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Search Results: 1 - 10 of 144458 matches for " Jian-Cheng Zhang "
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Resonant Characteristics of Frequency Selective Surfaces on Ferrite Substrates
Jian-Cheng Zhang;Ying-Zeng Yin;Rongping Yi
PIER , 2009, DOI: 10.2528/PIER09072702
Abstract: The resonant characteristic of frequency selective surfaces (FSSs) on in-plane biased ferrite substrates for the TE polarization is described. An approximate formula for evaluating the resonant frequency is presented. The tunable property of the resonant frequency of a dipole FSS is firstly demonstrated by the results obtained from the moment method (MM) and the waveguide simulator measurement. Then the approximate formula is validated by the MM as well as measured results already published in a previous paper. It is interesting to note that two separate resonances occur at any magnetic bias field, and both increase as the magnetic bias field increases. The fractional tuning range is investigated based on the approximate formula. The results show that it increases as the saturation magnetization increases and decreases as the center frequency increases.
Clean Development Mechanism Cooperation in China  [PDF]
Ye Qian, Jian-Cheng Bin
Low Carbon Economy (LCE) , 2011, DOI: 10.4236/lce.2011.24025
Abstract: The Clean Development Mechanism (CDM) is an arrangement under the Kyoto Protocol allowing developed countries with a greenhouse gas reduction commitment to invest in projects that reduce emissions in developing countries as an alternative to more expensive emission reductions in their own countries. In terms of the CDM areas, there are huge potential commercial opportunities between China and the United Kingdom since China signed the Kyoto Protocol.
(E)-3-[(4-Diethylamino-2-hydroxybenzylidene)amino]benzonitrile
Jian-Cheng Zhou,Zheng-Yun Zhang,Nai-Xu Li,Chuan-Ming Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809050144
Abstract: The molecule of the title compound, C18H19N3O, displays a trans configuration with respect to the C=N double bond. There is a strong intramolecular O—H...N hydrogen-bonding interaction between the hydroxy group and imine N atom. The dihedral angle between the aromatic rings is 30.35 (8)°. The crystal packing is stabilized by O—H...N links.
(E)-4-[4-(Dimethylamino)benzylideneamino]benzonitrile
Jian-Cheng Zhou,Zheng-Yun Zhang,Nai-Xu Li,Chuan-Ming Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809047023
Abstract: The molecule of the title compound, C16H15N3, displays a trans configuration with respect to the C=N double bond. The molecule is not planar, the dihedral angle between the benzene rings being 57.83 (9)°. The crystal packing is stabilized only by van der Waals interactions.
(E)-3-(2-Hydroxy-3-methoxybenzylideneamino)benzonitrile
Jian-Cheng Zhou,Chuan-Ming Zhang,Zheng-Yun Zhang,Nai-Xu Li
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809029225
Abstract: The molecule of the title compound, C15H12N2O2, displays a trans configuration with respect to the C=N double bond. The dihedral angle between the two benzene rings is 30.46 (14)°. A strong intramolecular O—H...O hydrogen bond stabilizes the molecular structure.
(E)-3-(2-Hydroxy-4-methoxybenzylideneamino)benzonitrile
Jian-Cheng Zhou,Zheng-Yun Zhang,Chuan-Ming Zhang,Nai-Xu Li
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809023174
Abstract: In the molecule of the title compound, C15H12N2O2, the aromatic rings are oriented at a dihedral angle of 28.11 (3)°. Intramolecular O—H...N hydrogen bonding results in the formation of a planar six-membered ring, which is nearly coplanar with the adjacent ring at a dihedral angle of 1.53 (3)°. In the crystal structure, π–π contacts between the benzene rings [centroid–centroid distance = 3.841 (1) ] may stabilize the structure.
(Z)-2-[(2-Hydroxy-1-naphthyl)methyleneamino]benzonitrile
Jian-Cheng Zhou,Chuan-Ming Zhang,Nai-Xu Li,Zheng-Yun Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809023708
Abstract: The title compound, C18H12N2O, crystallizes in a phenol–imine tautomeric form with a Z conformation for the imine functionality. The dihedral angle between the aromatic rings is 8.98 (9)°. A strong intramolecular O—H...N hydrogen-bond interaction between the hydroxyl group and imine N atom occurs.
(E)-2-[(3,5-Di-tert-butyl-2-hydroxybenzylidene)amino]benzonitrile
Jian-Cheng Zhou,Nai-Xu Li,Chuan-Ming Zhang,Zheng-Yun Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809019527
Abstract: The asymmetric unit of the title compound, C22H26N2O, contains three crystallographically independent molecules, in which the aromatic rings are oriented at dihedral angles of 21.74 (5), 27.59 (5) and 27.87 (5)°. Intramolecular O—H...N hydrogen bonds result in the formation of planar six-membered rings, and these are nearly coplanar with the adjacent rings. In the crystal structure, π–π contacts between the benzene rings [centroid–centroid distances = 3.989 (2), 3.802 (1) and 3.882 (1) ] may stabilize the structure.
1-(4-tert-Butylbenzyl)-2-(4-tert-butylphenyl)-1H-benzimidazole
Jian-Cheng Zhou,Zheng-Yun Zhang,Nai-Xu Li,Chuan-Ming Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809045668
Abstract: In the molecule of the title compound, C28H32N2, the benzimidazole ring system is almost planar [maximum deviation = 0.0221 (15) ] and forms dihedral angles of 85.86 (4) and 32.09 (6)° with the benzene rings. In the crystal structure, molecules are linked into chains running parallel to the a axis by intermolecular C—H...N hydrogen bonds. The methyl groups of a tert-butyl group are rotationally disordered over two positions with refined site-occupancy factors of 0.636 (4) and 0.364 (4).
(E)-2-[(5-Bromo-2-hydroxybenzylidene)amino]benzonitrile
Jian-Cheng Zhou,Nai-Xu Li,Chuan-Ming Zhang,Zheng-Yun Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809027950
Abstract: In the molecule of the title compound, C14H9BrN2O, the dihedral angle between the aromatic rings is 1.09 (4)°. Intramolecular O—H...N hydrogen bonding results in the formation of a planar (r.m.s. deviation = 0.0140 ) six-membered ring. In the crystal structure, intermolecular C—H...N interactions link the molecules into chains.
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