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Peng Z.Y.,Yunnan Normal University | Yin Y.,Liupanshui Normal College | Bi X.W.,Honghe University | Zhao X.H.,CAS National Astronomical Observatories | And 3 more authors.
Astrophysical Journal | Year: 2010

In this paper, we have analyzed the temporal and spectral behavior of 52 fast rise and exponential decay (FRED) pulses in 48 long-duration gamma-ray bursts (GRBs) observed by the CGRO/BATSE, using a pulse model with two shape parameters and the Band model with three shape parameters, respectively. It is found that these FRED pulses are distinguished both temporally and spectrally from those in the long-lag pulses. In contrast to the long-lag pulses, only one parameter pair indicates an evident correlation among the five parameters, which suggests that at least four parameters are needed to model burst temporal and spectral behavior. In addition, our studies reveal that these FRED pulses have the following correlated properties: (1) long-duration pulses have harder spectra and are less luminous than short-duration pulses and (2) the more asymmetric the pulses are, the steeper are the evolutionary curves of the peak energy (Ep) in the ?f? spectrum within the pulse decay phase. Our statistical results give some constraints on the current GRB models. © 2010. The American Astronomical Society. All rights reserved.


Peng Z.Y.,Yunnan Normal University | Yin Y.,Liupanshui Normal College | Bi X.W.,Honghe University | Bao Y.Y.,Yuxi Normal College | Ma L.,Yunnan Normal University
Astronomische Nachrichten | Year: 2011

Assuming an intrinsic 'Band' shape spectrum and an intrinsic energy-independent emission profile we have investigated the connection between the evolution of the rest-frame spectral parameters and the spectral lags measured in gamma-ray burst (GRB) pulses by using a pulse model. We first focus our attention on the evolution of the peak energy, E0,p, and neglect the effect of the curvature effect. It is found that the evolution of E0,p alone can produce the observed lags. When E0,p varies from hard to soft only the positive lags can be observed. The negative lags would occur in the case of E0,p varying from soft to hard. When the evolution of E0,p and the low-energy spectral index α0 varying from soft to hard then to soft we can find the aforesaid two sorts of lags. We then examine the combined case of the spectral evolution and the curvature effect of fireball and find the observed spectral lags would increase. A sample including 15 single pulses whose spectral evolution follows hard to soft has been investigated. All the lags of these pulses are positive, which is in good agreement with our theoretical predictions. Our analysis shows that only the intrinsic spectral evolution can produce the spectral lags and the observed lags should be contributed by the intrinsic spectral evolution and the curvature effect. But it is still unclear what cause the spectral evolution. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ai D.,Liupanshui Normal College | Zhu X.,Shandong University of Science and Technology
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

A VEC model which lncludes four coherent variables tested by unit test and co-integration test for the study of China's total amount of coal production was set up, the fitted value for history of the model was satisfactory through tested. The paper predicted total amount of coal production by the model, got important conclusions through the analysis of the simulation results. At last put forward relevant measures and developing goal. © 2010 IEEE.


Yang Y.,Guizhou Academy of Agricultural science | Yang Y.,Liupanshui Normal College | Cal L.,CAS Institute of Microbiology | Yu Z.,Huazhong Agricultural University | And 3 more authors.
Cryptogamie, Mycologie | Year: 2011

Twenty-two strains of Colletotrichum, representing eight species, were isolated from eight genera of Orchidaceae in Yunnan and Guizhou provinces in China. Fourteen strains were from lesions and are pathogens, four were from fallen/dead flowers or stems and four were isolated as endophytes. The strains are characterized through morphological studies and multilocus phylogenetic analysis (ACT, Tub 2, CAL, CHS I, GPDH and ITS). Colletotrichum orchidearum and the new species Colletotrichum karstii are described and illustrated, based on morphological characters and multilocus sequence data. Collections of the other Colletotrichum species are reported with notes. © 2011 Adac. Tous droits r6serv6s.


Su C.,Liupanshui Normal College | Qiu X.,Zhejiang Academy of Agricultural Sciences | Ji Z.,Zhejiang Academy of Agricultural Sciences
Molecular Breeding | Year: 2013

Along with the development and integration of molecular genetics and quantitative genetics, many quantitative trait locus (QTL) mapping studies have been conducted using different mapping populations in various crop species. Existing QTLs can be used for marker-assisted breeding and map-based cloning, whereas the false-positive QTLs are no use. The purpose of this study is to evaluate the suitability of different mapping procedures for data from different genetic models. In this study, four types of recombinant inbred lines (RILs) with different genetic models, viz. additive QTLs (Model I), additive and epistatic QTLs (Model II), additive QTLs and QTL × environment interaction (Model III), additive, epistatic QTLs and QTL × environment interaction (Model IV), were simulated by computer. Six types of QTL mapping procedures, viz. CIM, MIMF, MIMR, ICIM, MQM and NWIM, on four kinds of QTL mapping software, viz. WinQTL Cartographer Version 2. 5, IciMapping Version 2. 0, MapQTL Version 5. 0 and QTLnetwork Version 2. 0, were used for screening QTLs of the simulated RILs. The results showed that different mapping procedures have different suitability for different genetic models. CIM and MQM can only screen Model I data. MIMR, MIMF and ICIM can only screen Model I and Model II data. NWIM can screen all four models' data. It can be concluded that different genetic models' data have different most suitable mapping procedures. In practical experiments where the genetic model of the data is unknown, a multiple model mapping strategy should be used, that is a full model scanning with complex model procedure followed by verification with other procedures corresponding to the scanning results. © 2013 Springer Science+Business Media Dordrecht.


Peng Z.Y.,Yunnan Normal University | Peng Z.Y.,Chinese Academy of Sciences | Zhao X.H.,Chinese Academy of Sciences | Zhao X.H.,CAS National Astronomical Observatories | And 3 more authors.
Astrophysical Journal | Year: 2012

Previous studies have found that the width of the gamma-ray burst (GRB) pulse is energy dependent and that it decreases as a power-law function with increasing photon energy. In this work we have investigated the relation between the energy dependence of the pulse and the so-called Band spectrum by using a sample including 51well-separated fast rise and exponential decay long-duration GRB pulses observed by BATSE (Burst and Transient Source Experiment on the Compton Gamma Ray Observatory). We first decompose these pulses into rise and decay phases and find that the rise widths and the decay widths also behave as a power-law function with photon energy. Then we investigate statistically the relations between the three power-law indices of the rise, decay, and total width of the pulse (denoted as δr, δd, and δw, respectively) and the three Band spectral parameters, high-energy index (α), low-energy index (β), and peak energy (E p ). It is found that (1) α is strongly correlated with δw and δd but seems uncorrelated with δr; (2) β is weakly correlated with the three power-law indices, and (3) Ep does not show evident correlations with the three power-law indices. We further investigate the origin of δd- α and δw-α. We show that the curvature effect and the intrinsic Band spectrum could naturally lead to the energy dependence of the GRB pulse width and also the δd-α and δw-α correlations. Our results hold so long as the shell emitting gamma rays has a curved surface and the intrinsic spectrum is a Band spectrum or broken power law. The strong δd-α correlation and inapparent correlations between δr and the three Band spectral parameters also suggest that the rise and decay phases of the GRB pulses have different origins. © 2012. The American Astronomical Society. All rights reserved..


Zhou Q.P.,Liupanshui Normal College
Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences | Year: 2010

Ginkgo biloba extract (GBE) is one of the hot spots of drugs extracted from plants recently; it protects brain from ischemia/reperfusion injuries. The mechanism of protective effects includes antioxidation, free radicals clearance, inhibiting the release of excitatory amino acid, anti-inflammation, inhibiting neural apoptosis and other biological effects.


Huang S.,Yunnan Normal University | Yin Y.,Liupanshui Normal College | Peng Z.-Y.,Yunnan Normal University
Astrophysics and Space Science | Year: 2016

GRB100724B was observed by the Gamma-Ray Burst Monitor (GBM) of the Fermi Gamma-Ray Space Telescope. The time-integrated prompt emission spectra of this burst can be best modeled with a combination of non-thermal component (Band) and thermal component (Blackbody). In this paper we compare the fitting results of the two different models (Band Only and Band+Blackbody) in the time-resolved spectra, which implies that (i) the thermal component significantly decrease the low-energy index α and does not seem to affect high-energy index β; the peak energy of νFν spectra Ep increases when BB is added to Band and it leads to faster decay of Ep in decaying episodes. (ii) The traditional synchrotron radiation can not get a better interpretation through the analysis of low-energy index. (iii) This burst can be a good sample of the GRB with hybrid jets, with a thermal component and a cold Poynting flux. © 2016, Springer Science+Business Media Dordrecht.


Ai D.,Liupanshui Normal College | Lu G.,China University of Mining and Technology
Advanced Materials Research | Year: 2012

In order to reduce the coal loss and raise recovery ratio, rotational adjustment mining is used in the last stage of mining No. 31100 work-face for recovering triangle coal. The paper optimized the adjusting mining plan of working face, selected the best adjusting scheme, calculated the cutting cycle numbers and the reasonable length of each section of working face, designed the construction technology process of adjusting mining, calculated the advancing distance when joining each chute, proposed the methods of roof control for head section and areas of the T-junction and leading support in coal roadway.


Gu X.,Guizhou Normal University | Chen R.,King's College London | Tian Y.,Liupanshui Normal College | Li S.,Liupanshui Normal College | Ran J.,Administration Bureau of Maolan National Nature Preservation
Zootaxa | Year: 2012

In this study, we describe a new species of salamander, Paramesotriton maolanensis sp. n., from the Maolan National Nature Reserve, Libo County, Guizhou Province, China. The new species is placed in the genus Paramesotriton based on morphological characteristics and molecular data. It differs from all other members of the genus in a number of morphological characteristics, especially in its much larger body size, absence of granular warts from head and body, largely reduced external eyes and peculiar shape of epibranchia in hyoid apparatus. We examined the relationships of nuclear POMC haplotypes between and within the new species and six recognized species. POMC variation and published mitochondrial data suggested that the new species' closest known relatives are P. longliensis, P. zhijinensis and P. caudopunctatus, and it should be placed into the P. caudopunctatus species group or subgenus Allomesotriton. Copyright © 2012 · Magnolia Press.

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