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Search Results: 1 - 10 of 78238 matches for " Zhongkai Chen "
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Engineering-Oriented Practical Training Methodology for Undergraduate and a Case Study
Jianyong Zuo,Zhongkai Chen
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: In this study, the education method which is different from traditional Chinese education methods for its accentuation of practical training is proposed. Compared with traditional engineering education methods, engineering-oriented practical training methodology is student-centered, contains various educational activities, requires interdisciplinary skills, values teamwork and have more objective evaluation methods. Based on the educational case of anti-skid control of railway train, a semi-physical simulation platform is introduced with details in design philosophy, system structure, operator interface and training process. The intention of creating the platform is to provide the students who use it with more hands-on experience since one of the key factors in transfer of learning is the diversion of practice. Based on the knowledge transfer theory, we encourage our students to do their work more independently and freely and the corresponding scores of their performance prove that the students who are better-rounded tend to perform well in the training courses we offered while those only with straight a scores may not outperform their classmates. Thus, the results indicate that this mode is effective in education and instructive to the reform of technological college education.
The Financial Capacity Assessment of Major Grain Producing Areas—Empirical Analysis Based on Shandong Country Data  [PDF]
Zhongkai Liu
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.311025
Abstract: In this paper, starting at the definition of government financial capacity, building financial capacity evaluation system through factor analysis, and given that the fiscal capacity is unbalanced not only between grain producing areas and non-grain producing areas, but also among grain producing areas. Grain producing areas’ economic development level influences financial capacity. Non-grain producing areas’ supply of public goods does not match with economic development level. Then, some suggestions are submitted.
Manipulating the momentum state of a condensate by sequences of standing wave pulses
Wei Xiong,Xuguang Yue,Zhongkai Wang,Xiaoji Zhou,Xuzong Chen
Physics , 2011, DOI: 10.1103/PhysRevA.84.043616
Abstract: We analyze the effects of sequences of standing wave pulses on a Bose-Einstein condensate (BEC). Experimental observations are in good agreement with a numerical simulation based on the band structure theory in the optical lattice. We also demonstrate that a coherent control method based on such sequences of pulses is very efficient for experimentally designing specific momentum states.
Invariant foliations for stochastic partial differential equations with dynamic boundary conditions
Zhongkai Guo
Mathematics , 2013,
Abstract: Invariant foliations are complicated random sets useful for describing and understanding the qualitative behaviors of nonlinear dynamical systems. We will consider invariant foliations for stochastic partial differential equation with dynamical boundary condition.
The observation of diffraction phases in matter wave scattering
Xuguang Yue,Yueyang Zhai,Zhongkai Wang,Hongwei Xiong,Xuzong Chen,Xiaoji Zhou
Physics , 2013, DOI: 10.1103/PhysRevA.88.013603
Abstract: We study the diffraction phase of different orders via the Dyson expansion series, for ultracold atomic gases scattered by a standing-wave pulse. As these diffraction phases are not observable in a single pulse scattering process, a temporal Talbot-Lau interferometer consisting of two standing-wave pulses is demonstrated experimentally with a Bose-Einstein condensate to explore this physical effect. The role of the diffraction phases is clearly shown by the second standing-wave pulse in the relative population of different momentum states. Our experiments demonstrate obvious effects beyond the Raman-Nath method, while agree well with our theory by including the diffraction phases. In particular, the observed asymmetry in the dependence of the relative population on the interval between two standing-wave pulses reflects the diffraction phase differences. The role of interatomic interaction in the Talbot-Lau interferometer is also discussed.
Asymmetric superradiant scattering and abnormal mode amplification induced by atomic density distortion
Zhongkai Wang,Linxiao Niu,Peng Zhang,Mingxuan Wen,Zhen Fang,Xuzong Chen,Xiaoji Zhou
Physics , 2013,
Abstract: The superradiant Rayleigh scattering using a pump laser incident along the short axis of a Bose-Einstein condensate with a density distortion is studied, where the distortion is formed by shocking the condensate utilizing the residual magnetic force after the switching-off of the trapping potential. We find that very small variation of the atomic density distribution would induce remarkable asymmetrically populated scattering modes by the matter-wave superradiance with long time pulse. The optical field in the diluter region of the atomic cloud is more greatly amplified, which is not an ordinary mode amplification with the previous cognition. Our numerical simulations with the density envelop distortion are consistent with the experimental results. This supplies a useful method to reflect the geometric symmetries of the atomic density profile by the superradiance scattering.
Observation of Superposition of Distinct Quantum Dynamical Oscillations with Ultracold Bose Gases
Zhongkai Wang,Baoguo Yang,Dong Hu,Xuzong Chen,Hongwei Xiong,Biao Wu,Xiaoji Zhou
Physics , 2015,
Abstract: We observe experimentally a superposition of two distinct quantum dynamical oscillations with a Bose-Einstein condensate (BEC) in optical lattice. The BEC is loaded in high bands. By controlling the Bragg reflections at the Brillouin zone edge, we can switch the quantum dynamics from Bloch-Zener oscillations across both F and D bands to Bloch oscillations only within F-band. At the intermediate strength, we are able to observe a macroscopic superposition of these two different quantum oscillations in the momentum space. These oscillations are rather exceptional as they can last up to 60ms and one part of the BEC can move up to 200?m in space during the oscillations.
Inversion Formulas for the Spherical Radon-Dunkl Transform
Zhongkai Li,Futao Song
Symmetry, Integrability and Geometry : Methods and Applications , 2009,
Abstract: The spherical Radon-Dunkl transform R_κ, associated to weight functions invariant under a finite reflection group, is introduced, and some elementary properties are obtained in terms of h-harmonics. Several inversion formulas of R_κ are given with the aid of spherical Riesz-Dunkl potentials, the Dunkl operators, and some appropriate wavelet transforms.
Inversion Formulas for the Spherical Radon-Dunkl Transform
Zhongkai Li,Futao Song
Mathematics , 2009, DOI: 10.3842/SIGMA.2009.025
Abstract: The spherical Radon-Dunkl transform $R_\kappa$, associated to weight functions invariant under a finite reflection group, is introduced, and some elementary properties are obtained in terms of $h$-harmonics. Several inversion formulas of $R_\kappa$ are given with the aid of spherical Riesz-Dunkl potentials, the Dunkl operators, and some appropriate wavelet transforms.
Algorithms for finding transposons in gene sequences
Yue Wang,Zhongkai Zhao
Computer Science , 2015,
Abstract: With the process of evolution, some genes will change their relative positions in gene sequence. These "jumping genes" are called transposons. Through some intuitive rules, we give a criterion to determine transposons among gene sequences of different individuals of the same species. Then we turn this problem into graph theory and give algorithms for different situations with acceptable time complexities. One of these algorithms has been reported briefly as the "iteration algorithm" in Kang et al.'s paper (in this paper, transposon is called "core-gene-defined genome organizational framework", cGOF). This paper provides the omitted details and discussions on general cases.
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