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Search Results: 1 - 10 of 14756 matches for " NIE Yao "
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Fuzzy Ordering Theory and Its Use in Filter Generalization
Barner Kenneth E,Nie Yao,An Wei
EURASIP Journal on Advances in Signal Processing , 2001,
Abstract: The rank ordering of samples is widely used in robust nonlinear signal processing. Recent advances in nonlinear filtering algorithms have focused on combining spatial and rank (SR) order information into the filtering process to allow spatial correlations to be exploited while retaining the robust characteristics of strict rank order methods. Further generalization can be achieved by replacing the crisp, or binary, SR information utilized by most methods with more general fuzzy SR information. Indeed, by exploiting fuzzy methodologies real valued SR orderings can be defined that not only relate the spatial and rank orderings of samples, but also includes information on sample spread. This paper utilizes this approach to define fuzzy ranking and fuzzy order statistics. Properties of these concepts are discussed and several previously defined filters are generalized by including fuzzy concepts. Specifically, the fuzzy median, fuzzy rank conditioned rank selection, and fuzzy weighted median filters are defined. Optimization of the parameters for these filters are discussed. Simulation results are presented to show the advantages of these fuzzy filters over their crisp counterparts.
Factors Influencing Aggression Levels in Root Vole Populations under the Effect of Food Supply and Predation
Haiyan Nie,Mingcan Yao,Jike Liu
ISRN Ecology , 2013, DOI: 10.1155/2013/948915
Abstract: Which factor determines animal aggressivity? Wynn-Edwards proposed the hypothesis that aggressive level increases with population density; Adams and Mesterton-Gibbons proposed the hypothesis that body weight is an indicator of animal aggressivity; however, Smith and Price hypothesized that aggression level varied with external conditions; that is, the population lived in the most unfavorable environment demonstrated the highest average aggression level, and the population that lived under the most favorable external conditions demonstrated the lowest average aggression level. In this paper, we tested these three hypotheses by manipulating enclosed root vole (Microtus oeconomus) populations under different food and predation treatments and observed their aggressive behavior. Aggressive behavior was measured by matching mice in a neutral arena. The experimental results supported Smith and Price’s hypothesis and Adams and Mesterton-Gibbons’s hypothesis; however, they did not support Wynn-Edwards’ hypothesis. Moreover, we found that reproductively active individuals were more aggressive. We concluded that the growth of population density did not cause or otherwise bring about increased aggressive behavior of root voles, but the external factors (predation and food supply) and physical factors (body weight and reproductive condition) were significantly correlated with aggression levels in a root vole population. 1. Introduction Wynn-Edwards’ hypothesis proposed that animals adjust their population density to available resources through social behavior and that aggressive behavior increases with population density [1]. Some subsequent field experiments supported this hypothesis [2–8]. However, Vale et al. demonstrated another aspect of the relationship between agonistic behavior and population density [9]. They showed that with different genetic strains of mice at equal densities, one strain was aggressive and the other was not. Lidicker examined patterns of wounding in population of California vole (Microtus californicus, Peale, 1848) and concluded that season was more important than density in determining levels of aggression [10]. Aggression levels of fluctuating arvicoline populations have been assessed by observation of agonistic behavior during dyadic encounters in neutral arenas for five species: meadow vole Microtus pennsylvanicus (Ord, 1815) [5, 11–13], prairie vole Microtus ochrogaster (Wagner, 1842) [12, 13], beach vole Microtus breweri (Baird, 1858) [14], red-backed vole Clethrionomys gapperi (Vigors, 1830) [15], and Townsend’s vole Microtus
Gibberellins and heterosis of plant height in wheat (Triticum aestivum L.)
Yi Zhang, Zhongfu Ni, Yingyin Yao, Xiuling Nie, Qixin Sun
BMC Genetics , 2007, DOI: 10.1186/1471-2156-8-40
Abstract: In this study, heterosis in plant height was determined in two wheat hybrids, and it was found that the increased elongation of the uppermost internode contributed mostly to the heterosis in plant height. Higher GA4 level was also observed in a wheat hybrid. By using the uppermost internode tissues of wheat, we examined expression patterns of genes participating in both GA biosynthesis and GA response pathways between a hybrid and its parental inbreds. Our results indicated that among the 18 genes analyzed, genes encoding enzymes that promote synthesis of bioactive GAs, and genes that act as positive components in the GA response pathways were up-regulated in hybrid, whereas genes encoding enzymes that deactivate bioactive GAs, and genes that act as negative components of GA response pathways were down-regulated in hybrid. Moreover, the putative wheat GA receptor gene TaGID1, and two GA responsive genes participating in internode elongation, GIP and XET, were also up-regulated in hybrid. A model for GA and heterosis in wheat plant height was proposed.Our results provided molecular evidences not only for the higher GA levels and more active GA biosynthesis in hybrid, but also for the heterosis in plant height of wheat and possibly other cereal crops.Heterosis or hybrid vigour was defined as the better performance of hybrid plants over its parental inbreds in terms of viability, growth and productivity. Hybrid cultivars have been used in many crop plants and have made significant contribution to the world food supply [1]. However, molecular basis of heterosis is still poorly understood. Recent studies suggested that differential or nonadditive gene expression in hybrid might contribute to the heterosis [2-6]. By using diallel crosses, it was shown that some of the differential expression patterns detected between hybrids and their parents in leaf tissues were significantly correlated with heterosis observed in agronomic traits in rice [7] and wheat [3]. Subsequent ide
Asymmetric Conversion of 1-Phenyl-1,2-ethanediol by Candida parapsilosis SYB-1
全细胞近平滑假丝酵母(Candida parapsilosis)SYB–1不对称转化苯基乙二醇

NIE Yao,XU Yan,

过程工程学报 , 2003,
Abstract: Optically active 1-phenyl-1,2-ethanediol is an extremely valuable and versatile alcohol used as a chiral building block in organic synthesis. Among the microorganisms which are able to produce S-1-phenyl-1,2-ethanediol from the racemate by asymmetric conversion, Candida parapsilosis SYB-1 was selected as an candidate biocatalyst for the preparation of S-1-phenyl-1,2-ethanediol with the optical purity of 91% e.e. and the yield of 88%. It is found that the optimal conditions for biocatalytic conversion were 5% cells, 8?R,S-1-phenyl-1,2-ethanediol, pH 6.5, temperature 33oC and reaction time 48 h. Under such conditions, the optical purity of S-1-phenyl-1,2-ethanediol was improved from 91% e.e. to 99% e.e. By detecting the intermediate produced in the reaction by GC-MS, it was suggested that S-enantiomer was produced from the intermediate identified as b-hydroxyacetophenone by asymmetric reduction after stereoselective oxidation of R-enantiomer to b-hydroxyacetophenone.
Effects of an antibacterial membrane on osteoblast-like cells in vitro
Ye J,Yao Q,Mo A,Nie J
International Journal of Nanomedicine , 2011,
Abstract: Jun Ye1, Qianqian Yao1, Anchun Mo2, Jing Nie2, Wenwen Liu1, Cui Ye1, Xianji Chen11State Key Laboratory of Oral Diseases, 2Department of Oral Implant, West China College of Stomatology, Sichuan University, Chengdu, People's Republic of ChinaAbstract: Infection around membranes is often found in guided bone regeneration (GBR). The excellent antibacterial properties of Ag-nHA-nTiO2/polyamide-66 (PA66) nanocomposite membranes have been demonstrated previously. The aim of this study was to observe the microstructure of an Ag-nHA-nTiO2/PA66 membrane and its effects on osteoblast-like cells in vitro. An Ag-nHA-nTiO2/PA66 membrane was used in the experimental group, and both nHA/PA66 and expanded poly tetrafluroethylene (e-PTFE) membranes were set as control. MG63 osteoblast-like cells were cultured on the three kinds of membrane and tissue culture polystyrene (TCP). The microstructure of the above membranes and the cells adhered on them were detected by scanning electronic microscope (SEM). Cell proliferation was determined by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, cell viability with a cell viability analyzer, and alkaline phosphatase (ALP) activity and Ca2+ concentration of osteoblast-like cell matrix by enzyme-linked immunosorbent assay. SEM showed that both Ag-nHA-nTiO2/PA66 membranes and nHA/PA66 membranes were composed of porous obverse face and smooth opposite face. The e-PTFE membranes showed elliptic surface structure with many tiny lined cracks. The MG63 cells adhered and proliferated well on all three kinds of membranes. Though cell viability on Ag-nHA-nTiO2/PA66 membranes was significantly lower than that of the control groups (P < 0.05), MTT values, ALP activity, and Ca2+ concentration did not differ significantly among the three kinds of membranes (P > 0.05). From these findings, it can be concluded that Ag-nHA-nTiO2/PA66 membranes are as biocompatible as nHA/PA66 membranes and TCP, thus may be applied safely in GBR.Keywords: guided bone regeneration, hydroxyapatite, polyamide-66, silver, TiO2, MG63, osteoblast-like cells
Critical Percolation Probabilities for the Next-Nearest-Neighboring Site Problems on Sierpinski Carpets
H. B. Nie,B. M. Yu,K. L. Yao
Physics , 2003,
Abstract: In this paper, we compute the next-nearest-neighboring site percolation (Connections exist not only between nearest-neighboring sites, but also between next-nearest-neighboring sites.) probabilities Pc on the two-dimensional Sierpinski carpets, using the translational-dilation method and Monte Carlo technique. We obtain a relation among Pc, fractal dimensionality D and connectivity Q. For the family of carpets with central cutouts,, where, the critical percolation probability for the next-nearest-neighboring site problem on square lattice. As D reaches 2, which is in agreement with the critical percolation probability on 2-d square lattices with next-nearest-neighboring interactions.
Comprehensive Research on the Origin of the Solar System Structure by Quantum-like Model  [PDF]
Qingxiang Nie
International Journal of Astronomy and Astrophysics (IJAA) , 2011, DOI: 10.4236/ijaa.2011.12008
Abstract: A quantum-like model of gravitational system is introduced to explore the formation of the solar system structure. In this model, the chaos behavior of a large number of original nebular particles in a gravitational field can be described in terms of the wave function satisfying formal Schrödinger equation, in which the Planck constant is replaced by a constant on cosmic scale. Numerical calculation shows that the radial distribution density of the particles has the character of wave curves with decreasing amplitudes and elongating wavelengths. By means of this model, many questions of the solar system, such as the planetary distance, mass, energy, angular momentum, the distribution of satellites, the structure of the planetary rings, and the asteroid belt and the Kuiper belt etc., can be explained in reason. In addition, the abnormal rotations of Venus and Mercury can be naturally explained by means of the quantum-like model.
A Study on the Second-Person Narrative in Jennifer Egan’s Black Box  [PDF]
Baoyu Nie
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.310008
Abstract: Notable for the second-person Twitter narrative, Jennifer Egan’s 2012 short science fiction Black Box is one of the most triumphant and fully-fledged fictions written in the form of new media. This paper mainly explores the second-person narrative employed in Black Box, pointing out that the second-person narrative leads the reader to participate in the story, allowing the reader to sense the same feelings as the protagonist does. From the second person’s perspective, Egan expresses her concerns and worries about the security of the American security as well as the whole world in the post-”9·11” period and at the same time she embraces the virtues and pleasures of traditional storytelling delivered through a wholly new digital format. This paper concludes that Black Box is perhaps one of the boldest experiments of narrative form and it is a direct exploration into the contemporary image culture.
When Internal Control Meets Internal Audit: Conflict or Combine?  [PDF]
Jingwen Nie
Open Journal of Accounting (OJAcct) , 2017, DOI: 10.4236/ojacct.2017.62004
Abstract: The long-term development of enterprises not only need the escort of internal control, but also can’t do without the monitoring and early warning of internal audit. The relationship between internal control and internal audit is simple and mysterious. When the company internal control meets internal audit, is there conflict brings a lose-lose situation or combination brings a win-win complexion? This article explored the internal control and internal audit of China International Marine Containers (Group) Ltd. (CIMC), and found that the combination of the two makes CIMC steady and quickly develop, and it finally becomes a world-class enterprise.
Communities of gastrointestinal helminths of fish in historically connected habitats: habitat fragmentation effect in a carnivorous catfish Pelteobagrus fulvidraco from seven lakes in flood plain of the Yangtze River, China
Wen X Li, Pin Nie, Gui T Wang, Wei J Yao
Parasites & Vectors , 2009, DOI: 10.1186/1756-3305-2-22
Abstract: A total of 11 species of helminths were recorded in the stomach and intestine of P. fulvidraco from seven lakes, including two lakes connected with the Yangtze River, i.e. Poyang and Dongting lakes, and five isolated lakes, i.e. Honghu, Liangzi, Tangxun, Niushan and Baoan lakes. Mean helminth individuals and diversity of helminth communities in Honghu and Dongting lakes was lower than in the other five lakes. The nematode Procamallanus fulvidraconis was the dominant species of communities in all the seven lakes. No significant difference in the Shannon-Wiener index was detected between connected lakes (0.48) and isolated lakes (0.50). The similarity of helminth communities between Niushan and Baoan lakes was the highest (0.6708), and the lowest was between Tangxun and Dongting lakes (0.1807). The similarity was low between Dongting and the other lakes, and the similarity decreased with the geographic distance among these lakes. The helminth community in one connected lake, Poyang Lake was clustered with isolated lakes, but the community in Dongting Lake was separated in the tree.The similarity in the helminth communities of this fish in the flood-plain lakes may be attributed to the historical connection of these habitats and to the completion of the life-cycles of this fish as well as the helminth species within the investigated habitats. The diversity and the digenean majority in the helminth communities can be related to the diet of this fish, and to the lacustrine and macrophytic characters of the habitats. The lake isolation from the river had little detectable effect on the helminth communities of the catfish in flood-plain lakes of the Yangtze River. The low similarities in helminth communities between the Dongting Lake and others may just be a reflection of its unique water environment and anthropogenic alterations or fragmentation in this lake.Human activities greatly alter the size, shape, and spatial arrangement of natural habitats, and habitat fragmentat
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