Strange Quasi-Repeller in a Kicked Rotor

A new kind of crisis was observed in a system where a transition from conservative to quasi-dissipative can be observed. The crisis signifies a sudden and intrinsic change of a stochastic web, which is formed by the end-results of the images of the discontinuous borderlines of the system function. In the crisis, a strange quasi-repeller can be defined. When changing the controlling parameter, the variation of the fractile dimension of the quasi-repeller obeys a logarithmic rule.     

Gamow-Teller Resonance in a Relativistic Approach

We establish the formalism of nuclear spin-isospin excitations, especially the Gamow-Teller (GT) resonance in a fully consistent relativistic random phase approximation. A relativistic form of the Landau-Migdal parameter g'=0.6 is adopted as a residual sp…     

Alfvén continuum in the presence of a magnetic island in a cylinder configuration

In this work, the effect of a magnetic island on Alfvén waves is studied. A physical model is established wherein Alfvén waves propagate in the presence of a magnetic island in a cylindrical geometry. The structure of the Alfvén wave continuum is calculated by considering only the coupling caused by the periodicity in the helical angle of the magnetic island. The results show that the magnetic island can induce an upshift in the Alfvén continuum. Moreover, the coupling between different branches of the continuous spectrum becomes more significant with increasing continuum mode numbers near the boundary of the magnetic island.     

Edge Effect in Coolant Radiolysis in a VVÉR Core

Calculations are performed of the concentration of oxidizers of radiolytic origin (O₂, H₂O₂, and O₂ ^–) in a VVÉR first loop with hydrogen water chemistry and a different temporal dropoff law for the absorbed dose rate in the coolant at the core exit. It is shown that a linear or exponential dropoff of the dose rate on the segment of the first loop corresponding to a coolant residence time of 0.1 sec results in a lower concentration of radiolytic oxygen and hydrogen peroxide in the first loop outside the core by at least a factor of 10. 3 figures, 10 references.     

Study of Pairing Interaction in a Separable Force

We adopt Duguet new method, which derives a separable form of the pairing interaction from a complicated pairing interaction in nuclear matter. With a given pairing interaction, one could solve the BCS gap equation and obtain the corresponding gaps at various densities, or Fermi momenta in nuclear matter. The relationship between the gap and the Fermi momentum accounts for the properties of pairing correlations. Duguet suggested a separate expression with a product of two exactly same Gaussian forms and fitted the gap closure of the AV18 bare NN interaction. The expression is extremely simple with only two oarameters.     

Low-Frequency Waves in a Magnetized Collisional Dusty Plasma

1.IntroductionAdustyplasmaisathree-componentplasmacon-sistingofelectrons,ionsandmassivesoliddustgrainsheldinsuspension.Thegrainsusua1lychargeneg-ativelytoalargevaIue[l].TheycommonlyoccurinspaceaJswellaslaboratory.Intypicallaboratoryplasmasthedustgralnsacquireanegativechargeduetoadominantcollectionofthemoremobileelec-trons.Atypicalisolated1pm-sizedustgraininaplasmawi1lhaveamasscorrespondingto1O12protonmass(m.)andachargeofafewthousandelectrons[2].lntroducingofathirdcomponentwlthh1ghlychargedan…     

Electron Transport Behavior in a Mirror Magnetic Field and a Uniform Electric Field

1.IntroductIOnMuchefforthasbeenpaidontheresearchabouttheglowdischargeofplasma.Low--temperatureandlow-pressuregaseousglowdischargeplasmasarewidelyusedinanumberofapplications,suchasplasmachemicalvapordeposition(PCVD),plasmaetching,plasmadisplay,gaslaser,andplasmasputtering.Someexperimentalresultshaveshownthatinglowdischargeplasmatheelectrontransportbehaviorscanbecontrolledbyamagneticfield.Fukumasaet.al.[1]showedthatmagneticfieldcouldbeusedtocontroltheelectrontransportbehaviorsindischargeplasm…     

Study of Pairing Interaction in a Separable Force

We adopt Duguet new method, which derives a separable form of the pairing interaction from a complicated pairing interaction in nuclear matter. With a given pairing interaction, one could solve the BCS gap equation and obtain the corresponding gaps at various densities, or Fermi momenta in nuclear     

The Electron Trajectory in a Relativistic Femtosecond Laser Pulse

In this report, we start from Lagrange equation and analyze theoretically the electron dynamics in electromagnetic field. By solving the relativistic government equations of electron, the trajectories of an electron in plane laser pulse, focused laser pulse have been given for different initial conditions. The electron trajectory is determined by its initial momentum, the amplitude, spot size and polarization of the laser pulse. The optimum initial momentum of the electron for LSS （laser synchrotron source） is obtained. Linear polarized laser is more advantaged than circular polarized laser for generating harmonic radiation.     

Behaviour of Trichloroethylene Decomposition in a Plasma-Catalytic Combined Process

A nonthermal plasma processing combined with Cr2O3/TiO2 catalyst was applied to the decomposition of trichloroethylene （TCE）. A dielectric barrier discharge reactor was used as the nonthermal plasma reactor. The effects of the reaction temperature and input power on the decomposition of TCE and the formation of byproducts including HCl, Cl2, CO, NO, NO2 and O3 were examined. With an identical input power, the increase in the reactor temperature lowered the decomposition of TCE. The presence of the catalyst downstream the plasma reactor not only enhanced the decomposition of TCE but also affected the distribution of byproducts significantly. However any synergetic effect as a result of the combination of the nonthermal plasma with the catalyst was not observed, i.e., the TCE decomposition ei~ciency in the plasma- catalyst combined system was almost similar to the sum of those obtained with each process. To improve the decomposition of TCE argon as a plasma-assisting gas was added to the feeding gas and a large enhancement in the TCE decomposition was achieved.     

3D MHD Jet in a Non-Uniform Magnetic Field

The purpose of this paper is to present a two-phase 3D magnetohydrodynamics （MHD） flow model that combines the volume of fluid （VOF） method with the technique derived from induced-magnetic-field equations for liquid metal free surface MHD-jet-flow. Analogy between the induced-magnetic-filed equation and the conventional computational fluid dynamics （CFD） equation is made, so that the equation can be conveniently accounted for by CFD. A penalty factor numerical method is introduced in order to force the local divergence-free condition of the magnetic fields and an extension of the void insulating calculation domain is applied to ensure that the induced-magnetic field at its boundaries is null. These simulation results for lithium liquid metal jets under magnetic field configurations of Magnetic Torus （Mtor） and National Spherical Torus Experiment （NSTX） outboard divertor have shown that three dimensional jet can not be annihilated by magnetic braking and its cross-section will deform in such a way that the momentum flux of the jet is conserved. 3D MHD effects from a magnetic field gradient cause return currents to interact with applied magnetic fields and produce unfavorable Lorentz forces. Under 3D applied non-uniform magnetic fields of the divertor, unfavorable Lorentz forces lead to a substantial change in flow pattern and a reduction in flow velocity, with the jet cross-section moving to one side of the jet space. These critical phenomena can not be revealed by 2D models.     

Study of a self-regulated nuclear burn wave regime in a fast reactor based on a thorium–uranium cycle

The possibility of a wave of slow nuclear burning in a fast reactor in thorium–uranium fuel cycle is investigated. The calculations were performed using a model based on the solution of a nonstationary nonlinear diffusion equation for a cylindrical homogeneous reactor using the concept of a radial geometric factor (buckling) and the effective multigroup approximation taking account of the nuclear kinetics of the precursors of delay neutrons and burnup and production of the main nuclides of the thorium–uranium fuel cycle. The calculations showed that the generation and propagation of a wave of nuclear burning traveling with velocity approximately 2 cm/yr are possible in a thorium–uranium medium. However, the addition of even small quantities of a construction material and coolant to the composition of the reactor makes it impossible to obtain the burn wave regime. A self-maintained nuclear burn regime is also established in this case and exists for a long time (∼5 yr), but the system does not transition into a regime with a nuclear burn wave propagating along the axis of the reactor.     

Propagation Properties of Electromagnetic Wave in a Plasma Slab

In this paper, the calculated results about the propagation properties of electromag-netic wave in a plasma slab are described. The relationship of the propagation properties with frequencies of electromagnetic wave, and parameters of plasma (electron temperature, electron density, dimensionless collision frequency and the size of the plasma slab) is analyzed.     

Experimental investigation on pressure-buildup characteristics of a water lump immerged in a molten lead pool

Motivated to understand the pressure-buildup characteristics in a circumstance of a water droplet immerged inside a heavy liquid metal pool, which is a key phenomenon during a Steam Generator Tube Rupture accident of Lead-cooled Fast Reactor,many experiments have been conducted by injecting water lumps into a molten lead pool at Sun Yat-sen University. In order to deepen the understanding of the influence of melt material, this lead experiment was compared with a Lead–Bismuth-Eutectic(LBE) exper...     

Reconstruction of a muon bundle in the JUNO central detector

The Jiangmen Underground Neutrino Observatory(JUNO) is a multi-purpose neutrino experiment. One of the main goals is to determine the neutrino mass ordering by precisely measuring the energy spectrum of reactor antineutrinos. For the detection of reactor antineutrinos, cosmogenic backgrounds, such as9Li/8He and fast neutrons induced by cosmic muons, should be rejected carefully by applying muon veto cuts, which require good muon track reconstruction. With a 20-kton liquid scintillator detector, ...     

Environmental radioactivity level at a mantle factory in eastern Zhejiang

The Y radiation level, alpha potential energy of thoron and alpha surface contamination level at a mantle factory in the east of Zhejiang Province are reported. The measured results show that the additional annual effective dose equivalent absorbed by the worker in some workshops of the factory was higher than 15 mSv-management limit. The alpha surface contamination on the workers' hands in some workshops was 10 times more than the management limit of National Standard (0.04 Bq/cm2). The mantle factory s main danger to body was internal irradiation of a rays from thoron aerosol.     

Electrostatic Modes of Dusty Plasmas in a Uniform Magnetic Field

Electrostatic dusty plasma waves in a uniform magnetic field are studied.Unless the magnetic field is extremely strong,the dust particles can hardly be magnetized,while however,electrons and ions are easily done so.Electrostatic modes in such dusty plasmas can then be investigated by making use of the “Moderately magnetized” assumption of magnetized electrons and ions,and unmagnetized dust particles.In a high frequency range,due to the existence of dust component.both frequencies of Langmuir waves(parallel to the magnetic field)and upper hybrid waves(perpendicular to the field) are reduced.In the frequency range of ion waves,besides the effect on dust-ion-acoustic waves propagating parallel to the magnetic field.the frequency of ion cyclotron waves perpendicular to the magnetic field is also enhanced.In a very low dust frequency range,we find an “ion-cyclotron-dust-acoustic” mode propagating across the field line with a frequency even slower than dust acoustic waves.