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Search Results: 1 - 10 of 69266 matches for " Yu Bao "
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How to Generate Chaos from Switching System: A Saddle Focus of Index 1 and Heteroclinic Loop-Based Approach
Fang Bao,Simin Yu
Mathematical Problems in Engineering , 2011, DOI: 10.1155/2011/756462
Abstract: There exist two different types of equilibrium points in 3-D autonomous systems, named as saddle foci of index 1 and index 2, which are crucial for chaos generation. Although saddle foci of index 2 have been usually applied for creating double-scroll or double-wing chaotic attractors, saddle foci of index 1 are further considered for chaos generation in this paper. A novel approach for constructing chaotic systems is investigated by applying the switching control strategy and yielding a heteroclinic loop which connects two saddle foci of index 1. A basic 3-D linear system with an arbitrary normal direction of the eigenplane, possessing a saddle focus of index 1 whose corresponding eigenvalues satisfy the Shil'nikov inequality, is first introduced. Then a heteroclinic loop connecting two saddle foci of index 1 will be formed by applying the switching control strategy to the basic 3-D linear system. The heteroclinic loop consists of an unstable manifold, a stable manifold, and a heteroclinic point. Under the necessary conditions for forming the heteroclinic loop, the intended two-segmented piecewise linear system which exhibits the chaotic behavior in the sense of the Smale horseshoe can be finally constructed. An illustrative example is given, confirming the effectiveness of the proposed method. 1. Introduction It is well known that saddle foci of index 2 are crucial for chaos generation in 3-D autonomous systems, where each saddle focus of index 2 creates one corresponding scroll or wing. Typical examples include the double-scroll Chua system, the double-wing Lorenz system, and so forth [1–5]. Among the three equilibrium points possessed by the double scroll Chua system, two are the saddle foci of index 2 with eigenvalues satisfying and , and one is the saddle focus of index 1 with eigenvalues satisfying , and . The two saddle foci of index 2 create two corresponding scrolls leading to the emergence of the double-scroll chaotic attractor [1]. Among the three equilibrium points possessed by the double-wing Lorenz system, two are the saddle foci of index 2 with eigenvalues satisfying , and , and one is the saddle point with eigenvalues , , satisfying , , and . The two saddle foci of index 2 create two corresponding wings leading to the emergence of the double-wing chaotic attractor [2]. Similarly in many other double-scroll systems or the double-wing generalized Lorenz system family, two saddle foci of index 2 generate two corresponding wings or two scrolls [6]. Multiscroll or multiwing chaotic attractors can also be further generated by extending the
Bis(acetato-κ2O,O′)[2,6-bis(1H-pyrazol-3-yl-κN2)pyridine-κN]manganese(II)
Fan Yu,Bao Li
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811010506
Abstract: In the title complex, [Mn(CH3CO2)2(C11H9N5)], the MnII atom is coordinated by the pyridine N atom and two pyrazole N atoms from a 2,6-bis(pyrazol-3-yl)pyridine ligand and four O atoms from two bidentate acetate ligands. The complex molecules are linked by intermolecular N—H...O hydrogen bonds into a chain along [010]. π–π interactions between the pyridine rings and between the pyrazole rings [centroid–centroid distances = 3.772 (2) and 3.546 (2) ] connect the chains.
N′-(3-Phenylallylidene)isonicotinohydrazide
Feng-Yu Bao
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808026287
Abstract: The asymmetric unit of the title compound, C15H13N3O, contains two similar molecules. Each molecule is non-planar, as indicated by the dihedral angles between the pyridine and benzene rings of 45.2 (2) and 56.6 (2)°. The crystal structure is consolidated by intermolecular N—H...O hydrogen bonds.
1-(4-Nitrophenyl)-2-(3-phenylallylidene)hydrazine
Feng-Yu Bao
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808021429
Abstract: In the title compound, C15H13N3O2, the nitrobenzene and benzene rings make a dihedral angle of 9.1 (2)°. The crystal structure is consolidated by intermolecular N—H...O hydrogen bonds.
2,6-Dichlorobenzaldehyde oxime
Feng-Yu Bao
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808033217
Abstract: In the title compound, C7H5Cl2NO, there are two molecules in the asymmetric unit. The molecules are essentially identical. Each molecule is connected to a symmetry-related molecule through an inversion center by O—H...N hydrogen bonds, building an R22(6) graph-set motif.
Dicyanido[tris(2-pyridylmethyl)amine]cobalt(III) hexafluoridophosphate
Fan Yu,Bao Li
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811012001
Abstract: In the title complex, [Co(CN)2(C18H18N4)]PF6, the CoIII atom together with one of the pyridyl rings and two cyanide anions are located on a mirror plane, while the P atom is located on an inversion centre. The CoIII atom exhibits an octahedral geometry, coordinated by four N atoms from the tris(2-pyridylmethyl)amine ligand with an average Co—N distance of 1.953 (2) , and two cyanide C atoms with an average Co—C distance of 1.895 (2) . The crystal packing is stabilized by intermolecular C—H...N and C—H...F interactions.
2,4-Dichlorobenzaldehyde 2,4-dinitrophenylhydrazone
Feng-yu Bao
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808020266
Abstract: The asymmetric unit of the title compound, C13H8Cl2N4O4, contains two independent but similar and almost planar molecules. An intramolecular N—H...O hydrogen bond is observed in each molecule.
Construction of Logistic Information System of Xinjiang Characteristic Fruits Based on Quick Response  [PDF]
Ying Xu, Liwei Bao, Yu Zhang, Nengbin Xie
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.510008
Abstract:
This paper presents a design of logistic information system of Xinjiang characteristic fruits which is studied from the perspective of consumer experiences; it aims to provide quick response to customers. The main advantages of this system are to integrate online and offline information, implement the whole industry chain traceability system and integrate advanced digital technologies.
Performance Improvement of Dye-Sensitized Solar Cell by Phenanthrothiadiazole Unit-Based π-Conjugated Bridge  [PDF]
Xiaoqiang Yu, Yi Wang, Tianyu Huang, Zhenhua Ci, Ming Bao
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.67004
Abstract:
New organic dyes (D1, D2, and D3) containing a phenanthrothiadiazole unit as a π-conjugated system, a triarylamine as an electron donor, and a cyanoacrylic acid moiety as an electron acceptor were synthesized. The optical and electrochemical properties of dyes D1, D2, and D3 were investigated, and their performance as sensitizers in solar cells was evaluated. Dye-sensitized solar cells based on dye D3 produced a photon-to-current conversion efficiency of 5.23% (Jsc = 9.70 mA/cm2, Voc = 0.77 V, ff 0.70) under 100 mW/cm2 simulated AM 1.5 G solar irradiation.
Discover personalized search engine model by mining Web logs
基于Web日志的个性化搜索引擎模型的发现*

BAO Yu,
鲍钰

计算机应用研究 , 2009,
Abstract: The Web site visitors' search was recorded in the Web server log files.Analyzing and exploring associations in the search keywords of single Web user could provide the personal search results.This paper discovered the single user search keywords association rule by using algorithm SUSKARD.
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