Bibliografie tematiche / Current-flow model

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Letteratura scientifica selezionata sul tema "Current-flow model"

Autore: Grafiati
Pubblicato: 4 giugno 2025
Ultima modifica: 1 agosto 2025

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Articoli di riviste sul tema "Current-flow model"

1

Drago, M. "A coupled debris flow–turbidity current model." Ocean Engineering 29, no. 14 (2002): 1769–80. http://dx.doi.org/10.1016/s0029-8018(02)00008-2.

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ABE, Yutaka. "Applicability of Annular Flow Model to Counter-Current Flow in Debris Beds." Journal of Nuclear Science and Technology 32, no. 8 (1995): 763–72. http://dx.doi.org/10.1080/18811248.1995.9731771.

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3

Peng, Guang Han. "Multiple Lattices Model of Traffic Flow with Relative Current." Applied Mechanics and Materials 178-181 (May 2012): 2784–87. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.2784.

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Abstract (sommario):
A new lattice model of traffic flow is proposed by considering the information of front multiple sites with relative current. The linear stability condition is obtained by using the linear stability theory. Numerical simulation shows that the proposed model is consistent with the theoretical analysis.
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4

ZHU, WEN-XING, and EN-XIAN CHI. "ANALYSIS OF GENERALIZED OPTIMAL CURRENT LATTICE MODEL FOR TRAFFIC FLOW." International Journal of Modern Physics C 19, no. 05 (2008): 727–39. http://dx.doi.org/10.1142/s0129183108012467.

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A generalized optimal current lattice model (GOCLM) for traffic flow is proposed to describe the motion of the dynamical traffic flow with a consideration of multi-interaction of the front lattice sites. In order to verify the reasonability of the new model, the stability condition is obtained by the use of linear stability theory. The modified KdV (Korteweg–de Vries) equation is derived by the use of the nonlinear analysis method and the kink-antikink soliton solution is obtained near the critical point. The propagation velocities of density waves are calculated for different numbers of the f
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5

Pereira, Marcos, and Luiz Cera Zanetta. "A current based model for load flow studies with UPFC." IEEE Transactions on Power Systems 28, no. 2 (2013): 677–82. http://dx.doi.org/10.1109/tpwrs.2012.2206409.

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6

Bosa, Silvia, Marco Petti, Francesco Lubrano, and Sara Pascolo. "Morphodynamic Model Suitable for River Flow and Wave-Current Interaction." IOP Conference Series: Materials Science and Engineering 245 (October 2017): 062005. http://dx.doi.org/10.1088/1757-899x/245/6/062005.

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7

Sauerzopf, F. M., H. P. Wiesinger, and H. W. Weber. "Anisotropic current flow and demagnetization corrections in the Bean model." Cryogenics 30, no. 7 (1990): 650–55. http://dx.doi.org/10.1016/0011-2275(90)90303-t.

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8

Li, Song, Yali Zhang, and Jiahong Xun. "Studies on the hybrid model and flow characteristics in vanadium redox flow battery." Journal of Physics: Conference Series 3031, no. 1 (2025): 012007. https://doi.org/10.1088/1742-6596/3031/1/012007.

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Abstract To improve the operating efficiency of vanadium redox flow battery (VRB), this paper considers the effects of electrolyte flow rate and charge-discharge current on the VRB operation state. By coupling the equivalent loss model, the electrochemical model, and the pump loss model to establish a hybrid model for VRB. Through simulation analysis of the established model, obtain the influence rules of electrolyte flow rate and current change on VRB operating efficiency, thereby obtaining the optimal flow rate corresponding to currents of different sizes that maximizes operating efficiency.
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Zhang, Hong-Quan, Qian Wang, Cem Sarica, and James P. Brill. "Unified Model for Gas-Liquid Pipe Flow via Slug Dynamics—Part 2: Model Validation." Journal of Energy Resources Technology 125, no. 4 (2003): 274–83. http://dx.doi.org/10.1115/1.1615618.

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In Zhang et al. [1], a unified hydrodynamic model is developed for prediction of gas-liquid (co-current) pipe flow behavior based on slug dynamics. In this study, the new model is validated with extensive experimental data acquired with different pipe diameters, inclination angles, fluid physical properties, gas-liquid flow rates and flow patterns. Good agreement is observed in every aspect of the two-phase pipe flow.
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Turnbull, Barbara, and Jim N. McElwaine. "Potential flow models of suspension current air pressure." Annals of Glaciology 51, no. 54 (2010): 113–22. http://dx.doi.org/10.3189/172756410791386490.

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AbstractWe present, analyse and discuss air-pressure data from finite-volume chute flows of dry fine snow in air. These experiments have the correct similarity criteria to model powder-snow avalanches and demonstrate the transition from a dense to a suspended flow. We measured the dynamic air pressure at the base of the flow, which features a marked negative pressure peak immediately behind the front. This feature is also seen in observations of natural powder-snow avalanches measured in Russia, Japan and Switzerland in direct numerical simulations of non-Boussinesq suspension flows and in pin
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Tesi sul tema "Current-flow model"

1

Bai, Yang. "Simulating Surface Flow and Sediment Transport in Vegetated Watershed for Current and Future Climate Condition." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/333038.

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The complex interaction between flow, vegetation and sediment drives the never settled changes of riverine system. Vegetation intercepts rainfall, adds resistance to surface flow, and facilitates infiltration. The magnitude and timing of flood flow are closely related to the watershed vegetation coverage. In the meantime, flood flow can transport a large amount of sediment resulting in bank erosion, channel degradation, and channel pattern change. As climate changes, future flood frequency will change with more intense rainfalls. However, the quantitative simulation of flood flow in vegetated
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Seidel, T., and M. Beyer. "Two-phase flow experiments in a model of the hot leg of a pressurised water reactor." Helmholtz-Zentrum Dresden-Rossendorf, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-85349.

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In order to investigate the two-phase flow behaviour in a complex reactor-typical geometry and to supply suitable data for CFD code validation, a model of the hot leg of a pressurised water reactor was built at FZD. The hot leg model is operated in the pressure chamber of the TOPFLOW test facility, which is used to perform high-pressure experiments under pressure equilibrium with the inside atmosphere of the chamber. This technique makes it possible to visualise the two-phase flow through large windows, also at reactor-typical pressure levels. In order to optimise the optical observation possi
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Besnard, Stephane. "Performance and application of the Modular Acoustic Velocity Sensor (M.A.V.S.) current meter for laboratory measurements." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1538.

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Every type of current meter is different and has its proper characteristics. Knowing the performance of a current meter is essential in order to use it properly either for field or laboratory measurements (such as in the Offshore Technology Research Center wave basin). A study of the MAVS (Modular Acoustic Velocity Sensor) in a wave basin is a first step essential for later deployment in real studies. This thesis is based on data obtained from different series of laboratory measurements conducted in the OTRC wave basin. The objective of the first part of the study was to characterize the MAVS
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Seidel, Tobias, Christoph Vallée, Dirk Lucas, Matthias Beyer, and Darlianto Deen. "Two-phase flow experiments in a model of the hot leg of a pressurised water reactor." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-33535.

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Abstract (sommario):
In order to investigate the two-phase flow behaviour in a complex reactor-typical geometry and to supply suitable data for CFD code validation, a model of the hot leg of a pressurised water reactor was built at FZD. The hot leg model is operated in the pressure chamber of the TOPFLOW test facility, which is used to perform high-pressure experiments under pressure equilibrium with the inside atmosphere of the chamber. This technique makes it possible to visualise the two-phase flow through large windows, also at reactor-typical pressure levels. In order to optimise the optical observation possi
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5

Beyer, Matthias, Dirk Lucas, Heiko Pietruske, and Lutz Szalinski. "Two-Phase Flow Experiments on Counter-Current Flow Limitation in a model of the Hot Leg of a Pressurized Water Reactor (2015 test series)." Helmholtz-Zentrum Dresden-Rossendorf, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-216094.

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Abstract (sommario):
Counter-Current Flow Limitation (CCFL) is of importance for PWR safety analyses in several accident scenarios connected with loss of coolant. Basing on the experiences obtained during a first series of hot leg tests now new experiments on counter-current flow limitation were conducted in the TOPFLOW pressure vessel. The test series comprises air-water tests at 1 and 2 bar as well as steam-water tests at 10, 25 and 50 bar. During the experiments the flow structure was observed along the hot leg model using a high-speed camera and web-cams. In addition pressure was measured at several positions
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Seidel, T., and M. Beyer. "Two-phase flow experiments in a model of the hot leg of a pressurised water reactor." Helmholtz-Zentrum Dresden-Rossendorf, 2011. https://hzdr.qucosa.de/id/qucosa%3A22146.

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Abstract (sommario):
In order to investigate the two-phase flow behaviour in a complex reactor-typical geometry and to supply suitable data for CFD code validation, a model of the hot leg of a pressurised water reactor was built at FZD. The hot leg model is operated in the pressure chamber of the TOPFLOW test facility, which is used to perform high-pressure experiments under pressure equilibrium with the inside atmosphere of the chamber. This technique makes it possible to visualise the two-phase flow through large windows, also at reactor-typical pressure levels. In order to optimise the optical observation possi
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7

El-Geziry, Tarek Mohamed Ahmed. "Environmental impact assessment and process simulation of the tidal current energy resource in the Strait of Messina." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4779.

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Abstract (sommario):
Interest in exploring renewable energy resources has increased globally, especially with recent worldwide intentions to maintain the global climate. Looking at the oceans as a vast sustainable clean energy resource to satisfy present high humankind energy demands has been strongly recommended. Several types of renewable energy resources exist in the oceans: waves, tides, thermal and salinity variations, currents, and offshore winds. Exploiting tidal currents is considered one of the most effective approaches to the generation of electricity. Tidal turbines are deployed beneath the sea surface
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Breckenfelder, Tilia-Manuela [Verfasser], Monika [Akademischer Betreuer] [Gutachter] Rhein, and Paul G. [Gutachter] Myers. "North Atlantic Current in model and observations: Transport variability, flow paths and hydrography / Tilia-Manuela Breckenfelder ; Gutachter: Monika Rhein, Paul G. Myers ; Betreuer: Monika Rhein." Bremen : Staats- und Universitätsbibliothek Bremen, 2017. http://d-nb.info/1138338419/34.

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ANDRADE, DELVONEI A. de. "Analise termo hidrodinamica de uma centrifuga a contracorrente." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10721.

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Made available in DSpace on 2014-10-09T12:43:20Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:10Z (GMT). No. of bitstreams: 1 06481.pdf: 5013180 bytes, checksum: 7fd69f45c605162fe74bdcf0decbd24d (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Gerber, George. "Experimental measurement and numerical modelling of velocity, density and turbulence profiles of a gravity current." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/841.

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Libri sul tema "Current-flow model"

1

Wei, Eugene. Hydrodynamic model development for the Port of New York/New Jersey water level and current nowcast/forecast model system. National Oceanic and Atmospheric Administration, U.S. Dept. of Commerce, National Ocean Service, Office of Coast Survey, Coast Survey Development Laboratory, 2001.

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2

Khadr, Ali. A method for macroeconomic consistency in current and constant prices: An accounting method for showing budget flow and stock relations, in current and constant prices, for a six-sector economy. Country Economics Dept., World Bank, 1989.

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3

Yudaev, Vasiliy. Hydraulics. INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/996354.

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The textbook corresponds to the general education programs of the general courses "Hydraulics" and "Fluid Mechanics". The basic physical properties of liquids, gases, and their mixtures, including the quantum nature of viscosity in a liquid, are described; the laws of hydrostatics, their observation in natural phenomena, and their application in engineering are described. The fundamentals of the kinematics and dynamics of an incompressible fluid are given; original examples of the application of the Bernoulli equation are given. The modes of fluid motion are supplemented by the features of the
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4

Kasprzak, Jaroslaw D., Anita Sadeghpour, and Ruxandra Jurcut. Doppler echocardiography. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780198726012.003.0003.

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Doppler examination is an integral part of the echocardiogram. Current systems are equipped with spectral Doppler in continuous wave mode (offering measurements of high velocities with limited spatial specificity due to integration of signal along the scan line), pulsed wave mode (high spatial specificity with maximal recordable velocity reduced by the Nyquist limit), and colour Doppler flow mapping (allowing rapid identification of flow pattern within a cross-sectional B-mode sector). Tissue Doppler echocardiography emerged as a basic tool for sampling regional myocardial velocities, in pulse
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Sanz-Ramos, M., L. Cea, E. Bladé, et al. Iber v3. Reference manual and user's interface of the new implementations. CIMNE, 2022. http://dx.doi.org/10.23967/iber.2022.01.

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Iber is a two-dimensional hydraulic model for the simulation of free surface flow in rivers and estuaries, and the simulation of environmental processes in fluvial hydraulics. Since the release of the first version of Iber, which included a hydrodynamic calculation engine fully coupled with sediment transport processes and turbulence, it has evolved to become a free surface flow modelling tool for highly complex environmental processes. This document presents the developments made for version 3, where the advances are applied mainly in four current research lines: a new urban drainage module,
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Kortgen, Andreas, and Michael Bauer. Hepatic function in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0175.

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The liver with its parenchymal and non-parenchymal cells plays a key role in the organism with manifold functions of metabolism, synthesis, detoxification, excretion, and host response. This requires a portfolio of different tests to obtain an overview of hepatic function. In the critically ill hepatic dysfunction is common and potentially leading to extrahepatic organ dysfunctions culminating in multi-organ failure. Conventional laboratory measures are used to evaluate hepatocellular damage, cholestasis, or synthesis. They provide valuable (differential) diagnostic data and can yield prognost
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Beckert, Jens, and Richard Bronk, eds. Uncertain Futures. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198820802.001.0001.

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Uncertain Futures considers how economic actors visualize the future and decide how to act in conditions of radical uncertainty. It starts from the premise that since dynamic capitalist economies are characterized by relentless innovation and novelty, they exhibit an indeterminacy that cannot be reduced to measurable risk. The organizing question then becomes how economic actors form expectations and make decisions despite the uncertainty they face. The current microfoundations of standard economics cannot handle genuinely uncertain futures. Instead, uncertainty requires an entirely new model
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Garbi, Madalina. The general principles of echocardiography. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199599639.003.0001.

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Knowledge of basic ultrasound principles and current echocardiography technology features is essential for image interpretation and for optimal use of equipment during image acquisition and post-processing.Echocardiography uses ultrasound waves to generate images of cardiovascular structures and to display information regarding the blood flow through these structures.The present chapter starts by presenting the physics of ultrasound and the construction and function of instruments. Image formation, optimization, display, presentation, storage, and communication are explained. Advantages and di
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Garbi, Madalina, Jan D’hooge, and Evgeny Shkolnik. General principles of echocardiography. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780198726012.003.0001.

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Echocardiography uses ultrasound waves to generate images of cardiovascular structures and to display information regarding the blood flow through these structures. Knowledge of basic ultrasound principles and current technology is essential for image interpretation and for optimal use of equipment during image acquisition and post-processing. This chapter starts by presenting the physics of ultrasound and the construction and function of instruments. Image formation, optimization, display, presentation, storage, and communication are explained. Advantages and disadvantages of available imagin
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Shadle, Matthew A. Globalization and Benedict XVI’s Caritas in Veritate. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190660130.003.0015.

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In recent years the economy has become globalized. Globalization is the increased flow of goods, services, capital, people, and culture facilitated by innovations in transportation and communication technologies. This chapter examines the phenomenon of globalization and its impact on Catholic social teaching. It looks, in particular, at Pope Benedict XVI’s encyclical Caritas in Veritate. Pope Benedict criticizes how the current global economy exploits and excludes vulnerable populations around the world. Caritas in Veritate further develops the communio framework initiated by John Paul II and
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Capitoli di libri sul tema "Current-flow model"

1

Schierwagen, A., and J. Francu. "A New Model for Current Flow in Dendrites of Arbitrary Geometry." In Systems Analysis and Simulation II. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-8936-1_70.

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Freund, D., A. Kloes, and A. Kostka. "A 2D Analytical Model of Current-Flow in Lateral Bipolar Transistor Structures." In Simulation of Semiconductor Devices and Processes. Springer Vienna, 1993. http://dx.doi.org/10.1007/978-3-7091-6657-4_105.

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Wei, Kai, Qing Li, Yi Yao, and Yeqing Sun. "Use of Temporal Convolutional Network with an Attention Mechanism and a Bidirectional Gated Recurrent Unit to Capture and Predict Slope Debris Flow Risk." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4355-1_6.

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AbstractA novel approach for predicting slope debris flow risk is proposed to address the issue of single-factor data modeling in current slope debris flow risk prediction. The DA-TCN-BiGRU approach combines the dual attention mechanism, temporal convolutional network, and bidirectional gated recurrent unit. Based on the slope debris flow simulation platform, rainfall, soil shear wave velocity, surface displacement, soil pressure and soil moisture data are collected. The data warning features of debris flow risk are captured using the TOSIS entropy method, and the risk level of the slope debri
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Koop, A. H., C. M. Klaij, and G. Vaz. "Viscous-Flow Calculations for Model and Full-Scale Current Loads on Typical Offshore Structures." In Computational Methods in Applied Sciences. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6143-8_1.

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Ge, Mengyan. "Assessing the Impact of Dongzhuang Water Conservancy Hub on Vegetation Ecological Distribution Based on Numerical Simulation and Machine Learning." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-9184-2_33.

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AbstractThe current assessment of the ecological benefit of reservoirs commonly lacks quantitative calculation of actual ecological distribution. The spatial distribution prediction of vegetation growth generally requires the concurrent application of multiple numerical models, which are complicated and involve numerous parameters. This research comprehensively utilized a surface hydrodynamics numerical model and machine learning method to construct a flow-based vegetation growth prediction model. The ecological impact during the storage period and regulation period after the completion of the
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Yizhuo, Wang, Li Zhonlian, Li Long, Li Runhua, Cui Xinglei, and Fang Zhi. "Prediction and Evaluation Method of Modification Effect of Large-Scale DBD Insulation Materials Based on Distributed Current Measurement and Neural Network Model." In Lecture Notes in Electrical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-4856-6_8.

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Abstract Wide dielectric barrier discharge (DBD) has broad application prospects in the modification of insulating materials, but the aging of the electrode directly affects the modification effect in the application process. As the size of the DBD device increases, the real-time evaluation of its modification effect becomes more complicated. Therefore, this paper proposes a real-time prediction and evaluation method for the modification effect of wide DBD insulation materials based on distributed current measurement and neural network model. The operating condition parameters such as DBD exci
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Bo, Meifang, Baojun Zheng, Shengli Zhang, Zhengxu Ren, and Bojie Liu. "Research on the Optimization of Commercial PWR’S Financial Evaluation Model." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_90.

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AbstractConsidering industry standards, policies, market environment, actual costs of nuclear power plants (NPPs) and technical characteristics of nuclear power, and combining with industrial circumstances when these industry standards were published, we analyzed the limitations of current commercial PWR’s fianancial evaluation methods. Taking HPR1000 as a case study, we deeply estimated the generation cost and cash flow. Moreover, optimization direction of the financial evaluation model after comparative analysis was proposed. This research aims to provide reference to similar NPPs’financial
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Kirchheck, Daniel, Dominik Saile, and Ali Gülhan. "Rocket Wake Flow Interaction Testing in the Hot Plume Testing Facility (HPTF) Cologne." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_9.

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Abstract Rocket wake flows were under investigation within the Collaborative Research Centre SFB/TRR40 since the year 2009. The current paper summarizes the work conducted during its third and final funding period from 2017 to 2020. During that phase, focus was laid on establishing a new test environment at the German Aerospace Center (DLR) Cologne in order to improve the similarity of experimental rocket wake flow–jet interaction testing by utilizing hydrogen–oxygen combustion implemented into the wind tunnel model. The new facility was characterized during tests with the rocket combustor mod
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Liu, Yan, Xiaojing Liu, Sijia Du, Jiageng Wang, and Hui He. "Multi-Physics Coupling Model for Thermal Hydraulics and Solute Transport in CRUD Deposits." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_35.

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AbstractThe porous Chalk River Unidentified Deposit (CRUD) depositions on the fuel cladding have a great impact on the heat transfer and power distribution of the reactor, resulting in a decrease in reactor safety and economy. In current paper, a multi-physics model is developed to simulate thermal hydraulics and boron hideout within the CRUD depositions. Processes including heat transfer, pressure drop, capillary flow, solute transport, chemical reactions and radiolysis reactions are fully coupled. The coolant flows through the capillary tubes in the porous medium and evaporates into steam at
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Xu, Donglin, Chunguang Zhang, Qingbo Song, and Lifang Zhang. "Design and Simulation of EMU Traction Control System Based on Simulink." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7887-4_25.

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Abstract In view of the high harmonic content of AC–DC–AC locomotive, which will sometimes damage the important equipment of locomotive and even cause accidents such as circuit tripping, this paper first takes CRH2 EMU train as the research object, analyzes the working principle of its traction drive system and four-quadrant pulse rectifier with three-level topology, and designs and simulates the main rectifier circuit of this EMU with Simulink simulation software. Then, the simulation models of the main rectifier circuit of the EMU, including main circuit, transient current control module, ne
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Atti di convegni sul tema "Current-flow model"

1

Bennett, Jack, Thomas Turk, and Robert F. Savinell. "Mathematical Modeling of the Effects of Current Flow Through Concrete." In CORROSION 1994. NACE International, 1994. https://doi.org/10.5006/c1994-94285.

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Abstract A mathematical model was developed to predict the movement of ions resulting from the flow of direct current through concrete. The model is based on applying a differential mass balance and incorporating flux equations based on dilute solution theory. Electrochemical reactions establish flux equations which determine the boundary conditions at the electrode surfaces. The model was used to predict the effects of different variables on the development of chloride and hydroxide concentration profiles. Variables examined include chloride concentration, chloride distribution, pH, temperatu
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Li, Lili, Yonggang Li, Li Chang, Rongzhang Cao, Jinyu Guan, and Yulu Wang. "Iterative Clearing Model and Method for Electricity Spot Market with Embedded Direct Current Power Flow Security Check." In 2024 IEEE 8th Conference on Energy Internet and Energy System Integration (EI2). IEEE, 2024. https://doi.org/10.1109/ei264398.2024.10990428.

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Kesana, N. R., R. Vieira, M. Parsi, B. S. McLaury, and S. A. Shirazi. "A Mechanistic Model for Predicting Erosion in Pseudo Slug Flow." In CORROSION 2014. NACE International, 2014. https://doi.org/10.5006/c2014-4221.

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Abstract Sand particles, which are frequently entrained with the production fluids while transporting from a reservoir to surface facilities, can cause severe erosion and erosion-corrosion damage to production facilities. The mechanism of sand erosion of pipelines due to multiphase flows is complex because of the coupling of several factors that affect the severity of erosion. The severity of erosion normally increases for gas dominated flows such as mist, annular, pseudo slug, and slug/churn flows. This work focuses on improvement and extension of a one-dimensional slug flow erosion model to
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4

Srinivasan, Vedanth. "Evaluation of Flow Coupled CO2 Corrosion Using CFD: Kinetics & Hydrodynamics." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05694.

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Abstract A Comprehensive numerical model has been developed for computing corrosion rates generated by CO2 saturated aqueous solutions in an internal flow configuration. The fundamental fluid flow is characterized by numerical solutions to Navier-Stokes conservation equations for mass, momentum and energy, accompanied by models to capture turbulence generated by the flow. Particularly, the near-wall flow is captured using advanced wall treatment approaches to accurately track the viscous sub layer behavior generated by the turbulent flow. The corrosion rates are then computed by modeling the e
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Uchida, S., M. Naitoh, Y. Uehara, H. Okada, S. Koshizuka, and D. H. Lister. "Evaluation of Flow Accelerated Corrosion of PWR Secondary Piping by Coupling Analysis of Corrosion and Flow Dynamics." In CORROSION 2009. NACE International, 2009. https://doi.org/10.5006/c2009-09468.

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Abstract Systematic approaches for evaluating flow accelerated corrosion (FAC) are desired before discussing application of countermeasures for FAC. Firstly, future FAC occurrence should be evaluated to identify locations where a higher possibility of FAC occurrence exists, and then, wall thinning rate at the identified FAC occurrence zone is evaluated to obtain the preparation time for applying countermeasures. Wall thinning rates were calculated with the coupled models of static electrochemical analysis and dynamic double oxide layer analysis. Anodic current density and electrochemical corro
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Khajehoddin, S. A., A. Bakhshai, and P. K. Jain. "A Current Flow Model for m-Level Diode-Clamped Multilevel Converters." In IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics. IEEE, 2006. http://dx.doi.org/10.1109/iecon.2006.347900.

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7

Afshin, H., and B. Firoozabadi. "Numerical Simulation of Density Current Using Two Phase Flow." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98174.

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Due to shear layer at the interface of density current and ambient fluid, density current disturbs and entrains the surrounding fluid. Most existing analytical and numerical models for density current flows are based on the equations for single-phase flows. In this research, the density current has been modeled with two-phase flow model. The governing equations are continuity, x- momentum, and y- momentum equations for every fluid. The volume-of-fluid (VOF) interface tracking technique which uses a piecewise-linear interface calculation (PLIC) in each cell is used to determine the deformation
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8

James, S. C., J. D. Roberts, and Parmeshwar L. Shrestha. "Simulating Flow Changes Due to Current Energy Capture: SNL-EFDC Model Verification." In World Environmental and Water Resources Congress 2014. American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413548.085.

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Liu, Jun, Xu Wang, Wanliang Fang, et al. "A novel load flow model for distribution systems based on current injections." In 2016 China International Conference on Electricity Distribution (CICED). IEEE, 2016. http://dx.doi.org/10.1109/ciced.2016.7576094.

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Tekavčič, Matej, Boštjan Končar, and Ivo Kljenak. "Simulation of Counter-Current Gas-Liquid Churn Flow." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17664.

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A transient simulation of air-water counter-current flow by the means of two-fluid model with interface sharpening is performed. The gas-liquid inhomogeneous model with both phases considered as incompressible is used. Turbulence is modelled for each phase separately using the two-equation eddy viscosity model. The numerical domain consists of an axisymmetric wedge with the porous wall inlet region representing a vertical pipe experimental test section. Evolution of volume fraction, velocities and pressure variations along the interface is presented. Simulation results are compared with the kn
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Rapporti di organizzazioni sul tema "Current-flow model"

1

Orr, Brennon R., and Dana L. Dettmers. Current conceptual model of groundwater flow and contaminant transport at Sandia National Laboratories/New Mexico Technical Area V. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/918762.

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Gaines, Roger, Stephen Sanborn, William McAnally, and Christopher Wallen. Mississippi River Adaptive Hydraulics model development and evaluation, Commerce to New Madrid, Missouri, Reach. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/39519.

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A numerical, two-dimensional hydrodynamic model of the Mississippi River, from Thebes, IL, to Tiptonville, TN (128 miles/206 km), was developed using the Adaptive Hydraulics model. The study objective assessed current patterns and flow distributions and their possible impacts on navigation due to Birds Point New Madrid Floodway (BPNMF) operations and the Len Small (LS) levee break. The model was calibrated to stage, discharge, and velocity data for the 2011, 2015–2016, and 2017 floods. The calibrated model was used to run four scenarios, with the BPNMF and the LS breach alternately active/open
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Kumar, Kaushal, and Yupeng Wei. Attention-Based Data Analytic Models for Traffic Flow Predictions. Mineta Transportation Institute, 2023. http://dx.doi.org/10.31979/mti.2023.2211.

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Traffic congestion causes Americans to lose millions of hours and dollars each year. In fact, 1.9 billion gallons of fuel are wasted each year due to traffic congestion, and each hour stuck in traffic costs about $21 in wasted time and fuel. The traffic congestion can be caused by various factors, such as bottlenecks, traffic incidents, bad weather, work zones, poor traffic signal timing, and special events. One key step to addressing traffic congestion and identifying its root cause is an accurate prediction of traffic flow. Accurate traffic flow prediction is also important for the successfu
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Paolinelli, Luciano, and Srdjan Nesic. PR646-173609-Z01 Water Wetting Prediction Tool for Pipeline Integrity. Pipeline Research Council International, Inc. (PRCI), 2021. http://dx.doi.org/10.55274/r0012111.

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Current approaches for pipeline integrity management, as related to internal corrosion, largely depend on Internal Corrosion Direct Assessment (ICDA) type approach. An essential part of these assessments is to predict if corrosive water phase is in direct contact with the internal pipe wall, a phenomenon commonly called "water wetting". In general, water wetting prediction models currently used by pipe integrity engineers are lagging behind the current level understanding. The Institute for Corrosion and Multiphase Technology (ICMT) at Ohio University has developed and validated a mechanistic
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5

Gutenson, Joseph, Kent Sparrow, Stephen Brown, Mark Wahl, and Kyle Gordon. Case study of continental-scale hydrologic modeling’s ability to predict daily streamflow percentiles for regulatory application. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/49371.

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Regulatory practitioners use hydroclimatic data to provide context to observations typically collected through field site visits and aerial imagery analysis. In the absence of site-specific data, regulatory practitioners must use proxy hydroclimatic data and models to assess a stream's hydroclimatology. One intent of current-generation continental-scale hydrologic models is to provide such hydrologic context to ungaged watersheds. In this study, the ability of two state-of-the-art, operational, continental-scale hydrologic modeling frameworks, the National Water Model and the Group on Earth Ob
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Naderer, Thomas, Alexander Hammer, Wolfgang Roland, Maximilian Zacher, and Gerald Berger-Weber. Optimizing modeling the multilayer coextrusion flow of non-newtonian fluids through rectangular ducts: appropriate shear rate definition for a local power law formulation. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.gs.ms.4.

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The accuracy of viscosity predictions is a crucial aspect of polymer melt flow modeling and essential for the design of coextrusion die systems. In the field of non-Newtonian fluid modeling for coextrusion flows through rectangular ducts, significant progress has been made in understanding multilayer flow dynamics. Our fundamental research, employing numerical techniques such as the shooting method, finite element method, and finite difference method for flow evaluation, has established a critical base for the field. Our current research advances fluid dynamics by refining our existing numeric
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Nestleroth, Dr J. Bruce. PR-3-823-R01 Remote Field Eddy Current Detection of Stress-Corrosion Cracks. Pipeline Research Council International, Inc. (PRCI), 1990. http://dx.doi.org/10.55274/r0011870.

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The feasibility of detecting stress-corrosion cracks (SCC) using the Remote Field Eddy Current (RFEC) technique was demonstrated. The RFEC technique interrogates the entire thickness of the pipe and is applicable for in-line inspection. If it can be shown that the RFEC technique is effective in detecting SCC, then the technique is an ideal method for detecting the defects of interest. A defect detection model is proposed for explaining the mechanism for crack detection. For axially orientated, closed cracks, such as SCC, the conventional defect detection model proved to be too simplistic and n
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Fertitta, David, Maxwell Agnew, and David Ramirez. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers : HEC-RAS model. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45170.

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Upstream of the confluence of the Red River, Atchafalaya River, and ORCC Outflow Channel are vast low-lying flat areas on both sides of the Lower Red River. During times of high water on the Lower Red—whether from upstream water in the Red or from the ORCC Outflow Channel—enormous amounts of water flow over the natural riverbanks and flood this land. The loss of this water from the river into storage affects the operation of the ORCC, which in turn affects the stages and flows down the Atchafalaya and Mississippi Rivers. An improved understanding of this area and how water is stored during flo
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9

LaHatte, W., Ahmad Tavakoly, Sara Lytle, and James Lewis. Mississippi River climate model–based hydrograph projections at the Tarbert Landing location. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/47084.

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To better understand and prepare for the possible effects associated with potential climate changes on the lower Mississippi River, the State of Louisiana Coastal Protection and Restoration Authority sought information on the historical, current, and projected future hydrodynamics of the Mississippi River. To this end, flow duration curves (FDC) for the Tarbert Landing location were generated, based on climate models derived from two of the four scenarios of the Coupled Model Intercomparison Project, Phase 5 (CMIP5), multimodel ensemble representative concentration pathways (RCPs). The global
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Chem, Phalla, Philip Hirsch, and Someth Paradis. Hydrological Analysis in Support of Irrigation Management: A Case Study of Stung Chrey Bak Catchment, Cambodia. Cambodia Development Resource Institute, 2011. https://doi.org/10.64202/wp.59.201109.

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This study applies the Water Evaluation and Planning (WEAP) model to assess irrigation management in the Stung Chrey Bak catchment, Cambodia. It evaluates three scenarios—reference, 5 percent annual increase in irrigation demand, and additional reservoir storage—to explore sustainable water allocation strategies. The catchment supports 10,367 hectares of rice cultivation, with increasing pressure on water resources due to expanded dry season farming. The analysis reveals that while current stream flow can meet irrigation needs under existing conditions, unmet demand arises when environmental i
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