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Huijuan T.,Maanshan Teachers College
Proceedings - 9th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2017 | Year: 2017

In this paper, a two-Λ-type five-level system is constructed by using the Zeeman energy level of the lithium atom's hyperfine structure and interacting with two optical fields which have different polarization directions. The quantum coherence effect of the system is studied under the condition of two photon resonance. Firstly, we construct the Hamiltonian of the system under the rotation frame, and get the dark state of the system by solving the eigenvalues and eigenstates of the Hamiltonian. Then, a new coupled representation is constructed by the dark state, and the preparation of the dark state of the five-level system is further studied. Finally, the density matrix motion equations of the five-level system are established, and the numerical solution is solved by program. Through numerical simulation, we give the curve of the signal light absorption intensity with its changed detuning, and from this curve. We can see that there is a transparent window near the zero of the signal light detuning, accompanied by a normal dispersion curve. The position of the transparent window corresponds to the dark state condition for the formation of the system, that is, the system is prepared to the dark state under the two-photon resonance condition, and the atoms in the dark state do not interact with the light field, so the incident signal light appears transparent. © 2017 IEEE.


Li S.,Maanshan Vocational Technical College | Li Y.,Maanshan Teachers College
Lecture Notes in Electrical Engineering | Year: 2013

In computer network system, the diameter always be represented the worst delay in the communication between any two nodes, it is an important factor to measure transmission efficiency, and the average diameter is the average delay between any two nodes, can it be measured transmission efficiency? The minimum distance diagram of a directed double-loop network is always an L-shaped tile, which can be described with four geometric parameters: a, b, p and q. According to the L-shaped tile, we proved that the average diameter of directed double-loop network was also up to four geometric parameters: a, b, p and q, we provided two algorithms to compute them, and simulated the relationship between average diameter and diameter. Simulation indicates that the distribution of the diameter and the average diameter are all axis-symmetrical figure; the average diameter approaches to a half of the diameter at the same point; the diameter does not always obtain minimum value, when the average diameter obtains minimum value. Finally, we verified that the lower bounds about the diameter and the average diameter of the directed double-loop networks provided by Wong and Coppersmith were correct, and confirmed Fang et al.'s suspicions. So we get that the average diameter also can be measured transmission efficiency in computer network system. © 2013 Springer-Verlag.


Tang D.,Maanshan Teachers College | Xu L.,Anhui Polytechnic University
BioTechnology: An Indian Journal | Year: 2014

To study about the key of free kick direct score, this paper will find out the movement trail of the swirling free kick based on the models of physics and probability statistics. Through consider we get the conclusion that there will be a lot of factors that affect the goalkeeper and the shooter: ball speed, rotation, the man wall, the way the ball get through the man wall, the goalkeeper's psychological state, the way the goalkeeper saves, difficulty of shooting, goalkeeper's physical condition and experience, shooter's power, the deviation of the real trail and his accuracy, and the theoretical trail. After analyzing the scope that the goalkeeper can reach in some time, we can get a constraint equation of score. And by considering the instability of goalkeeper, the probability he can save a ball and the difficulty of shooting with other factors, we will finally get the best strategy. © Trade Science Inc.


Chen Y.,Anhui University of Technology | Li Y.,MaAnshan Teachers College | Wang J.,Anhui University of Technology
Journal of Network and Computer Applications | Year: 2011

In parallel transmission system, the wide diameter has become an important factor to measure transmission efficiency instead of the diameter. The minimum distance diagram of a directed double-loop network yields an L-shaped tile, an L-shaped tile can be described by four geometric parameters: a, b, p and q, let m=ap, n=b-q, the L-shaped tiles can be classified into 4 types according to the value of m and n. In this paper, through classification and superposition to L-shaped tiles, we give a method to search the equivalent node, and provide the formulas for the wide diameter of directed double-loop networks. We also prove that for any directed double-loop networks, the lower and the upper bounds of the wide diameter are ceil (sqrt(3×N))-1 and N-1, respectively. Next, we use simulation results to demonstrate the relationship between the wide diameter and tight optimal directed double-loop networks. It is obvious that the wide diameter doesn't always obtain minimum value in tight optimal directed double-loop networks, but the directed double-loop network must be tight optimal one when its wide diameter obtains minimum value. The simulation results indicate that there are many double tight optimal directed double-loop networks. © 2010 Elsevier Ltd. All rights reserved.


Wu Y.,Anhui Normal University | Wu Y.,Maanshan Teachers College | Ni Y.,Anhui Normal University
Chemical Engineering Journal | Year: 2012

In this paper, Se nanostructures have been successfully synthesized via a rapid wet chemical reduction route in the presence of potassium sorbate, a food surfactant, employing SeO 2 and KBH 4 as the starting reactants at 50°C for 30min. Some factors influencing the morphology of Se nanostructures such as the amounts and sorts of surfactants, the reaction temperature and the reaction time were investigated. The as-obtained Se nanostructures were characterized by X-ray powder diffractometer (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR/TEM). A possible formation process of Se nanostructures was discussed based on the experimental results. © 2012 Elsevier B.V.


Li Y.,Maanshan Teachers College | Chen Y.B.,Anhui University of Technology | Chen T.,Anhui University of Technology
Applied Mechanics and Materials | Year: 2013

Used equivalent tree to construct the minimum distance diagram of triple loop networks and found the relationships between the layer of the equivalent tree and the shortest path of any two points in triple loop networks, and provided a formula to compute its average diameter. The experimental results show that average diameter approaches to a half of the diameter at the same network, in one infinite family, the diameter must obtain minimum value when average diameter obtains the minimum value, but the inverse is not. Studies also show that average diameter is the better parameter to measure transmission efficiency about loop networks instead of diameter. © (2013) Trans Tech Publications, Switzerland.


Chen Y.,Anhui University of Technology | Li Y.,Maanshan Teachers College | Tai W.,Anhui University of Technology | Zheng X.,Anhui University of Technology
Proceedings - 2014 2nd International Conference on Advanced Cloud and Big Data, CBD 2014 | Year: 2014

To solve the performance bottleneck of tree-based structure and single point failure issues of data center networks, this thesis proposes an undirected double-loop data center network structure, which makes use of the cyclic graph's excellent properties on the node number and path length to achieve high performance, good scalability and fault-tolerance. Main issues include the method to build the minimum distance diagram of undirected double-loop networks, the algorithm to calculate its diameter, and the step to build optimal undirected double-loop networks, etc. We prove that the diameter of the undirected double-loop network is equal to the height of its tree structure, and propose a rapid algorithm to calculate the diameter, and find that there are lots of optimal undirected double-loop networks in some infinite clusters. Finally, the lower bound proposed by Yebra is verified by experiment. According to these results above, the transmission performance of undirected double-loop data center networks will be optimized. © 2014 IEEE.


Chen Y.,Anhui University of Technology | Wang J.,Anhui University of Technology | Li Y.,Maanshan Teachers College
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2010

A new concept of the fault-tolerant routing and the fault-tolerant diameter of directed double-loop networks G(N;r, s) was introduced. The distribution of the optimal equal nodes which the fault-tolerant nodes correspond with was studied by using the overlapping principle of L-shape tile. The formula represented by four parameters a, b, p, q of the L-shape tile determined by the network G(N; r, s) for the fault-tolerant diameter and the algorithm for fault-tolerant routing of the networks were given. According to this fault-tolerant routing algorithm, the reliability and the message delay of networks will be optimal, when some faults occur in it.


Chen Y.-B.,Anhui University of Technology | Li Y.,Maanshan Teachers College | Zheng X.,Anhui University of Technology | Chen T.,Anhui University of Technology
Tongxin Xuebao/Journal on Communications | Year: 2013

The formula of average diameter about directed double-loop networks was presented according to the relationship between average diameter and four geometric parameters (a, b, p and q) of its minimum distance diagram (L-shaped tile), and a rapid algorithm to compute the average diameter was presented. A novel method to construct the minimum distance diagram (equivalent tree) of triple loop networks was presented, and the relationships between the layer of the equivalent tree and the shortest path of any two points in triple loop networks was studied, and a formula and a algorithm to compute its average diameter was provided. The experimental results show that average diameter approaches to a half of the diameter at the same network, in one infinite family, the diameter must obtain minimum value when average diameter obtains minimum value, but the inverse is not. Studies show that average diameter is the better parameter to measure transmission efficiency about loop networks instead of diameter, so average diameter should become one of important bases to design the optimal networks.


Chen Y.,Anhui University of Technology | Li Y.,MaAnshan Teachers College | Chen T.,Anhui University of Technology
Theoretical Computer Science | Year: 2013

This paper addresses the reliability of directed double-loop networks G(N;r,s), and studies the problems about optimal fault-tolerant routing, fault-tolerant diameter, etc., in G(N;r,s). Firstly, we study the shapes of the L-shaped tiles which are the minimum distance diagram of directed double-loop networks; we divide them into four types. There are different parameters for each type. According to the solutions to the congruence equation, then we study the distributions of the optimal equivalent nodes for different destination nodes, and present an optimal fault-tolerant routing algorithm and a formula computing the fault-tolerant diameter. Finally, we prove that there is a lower bound for fault-tolerant diameter, and show that there may be lots of double optimal directed double-loop networks in some infinite clusters of G(N;r,s). According to the proposed fault-tolerant routing algorithm, the reliability and transmission performance will be optimal when some faults occur in G(N;r,s). © 2012 Elsevier B.V. All rights reserved.

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