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Meng B.,Hunan University | Meng B.,Anshun College | Wang L.-L.,Hunan University | Huang W.-Q.,Hunan University | And 3 more authors.
Applied Optics | Year: 2012

We present a procedure to generate slow light with a large group index, wideband, and low dispersion in our suggested photonic crystal waveguide. By modulation of the declinations in the first two rows of air holes, the group index, the bandwidth, and the dispersion can be tuned effectively. Utilizing the two-dimensional plane wave expansion method (PWE) and the finite-difference time-domain method (FDTD), we demonstrate slow light with the group indices of 23, 35, and 45, respectively, while restricting the group-index variation within a 10% range.We accordingly attain an available bandwidth of 40.7, 23.7, and 5.1 nm, respectively. Meanwhile, the normalized delay-bandwidth product stays around 0.45, with minimal dispersion less than 0.2 (ps2 /m) for all the cases. © 2012 Optical Society of America.


Zhang S.-J.,Anshun College | Xu C.-H.,Tsinghua University | Chen J.-B.,Tsinghua University | Zhou Q.,Tsinghua University | Sun S.-Q.,Tsinghua University
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2011

Fourier transform infrared (FTIR) spectroscopy and second derivative IR spectroscopy were applied to analyze and evaluate different parts of Scorpio. The second derivative IR spectra show clear differences while the origin spectra are quite similar. It was found that proteins are the dominant components in each part and the tail has distinct proteins compared to the others; fats are mainly stored in the trunk; sulfates are ubiquitous in all parts. Interestingly, the back part of the trunk of degenerative Scorpio contains some purine. It was demonstrated that FTIR spectroscopy integrated with second derivative IR spectroscopy not only can offer a fast, comprehensive and objective methodology for analyzing and evaluating the micro-differences among the various parts of same medicinal materials, but also can provide a rational guidance for medicinal and pharmacological studies.


Zhang X.,Anshun College | Zhang S.,Anhui University | Liu H.,Anshun College
Chemistry Bulletin / Huaxue Tongbao | Year: 2012

In the presence of the CTAB soft template, AgBr/CeO2 nanocomposites were prepared by coprecipitation method. The products were characterized by TEM, XRD, XPS and UV-Vis spectra. The photocatalytic activity of the AgBr/CeO2 nanocomposites was studied by the photo-degradation of methyl orange. In addition, the effect factors, such as reaction time, solution acidity, amounts of H2O2 and the catalyst as well as repeat use of the catalyst, were discussed in detail.


Zhang Y.,Southwest University | Zhang Y.,Anshun College | Chen X.,Southwest University | Yang Y.,Southwest University | And 3 more authors.
Journal of Environmental Sciences | Year: 2011

Dissolved organic matter (DOM) plays an important role in the process of mercury release from water body. In this study, the influence of DOM from different sources (DOM R, DOM S and DOM H, extracted from rice straw, compost and humic soil respectively) on mercury reduction was investigated. The molecular weight distribution and chemical composition of DOM from each source were determined using ultrafiltration membrane technique and elemental analysis respectively. The result showed that mercury release from DOM-added samples was much lower than the control; the lowest mercury release flux was observed in the treatment of DOM H, 25.02% of the control, followed by DOM S and DOM R, 62.46% and 64.95% of the control, respectively. The higher saturation degree and lower molecular weight of DOM H was responsible for the highest inhibition degree on the mercury release. The link between DOM H, concentration and mercury flux was also estimated and the result showed that mercury flux was increased with DOM H at lower concentration, while decreased with DOM H at higher concentration. Different mechanism dominated the influence of DOM on mercury release with variation of DOM concentration. © 2011 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.


Qian S.-Q.,Anshun College | Wu H.-H.,Anshun College
2013 IEEE Conference Anthology, ANTHOLOGY 2013 | Year: 2014

In this paper, a dynamic immune optimization algorithm with constraints (DCIOA), based on adaptive memory and dynamic recognition functions of artificial systems, was proposed to deal with Knapsack problem with constraints in dynamic environments. A novel dynamic stochastic ranking strategies is used to select excellence antibodies, meanwhile, infeasible antibodies participate in evolution of population; Improving the searching functions utilizes repairing method to remedy infeasible antibodies, and make sure the rate of feasible antibody in current environmental population; Environmental memory pools are constructed to store memory cells, at the same time, environmental recognition operator is designed to examine the environments changing over time, the initial population of similar or same environments are generated via introducing some memory cells into the current population, which accelerates the DCIOA's convergence. In numerical experiments, four well-known dynamic evolutionary algorithms are selected to compare with the DCIOA by three groups of dynamic high dimensional knapsack problems. The results indicate that the DCIOA shows a promising convergence capability, meanwhile, we will also show that our algorithm improves its response over time, a kind of secondary response present in the immune system, and can track more rapidly the optimum in similar environments and requires less time than the other algorithms proposed in literature. © 2013 IEEE.


Li Z.,South-Central University for Nationalities | Li Y.,East China Normal University | Li Y.,Anshun College | Li J.,South-Central University for Nationalities
Journal of Chemical Physics | Year: 2012

We perform density functional studies of the support effects on the gold-catalyzed dissociation of H2 using the model clusters (Au 10 and Au13) on ZnO(101) surface and find that H 2 prefers to adsorb on the bottom layer of Au clusters on the ZnO surface. The interaction energies of H2 are exponentially correlated with the H-H and H-Au bond parameters. The dissociation of H2 easily occurs on the bottom layer with the energy barriers no more than 0.44 eV. The support effects on the dissociation barriers are greatly dependent on the H-H bond distance in the transition state (TS), i.e., the early TSs with small barriers have larger support effects than the late TSs with large barriers. We find that the charge transfer from the gold clusters to the oxide support creates the localized charging states of the interface gold with the high feasibility for H2 activation and dissociation. © 2012 American Institute of Physics.


Meng B.,Hunan University | Meng B.,Anshun College | Wang L.-L.,Hunan University | Li X.-F.,Hunan University | And 4 more authors.
Optics Communications | Year: 2012

To tailor the bandwidth and the group-velocity dispersion, we demonstrate a novel waveguide based on a photonic crystal within a triangular array with crescent-like-shaped air holes. By changing the angle between the waveguide axis and symmetric axis of the air hole from 0 to π/2, we find that the available bandwidth with a nearly constant group index in excess of 22 increases from 7 nm to 13 nm, that the corresponding normalized delay-bandwidth product increases from 0.202 to 0.245, and that the absolute value of the group-velocity dispersion decreases from 13.500 ps 2/km to 10 ps 2/km. The origin of all the findings is related to the widening of the slow-light region with the increasing of the angle. © 2012 Elsevier B.V. All rights reserved.


Pang L.,Chinese Academy of Forestry | Pang L.,Anshun College | Zhou Z.-C.,Chinese Academy of Forestry | Zhang Y.,Chinese Academy of Forestry | Feng Z.-P.,Laoshan Forest Farm of Chun'an County of Zhejiang Province
Chinese Journal of Ecology | Year: 2016

The enhanced atmospheric N deposition in recent years has brought the increases in N availability and N/P ratio in forest soils, which would impact the growth and productivity of plants. Pinus massoniana, Cunninghamia lanceolata and Schima superba are the main afforestation tree species with different growth and biological characteristics in southern China. Taking seedlings of the three tree species as test materials, a pot experiment was conducted to simulate low P soil conditions in combination with two N deposition levels, to study interspecific differences in growth and adaptation mechanism to low P stress under N addition. The results showed that: 1) The aboveground part growth of P. massoniana and S. superba was promoted by simulated N deposition, but their root growth and root biomass accumulation were inhibited. The whole plant biomass of P. massoniana and S. superba were not significantly changed under simulated N deposition. The aboveground part and root growth of C. lanceolata were severely inhibited by simu lated N deposition, so its whole plant biomass was significantly decreased; 2) The degree of low P stress of the three tree species seedlings was increased by simulated N deposition, which led to the increase of root secreted APase activity and organic acids. The increased degrees of total amount of root secretion of P. massoniana and S. superba were greater than that of C. lanceolata; 3) Simulated N deposition increased leaf N contents of the three tree species, but decreased their leaf P contents, thus increased their leaf N/P ratios. The increased degree of leaf N/P of C. lanceolata was the maximum, and that of P. massoniana was the minimum. The rapid increase of leaf N/P ratio of C. lanceolata resulted in the relative scarcity of its leaf P content and imbalance of leaf N and P nutrients, finally influenced C. lanceolata leaf photosynthesis. The increased degree of leaf N/P ratios of P. massoniana and S. superba were relatively small. The increase of leaf N contents of P. massoniana and S. superba promoted their leaf net photosynthetic rates; 4) Under simulated N deposition, the acidification of surface soil of P. massoniana and S. superba was greater than that of C. lanceolata, while soil hydrolytic N contents of P. massoniana and C. lanceolata were increased as compared to S. superba due to greater N absorption and N leaching of surface soil of S. superba, and stronger surface soil N leaching of P. massoniana compared to C. lanceolata. In addition, soil available P contents of the three species were all decreased, and they were higher in the topsoil than in the subsoil under simulated N deposition © 2016, editorial Board of Chinese Journal of Ecology. All rights Reserved.


Zhang Z.,Guizhou University | Qian S.,Anshun College | Tu X.,Guizhou University
Proceedings - 2010 6th International Conference on Natural Computation, ICNC 2010 | Year: 2010

This work investigates a dynamic clonal selection algorithm suitable for time-varying nonlinear multi-objective problems with inequality constraints. In one such algorithm, several adaptive operators such as environmental detection, dynamic reproduction, adaptive mutation and reconstruction are designed specially. When the environment changes, the environmental detection operator related to the history information is first executed to generate an initial population helpful for rapidly capturing the time-varying Pareto front. Within a run period, the current population is divided into multiple layers as associated to the weak Pareto optimality concept. After so, different layers are required to evolve along different directions, relying upon their importance. The preliminary experiments through comparison demonstrate that the proposed algorithm can track adaptively the changing environment and also approximate rapidly the desired Pareto front for a given environment. © 2010 IEEE.


PubMed | Anshun College
Type: Journal Article | Journal: Guang pu xue yu guang pu fen xi = Guang pu | Year: 2012

Fourier transform infrared (FTIR) spectroscopy and second derivative IR spectroscopy were applied to analyze and evaluate different parts of Scorpio. The second derivative IR spectra show clear differences while the origin spectra are quite similar. It was found that proteins are the dominant components in each part and the tail has distinct proteins compared to the others; fats are mainly stored in the trunk; sulfates are ubiquitous in all parts. Interestingly, the back part of the trunk of degenerative Scorpio contains some purine. It was demonstrated that FTIR spectroscopy integrated with second derivative IR spectroscopy not only can offer a fast, comprehensive and objective methodology for analyzing and evaluating the micro-differences among the various parts of same medicinal materials, but also can provide a rational guidance for medicinal and pharmacological studies.

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