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Search Results: 1 - 10 of 108746 matches for " Juan Chen "
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An Efficient Method to Reduce the Numerical Dispersion in the HIE-FDTD Scheme  [PDF]
Juan Chen, Anxue Zhang
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.21005
Abstract: A parameter optimized approach for reducing the numerical dispersion of the 3-D hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) is presented in this letter. By adding a parameter into the HIE-FDTD formulas, the error of the numerical phase velocity can be controlled, causing the numerical dispersion to decrease significantly. The numerical stability and dispersion relation are presented analytically, and numerical experiments are given to substantiate the proposed method.
Analysis of Switching Overvoltage in Regional Grid with Small Hydropower Plants  [PDF]
Juan Chen, Haifeng Li
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.59B004
Abstract: Present-day small hydropower plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation, therefore, there are many SHPs in places of China where are rich in water resources. However, it has caused overvoltages in the distribution network, and which is even worse for the switching overvoltage such as isolated network operation, changing power supply path. The simple network model is used to analyze the reasons of the switching overvoltage, and the simulation software DIgSILENT/PowerFactory is used to check out the results of the theoretical analysis.
Dichloridobis{N-[(dimethylamino)dimethylsilyl]-2,6-dimethylanilido-κ2N,N′}zirconium(IV)
Juan Chen
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809039804
Abstract: The monomeric title zirconium(IV) compound, [Zr(C12H21N2Si)2Cl2], was prepared by the metathetical reaction of [LiN(SiMe2NMe2)(2,6-Me2C6H3)]2 with zirconium tetrachloride. The ZrIV atom is N,N′-chelated by the N-silylated anilido ligand. Along with two Cl atoms, the six-coordinated ZrIV atom demonstrates a highly distorted octahedral geometry. The two ligands around the ZrIV atom are arranged cis to each other and obey the C2 symmetry operation. That means the asymmetric unit consists of only half of the molecular compound and the complete molecule is generated by a twofold axis. The two ends of the N—Si—N chelating unit exhibit different affinities for the metal center. The Zr—Namino bond is longer than the Zr—Nanilido bond.
Chloridobis{N-[(dimethylamino)dimethylsilyl]-2,6-dimethylanilido-κ2N,N′}titanium(III)
Juan Chen
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810025092
Abstract: In the monomeric title titanium(III) compound, [Ti(C12H21N2Si)2Cl], the metal atom is surrounded by two N–silylated anilide ligands in an N,N′′-chelating mode. The two ends of the N—Si—N chelating unit exhibit different affinity to the metal center. The Ti—Namine bond is longer than the Ti—Nanilide bond by about 0.29 . The two ligands are arranged trans to each other and the molecule demonstrates a pseudo-twofold rotation along the axis of the Ti—Cl bond. The five–coordinate Ti atom demonstrates a highly distorted trigonal-bipyramidal geometry.
Bis{μ-N-[(dimethylamino)dimethylsilyl]-2,6-dimethylanilido}-κ2N:N′;κ2N′:N-dicopper(I)
Juan Chen
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810042881
Abstract: The title compound, [Cu2(C12H21N2Si)2], is a binuclear CuI complex. The dimeric molecule has an inversion center located at the mid-point of the Cu—Cu bond [Cu—Cu = 2.7209 (7) ]. The bidentate ligand behaves in an N:N′-bridging mode, coordinating the metal atoms. The N—Cu—N unit is close to being linear [176.60 (8)°]. The two N atoms exhibit different affinities for the metal atom. The Cu—Namino bond is longer than the Cu—Nanilido bond by 0.079 . The core of the molecule, the [Cu—N—Si—N]2 eight-membered ring, adopts a chair configuration.
Chlorido{N-[(diethylamino)dimethylsilyl]anilido-κN}(N,N,N′,N′-tetramethylethane-1,2-diamine-κ2N,N′)iron(II)
Juan Chen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812044741
Abstract: In the title iron(II) complex, [Fe(C12H21N2Si)Cl(C6H16N2)], the FeII cation is coordinated by two N atoms from the tetramethylethane-1,2-diamine ligand [Fe—N = 2.191 (5) and 2.215 (4) ], one N atom from the N-[(diethylamino)dimethylsilyl]anilide ligand [Fe—N = 1.943 (4) ] and a chloride ligand [Fe—Cl = 2.2798 (16) ] in a distorted tetrahedral geometry. The N—Si—N angle is 113.9 (3)°. The crystal packing exhibits no short intermolecular contacts.
Bis[μ-N-(diethylamino-κN)dimethylsilylanilido-κ2N:N]bis[chloridocobalt(II)]
Juan Chen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811054602
Abstract: In the title binuclear CoII complex, [Co2(C12H21N2Si)2Cl2], an inversion center is located at the mid-point between the two Co atoms in the dimeric molecule. The bidentate N-silylated anilide ligand coordinates the CoII atom in an N,N′-chelating mode and provides the anilide N atom as a bridge to link two CoII atoms. The two ends of the N—Si—N chelating unit exhibit different affinities for the metal atom. The Co—Nanilide bond is 2.031 (6) and Co—Namino bond is 2.214 (6) . The four-coordinate Co atom presents a distorted tetrahedral geometry, while the dimeric aggregation exhibits a (CoN)2 rhombus core with 1.998 (6) as the shortest sides and shows a ladder structure composed of Co, N and Si atoms.
Chloridobis{N-[(dimethylamino)dimethylsilyl]-2,6-dimethylanilido-κ2N,N′}iron(III)
Juan Chen
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808018114
Abstract: The title iron(III) compound, [Fe(C12H21N2Si)2Cl], is monomeric. The Fe atom is N,N′-chelated by the N-silylated anilide ligand. The two ligands around the Fe atom are arranged trans to each other. The Fe—Namino bond is longer than the Fe—Nanilide bond by about 0.37 . The molecule displays a pseudo-twofold rotation. The five–coordinate Fe atom demonstrates a highly distorted trigonal–bipyramidal geometry.
Research On College Tennis Intensive Courses Online Teaching Design: Taking Jiangxi Normal University as an Example  [PDF]
Kaiqiang Guo, Juan Pu, Zhidao Chen
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.38B012
Abstract: Physical intensive course construction is an important component of the teaching quality and teaching reform in colleges and universities. In this study, after reviewingliterature and applying computer network technology, PPT, Authorware, Flash, Windows movie maker, dartfish, super king and other educational softwares, taking Jiangxi Normal University college tennis intensive courses as an example, we research on how to design an online platform for the college tennis intensive course in a university.  In tennis professional intensive courses online teaching design, we must first recognize that tennis is a sports skills curriculum based on body movements as the carrier, commonly known as \"technology class”. Secondly, teachers should effectively use information equipment and information resources, so that they can have the abilities to process information, create new information, and do research. They should also focus on teaching objectives. Network instructional designrequires students to actively participate in the interaction and form their own characteristics and style. Thirdly, making an interactive platform of the students' skill level evaluation and diagnosis can avoid students' cognitive performance remaining at an only digital cinema demo viewing stage, thus achieving scientificalness, consistency, and effectiveness in the tennis teaching evaluation. In the future, the construction of the university physical intensive courses, applications and practice of online teaching design requires constantly integration and innovation from teaching concepts, theoretical models and change in methods.
Research on Modes of Cargo Ro-Ro, Drop and Pull Transport in Land-Sea Transportation Channel between Shandong and Liaoning  [PDF]
Yongsheng Liu, Yu Li, Juan Chen
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.82025
Abstract: In order to accelerate national industrial upgrading of transportation and deepen the development of logistics industry, it is imperative to construct the land-sea transportation channel between Shandong and Liaoning provinces. Taking practical situations of the two places into account, the paper aims to investigate the application of M to N mode in the process of cargo roll on-roll off, drop and pull transport and then elaborate the site selection issue of drop and pull centers from the perspective of P-median model. Meanwhile, the paper proposes to adopt “south bridging-north rolling” concept to build a brand new transportation channel which combines the cross-sea bridge with ro-ro ferry concerning the natural conditions in Bohai Bay. Corresponding solution to each project will be put forward at last.
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