Pingyuan, China

Shangqiu Normal University

www.sqnc.edu.cn
Pingyuan, China

Shangqiu Normal University , formerly known as Shangqiu Teachers' College, is a public university in the city of Shangqiu, in Henan Province of China. As a key university in Henan Province, it is a comprehensive local university with salient features of teacher training and particular strength in liberal arts. The main undertakings of the university are undergraduate education with the chief aim of producing high level application-oriented talents.The institution has a student population of about 12, 000 students, and is divided into two campuses: the Old Campus, and the New Campus. The Old Campus is about 100 years old and houses the University's technical and science related majors: mathematics, computer science, etc. The New Campus, which is finishing construction at the time of this writing, lies less than 1 km away; it houses the University's liberal arts: English, History, Music, etc. Over the next few years, the University plans to acquire land from a military training center on its western boundary, further increasing its size and eventually classifying it as a full-fledged University. Wikipedia.

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Chen W.-C.,Shangqiu Normal University | Chen W.-C.,University of Oxford
Monthly Notices of the Royal Astronomical Society | Year: 2017

Recent timing analysis reveals that the orbital period of the first-discovered accreting millisecond pulsar SAX J1808.4-3658 is increasing at a rate P˙orb = (3.89 ± 0.15) × 10-12 s s-1, which is at least one order of magnitude higher than the value arising from the conservative mass transfer. An ejection of mass-loss rate of 10-9M⊙ yr-1 from the donor star at the inner Lagrangian point during the quiescence state could interpret the observed orbital-period derivative. However, it is unknown whether this source can offer such a high mass-loss rate. In this work, we attempt to investigate an evolutionary channel towards SAX J1808.4-3658. Once the accretion disc becomes thermally and viscously unstable, the spin-down luminosity of the millisecond pulsar and the X-ray luminosity during outbursts are assumed to evaporate the donor star, and the resulting winds carry away the specific orbital angular momentum at the inner Lagrangian point. Our scenario could yield the observed orbital period, the orbital-period derivative, and the peak X-ray luminosity during outbursts. Low-mass X-ray binaries with a 1.0M⊙ donor star, and an orbital period in the range of 0.8-1.5 d, may be the progenitor of SAX J1808.4-3658. Our numerical calculations propose that the current donor-star mass is 0.044M⊙, which is approximately in agreement with the minimum mass of the donor star. In addition, our scenario can also account for the formation of black widows or the diamond planets like PSR J1719-1438. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.


Hu H.,Shangqiu Normal University
Physics of Plasmas | Year: 2017

The photo-ionization processes of an ion moving in fusion plasma are investigated. Bound state wavefunctions are calculated using the Ritz variation method. Continuum state wavefunctions of the photoelectron are constructed using the proposed orthogonalized-spherical wave method. The formula for the photo-ionization cross section is derived. The photo-ionization of a moving ion consists of many ionization channels. Cross sections of the main channels are much larger than those of the other channels. Photo-ionization is influenced by the incident photon energy and ionic speed. © 2017 Author(s).


Liang G.,Shangqiu Normal University
Journal of Modern Optics | Year: 2017

We have introduced a class of spiralling elliptic vortex (SEV) solitons in nonlocal nonlinear media. The SEV soliton has more complicated structures both in its amplitude and in its phase compared with conventional vortex solitons. Different from the circularly symmetric amplitude profile of vortex solitons, the SEV solitons exhibit the elliptic optical spots. Furthermore, the SEV solitons have the special modulated helical phase structures, which make the SEV solitons rotate. For different topological charges, all the SEV solitons own the same critical power, critical cross-term phase coefficient and the critical angular velocity for fixed semiaxis of the elliptic spots. The stability of the SEV solitons is confirmed by the direct numerical simulations with random noises. © 2017 Informa UK Limited, trading as Taylor & Francis Group


News Article | December 9, 2016
Site: www.eurekalert.org

COLUMBUS, Ohio--With a deadly avalanche, it appears climate change may now be affecting a once stable region of the Tibetan Plateau. That's the conclusion of an international team of researchers who have published an analysis of the July 2016 disaster in the Dec. 9 issue of the Journal of Glaciology. On July 17, more than 70 million tons of ice broke off from the Aru glacier in the mountains of western Tibet and tumbled into a valley below, taking the lives of nine nomadic yak herders living there. To perform a kind of forensic analysis of the avalanche, researchers from the Chinese Academy of Sciences joined with two glaciologists from The Ohio State University: Lonnie Thompson, Distinguished University Professor in the School of Earth Sciences and research scientist at the Byrd Polar and Climate Research Center (BPCRC), and Ellen Mosley-Thompson, Distinguished University Professor in Geography and director of BPCRC. The most important fact about the avalanche, said Thompson, is that it lasted only four or five minutes (according to witnesses), yet it managed to bury 3.7 square miles of the valley floor in that time. He said something--likely meltwater at the base of the glacier--must have lubricated the ice to speed its flow down the mountain. "Given the rate at which the event occurred and the area covered, I think it could only happen in the presence of meltwater," Thompson said. Other nearby glaciers may be vulnerable, he added, "but unfortunately as of today, we have no ability to predict such disasters." Researchers could not have predicted, for example, that a neighboring glacier in the same mountain range would give way just two months later, but it did in September 2016. That avalanche appears not to have resulted in any deaths, and the cause is still under investigation. The researchers used satellite data and GPS to get precise measurements of how much ice fell in the first avalanche and the area it covered. They've since pieced together more answers by working with computer modelers who were able to replicate the avalanche virtually. In those simulations, the only condition that led to an avalanche was the presence of meltwater. "We still don't know exactly where the meltwater came from, but given that the average temperature at the nearest weather station has risen by about 1.5 degrees Celsius (2.7 degrees Fahrenheit) over the last 50 years, it makes sense that snow and ice are melting and the resulting water is seeping down beneath the glacier," Thompson said. Glacial collapse is unprecedented in western Tibet, which for decades has resisted the effects of climate change while glaciers in southern and eastern Tibet have melted at an accelerating rate. Increased snowfall has even led to the expansion of some glaciers in western Tibet--and the extra snowfall likely played some role in the avalanche by creating additional meltwater, said Lide Tian, a glaciologist at the Institute of Tibetan Plateau Research of the Chinese Academy of Sciences and lead author of the paper. Co-authors of the paper include Tandong Yao, Yang Gao, Sher Muhammad, Jibiao Zong, Cheng Wang and Sengqiang Jin of the Chinese Academy of Sciences and Zhiguo Li of Shangqiu Normal University. Funding was provided by the National Natural Science Foundation of China, the "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences and Major Special Project-the China High-Resolution Earth Observation System.


Ren J.,Nanjing Southeast University | Ren J.,Shangqiu Normal University | Sun Z.-Z.,Nanjing Southeast University | Zhao X.,Nanjing Southeast University
Journal of Computational Physics | Year: 2013

An effective finite difference scheme is considered for solving the time fractional sub-diffusion equation with Neumann boundary conditions. A difference scheme combining the compact difference approach the spatial discretization and L 1 approximation for the Caputo fractional derivative is proposed and analyzed. Although the spatial approximation order at the Neumann boundary is one order lower than that for interior mesh points, the unconditional stability and the global convergence order O(τ 2 - α + h 4) in discrete L 2 norm of the compact difference scheme are proved rigorously, where τ is the temporal grid size and h is the spatial grid size. Numerical experiments are included to support the theoretical results, and comparison with the related works are presented to show the effectiveness of our method. © 2012.


Zhang J.,Shangqiu Normal University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

In order to strengthen risk assessment and management of the agricultural flood and drought disaster, the flood and drought disaster in Henan province was evaluated in this study with the information diffusion model and risk rank division, and then flood and drought disaster possibilities at different levels, as well as the characteristics of temporal and spatial distribution were obtained. The results showed that the risk probability of floods and drought disaster of Henan province were all larger, and the risk probability, risk rank, disaster forming area was larger than that of flood. The risk probability of floods increased from northwest to southeast at spatial-temporal distribution. The higher risk of floods was in west and north of Henan province, and the lower risk of floods was in east and south of Henan province, especially in Huang Huai area. The drought risk was more serious in west and south than that in east and north of Henan province. The lower disk of drought was in Anyang, Xinxiang and Puyang city and higher disk of drought was in west and south of Henan province. The study provides a basis for promotion strategic position of grain core area and disaster prevention in Henan province.


Zeng Q.-G.,Shangqiu Normal University
Nuclear Physics B | Year: 2016

The quintuplet heavy leptons are the typical particles predicted by the TeV scale seesaw model which is proposed as a viable and testable solution to the neutrino masses problem. The observation of these particles might be regarded as a direct evidence of the new model. In this paper, we investigate production and detection prospects of the quintuplet heavy leptons in the processes e+e-→σ++σ++(σ+σ+) and e+e-→Zσ++σ++(Zσ+σ+) at the ILC. We present the production cross sections and the main kinematic distributions of the various observables. Our numerical results show that the values of cross sections can reach a few hundreds of fb. We also study the possible final state signals of quintuplet heavy leptons and relevant SM backgrounds. Due to high produced rate and small SM backgrounds, the possible signals of quintuplet heavy leptons might be detected via some processes in the future ILC experiments. © 2016 The Author.


Gao X.,Shangqiu Normal University
International Journal of Biomedical Engineering and Technology | Year: 2013

This paper proposes an effective retinal vessel segmentation method based on a combination of line detectors at different scales. To decrease the influence of optic disc and enhance retinal vessel (especially small vessel) response for each retinal image, the proposed method first applies a top-hat transform and a line filter to the background homogenised retinal image. Then an improved multi-scale detection is used to produce a vascular response image for each retinal image. Since the contribution of different lengths of line detectors to vessel response is not equal, the improved multi-scale detection combines all line responses at varying scales by their contribution to vessel response. The performance of the proposed method is evaluated on two publicly available DRIVE, STARE databases. Experimental results demonstrate that our method achieves high accuracy and approximates the average accuracy of a human observer without a significant degradation of sensitivity and specificity. © 2013 Inderscience Enterprises Ltd.


Gao X.,Shangqiu Normal University
International Review on Computers and Software | Year: 2013

Inspection of the retinal vasculature may reveal precursors of serious diseases such as hypertension, diabetes, cardiovascular disease and stroke. In this paper an effective method for automatically extracting the vascular network in retinal images is presented. The proposed method is based on a multi-scale line detection, which is the line responses at varying scales. Linearly combining these line responses produces the final segmentation for each retinal image. The multi-scale line detection is applied on a vessel enhanced image whose noise and optic disc is removed and the contrast of blood vessels (including thin vessels) is enhanced by top-hat transformation and line detector filter. The preprocessing with retinal image results in the response of thin vessels with multi-scale detection is more sensitive and free from the influence of the optic disc, so the proposed method can get the very detail vascular tree in segmentation results. The performance of the proposed method was evaluated on two publicly available DRIVE, STARE databases. Experimental results have also shown the proposed method achieves high local accuracy (a measure to assess the accuracy at regions around the vessels) and approximates the average accuracy of a human observer. Moreover, the method is simple, fast, and robust to noise, so suitable for being integrated into a computer-assisted diagnostic system for ophthalmic disorders. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.


Li Y.-M.,Shangqiu Normal University
Chinese Physics Letters | Year: 2010

We study the perturbation to symmetries and adiabatic invariants of a generalized Birkhoff system. Based on the invariance of differential equations under infinitesimal transformations, Lie symmetries, laws of conservations, perturbation to the symmetries and adiabatic invariants of the generalized Birkhoff system are presented. First, the concepts of Lie symmetries and higher order adiabatic invariants of the generalized Birkhoff system are proposed. Then, the conditions for the existence of the exact invariants and adiabatic invariants are proved, and their forms are given. Finally, an example is presented to illustrate the method and results. © 2010 Chinese Physical Society and IOP Publishing Ltd.

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