Zhaotong University

Zhaotong, China

Zhaotong University

Zhaotong, China

Time filter

Source Type

Li X.-P.,Zhaotong University | Luo Y.-H.,Zhaotong University | Zhang L.,Xiamen University | Zhang L.,Zhaotong University | And 3 more authors.
Monthly Notices of the Royal Astronomical Society | Year: 2017

We present the results of simultaneous multiwavelength observations of the blazar PKS 0537- 441 performed with the Rapid Eye Mount telescope (REM) and Swift in the period 2009-2011. During our campaign, PKS 0537-441 showed prominent activity with well-correlated light curves from near-infrared to X-rays in different time epochs. The multiwavelength light curves exhibit several significant flares, in which the 2009 November flare particularly presents a double-peak feature, while the 2010 February flare shows strong optical variability (up to a factor of~5). The REM data show smaller fractional variability amplitudes than the Swift data. There is a general correlation between optical and X-rays, time-lags have been determined with data correlation methods and their uncertainties with Monte Carlo runs, but they are either very uncertain or too long (of the order of 300 d) to be physically relevant. The X-ray spectra exhibit neither absorption nor emission features characteristically. A slight harderwhen- brighter trend in the 2-10 keV energy band is detected. The optical/ultraviolet spectra suggest the presence of thermal emission. We find evidence that the broad-band spectrum is steeper when the degree of variability is larger. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

Li Y.,Kunming University of Science and Technology | Tong X.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Wang J.,Zhaotong University | Zhang Z.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2012

The paper addresses the problem of flexible Workflow Management Systems (WFMS) in distributed environment. Concerning the serious deficiency of flexibility in the current workflow systems, we describe how our FlexFlow workflow system meets the requirements of interoperability, scalability, flexibility, dependability and adaptability. With an additional route engine, the execution path will be adjusted dynamically according to the execution conditions so as to improve the flexibility and dependability of the system. A dynamic register mechanism of domain engines is introduced to improve the scalability and adaptability of the system. We describe functionalities, collaborations and process state diagrams of our system. The system is general purpose and open: it has been designed and implemented as a set of CORBA services. The system serves as an example of the use of middleware technologies to provide a fault-tolerant execution environment for long running distributed applications. The system also provides a mechanism for communication of distributed components in order to support inter-organizational WFMS. © (2012) Trans Tech Publications, Switzerland.

Wang H.R.,Kunming University of Science and Technology | Li Y.,Kunming University of Science and Technology | Wang J.Y.,Zhaotong University | Liao Y.Y.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2013

This work studies the reconstruction of high-speed roll grinder for sculptured surfaces with high feed rates. Experiments and predictions were focused on representative surfaces of dies and molds, whose geometric complexity and complexity distribution were modified parametrically. CNC programs for machining these surfaces were executed in a HERKULES HSF2CNC machining center with a SIEMENS 840D controller, with different levels of programmed feed rate. Discrepancies between programmed and actual feed rates were evaluated. A mechanistic approach for roll grinder in high-speed milling of sculptured surfaces is proposed. The mechanistic model construction is based on: (a) the frequency distribution of linear interpolation path lengths in the CNC program and (b) a characterization of the machine tool for brisk and smooth movements. Two case studies were used to demonstrate the effectiveness of the proposed approach. The reconstruction model is capable of the manufacturing. © (2013) Trans Tech Publications, Switzerland.

Wang H.R.,Kunming University of Science and Technology | Li Y.,Kunming University of Science and Technology | Wang J.Y.,Zhaotong University | Liao Y.Y.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2013

CNC roll grinder, which must be carried out comprehensive analysis in the repair process, is a complex mechanical and electrical integration products. Especially in terms of the mechanical behaviors of the machine tool, performance failure analysis must be carefully. In this paper, the KISC HERKULES grinder analysis of existing fault and improve maintenance. Examples are presented below, for the repair technology. © (2013) Trans Tech Publications, Switzerland.

Wang H.,Kunming University of Science and Technology | Li Y.,Kunming University of Science and Technology | Wang J.,Zhaotong University | Bi G.,Kunming University of Science and Technology | Zhang Z.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2012

In this paper, a design issue related to the multi-agent based industrial intelligent monitor processing system (IIMPS) in distributed substations is proposed. Multiagent-oriented programming might be the new trend of software programming after object-oriented programming. Multagentoriented approach uses a higher-level point of view to see the problems. We comment on the characteristics of industrial monitor problems and claim that the multi-agent system (MAS) is a good choice to solve problems with these characteristics. The proposed multi-agent based IIMPS is able to analyze industrial all real messages to assist human operators in identifying associated events. A prototype MAS with JAVA-based GUI used to integrate the existing SCADA system and as the user interface for operators to perform will be discussed in the paper. © (2012) Trans Tech Publications, Switzerland.

Li Q.,Zhaotong University | Yu P.,Wenzhou University | Luo J.,Zhaotong University | Qian J.,Wenzhou University
Microporous and Mesoporous Materials | Year: 2016

Based on the Bifunctional Method, a new heterometallic cluster-based framework (FJI-7) with the coexistence of Cu4I4 cluster and binuclear [(Dy)2(COO)3(DMF)2], has been successfully synthesized and structurally characterized. This FJI-7 structure exhibits a 3-dimensional framework with Lewis basic pyridinyl sites and magnetic centre simultaneously. Additionally, its sorption behavior and magnetic property are also investigated. © 2016 Elsevier Inc.

Xie S.,Yunnan Normal University | Zhang Z.,Zhaotong University | Yuan L.,Yunnan Normal University
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2014

Chiral metal-organic frameworks (MOFs) have recently received great attention in enantioselective catalysis and chiral separation areas because of their unusual properties such as high surface areas, diverse topologies and excellent chemical and thermal stability. A three-dimensional chiral MOF [Mn3 (HCOO4· (D-Cam)]n with homochiral chain was used as stationary phase for column A (30 m×250 μ m i. d.) and column B (5 m×75 μ m i. d.) in gas chromatography. We investigated the coating properties of stationary phase by scanning electron microscope (SEM) on capillary column inner wall and the thermal stability by thermogravimetric analysis (TGA). Some racemates, alkanes and isomers were used as targets for separation on column B. The experimental results showed that the stationary phase also possessed good separation ability toward these organic compounds.

Ran J.,Zhaotong University | Qi L.-J.,Zhaotong University
Proceedings of the 2012 National Conference on Information Technology and Computer Science, CITCS 2012 | Year: 2012

Aiming at the problem that users often can not retrieve useful information or retrieved information is inaccurate, in this paper we put forward an information retrieval model based on Idiom Literary quotation Ontology. The model and its characteristics were analyzed in detail. Through a systematic in-depth analysis of users' questions, the questions mode and answers mode are proposed, it can improve the efficiency of semantic retrieval, so the precision and recall of semantic retrieval will be better guaranteed. © 2012. The authors - Published by Atlantis Press.

Cai Y.-B.,Yunnan University | Yang H.-T.,Zhaotong University | Li Y.-D.,Yunnan University
Chinese Physics Letters | Year: 2015

Taking into account the effects of shadowing and jet quenching, the large transverse momentum distribution of K+, π+ and K+/π+ ratios at √s originating from resolved photoproduction processes is calculated based on perturbative quantum chromodynamics. It is found that the contribution of K+ and π+ produced by photoproduction processes is evident. The K+/π+ ratios in Au-Au collisions show an obvious enhancement compared with p-p collisions. The numerical results indicate that the photoproduction processes are good modification for kaon and pion production. © 2015 Chinese Physical Society and IOP Publishing Ltd.

Yu G.-M.,Yunnan University | Yang H.-T.,Zhaotong University | Li Y.-D.,Yunnan University
Communications in Theoretical Physics | Year: 2015

We calculate inclusive light vector mesons (ρ, ω, and φ) production in relativistic heavy ion collisions based on the idea of gluon saturation in the color glass condensate (CGC) framework. At high energies, the value of saturation momentum becomes larger than the Quantum Chromodynamics (QCD) confinement scale ΛQCD, which implies that αs(Qs) 蠐 1. Using the relativistic kinetic theory, we derive the production rate for the light vector mesons produced by gluon-gluon fusion in the kT-factorization approach. The numerical results indicate that the light vector mesons from the color glass condensate become prominent in p-p, p-Pb, and Pb-Pb collisions at Large Hadron Collider (LHC) energies. © 2015 Chinese Physical Society and IOP Publishing Ltd.

Loading Zhaotong University collaborators
Loading Zhaotong University collaborators