Bibliografias temáticas / Self-flux

Literatura científica selecionada sobre o tema "Self-flux"

Autor: Grafiati

Publicado: 25 de maio de 2024

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Artigos de revistas sobre o assunto "Self-flux"

Pistinner, S. L., e D. Eichler. "Self-inhibiting heat flux". Monthly Notices of the Royal Astronomical Society 301, n.º 1 (novembro de 1998): 49–58. http://dx.doi.org/10.1046/j.1365-8711.1998.01770.x.

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Castaño, Diego J., e Teresa M. Castaño. "Self-inductance and magnetic flux". American Journal of Physics 91, n.º 8 (1 de agosto de 2023): 622–28. http://dx.doi.org/10.1119/5.0098417.

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The canonical equation for self-inductance involving magnetic flux is examined, and a more general form is presented that can be applied to continuous current distributions. We attempt to clarify and extend the use of the standard equation by recasting it in its more versatile form.

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Morel, J. E., e J. M. McGhee. "A Self-Adjoint Angular Flux Equation". Nuclear Science and Engineering 132, n.º 3 (julho de 1999): 312–25. http://dx.doi.org/10.13182/nse132-312.

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Lukin, Vyacheslav S. "Self-organization in magnetic flux ropes". Plasma Physics and Controlled Fusion 56, n.º 6 (10 de março de 2014): 060301. http://dx.doi.org/10.1088/0741-3335/56/6/060301.

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Ga, E. M., D. Son, J. G. Bak e S. G. Lee. "Drift Self-compensating Type Flux-meter for Automatic Magnetic Flux Measurement". Journal of Magnetics 8, n.º 4 (1 de dezembro de 2003): 160–63. http://dx.doi.org/10.4283/jmag.2003.8.4.160.

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Mints, R. G., e Ilya Papiashvili. "Self-generated magnetic flux inYBa2Cu3O7−xgrain boundaries". Physical Review B 62, n.º 22 (1 de dezembro de 2000): 15214–20. http://dx.doi.org/10.1103/physrevb.62.15214.

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Cademartiri, Ludovico, Alessandra Sutti, Gianluca Calestani, Chiara Dionigi, Petr Nozar e Andrea Migliori. "Flux-Assisted Self-Assembly of Monodisperse Colloids". Langmuir 19, n.º 19 (setembro de 2003): 7944–47. http://dx.doi.org/10.1021/la034485r.

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Zhou, Pengbo, Guangtong Ma, Yuke Deng, Xingchao Nie, Yao Zhai, Kang Liu, Han Zhang e Yongjian Li. "A Contactless Self-Regulating HTS Flux Pump". IEEE Transactions on Applied Superconductivity 30, n.º 4 (junho de 2020): 1–6. http://dx.doi.org/10.1109/tasc.2020.2978787.

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Okada, Yohji, Masashi Kitagou, Toru Masuzawa e Masato Enokizono. "Development of Flux Concentrated type Self-Bearing Motor". IFAC Proceedings Volumes 43, n.º 18 (2010): 461–66. http://dx.doi.org/10.3182/20100913-3-us-2015.00010.

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Pla, Oscar, e Franco Nori. "Self-Organized Critical Behavior in Pinned Flux Lattices". Physical Review Letters 67, n.º 7 (12 de agosto de 1991): 919–22. http://dx.doi.org/10.1103/physrevlett.67.919.

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Teses / dissertações sobre o assunto "Self-flux"

Xu, Feng. "Self-excited oscillations of flexible-channel flow with fixed upstream flux". Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14135/.

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Self-excited oscillations in a collapsible-tube flow driven by fixed upstream flux have been observed by numerical and laboratory experiments. In this thesis we attempt to understand the mechanism of onset of these oscillations by focusing on a reduced physical model. We consider flow in a finite-length planar channel, where a segment of one wall is replaced by a membrane under longitudinal tension. The upstream flux and downstream pressure are prescribed and an external linear pressure distribution is applied to the membrane such that the system admits uniform Poiseuille flow as a steady solution. We describe the system using a one-dimensional model that accounts for viscous and fluid inertial effects. We perform linear stability analysis and weakly nonlinear analysis on the one-dimensional model, the resulting predictions are tested against two-dimensional Navier–Stokes numerical simulation. When the membrane has similar length to the rigid segment of channel downstream of the membrane, we find that in a narrow parameter regime we consider “mode-2” oscillations (i.e. membrane displacements with two extrema) are largely independent of the downstream segment but are driven by divergent instabilities of two non-uniform steady configurations of the membrane. When the downstream segment is much longer than the membrane, our analysis reveals how instability is promoted by a 1:1 resonant interaction between two modes, with the resulting oscillations described by a fourth-order amplitude equation. This predicts the existence of saturated sawtooth oscillations, which we reproduce in full Navier–Stokes simulations of the same system. In this case, our analysis shows some agreements with experimental observations, namely that increasing the length of the downstream tube reduces the frequency of oscillations but has little effect on the conditions for onset. We also use linear stability analysis to show that steady highly-collapsed solutions, constructed by utilizing matched asymptotic expansions, are very unstable, which allows the possibility that they are a precursor to slamming motion whereby the membrane becomes transiently constricted very close to the opposite rigid wall before rapidly recovering.

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Jacobi, Christoph, e Daniel Mewes. "Heat flux classification of CMIP5 model results using self-organizing maps". Universität Leipzig, 2019. https://ul.qucosa.de/id/qucosa%3A74181.

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We used the self-organizing maps (SOMs) method on eight models that participated in the Coupled model intercomparison project phase 5 (CMIP5) and two different greenhouse gases (GHG) concentration experiments. The SOMs were created from the winter 500 hPa horizontal temperature flux for each model. The clustering by the SOM revealed that in addition to the three flux pathways found in reanalyses (Pacific, Atlantic and Siberian/continental pathway), superpositions of these occur for the free running climate models, which develop their dynamic more freely than the reanalyses. It was found that the general structure of fluxes is indirectly dependent on the GHG concentrations, as the derived results from SOM patterns are different between the two GHG concentrations. It is suggested that flux patterns change from stable cyclonic motion over the north pole to flux pathways that feature more meridional fluxes through the North Atlantic and North Pacific into the Arctic.
Die Methode der Self-Organizing Maps (SOMs) wurde auf acht CMIP5-Modelle mit jeweils zwei verschiedenen Treibhausgasszenarien angwendet. Die SOMs wurden für jedes Modell und jede der beiden Modelläufe für den horizontalen Temperaturfluss in 500 hPa im Winter erstellt. Zusätzlich zu den aus der Analyse von Reanalyse-Daten erwarteten drei Transportwegen (pazifisch, atlantisch und sibirisch/kontinental) wurden Überlagerungen dieser gefunden. Es konnte gezeigt werden, dass die grundsätzliche Struktur der Transporte indirekt abhängig von der Treibhausgaskonzentration ist. Die Ergebnisse deuten darauf hin, dass sich die generelle Struktur des atmosphärischen Transports von einer stabilen zyklonalen Bewegung über dem Nordpol sich zu Transporten verschiebt, welche meridionale Transporte über den Nortdatlantik und den Nordpazifik in die Arktis führen.

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Liao, Yong Wei. "Self-excitation and constant flux operation of induction generators in stand-alone applications". Thesis, Liverpool John Moores University, 1998. http://researchonline.ljmu.ac.uk/5029/.

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Schmidt, Ryan Michael. "Magnetic Nanoparticle Field Directed Self-Assembly: Magnetic Flux Line Mapping and Block Copolymer Driven Assembly". University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1306332238.

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Baummer, Thomas Buchanan. "A self-contained cold plate utilizing force-fed evaporation for cooling of high-flux electronics". College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7795.

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Thesis (M.S.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Sinha, Ray Proshun. "Forest fires and flux avalanches : self organised criticality and other emergent aspects of two non equilibrium systems". Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271557.

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Lehto, Heather L. "Self-Potential Anomalies and CO2 Flux on Active Volcanoes: Insights from Time and Spatial Series at Masaya, Telica, and Cerro Negro, Nicaragua". [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002108.

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Norscini, Claudia. "Self-organized turbulent transport in fusion plasmas". Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4076.

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Barrières de transport (TB) sont un élément clé dans le contrôle de transport turbulent et atteindre la haute performance des ‘plasmas brûlants’. Les études théoriques abordent l’autorégulation de la turbulence comme une explication possible pour la formation de TB, mais une compréhension complète de ces dynamiques complexes est toujours manquante. Dans ce contexte, nous abordons l’auto-organisation dans le transport turbulent dans les plasmas de fusion dans le but de présenter une nouvelle compréhension de la dynamique des TB. Les outils numériques que nous utilisons des simulations de portée de la turbulence gyrocinétique plus complexe à simple turbulence des fluides 2D et prédateur-proie comme modèles.Deux principales caractéristiques de l'auto-organisation, les avalanches et les flux zonal (ZF), semblent contrôler transport à grande échelle. Dans la région de SOL (Scrape Off layer), événements avalancheux intermittents ne permettent pas séparation d'échelle dans le temps ou l'espace entre champs moyens et les modalités de fluctuation. Dans le bord (edge), la génération des doubles couches de cisaillement dans les profils de vitesse réduit le transport turbulent. Un modèle turbulent 2D pour la génération de ‘piedestal’, qui est non spécifique des plasmas de tokamak, a été mis au point, le piedestal étant localisée à l'interface entre les régions a différent amortissement d'écoulement zonal: edge et SOL. Les événements de relaxation quasi-périodiques sont étudiés réduisent le modèle à trois couplage des modes pour identifier l'interaction entre les streamers et les ZF et le rôle du Reynolds stress dans la génération et la saturation du TBs
Transport barriers (TB) are a key element in controlling turbulent transport and achieving high performance burning plasmas. Theoretical studies are addressing the turbulence self-regulation as a possible explanation for transport barrier formation but a complete understanding of such complex dynamics is still missing. In this context, we address self-organized turbulent transport in fusion plasmas with the aim of presenting a novel understanding of transport barriers dynamics. The numerical tools we use span simulations from the most complex gyrokinetic turbulence to simpler 2D fluid turbulence and predator-prey like models.Two features of self-organizations, avalanches and zonal flows (ZFs), appear to control large scale transport. In the SOL (Scrape Off Layer) , intermittent avalanche events do not allow for time or space scale separation between mean fields and fluctuation terms. In the edge, the generation of long living double shear layers in the profiles of the velocity reduces radial turbulent transport. Such radially distributed barriers govern profile corrugations. A 2D turbulent model for pedestal generation, which is not specific of Tokamak plasmas, has been developed, the pedestal being localized at the interface between regions with different zonal flow damping: the edge region, where zonal flows are weakly damped by collisions, and the SOL region characterized by zonal flow damping due to boundary conditions. Quasi-periodic relaxation events are studied reducing the model to three modes coupling to identify the interplay between streamers and ZFs and the role of Reynolds stress in the generation and saturation of TBs

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PESCETTO, PAOLO. "Sensorless Commissioning and Control of High Anisotropy Synchronous Motor Drives". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2730183.

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Abushammala, Haneen. "Tuning the multiorbital Mott transition of BaCoS2". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS100.

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Dans cette thèse nous ajustons la phase d’isolant de Mott du BaCoS2, un modèle multiorbital pour l’étude des corrélations électroniques. Nous avons développer une nouvelle technique de self-flux afin de produire des cristaux de qualité et de taille supérieures. Puis nous avons confirmé une phase stable orthorhombique Cmma à l’ambiante où la distorsion orthorhombique est concomitante à l’établissement d’un ordre AFM de longue portée. Ensuite, nous avons exploré la possibilité d’induire un état métallique dans du BaCoS2 via pression chimique et dopage électronique comme paramètres de contrôle. Pour cela, nous avons appliqué des techniques HP pour synthétiser des échantillons de Ba1−xSrxCoS2 et Ba1−xKxCoS2 avec x allant jusqu’à 0,07. On s’attend à ce que la substitution partielle du Ba par du Sr ou du K induise de la pression chimique ou du dopage de trous respectivement, favorisant ainsi une phase métallique dans les deux cas
In this thesis we tune the Mott insulating phase of BaCoS2, a playground for the study of electronic correlations in a multiorbital system. We first developed a novel self-flux technique to grow single crystals of improved quality and size. We then confirmed a stable orthorhombic Cmma phase at ambient conditions where the orthorhombic distortion is concomitant to a long-range AFM order, suggesting a scenario of orbital ordering that stabilises this order. Next, we explored the possibility of inducing a metallic state in BaCoS2 using chemical pressure and electronic doping as control parameters. For this goal, we successfully applied HP technique to the synthesis of Ba1−xSrxCoS2 and Ba1−xKxCoS2 samples with x up to 0.07. The partial substitution of Ba for Sr or K is expected to produce chemical pressure or hole-doping, respectively, thus favouring a metallic phase in both cases. We find that both substitutions induce similar structural changes, and a full suppression of the orthorhombic distortion and of the AFM order. However, no indication of metallic properties is found in the Ba1−xSrxCoS2 samples. However, a sizeable value of Sommerfeld coefficient,γ= 5.7mJ mol−1K−2 is found at 7% of K-substitution suggesting a metallic state induced by hole doping

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Livros sobre o assunto "Self-flux"

Price, Deborah Ann. Self-shielded flux-cored electrode arc-welding. Birmingham: University of Birmingham, 1988.

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Center, Lewis Research, ed. Remote heat flux using a self calibration multiwavelength pyrometer and a transparent material. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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1934-, Lin C. S., Van Dresar Neil T e United States. National Aeronautics and Space Administration., eds. Self-pressurization of a flightweight liquid hydrogen storage tank subjected to low heat flux. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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Dresar, Neil T. Van. Self-pressurization of a flightweight liquid hydrogen tank: Effects of fill level at low wall heat flux. [Washington, DC]: National Aeronautics and Space Administration, 1992.

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1934-, Lin C. S., Hasan Mohammad M e United States. National Aeronautics and Space Administration., eds. Self-pressurization of a flightweight liquid hydrogen tank: Effects of fill level at low wall heat flux. [Washington, DC]: National Aeronautics and Space Administration, 1992.

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United States. National Aeronautics and Space Administration., ed. REMOTE HEAT FLUX USING A SELF CALIBRATION MULTIWAVELENGTH PYROMETER AND A TRANSPARENT MATERIAL... NASA/TM-1998-208809... MAR. 1, 1999. [S.l: s.n., 1999.

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P, Guo W., e United States. National Aeronautics and Space Administration., eds. A self-consistent numerical magnetohydrodynamic (MHD) model of helment streamer and flux-rope internactions: Initiation and propagation of coronal mass ejections (CMEs). [Washington, D.C: National Aeronautics and Space Administration, 1997.

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Capítulos de livros sobre o assunto "Self-flux"

Yumoto, Takashi, Satoru Kishida, Heizo Tokutaka, Kikuo Fujimura, Seiichiro Nakashima e Taizo Tanigawa. "Growth of Bi2Sr2CaCu2Oy Single Crystals by Self Flux Method". In Advances in Superconductivity VII, 805–8. Tokyo: Springer Japan, 1995. http://dx.doi.org/10.1007/978-4-431-68535-7_182.

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Wang, Kaili, e Xuebing Han. "Self-study Control of Blast Furnace Material Flux Valve". In Communications in Computer and Information Science, 413–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16339-5_55.

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Buhari-Gulmez, Didem. "“Crisis” and Crimean Tatars: Discourses of Self-determination in Flux". In Crisis and Change in Post-Cold War Global Politics, 203–24. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78589-9_9.

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Yamazaki, Masato, Takashi Kasashima, Katsuya Yamagiwa, Takeshi Mitsuoka e Kazushige Ohbayashi. "Characteristic Design of Microwave Dielectric Materials by Using Self-Flux Compositions". In Electroceramics in Japan VIII, 109–12. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-982-2.109.

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McLamore, Eric S., D. Marshall Porterfield e Yinglang Wan. "Measuring Spatial and Temporal Oxygen Flux Near Plant Tissues Using a Self-Referencing Optrode". In Methods in Molecular Biology, 267–81. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7292-0_23.

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Katayama, Makoto, Satoru Kishida, Heizo Tokutaka, Katsumi Nishimori, Naganori Ishihara e Takashi Yumoto. "The Preparation of High Quality Bi-Sr-Ca-Cu-O Single Crystals by a Self Flux Method". In Advances in Superconductivity V, 635–38. Tokyo: Springer Japan, 1993. http://dx.doi.org/10.1007/978-4-431-68305-6_143.

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Solov’ev, A. A. "The Self-Similar Shrinkage of Force-Free Magnetic Flux Ropes in a Passive Medium of Finite Conductivity". In The Sun: New Challenges, 203–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29417-4_19.

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Niyomwas, S., e T. Chanadee. "Effect of Flux Ratio on the Products of Self Propagating High Temperature Synthesis-Casting in the WO3–Si–Al System". In Applications of Process Engineering Principles in Materials Processing, Energy and Environmental Technologies, 365–72. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51091-0_35.

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Kim, Yeong Sik, e Kyun Tak Kim. "Effect of Sliding Speed and Applied Load on the Wear Behavior of Thermally Sprayed Ni-Based Self-Flux Alloy Coating". In Key Engineering Materials, 840–43. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.840.

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Wu, S. T., e W. P. Guo. "A Self-Consistent Numerical Magnetohydrodynamic (MHD) Model of Helmet Streamer and Flux-Rope Interactions: Initiation and Propagation of Coronal Mass Ejections (CMEs)". In Coronal Mass Ejections, 83–89. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm099p0083.

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Trabalhos de conferências sobre o assunto "Self-flux"

Manning, Heidi L. K., Nathan J. Frank, Jason Bursack, Bradford W. Johnson, Steve M. Benner e Philip T. C. Chen. "Return flux experiment REFLEX: spacecraft self-contamination". In International Symposium on Optical Science and Technology, editado por Philip T. C. Chen e O. Manuel Uy. SPIE, 2002. http://dx.doi.org/10.1117/12.481651.

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Binder, Bernd. "Towards a Self-Consistent and Controllable Graviton Flux". In SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM-STAIF 2007: 11th Conf Thermophys.Applic.in Micrograv.; 24th Symp Space Nucl.Pwr.Propulsion; 5th Conf Hum/Robotic Techn & Vision Space Explor.; 5th Symp Space Coloniz.; 4th Symp New Frontrs & Future Con. AIP, 2007. http://dx.doi.org/10.1063/1.2437565.

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Li, Chunyan, e Chunhong Li. "Research on variable leakage flux function for a self-adaptive passive flux-weakening PMSM". In 2015 18th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2015. http://dx.doi.org/10.1109/icems.2015.7385272.

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Zeng, Xianxian, Heyun Lin, Ya Li e Xifang Zhao. "Design and Investigation of a New Variable Flux Memory Machine with Self-Flux Leakage Path". In 2022 IEEE 20th Biennial Conference on Electromagnetic Field Computation (CEFC). IEEE, 2022. http://dx.doi.org/10.1109/cefc55061.2022.9940885.

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Shipulin, Pavel V., Alla G. Nastovjak e Nataliya L. Shwartz. "Self-catalyzed GaAs Nanowire Growth at Alternate Arsenic Flux". In 2020 21st International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM). IEEE, 2020. http://dx.doi.org/10.1109/edm49804.2020.9153341.

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Madanzadeh, Sadjad, Wolfgang Gruber, Andrei Zhuravlev e Rafal P. Jastrzebski. "Self-Bearing Partitioned Stator Flux-Switching Permanent Magnet Motor". In 2022 25th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2022. http://dx.doi.org/10.1109/icems56177.2022.9983005.

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Cade, M. "Self-commissioning for a rotor flux oriented vector controlled drive". In IEE Colloquium Power Electronic Systems Simulation. IEE, 1998. http://dx.doi.org/10.1049/ic:19980896.

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Mulligan, Padhraic, Daniel Sweeney, Kara Godsey, N. Dianne Ezell e Christian Petrie. "High Flux Isotope Reactor Irradiation of Self-Powered Neutron Detectors". In 13th Nuclear Plant Instrumentation, Control & Human-Machine Interface Technologies (NPIC&HMIT 2023). Illinois: American Nuclear Society, 2023. http://dx.doi.org/10.13182/npichmit23-40937.

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Zhou, Chenfeng Vincent, Christopher Leckie, Shanika Karunasekera e Tao Peng. "A Self-Healing, Self-Protecting Collaborative Intrusion Detection Architecture to Trace-Back Fast-Flux Phishing Domains". In NOMS 2008 - 2008 IEEE Network Operations and Management Symposium Workshop. IEEE, 2008. http://dx.doi.org/10.1109/nomsw.2007.50.

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Pignasty, S. S. "THE THEORETICAL ANALYSIS OF A SELF-EXITED CYCLE MAGNETIC FLUX COMPRESSOR". In Ninth IEEE International Pulsed Power Conference. IEEE, 1993. http://dx.doi.org/10.1109/ppc.1993.512975.

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Relatórios de organizações sobre o assunto "Self-flux"

Ling, X. S., J. I. Budnick e D. Shi. Flux motion in the self-organized critical state of type-II superconductors. Office of Scientific and Technical Information (OSTI), abril de 1991. http://dx.doi.org/10.2172/10144502.

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Palaith, David. Real-Time, Self-Directed MBE Flux Control Incorporating in Situ Ellipsometry. Phase 2. Fort Belvoir, VA: Defense Technical Information Center, dezembro de 1995. http://dx.doi.org/10.21236/ada305553.

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Zheng, Weixiong, Yaqi Wang e Mark D. DeHart. Multiscale Capability in Rattlesnake using Contiguous Discontinuous Discretization of Self-Adjoint Angular Flux Equation. Office of Scientific and Technical Information (OSTI), setembro de 2016. http://dx.doi.org/10.2172/1364491.

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Vanderah, T. A., C. K. Lowe-Ma, D. E. Bliss, M. W. Decker e M. S. Osofsky. Growth of Near-Free-Standing YBa2Cu3O7-Type Crystals Using a Self- Decanting Flux Method. Fort Belvoir, VA: Defense Technical Information Center, maio de 1991. http://dx.doi.org/10.21236/ada243221.

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Jones. L51751 Evaluation of Low Hydrogen Welding Processes for Pipeline Construction in High Strength Steel. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), agosto de 1996. http://dx.doi.org/10.55274/r0010220.

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As the use of higher strength and thicker walled pipe becomes more prevalent, the procedures that would normally guard against hydrogen cracking when welding with cellulosic electrodes, become less effective and it has become necessary to investigate the use of alternative low hydrogen consumables. Low hydrogen manual welding processes, suitable for pipeline girth welding, have been available for some time for the lower strength pipe grades, and latterly, for high strength pipelines (up to and including X80). Despite their availability and advantages in terms of reduced crack susceptibility, they have been rarely used in production up to the present time. Basic coated shielded metal arc (SMA) electrodes, suitable for vertical-down welding, are produced by some manufacturers at the strength level required for both the root welding and filling of pipeline girth welds. Self-shielded flux-cored wires (SSFCA) are also available for both root and fill welding, and in addition to the low hydrogen levels, these have the advantage of increased productivity. Both of these processes require different methods of deposition compared to welding using cellulosic electrodes, which necessitates specialized training of welders. It is thought that this, along with doubts concerning the reliability and speed of the processes in site conditions, has made contractors reluctant to adopt them. Furthermore, there was a dearth of independently produced information on the welding production performance of low hydrogen processes. The objectives of this work was to generate data to enable users to make an informed judgement regarding the practical application of low hydrogen processes. Furthermore, it was intended to develop improved root welding procedures, which had been recognized as being significant process limitation. A further objective of this work was to collect data to permit an informed choice when choosing low hydrogen welding processes for modern high-strength steel walled pipe. The performance of low hydrogen vertical down electrodes (L4VD) and solid and flux cored wires for welding X80 linepipe is assessed with regard to ease of welding, productivity and weldment mechanical properties in comparison to cellulosic electrodes.

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Fiore e Boring. L52233 Evaluation of Hydrogen Cracking in Weld Metal Deposited Using Cellulosic-Coated Electrodes. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), outubro de 2006. http://dx.doi.org/10.55274/r0010378.

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Cellulosic-coated electrodes (primarily AWS EXX10-type) are traditionally used for "stovepipe" welding of pipelines because they are well suited for deposition of pipeline girth welds and are capable of high deposition rates when welding downhill. Despite advances in mechanized welding technology, development of low-hydrogen self-shielded flux-cored arc welding (FCAW) consumables, and substantial improvement of basic-coated low-hydrogen vertical-down shielded metal arc welding (SMAW) electrodes, manual pipeline welding using cellulosic-coated electrodes is still widely utilized throughout the world. Cellulosic-coated electrodes are also used for critical applications in offshore pipeline construction such as tie-in welds and repair welds.Hydrogen-assisted cracking can occur in both the weld metal and heat-affected zone (HAZ) regions of a welded joint, although HAZ hydrogen cracking is more common. Extensive work was undertaken in the 1970s and 1980s to study HAZ hydrogen cracking, and guidelines were developed to avoid HAZ hydrogen cracking by controlling heat input and preheat. Improvements in steelmaking practice and the trend toward leaner chemistries have also helped to alleviate HAZ hydrogen cracking. The primary objectives of this project are to further define the conditions that can lead to hydrogen cracking in weld metal deposited using cellulosic-coated electrodes, in terms of operator preference (arc length), electrode properties, power supply selection, and materials handling. The results of the project are being used to develop welding guidelines, and if applicable, re-hydration guidelines to prevent weld metal hydrogen cracking.

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