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Derivative Form of Off-axis Aberration Correction Surface and Its Application in Solar Energy Concentration

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Communications in Theoretical Physics 2009年第2期51卷 315-320页

作者： LI Li chen ying-tian HU Sen Joint Advanced Research Center in Suzhou University of Science and Technology of China and City University of Hong Kong Suzhou 215123 China Suzhou Institute for Advanced Study University of Science and Technology of China Suzhou 215123 China Department of Astronomy and Applied Physics University of Science and Technology of China Heifei 230026 China Department of Mathematics University of Science and Technology of China Hefei 230026 China

By using the derivative method, we obtained the same result with that of the previous work of chen et al. in 2006. Different from the integral form, the derivative form of the surface expression published in this paper is derived from differential equation and based on the theory of non-imaging focusing heliostat proposed by chen et al. in 2001. The comparison of the derivative form of fixed aberration correction surface has been made with that of integral form surface as well as that of spherical surface in concentrating the solar ray.

关键词： off-axis aberration correction canting continuous surface asymmetric curvature

Sleeping of a Complex Brain Networks with Hierarchical Organization

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Communications in Theoretical Physics 2009年第1期51卷 97-100页

作者： ZHANG ying-Yue YANG Qiu-ying chen tian-Lun Department of Physics Nankai University Tianjin 300071 China

The dynamical behavior in the cortical brain network of macaque is studied by modeling each cortical area with a subnetwork of interacting excitable neurons. We characterize the system by studying how to perform the transition, which is now topology-dependent, from the active state to that with no activity. This could be a naive model for the wakening and sleeping of a brain-like system, i.e., a multi-component system with two different dynamical behavior.

关键词： self-organized criticality hierarchical organization EEG-like wave cortical network sleeping

Self-organized Critical Model Based on Complex Brain Networks with Hierarchical Organization

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Communications in Theoretical Physics 2008年第9期50卷 681-684页

作者： ZHANG ying-Yue ZHANG Gui-Qing YANG Qiu-ying chen tian-Lun Department of Physics Nankai University Tianjin 300071 China

The dynamical behavior in the cortical brain network of macaque is studied by modelling each cortical areawith a subnetwork of interacting excitable *** find that the avalanche of our model on different levels *** the... 详细信息

关键词： self-organized criticality hierarchical organization power-law cortical network refractory-period

Complete Solution of Sun Tracking for Heliostat

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Communications in Theoretical Physics 2006年第1期45卷 165-166页

作者： chen ying-tian LIM Boon-Han LIM Chern-Sing Department of Astronomy and Applied Physics University of Science and Technology of China Hefei 230026 China

A general solution of sun tracking for an arbitrarily oriented heliostat towards an arbitrarily located target on the earth is published. With the most general form of solar tracking formulae, it is seen that the used azimuthelevation, spinning-elevation tracking formulae etc. are the special cases of it. The possibilities of utilizing the general solution and its significance in solar energy engineering are discussed.

关键词： solar tracking azimuth-elevation spinning-elevation optical aberration heliostat

Effects of Vertex Activity and Self-organized Criticality Behavior on a Weighted Evolving Network

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Communications in Theoretical Physics 2008年第8期50卷 421-424页

作者： ZHANG Gui-Qing YANG Qiu-ying chen tian-Lun Department of Physics Nankai University Tianjin 300071 China

Effects of vertex activity have been analyzed on a weighted evolving *** network is characterized by the probability distribution of vertex strength,each edge weight and evolution of the strength of vertices with different vertex *** model exhibits self-organized criticality *** probability distribution of avalanche size for different network sizes is also *** addition,there is a power law relation between the size and the duration of an avalanche and the average of avalanche size has been studied for different vertex activities.

关键词： weighted evolving network vertex activity power-law self-organized criticality

Nonlinear Dynamical Behavior in BS Evolution Model Based on Small-World Network Added with Nonlinear Preference

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Communications in Theoretical Physics 2007年第7期48卷 137-142页

作者： ZHANG ying-Yue YANG Qiu-ying chen tian-Lun Department of Physics,Nankai University,tianjin 300071,China Department of Physics Nankai University Tianjin 300071 China

We introduce a modified small-world network adding new links with nonlinearly preferential connectioninstead of adding randomly,then we apply Bak-Sneppen(BS)evolution model on this *** study severalimportant structural properties of our network such as the distribution of link-degree,the maximum link-degree,and thegth of the shortest *** further argue several dynamical characteristics of the model such as the important criticalvalue f_c,the f_0 avalanche,and the mutating condition,and find that those characteristics show panticular behaviors.

关键词： power-law behavior small-world network evolution model nonlinear preference

Realization of Tip Tilting By 8-Step Line Tilting

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Communications in Theoretical Physics 2009年第9期52卷 549-554页

作者： chen ying-tian ZHANG Yang HU Sen HO Tso-Hsiu Boon Ham Lim chen Sin Lim Department of Astronomy and Applied Physics University of Science and Technology of Cbina Hefei 230026 China Department of Mathematics University of Science and Technology of China Hefei 230026 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

By direct calculation of rotation matrices of SO(3),we show how certain specific sequence of eight consecutiverotations of digital angles can yield a tilting of a facet *** also design a detailed program specifically to tiltan array of mirrors from planar orientation to the required focusing *** describe how to use the 8-step torealize the focusing of the mirror *** have found,in our designed program,an important feature of row-sharingduring the rotations for the columns and similarly the column-sharing during the rotations for the *** feature cansave a lot of operating time during the actual realization of the mechanical movements.

关键词： rotational group solar energy optical device tip tilting line tilting

Dynamics of Microbial Activity Related to N Cycling in Cd-Contaminated Soil During Growth of Soybean

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Pedosphere 2007年第3期17卷 383-388页

作者： YANG Ye chen ying-Xu tian Guang-Ming ZHANG Zi-Jian Department of Environmental Engineering Zhejiang University Hangzhou 310029 （China） Appraisal Center for Environment and Engineering SEP Beijing 100012 （China）

The potential influences of cadmium (Cd) on the biochemical processes of the soil nitrogen (N) cycle, along with the dynamics of ammonification, nitrification, and denitrification processes in the rhizosphere and non-rhizosphere (bulk soil), respectively, were investigated in a Cd-stressed system during an entire soybean growing season. In terms of Cd pollution at the seedling stage, the ammonifying bacteria proved to be the most sensitive microorganisms, whereas the effects of Cd on denitrification were not obvious. Following the growth of soybeans, the influences of Cd on ammonification in the bulk soil were: toxic impacts at the seedling stage, stimulatory effects during the early flowering stage, and adaptation to the pollutant during the podding and ripening stages. Although nitrification and denitrification in the bulk soil decreased throughout the entire growth cycle, positive adaptation to Cd stress was observed during the ripening stage. Moreover, during the ripening stage, denitrification in the bulk soil under high Cd treatment (20 mg kg-1) was even higher than that in the control, indicating a probable change in the ecology of the denitrifying microbes in the Cd-stressed system. Changes in the activity of microbes in the rhizosphere following plant growth were similar to those in the non-rhizosphere in Cd treatments; however, the tendency of change in the rhizosphere seemed to be more moderate. This suggested that there was some mitigation of Cd stress in the rhizosphere.

关键词： cadmium microbial activity nitrogen cycle rhizosphere

Digitalized Mirror Array and Its Application in Large Telescope:Principle and Case Studies

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Communications in Theoretical Physics 2009年第10期52卷 750-760页

作者： chen ying-tian ZHANG Yang HU Sen Ho Tso-Hsiu Boon Ham Lim chen Sin Lim Kok Keong Chong Boon Kok Tan University of Science and Technology of China Department of Astronomy and Applied Physics Hefei 230026 China University of Science and Technology of China Department of Mathematics Hefei 230026 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China University of Tunku Abdul Rahman Faculty of Engineering and Science Selangor Malaysia

In this article, we report the principle and conceptual design of a fundamentally different technology in fabricating high precision aberration free optical devices. The tip-tilt of facet in a mirror array is produced by digitally controlled line-tilts of rows and columns. It has not only provided a cost-effective designing methodology in optical physics but also led to a much finer precision of 1 mili arc sec or less. As examples of the application of the proposed digitalised optics, two case studies have been given： a 10 m Schmidt telescope （off-axis） and an 8 m Cassegrain telescope （on-axis）.

关键词： tip-tilting line-tilting Schmidt telescope aberration correction cassegrain telescope