Kang S.-J.,Liupanshui Normal University
Astrophysical Journal | Year: 2017
We employ a single-zone leptonic jet model, with synchrotron, synchrotron self-Compton, and external Compton (EC) processes, to reproduce the quasi-simultaneous multi-wavelength spectral energy distributions in active and quiescent states of the narrow-line gamma-ray-loud radio source GB 1310+487. In the case of the EC process, the external seed photons from both the broad line region (BLR) and thedust torus are considered by assuming that the gamma-ray emission region is located at the outside boundary of the BLR and inside the dust torus. Comparing the energy density of external photon fields UBLR obtained by model fitting with that constrained from the BLR observations. We find that the location of the gamma-ray-emitting region of GB 1310+487 can be tightly constrained at the outer edge of the BLR (the dissipation distance of the -ray emission region from central black hole rdiss a few times of RBLR). The ratio of magnetic energy and emitting-electron energy in the radiation blob ( B LB Le) is gradually increased from Flare 1, to Flare 2 to Post-flare, where the magnetic energy increases and the matter energy decreases. These results suggest that the conversion of the magnetic field and the matter (radiation electrons) energy and the location of the -ray emission region (or ambient photon field) may play an important role in different radiation states of GB 1310+487. © 2017. The American Astronomical Society. All rights reserved.
Zhang K.-S.,China Institute of Technology |
Ou W.,China Institute of Technology |
Jiang X.,China Institute of Technology |
Long F.,Guizhou University |
Hu M.,Liupanshui Normal University
Journal of the Korean Physical Society | Year: 2014
In the research field of acoustic propagation in excitable gases, one of the most critical parameters is the vibrational relaxation time, which determines the frequency of the acoustic dispersion step or the absorption maximum. In this paper, the vibrational relaxation equations given by Tanczos [J. Chem. Phys. 25, 439 (1956)] have been applied to calculate the vibrational multi-relaxation times in multi-component gases. The eigenvalues of the energy-transition-rate matrix are proven to be the reciprocals of the multi-relaxation times. Comparisons demonstrate that our relaxation frequencies calculated for various gas compositions, including carbon dioxide, methane, chlorine, nitrogen, and oxygen, agree with the experimental data. © 2014, The Korean Physical Society.
PubMed | Liupanshui Academy of Agricultural science, Liupanshui Normal University and Agricultural Science Institute of Coastal Region of Jiangsu
Type: Journal Article | Journal: Genetics and molecular research : GMR | Year: 2016
The accuracy of quantitative trait loci (QTLs) identified using different sample sizes and marker densities was evaluated in different genetic models. Model I assumed one additive QTL; Model II assumed three additive QTLs plus one pair of epistatic QTLs; and Model III assumed two additive QTLs with opposite genetic effects plus two pairs of epistatic QTLs. Recombinant inbred lines (RILs) (50-1500 samples) were simulated according to the Models to study the influence of different sample sizes under different genetic models on QTL mapping accuracy. RILs with 10-100 target chromosome markers were simulated according to Models I and II to evaluate the influence of marker density on QTL mapping accuracy. Different marker densities did not significantly influence accurate estimation of genetic effects with simple additive models, but influenced QTL mapping accuracy in the additive and epistatic models. The optimum marker density was approximately 20 markers when the recombination fraction between two adjacent markers was 0.056 in the additive and epistatic models. A sample size of 150 was sufficient for detecting simple additive QTLs. Thus, a sample size of approximately 450 is needed to detect QTLs with additive and epistatic models. Sample size must be approximately 750 to detect QTLs with additive, epistatic, and combined effects between QTLs. The sample size should be increased to >750 if the genetic models of the data set become more complicated than Model III. Our results provide a theoretical basis for marker-assisted selection breeding and molecular design breeding.
PubMed | Guizhou University, Liupanshui Normal University and Nanjing Southeast University
Type: | Journal: Scientific reports | Year: 2016
Novel ultra-wideband filtering of spoof surface plasmon polaritons (SPPs) is proposed in the microwave frequency using deep subwavelength planar structures printed on thin and flexible dielectric substrate. The proposed planar SPPs waveguide is composed of two mirror-oriented metallic corrugated strips, which are further decorated with parallel-arranged slots in the main corrugated strips. This compound structure provides deep subwavelength field confinement as well as flexible parameters when employed as a plasmonic waveguide, which is potential to construct miniaturization. Using momentum and impedance matching technology, we achieve a smooth conversion between the proposed SPPs waveguide and the conventional transmission line. To verify the validity of the design, we fabricate a spoof SPPs filter, and the measured results illustrate excellent performance, in which the reflection coefficient is less than -10dB within the -3dB passband from 1.21GHz to 7.21GHz with the smallest insertion loss of 1.23dB at 2.21GHz, having very good agreements with numerical simulations. The ultra-wideband filter with low insertion loss and high transmission efficiency possesses great potential in modern communication systems.
Shao H.-H.,Hunan Normal University |
Shao H.-H.,Liupanshui Normal University |
Guo D.,Hunan Normal University |
Zhou B.-L.,Hunan Normal University |
Zhou G.-H.,Hunan Normal University
Chinese Physics B | Year: 2016
We address velocity-modulation control of electron wave propagation in a normal/ferromagnetic/normal silicene junction with local variation of Fermi velocity, where the properties of charge, valley, and spin transport through the junction are investigated. By matching the wavefunctions at the normal-ferromagnetic interfaces, it is demonstrated that the variation of Fermi velocity in a small range can largely enhance the total conductance while keeping the current nearly fully valley- and spin-polarized. Further, the variation of Fermi velocity in ferromagnetic silicene has significant influence on the valley and spin polarization, especially in the low-energy regime. It may drastically reduce the high polarizations, which can be realized by adjusting the local application of a gate voltage and exchange field on the junction. © 2016 Chinese Physical Society and IOP Publishing Ltd.
Yao W.,Liupanshui Normal University |
Jing J.,Hunan Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2016
We study the holographic entanglement entropy in metal/superconductor phase transition with exponential nonlinear electrodynamics (ENE) in four and five dimensional spacetimes. We find that the holographic entanglement entropy is powerful tool in studying the properties of the holographic phase transition. For the operator [Formula presented], we show that the entanglement entropy in 4-dimensional spacetime decreases in metal phase but changes non-monotonously in superconducting phase with the increase of the ENE parameter. Interestingly, the change of the entanglement entropy in 5-dimensional spacetime for the two phases is monotonous as the ENE factor alters. For the operator [Formula presented], we note that the behavior of entanglement entropy in four and five dimensional spacetimes changes monotonously for the two phases as we tune the strength of the ENE. Furthermore, for both operators, the entanglement entropy in four or five dimensional black hole increases with the increase of the width of the region. © 2016 The Authors
Peng L.-J.,Guizhou University |
Sun T.,Chongqing Entry Exit Inspection and Quarantine Bureau |
Yang Y.-L.,Liupanshui Normal University |
Cai L.,CAS Institute of Microbiology |
And 4 more authors.
Mycoscience | Year: 2013
Twenty-six strains representing three species of Colletotrichum were isolated from leaf and fruit lesions of vitaceous plants in Guizhou and Yunnan provinces, China. The strains were characterized by morphology and phylogenetic analyses of actin, β-tubulin, calmodulin, glutamine synthetase, glyceraldehyde-3-phosphate dehydrogenase and rDNA internal transcribed spacer gene sequences. The combined dataset showed that 20 of 26 strains represented a novel species, the rest being Colletotrichum fructicola (four strains) and Colletotrichum gloeosporioides (two strains). The new species is described herein as Colletotrichum viniferum. Its conidia, compared with similar Colletotrichum species are cylindrical and 12e 16 mm long. Based on pathogenicity tests, C. viniferum caused leaf spots and anthracnose of table grape but was not host-specific. © 2012 The Mycological Society of Japan. Published by Elsevier B.V. All rights reserved.
Kang S.-J.,Liupanshui Normal University |
Kang S.-J.,Huazhong University of Science and Technology |
Zheng Y.-G.,Yunnan Normal University |
Wu Q.,Huazhong University of Science and Technology |
Chen L.,Chinese Academy of Sciences
Monthly Notices of the Royal Astronomical Society | Year: 2016
PKS 1424+240 is a distant very-high-energy gamma-ray BL Lac object with redshift z = 0.601. It has been found that models utilizing pure synchrotron self-Compton (SSC) processes normally need extreme input parameters (e.g. a very low magnetic field intensity and an extraordinarily high Doppler factor) to explain this particular object spectral energy distributions (SEDs). In order to avoid these extreme model parameters, various other models have been proposed (e.g. the two-zone SSC model or lepto-hadronic model). In this work, we employ the traditional one-zone leptonic model after including a weak external Compton component in order to explore the simultaneous multiwavelength SEDs of PKS 1424+240 in both the high (2009) and the low (2013) state. We find that the input parameters of the magnetic field and Doppler factor are roughly consistent with those of other BL Lacs if a weak external photon field from either the broad line region (BLR) or the dust torus is assumed. However, the required energy density of seed photons from the BLR or torus is about three orders of magnitude lower than that the energy density estimated from the observations in luminous quasars (e.g. flat-spectrum radio quasars, FSRQs). This result suggests that the BLR/torus in BL Lacs is much weaker than that of luminous FSRQs (but has not fully disappeared), and that the inverse-Compton process of external photons from the BLR/torus may still play a role even in high-synchrotron-peaked blazars. © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Zheng Y.G.,Yunnan Normal University |
Yang C.Y.,Chinese Academy of Sciences |
Kang S.J.,Liupanshui Normal University
Astronomy and Astrophysics | Year: 2016
Context. Very high-energy (VHE) γ-ray measurements of distant TeV blazars can be nicely explained by TeV spectra induced by ultra high-energy cosmic rays. Aims. We develop a model for a plausible origin of hard spectra in distant TeV blazars. Methods. In the model, the TeV emission in distant TeV blazars is dominated by two mixed components. The first is the internal component with the photon energy around 1 TeV produced by inverse Compton scattering of the relativistic electrons on the synchrotron photons (SSC) with a correction for extragalactic background light absorbtion and the other is the external component with the photon energy more than 1 TeV produced by the cascade emission from high-energy protons propagating through intergalactic space. Results. Assuming suitable model parameters, we apply the model to observed spectra of distant TeV blazars of 1ES 0229+200. Our results show that 1) the observed spectrum properties of 1ES 0229+200, especially the TeV γ-ray tail of the observed spectra, could be reproduced in our model and 2) an expected TeV γ-ray spectrum with photon energy >1 TeV of 1ES 0229+200 should be comparable with the 50-h sensitivity goal of the Cherenkov Telescope Array (CTA) and the differential sensitivity curve for the one-year observation with the Large High Altitude Air Shower Observatory (LHAASO). Conclusions. We argue that strong evidence for the Bethe-Heitler cascades along the line of sight as a plausible origin of hard spectra in distant TeV blazars could be obtained from VHE observations with CTA, LHAASO, HAWC, and HiSCORE. © ESO, 2015.
Zhou X.-Y.,Liupanshui Normal University |
Chen X.,Liupanshui Normal University |
Wang L.-G.,Anshun University
Synlett | Year: 2016
Palladium-catalyzed Wacker-type oxidation of N-Boc indoles for the synthesis of 3-oxyindolines has been developed. The palladium-catalyzed Wacker-type oxidation of N-Boc indoles can readily occur in MeCN using H2O2 as oxidant. And 3-oxyindolines were obtained in medium to high yield. Furtherly, the mechanism of palladium-catalyzed Wacker-type oxidation of N-Boc indoles was proposed. Copyright © 2016, Georg Thieme Verlag. All rights reserved.