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Magnetic Sensorless Sensing of Plasma Position in the Superconducting Tokamak hT-7

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Plasma Science and Technology 2004年第5期6卷 2459-2462页

作者： K.Nakamura Z.S.Ji B.Shen P.J.Qin S.Itoh K.hanada M.Sakamoto E.Jotaki M.hasegawa A.Iyomasa S.Kawasaki h.nakashima Research Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 JapanInstitute of Plasma Physics Chinese Academy of Sciences Hefei 230031 ChinaInstitute of Plasma Physics Chinese Academy of Sciences Hefei 230031 ChinaInstitute of Plasma Physics Chinese Academy of Sciences Hefei 230031 ChinaResearch Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 JapanResearch Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 JapanResearch Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 JapanInstitute of Plasma Physics Chinese Academy of Sciences Hefei 230031 ChinaResearch Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 JapanResearch Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 JapanResearch Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 JapanResearch Institute for Applied Mechanics Kyushu University 6-1 Kasuga-koen Kasuga City Fukuoka 816-8580 Japan

Magnetic sensorless sensing experiments of the plasma horizontal positionhave been carried out in the superconducting tokamak hT-7. The horizontal position is calculatedfrom the vertical field coil current and voltage without using signals of magnetic probes placednearby a plasma. The calculations are focused on the ripple frequency component of the power *** is no drift problem with the time integration of magnetic probe signals. The error of thederived plasma position is lower than 2% of the plasma minor radius.

关键词： sensorless sensing plasma position hT-7

Two Dimensional Density FlUCtuation Measurements During the Non-Inductive Current Ramp-up Phase in the Compact Plasma Wall Interaction Experimental Device CPD

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Plasma Science and Technology 2009年第4期11卷 397-401页

作者： h.ZUShI T.RYOUKAI K.KIKUKAWA T.MORISAKI R.BhATTAChARYAY T.YOShINAGA K.hANADA T.SAKIMURA h.IDEI K.DONO N.NIShINO h.hONMA S.TAShIMA T.MUTOh S.KUBO K.NAGASAKI M.SAKAMOTO Y.nakashima Y.hIGAShIZONO K.N.SATO K.NAKAMURA M.hASEGAWA S.KAWASAKI h.nakashima A.hIGAShIJIMA RIAM Kyushu University IGSES Kyushu University National Institute for Fusion Science hiroshima University Kyoto University University of Tsukuba

Two-dimensional structure of density fluctuations is examined during the current jump phase, indicating a change from the open magnetic fields to the closed ones. During the smooth current ramp-up phase the two-dimensional contour of the LiI intensity shows vertically alignment, consistent with the magnetic surfaces. At the inflection point in Ip ramp-up the LiI intensity contour becomes flat in the observation regime and then suddenly a steep gradient and higher intensity regime are formed in the vertical direction. This higher intensity corresponds to a burst of LiI waveform. According to these changes in the contour, it is found that, within ~1 ms around the burst of LiI, a low frequency coherent wave with a long wavelength rapidly grows. The relations with other signals （magnetic flux and microwave stray power） are discussed with respect to the topological change in the magnetic configuration and mode conversion of the incident electromagnetic waves.

关键词： Li sheet beam density fluctuations current ramp-up spherical tokamak

Power Balance Estimation in Long Duration Discharges on QUEST

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Plasma Science and Technology 2016年第11期18卷 1069-1075页

作者： K.hANADA h.ZUShI h.IDEI K.NAKAMURA M.IShIGURO S.TAShIMA E.I.KALINNIKOVA Y.NAGAShIMA M.hASEGAWA A.FUJISAWA A.hIGAShIJIMA S.KAWASAKI h.nakashima O.MITARAI A.FUKUYAMA Y.TAKASE X.GAO h.LIU J.QIAN M.ONO R.RAMAN Research Institute for Applied Mechanics Kyushu UniversityFukuoka 816-8580Japan Interdisciplinary Graduate School of Engineering Science Kyushu UniversityFukuoka 816-8580Japan School of Industrial Engineering Tokai UniversityKumamoto 862-8652Japan Graduate School of Technology Kyoto UniversityKyoto 615-8530Japan Graduate School of Frontier Science University of TokyoChiba 277-8561Japan Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Princeton Plasma Physics Laboratory Princeton NJ 08540USA SAeronautics&Astronautics University of WashingtonSeattle WA 98195-2400USA

Fully non-inductive plasma start-up was successfully achieved by using a well- controlled microwave source on the spherical tokamak, QUEST. Non-inductive plasmas were maintained for approximately 3-5 min, during which time power balance estimates could be achieved by monitoring wall and cooling-water temperatures. Approximately 70%-90% of the injected power could be accounted for by calorimetric measurements and approximately half of the injected power was found to be deposited on the vessel wall, which is slightly dependent on the magnetic configuration. The power distribution to water-cooled limiters, which are expected to be exposed to local heat loads, depends significantly on the magnetic configuration, however some of the deposited power is due to energetic electrons, which have large poloidal orbits and are likely to be deposited on the plasma facing components.

关键词： steady state operation spherical tokamak plasma wall interaction power balance

Dynamic stress concentration in an infinitely long cylindrical cavity due to a point spherical source embedded within a fluid-saturated poroelastic formation of infinite extent

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 139-156页

作者： h.hOSSEINI O.BALILAShAKI Department of Mechanical Engineering Faculty of EngineeringGolestan University

The effects of a harmonically exciting monopole source on an infinitely long cylindrical cavity embedded entirely within a fluid-saturated poroelastic formation of infinite extent are examined theoretically. It is assumed that the source is located outside the cavity at a specified distance from the borehole axis. The magnitudes of the hoop and radial stresses beside the pore pressures exerted on the interface and inside the porous medium surrounding the borehole are calculated and discussed. Biot's poroelastic modeling along with three types of boundary conditions for the cylindrical interface including the ideal fluid, empty borehole, and rigid inclusion with a hard boundary is employed for the analysis. Utilizing a proper translational addition theorem for expressing the incident spherical wave in terms of cylindrical wave expansions, the proposed boundary conditions at the interface are satisfied. Stresses are formulated by means of wave potential functions in a three-dimensional(3D) manner. The effects of the frequency and the radial distance between the source and borehole on the induced stresses are examined for the first cylindrical modes over frequency spectra. Two permeability conditions for the interface and three types of soils for the porous formation are considered throughout the analysis. To give an overall outline of the study, a numerical example is presented. The results clearly indicate that the distance is a key parameter and has considerable effects on the induced stress values. In addition, the interface permeability condition and soil characteristics play an important role in determining the dynamic response of the borehole. Finally,the obtained results are compared with the relevant analyses existing in the literature for some limit cases, and good agreement is achieved.

关键词： cylindrical cavity O353.4 point source porous medium stress concentration wave-field transformation

Multi-Objective optimization for stable and efficient cargo transportation of partial space elevator

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Defence Technology(防务技术) 2025年第2期44卷 17-29页

作者： Gefei Shi Zheng h.Zhu School of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou 510275China Shenzhen Key Laboratory of Intelligent Microsatellite Constellation Shenzhen 518107China Department of Mechanical Engineering York University4700 Keele StreetTorontoCanada

This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration stability in cargo *** LD-ASF is further optimized for payload transportation efficiency by a novel coordinate game theory to balance competing control objectives among payload transport speed,stable end body's libration,and overall control input via model predictive *** transfer period is divided into several sections to reduce computational *** validity and efficacy of the proposed LD-ASF and coordinate game-based model predictive control are demonstrated by computer *** results reveal that the optimized LD-ASF results in higher transportation speed,stable end body's libration,lower thrust fuel consumption,and more flexible optimization space than the classic analytical speed function.

关键词： Partial space elevator Stable transportation Libration decoupling analytical speed function Coordinate game Model predictive control Pareto optimization

ON ThE GAUSSIAN KINEMATIC FORMULA OF *** AND ***

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Acta Mathematica Scientia 2025年第1期45卷 200-214页

作者： Joseph h.G.Fu Department of Mathematics University of GeorgiaAthensGA30602USA

We apply methods of algebraic integral geometry to prove a special case of the Gaussian kinematic formula of *** idea,suggested already by Adler and Taylor,is to view the GKF as the limit of spherical kinematic formul... 详细信息

关键词： integral geometry kinematic formula probability density Gaussian density

Neuroinflammation as a therapeutic target in huntington's disease

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Neural Regeneration Research 2025年第3期20卷 817-818页

作者： Andrea Kwakowsky Thulani h.Palpagama Center for Brain Research and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Pharmacology and Therapeutics School of MedicineGalway Neuroscience CentreUniversity of GalwayGalwayIreland

In 1872, George huntington presented his essay “On Chorea” to the Meigs and Mason Academy of Medicine and, in doing so, detailed a disease that would later bear his name. huntington's disease(hD) is a genetic, neurodegenerative disease that manifests as the loss of motor control,cognitive impairment,and mood and psychiatric changes in paents.

关键词： huntington inflammation Medicine

Glial response in the midcingulate cortex in huntington’s disease

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Neural Regeneration Research 2025年第1期20卷 207-208页

作者： Thulani h.Palpagama Andrea Kwakowsky Center for Brain Research and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Pharmacology and Therapeutics School of MedicineGalway Neuroscience CenterUniversity of GalwayGalwayIreland

huntington’s disease(hD)is a genetic disease characterized by the progressive degeneration of the striatum and *** can present with a variety of symptoms that can broadly be classified into motor symptoms,inclusive of choreatic movements and rigidity,mood and psychiatric symptoms,such as depression and apathy,and cognitive symptoms,such as cognitive *** causal mutation underlying hD results from an expansion of a CAG repeat sequence on the IT15 gene,resulting in the formation and accumulation of a mutant huntingtin protein.

关键词： huntington degeneration cortex

Comparative chemical sensor for detection of chromium(Ⅵ) in aqueous solution

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Optoelectronics Letters 2025年第1期21卷 21-27页

作者： Sura h.AL-REKABI A.A.ALWAhIB Electrical Technique Department Al Suwayrah Technical InstituteMiddle Technical UniversityBaghdadIraq Laser and Optoelectronics Department University of Technology-IraqBaghdadIraq

A process for purifying aqueous solutions containing heavy and toxic metals such as chromium(Cr) has been *** of the extremely harmful pollutants in rivers and seawater is the heavy metal ions due to their direct impacts on human,animals and plants are hexavalent Cr(Ⅵ).Consequently,highly sensitive sensor to detect Cr is *** plasmon resonance(SPR) technique has attracted huge research interest in detecting heavy metals *** this study,three types of prism-based SPR sensor,gold(Au)/silver(Ag),Au/polyaniline(PANI) and Au/titanium dioxide(TiO_(2)) nanostructured films,are investigated as potential sensing material to detect the presence of Cr(Ⅵ) ions in *** base Au layer with thickness of 48.3 nm is deposited on a glass slide for all *** Au/Ag,Au/PANI nanofibers and Au/TiO_(2) sensor films,the Cr(Ⅵ) concentration is varied from 1 ppm to 15 ppm with sensitivity of 0.270 °ppm^(-1),0.082 °ppm^(-1) and 0.039 °ppm^(-1),*** on these results,the Au/PANI nanofibers are the most sensitive to Cr(Ⅵ) among the tested sensing materials.

关键词： chromium fibers silver