Microbial reduction of Fe(III) in smectite minerals by thermophilic methanogen Methanothermobacter thermautotrophicus
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Jing, Zhang↗
Engineering topics
Jing, Zhang
Publications and source records attributed to Jing, Zhang.
Sub-microsecond pulsed atmospheric glow discharges with and without dielectric barrier
The discharge characteristics and mechanism of glow discharges in atmospheric pressure helium excited by repetitive voltage pulses with and without dielectric barriers are numerically studied using a one-dimensional self-consistent fluid model. The waveforms of discharge current density show that one discharge event occurs during the voltage pulse with bare electrodes and two distinct discharge events happen at the rising and falling phases of voltage pulse with dielectric barrier electrodes, respectively. The spatial profiles of electron and electric field at the time instant of discharge current peak reveal that the electrons are trapped in the plasma bulk with bare electrodes, while the electrons are accumulated in the region between the sheath and plasma bulk with dielectric barrier electrodes. Furthermore, the spatio-temporal evolution of electron density and mean electron energy clearly demonstrate the dynamics of discharge ignition, especially the temporal evolution of sheath above the instantaneous cathode.
70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
Electronic and optical properties of TiCoSb under different pressures
The electronic structure and optical properties of TiCoSb are studied by the first-principles calculation. It is found that the band gaps increase with the pressure increasing. It is noted that the increase of the band gap is due to the electrons of Ti 3d and Co 3d of the valence band (VB) shifting away from the Fermi level. Our calculation indicates that TiCoSb has the large density of state near the Fermi level; moreover, the changes of the density of states near the Fermi level mainly are caused by Ti 3d and Co 3d under the different pressures. It is noted that the absorption edge increases with an increase of pressure. As pressure increases, the static dielectric constants {epsilon}{sub 1}(0) decrease. All peaks of the imaginary part of the dielectric function {epsilon}{sub 2}({omega}) move towards higher energies within increasing pressure. - Graphical abstract: The first peak positions of the absorption spectrum increase and shift the high energy with an increase of pressure. The buleshift of the absorption edge could be observed. Highlights: Black-Right-Pointing-Pointer It is noted that the increase of the band gap is due to the electrons of Ti 3d and Co 3d of VB moving away from the Fermi level. Black-Right-Pointing-Pointer It is noted that the absorption edge increases with an increase of pressure. Black-Right-Pointing-Pointer As pressure increases, the static dielectric constant {epsilon}{sub 1}(0) decreases. Black-Right-Pointing-Pointer All peaks of the imaginary part of the dielectric function {epsilon}{sub 2}({omega}) move to wards higher energies within creasing pressure.
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
Bose-Einstein condensate in a light-induced vector gauge potential using 1064-nm optical-dipole-trap lasers
Using two crossed 1064-nm optical-dipole-trap lasers to be the Raman beams, an effective vector gauge potential for Bose-Einstein condensed {sup 87}Rb in the F=2 hyperfine ground state is experimentally created. The moderate strength of the Raman coupling still can be achieved when the detuning from atomic resonance is larger than the excited-state fine structure, since rubidium has 15 nm energy-level spitting. The atoms at the far detuning of the Raman coupling are loaded adiabatically into the dressed states by ramping the homogeneous bias magnetic field with different paths and the dressed states with different energies are studied experimentally. The experimental scheme can be easily extended to produce the synthetic magnetic or electric field by means of a spatial or time dependence of the effective vector potential.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Observation of Collective Atomic Recoil Motion in a Degenerate Fermion Gas
We demonstrate collective atomic recoil motion with a dilute, ultracold, degenerate fermion gas in a single spin state. By utilizing an adiabatically decompressed magnetic trap with an aspect ratio different from that of the initial trap, a momentum-squeezed fermion cloud is achieved. With a single pump pulse of the proper polarization, we observe, for the first time, multiple wave-mixing processes that result in distinct collective atomic recoil motion modes in a degenerate fermion cloud. Contrary to the case with Bose condensates, no pump-laser detuning asymmetry is present.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Continuous-variable multipartite unlockable bound entangled Gaussian states
We investigate continuous-variable (CV) multipartite unlockable bound entangled states. Comparing with the qubit multipartite unlockable bound entangled states, CV multipartite unlockable bound entangled states present some new and different properties. CV multipartite unlockable bound entangled states may serve as a useful quantum resource for new multiparty communication schemes. The experimental protocol for generating CV unlockable bound entangled states is proposed with a setup that is, at present, accessible.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
FePt:C/Fe graded and nongraded films with controllable coercivity fabricated by magnetron sputtering and postannealing
Graded and nongraded FePt:C(hard)/Fe(soft) films with different structures are fabricated by magnetron sputtering and postannealing. Due to the interdiffusion between FePt and C layers during the annealing process, films with a continuous variation in anisotropy are realized by varying the C concentration in the FePt hard layer. In comparison to the FePt/Fe bilayer, the coercivities of graded and nongraded films are effectively reduced. However, the mechanisms of reduction are different. Moreover, adding a nonmagnetic C layer not only tailors the gradient of anisotropy, but also weakens the intergranular exchange interaction.
36 MATERIALS SCIENCE↗
An experimental study on discharge mechanism of pulsed atmospheric pressure glow discharges
The discharge mechanism of pulsed atmospheric pressure glow discharges excited by the unipolar positive voltage pulses between two parallel plate electrodes with or without one dielectric barrier on the ground electrode in flowing helium has been characterized by nanosecond time resolved optical and electrical measurements. The uniform glow discharges can only be achieved when the voltage pulse duration is less than 1 {mu}s with bare electrodes. With introducing a dielectric barrier on the ground electrode, a model of electrons traveling on the background ions between two discharge events is proposed to explain the discharge mechanism and characteristics in terms of discharge ignition, discharge spatial profile and discharge current amplitude.
70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗