Xiaogan University

Xiaogan, China

Xiaogan University

Xiaogan, China
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Zhang X.,Central China Normal University | Zhang X.,Xiaogan University | Hu X.,Central China Normal University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2010

We explore the quantum entanglement between two collective fields via atomic coherence effects. For three-level atoms in V configuration driven by two applied fields on two-photon resonance, one coherent superposition of the excited states is not excited, which is the counterpart of coherent population trapping. The coherence-induced depopulation makes two cavity fields in each collection combine into a quantum-beat, i.e., equivalently, the difference mode of the two components decouples from the driven atoms. The two sum modes, when they are arranged in the four-wave mixinglike interactions, can be prepared in Einstein-Podolsky-Rosen entangled state. Correspondingly, any two individual fields from different collective modes are entangled with each other. Furthermore, the effects of thermal reservoir and laser linewidths are discussed, and a generalization is given to the case in which each quantum beat involves more than two modes. © 2010 The American Physical Society.

Ma Z.,Inner Mongolia University of Science and Technology | Yang S.,Baotou Service and Management Vocational School | Xiong Z.,Xiaogan University
Journal of Convergence Information Technology | Year: 2012

An intrusion detection system (IDS) is a new safeguard technology for network system security after traditional technologies, such as access control, firewall and message encryption. The IDS can look for the evidence in the Hosts or the networks to detect some latent threat, and gives passive alerts to the administrators or takes active measures without intervening. However, the IDS has drawbacks in many aspects, among of which the two outstanding problems are the high ratio of false alarms and the lack of self-adaptation. Inspired by the powerful information processing capabilities of the biological immune system (BIS), a novel multi-level active security defense mechanism for computer systems is proposed and described. This mechanism can perform real-time monitoring, detecting and responding in accordance with the needs and preferences of system administrators. In addition, this mechanism utilizes a distributed and multi-hierarchy framework to provide an effective solution for the network intrusion detection. The experimental results show that this mechanism is a good solution for network security evaluation. It can improve effectively the performance of traditional IDSs, especially in the heterogeneous networks and the large-scale high-speed network system. This on-going research effort is to develop a more self-adaptive system that will perform real-time monitoring, analyzing, and generating appropriate response to wide variety of intrusive activities.

Wang J.,Nankai University | Zhou R.,Nankai University | He Z.-R.,Xiaogan University | He Z.,Nankai University
European Journal of Organic Chemistry | Year: 2012

Convenient and highly efficient syntheses of tetrasubstituted furans with flexible substituent patterns from simple and readily available starting materials have been developed. Under very mild conditions, with the mediation of stoichiometric nBu 3P, simple terminal activated olefins and acyl chlorides or anhydrides smoothly furnish tetrasubstituted furans in modest to excellent yields. This synthetic strategy features a flexible selection of substituent pattern and a C-acylation/O-acylation/C-acylation/intramolecular Wittig reaction multiple domino assembly sequence. Simplicity can give rise to flexibility and efficiency. Convenient and highly efficient syntheses of tetrasubstituted furans from simple terminal activated olefins through phosphane-mediated multiple domino assembly sequences (such as C-acylation/O-acylation/C-acylation/intramolecular Wittig reaction) have been achieved. © 2012 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Cao G.,Xiaogan University
Lecture Notes in Electrical Engineering | Year: 2013

This paper is concerned with strategies on how to deal with errors in Oral Practice. It is conducted by a small scale investigation into students' feedbacks towards teachers' actions and attitudes. Discussion is based on existing researches in this field and the writer's seven-year professional teaching experience. The results of analysis proved that teachers' response to students' errors does influence language learning behaviors. Based on the results, implications for foreign language teaching are suggested. © 2013 Springer-Verlag.

Zhang Q.,Henan University of Technology | Xiong Z.,Xiaogan University | Liu G.,Henan University of Technology
International Journal of Digital Content Technology and its Applications | Year: 2011

To the noise in the vibration information of long-distance distributed optical fiber-sensing system, discrete wavelet transform was adopted to eliminate. On the basis of analyzing noise eliminating theory, wavelet shrinkage method was proposed and a few kinds of threshold selection rules were discussed. The processing results of different noise eliminating techniques to vibration signal and its energy distribution in frequency domain were simulated and analyzed. The results show that discrete wavelet transform has the same excellent performance with stationary wavelet transform in noise eliminating to vibration signal.

Xiong Z.-G.,Xiaogan University | Xiong Z.-G.,University of Science and Technology Beijing | Zhai Z.-L.,University of Science and Technology Beijing | Zhang X.-M.,Xiaogan University | Xia X.-W.,Xiaogan University
International Journal of Digital Content Technology and its Applications | Year: 2011

This paper presents a model of grid workflow service composition based on colored Petri net that can represent complex session protocols and the component service composition, using token of color of colored Petri net to simulate the different events and message types of business processes. The service session agreement and the grid workflow service composition are converted to colored Petri net, which can make use of the specialized tools of existing Petri net to analyze and verify system performance and behavior properties, thereby enhancing the reliability of the grid workflow service composition.

Li W.,Wuhan University | Xiao L.,Wuhan University | Qin C.,Xiaogan University
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry | Year: 2011

A novel modifying process was designed to prepare ultra small magnetic chitosan nanoparticles which exhibited unique thermal stability and decomposition mechanism. The chemical structures and physical properties of the prepared products were characterized using FTIR, TEM, XRD, TGA and DSC techniques. The results revealed that this approach eliminated the aggregation among nanoparticles. The magnetic chitosan particles were 10-15 nm in size with good dispersibility and new thermal property. To further study the decomposition process, the combined TGA-FTIR technique was used to the analysis of the evolution with the temperature of the gas products evolved in the degradation of the magnetic chitosan. The phenomena were observed directly from TGA-FTIR stack plots. From the measurements data, it suggested that the unusual thermal behavior of chitosan might be attributed to the additional bridging through metal oxide. Copyright © Taylor & Francis Group, LLC.

Xiong Z.-G.,Xiaogan University | Zhang X.-M.,Xiaogan University
2010 The 2nd International Conference on Computer and Automation Engineering, ICCAE 2010 | Year: 2010

Although the theory of distributed firewall was proposed shortly, but because of its advantages relative to traditional firewall, business user oriented characteristics, it could meet customer demand for higher security. This paper proposed a firewall program suitable for network security in accordance with small and medium enterprise network security situation, systematically analyzed the distributed firewall policy management and policy actuator functions, features and related technologies, to discuss the overall design and structure of the log server module. ©2010 IEEE.

Zhang X.,Xiaogan University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

We shown that it is possible to produce a entangled one-atom dressed-state laser via atomic coherence effcets. For a V-type three-level atom embedded in a two-mode cavity, two applied fields induce a quantum-beat and the collective field comes into interaction. The stastics of the collective field is sub-Poissonian in the good cavity condition. The collective field intensity quantum noise reducetion produces the entanglement between two cavity fields. © 2012 SPIE.

Sun C.-F.,Xiaogan University
Wuli Xuebao/Acta Physica Sinica | Year: 2012

Using equivalent transformation and spin-rescaling methods, the Gauss model on a decorated square lattice is studied. It is found that the square decorated Gauss lattice could be transformed into a regular square Gauss lattice with nearest-neighbor, and next-nearest-neighbor interactions. By calculating the regular square-lattice Gauss model, the critical temperature of the Gauss model is obtained on a decorated square lattice, and the exact phase diagram of this system can also be obtained. © 2012 Chinese Physical Society.

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