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Your search keyword '"Xiao-jun, Zhang"' showing total 8 results
Start Over Author "Xiao-jun, Zhang" Journal chinese physics letters
8 results on '"Xiao-jun, Zhang"'

1. 1 S 0 Nucleon Superfluidity in Neutron Star Matter

Author

Cunbo Fan, Xingwei Han, Guang-Zhou Liu, Yan Xu, Xiao-Jun Zhang, Cheng-Zhi Liu, Hong-Yan Wang, and Ming-Feng Zhu

Subjects
Condensed Matter::Quantum Gases, Physics, Particle physics, Isovector, Proton, Meson, Nuclear Theory, General Physics and Astronomy, BCS theory, Nuclear physics, Superfluidity, Neutron star, Pairing, Nuclear Experiment, Nucleon
Abstract

We investigate the nucleon superfluidity in the 1S0 channel in neutron star matter using the relativistic mean field theory and the BCS theory. We discuss particularly the influence of the isovector scalar interaction which is considered by exchanging δ meson on the nucleon superfluidity. It is found that the δ meson leads to a growth of the nucleon 1S0 pairing energy gaps in a middle density range of the existing nucleon superfluidity. In addition, when the density ρB > 0.36 fm−3, the proton 1S0 pairing energy gap obviously decreases. The density range of the proton 1S0 superfluidity is narrowed due to the presence of δ mesons. In our results, the δ meson not only changes the EOS and bulk properties but also changes the cooling properties of neutron stars.

Published
2013
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2. Controlled Photonic Stop Bands in a Four-Level Atomic System of an Inhomogeneously Broadened Solid

Author

Cheng-Zhi Liu, Jin-Hui Wu, Cunbo Fan, Xingwei Han, Xiao-Jun Zhang, Lili Han, and Jin-Yue Gao

Subjects
Materials science, business.industry, Band gap, Doping, Tripod (photography), General Physics and Astronomy, chemistry.chemical_element, Yttrium, Standing wave, chemistry.chemical_compound, Optics, chemistry, Optoelectronics, Orthosilicate, Photonics, business, Photonic crystal
Abstract

A neatly controllable photonic band gap formed in a four-level tripod system in the solid material, Pr3+ -doped yttrium orthosilicate (Pr:YSO) is investigated. Driven by two standing waves, the sample is just like a photonic crystal to the weak probe. Based on the numerical simulation and the analytic result we present a clear and full-scale view on the induced band gap in the inhomogeneously broadened tripod system.

Published
2013
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6. High Efficiency Grating Coupler for Coupling between Single-Mode Fiber and SOI Waveguides.

Author

Can, ZHANG, Jing-Hua, SUN, XIAO Xi, Wei-Min, SUN, Xiao-Jun, ZHANG, Tao, CHU, Jin-Zhong, YU, and Yu-De, YU

Subjects
SILICON-on-insulator technology, WAVEGUIDES, SINGLE-mode optical fibers, BANDWIDTHS, LIGHTING reflectors, COMPLEMENTARY metal oxide semiconductors
Abstract

A high efficiency grating coupler between single-mode fiber and silicon-on-insulator waveguide is designed by a formula method. Over 78.5% coupling efficiency (>-1.05 dB) with 3 dB bandwidth about 50nm for one grating coupler is obtained experimentally and this result is the highest one as far as we know. This grating coupler is CMOS compatible which needs only one etch-step and is designed for a standard SOI chip without any Bragg reflector or bottom reflector. [ABSTRACT FROM AUTHOR]

Published
2013
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7. Visualization of Fiber Moving in Air Tunnel with Velocity Gradient*.

Author

Yang Miao, Xiang Guo, and Xiao-Jun Zhang

Subjects
TUNNEL design & construction, FLOW velocity, FIBERS, VELOCITY, VISUALIZATION
Abstract

To measure the parameters of fiber and to visualize the reshaping process of fiber in air tunnel, an experimental approach is developed in the present work. The tunnel is designed with gradient flow velocity, and the fiber reshaping images as well as the fiber length value are obtained experimentally. An analytical expression of velocity distribution in the tunnel is theoretically derived and the simulated results are obtained. Automatic fiber reshaping including stretch and rotation is verified using the dynamical equation and the multi-spherical chain model. It is shown that pull force by air flow makes a chain of balls become straight and Stokes moment makes the ball chain rotate. Finally, reshaping criterion related with flow velocity is formulated. [ABSTRACT FROM AUTHOR]

Published
2020
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