A5019619815- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Physics of Superconductivity and Magnetism
- Dust and Plasma Wave Phenomena
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Geomagnetism and Paleomagnetism Studies
- Laser-Matter Interactions and Applications
- FinTech, Crowdfunding, Digital Finance
- Nonlinear Waves and Solitons
- Fusion materials and technologies
- Banking stability, regulation, efficiency
- Astro and Planetary Science
- Catalytic C–H Functionalization Methods
- Stroke Rehabilitation and Recovery
- Microfinance and Financial Inclusion
- Fluid Dynamics Simulations and Interactions
- Advanced X-ray Imaging Techniques
- Private Equity and Venture Capital
- Astrophysics and Star Formation Studies
- Laser Design and Applications
- Numerical methods for differential equations
- Superconducting Materials and Applications
Dalian University of Technology
2014-2024
Guangzhou University of Chinese Medicine
2024
Lingnan University
2021
Ministry of Education of the People's Republic of China
2017
Dalian University
2013-2016
China Academy of Engineering Physics
2012
Lanzhou University of Technology
2012
ABSTRACT Based on automated credit lines to vendors trading Alibaba's online retail platform and a discontinuity in the decision algorithm, we document that vendor's access FinTech boosts its sales growth, transaction level of customer satisfaction gauged by product, service, consignment ratings. These effects are more pronounced for characterized greater information asymmetry about their risk less collateral, which reveals advantage over traditional technology.
Based on automated credit lines to about two million vendors trading Alibaba's online retail platform, and a discontinuity in the decision algorithm, we document that vendor's access FinTech boosts its sales growth, transaction level of customer satisfaction gauged by product, service, consignment ratings. These effects are more pronounced for with (1) sparse information; (2) less collateral; (3) higher distribution costs; (4) weaker debt contract enforceability local regions, all which...
Transition metal-catalyzed direct heteroarene C–H functionalization is a powerful strategy to access derivatives with improved atom and step economy. In addition commonly proposed CMD SEAr models, we...
Abstract The evolution of Kelvin–Helmholtz (KH) instability in the Orion Nebula is studied using a two-dimensional radiation magnetohydrodynamic (MHD) simulation presence in-plane magnetic field parallel to flow direction. linear results show that component can stabilize due increase line tension, while leads reduced compressibility system and enhances growth instability. When interface subjected more pressure, it found greater saturation energy produced, there transfer kinetic thermal...
Abstract Due to the limited capacity capture low-probability features of abnormal objects in long-tail distributions, intelligent and efficient object detection still fails achieve ideal performance practical environments. Therefore, a lightweight method for transmission line corridors is proposed address inter-class distribution differences intra-class attribute imbalance exhibited by objects. It integrates class inherent feature extraction module (CIFEM) self-moving channel attention...
Abstract Synergetic effects of resonant magnetic perturbation (RMP) and electron cyclotron current drive (ECCD) on stabilizing neoclassical tearing mode (NTM) in reversed shear (RMS) tokamak plasmas are numerically investigated based a set reduced MHD equations. For the moderate separation, it is found that explosive burst induced by fast reconnection double (DTM) RMS configuration can be completely suppressed externally applied RMPs. Zonal flows with strong rotating RMP play an important...
Reversed magnetic shear configuration, a key method for improving plasma confinement in advanced tokamaks, is prone to exciting double tearing modes (DTMs) that can severely degrade the confinement. In this letter, we reveal new mechanism of suppressing DTM instability due self-induced Alfvén resonance rotating tokamak plasmas. The linear growth rate reduced from ~SHp-1/3 fast regime ~SHp-3/5 slow single mode regime, where SHp Reynolds number. Instead generating islands at inner rational...
Linear and nonlinear neo-classical double tearing modes (NDTMs) in the reversed magnetic shear configuration with different separations Δrs between two same rational surfaces are numerically studied by means of reduced magnetohydrodynamic simulations, taking into account bootstrap current fractions fb. It is found that case large Δrs, an explosive burst fast reconnection, which was previously observed only intermediate fb = 0 (Ishii Y. et al 2002 Phys. Rev. Lett. 89 205002), can also be...
The synchronization of geodesic acoustic modes (GAMs) and magnetic fluctuations is identified in the edge plasmas HL-2A tokamak. Mesoscale electric (MSEFs) having components a dominant GAM, m/n=6/2 potential are found at same frequency as that (m n poloidal toroidal mode numbers, respectively). temporal evolutions MSEFs clearly show entrainment phase lock between GAM fluctuations. results indicate GAMs can transfer energy through nonlinear synchronization. Such may also contribute to...
The rotation profile effects on self-suppressing double tearing modes (DTMs) via Alfvén resonance in rotating tokamak plasmas with reversed magnetic shear are numerically investigated using a reduced magnetohydrodynamic model. synergetic of and flow suppressing the DTMs addressed. It is found that resonances both sides inner rational surface r s 1 decouple strongly coupled DTMs, simultaneously further stabilizes instability outer 2 . When stabilized so significantly it becomes less unstable...
The control of neo-classical tearing modes (NTMs) by the differential rotation in reversed magnetic shear (RMS) configuration with different separations between two rational surfaces is numerically studied means reduced magnetohydrodynamic (MHD) simulations. It found that a strong at outer resonant surface can effectively suppress explosive burst double (DTMs)/NTMs. Critical values strength to are also presented for bootstrap current fractions . Furthermore, couple measurable parameters ,...
Abstract This paper reviews the effects of resonant magnetic perturbation (RMP) on classical tearing modes (TMs) and neoclassical (NTMs) from theory, experimental discovery numerical results with a focus four major aspects: (i) mode mitigation, where TM/NTM is totally suppressed or partly mitigated by use RMP; (ii) penetration, which means linearly stable triggered externally applied (iii) locking, namely an existing rotating island braked finally stopped (iv) unlocking, as name suggests, it...
Scaling laws of fast growth collisionless double tearing modes in the linear phase are studied numerically by a reduced magnetohydrodynamics model cylindrical plasma. It is found that case ρ s ≪ d e , with electron inertial skin depth and ion sound gyroradius, scaling rate changes gradually from to as rational surface separation Δ r increases. In on other hand, shifts or small regime, furthermore, it shown for short wavelength unstable modes, their poloidal mode number varies similar does....
Multiscale interactions between the tearing mode (TM) and ion temperature gradient (ITG) turbulence are studied numerically using a self-consistent gyrofluid model in slab geometry. It is found that multiscale system goes through five distinct phases then saturated dynamic quasi-steady state. During nonlinear evolution, macroscale TM microscale ITG can mutually destabilize each other. On one hand, fluctuation level of greatly raised when magnetic island grows beyond threshold. The...
Abstract Plasma perturbations from the core and/or boundary regions of tokamaks can provide seed islands for excitation neo-classical tearing modes (NTMs) with negative <?CDATA ${{ \Delta }^{\prime}}$ ?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:mrow> <mml:msup> <mml:mi mathvariant="normal">Δ</mml:mi> </mml:mrow> <mml:mo>′</mml:mo> </mml:msup> </mml:mstyle> </mml:math> , where is linear instability parameter classical...
Abstract An explosive burst excited by a neoclassical tearing mode (NTM) is one of the possible candidates for disruptive terminations in reversed magnetic shear (RMS) tokamak plasmas. For purpose disruption avoidance, numerical investigations have been implemented on prevention bursts triggered ill-advised application electron cyclotron current drive (ECCD) RMS configuration. Under situation controlling NTMs ECCD plasmas, threshold driven has found. Below threshold, not only are NTM islands...
The suppression of explosive bursts, triggered by the neo-classical tearing mode, in reversed magnetic shear configuration tokamak plasmas electron cyclotron current drive (ECCD) are numerically studied making use a reduced magnetohydrodynamic model including both bootstrap and self-consistently evolving EC driven current. It is found that ECCD with appropriate input power switch-on time can effectively stabilize islands. In comparison classical one, it far more difficult to control island...
The Monte Carlo transport code Geant4 has been used to study positron production in the of laser-produced hot electrons solid targets. dependence yield on target parameters and hot-electron temperature investigated thick targets (mm-scale), where only Bethe-Heitler process is considered. results show that Au best material, an optimal thickness exists for generating abundant positrons at a given temperature. angular distributions energy spectra different electron temperatures were studied...
Reversed magnetic shear (RMS) configuration is assumed to be the steady-state operation scenario for future advanced tokamaks like International Thermonuclear Experimental Reactor. In this work, we numerically discover a phenomenon of violent intermittent bursts induced by self-organized double tearing mode (DTM) reconnection in RMS during very long evolution, which may continuously lead annular sawtooth crashes and thus badly impact desired tokamaks. The key process off-axis region similar...
Roles of poloidal rotation in stabilizing the m/n=1/1 kink-tearing mode and exciting its high-order harmonic tearing modes are numerically investigated by using a reduced magnetohydrodynamic model. It is found that modes, such as m/n=2/2, m/n=3/3, or even much higher-m harmonics, can be destabilized so significantly shear to more unstable than comparable mode. Moreover, short wave-length Kelvin- Helmholtz (KH) instabilities excited large regime. The scaling power laws linear growth rate for...
Nonlinear evolution of multiple double tearing modes (multi-DTMs) with different helicities (DHs) in several reversed magnetic shear configurations is investigated by employing a reduced magnetohydrodynamic model cylindrical geometry. It found that the basic characterizations nonlinear process system depend on linear unstable spectrum multi-DTMs DHs. In case growth rates DHs are comparable to each other, continuous bursts occur one after another due sequence energy release induced...
ABSTRACT We show that in systems with multiple current sheets, the reconnection rate can increase increasing S . This is essentially different from result single sheet where usually decreases or independent of Such a resistive fast be applied to account for rapid events astrophysical, solar, and magnetic fusion plasmas.
Abstract Effect of shear flow on the multi-scale nonlinear interaction in plasmas is numerically investigated by using a self-consistent Landau-fluid model. Dual roles process are discovered, significantly suppressing micro-scale fluctuations and dramatically promoting macro-scale fluctuations. Furthermore, its similar dual turbulent transport also demonstrated. The novel underlying mechanism for promotion identified as formation large vortex inside magnetic island, which common phenomenon...
Within the framework of a reduced collisionless magnetohydrodynamics (MHD) model containing effects electron inertia and pressure gradient, scaling laws strongly coupled q=2 triple tearing instabilities with broad linear spectra in tokamak plasma are studied numerically. It is found that as poloidal mode number m increases, power growth rate modes (TTMs) on SHp, de, ρs change gradually from scalings to standard single (STM) scalings, where SHp magnetic Reynolds number, de inertial skin...
The effect of q-profiles on the excitation high-order harmonic q=1 tearing modes during sawtooth crashes is investigated by a collisionless fluid model with electron inertia term in Ohm’s law. It found that for flat q-profile core region, harmonics, such as m/n=2/2 and/or m/n=3/3 modes, comparable to or stronger than m/n=1/1 component, can be excited tokamak sawteeth. magnetic shear surface is, more unstable higher-m are. For smoothly monotonously increased q-profiles, lower q value plasma...