Shunde Polytechnic

Daliang, China

Shunde Polytechnic

Daliang, China

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Zhong W.-P.,Shunde Polytechnic | Zhong W.-P.,Texas A&M University at Qatar | Belic M.,Texas A&M University at Qatar | Belic M.,University of Belgrade
Annals of Physics | Year: 2015

We present a class of exact solutions to the coupled (2. +. 1)-dimensional nonlinear Schrödinger equation with spatially modulated nonlinearity and a special external potential, which describe the evolution of two-component vector solitons in defocusing Kerr-type media. We find a robust soliton solution, constructed with the help of Whittaker functions. For specific choices of the topological charge, the radial mode number and the modulation depth, the solitons may exist in various forms, such as the half-moon, necklace-ring, and sawtooth vortex-ring patterns. Our results show that the profile of such solitons can be effectively controlled by the topological charge, the radial mode number, and the modulation depth. © 2014 Elsevier Inc.


Zhang Y.,Xi'an Jiaotong University | Liu X.,Xi'an Jiaotong University | Belic M.R.,Texas A&M University at Qatar | Zhong W.,Shunde Polytechnic | Wen F.,Xi'an Jiaotong University
Optics Letters | Year: 2015

We analytically and numerically investigate an anharmonic propagation of two-dimensional beams in a harmonic potential. We pick noncentrosymmetric beams of common interest that carry orbital angular momentum. The examples studied include superposed Bessel-Gauss (BG), Laguerre-Gauss (LG), and circular Airy (CA) beams. For the BG beams, periodic inversion, phase transition, and rotation with periodic angular velocity are demonstrated during propagation. For the LG and CA beams, periodic inversion and variable rotation are still there but not the phase transition. On the whole, the "center of mass" and the orbital angular momentum of a beam exhibit harmonic motion, but the motion of the beam intensity distribution in detail is subject to external and internal torques and forces, causing it to be anharmonic. Our results are applicable to other superpositions of finite circularly asymmetric beams. © 2015 Optical Society of America.


Zhong W.-P.,Shunde Polytechnic | Zhong W.-P.,Texas A&M University at Qatar | Belic M.,Texas A&M University at Qatar | Zhang Y.,Xi'an Jiaotong University
Optics Express | Year: 2015

Nonlinear Schrödinger equation with simple quadratic potential modulated by a spatially-varying diffraction coefficient is investigated theoretically. Second-order rogue wave breather solutions of the model are constructed by using the similarity transformation. A modal quantum number is introduced, useful for classifying and controlling the solutions. From the solutions obtained, the behavior of second order Kuznetsov-Ma breathers (KMBs), Akhmediev breathers (ABs), and Peregrine solitons is analyzed in particular, by selecting different modulation frequencies and quantum modal parameter. We show how to generate interesting second order breathers and related hybrid rogue waves. The emergence of true rogue waves - single giant waves that are generated in the interaction of KMBs, ABs, and Peregrine solitons - is explicitly displayed in our analytical solutions. © 2015 Optical Society of America.


Zhong W.-P.,Shunde Polytechnic | Belic M.,Texas A&M University at Qatar | Zhang Y.,Xi'an Jiaotong University | Huang T.,Texas A&M University at Qatar
Annals of Physics | Year: 2014

A general approach to generating three-dimensional nondiffracting spatiotemporal solutions of the linear Schrödinger equation with an Airy-beam time-dependence is reported. A class of accelerating optical pulses with the structure of Airy-Gauss-Kummer vortex beams is obtained. Our results demonstrate that the optical field contributions to the Airy-Gauss-Kummer accelerating optical wave packets of the cylindrical symmetry can be characterized by the radial and angular mode numbers. © 2013 Elsevier Inc.


Zhong W.-P.,Shunde Polytechnic | Belic M.R.,Texas A&M University at Qatar | Huang T.,Texas A&M University at Qatar
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We investigate the propagation of localized three-dimensional spatiotemporal Airy self-accelerating parabolic-cylinder light bullets in a linear medium. In particular, we consider the effects resulting from utilizing initial finite-energy Airy wave packets to accelerate these localized beams in the absence of any external potential. A general localized light bullet solution with the joint Airy pulse characteristics and parabolic-cylinder spatial characteristics is obtained in the Cartesian coordinates, using parabolic-cylinder and Airy functions. Our results show that the localized wave packets can retain their intensity features and still be accelerated over several Rayleigh lengths. © 2013 American Physical Society.


Zhong W.-P.,Shunde Polytechnic | Zhong W.-P.,Texas A&M University at Qatar | Belic M.R.,Texas A&M University at Qatar
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2010

We report on the nonlinear tunneling effects of spatial solitons of the generalized nonlinear Schrödinger equation with distributed coefficients in an external harmonic potential. By using the homogeneous balance principle and the F-expansion technique we find the spatial bright and dark soliton solutions. We then display tunneling effects of such solutions occurring under special conditions; specifically when the spatial solitons pass unchanged through the potential barriers and wells affected by special choices of the diffraction and/or the nonlinearity coefficients. Our results show that the solitons display tunneling effects not only when passing through the nonlinear potential barriers or wells but also when passing through the diffractive barriers or wells. During tunneling the solitons may also undergo a controllable compression. © 2010 The American Physical Society.


Zhang B.,Shunde Polytechnic
Advanced Materials Research | Year: 2012

In this study, a 14×6JJ a-alloy automobile wheel was used as the object, the fatigue strength and lifetime of the wheel suffered from varying amplitude load were predicted with a cumulative damage theory (the modified Miner theorem), which was considered to be accurate and secure, based on the analysis of load spectrum. The predicted lifetime was verified using a reliability theory. The results showed that, the modified Miner theorem was reliable in the prediction of the lifetime of an automobile a-alloy wheel. © (2012) Trans Tech Publications, Switzerland.


Long J.,Shunde Polytechnic
Advanced Materials Research | Year: 2011

Nano-aluminum, which has high thermal conductivity and good compatibility, was added into paraffin to improve its thermal conductivity. Surface modified technology was adopted and dispersant was used to prepare uniform and stable organic phase-change nano-fluid of paraffin and nano-aluminum. Transient plane source method was used to test the thermal conductivity of the prepared organic phase-change nano-fluid. Results showed that the addition of nano-aluminum largely improved the thermal conductivity of paraffin. After the formula of Lu and Lin was modified, a calculation model for thermal conductivity of the organic phase-change nano-fluid was deduced. And experimental results showed that the results of calculation agreed that of experiment very well. © (2011) Trans Tech Publications, Switzerland.


Bo J.,Shunde Polytechnic
Advances in Intelligent and Soft Computing | Year: 2012

We first introduce the searching mechanism in Gnutella peer-to-peer (P2P) networks, and then analyze the poor scalability in such networks. To improve the search performance of Gnutella networks, we propose a new method which is used to dynamically optimize the network topology. The simulation results show that the policy can effectively reduce the network resources consumption and optimize the load-balance between nodes, and then improve the scalability of Gnutella network and the search efficiency. © 2012 Springer-Verlag GmbH.


Luo Y.,Shunde Polytechnic
International Journal of Security and its Applications | Year: 2015

Information has become the important and strategic resource, and social informatization has become the developing trend and core.The information safety will play an extremely important role in the information society.It is directly relatedto the national security, business and the normal life. Wireless Public Key Infrastrcture(WPKI) is a technology of wireless networks security, which is applied to transform the e-business and the Internet for shopping, banking and transacting with one another in anywhere at anytime by using the wireless devices of mobile phone, PDA, IPAD and so on.Wireless application protocol (WAP) can ensure the secure e-business services and wireless applications.So the structure, principle, security infrastructure, application model and environment of WPKI are described in detail.Then the mobile e-business securitymodel based on WPKI Technology is proposed in this paper.It will analyze and demonstrate how the WPKI technology can provide the security services to mobile E-business with similar security requirements and provide the reader with a high leveltechnical application of the WPKI technology.And a application system provided an excellent example for demonstrating the effectiveness, and the secrecy, identity authentication and non repudiation are studied and analyzed. © 2015 SERSC.

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