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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. Source

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. Source

Chen Y.-B.,Anhui University of Technology | Li Y.,Maanshan Teachers College | Li Z.-K.,Anhui University of Technology
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2011

An improved algorithm about L-shaped tile of double-loop networks G(N;r,s) was proposed at first, by which four parameters of L-shaped tile could be quickly obtained without creating its L-shaped tile, and the diameter could be computed easily. Then, the distribution rule of the optimal step was found by researching on the relationship between the step and the amount of nodes. The double-loop networks could obtain an optimal diameter when the range of the steps might be an interval, furthermore the difference between the diameter and its low limit was given. Finally, comparison and analysis were made in terms of simulation results of three algorithm. Source

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. Source

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. Source

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