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Search Results: 1 - 10 of 50663 matches for " FAN Yong-Tao "
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Guided Mode Resonance Transmission Filters Working at the Intersection Region of the First and Second Leaky Modes

MA Jian-Yong,FAN Yong-Tao,

中国物理快报 , 2012,
Guided-mode resonant Brewster filter consisting of two homogenous layers and a single grating with an equal refractive index

Ma Jian-Yong,Fan Yong-Tao,

中国物理 B , 2012,
Abstract: In this paper, a new type of resonant Brewster filter (RBF) consisting of two homogenous layers and a single grating with an equal refractive index is presented. The properties are studied by using the plane waveguide method (PWM) and rigorous coupled-wave analysis (RCWA). It is found that the variation of the grating thickness does not effectively change the position of the resonant wavelength, however it has a remarkable effect on the line width, and the resonant peak can be adjusted back to its original position by slightly tuning the grating period. Moreover, by simultaneously tuning the thicknesses of the homogeneous layers above and beneath the grating structure, multiple channels can also be obtained when the RBF is illuminated at the Brewster angle calculated with the effective medium theory (EMT) of subwavelength grating. The adjacent optical thickness for acquiring the multiple channels is about three-quarters of the resonant wavelength. Furthermore, it is demonstrated that the line width at the operating resonant wavelength can be appreciably narrowed by tuning the thickness of the homogenous layer to its corresponding thickness without fine tuning the grating period or the thickness. Therefore, it is very useful for designing filters with different line widths at the desired wavelength. In addition, it is shown from our calculations that the symmetrical line feather can be obtained if the total optical thickness for the homogeneous layer meets the special condition.
Tetrakis(2,2′-bipyridyl)dichloridodi-μ3-hydroxido-di-μ2-hydroxido-tetracopper(II) dinitrate hexahydrate
Ying Fan,Yong-Tao Cui,Hui-Fen Qian,Jian-Lan Liu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s160053680804381x
Abstract: The tetranuclear copper(II) title complex, [Cu4Cl2(OH)4(C10H8N2)4](NO3)2·6H2O, has a crystallographically imposed centre of symmetry. The metal atoms display a distorted tetragonal-pyramidal coordination geometry, and are linked by two μ2- and two μ3-hydroxo groups, assuming a chair-like conformation for the Cu4O2 core. In the crystal, the complex molecules are linked into a three-dimensional network by intermolecular O—H...O, O—H...Cl, C—H...O and C—H...Cl hydrogen bonds and π–π stacking interactions with centroid–centroid separations of 3.724 (2) and 3.767 (3) .
Simulink Spread Spectrum Communication Based on Chaos Sequence

FAN Yi-ming,YANG Ya-tao,XU Yong-tao,

计算机科学 , 2009,
Abstract: The performance of the Chaos sequence was studied firstly, and the model to generate chaos sequences was designed and also applied to direct sequence spread spectrum (DSSS) communication system;this paper also simulated DS communication system based on chaos sequence by designing simulink modules, some simulation experiments were also implemented. By theories studying and experimental simulation, it is obvious that chaos spread spectrum sequence can improve the communication system reliability and Anti-jamm...
Effects of heavy metals on microbial biomass and activity in subtropical paddy soil contaminated by acid mine drainage

LI Yong-Tao,

生态学报 , 2004,
Abstract: Soil samples were collected from long-term metal-contaminated rice field in Dabao Shan area of Guangdong province, China. Soil physico-chemical properties, total contents and DTPA extractable fractions of Cu, Pb, Zn and Cd, and microbial biomass and organic carbon mineralization were investigated to analyze their relationships. Principal component analysis and stepwise regression were employed to characterize availability of heavy metals, microbial responses and their effect factors in the studied soil. The results showed that irrigation with acid mine drainage since end of 1960s resulted in high sulfur content, strong acidity, relatively low organic carbon and total nitrogen, as well as high contents of heavy metals and their DTPA extractable fractions. DTPA extractable metals were not only influenced principally by their total contents, but also were positively related to soil acidity and clay contents, and were negatively correlated with soil Mn contents. Excessive heavy metals remarkably reduced soil microbial biomass carbon, biomass nitrogen, ratio of biomass carbon to organic carbon and ratio of biomass nitrogen to total nitrogen. Metals also inhibited microbial respiratory activity and rate of mineralization of soil organic carbon, finally led to increase in soil C/N. In contrast, elevated heavy metals did not significantly influence microbial biomass C/N and metabolic quotient (qCO_2), which are considered as parameters of microbial community composition and physiological metabolism. Stepwise regression indicated that DTPA extractable metals, especially DTPA-Cu, were major factors affecting microbial biomass and carbon mineralization, rather than total contents. Apart from close relationship between metals and microbial indices, some soil physico-chemical characteristics, such as organic carbon and total nitrogen, were highly associated with microbial biomass carbon, nitrogen and soil basal respiration. Some linked microbial indices including ratio of biomass carbon to organic carbon, ratio of biomass nitrogen to total nitrogen, and CO_2 evolution per unit organic carbon, can decrease the blurring effect of soil spatial variability on study of metal stress. Our results further showed that metal indices were involved in regression models of influencing factors of such linked parameters, while most of soil physico-chemical parameters were eventually excluded from the models. It demonstrates that these linked indices could serve as microbial indicators of metal stress. In addition, soil sulfur did not show pronounced effect on availability of metals and change in soil microorganism. However, oxidation of sulfide was regarded as important cause of metal ion loose and acidification. Soil physico-chemical characteristics may indirectly influence microbial biomass and carbon mineralization through their effects on availability of heavy metals.

ZHANG Yong-tao,

资源科学 , 1999,
Abstract: The land resources attribute data base was established taking irrigated area of Daliushu key water conservancy project on Huanghe River as a case. Based upon this, a data base on management and application system was designed by using Faxbase so as to lay foundation for land resources exploitation of the irrigated area.
Piperidinium 3-hydroxy-2-naphthoate
Yong-Tao Wang,Gui-Mei Tang,Yong-Chun Zhang,Wen-Zhu Wan
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808025567
Abstract: The crystals of the title salt, C5H12N+·C11H7O3 , were obtained from a methanol/water solution of 3-hydroxy-2-naphthoic acid and piperidine at room temperature. In the crystal structure, the piperidinium cations display a chair conformation and link with hydroxynaphthoate anions via N—H...O and C—H...O hydrogen bonds. An intramolecular O—H...O interaction is also present.
Identifying Modules of Coexpressed Transcript Units and Their Organization of Saccharopolyspora erythraea from Time Series Gene Expression Profiles
Xiao Chang,Shuai Liu,Yong-Tao Yu,Yi-Xue Li,Yuan-Yuan Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0012126
Abstract: The Saccharopolyspora erythraea genome sequence was released in 2007. In order to look at the gene regulations at whole transcriptome level, an expression microarray was specifically designed on the S. erythraea strain NRRL 2338 genome sequence. Based on these data, we set out to investigate the potential transcriptional regulatory networks and their organization.
Bare Bones Pattern Formation: A Core Regulatory Network in Varying Geometries Reproduces Major Features of Vertebrate Limb Development and Evolution
Jianfeng Zhu,Yong-Tao Zhang,Mark S. Alber,Stuart A. Newman
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0010892
Abstract: Major unresolved questions regarding vertebrate limb development concern how the numbers of skeletal elements along the proximodistal (P-D) and anteroposterior (A-P) axes are determined and how the shape of a growing limb affects skeletal element formation. There is currently no generally accepted model for these patterning processes, but recent work on cartilage development (chondrogenesis) indicates that precartilage tissue self-organizes into nodular patterns by cell-molecular circuitry with local auto-activating and lateral inhibitory (LALI) properties. This process is played out in the developing limb in the context of a gradient of fibroblast growth factor (FGF) emanating from the apical ectodermal ridge (AER).
Behavior of a Logistic Map Driven by White Noise

YANG Zheng-Ling,GAO Yang,GAO Yong-Tao,ZHANG Jun,

中国物理快报 , 2009,
Abstract: In the real world, every nonlinear system is inevitably affected by noise. As an example, a logistic map driven by white noise is studied. Unlike previous studies which focused on the behavior under local parameters to find analytical results, we investigate the whole driven logistic map. For a white noise driven logistic map, its non-divergent interval decreases with increasing white noise. The white noise does not change the equilibrium point and two-cycle intervals in statistics, if the driven logistic map is kept non-divergent. In particular, chaos can be excited by white noise only after the four-cycle bifurcation begins. The latest result is a necessary condition which has not been given in the literature Int. J. Bifur. Chaos 18(2008)509], and it can be deduced from Sharkovsky's theorem. Numerical simulations prove these analytical results.
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