Статті в журналах: "Resistive drift wave"

1

Camargo, Suzana J., Dieter Biskamp, and Bruce D. Scott. "Resistive drift‐wave turbulence." Physics of Plasmas 2, no. 1 (January 1995): 48–62. http://dx.doi.org/10.1063/1.871116.

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2

Pedersen, Thomas Sunn, Poul K. Michelsen, and Jens Juul Rasmussen. "Resistive coupling in drift wave turbulence." Plasma Physics and Controlled Fusion 38, no. 12 (December 1, 1996): 2143–54. http://dx.doi.org/10.1088/0741-3335/38/12/008.

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3

Numata, Ryusuke, Rowena Ball, and Robert L. Dewar. "Bifurcation in electrostatic resistive drift wave turbulence." Physics of Plasmas 14, no. 10 (October 2007): 102312. http://dx.doi.org/10.1063/1.2796106.

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4

Lewandowski, J. LV. "Collisional drift waves in stellarator plasmas." Canadian Journal of Physics 81, no. 12 (December 1, 2003): 1309–30. http://dx.doi.org/10.1139/p03-108.

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A computational study of resistive drift waves in the edge plasma of a stellarator with an helical magnetic axis is presented. Three coupled field equations, describing the collisional drift-wave dynamics in the linear approximation, are solved as an initial-value problem along the magnetic field line. The magnetohydrodynamic equilibrium is obtained from a three-dimensional local equilibrium model. The use of a local magnetohydrodynamic equilibrium model allows for a computationally efficient systematic study of the impact of the magnetic field structure on drift-wave stability. PACS Nos.: 52.35.Kt, 52.30.Jb, 52.35.Ra

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5

Moestam, Robert, and Jan Weiland. "Resistive drift wave instability due to nonlinear structures." Nuclear Fusion 43, no. 10 (September 16, 2003): 1135–39. http://dx.doi.org/10.1088/0029-5515/43/10/015.

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6

Yang, Shangchuan, Ping Zhu, Jinlin Xie, and Wandong Liu. "Two-fluid MHD regime of resistive drift-wave instability." Physics of Plasmas 25, no. 9 (September 2018): 092113. http://dx.doi.org/10.1063/1.5043323.

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7

Hu, Genze, John A. Krommes, and John C. Bowman. "Statistical theory of resistive drift-wave turbulence and transport." Physics of Plasmas 4, no. 6 (June 1997): 2116–33. http://dx.doi.org/10.1063/1.872377.

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8

Rehman, Umer. "Electromagnetic Viscous-Resistive-Drift-Wave Instability in Burning Plasma." Journal of Fusion Energy 38, no. 5-6 (May 11, 2019): 531–38. http://dx.doi.org/10.1007/s10894-019-00219-3.

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9

Korsholm, So/ren B., Poul K. Michelsen, and Volker Naulin. "Resistive drift wave turbulence in a three-dimensional geometry." Physics of Plasmas 6, no. 6 (June 1999): 2401–8. http://dx.doi.org/10.1063/1.873511.

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10

Biskamp, Dieter, Suzana J. Camargo, and Bruce D. Scott. "Spectral properties and statistics of resistive drift-wave turbulence." Physics Letters A 186, no. 3 (March 1994): 239–44. http://dx.doi.org/10.1016/0375-9601(94)90346-8.

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11

KASUYA, Naohiro, and Makoto SASAKI. "Wave Number Dependence on Ion Mass Number of Resistive Drift Wave Instabilities." Plasma and Fusion Research 17 (May 13, 2022): 1201053. http://dx.doi.org/10.1585/pfr.17.1201053.

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12

KASUYA, NAOHIRO, MASATOSHI YAGI, and KIMITAKA ITOH. "Simulation of resistive drift wave turbulence in a linear device." Journal of Plasma Physics 72, no. 06 (December 2006): 957. http://dx.doi.org/10.1017/s002237780600537x.

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13

Hu, Genze, John A. Krommes, and John C. Bowman. "Resistive drift-wave plasma turbulence and the realizable Markovian closure." Physics Letters A 202, no. 1 (June 1995): 117–25. http://dx.doi.org/10.1016/0375-9601(95)00281-7.

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14

Nishimura, Y., K. Borrass, D. Coster, and B. Scott. "Effects of resistive drift wave turbulence on tokamak edge transport." Contributions to Plasma Physics 44, no. 13 (April 2004): 194–99. http://dx.doi.org/10.1002/ctpp.200410027.

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15

KASUYA, Naohiro, Masanobu ISHIDA, Yudai IMAHASHI, and Masatoshi YAGI. "Ion Mass Dependence of Resistive Drift Wave Turbulence in Cylindrical Plasmas." Plasma and Fusion Research 16 (June 18, 2021): 1201083. http://dx.doi.org/10.1585/pfr.16.1201083.

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16

Kasuya, Naohiro, Masatoshi Yagi, Masafumi Azumi, Kimitaka Itoh, and Sanae-I. Itoh. "Numerical Simulation of Resistive Drift Wave Turbulence in a Linear Device." Journal of the Physical Society of Japan 76, no. 4 (April 15, 2007): 044501. http://dx.doi.org/10.1143/jpsj.76.044501.

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17

Zhang, Yanzeng, and Sergei I. Krasheninnikov. "Influence of zonal flow and density on resistive drift wave turbulent transport." Physics of Plasmas 27, no. 12 (December 2020): 122303. http://dx.doi.org/10.1063/5.0025861.

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18

Kondo, Shintaro, and Atusi Tani. "Initial Boundary Value Problem for Model Equations of Resistive Drift Wave Turbulence." SIAM Journal on Mathematical Analysis 43, no. 2 (January 2011): 925–43. http://dx.doi.org/10.1137/09075980x.

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19

Bos, W. J. T., S. Futatani, S. Benkadda, M. Farge, and K. Schneider. "The role of coherent vorticity in turbulent transport in resistive drift-wave turbulence." Physics of Plasmas 15, no. 7 (July 2008): 072305. http://dx.doi.org/10.1063/1.2956640.

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20

Zhang, Yanzeng, Sergei I. Krasheninnikov, and Andrei I. Smolyakov. "Influence of flow shear on localized Rayleigh-Taylor and resistive drift wave instabilities." Contributions to Plasma Physics 60, no. 5-6 (December 8, 2019): e201900098. http://dx.doi.org/10.1002/ctpp.201900098.

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21

GARCIA, O. E. "Two-field transport models for magnetized plasmas." Journal of Plasma Physics 65, no. 2 (February 2001): 81–96. http://dx.doi.org/10.1017/s0022377801008972.

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Two-field fluid models for low-frequency density and electrostatic potential fluctuations in a purely toroidal magnetized low-β plasma are discussed. In particular, we present some simple models suitable for investigating plasma transport close to marginal stability. For gradient-driven fluctuations, linear normal mode analysis of the interchange and resistive drift wave instabilities are reviewed, with attention to the relative phase and amplitude of density and electrostatic potential fluctuations. This reveals many characteristic features of drift-wave fluctuations that are also observed in laboratory experiments and during ionospheric irregularities. Finally, these results are used to investigate the nonlinearly conserved energy functionals, discussing the effect of magnetic field curvature and particle collisions on energy, enstrophy, and cross-correlation between density and vorticity fluctuations. Implications for turbulent fluctuations and nonlinear transport in laboratory and ionospheric plasmas are discussed.

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22

Wakatani, M., K. Watanabe, H. Sugama, and A. Hasegawa. "Resistive drift wave and interchange turbulence in a cylindrical plasma with magnetic and velocity shear." Physics of Fluids B: Plasma Physics 4, no. 7 (March 1992): 1754–65. http://dx.doi.org/10.1063/1.860031.

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23

ROSENBERG, M. "A note on ion–dust streaming instability in a collisional dusty plasma." Journal of Plasma Physics 67, no. 4 (May 2002): 235–42. http://dx.doi.org/10.1017/s0022377802001678.

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This note investigates an ion-dust streaming instability with frequency ω less than the dust collision frequency νd, in an unmagnetized collisional dusty plasma. Under certain conditions, a resistive instability can be excited by an ion drift on the order of the ion thermal speed, even when the dust acoustic wave is heavily damped. The effect of weak collisions on the usual dust acoustic instability in the regime ω > νd is also considered. Applications to experimental observations of low-frequency fluctuations in laboratory d.c. glow discharge dusty plasmas are discussed.

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24

Li, Jiquan, Y. Kishimoto, Y. Kouduki, Z. X. Wang, and M. Janvier. "Finite frequency zonal flows in multi-scale plasma turbulence including resistive MHD and drift wave instabilities." Nuclear Fusion 49, no. 9 (August 13, 2009): 095007. http://dx.doi.org/10.1088/0029-5515/49/9/095007.

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25

Peng, X. D., J. Q. Xu, H. B. Jiang, and G. Wang. "Transition between resistive ballooning mode and toroidal drift wave mode at the edge of tokamak plasmas." Physics of Plasmas 25, no. 3 (March 2018): 032505. http://dx.doi.org/10.1063/1.5009680.

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26

Hu, Shilin, Jiquan Li, Hongpeng Qu, and Y. Kishimoto. "Spatial localization of resistive drift wave structure in tokamak edge plasmas with an embedded magnetic island." Physics of Plasmas 21, no. 10 (October 2014): 102508. http://dx.doi.org/10.1063/1.4897942.

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27

Futatani, Shimpei, Wouter J. T. Bos, Diego del-Castillo-Negrete, Kai Schneider, Sadruddin Benkadda, and Marie Farge. "Coherent vorticity extraction in resistive drift-wave turbulence: Comparison of orthogonal wavelets versus proper orthogonal decomposition." Comptes Rendus Physique 12, no. 2 (March 2011): 123–31. http://dx.doi.org/10.1016/j.crhy.2010.12.004.

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28

Zhang, Y., S. I. Krasheninnikov, and A. I. Smolyakov. "Different responses of the Rayleigh–Taylor type and resistive drift wave instabilities to the velocity shear." Physics of Plasmas 27, no. 2 (February 2020): 020701. http://dx.doi.org/10.1063/1.5130409.

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29

Cianfrani, Francesco, Guillaume Fuhr, and Peter Beyer. "Edge plasma relaxations due to diamagnetic stabilization." Physics of Plasmas 29, no. 3 (March 2022): 032302. http://dx.doi.org/10.1063/5.0077080.

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A new mechanism for pressure profile relaxations in an edge tokamak plasma is derived from simulations within the two-fluid three-dimensional turbulence code EMEDGE3D. The relaxation is due to diamagnetic coupling in the resistive ballooning/drift wave dynamics: Unstable modes experience explosive growth at high pressure gradients after a phase in which they are stabilized by the diamagnetic coupling leading to the onset of a transport barrier. The sheared E × B flow does not play any significant role. After relaxation, the transport barrier forms again and it sets the conditions for a new relaxation event, resulting in an oscillatory behavior. We find that energy flux into the scrape-off layer decreases with the increasing oscillation frequency and that the oscillations are tamed by increasing plasma temperature. This behavior is reminiscent of the so-called type-III edge localized modes. A one-dimensional model reproducing the relaxations is also derived.

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30

Wilhelmsson, H., and M.-N. Le Roux. "Fusion plasma dynamics governed by two mixed transport processes: ion temperature gradient driven drift-wave turbulence and resistive-ballooning mode turbulence." Physica Scripta 52, no. 5 (November 1, 1995): 596–602. http://dx.doi.org/10.1088/0031-8949/52/5/017.

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31

Plotkin, V. V., and V. V. Potapov. "Magnetotelluric Sounding in the Arctic Using a Drifting Station on an Ice Floe (Numerical Experiment)." Russian Geology and Geophysics 63, no. 8 (August 1, 2022): 966–79. http://dx.doi.org/10.2113/rgg20214398.

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Abstract —The magnetotelluric sounding (MTS) method implemented on drifting ice floes in the Arctic is suitable for detection of 3D inhomogeneities in crustal conductivity while recording the transverse magnetic (TM) mode potential of the electromagnetic field. Highconductivity layers of seawater and sediments shield the underlying 3D inhomogeneity. Their presence virtually does not affect changes in the standard responses of the medium used in MTS but is quite noticeable in the characteristics of the TM mode. To register them, one can use a circular electric dipole (CED) located at the surface of an ice floe. During the drift, the electric field can be measured on the ice floe using electrodes in seawater. We propose to lower the magnetic sensors beneath the ice, in seawater, because ice deformations interfere with the magnetic-field component measurements. The coordinates of the observation station during MT soundings on the ice floe in the Arctic (similarly to earlier observations at the North Pole stations) can change significantly. To take into account the effect of horizontal movements of the drifting station, we propose to complement all the recorded time series with the coordinates of measurement points. We have developed a technique for processing such data to take into account nonplane-wave effects, which can occur in the Arctic because of the proximity of ionospheric current jets. We carry out the synchronization of all observations in the investigated area, using a model of spatial and temporal field variations and data accumulation. To test our approach, we use the synthetic experimental data for the model that considers the existence of seawater, sediment, resistive crust, crustal object, and underlying mantle. We determine the crustal 3D object parameters with account of the TM-mode potential distributions at the seawater surface restored from the synthetic experimental data obtained at the drifting station during the drift. We use the Nelder–Mead method for optimization of the object characteristics. The parameters of the object become highly similar to their test values if the trajectory of the drifting station passes through an object, covering it most fully.

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32

Fenies, Hugues, Gilles Lericolais, and Henry W. Posamentier. "Comparison of wave-and tide-dominated incised valleys: specific processes controlling systems tract architecture and reservoir geometry." Bulletin de la Société Géologique de France 181, no. 2 (March 1, 2010): 171–81. http://dx.doi.org/10.2113/gssgfbull.181.2.171.

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Abstract This paper presents a comparison between the system tract architecture and the reservoir geometries of the Gironde and Leyre (Arcachon) incised-valley fills, both located within the Bay of Biscay 100 km apart. This study, based on high resolution seismic lines acquired by Ifremer on the continental shelf and onshore core and well data, illustrates that some features of the Gironde and Leyre valleys fills are similar while some others are not. The architecture of both valley fills is characterized by fifth order depositional sequences (corresponding to an interval from 120000 yr B.P. to present day). Both valleys are filled predominantly with transgressive systems tract, with associated poorly developed lowstand and highstand systems tracts. Key stratigraphic surfaces punctuate the valley-fill architecture and comprise deeply eroding tidal ravinement surfaces merged with and enhancing, earlier formed, fluvial-related erosive sequence boundaries. These tidal ravinement surfaces can be undulatory in form and in most places mark the basal boundary of the incised valleys. In contrast, nearly horizontal wave ravinement surfaces cap the incised-valley fills, extending over the adjacent interfluves. The Gironde and Leyre (Arcachon) valley fills exhibit two main stratigraphic differences: 1) transgressive systems tract sand bodies are ribbon shaped within the Gironde and tabular shaped within the Leyre; 2) lowstand systems tract deposits, represented by fluvial sediments, are preserved within the Gironde but absent within the Leyre. In a wave- and tide-dominated environment, the geometry of the sandbodies within the transgressive systems tract is a function of the tidal ravinement processes, which characterizes the estuary inlet. Two categories of tidal ravinement processes can be distinguished here: “anchored tidal ravinement” and “sweeping tidal ravinement”. The Gironde estuary is characterized by an “anchored tidal ravinement”. The tidal inlet has remained largely in a fixed location; littoral drift has not shifted the tidal inlet to the south because it is constrained by resistive Eocene carbonates that define the margins of the Gironde incised valley. In contrast, the Leyre estuary is characterized by a “sweeping tidal ravinement”. The inlet has been shifted approximately 30 km to the south by the formation of a littoral drift associated spit. This extensive lateral shifting was made possible by the fact that the incised valley was cut into unconsolidated, easily eroded Pleistocene sands. Within a wave- and tide-dominated environment, the preservation potential of the lowstand systems tract is a function of the size of the fluvial drainage basin. During lowstand time, the erosive power of the fluvial discharge was much greater within the much larger Gironde valley, consequently the fluvial sequence boundary was cut much deeper in the Gironde valley than within the Leyre valley and, correspondingly, the thickness of the associated fluvial deposits was commensurately greater. In response, the lowstand systems tract was not preserved within the Leyre valley fill because the depth of tidal ravinement erosion formed during the sea-level rise and associated transgression was greater than that associated with fluvial incision generated during the sea-level fall.

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33

Camargo, Suzana J., Michael K. Tippett, and Iberê L. Caldas. "Nonmodal energetics of resistive drift waves." Physical Review E 58, no. 3 (September 1, 1998): 3693–704. http://dx.doi.org/10.1103/physreve.58.3693.

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34

L. V. Lewandowski, Jerome. "Resistive Drift Waves in a Toroidal Heliac." Journal of the Physical Society of Japan 66, no. 12 (December 15, 1997): 3831–41. http://dx.doi.org/10.1143/jpsj.66.3831.

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35

L. V. Lewandowski, J. "Resistive Drift Waves in a Bumpy Torus." Journal of the Physical Society of Japan 73, no. 4 (April 15, 2004): 898–906. http://dx.doi.org/10.1143/jpsj.73.898.

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36

Korsholm, S. B., P. K. Michelsen, and H. L. P?cseli. "Nonlinear Dynamics of Resistive Electrostatic Drift Waves." Physica Scripta T82, no. 1 (1999): 12. http://dx.doi.org/10.1238/physica.topical.082a00012.

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37

Sun, Xuan, Costel Biloiu, and Earl Scime. "Observation of resistive drift Alfvén waves in a helicon plasma." Physics of Plasmas 12, no. 10 (October 2005): 102105. http://dx.doi.org/10.1063/1.2054547.

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38

Sanchez, Kevin, Bilel Achour, Anthony Coustou, Aurélie Lecestre, Samuel Charlot, Maylis Lavayssière, Alexandre Lefrançois, Hervé Aubert, and Patrick Pons. "Transient Response of Miniature Piezoresistive Pressure Sensor Dedicated to Blast Wave Monitoring." Sensors 22, no. 24 (December 7, 2022): 9571. http://dx.doi.org/10.3390/s22249571.

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Blast waves generated by energetic materials involve very fast time variations in the pressure. One important issue for blast wave metrology is the accurate measurement (typical precision in the range of ±5% or better) of the static overpressure peak. For most near field configurations, this measurement requires ultra-fast sensors with response times lower than a few microseconds. In this paper, we design, model, fabricate and characterize a new ultra-fast sensor using piezo-resistive gauges at the center of a miniaturized and rectangular silicon membrane. When a pressure step of 10 bar is applied to the membrane, the signal delivered to the sensor output presents dampened oscillations, with a resonant frequency of 20.6 MHz and quality factor of 24,700 ns after the arrival of the shock wave. After removing undesirable drifts that appear after 700 ns, we may expect the sensor to have a response time (at ±5%) of 1.2 µs. Consequently, the proposed pressure sensor could be advantageously used for the accurate measurement of static overpressure peaks in blast wave experiments.

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39

Thompson, Christopher. "Radio Emission of Pulsars. II. Coherence Catalyzed by Cerenkov-unstable Shear Alfvén Waves." Astrophysical Journal 933, no. 2 (July 1, 2022): 232. http://dx.doi.org/10.3847/1538-4357/ac51d4.

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Abstract This paper explores small-scale departures from force-free electrodynamics around a rotating neutron star, extending our treatment of resistive instability in a quantizing magnetic field. A secondary, Cerenkov instability is identified: relativistic particles flowing through thin current sheets excite propagating charge perturbations that are localized near the sheets. Growth is rapid at wavenumbers below the inverse ambient skin depth k p,ex. Small-scale Alfvénic wavepackets are promising sources of coherent curvature radiation. When the group Lorentz factor γ gr ≲ ( k p , ex R c ) 1 / 3 ∼ 100 , where R c is the magnetic curvature radius, a fraction ∼10−3–10−2 of the particle kinetic energy is radiated into the extraordinary mode at a peak frequency ∼10−2 ck p,ex. Consistency with observations requires a high pair multiplicity (∼103–5) in the pulsar magnetosphere. Neither the primary, slow resistive instability nor the secondary, Alfvénic instability depend directly on the presence of magnetospheric gaps, and may activate where the mean current is fully supplied by outward drift of the corotation charge. The resistive mode is overstable and grows at a rate comparable to the stellar spin frequency; the model directly accommodates strong pulse-to-pulse radio flux variations and coordinated subpulse drift. Alfvén mode growth can track the local plasma conditions, allowing for lower-frequency emission from the outer magnetosphere. Beamed radio emission from charged packets with γ gr ∼ 50–100 also varies on submillisecond timescales. The modes identified here will be excited inside the magnetosphere of a magnetar, and may mediate Taylor relaxation of the magnetic twist.

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40

Bharuthram, R., and M. A. Hellberg. "Low-frequency drift-induced instabilities in a magnetized two-ion plasma." Journal of Plasma Physics 35, no. 3 (June 1986): 393–412. http://dx.doi.org/10.1017/s0022377800011429.

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Numerical solutions of a dispersion relation for low-frequency electrostatic waves in a current-carrying, cold, weakly collisional, magnetized two-ion plasma are used to discuss the two-stream and resistive natures of the ion-ion hybrid instability. An instability with analogous behaviour is found to be associated with the light ion cyclotron frequency. Analytical results explain the behaviour. A numerically derived transition diagram summarizes the parameter values for which transitions between different modes take place.

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41

Santos, João Alfredo, Liliana V. Pinheiro, Hossam S. Abdelwahab, Conceição Juana E. M. Fortes, Francisco G. L. Pedro, Rui P. Capitão, Miguel A. Hinostroza, and Carlos Guedes Soares. "Physical Modelling of Motions and Forces on a Moored Ship at the Leixões Port." Defect and Diffusion Forum 396 (August 2019): 60–69. http://dx.doi.org/10.4028/www.scientific.net/ddf.396.60.

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This paper describes the physical model, experimental setup and tests performed at the Portuguese Civil Engineering Laboratory (LNEC), to study the motions and forces of a moored ship at the Leixões port, for different sea states in irregular waves. The tests were carried out at one of the wave tanks of LNEC, where the Leixões port layout was implemented at scale 1:80 with the detailed model similar to the prototype bathymetry and surrounding structures. The moored ship is a 3.43 m long scale model of the well-known “Esso Osaka” tanker and is moored to the pier A of the oil terminal at 0.135 m draft. Several types of measurements were recorded in this study. The free-surface elevation and wave direction were measured with a set of resistive wave gauges. The wave velocities at the entrance of the harbour were measured with an acoustic Doppler velocimeter. Motions of the moored ship were measured with the OptiTrackTM motion capture system whereas forces on fenders and mooring lines were measured with load cells attached to a complex spring system developed at LNEC. Several tests were carried out for a number of incident sea states characterized by a JONSWAP spectrum, with different significant wave heights and peak periods. The measurement, analysis and results obtained for the incident wave conditions characterized by a significant wave height of 6 m and a peak wave period of 14 s are presented and discussed in this paper.

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42

Yagi, Masatoshi, Masahiro Wakatani, and Akira Hasegawa. "Transport Driven by G Modes and Resistive Drift Waves Based on Scale Invariance." Journal of the Physical Society of Japan 56, no. 3 (March 15, 1987): 973–81. http://dx.doi.org/10.1143/jpsj.56.973.

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43

Arnholtz, Jens, Guglielmo Meardi, and Johannes Oldervoll. "Collective wage bargaining under strain in northern European construction: Resisting institutional drift?" European Journal of Industrial Relations 24, no. 4 (August 3, 2018): 341–56. http://dx.doi.org/10.1177/0959680118790816.

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Internationalization, trade union decline, enforcement problems and rising self-employment all strain the effectiveness of collective wage bargaining arrangements in northern European construction. We examine Denmark, Germany, the Netherlands, Norway and the UK, and show that these strains have pushed trade unions to seek assistance from the state to stabilize wage regulation, but with results that vary according to employer strategies and the power balances between the actors. While Denmark and the UK have barely introduced any state support, Norway has followed the Netherlands and Germany in introducing legal mechanisms for extension of collectively agreed minimum wage terms. The country studies suggest that state assistance alleviates some of the strain, but does not reverse the trends, and the comparison indicates that both institutional innovation and reorganization may be required if wage bargaining is not to drift into different functions.

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44

XAPLANTERIS, CONSTANTINE L. "Collisional instability in a rare magnetized plasma: an experimental model for magnetospheric and space plasma study." Journal of Plasma Physics 75, no. 3 (June 2009): 395–406. http://dx.doi.org/10.1017/s0022377809007818.

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AbstractIn a suitable experimental device, laboratory plasma is produced with conditions and parameters analogous to magnetospheric plasma; we light a rare plasma in a semi-machine using rf-frequency discharge. Three ranges of low-frequency instabilities appear, one of which is identified as drift, caused by electron–neutral collisions. A full theoretical elaboration adapted to production conditions and geometrical symmetry is carried out; one solution of the dispersion relation is sufficient justification for the existence of the instability. The mathematical analysis also has the ambition to give interpretation for other low-frequency waves. Here we make a sound identification of the instability type as drift resistive due to electron–neutral collisions by an investigation of the growth rate. An agreement between experimental results and the theoretical model is obtained. As in the magnetosphere, an external magnetic field restrains the plasma.

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Anvarsamarin, Ali, Fayaz Rahimzadeh Rofooei, and Masoud Nekooei. "Soil-Structure Interaction Effect on Fragility Curve of 3D Models of Concrete Moment-Resisting Buildings." Shock and Vibration 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/7270137.

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This paper presents the probabilistic generation of collapse fragility curves for evaluating the performance of 3D, reinforced concrete (RC) moment-resisting building models, considering soil-structure interaction (SSI) by concentration on seismic uncertainties. It considers collapse as the loss of lateral load-resisting capacity of the building structures due to severe ground shaking and consequent large interstory drifts intensified by P-Δ effects as well as the strength and stiffness deterioration of their lateral load carrying systems. The estimation of the collapse performance of structures requires the relation between the intensity measure (IM) and the probability of collapse that is determined using the generated collapse fragility curves. Considering a number of 6-, 12-, and 18-story, 3D, RC moment-resisting buildings, two scalar IMs are employed to estimate their collapse fragility curve. On the other hand, the effect of the site soil type on the collapse fragility curves was taken into account by considering the soil-structure interaction. According to the obtained results, adopting the average of spectral acceleration (Saavg) intensity measure is more efficient in capturing the effect of the inherent uncertainties of the strong ground motions on the structural response parameters. In addition, considering the SSI for soil type D with shear-wave velocity of 180 m/s to 360 m/s reduces the median of intensity measure (IM = Sa(T1)) of fragility curve in 6-, 12-, and 18-story buildings by 4.92%, 22.26%, and 23.03%, respectively.

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Giacomin, M., and P. Ricci. "Turbulent transport regimes in the tokamak boundary and operational limits." Physics of Plasmas 29, no. 6 (June 2022): 062303. http://dx.doi.org/10.1063/5.0090541.

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Two-fluid, three-dimensional, flux-driven, global, electromagnetic turbulence simulations carried out by using the GBS (Global Braginskii Solver) code are used to identify the main parameters controlling turbulent transport in the tokamak boundary and to delineate an electromagnetic phase space of edge turbulence. Four turbulent transport regimes are identified: (i) a regime of fully developed turbulence appearing at intermediate values of collisionality and β, with turbulence driven by resistive ballooning modes, related to the L-mode operation of tokamaks, (ii) a regime of reduced turbulent transport at low collisionality and large heat source, with turbulence driven by drift-waves, related to a high-density H-mode regime, (iii) a regime of extremely large turbulent transport at high collisionality, which is associated with the crossing of the density limit, and (iv) a regime above the ideal ballooning limit at high β, with global modes affecting the dynamics of the entire confined region, which can be associated with the crossing of the β limit. The transition from the reduced to the developed turbulent transport regime is associated here with the H-mode density limit, and an analytical scaling law for maximum edge density achievable in H-mode is obtained. Analogously, analytical scaling laws for the crossing of the L-mode density and β limits are provided and compared to the results of GBS simulations.

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Tibone, F., J. W. Connor, T. E. Stringer, and H. R. Wilson. "An assessment of theoretical models based on observations in the JET tokamak. II. Heat transport due to electron drift waves, electromagnetic and resistive fluid turbulence, and magnetic islands." Plasma Physics and Controlled Fusion 36, no. 3 (March 1, 1994): 473–512. http://dx.doi.org/10.1088/0741-3335/36/3/008.

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Perks, Conor, Saskia Mordijck, Troy Carter, Bart Van Compernolle, Stephen Vincena, Giovanni Rossi, and David Schaffner. "Impact of the electron density and temperature gradient on drift-wave turbulence in the Large Plasma Device." Journal of Plasma Physics 88, no. 4 (August 2022). http://dx.doi.org/10.1017/s0022377822000630.

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In this paper we present an experimental study of edge turbulence in the Large Plasma Device at UCLA. We utilize a scan of discharge power and prefill pressure (neutral density) to show experimentally that turbulent density fluctuations decrease with decreasing density gradient, as predicted for resistive drift-wave turbulence (RDWT). As expected for RDWT, we observe that the cross-phase between the density and potential fluctuations is close to 0. Moreover, the addition of an electron temperature gradient leads to a reduction in the amplitude of the density fluctuations, as expected for RDWT. However, counter to theoretical expectations, we find that the potential fluctuations do not follow the same trends as the density fluctuations for changes either in density gradients or the addition of a temperature gradient. The disconnect between the density and potential fluctuations is connected to changes in the parallel flows as a result of differences in the prefill pressure, i.e. neutral density. Further analysis of the density and potential fluctuation spectra show that the electron temperature gradient reduces the low frequency fluctuations up to $10 \,{\rm kHz}$ and the introduction of a temperature gradient leads to an unexpected ${\sim }{\rm \pi}$ shift of the density–potential cross-phase at ${\sim }10\,{\rm kHz}$ , while maintaining the typical resistive drift-wave cross-phase at lower frequencies. These experiments partly confirm existing knowledge on resistive drift-wave turbulence, but also introduce new observations that indicate a need for dedicated nonlinear three-dimensional turbulence simulations that include neutrals.

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Stagni, Adriano, Nicola Vianello, Cedric Kar-Wai Tsui, Claudia Colandrea, Sophie Gorno, Matthias Bernert, Jose A. Boedo, et al. "Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV." Nuclear Fusion, July 19, 2022. http://dx.doi.org/10.1088/1741-4326/ac8234.

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Abstract A set of high density, highly shaped H-mode discharges has been performed in the TCV tokamak with the aim of assessing the effects of increasing divertor neutral recycling on the properties of upstream inter-ELM scrape-off layer (SOL) profiles and transport. An increase of divertor neutral pressure has been correlated with the evolution of separatrix properties and turbulence level. The latter has been quantified by means of the αt parameter introduced in [T. Eich et al 2020 Nuclear Fusion 60 056016], describing the contribution of resistive-interchange turbulence in the SOL relative to drift wave transport. The analysis reveals a general broadening of the upstream SOL profiles as αt increases, with the SOL power width measured by the vertical IR thermography system increasing significantly. In a similar way, the upstream density profile widens in the near SOL, whereas in the far SOL a density shoulder is observed to progressively form and increase in amplitude. This behaviour is associated with an enhancement of far SOL turbulent transport in the form of blob-filaments travelling radially faster across the far SOL and becoming bigger at higher αt. The detected filaments, evaluated from the fast reciprocating probe at the outer midplane, are determined to mostly belong to the Resistive Ballooning and Resistive X-point regimes.

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Kondo, Shintaro, and Atusi Tani. "Almost-periodic solutions to an initial boundary value problem for model equations of resistive drift wave turbulence." ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, March 31, 2016, 291–333. http://dx.doi.org/10.2422/2036-2145.201305_005.

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