The reconstruction with minimized dispersion and controllable dissipation(MDCD) optimizes dispersion and dissipation separately and shows desirable properties of both dispersion and dissipation.A low dispersion finite...
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The reconstruction with minimized dispersion and controllable dissipation(MDCD) optimizes dispersion and dissipation separately and shows desirable properties of both dispersion and dissipation.A low dispersion finite volume scheme based on MDCD reconstruction is proposed which is capable of handling flow discontinuities and resolving a broad range of length *** the proposed scheme is formally second order accurate,the optimized dispersion and dissipation make it very accurate and robust so that the rich flow features encountered in practical engineering applications can be handled properly.A number of test cases are computed to verify the performances of the proposed scheme.
The collision of wake bubbles behind two counterpropagating laser pulses in rarefied plasma is investigated using particle-in-cell simulation. Special attention is paid to the highly nonlinear dynamics of the electron...
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The collision of wake bubbles behind two counterpropagating laser pulses in rarefied plasma is investigated using particle-in-cell simulation. Special attention is paid to the highly nonlinear dynamics of the electrons in the interaction region. It is found that, as the two bubbles approach each other and collide, the electrons in the interaction region first oscillate in a periodic fashion, forming a quasistationary dense electron density ripple with fairly regular spatial structure. At longer times, the electron motion becomes chaotic, and the density grating is gradually smeared. The electrons escape in the transverse direction, and eventually the two bubbles merge to form a single one. The transition of the electron motion from regular to chaotic is confirmed by analytical modeling using test electrons moving in counterpropagating planar electromagnetic waves. The findings shed light on the dynamics of wake-bubble collisions and the complex behavior induced by multiple laser pulses in plasmas.
In order to achieve the high density compression in laser indirect-drive inertial confinement fusion,the implosion symmetry and hohlraum radiation uniformity are strictly *** study the variations of implosion asymmetr...
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In order to achieve the high density compression in laser indirect-drive inertial confinement fusion,the implosion symmetry and hohlraum radiation uniformity are strictly *** study the variations of implosion asymmetry with hohlraum length and time,three kinds of hohlraum lengths are adopted in experiment.X-ray emission from capsule fuel is measured by an X-ray framing *** on measured
We report on electrical and optical properties of p＋-i-n＋ photodetectors/solar cells based on square millimeter arrays of InP nanowires （NWs） grown on InP substrates. The study includes a sample series where the p...
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We report on electrical and optical properties of p＋-i-n＋ photodetectors/solar cells based on square millimeter arrays of InP nanowires （NWs） grown on InP substrates. The study includes a sample series where the p＋-segment length was varied between 0 and 250 nm, as well as solar cells with 9.3% efficiency with similar design. The electrical data for all devices display clear rectifying behavior with an ideality factor between 1.8 and 2.5 at 300 K. From spectrally resolved photocurrent measurements, we conclude that the photocurrent generation process depends strongly on the p^-segment length. Without a p＋-segment, photogenerated carriers funneled from the substrate into the NWs contribute strongly to the photocurrent. Adding a p＋-segment decouples the substrate and shifts the depletion region, and collection of photogenerated carriers, to the NWs, in agreement with theoretical modeling. In optimized solar cells, clear spectral signatures of interband transitions in the zinc blende and wurtzite InP layers of the mixed-phase i-segments are observed. Complementary electroluminescence, transmission electron microscopy （TEM）, as well as measurements of the dependence of the photocurrent on angle of incidence and polarization, support our interpretations.
Nonsequential double ionization （NSDI） processes of nonaligned diatomic molecules N2 and O2 are studied using the S-matrix theory. Our results show that the NSDI process significantly depends on the molecular symmet...
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Nonsequential double ionization （NSDI） processes of nonaligned diatomic molecules N2 and O2 are studied using the S-matrix theory. Our results show that the NSDI process significantly depends on the molecular symmetry and structure. The ratio of NSDI rate to single ionization rate as a function of the field intensity is obtained. It is found that N2 behaves closely with its companion atom Ar in the ratios over the entire intensity range, while O2 exhibits an obvious suppression effect, which is qualitatively consistent with the experiment.
Maximally random jammed (MRJ) sphere packing is a prototypical example of a system naturally poised at the margin between underconstraint and overconstraint. This marginal stability has traditionally been understood i...
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Maximally random jammed (MRJ) sphere packing is a prototypical example of a system naturally poised at the margin between underconstraint and overconstraint. This marginal stability has traditionally been understood in terms of isostaticity, the equality of the number of mechanical contacts and the number of degrees of freedom. Quasicontacts, pairs of spheres on the verge of coming in contact, are irrelevant for static stability, but they come into play when considering dynamic stability, as does the distribution of contact forces. We show that the effects of marginal dynamic stability, as manifested in the distributions of quasicontacts and weak contacts, are consequential and nontrivial. We study these ideas first in the context of MRJ packing of d-dimensional spheres, where we show that the abundance of quasicontacts grows at a faster rate than that of contacts. We reexamine a calculation of Jin et al. [Phys. Rev. E 82, 051126 (2010)], where quasicontacts were originally neglected, and we explore the effect of their inclusion in the calculation. This analysis yields an estimate of the asymptotic behavior of the packing density in high dimensions. We argue that this estimate should be reinterpreted as a lower bound. The latter part of the paper is devoted to Bravais lattice packings that possess the minimum number of contacts to maintain mechanical stability. We show that quasicontacts play an even more important role in these packings. We also show that jammed lattices are a useful setting for studying the Edwards ensemble, which weights each mechanically stable configuration equally and does not account for dynamics. This ansatz fails to predict the power-law distribution of near-zero contact forces, P(f)∼fθ.
With our relativistic eigenchannel R-matrix method R-R-Eigen, the physics parameters of Ne+ in multi channel quantum defect theory (MQDT) are calculated directly, such as eigenchannel quantum defects, transformation m...
With our relativistic eigenchannel R-matrix method R-R-Eigen, the physics parameters of Ne+ in multi channel quantum defect theory (MQDT) are calculated directly, such as eigenchannel quantum defects, transformation matrix etc al. Various physical quantities can then be derived from a straightforward application of the MQDT procedure. Using our proposed projected high dimensional quantum-defect graph (symmetrized) - a generalization of Lu-Fano plots, we can readily determine the accuracies of the calculated MQDT physical parameters (ie. scattering matrix) systematically against the experimental energy levels. Based on the analytical continuation property of short-range scattering matrix below and above threshold, the origin of each resonant peak observed in the experiment can be designated. there is possibility to adjust calculated total photoionization spectra to fit the experiment.
The relativistic beam-plasma system is a fundamental issue in plasma *** resulting two-stream instability and the Weibel instability in the system have been widely investigated to account for the divergence of the rel...
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The relativistic beam-plasma system is a fundamental issue in plasma *** resulting two-stream instability and the Weibel instability in the system have been widely investigated to account for the divergence of the relativistic electron beam(REB)in the fast ***,it is proposed to apply an external magnetic field to control this divergence[1],since strong external magnetic field of the order of kilo-
Firstly, molecular photoelectron holography with circularly polarized laser pulses is investigated Secondly, the coulomb potential effects in strong-field photoelectron holography with midinfrared laser pulses are dis...
Firstly, molecular photoelectron holography with circularly polarized laser pulses is investigated Secondly, the coulomb potential effects in strong-field photoelectron holography with midinfrared laser pulses are discussed.
We investigated the multielectron ionization dynamics of C2H2 subjected to intense few-cycle laser fields with time-dependent Hartree-Fock(TDHF) approach, in which one-center method has been employed with the finite e...
We investigated the multielectron ionization dynamics of C2H2 subjected to intense few-cycle laser fields with time-dependent Hartree-Fock(TDHF) approach, in which one-center method has been employed with the finite element discrete-variable representation(FE-DVR) and *** is found that there exists "inner-orbital resonant enhancing ionization" phenomena if the photon energy is close to the energy gap between the two inner orbitals whose coupling is becoming stronger with increasing laser intensities.
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