Relevant bibliographies by topics / Path flow

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Path flow'

Author: Grafiati
Published: 1 June 2024

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Journal articles on the topic "Path flow"

1

Camplejohn, Richard S. "Flow cytometry." Journal of Pathology 166, no. 3 (March 1992): 323–26. http://dx.doi.org/10.1002/path.1711660317.

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SRajput, U., and Bal Govind Shukla. "Path Factorization Induced Network Flow." International Journal of Computer Applications 121, no. 16 (July 18, 2015): 30–39. http://dx.doi.org/10.5120/21626-4929.

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Li, L., and J. C. K. Cheng. "Perceiving path from optic flow." Journal of Vision 11, no. 1 (January 26, 2011): 22. http://dx.doi.org/10.1167/11.1.22.

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Cheng, J., and L. Li. "Perceiving path from optic flow." Journal of Vision 11, no. 11 (September 23, 2011): 908. http://dx.doi.org/10.1167/11.11.908.

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Cheng, Lin, Yasunori Iida, and Nobuhiro Uno. "A STOCHASTIC FLOW-DEPENDENT MODEL FOR PATH FLOW ESTIMATION." INFRASTRUCTURE PLANNING REVIEW 18 (2001): 573–80. http://dx.doi.org/10.2208/journalip.18.573.

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ZHOU, Mingzheng, Ruichang ZHAO, Liuli SUN, and Huanran FAN. "ICONE23-1352 SIMULATION ANALYSIS OF INLET FLOW FIELD FOR AIR FLOW PATH OF PASSIVE CONTAINMENT COOLING SYSTEM." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_163.

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Park, Jun-Yong, Bo-Ra Kim, Deok-Young Sohn, Yun-Ho Choi, and Yong-Hee Lee. "A Study on Flow Characteristics and Flow Uniformity for the Efficient Design of a Flow Frame in a Redox Flow Battery." Applied Sciences 10, no. 3 (January 31, 2020): 929. http://dx.doi.org/10.3390/app10030929.

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As global environmental problems are worsening, the efficiency of storage systems for renewable energy are gaining importance. The redox flow battery (RFB), a promising energy storage system (ESS), is a device that generates or stores electricity through reduction–oxidation reactions between active materials constituting electrolytes. Herein, we proposed a flow frame design that reduces flow resistance in the flow path and causes uniform flow distribution in the electrode to develop an efficient redox flow battery. Through computational fluid dynamics (CFD) and experimental verification, we investigated the flow characteristics and flow uniformity inside the conventional redox flow battery cell. An analysis of the flow characteristics of the conventional flow frame revealed a non-uniform distribution of the flow discharged to the electrodes, owing to the complex (branched) flow path geometry of the inlet channel. To address this problem, we proposed a new flow frame design that removed and integrated bifurcations in the flow path. This new design significantly improved flow uniformity parameters, such as the symmetry coefficient ( C s y m ), variability range coefficient ( R i ), and maximum flow rate deviation ( D m ). Ultimately, we decreased the pressure drop by 15.3% by reducing the number of flow path bifurcations and chevron repositioning.
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Fukugami, Takato, and Tomofumi Matsuzawa. "Improvement of Network Flow Using Multi-Commodity Flow Problem." Network 3, no. 2 (April 4, 2023): 239–52. http://dx.doi.org/10.3390/network3020012.

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In recent years, Internet traffic has increased due to its widespread use. This can be attributed to the growth of social games on smartphones and video distribution services with increasingly high image quality. In these situations, a routing mechanism is required to control congestion, but most existing routing protocols select a single optimal path. This causes the load to be concentrated on certain links, increasing the risk of congestion. In addition to the optimal path, the network has redundant paths leading to the destination node. In this study, we propose a multipath control with multi-commodity flow problem. Comparing the proposed method with OSPF, which is single-path control, and OSPF-ECMP, which is multipath control, we confirmed that the proposed method records higher packet arrival rates. This is expected to reduce congestion.
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Ellmore, Timothy M., and Bruce L. McNaughton. "Human Path Integration by Optic Flow." Spatial Cognition & Computation 4, no. 3 (September 2004): 255–72. http://dx.doi.org/10.1207/s15427633scc0403_3.

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Sillekens, W. H., J. H. Dautzenberg, and J. A. G. Kals. "Strain Path Dependence of Flow Curves." CIRP Annals 40, no. 1 (1991): 255–58. http://dx.doi.org/10.1016/s0007-8506(07)61981-7.

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Dissertations / Theses on the topic "Path flow"

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Cheng, Chuen-kei Joseph, and 鄭傳基. "Path perception from optic flow." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B4961759X.

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Perceiving the path we are travelling on is important for successful navigation. Relative motion between the world and the observer generates optical flow on the retinae (retinal flow). Gibson (1950) pointed out that when travelling on a straight path with no eye, head, or body rotation, retinal flow is radial and the stationary point indicates the instantaneous direction of travelling, or heading, of the observer. The straight path can then be recovered as it coincides with heading. Nevertheless, it is rarely the case that people travel with no rotation. Instead, they normally look at different points of interest when they are navigating. The result of changing one's gaze or rotating one's head is the addition of a rotational component, which is a laminar flow, to the flow field. The rotational component shifts the stationary point from heading and makes heading perception difficult. Extensive research has been conducted on how the human visual system removes the rotational component of the retinal flow and how extra-retinal information, such as efferent copies of eye muscle commands, may contribute to this process. The paths on which people travel are not always straight, but often curved. When a path is curved, it no longer coincides with heading. In this case, heading is the tangent of the path. Researchers have proposed theories to explain how curved paths are perceived. Each of them requires different visual information and gaze conditions (e.g., fixating on a target or gazing along the heading direction). They can be categorized by whether or not path perception depends on heading perception. The goal of this thesis is to systematically examine different theories of path perception and determine how humans perceive curved paths. Study 1 examined different path perception theories by comparing human path perception performance in various gaze conditions and with the availability of various optic flow information. Study 2 investigated whether path perception depends on heading perception. Study 3 examined the contribution of reference objects to path perception. Study 4 investigated how extra-retinal informationcontribute to path perception. The experiments that I present here show that (a) when there is no extra-retinal information, path perception is accurate only when one's gaze is along heading such that the rotation in the flow field is equal to path rotation; (b) when one's gaze is not along heading such that the rotation in the flow field is not equal to path rotation, path perception is inaccurate. Adding more visual information, such as acceleration, dense flow field, and/ or reference objects does not improve the accuracy; (c) eye movement signals support accurate path perception only in the natural case of self-motion in which body orientation is aligned with heading such that eye movement signals help to stabilize heading in the body-centric coordinate system.
published_or_final_version
Psychology
Doctoral
Doctor of Philosophy
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Gough, William Dennis. "Automated Flow Path Design Optimization Using Mesh Morphing." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2843.

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The use of CAD models and CFD analysis has become an essential part of fluid flow design. To reduce the time spent determining a design, optimization frameworks have been implemented to automate the process. Mesh morphing has been implemented within these frameworks to further reduce the time needed. While optimization methods have been developed to optimize a fluid flow path, the optimum design needs to be recreated in a CAD model. A method has been developed which eliminates the need to recreate the optimal results in CAD. This is accomplished by using mesh morphing, CAD and CFD together in an optimization framework. The method developed has been implemented with a significant time savings over the use of a traditional meshing optimization framework.
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Shukla, Ankur. "Image Based Flow Path Recognition for Chromatography Equipment." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392105.

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The advancement in computer vision field with the help of deep learning methods is significant. The increase in computational resources, have lead researchers developing solutions that could help them in achieving high accuracy in image segmentation tasks. We performed segmentation of different types of objects in the chromatography instruments used in GE Healthcare, Uppsala. In this thesis project, we investigated methods in Computer vision and deep learning to segment out the different type of objects in instrument image. For a machine to automatically learn the features directly from instrument image, a deep convolutional neural network was implemented based on a recently developed existing architecture. The dataset was collected and preprocessed before using it with the neural network model. The model was trained with two different architecture Unet and Segnet developed for image segmentation. Both the used architecture is efficient and suitable for semantic segmentation tasks. Among different components to segment out in the instrument, there was a thin pipe. Unet was able to achieve good results while segmenting thin pipes with fewer data as well. Results show that Unet can act as a suitable architecture for segmenting different objects in an instrument even if we have only 100 images. Further advances can be done to improve the performance of the model by generating a better mask of the model and finding a way to collect more data for training the model.
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Ryu, Seungkyu. "Modeling Transportation Planning Applications via Path Flow Estimator." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4225.

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The Path Flow Estimator (PEE) concept was originally developed to estimate path flows (hence origin-destination flows) and link flows for a whole road network (given some counts at selected roads). It is now further developed as an alternative for modeling different transportation planning applications: (1) a bicycle network analysis tool for non-motorized transportation planning, (2) a multi-class traffic assignment model for freight planning, and (3) a simplified travel demand forecasting framework for small community planning. The first application of the redeveloped PFE is to develop a two-stage bicycle traffic assignment model for estimating/predicting bicycle volumes on a transportation network. The first stage considers key criteria (e.g., distance related attributes, safety related attributes, air quality related attributes etc.) to generate a set of non-dominated (or efficient) paths, while the second stage adopts several traffic assignment methods to determine the flow allocations to the network. This two-stage approach can be used as a stand-alone bicycle traffic assignment to the transportation network given a bicycle origin-destination (O-D) matrix. The second application aims to enhance the realism of traffic assignment models for freight planning by incorporating different modeling considerations into the multi-class traffic assignment problem. These modeling considerations involve developing both model formulation and customized solution algorithm, which in turn involve asymmetric interactions among different vehicle types (i.e., cars versus trucks), a path-size logit (PSL) model (for accounting random perceptions of network conditions with explicit consideration of route overlapping), and various traffic restrictions imposed either individually or together to multiple vehicle types in a transportation network. In the third application, a simplified planning framework is developed to perform planning applications in small communities where limited planning resources hinder the development and application of a full four-step model. Two versions (i.e., base year and future year) of the PFE are proposed to address the specific transportation planning issues and needs of small communities. These new PFE developments for planning applications are tested with different realistic transportation networks. The results suggest that the new PFE applications proposed in this dissertation provide an alternative to the traditional four-step travel demand forecasting model that can be used as a stand-alone application with better modeling capability and fewer resources.
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Sólyom, Péter. "The effect of flow path geometry on landscape evolution." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422439.

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Jackson, George Andrew. "Multiple path ultrasonic flow measurement techniques : theory and practice." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232944.

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Jhunjhunwala, Manish. "Multiphase flow and control of fluid path in microsystems." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/37456.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, February 2005.
Includes bibliographical references.
Miniaturized chemical-systems are expected to have advantages of handling, portability, cost, speed, reproducibility and safety. Control of fluid path in small channels between processes in a chemical/biological network is crucial for connecting process elements. We show complete separation of individual phases (phase routing) from two-phase gas-liquid and liquid-liquid (aqueous-organic) mixtures on microscale. To provide for robust interfacing of operations in a network, we demonstrate this ability over a wide range of two-phase flow conditions, including transient ones. Enabled by the technique for complete separation of individual phases from two-phase mixtures, we show mixing of liquids by introduction of a passive gas-phase and demonstrate integration of mixing, reaction and phase separation on a single platform. Additionally, we use the principles developed for phase routing to design microfluidic valves that do not rely on elastic deformation of material. Such valves can be used in a variety of chemical environments, where polymer-based deformable materials would fail.
(cont.) We show a concept for realization of logic-gates on microscale using appropriate connections for these valves, paving the way for design of automation and computational control directly into microfluidic analysis without use of electronics. Further, we use the phase separation concept for sampling liquid from gas-liquid and liquid-liquid mixtures. Such sampling ability, when coupled with a suitable analysis system, can be used for retrieving process information (example mass-transfer coefficients, chemical kinetics) from multiphase-processes. We provide evidence of this through estimation of mass-transfer coefficients in a model oxygen-water system and show at least an order-of-magnitude improvement over macroscale systems. Controlled definition of fluid path enabled by laminar flow on microscale is used in a large number of applications. We examine the role of gravity in determining flow path of fluids in a microchannel. We demonstrate density-gradient-driven flows leading to complete reorientation of fluids in the gravitational field.
(cont.) We provide estimates of the time and velocity scales for different parameter ranges through two-dimensional and three-dimensional finite-element models, in agreement with experimental observations. We believe this thesis addresses a number of both: system and fundamental issues, advancing applications and understanding of microfluidic networks.
by Manish Jhunjhunwala.
Ph.D.
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Poletto, Massimiliano Antonio. "Path splitting--a technique for improving data flow analysis." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/35028.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
Includes bibliographical references (p. 83-87).
by Massimiliano Antonio Poletto.
M.Eng.
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Chen, Ying Chih. "Visualizing Load Path in Perforated Shear Walls." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7609.

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Shear walls are the primary lateral load resisting elements in bearing wall systems used in masonry construction. Horizontal loads due to wind or earthquake are transferred to vertical walls by diaphragms that are rigid such as concrete floor slabs or flexible such as wood floors. With rigid diaphragms, loads are apportioned to the supporting walls based on their relative rigidity. Walls with openings accommodating doors and windows (“perforated walls”) have reduced rigidity that can be determined using available hand calculation methods. These methods primarily focus on analysis procedures, not on the visualization of the load path that is critically important in structural engineering practice. The analogy of springs in series or parallel is used to determine the equivalent stiffness of elastic systems in structural dynamics. This thesis uses this analogy to develop a method that can help visualize load flow in perforated shear walls connected to rigid diaphragms. Rigidities are calculated using existing methods and combined as springs in series or parallel to represent a perforated wall. Loads taken by the wall segments correspond to the electrical current flowing through this imaginary “circuit”. To help visualize the load path, the line drawing representation of springs in series or parallel and the applied lateral load are deliberately oriented in the vertical direction. The application of the analogy is illustrated by several numerical examples of varying complexity taken from text books. Finite element solutions are included in the comparisons to provide a measure of the relative accuracy of hand calculation methods. The analogy can be extended to refine existing hand calculation methods though this increases computational effort. It improves accuracy but only for cases where the aspect ratio of the wall segments is such that shear effects are dominant.
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Kaya, Mustafa. "Path Optimization Of Flapping Airfoils Based On Unsteady Viscous Flow Solutions." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609349/index.pdf.

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The flapping path of a single airfoil and dual airfoils in a biplane configuration is optimized for maximum thrust and/or propulsive efficiency. Unsteady, low speed viscous flows are computed using a Navier-Stokes solver in a parallel computing environment. A gradient based algorithm and Response Surface Methodology (RSM) are employed for optimization. The evaluation of gradient vector components and the design of experiments for RSM, which require unsteady solutions, are also carried out in parallel. Parallel computations are performed using Parallel Virtual Machine (PVM) library. First, a single airfoil undergoing a combined sinusoidal or non-sinusoidal pitching and plunging motion is studied. The non-sinusoidal flapping motion is described using an elliptic curve or Non-Uniform Rational B-Splines (NURBS). It is shown that the thrust generation may significantly be increased in comparison to the sinusoidal flapping motion. For a high thrust, the airfoil stays at high effective angle of attack values during the upstroke and the downstroke, and the effective pitching occurs at minimum and maximum plunge positions. Secondly, the optimization of sinusoidal and non-sinusoidal flapping paths of dual airfoils is considered. Moving and deforming overset grids are used for computations. The deforming overset grids remove the restrictions on the flapping motion, and improve the optimization results obtained earlier. At low flapping frequencies, an airfoil in a biplane configuration produces more thrust than a single airfoil. Yet, at high frequencies the airfoil in biplane configuration produces less thrust at a significantly lower efficiency than the single airfoil.
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Books on the topic "Path flow"

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Shafer, John M. GWPATH: Interactive ground-water flow path analysis. Champaign, Ill: Illinois State Water Survey Division, 1987.

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McArdle, Jack G. Effects of flow-path variations on internal reversing flow in a tailpipe offtake configuration for ASTOVL aircraft. [Washington, DC: National Aeronautics and Space Administration, 1993.

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McArdle, Jack G. Effects of flow-path variations on internal reversing flow in a tailpipe offtake configuration for ASTOVL aircraft. [Washington, DC: National Aeronautics and Space Administration, 1993.

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McArdle, Jack G. Effects of flow-path variations on internal reversing flow in a tailpipe offtake configuration for ASTOVL aircraft. [Washington, DC: National Aeronautics and Space Administration, 1993.

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McArdle, Jack G. Effects of flow-path variations on internal reversing flow in a tailpipe offtake configuration for ASTOVL aircraft. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Hanover, Robert H. Analysis of ground-water flow along a regional flow path of the Midwestern Basins and Arches Aquifer System in Ohio. Columbus, Ohio: U.S. Geological Survey, 1994.

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Hanover, Robert H. Analysis of ground-water flow along a regional flow path of the Midwestern Basins and Arches Aquifer System in Ohio. Columbus, Ohio: U.S. Geological Survey, 1994.

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Hanover, Robert H. Analysis of ground-water flow along a regional flow path of the Midwestern Basins and Arches Aquifer System in Ohio. Columbus, Ohio: U.S. Geological Survey, 1994.

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Chmielniak, Tadeusz. SYMKOM'99: International conference compressor & turbine stage flow path theory, experiment & user verification. Łódź: Politechnika Łʹodzka, Instytut Maszn Przeoływowych, 1999.

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Plummer, L. Niel. An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH. Reston, Va: Dept. of the Interior, U.S. Geological Survey, 1991.

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Book chapters on the topic "Path flow"

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Kim, K. H., and J. M. A. Tanchoco. "Reachability in material flow path design." In Material Flow Systems in Manufacturing, 159–76. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2498-4_6.

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Winter, Kirsten, Chenyi Zhang, Ian J. Hayes, Nathan Keynes, Cristina Cifuentes, and Lian Li. "Path-Sensitive Data Flow Analysis Simplified." In Formal Methods and Software Engineering, 415–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41202-8_27.

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Deshpande, Paritosh C., and Arron W. Tippett. "Application of Material Flow Analysis: Mapping Plastics Within the Fishing Sector in Norway." In Business Transitions: A Path to Sustainability, 175–83. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-22245-0_17.

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AbstractPlastic in our marine environment is now ubiquitous. Abandoned lost or otherwise discarded fishing gear (ALDFG) is of particular concern due to its ability to continue to function as a trap for marine organisms. In order for decision makers to act on this grave issue, we require data on the flow of ALDFG into the marine environment. One key tool for revealing the flow of material within a specific system is Material Flow Analysis (MFA). MFA takes a life cycle approach (cradle to grave) to assess energy or material flows in a system within space and time boundaries. It can be applied at multiple levels from the industrial process level to the national level. This chapter presents a case study of an MFA conducted on fishing gear in Norway. The MFA methodology was used in this case study to assess the flow of plastic fishing gear from production through to recycling, final disposal or loss to the marine environment. Data was collected for the MFA through stakeholder interviews, literature reviews and analysis of government data sets. The MFA revealed that around 4000 tons of plastic fishing gear enters the system in Norway and around 400 tons enter the marine environment each year. An analysis of the implications of the MFA for the key actors within the life cycle chain of fishing gear is presented and a short description of the links between MFA and the circular economy and sustainable development is provided. Furthermore, the relevance and implications of using MFA tool for policy making at national and regional level is discussed and elaborated while associated challenges are presented here.
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Indumathi, C. P., and A. Ajina. "Generating Feasible Path Between Path Testing and Data Flow Testing." In Evolutionary Computing and Mobile Sustainable Networks, 325–35. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5258-8_32.

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Hunt, Allen, Robert Ewing, and Behzad Ghanbarian. "Specific Examples of Critical Path Analysis." In Percolation Theory for Flow in Porous Media, 131–56. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03771-4_5.

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Hunt, Allen, and Robert Ewing. "Specific Examples of Critical Path Analysis." In Percolation Theory for Flow in Porous Media, 97–122. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89790-3_4.

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G. Hunt, Allen. "Specific Examples of Critical Path Analysis." In Percolation Theory for Flow in Porous Media, 67–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11430957_3.

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Taghdiri, Mana, Gregor Snelting, and Carsten Sinz. "Information Flow Analysis via Path Condition Refinement." In Lecture Notes in Computer Science, 65–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19751-2_5.

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Yu, Jingjin, and Steven M. LaValle. "Multi-agent Path Planning and Network Flow." In Springer Tracts in Advanced Robotics, 157–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36279-8_10.

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Rieger, N. F. "Flow Path Excitation Mechanisms for Turbomachine Blades." In CISM International Centre for Mechanical Sciences, 423–52. Vienna: Springer Vienna, 1988. http://dx.doi.org/10.1007/978-3-7091-2846-6_17.

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Conference papers on the topic "Path flow"

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Rojas, Elisa, Guillermo Ibanez, Diego Rivera, and Juan A. Carral. "Flow-Path: An AllPath flow-based protocol." In 2012 IEEE 37th Conference on Local Computer Networks (LCN 2012). IEEE, 2012. http://dx.doi.org/10.1109/lcn.2012.6423619.

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Scaringe, R. P. "Flow Path and Flow Reversal Algorithms for SimTooltm." In 22nd Intersociety Energy Conversion Engineering Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 1987. http://dx.doi.org/10.2514/6.1987-9391.

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Barbar, Mohamad, Yulei Sui, Hongyu Zhang, Shiping Chen, and Jingling Xue. "Live path control flow integrity." In ICSE '18: 40th International Conference on Software Engineering. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3183440.3195093.

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Bodík, Rastisalv, and Sadun Anik. "Path-sensitive value-flow analysis." In the 25th ACM SIGPLAN-SIGACT symposium. New York, New York, USA: ACM Press, 1998. http://dx.doi.org/10.1145/268946.268966.

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Li, Peixuan, and Danfeng Zhang. "Towards a Flow- and Path-Sensitive Information Flow Analysis." In 2017 IEEE 30th Computer Security Foundations Symposium (CSF). IEEE, 2017. http://dx.doi.org/10.1109/csf.2017.17.

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Yadav, Nikita, and Vinod Ganapathy. "Whole-Program Control-Flow Path Attestation." In CCS '23: ACM SIGSAC Conference on Computer and Communications Security. New York, NY, USA: ACM, 2023. http://dx.doi.org/10.1145/3576915.3616687.

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Thakur, Aditya, and R. Govindarajan. "Comprehensive path-sensitive data-flow analysis." In the sixth annual IEEE/ACM international symposium. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1356058.1356066.

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Chun, Sejong. "Calculation of the Flow Profile Correction Factor Based on Flow Velocity Distribution Functions for Ultrasonic Flow Metering." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4679.

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Abstract Transit-time ultrasonic flow metering relies on the flow profile correction factor (FPCF) to improve its measurement capability by converting line-integrated flow velocity into area-integrated flow velocity. It is because the flow velocity is integrated along ultrasonic paths between ultrasonic sensors by sending and receiving pulse signals in the transit-time ultrasonic flow metering. ISO 12242 (liquid flow metering) and ISO 17089 (gas flow metering) specify how to define the FPCF with a transit-time multi-path ultrasonic flow meter. The FPCF is applied to an averaged value of line-integrated flow velocities, not to each line-integrated flow velocity, according to the ISO standards. The present use of FPCF is validated in the fully-developed turbulent pipe flow, which a long straight pipe is installed upstream of the ultrasonic flow meter. However, the present FPCF would not be very accurate in asymmetric pipe flows with various conduit elements, such as elbows. This study attempts to apply the FPCF to each line-integrated flow velocity in transit-time multi-path ultrasonic flow metering. The FPCF can be applied to each line-integrated flow velocity if the FPCF is based on flow velocity distribution functions, such as those suggested by Salami (1984). The Salami’s flow velocity distribution functions include one symmetric flow, three one-peak flows, and two two-peak flows. The FPCF is calculated by line-integrals along the ultrasonic paths on each flow velocity distribution function. This study is the first attempt to show that the FPCF can be applied to convert the line-integrated flow velocities into the area-integrated flow velocity along each ultrasonic path.
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Kang, Weijia, Zhansheng Liu, Zhixuan Cao, Le Wang, and Gangwei Wang. "Numerical Research on Flow Characteristics of Inlet Flow-Path for Ram-Rotor." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68210.

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A design method of ram-rotor inlet flow-path with shock wave compression is proposed with consideration of shock wave angle, plane turning angle, the inlet flow-path throat, and subsonic diffuser. A 3D model of the inlet flow path for ram-rotor is established by applying this design method. Effects of the back pressure, rotational speed and flow-path structure on the structure of shock wave and flow-path field distribution are numerically analyzed. The simulation results indicate that the inlet compression efficiency and thermal efficiency of rotating ramjet engine are improved with the increment of exit back pressure when the inlet flow-path operates normally. But along with the increase of rotational speed, the change trends of pressure ratio and compression efficiency are opposite. Reasonable compromise is needed in improving the rotating speed of ram-rotor. In addition, the constant length should also be guaranteed in the throat of inlet flow-path, where a relatively stable shock train forms.
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Jalbert, Paul A., and Robert S. Hiers. "Mach Flow Angularity Probes for Scramjet Engine Flow Path Diagnostics." In Aerospace Technology Conference and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/932551.

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Reports on the topic "Path flow"

1

Parker, Gary. Reaction Evolution Flow Chart - The Critical Path to DDT. Office of Scientific and Technical Information (OSTI), January 2024. http://dx.doi.org/10.2172/2282509.

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2

Hopper, R. W. Surface path lines in plane stokes flow driven by capillarity. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/10182958.

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Dhody, D., A. Farrel, and Z. Li. Path Computation Element Communication Protocol (PCEP) Extension for Flow Specification. RFC Editor, January 2022. http://dx.doi.org/10.17487/rfc9168.

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4

Arnold, B. W., S. J. Altman, and T. H. Robey. Unsaturated-zone fast-path flow calculations for Yucca Mountain groundwater travel time analyses (GWTT-94). Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/125424.

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Hawley, Owston, and Thorson. PR-015-13610-R01 Effect of Upstream Piping Configuration on Ultrasonic Meter Bias - Flow Validation. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2014. http://dx.doi.org/10.55274/r0010033.

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This research demonstrated the ability of a Computational Fluid Dynamics (CFD) modeling approach to predict the severity of velocity profile disturbances in two different header configurations with AGA-9 default meter runs. The CFD model was also used to predict the flow measurement error based on the ultrasonic path geometry from four commercially-available ultrasonic flow meters. In addition to the CFD modeling, this project experimentally tested the same two header configurations in a natural gas flow loop. The results from the experimental testing were used to validate the CFD model.
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Rans, Richard. PR-352-15600-Z01 USM Uncertainty Estimate From Diagnostics. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2020. http://dx.doi.org/10.55274/r0010919.

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A method to calculate a common set of Ultrasonic meter Gaussian quadrature �0.809R/�0.309R velocity diagnostics has been developed for multi-path Ultrasonic meters with Gaussian and proprietary path configurations. An uncertainty model has been developed using the changes between the meter's �0.809R/�0.309R calibration velocity diagnostics and the meter's �0.809R/�0.309R first flow/recalibration velocity diagnostics to estimate a Maximum Gaussian Risk/Probable Gaussian Risk calibration transfer uncertainty.
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Piyush Sabharwall, Matt Ebner, Manohar Sohal, and Phil Sharpe. Molten Salts for High Temperature Reactors: University of Wisconsin Molten Salt Corrosion and Flow Loop Experiments -- Issues Identified and Path Forward. Office of Scientific and Technical Information (OSTI), March 2010. http://dx.doi.org/10.2172/980798.

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George and Delgado. PR-015-06601-R01 Evaluation of Clamp-on Ultrasonic Meters as Field-Portable Diagnostic Tool. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2007. http://dx.doi.org/10.55274/r0010702.

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This study has continued work begun in 2005 to evaluate the use of commercially-available clamp-on ultrasonic meters (USMs) in diagnosing natural gas flow conditions that can produce measurement errors in traditional natural gas meters. In this project, a prototype multi-array clamp-on USM and a commercially available two-path clamp-on USM were mounted on a conventional orifice meter run with a 19-tube bundle flow straighter subjected to well-conditioned flow and a series of adverse flow conditions. Measurements from the clamp-on meters were compared to measurements from the orifice meter under adverse conditions. The objectives of the study were to determine the ability of the clamp-on meters to diagnose abnormal flow conditions that can produce measurement errors in conventional orifice meter configurations, identify the flow profiles within the meter run, and quantify the orifice meter measurement error.
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Hall, Zanker, and Kelner. PR-343-06605-R02 USM Recalibration Frequency. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2009. http://dx.doi.org/10.55274/r0010155.

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This program is intended to improve the understanding of the stability over time of gas multi-path ultrasonic flow meters (USMs). Within the Natural Gas Industry, there are currently on universal standards requiring periodic recalibration of USMs. Removing these flow meters from serviced for recalibration is costly and inconvenient. However, the primary reason that a recalibration standard does not exist is the lack of definitive data regarding the long-term stability of installed USMs. In order to address this situation, collection and analysis of data was performed to help formulate a recalibration guideline. Specific tasks include: (1) review and utilization of existing published technical papers, (2) working with certified flow calibration facilities to obtain data, (3) obtaining data from USM manufactures on changing of electronics and/or transducers, (4) obtaining historical recalibration data, and (5) participation in selected recalibrations by PRCI member companies.
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Grimley, Hart, and Viana. PR-015-07604-R01 Clamp-On Ultrasonic Flow Meters as Diagnostic Tools. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), June 2008. http://dx.doi.org/10.55274/r0011006.

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Over the past several years, improvements in clamp-on ultrasonic meter technology have caused increased interest in applying this technology within the natural gas industry. Clamp-on ultrasonic meters (CUSMs), which are mounted on the outside of a pipe, send and receive ultrasonic waveforms through the pipe wall. This configuration offers several potential advantages over in-line meters, including portability and the ability to be installed without shutdown and disassembly of the pipeline. CUSMs, like their in-line counterparts, use sophisticated electronics to control the meter operation and to monitor parameters such as transducer signal strength, path velocities, and speed of sound. Because of these features, CUSMs are being considered for their potential as in-situ verification and as diagnostic tools. Having such portable tools to quickly verify meter performance would save considerable time in troubleshooting causes of lost and unaccounted-for (LAUF) gas, thus, minimizing overall LAUF totals. The ability to validate meter performance in-situ would also significantly reduce operating and maintenance costs of metering stations, particularly costs of unnecessary recalibrations. This project specifically addressed the ability of a CUSM to measure distorted profiles with sufficient resolution to determine if the flow is properly conditioned for flow measurement by other meter types. It also addressed the accuracy with which CUSM measurements, performed with sufficient spatial fidelity, can be used to provide a reference flow rate for in-situ meter proving. The test approach was to traverse a single ultrasonic transducer pair around the perimeter of the pipe in sufficiently small increments to measure the flow field at a given pipe cross section independent of the amount of flow distortion present. Velocity profile measurements performed at the same locations were used as an independent check of the CUSMs profile sensitivity.
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