling methods and gradient fitting methods; (iii) parametrization of interatomic potential functions using a genetic algorithm accelerated with a NN; (iv) parametrization of analytic interatomic potential functions using NNs; (v) self-starting methods for obtaining analytic PES from ab inito electronic structure calculations using direct dynamics; (vi) development of a novel method, namely, combined function derivative approximation (CFDA) for simultaneous fitting of a PES and its corresponding force fields using feedforward neural networks; (vii) development of generalized PES using many-body expansions, NNs, and moiety energy approximations; (viii) NN methods for data analysis, reaction probabilities, and statistical error reduction in chemical reaction dynamics; (ix) accurate prediction of higher-level electronic structure energies (e.g. MP4 or higher) for large databases using NNs, lower-level (Hartree-Fock) energies, and small subsets of the higher-energy database; and finally (x) illustrative examples of NN applications to chemical reaction dynamics of increasing complexity starting from simple near equilibrium structures (vibrational state studies) to more complex non-adiabatic reactions. The monograph is prepared by an interdisciplinary group of researchers working as a team for nearly two decades at Oklahoma State University, Stillwater, OK with expertise in gas phase reaction dynamics; neural networks; various aspects of MD and Monte Carlo (MC) simulations of nanometric cutting, tribology, and material properties at nanoscale; scaling laws from atomistic to continuum; and neural networks applications to chemical reaction dynamics. It is anticipated that this emerging field of NN in chemical reaction dynamics will play an increasingly important role in MD, MC, and quantum mechanical studies in the years to come.
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Chapitres de livres sur le sujet "TWO-PHASE EXPANSION"

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Kou, Yue, Xiang Li, Shuo Feng, Derong Shen et Tiezheng Nie. « A Cross-Network User Identification Model Based on Two-Phase Expansion ». Dans Web Information Systems and Applications, 397–403. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30952-7_39.

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Maiti, Samit Bikas, Nirjhar Bar et Sudip Kumar Das. « Bed Expansion in Two-Phase Liquid–Solid Fluidized Beds with Non-Newtonian Fluids and ANN Modelling ». Dans Advances in Intelligent Systems and Computing, 33–45. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2188-1_3.

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White, Martin T. « Investigating the Validity of the Fundamental Derivative in the Equilibrium and Non-equilibrium Two-Phase Expansion of MM ». Dans Proceedings of the 3rd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power, 3–11. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69306-0_1.

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Volkov, Alexey N., et Gerard M. O’Connor. « Parallel Direct Simulation Monte Carlo of Two-Phase Gas-Droplet Laser Plume Expansion from the Bottom of a Cylindrical Cavity into an Ambient Gas ». Dans Computational Fluid Dynamics 2010, 105–12. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_11.

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Forciniti, Daniel, et Carol k. Hall. « Theoretical Treatment of Aqueous Two-Phase Extraction by Using Virial Expansions ». Dans ACS Symposium Series, 53–70. Washington, DC : American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0419.ch003.

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Chichaibelu, Bezawit Beyene, Maksud Bekchanov, Joachim von Braun et Maximo Torero. « The Global Cost of Reaching a World Without Hunger : Investment Costs and Policy Action Opportunities ». Dans Science and Innovations for Food Systems Transformation, 625–60. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15703-5_34.

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AbstractThis study developed a marginal abatement cost curve (MACC) to identify a mix of least-cost investment options with the highest potential for hunger reduction, hunger here defined by the undernourishment concept of the Food and Agriculture Organization (FAO). Twenty-two different interventions are considered for reducing undernourishment relying on information drawn from best available evidence-based literature, including model- and large-scale intervention studies. Ending hunger by 2030 would require annual investments of about US$ 39 to 50 billion until 2030 to lift about 840 to 909 million people out of hunger, which is the 2020 estimate of hunger projection in 2030, also considering the effects of COVID-19. Investing in agricultural R&D, agricultural extension services, information and communication technologies (ICT) – agricultural information systems, small-scale irrigation expansion in Africa and female literacy improvement are low cost options that have a relatively large hunger reduction potential. To achieve the goal of ending hunger by 2030, not only is it urgent not to lose any more time, but also to optimally phase investments. Investments that have more long-term impacts should be frontloaded in the decade in order to reap their benefits soon before 2030. A balanced approach is needed to reach the hungry soon – including those adversely affected by COVID-19 with social protection and nutrition programs.
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Smith, I. K. « Total flow and other systems involving two-phase expansion ». Dans Geothermal Power Generation, 321–51. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-08-100337-4.00012-7.

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Founti, M., et A. Klipfel. « Measurements and predictions in vertical, two-phase sudden expansion flows ». Dans Engineering Turbulence Modelling and Experiments, 979–90. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-444-89802-9.50095-2.

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Founti, M., et A. Klipfel. « Experimental and computational investigations of nearly dense two-phase sudden expansion flows ». Dans Engineering Turbulence Modelling and Experiments, 839–49. Elsevier, 1996. http://dx.doi.org/10.1016/b978-0-444-82463-9.50086-1.

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Youn Chen, Ing, Chih-Yung Tseng et Chi-Chuan Wang. « Two-Phase Flow Pressure Change Across Sudden Contraction and Expansion in Small Channels ». Dans Advances in Multiphase Flow and Heat Transfer (Volume 3), 55–83. BENTHAM SCIENCE PUBLISHERS, 2012. http://dx.doi.org/10.2174/978160805228811201010055.

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Actes de conférences sur le sujet "TWO-PHASE EXPANSION"

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Terenzi, Alessandro. « Expansion Waves in Two-Phase Pipelines ». Dans 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10004.

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The analysis of the expansion wave propagation generated by full-bore ruptures of pressurized pipelines containing compressible fluids must be carried out during the assessment of the possible use of crack arrestors. If the internal fluid is two-phase, the sound velocity dependence from the local void fraction and flow regime has to be taken into account, by considering that it may be much lower than for single phase gases, thus promoting crack propagation. In this paper a model for the simulation of an expansion wave in a two-phase fluid pipeline is presented; this model includes several possible descriptions of the thermodynamics and flow regimes, ranging from the simpler homogeneous equilibrium approach to the non-equilibrium slip flow evaluation. The sound velocity trend inside a rarefaction wave can give rise to particular phenomena as curve inversions and jumps. The impact of different formulations on the expansion wave calculation is discussed, giving hints for the design of the pipelines under consideration.
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Nakajima, N. « Two-Dimensional Phase Retrieval Using The Fourier Series Expansion ». Dans 14th Congress of the International Commission for Optics, sous la direction de Henri H. Arsenault. SPIE, 1987. http://dx.doi.org/10.1117/12.967166.

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Kourakos, V. G., P. Rambaud, S. Chabane, D. Pierrat et J. M. Buchlin. « Two-phase flow modelling within expansion and contraction singularities ». Dans MULTIPHASE FLOW 2009. Southampton, UK : WIT Press, 2009. http://dx.doi.org/10.2495/mpf090031.

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Bowers, Chad D., et Predrag S. Hrnjak. « Developing Flow Map for Two-Phase R134a after Expansion Device ». Dans SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2008. http://dx.doi.org/10.4271/2008-01-0736.

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Kourakos, V. G., P. Rambaud, S. Chabane, J. M. Buchlin, Liejin Guo, D. D. Joseph, Y. Matsumoto, Y. Sommerfeld et Yueshe Wang. « Modeling of pressure drop in two-phase flow within expansion geometries ». Dans THE 6TH INTERNATIONAL SYMPOSIUM ON MULTIPHASE FLOW, HEAT MASS TRANSFER AND ENERGY CONVERSION. AIP, 2010. http://dx.doi.org/10.1063/1.3366466.

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Ahmed, W. H., C. Y. Ching et M. Shoukri. « Characteristics of Air-Oil Two-Phase Flow Across a Sudden Expansion ». Dans ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45554.

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The pressure recovery and void fraction change of air-oil two-phase flow across a sudden expansion has been investigated experimentally over a range of flow conditions. The pressure upstream and downstream of a half-inch to one-inch sudden expansion was measured using a series of pressure taps, and capacitance sensors were used to measure the void fraction along the test section. The void fraction increases as the flow approaches the sudden expansion section, with a sudden increase immediately downstream of the expansion followed by a gradual relaxation to the fully developed value further downstream. The normalized pressure recovery coefficient using the dynamic head based on the homogeneous density and two-phase velocity is found to collapse when plotted as a function of the mass quality. The experimental pressure recovery data are compared with predictions from existing models, and are found to be in good agreement with the Delhaye model with the void fraction relation of Wallis.
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Chen, Tsung-Yi, Adam R. Williamson et Richard D. Wesel. « Asymptotic expansion and error exponent for two-phase feedback codes on DMCs ». Dans 2014 IEEE International Symposium on Information Theory (ISIT). IEEE, 2014. http://dx.doi.org/10.1109/isit.2014.6875277.

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Kondo, Koichi, Kenji Yoshida, Tadayoshi Matsumoto, Tomio Okawa et Isao Kataoka. « Flow Patterns of Gas-Liquid Two-Phase Flow in Round Tube With Sudden Expansion ». Dans 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22154.

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Experimental studies were made on the multi-dimensional behavior of upward gas-liquid two-phase flow through the vertical round tube with an axisymmetric sudden expansion, which is one of the typical multi-dimensional channel geometry. The aims of this study are to clarify the multi-dimensional behavior of bubbly or slug flow affected by sudden expansion channel geometry, and to accumulate the experimental data for two-phase flow analysis, which is applicable to predict with appropriate accuracy the multi-dimensional its behavior. The direct observation using high-speed video camera was performed and revealed the multi-dimensional dynamic flow behavior with bubbles and gas-slug affected by the sudden expansion part (20 mm-tube to 50 mm-tube). The characteristic phenomena were observed such as bubble break-up, deformation due to the strong shear of liquid flow, or liquid micro jet penetration through the gas-slug, and so on. From these results, the flow regime map and the flow patterns at the below and above of the sudden expansion part were classified in relation to the bubble diameter. Additionally, the measurement of the void fraction profiles in the tube cross sections of sudden expansion were conducted at the different axial positions. The void fraction was measured using a point-electrode resistivity probe. The void fraction measurements in this study showed in detail that how the two phase flow develops along the direction of the downstream of the sudden expansion. In just above the sudden expansion, the void fraction distribution appeared the wall peak or the core peak in void fraction in the upstream of the sudden expansion. In the downstream of the sudden expansion, the void fraction distribution changes from a saddle shape or power-low shape into finally the saddle shape as the bubbly flow develops along the downstream of the sudden expansion. These experimental data in the sudden expansion of a vertical upward bubbly flow would become benchmark with respect to the multi-dimensional behavior of the two-phase flow analysis.
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Tao, Zhang, Zhao Yonghong et Zhou Dan. « Numerical simulation on expansion characters of solid phase in two phases fluidized bed ». Dans 2011 International Conference on Consumer Electronics, Communications and Networks (CECNet). IEEE, 2011. http://dx.doi.org/10.1109/cecnet.2011.5769410.

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Jeong, Hye-In, et Sang-Hoon Kim. « Expansion Technique of the Current Reconstruction Areas for Two-Phase Three-Leg Inverters ». Dans IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2022. http://dx.doi.org/10.1109/iecon49645.2022.9969072.

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Rapports d'organisations sur le sujet "TWO-PHASE EXPANSION"

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Barg, Rivka, Erich Grotewold et Yechiam Salts. Regulation of Tomato Fruit Development by Interacting MYB Proteins. United States Department of Agriculture, janvier 2012. http://dx.doi.org/10.32747/2012.7592647.bard.

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Background to the topic: Early tomato fruit development is executed via extensive cell divisions followed by cell expansion concomitantly with endoreduplication. The signals involved in activating the different modes of growth during fruit development are still inadequately understood. Addressing this developmental process, we identified SlFSM1 as a gene expressed specifically during the cell-division dependent stages of fruit development. SlFSM1 is the founder of a class of small plant specific proteins containing a divergent SANT/MYB domain (Barg et al 2005). Before initiating this project, we found that low ectopic over-expression (OEX) of SlFSM1 leads to a significant decrease in the final size of the cells in mature leaves and fruits, and the outer pericarp is substantially narrower, suggesting a role in determining cell size and shape. We also found the interacting partners of the Arabidopsis homologs of FSM1 (two, belonging to the same family), and cloned their tomato single homolog, which we named SlFSB1 (Fruit SANT/MYB–Binding1). SlFSB1 is a novel plant specific single MYB-like protein, which function was unknown. The present project aimed at elucidating the function and mode of action of these two single MYB proteins in regulating tomato fruit development. The specific objectives were: 1. Functional analysis of SlFSM1 and its interacting protein SlFSB1 in relation to fruit development. 2. Identification of the SlFSM1 and/or SlFSB1 cellular targets. The plan of work included: 1) Detailed phenotypic, histological and cellular analyses of plants ectopically expressing FSM1, and plants either ectopically over-expressing or silenced for FSB1. 2) Extensive SELEX analysis, which did not reveal any specific DNA target of SlFSM1 binding, hence the originally offered ChIP analysis was omitted. 3) Genome-wide transcriptional impact of gain- and loss- of SlFSM1 and SlFSB1 function by Affymetrix microarray analyses. This part is still in progress and therefore results are not reported, 4) Search for additional candidate partners of SlFSB1 revealed SlMYBI to be an alternative partner of FSB1, and 5) Study of the physical basis of the interaction between SlFSM1 and SlFSB1 and between FSB1 and MYBI. Major conclusions, solutions, achievements: We established that FSM1 negatively affects cell expansion, particularly of those cells with the highest potential to expand, such as the ones residing inner to the vascular bundles in the fruit pericarp. On the other hand, FSB1 which is expressed throughout fruit development acts as a positive regulator of cell expansion. It was also established that besides interacting with FSM1, FSB1 interacts also with the transcription factor MYBI, and that the formation of the FSB1-MYBI complex is competed by FSM1, which recognizes in FSB1 the same region as MYBI does. Based on these findings a model was developed explaining the role of this novel network of the three different MYB containing proteins FSM1/FSB1/MYBI in the control of tomato cell expansion, particularly during fruit development. In short, during early stages of fruit development (Phase II), the formation of the FSM1-FSB1 complex serves to restrict the expansion of the cells with the greatest expansion potential, those non-dividing cells residing in the inner mesocarp layers of the pericarp. Alternatively, during growth phase III, after transcription of FSM1 sharply declines, FSB1, possibly through complexing with the transcription factor MYBI serves as a positive regulator of the differential cell expansion which drives fruit enlargement during this phase. Additionally, a novel mechanism was revealed by which competing MYB-MYB interactions could participate in the control of gene expression. Implications, both scientific and agricultural: The demonstrated role of the FSM1/FSB1/MYBI complex in controlling differential cell growth in the developing tomato fruit highlights potential exploitations of these genes for improving fruit quality characteristics. Modulation of expression of these genes or their paralogs in other organs could serve to modify leaf and canopy architecture in various crops.
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Experience with clinical training in postabortion care in Egypt : Improving medical and interpersonal skills. Population Council, 1997. http://dx.doi.org/10.31899/rh1997.1019.

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The Population Council’s Asia and Near East Operations Research and Technical Assistance (ANE OR/TA) Project is collaborating with AVSC International to incorporate the addition of improved postabortion care procedures into the ongoing Safe Reproductive Health Care project. An element in the next phase of the program’s evolution was a two-day seminar held in Alexandria, Egypt. This seminar provided an opportunity for staff from ten hospitals that participated in the 1996–97 expansion program to present their own experience and impressions of the postabortion case-management procedures, and to discuss their strengths and weaknesses. This report presents an overview of this meeting’s presentations and discussions.
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