Academic literature on the topic 'Recirculation loop'

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Journal articles on the topic "Recirculation loop"

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Kim, Jaeheun, and Choongsik Bae. "Emission reduction through internal and low-pressure loop exhaust gas recirculation configuration with negative valve overlap and late intake valve closing strategy in a compression ignition engine." International Journal of Engine Research 18, no. 10 (2017): 973–90. http://dx.doi.org/10.1177/1468087417692680.

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An investigation was carried out to examine the feasibility of replacing the conventional high-pressure loop/low-pressure loop exhaust gas recirculation with a combination of internal and low-pressure loop exhaust gas recirculation. The main objective of this alternative exhaust gas recirculation path configuration is to extend the limits of the late intake valve closing strategy, without the concern of backpressure caused by the high-pressure loop exhaust gas recirculation. The late intake valve closing strategy improved the conventional trade-off relation between nitrogen oxides and smoke em
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Gautier, N., J. L. Aider, T. Duriez, B. R. Noack, M. Segond, and M. Abel. "Closed-loop separation control using machine learning." Journal of Fluid Mechanics 770 (April 10, 2015): 442–57. http://dx.doi.org/10.1017/jfm.2015.95.

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We present the first closed-loop separation control experiment using a novel, model-free strategy based on genetic programming, which we call ‘machine learning control’. The goal is to reduce the recirculation zone of backward-facing step flow at $\mathit{Re}_{h}=1350$ manipulated by a slotted jet and optically sensed by online particle image velocimetry. The feedback control law is optimized with respect to a cost functional based on the recirculation area and a penalization of the actuation. This optimization is performed employing genetic programming. After 12 generations comprised of 500 i
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Alekseev, É. I., E. N. Bazarov, V. P. Gubin, V. G. Kovalenko, A. I. Sazonov, and N. I. Starostin. "Recirculation fiber loop interferometer with a Faraday reflector." Technical Physics Letters 28, no. 11 (2002): 949–51. http://dx.doi.org/10.1134/1.1526893.

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Araiza-Martínez, Enrique, Javier Ortiz-Villafuerte, and Rogelio Castillo-Durán. "A detailed BWR recirculation loop model for RELAP." Nuclear Engineering and Design 311 (January 2017): 1–8. http://dx.doi.org/10.1016/j.nucengdes.2016.11.006.

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Markina, L. M., N. Yr Zholobenko, and S. Yr Ushcats. "Investigation of the influence of the physicochemical characteristics of waste on the quality of liquid fuel products from them, obtained by multi-loop recirculation pyrolysis." Journal of Achievements in Materials and Manufacturing Engineering 1, no. 106 (2021): 20–33. http://dx.doi.org/10.5604/01.3001.0015.0526.

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Purpose: To study the properties of MSW generated in Ukraine in order to ensure their most efficient processing using the multi-loop recirculation pyrolysis technology in order produce a liquid fuel product. Design/methodology/approach: The problem' study of MSW accumulation in the world countries was carried out on the basis scientific databases PubMed, ScienceDirect, Mendeley, ResearchGate, Google Scholar for the corresponding keywords. The MSW properties generated in Ukraine were determined in accordance with the current standards to determine the specific properties of materials. For the e
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Liu, Yu, and Shibao Wu. "Proposed Scheme for Ultra-Flat Optical Frequency Comb Generation Based on Dual-Drive Mach–Zehnder Modulators and Bidirectional Recirculating Frequency Shifting in Single Loop." Photonics 9, no. 8 (2022): 514. http://dx.doi.org/10.3390/photonics9080514.

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Recirculating frequency shifting has attracted much attention for its advantages in the generation of the flexible and high-quality optical frequency comb. A new scheme of ultra-flat optical frequency comb generation system based on single-loop bidirectional recirculating frequency shift is proposed and studied in this paper. The generation system employs two pairs of dual-drive Mach–Zehnder modulators and several polarization devices. Compared with the method of single-loop unidirectional recirculation frequency shift, under the same cycles, the number of comb lines generated by the proposed
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Braun, D., and W. Gujer. "Reactive tracers reveal hydraulic and control instabilities in full-scale activated sludge plant." Water Science and Technology 57, no. 7 (2008): 1001–7. http://dx.doi.org/10.2166/wst.2008.210.

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The hydraulic characteristics of aeration tanks in WWTPs have a major impact on the degradation of pollutants, as well as on the control of the aeration. In particular in long reactors, which are not separated by baffles, hydraulic shortcuts or large scale recirculation can lead to a loss of performance. This work demonstrates that reactive tracers such as ammonium and oxygen can be used to investigate the hydraulics of aeration tanks in detail. With the use of electrochemical sensors it is possible to investigate effects in a broad range of time scales. In the present case study a slow oscill
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van Benthum, W. A. J., R. G. J. M. van der Lans, M. C. M. van Loosdrecht, and J. J. Heijnen. "Bubble recirculation regimes in an internal-loop airlift reactor." Chemical Engineering Science 54, no. 18 (1999): 3995–4006. http://dx.doi.org/10.1016/s0009-2509(99)00097-4.

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Sheintuch, Moshe, and Olga Nekhamkina. "Comparison of flow-reversal, internal-recirculation and loop reactors." Chemical Engineering Science 59, no. 19 (2004): 4065–72. http://dx.doi.org/10.1016/j.ces.2004.04.037.

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Kalmani, S. D., A. V. Joshi, G. Majumder, N. K. Mondal, and R. R. Shinde. "Design validation and performance of closed loop gas recirculation system." Journal of Instrumentation 11, no. 11 (2016): C11026. http://dx.doi.org/10.1088/1748-0221/11/11/c11026.

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Dissertations / Theses on the topic "Recirculation loop"

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Haber, Benjamin. "A Robust Control Approach on Diesel Engines with Dual-Loop Exhaust Gas Recirculation Systems." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1274191066.

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de, Souza Althea Caroline. "The use of computational fluid dynamics to simulate the flow in a high recirculation airlift reactor." Thesis, University of Portsmouth, 2000. https://researchportal.port.ac.uk/portal/en/theses/the-use-of-computational-fluid-dynamics-to-simulate-the-flow-in-a-high-recirculation-airlift-reactor(2dd55384-1826-4ef9-8f01-3b6f8e86aaee).html.

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Sutherland, Erika Susanne. "Analysis of the performance and stability of a passive recirculation loop for hydrogen delivery to a PEM fuel cell system." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/443.

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Proton Exchange Membrane (PEM) fuel cells are becoming an increasingly important alternative to combustion engines as the fossil fuel reserves are depleted. Several papers have presented steady state analyses of the system, but few are known to present dynamic analysis of the flow and control of the hydrogen delivery process. This thesis presents the dynamic analysis of hydrogen delivery to a PEM fuel cell system. The hydrogen is delivered to the anode with use of an ejector for passive recirculation. The system to be studied consists of the manifolds, ejector, and pressure control valve. Mode
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Le, Maout-Alvarez Coralie. "Étude expérimentale des effets chimiques sur le colmatage des filtres dans l’industrie nucléaire." Electronic Thesis or Diss., Université de Lorraine, 2023. http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2023_0015_ALVAREZ.pdf.

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Lors d'un accident de type APRP (Accident de Perte du Réfrigérant Primaire) survenant dans réacteur nucléaire à eau pressurisé (REP), des débris sont générés et ils peuvent être partiellement transportés jusqu'aux filtres des systèmes de secours RIS-EAS des puisards situés dans le fond de l'enceinte de confinement du réacteur. Ces débris peuvent contribuer au colmatage « physique » des filtres. Un autre effet dit « effet chimique » correspond à l'apport de cations en solution de par la corrosion des débris (fibres d'isolant) et la possible corrosion de surfaces métalliques présentes dans le bâ
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McCoy, Kenneth A. "A recirculating optical loop for short-term data storage." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/14871.

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Wijewardane, M. Anusha. "Exhaust system energy management of internal combustion engines." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/9829.

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Today, the investigation of fuel economy improvements in internal combustion engines (ICEs) has become the most significant research interest among the automobile manufacturers and researchers. The scarcity of natural resources, progressively increasing oil prices, carbon dioxide taxation and stringent emission regulations all make fuel economy research relevant and compelling. The enhancement of engine performance solely using incylinder techniques is proving increasingly difficult and as a consequence the concept of exhaust energy recovery has emerged as an area of considerable interest. Thr
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Guimpelson, Bronislav. "BWR coolant chemistry studies using a recirculating in-pile loop." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36949.

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Mikhailov, Vitaly. "Investigation of high-speed, wavelength-division-multiplexed (WDM) optical fibre transmission systems and devices using recirculating loop techniques." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406136.

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Battistini, Lorenzo. "Impact of future EU7 regulations on high performance gasoline-ICEs and possible innovative technologies for extension of lambda 1 operating range." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25674/.

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The aim of pollutant emissions legislation is to bring environmental benefit by helping reduce, for what road transport is responsible, the concentration of pollutants where levels are too high and endanger human health. Europe is considering several changes in “post Euro 6d” regulation from 2025. Several measures have been proposed for Euro 7, most of which introduce new challenges in the development of high-performance turbocharged gasoline engine such as the extension of lambda 1 in the whole engine map. In this Master Thesis, possible technologies to expand the engine operating range wit
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Zhang, Jiejun. "Photonic Dispersive Delay Line for Broadband Microwave Signal Processing." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35866.

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The development of communications technologies has led to an ever-increasing requirement for a wider bandwidth of microwave signal processing systems. To overcome the inherent electronic speed limitations, photonic techniques have been developed for the processing of ultra-broadband microwave signals. A dispersive delay line (DDL) is able to introduce different time delays to different spectral components, which are used to implement signal processing functions, such as time reversal, time delay, dispersion compensation, Fourier transformation and pulse compression. An electrical DDL is usuall
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Books on the topic "Recirculation loop"

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Holman, Garry S. Application of reliability techniques to prioritize BWR recirculation loop welds for in-service inspection. Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1989.

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Holland, John H. 4. Agents, networks, degree, and recirculation. Oxford University Press, 2014. http://dx.doi.org/10.1093/actrade/9780199662548.003.0004.

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‘Agents, networks, degree, and recirculation’ explains that when studying complex adaptive systems (CAS) in a grammar-like way, agents serve as the ‘alphabet’. The hierarchical organization of CAS implies different kinds of agents at different levels, with correspondingly different grammars. The interactions of signal-processing agents at a point in time can be specified by a network—a snapshot of the agents’ performance capability. The combination of high fanout (the richness of an agent’s interactions) and hierarchical organization results in complex networks that include large numbers of se
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Holland, John H. 7. Co-evolution and the formation of niches. Oxford University Press, 2014. http://dx.doi.org/10.1093/actrade/9780199662548.003.0007.

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What is a niche? ‘Co-evolution and the formation of niches’ explains that the term ‘niche’ is widely used to describe an important part of the hierarchical organization of complex adaptive systems: local use of signals and resources. Using Markov processes, a mathematical theory of niches can be formed that allows for multiple species with interaction networks that involve loops and recirculation. When realistic niches are considered, the diversity of the niche dwellers stands out. We see a complicated recirculation of resources and signals. How did this complex network of interactions evolve?
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Book chapters on the topic "Recirculation loop"

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Hsieh, Ying-Jiun, and Yavuz A. Bozer. "Analytical Modeling of Closed-Loop Conveyors with Load Recirculation." In Computational Science and Its Applications – ICCSA 2005. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11424925_47.

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Kalmani, S. D., Surya Mondal, R. R. Shinde, and P. V. Hunagund. "Some Studies Using Capillary for Flow Control in a Closed Loop Gas Recirculation System." In XXII DAE High Energy Physics Symposium. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_223.

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Prończuk, Mateusz, and Katarzyna Bizon. "The Influence of External Recirculation Loop Design on the Hydrodynamic Properties of a Hybrid Fluidized Bed Apparatus." In Practical Aspects of Chemical Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39867-5_36.

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Ivanov, Sergei I., Alexander P. Lavrov, Dmitrii V. Kondakov, and Yurij A. Matveev. "Fiber-Optic Recirculating Memory Loop for Wideband Microwave Signal." In Lecture Notes in Computer Science. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97777-1_22.

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Hamaide, J. P., B. Biotteau, F. Pitel, and E. Desurvire. "Soliton Wavelength-Division-Multiplexing Systems: From Numerical Design to Recirculating Loop Experiments." In Optical Solitons: Theoretical Challenges and Industrial Perspectives. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03807-9_10.

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Kondakov, Dmitrii V., Sergei I. Ivanov, and Alexander P. Lavrov. "A Broadband Analog Fiber-Optic Line with Recirculating Memory Loop for Variable Microwave Signal Delay." In Springer Proceedings in Physics. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-81119-8_53.

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Ben Amira, Bilel, Mariem Ammar, Ahmad Kaffel, Zied Driss, and Mohamed Salah Abid. "The Effects of Curved Blade Turbine on the Hydrodynamic Structure of a Stirred Tank." In Vortex Dynamics Theories and Applications. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92394.

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This work is aimed at studying the hydrodynamic structure in a cylindrical stirred vessel equipped with an eight-curved blade turbine. Flow fields were measured by two-dimensional particle image velocimetry (PIV) to evaluate the effect of the curved blade turbine. Velocity field, axial and radial velocity distribution, root mean square (rms) of the velocity fluctuations, vorticity, and turbulent kinetic energy were presented. Therefore, two recirculation loops were formed close to the free surface and in the bottom of the tank. Moreover, the highest value area of the vorticity is localized in
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Paschotta, R. "recirculating fiber loops." In RP Photonics Encyclopedia. RP Photonics AG, 2004. http://dx.doi.org/10.61835/aq4.

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Wang, Hao, and Luis A. Ricardez-Sandoval. "A Deep Reinforcement Learning PI Tuning Strategy for Closed-loop Operation of a Recirculating Aquaculture System." In Computer Aided Chemical Engineering. Elsevier, 2024. http://dx.doi.org/10.1016/b978-0-443-28824-1.50289-1.

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"Scott and Tabibi phase into the other by feeding it into the vicinity of the mixing/dispersing element. In this way, the phase being added is quickly dispersed into the continuous phase. Although it is widely accepted that the higher the shear rate produced by the mixer the smaller the droplets and, hence, the more stable the emulsion, there is a major prob-lem that must be avoided if good results are to be obtained with high-speed mixing equipment. Every effort should be made to avoid incorporating air into the mix. Air forms a third phase that could ruin emulsion stability in a number of ways. Air usu-ally reduces the viscosity. The addition steps should be organized such that the impel-ler of the mixture is always submerged deeply enough to avoid surface turbulence or splashing. The arrangement of the mixer angle and/or baffles should avoid vortexing. Another alternative is to perform all of the emulsion-making steps in a vacuum-pro-cessing vessel. An additional method is to premix the components at low speeds and shear rates and then subsequently execute the high-shear portion of the process with in-line equipment in the absence of air. In short, aeration should be avoided. Sometimes the direct approach is not the most effective one. When one phase is first added to another, the small amount of liquid being added forms the internal phase. If more of this liquid is added there comes a point where the continuous phase loses its ability to hold all of the internal phase and the emulsion inverts to the opposite type, e.g., from O/W to W/O. Since it has been found that this practice (phase inversion) can yield small droplet sizes, this method is widely used in batch processing. To ex-ecute this maneuver, one needs to begin mixing with only a small amount of liquid in a batch that will later increase to usually more than four times the starting volume. Therefore, the mixer has to extend well to the bottom of the vessel. One way to avoid this small volume of starting liquid is by using an in-line mixer in a recirculation loop attached to the main mixing vessel as illustrated in Fig. 5. The initial phase is recirculated through the in-line high mixer and the phase to be inverted is then carefully metered directly into the recirculation line. This avoids Fig. 5 In-line mixer in recirculation loop to kettle." In Pharmaceutical Dosage Forms. CRC Press, 1998. http://dx.doi.org/10.1201/9781420000955-37.

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Conference papers on the topic "Recirculation loop"

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Hansen, Andrea, Alla Furman, and Rita Kharshan. "Anti-Corrosion Building Blocks for Open Recirculation Loop Cooling Systems." In CORROSION 2009. NACE International, 2009. https://doi.org/10.5006/c2009-09484.

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Abstract Cooling systems are crucial components of many processing and manufacturing plants. It is important to maintain these systems and keep them in good working condition. One problem faced during maintenance is corrosion. Corrosion mitigation is often time consuming and costly. The goal of this paper is to show the effectiveness and advantages of Vapor Phase Corrosion Inhibitors (VpCIs) in the protection of different metals of open recirculating loop cooling systems including copper and galvanized steel. VpCI materials discussed in this paper are environmentally friendly, and can be made
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Kessler, Stephen M. "Seawater Makeup for Open Recirculating Cooling Water Systems." In CORROSION 2000. NACE International, 2000. https://doi.org/10.5006/c2000-00352.

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Abstract Global fresh water shortages have forced many geographic locations to utilize seawater for industrial cooling. This is becoming increasingly prevalent especially in the Mediterranean and Persian Gulf areas. Because seawater is particularly corrosive to most metallurgies commonly used in cooling water loops, i.e., carbon steel, copper and admiralty brass, seawater cooling systems are being designed with titanium metallurgy in order to eliminate corrosion concerns. However, cooling water treatments for these applications still require deposit control inhibitors to maintain loop integrit
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Miura, Yasufumi, Kenji Kako, Yuichi Miyahara, and Masaru Sato. "Effects of Plastic Strain and Stress Distribution on SCC Initiation in High Temperature Water." In CORROSION 2013. NACE International, 2013. https://doi.org/10.5006/c2013-02442.

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Abstract Stress corrosion cracking (SCC) has been occurred in boiling water reactor (BWR) components, such as reactor core shrouds and primary loop recirculation (PLR) pipes made of L-grade austenitic stainless steels, which are not thermally sensitized. SCC of reactor core shrouds and PLR pipes is generally initiated on work hardened surfaces. Therefore it is important to clarify the effect of work hardened surface layer on SCC initiation behavior. In this study, SCC initiation tests, x-ray stress measurements, hardness tests, and optical microscope observations were carried out in order to e
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Singh, Preet M., Jorge J. Perdomo, Jamshad Mahmood, and Pablo Conde. "Stress Assisted Corrosion Simulation in Laboratory." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04518.

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Abstract Stress Assisted Corrosion (SAC) of boiler tubes and economizer tubes from the waterside is one of the major problems in availability loss and safety of power plants and industrial boilers. Use of carbon steel for the service of high temperature water applications strongly depends upon formation and stability of the protective oxide film of magnetite, Fe3O4, on the waterside surface of boiler tubes. Failure mechanisms involved in waterside SAC surely includes film damage as an important step. To understand SAC, a recirculation loop autoclave facility for high temperature water testing
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Kondapi, Phaneendra Babu, and Janardhan Davalath. "Recirculation Loop Analysis for a Subsea Boosting System." In Offshore Technology Conference. Offshore Technology Conference, 2012. http://dx.doi.org/10.4043/23644-ms.

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Strazisar, Anthony J., Michelle M. Bright, Scott Thorp, Dennis E. Culley, and Kenneth L. Suder. "Compressor Stall Control Through Endwall Recirculation." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54295.

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Experiments that demonstrate the use of endwall recirculation to control the stall of transonic compressor stages are described. Endwall recirculation of a compressor stage is implemented by bleeding air from the casing downstream of a stator blade row and injecting the air as a wall jet upstream of a preceding rotor blade row. The bleed ports, injection ports, and recirculation channels are circumferentially discrete, and occupy only 20–30% of the circumference. The development of compact wall-jet injectors is described first. Next, the results of proof-of-concept steady recirculation tests o
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Hwang, Sheng-Dih, and Te-Chuan Wang. "Identify the Broken Loop and Break Sizes of Recirculation Line LOCA for a BWR6/MarkIII Plant." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16089.

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Abstract In this study, the MAAP5 code was used as the tool to simulate a reactor operated at steady-state and occurred an LOCA with different break sizes at the recirculation loops. A BWR6/MarkIII nuclear power plant (NPP) was selected as the sample deck. By detecting the temperature difference between the loops, and then the break size could be determined including which loop and how is the break size. Moreover, this study had also analyzed the effect of break sizes affecting the characteristic of an NPP. These results were consistent with the previous experiments and codes. This study also
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Vieth, Jonathan, Marcel Reith-Braun, Albert Bauer, et al. "Improving Accuracy of Optical Sorters Using Closed-Loop Control of Material Recirculation." In 2023 American Control Conference (ACC). IEEE, 2023. http://dx.doi.org/10.23919/acc55779.2023.10156014.

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James A Hardin, C L Jones, E L Bonjour, et al. "Ozone Fumigation of Stored Grain; Closed-loop Recirculation and Rate of Ozone Consumption." In 2009 Reno, Nevada, June 21 - June 24, 2009. American Society of Agricultural and Biological Engineers, 2009. http://dx.doi.org/10.13031/2013.27354.

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Haber, Benjamin, and Junmin Wang. "Robust Control Approach on Diesel Engines With Dual-Loop Exhaust Gas Recirculation Systems." In ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4135.

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This paper presents a robust control approach to achieve an independent control authority over the intake manifold conditions of a medium-duty, V8, Diesel engine with the use of a complex air-path system. The intake manifold conditions in question include gas temperature, pressure, and oxygen mass fraction. The purpose of achieving such a high control authority over these intake manifold conditions is to explore the possibilities of extending the operating ranges of advanced combustion modes like low temperature diffusion combustion (LTDC), homogenous charge compression ignition (HCCI), and pr
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Reports on the topic "Recirculation loop"

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Holman, G. Application of reliability techniques to prioritize BWR (boiling water reactor) recirculation loop welds for in-service inspection. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5193479.

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Willner, Allan E., and Paniz Ebrahimi. Using a Recirculating Fiber Loop to Determine the Limitations Placed on Ultra-High-Performance Soliton and Linear Optical Systems by Polarization Mode Dispersion. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada416674.

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Yin, Yan. Final Report: A Multi-Channel Recirculating Loop Signal Regenerator for High Frequency Single-Shot Bunch Length Measurement, August 13, 1998 - March 17, 1999. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/765220.

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