Relevant bibliographies by topics / Flow sampling

Contents

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

Academic literature on the topic 'Flow sampling'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Flow sampling"

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Williams, John G. "Sampling for Environmental Flow Assessments." Fisheries 35, no. 9 (2010): 434–43. http://dx.doi.org/10.1577/1548-8446-35.9.434.

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Wang, Xiaoming, Xiaoyong Li, and Dmitri Loguinov. "Modeling Residual-Geometric Flow Sampling." IEEE/ACM Transactions on Networking 21, no. 4 (2013): 1090–103. http://dx.doi.org/10.1109/tnet.2012.2231435.

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Liu, Yan. "Research of the Flow Sampling Algorithm." Advanced Materials Research 472-475 (February 2012): 2588–91. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2588.

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This article presents a flow measurement sampling method based on the application group, which identify the received message and then trasmit the identified packets to the corresponding application packet sample space, after this sampling each space packet independently. Thus to ensure the network to restore the situation in the application of fine-grained has lower error rate, thereby reducing the distortion of the application distribution.
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Duffield, Nick. "Fair sampling across network flow measurements." ACM SIGMETRICS Performance Evaluation Review 40, no. 1 (2012): 367–78. http://dx.doi.org/10.1145/2318857.2254800.

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Duffield, Nick, Carsten Lund, and Mikkel Thorup. "Flow sampling under hard resource constraints." ACM SIGMETRICS Performance Evaluation Review 32, no. 1 (2004): 85–96. http://dx.doi.org/10.1145/1012888.1005699.

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Cai, Qiu-liang, Lei Tong, Ning Zhong, Jie Zheng, Meng-meng He, and Hang Xiao. "Sampling efficiency of flow-through air sampler: Effect of sampling rate." Journal of Chromatography A 1738 (December 2024): 465474. http://dx.doi.org/10.1016/j.chroma.2024.465474.

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Aldroubi, Akram, Karlheinz Gröchenig, Longxiu Huang, Philippe Jaming, Ilya Krishtal, and José Luis Romero. "Sampling the Flow of a Bandlimited Function." Journal of Geometric Analysis 31, no. 9 (2021): 9241–75. http://dx.doi.org/10.1007/s12220-021-00617-0.

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AbstractWe analyze the problem of reconstruction of a bandlimited function f from the space–time samples of its states $$f_t=\phi _t*f$$ f t = ϕ t ∗ f resulting from the convolution with a kernel $$\phi _t$$ ϕ t . It is well-known that, in natural phenomena, uniform space–time samples of f are not sufficient to reconstruct f in a stable way. To enable stable reconstruction, a space–time sampling with periodic nonuniformly spaced samples must be used as was shown by Lu and Vetterli. We show that the stability of reconstruction, as measured by a condition number, controls the maximal gap between the spacial samples. We provide a quantitative statement of this result. In addition, instead of irregular space–time samples, we show that uniform dynamical samples at sub-Nyquist spatial rate allow one to stably reconstruct the function $$\widehat{f}$$ f ^ away from certain, explicitly described blind spots. We also consider several classes of finite dimensional subsets of bandlimited functions in which the stable reconstruction is possible, even inside the blind spots. We obtain quantitative estimates for it using Remez-Turán type inequalities. En route, we obtain Remez-Turán inequality for prolate spheroidal wave functions. To illustrate our results, we present some numerics and explicit estimates for the heat flow problem.
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Choi, Beak-Young, Jaesung Park, and Zhi-Li Zhang. "Adaptive packet sampling for flow volume measurement." ACM SIGCOMM Computer Communication Review 32, no. 3 (2002): 9. http://dx.doi.org/10.1145/571697.571698.

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Miliauskas, John. "Lymph node sampling for flow cytometric analysis." Pathology 34, no. 5 (2002): 481–82. http://dx.doi.org/10.1080/0031302021000009478.

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R. A. Kohl and C. G. Carlson. "VOLUMETRIC SAMPLING OF SOILWATER FLOW USING WICKS." Transactions of the ASAE 40, no. 5 (1997): 1373–76. http://dx.doi.org/10.13031/2013.21396.

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Dissertations / Theses on the topic "Flow sampling"

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Piao, Dongzhen. "Speeding Up Gibbs Sampling in Probabilistic Optical Flow." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/481.

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In today’s machine learning research, probabilistic graphical models are used extensively to model complicated systems with uncertainty, to help understanding of the problems, and to help inference and predict unknown events. For inference tasks, exact inference methods such as junction tree algorithms exist, but they suffer from exponential growth of cluster size and thus is not able to handle large and highly connected graphs. Approximate inference methods do not try to find exact probabilities, but rather give results that improve as algorithm runs. Gibbs sampling, as one of the approximate inference methods, has gained lots of traction and is used extensively in inference tasks, due to its ease of understanding and implementation. However, as problem size grows, even the faster algorithm needs a speed boost to meet application requirement. The number of variables in an application graphical model can range from tens of thousands to billions, depending on problem domain. The original sequential Gibbs sampling may not return satisfactory result in limited time. Thus, in this thesis, we investigate in ways to speed up Gibbs sampling. We will study ways to do better initialization, blocking variables to be sampled together, as well as using simulated annealing. These are the methods that modifies the algorithm itself. We will also investigate in ways to parallelize the algorithm. An algorithm is parallelizable if some steps do not depend on other steps, and we will find out such dependency in Gibbs sampling. We will discuss how the choice of different hardware and software architecture will affect the parallelization result. We will use optical flow problem as an example to demonstrate the various speed up methods we investigated. An optical flow method tries to find out the movements of small image patches between two images in a temporal sequence. We demonstrate how we can model it using probabilistic graphical model, and solve it using Gibbs sampling. The result of using sequential Gibbs sampling is demonstrated, with comparisons from using various speed up methods and other optical flow methods.
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Castledine, Andre J. "Investigation of the fluid flow around blunt body samplers." Thesis, University of Leeds, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305756.

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Wei, Jian. "Microcolumn field sampling and flow injection techniques for mercury speciation." Thesis, Sheffield Hallam University, 1993. http://shura.shu.ac.uk/20513/.

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Mercury is one of the most toxic heavy metals, and many serious incidents have resulted from mercury poisoning. The methylation of mercury and its amplification by marine life have aggravated this pollution problem. Studies over the last three decades have shown that the toxicity of mercury is related to chemical form. A basic aim of the research has been to devise new methodology for the measurement and speciation of mercury. Key points of the investigation reported were the literature review of methodologies and techniques for mercury speciation and the development of a novel manifold which incorporates microcolumns of sulphydryl cotton which have a relatively high affinity and selectivity for inorganic and / or organomercury, and to utilise a continuous flow procedure for mercury speciation based on flow injection-atomic fluorescence spectrometry. This new and novel system has been used for the determination and speciation of mercury in a variety of water samples. The other column packing materials, eg. xanthate cotton, activated alumina and 8-hydroxy-quiniline were also investigated. A further aspect of element speciation concerns the development of a field sampling technique using sulphydryl cotton columns. Sample collection and preconcentration using microcolumns at the site of sampling was successfully performed. Preliminary experiments indicated that the field sampling technique in combination with FIA-AFS was a robust and potentially useful speciation tool. Field surveys on mercury distribution and speciation in the Manchester Ship Canal and the River Rother have been intensively carried out in collaboration with the National Rivers Authority (North West Region). The analytical data on different mercury species in waters of the Manchester Ship Canal are reported for the first time. A high correlation between organomercury and organolead in the Manchester Ship Canal is found and the related data have been assessed in order to clarify the possible origins for organomercury. Related work concerning participation in interlaboratory studies is reported in the Appendices.
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Xillo, Olivier III. "A Sampling Probe for Fluctuating Concentration Measurements in Supersonic Flow." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36670.

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The study of mixing processes in supersonic flow has a great interest for a number of applications including scramjet developments. However, the usual tools employed are very limited. Sampling probes generally have a poor frequency response, and that makes measurements of fluctuating concentration problematic. The goal of this study is to design, build and test a probe capable of measuring concentration fluctuations of at least 1 kHz. This study shows the design of such a probe and how a high frequency response was achieved. A prototype was built and tested. The tests consist of a calibration phase and experiments inside a hypersonic wind tunnel. These last tests served two purposes. The first one was to verify that the measurements made with the probe gave the correct value of the concentration. The second purpose was to assess the frequency response of the probe by putting it through a concentration step change. Tests were conducted with various known mixtures of Helium and air from 0% to 100% flowing at Mach 2.0 with Tt=300 degree K and Pt=4.4 atm. The probe proved capable of measuring concentration fluctuations up to approximately 2.5 kHz while also giving the adequate accuracy for values of mean concentration.<br>Master of Science
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Leitch, Katherine McArthur. "Estimating Tributary Phosphorus Loads Using Flow-Weighted Composite Storm Sampling." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/10078.

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Quantification of total phosphorus (TP) loads entering a lake or reservoir is important because phosphorus is most often the limiting nutrient in terms of algae growth, thus phosphorus can control the extent of eutrophication. Four methods for assessing the annual tributary phosphorus loads to two different Virginia reservoirs were analyzed, three methods that use tributary monitoring program data and one that uses land-use and rainfall data. In this project, one tributary has been extensively monitored for many years and served as a control on which the other methods were tested. The key difference between this research and previous studies is the inclusion of flow-weighted composite storm sampling instead of simple grab sample analyses of storm flow. Three of the methods employed flow stratification, and the impact of the base flow separation point was examined. It was found that the Regression Method developed in this research was the least sensitive to the base flow separation point, which is a valuable attribute because a wrong choice will not significantly affect the estimate. The Monte Carlo Method was found to underestimate the TP loads. The amount of rainfall impacted the accuracy of the methods, with more error occurring in a year with lower precipitation.<br>Master of Science
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Cahn, Lorie Selma. "Development of guidelines for design of sampling programs to predict groundwater discharge." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26178.

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The objective of this study is to develop guidelines for the design of sampling programs to predict groundwater discharge. A method for choosing a preferred sampling strategy from a set of alternatives is presented. A framework is outlined, in the form of an objective function, that incorporates both the cost of collecting data and the worth of data. A monetary value is assigned to the worth of hydraulic conductivity data by examining the economic losses associated with the uncertainty in predictions of groundwater discharge. The method is applied to the problem of designing a sampling program that measures hydraulic conductivity for predicting discharge from a rapid infiltration pond. Hydraulic conductivity data are generated for hypothetical hill slopes using a stochastic finite element model. A set of sampling strategies are selected. For each sampling strategy, the value and location of measurements and the uncertainty in the spatial variation of hydraulic conductivity are incorporated using conditional simulations. Estimates of pond discharge are calculated from the stream function solution and compared to the actual value of pond discharge for the hypothetical site. The root mean square error is used to quantify the uncertainty in discharge predictions. A set of alternative sampling strategies are compared using the objective function. Prediction uncertainty, measured by the root mean square error, is sensitive to both the structure of the heterogeneities and the location of measurements. Sampling schemes that lead to good estimates of the ensemble mean and standard deviation will not necessarily lead to good predictions of discharge. The goal of sampling schemes should be to collect data in key locations of the flow domain and to identify the spatial variation in hydraulic conductivity in a cost effective manner. For predicting discharge from a rapid infiltration pond, locating one or two initial boreholes below the pond is the preferred strategy for a majority of the cases tested. When the measurements are spaced evenly throughout the flow domain, important shallow layers may be missed that have a large influence on pond discharge. Increasing the number of boreholes does not necessarily lead to more certain predictions of pond discharge or to lower values of the objective function. Considerable uncertainty in discharge predictions can exist even with a relatively large number of measurements. While an optimal strategy exists, there is potential for significant variation in prediction uncertainty at individual sites.<br>Science, Faculty of<br>Earth, Ocean and Atmospheric Sciences, Department of<br>Graduate
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Fernandez, Maria Luz Mena. "Field sampling and flow injection strategies for trace analysis and element speciation." Thesis, Sheffield Hallam University, 1997. http://shura.shu.ac.uk/19646/.

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Over the last two decades research has shown that the different forms of trace elements in the environment can cause a variety of health concerns as a result of differences in toxicity. The need to establish efficient, effective and reliable speciation methods has become paramount. A basic aim of this work has been to advance speciation measurement capability for key trace elements (mercury, lead and chromium) by devising an integrated analytical approach that links the sample collection, sample preservation and laboratory measurements in an unified manner. An introductory chapter first reviews the occurrence of organometallic compounds in the environment and focuses on the identification of the "environmental compartments" where transformations of such species can take place. Speciation studies also assist in understanding the biogeochemical cycling of trace elements. Moreover, a review of the various methodologies used for trace element speciation measurements including hyphenated techniques and/or a variety of chemical/physical pretreatments in combination with flow injection (FI) is discussed. Chapter 2 describes mercury speciation experiments utilising gas chromatography-microwave induced plasma-atomic emission spectrometry (GC-MIP-AES) and FI. The approach was based on the preconcentration of mercury on sulphydryl cotton and after elution from the microcolumn, separation and quantitation of methyl-, ethyl- and inorganic mercury species. Method development experiments were performed using a derivatisation technique which gave low contamination and allowed rapid analysis of samples. The microcolumn technique was transferred to the field and speciation of mercury in surface waters of the Manchester Ship Canal was undertaken and high methylmercury concentrations (0.052-0.182 ug 1 -1, as Hg) were detected. In so doing the new approach offered the preservation of the natural speciation state of the water sample directly at the sampling site and during the interval between collection and analysis. In chapter 3 lead studies are centred on the development of a rapid speciation scheme for neutral and cationic (organic and inorganic) lead species based on activated alumina microcolumn separation in combination with ICP-MS and FI. The approach permitted rapid assessment of the nature of lead contamination in environmental waters. Speciation of lead in surface waters of the Manchester Ship Canal was also undertaken using the field sampling approach in an attempt to confirm a transmethyllation reaction between organolead and inorganic mercury. A further application for microcolumns, in the context of speciation measurement, is their use as external calibrants and certified reference materials (CRMs) and this is discussed in the penultimate chapter. Key elements were mercury and chromium. After immobilisation of mercury species on SCF microcolumns it was found that recoveries for methyl- and inorganic mercury were quantitative over 4 months in contrast to ethylmercury which was 2 months. Similar studies for chromium species indicated ineffective elution and more vigorous conditions (microwave assisted digestion) for the elution step were used. A final chapter reviews progress and recommendations are given concerning future research and application for microcolumn field sampling in combination with instrumental analytical techniques.
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Murray, Jacolin Ann. "High Flow Air Sampling for Field Detection Using Gas Chromatography-Mass Spectrometry." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2414.

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The ability to rapidly detect and identify hazardous analytes in the field has become increasingly important. One of the most important analytical detection methods in the field is gas chromatography-mass spectrometry (GC-MS). In this work, a hand-portable GC-MS system is described that contains a miniature toroidal ion trap mass analyzer and a low thermal mass GC. The system is self-contained within the dimensions of 47 x 36 x 18 cm and weighs less than 13 kg. Because the instrument has a small footprint, it was used as the detector for an automated near-real-time permeation testing system. In permeation testing, materials that are used to make individual protective equipment such as gloves, masks, boots, and suits are exposed to hazardous analytes to determine how long the equipment can be worn safely. The system described herein could test five samples simultaneously. A multi-position valve rotated among the various sample streams and delivered time aliquots into the MS for quantitation. Current field air sampling techniques suffer from long desorption times, high pressure drops, artifact formation and water retention. These disadvantages can be avoided by concentrating the analytes in short open tubular traps containing thick films. There are several advantages to using polymer coated capillaries as traps, including fast desorption, inertness and low flow restriction. An air sampling trap was constructed utilizing open tubular traps for the concentration of semi-volatile organic compounds. The system consisted of multiple capillary traps bundled together, providing high sample flow rates. The analytes were desorbed from the multi-capillary bundle and refocused in a secondary trap. The simultaneous focusing and separation effect of a trap subjected to a negative temperature gradient was also explored. In this configuration, analytes were focused because the front of the peak was at a lower temperature than the rear of the peak and, hence, moved slower. In addition to the focusing effect, analytes with different volatilities focused at different temperatures within the gradient, allowing for separation.
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Rheinberg, Falko, Regina Vollmeyer, and Stefan Engeser. "Die Erfassung des Flow-Erlebens." Universität Potsdam, 2003. http://opus.kobv.de/ubp/volltexte/2006/634/.

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Ausgehend von einer Charakterisierung des Flow-Erlebens als gaenzliches Aufgehen in einem glatt laufenden Taetigkeitsvollzug, den man trotz hoher Beanspruchung noch unter Kontrolle hat, wird auf die Erfassung dieser Motivationskomponente eingegangen. Dargestellt und diskutiert werden Vor- und Nachteile der bisherigen qualitativen (Interviews) und quantitativen Flow-Erfassung (Experience Sampling Method (ESM)) . Ausfuehrlicher wird eine "Flow-Kurzskala" (FKS) beschrieben, die mit zehn Items alle qualitativ verschiedenen Komponenten des Flow-Erlebens oekonomisch und reliabel erfasst. Sie liefert einen Gesamtwert sowie Werte fuer zwei Subskalen (glatter automatisierter Verlauf sowie Absorbiertheit). Daneben erfassen drei zusaetzliche Items die Besorgnis in der aktuellen Situation. Berichtet werden Vergleichskennwerte aus punktuellen Messungen und ESM-Studien. Die hoechsten Werte fuer Flow und Besorgnis wurden bislang bei Graffiti-Sprayern gefunden. Bei einer intellektuell herausfordernden Aufgabe (Postkorbuebung) sind die FKS-Werte mit der Hoffnung-auf-Erfolg-Komponente des Leistungsmotivs korreliert. Furcht-vor-Misserfolg korreliert dagegen mit dem Besorgniswert der FKS. Flow waehrend der Bearbeitung von Uebungsaufgaben fuer Statistik lieferte einen signifikanten Beitrag zur Vorhersage der nachfolgenden Klausurleistung. Dieser Beitrag blieb erhalten, auch wenn Faehigkeitsmasse kontrolliert wurden. (Buch/A.G. - ZPID)
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Singh, Rohitendra Kumar. "A study of air flow in a network of pipes used in aspirated smoke detectors." full-text, 2009. http://eprints.vu.edu.au/15172.

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Thesis (M. Eng.)--Victoria University (Melbourne, Vic.), 2009.<br>Submitted in fulfilment of the requirements for the degree of Master of Engineering in Mechanical Engineering. Includes bibliographical references.
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Books on the topic "Flow sampling"

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Puls, Robert W. Low-flow (minimal drawdown) ground-water sampling procedures. U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, 1996.

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J, Barcelona Michael, and United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response., eds. Low-flow (minimal drawdown) ground-water sampling procedures. U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, 1996.

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J, Barcelona Michael, and United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response, eds. Low-flow (minimal drawdown) ground-water sampling procedures. U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, 1996.

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J, Barcelona Michael, and United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response, eds. Low-flow (minimal drawdown) ground-water sampling procedures. U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, 1996.

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J, Barcelona Michael, and United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response., eds. Low-flow (minimal drawdown) ground-water sampling procedures. U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, 1996.

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J, Barcelona Michael, and United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response, eds. Low-flow (minimal drawdown) ground-water sampling procedures. U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, 1996.

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J, Barcelona Michael, and United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response., eds. Low-flow (minimal drawdown) ground-water sampling procedures. U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response, 1996.

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Vinson, Robert P. Airflow evaluations of four-flow-controlled personal sampling pumps. U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Puls, Robert W. Colloidal-facilitated transport of inorganic contaminants in ground water. U.S. Environmental Protection Agency, Robert S. Kerr Environmental Research Laboratory, 1990.

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Puls, Robert W. Colloidal-facilitated transport of inorganic contaminants in ground water. U.S. Environmental Protection Agency, Robert S. Kerr Environmental Research Laboratory, 1990.

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Book chapters on the topic "Flow sampling"

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Yoshida, Hideto, and Hisao Makino. "Particle Sampling in Gas Flow." In Powder Technology Handbook. CRC Press, 2019. http://dx.doi.org/10.1201/b22268-69.

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Iske, Armin. "Adaptive Irregular Sampling in Meshfree Flow Simulation." In Sampling, Wavelets, and Tomography. Birkhäuser Boston, 2004. http://dx.doi.org/10.1007/978-0-8176-8212-5_11.

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Larson, Reed, and Mihaly Csikszentmihalyi. "The Experience Sampling Method." In Flow and the Foundations of Positive Psychology. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9088-8_2.

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Doh, D. H., T. Kobayashi, T. Saga, and H. Kanamori. "Introduction of a Conditional Sampling to Particle-Imaging Velocimetry." In Flow Visualization VI. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_160.

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Csikszentmihalyi, Mihaly, and Reed Larson. "Validity and Reliability of the Experience-Sampling Method." In Flow and the Foundations of Positive Psychology. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9088-8_3.

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Csikszentmihalyi, Mihaly, and Jeremy Hunter. "Happiness in Everyday Life: The Uses of Experience Sampling." In Flow and the Foundations of Positive Psychology. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9088-8_6.

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Bartos, Karel, and Martin Rehak. "Towards Efficient Flow Sampling Technique for Anomaly Detection." In Traffic Monitoring and Analysis. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28534-9_11.

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Chen, L. H., B. K. Zheng, and X. Y. Chang. "Gas sampling/analysis of the high enthalpy supersonic flow." In Shock Waves. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-27009-6_147.

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Zhang, Boyu, Yang Du, He Huang, et al. "Multi-layer Adaptive Sampling for Per-Flow Spread Measurement." In Algorithms and Architectures for Parallel Processing. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95384-3_46.

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Rajba, Paweł, and Mieczysław Wodecki. "Sampling Method for the Flow Shop with Uncertain Parameters." In Computer Information Systems and Industrial Management. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59105-6_50.

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Conference papers on the topic "Flow sampling"

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Kanwar, Gurtej. "Flow-based sampling for lattice field theories." In The 40th International Symposium on Lattice Field Theory. Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.453.0114.

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Esmaeilian, Soroosh, Mahdi Dolati, Sogand Sadrhaghighi, and Majid Ghaderi. "Coordinated Sampling in SDNs with Dynamic Flow Rates." In 2024 20th International Conference on Network and Service Management (CNSM). IEEE, 2024. https://doi.org/10.23919/cnsm62983.2024.10814381.

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Groose, J. E., B. W. Weiss, R. D. Muelenkamp, and D. M. Lempke. "Trends in Water Sampling Technology for Evaluating Corrosion in Steam Generating Systems." In CORROSION 1993. NACE International, 1993. https://doi.org/10.5006/c1993-93043.

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Abstract Sample flow, temperature, and pressure are easily controlled under constant conditions. Since typical electric power demands are not constant, many plants cycle the operating pressure to match the power demand. This dramatic change in source pressure requires attention to ensure flows and heat loads to the coolers and, eventually to analyzers, are not excessive. A new automatic sampling system continuously controls individual sample flow rates by measuring the flow rate and adjusting the motorized pressure control device to maintain constant flow without manual operator adjustment. This automatic sampling system also senses scaling and plugging of the sampling line and pressure control valve and adjusts the valve to maintain constant flow. By maintaining a constant flow rate, the automated system permits unattended representative sampling. Automatic blowdown or startup can be performed by the automatic sampling system for boiler startup conditions. Results from field trails are presented. The basic operation, system process, and instrument diagrams are shown. The features and benefits of an automatic sample conditioning system for cycling and base load plants are discussed.
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Wang, Xiaoming, Xiaoyong Li, and Dmitri Loguinov. "Modeling residual-geometric flow sampling." In IEEE INFOCOM 2011 - IEEE Conference on Computer Communications. IEEE, 2011. http://dx.doi.org/10.1109/infcom.2011.5934980.

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Yang, Y., and D. Telionis. "Design and testing of instrumentation for multi-phase flow sampling and local void fraction measurement." In MULTIPHASE FLOW 2013. WIT Press, 2013. http://dx.doi.org/10.2495/mpf130261.

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Walk, Philipp, Peter Jung, and Babak Hassibi. "Constrained blind deconvolution using Wirtinger flow methods." In 2017 International Conference on Sampling Theory and Applications (SampTA). IEEE, 2017. http://dx.doi.org/10.1109/sampta.2017.8024425.

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Song, Jin, Chao Chen, Yiping Liu, and Haiyang Li. "Investigation on Sampling Flow Rate Calibration Method of Air Sampler." In 19th International Flow Measurement Conference 2022. IMEKO, 2023. http://dx.doi.org/10.21014/tc9-2022.145.

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Duffield, Nick, Carsten Lund, and Mikkel Thorup. "Flow sampling under hard resource constraints." In the joint international conference. ACM Press, 2004. http://dx.doi.org/10.1145/1005686.1005699.

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Duffield, Nick. "Fair sampling across network flow measurements." In the 12th ACM SIGMETRICS/PERFORMANCE joint international conference. ACM Press, 2012. http://dx.doi.org/10.1145/2254756.2254800.

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Ansari, Emaad, Mohammad Nishat Akhtar, Elmi Abu Bakar, et al. "Steady flow based mechanized sampling actuator for Sungai Kerian sediment sampling application." In ADVANCES IN FRACTURE AND DAMAGE MECHANICS XX. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0157603.

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Reports on the topic "Flow sampling"

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Sekar, Vyas, Michael K. Reiter, Walter Willinger, and Hui Zhang. Coordinated Sampling: An Efficient, Network-Wide Approach for Flow Monitoring. Defense Technical Information Center, 2007. http://dx.doi.org/10.21236/ada477015.

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Ballinger, Marcel Y., John A. Glissmeyer, J. Matthew Barnett, Kurtis P. Recknagle, and Satoru T. Yokuda. Sampling Point Compliance Tests for 325 Building at Set-Back Flow Conditions. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1015905.

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George and Grant. PR-015-14609-R01 Study of Sample Probe Minimum Insertion Depth Requirements. Pipeline Research Council International, Inc. (PRCI), 2015. http://dx.doi.org/10.55274/r0010844.

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Probes for natural gas sample collection and analysis must extend far enough into the pipeline to avoid contaminants at the pipe wall, but must not be so long that there is a risk of flow-induced resonant vibration and failure. PRCI has sponsored a project to determine the minimum probe depth for obtaining a representative single-phase gas sample in flows with small amounts of contaminants. To this end, Phase 1 of the project involved a review of existing literature and industry standards to identify key probe design parameters. Several current standards for sampling clean, dry natural gas were reviewed, and their requirements for sample probe dimensions and mounting arrangements were compared. Some of these standard requirements suggested probe designs and sampling approaches that could be used to collect gas-only samples from two-phase flows. A literature review identified many useful studies of two-phase flows and phase behavior. While few of these studies evaluated probe designs, the majority examined the behavior of gas and liquid in two-phase flows, methods of predicting flow regimes, and methods of predicting flow conditions that define the minimum probe depth for gas-only samples in gas-liquid flows. Useful recommendations were provided for selecting general probe features where liquids must be rejected from the gas sample. A basic design procedure was also provided to select the minimum sample probe insertion length and optimum installation position for known flow conditions. Plans to test the recommendations and the design procedure in Phase 2 of the project were also discussed. This report has a related webinar.
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Boschi, E., L. Mark, and B. Claise. Reducing Redundancy in IP Flow Information Export (IPFIX) and Packet Sampling (PSAMP) Reports. RFC Editor, 2009. http://dx.doi.org/10.17487/rfc5473.

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Grimley, Terry. PR-015-17610-Z01 Effects of Changing Gas Composition on Flow Measurement Error. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011583.

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The influence of measurement errors in gas composition on the energy flow measurement was examined for flow meters based on differential pressure (e.g., orifice, Venturi, and cone), linear volumetric meters (e.g., turbine and ultrasonic), and mass flow meters (e.g., Coriolis). The purpose of this analysis was to develop a process that could be used to assess the requirements for gas composition accuracy and sampling rate to meet a given overall target accuracy in energy flow measurement. Includes associated spreadsheets. There is also a related webinar. ?
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Muenz, G., B. Claise, and P. Aitken. Configuration Data Model for the IP Flow Information Export (IPFIX) and Packet Sampling (PSAMP) Protocols. RFC Editor, 2012. http://dx.doi.org/10.17487/rfc6728.

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George, Darin, and Christopher Grant. PR-015-15601-R01 Pulsation Effects on Ultrasonic Meters Phase II. Pipeline Research Council International, Inc. (PRCI), 2016. http://dx.doi.org/10.55274/r0010905.

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Transmission and storage operations frequently move natural gas using reciprocating compressors that may generate flow pulsations. Most measurement systems cannot accurately measure the flow rate of a pulsating gas stream, and the resulting errors can cause inaccurate gas volumes and accounting imbalances. A previous PRCI research project tested whether recent advances in ultrasonic meters may allow them to function without measurement error in pulsating flows. This project expanded on the previous work and tested similar ultrasonic meters to look for relationships between ultrasonic meter transducer sampling rates, the frequency and amplitudes of pulsations from reciprocating compressors, and meter accuracy. Diagnostics and flow data were collected from the meters and analyzed, and a useful relationship was found between the pulsation conditions and the meter measurement error. The findings were used to recommend a basis for installing ultrasonic meters in gas pipelines with varying pulsations. Additional testing evaluated a fast-response differential pressure transducer connected across a plate flow conditioner as a potential pulsation diagnostic tool.
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George and Hawley. PR-015-12600-R01 Ability of Ultrasonic Meters to Measure Accurately in Compressor-Induced Pulsating Flows. Pipeline Research Council International, Inc. (PRCI), 2013. http://dx.doi.org/10.55274/r0010808.

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Transmission and storage operations frequently move natural gas using reciprocating compressors that may generate flow pulsations. Most measurement systems cannot accurately measure the flow rate of a pulsating gas stream, and the resulting errors can cause inaccurate gas volumes and accounting imbalances. Recent advances in ultrasonic meters may provide the ability to function without measurement error in pulsating gas streams. Tests were performed to examine the relationship between ultrasonic meter transducer sampling rates, the frequency and amplitude of pulsations from reciprocating compressors, and meter accuracy as a possible basis for using ultrasonic meters in gas pipelines with varying pulsations. Two ultrasonic natural gas meters of current design were tested at SwRI in flows that simulated reciprocating compressor pulsations. Diagnostics and flow data were collected from the meters and analyzed to identify pulsation conditions in which the meters read accurately, or in which meter data could be used to correct measurement errors.
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Lagus, P. L., and R. A. Grot. PR-221-9215-R01 Manufacture Pre-Production Gas Flow Measurement System. Pipeline Research Council International, Inc. (PRCI), 1995. http://dx.doi.org/10.55274/r0011966.

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Measurement of the throughput of a natural gas compressor can be undertaken using a constant flow tracer dilution technique. In this technique, a constant flow of tracer is introduced into the piping upstream of the compressor while samples of diluted tracer are measured downstream of the compressor. The samples are analyzed using a specially configured analyzer. Knowledge of the injection rate and injection concentration coupled with the downstream measurement of tracer concentration allows the throughput through the compressor to be calculated. Under this contract, three systems were fabricated and were to be provided to operating pipeline companies for use and evaluation. Each system consisted of an SF6 analyzer, a high-pressure SF6 tracer injection module, and a gas sampling and analyzer support module. The design was modified based on the findings from the field evaluation and a final inspection.
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Britt, Sanford, James Martin-Hayden, and Mitchell A. Plummer. An Assessment of Aquifer/Well Flow Dynamics: Identification of Parameters Key to Passive Sampling and Application of Downhole Sensor Technologies. Defense Technical Information Center, 2014. http://dx.doi.org/10.21236/ada621876.

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