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Search Results: 1 - 10 of 57985 matches for " Qiao-Feng Zheng "
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Potential benefits of quinoxaline 1, 4-dioxides in aldosterone dysmetabolism disease—A medical hypothesis  [PDF]
Da-Jiang Zou, Qiao-Feng Zheng, Xian-Ju Huang, Xu Wang, Awais Ihsan
Open Journal of Animal Sciences (OJAS) , 2011, DOI: 10.4236/ojas.2011.13016
Abstract: Quinoxaline 1, 4-dioxides (QdNOs) are quinox-aline derivatives which have been used as an-timicrobial agents and growth promoters in animals widely. They are also assumed to cure human disease such as anticancer, antitubercular and inhibiting parasite. QdNOs such as carbadox and their major metabolites induced a special decline of aldosterone production from the swine adrenal in vivo and in vitro, and thus cause hypovolemia, hyponatremia and hyperkalemia. This can also be expected to be the case for human. As a mainly physiological hormone and a novel steroid with potent mineralocorticoid activity, aldosterone plays an important role in the pathophysiological process of brain, renal and heart disease progression and may be a renal and vascular risk factor. Here, we provide evidence to support the hypothesis that QdNOs may lead potential benefits in aldosterone dysmetabolism disease via the synthesis deficiency of aldosterone in adrenal and/or the cardiovascular tissues. If the hypothesis is true, it may provide a new option into the therapy for aldosterone dysmetabolism disease, especially in cardiovascular system, and thus assume a broader application of QdNOs.
Fabrication of high-quality three-dimensional photonic crystal heterostructures

Liu Zheng-Qi,Feng Tian-Hu,Dai Qiao-Feng,Wu Li-Jun,Lan Sheng,

中国物理 B , 2009,
Abstract: Three-dimensional photonic crystal (PC) heterostructures with high quality are fabricated by using a pressure controlled isothermal heating vertical deposition technique. The formed heterostructures have higher quality, such as deeper band gaps and sharper band edges, than the heterostructures reported so far. Such a significant improvement in quality is due to the introduction of a thin TiO2 buffer layer between the two constitutional PCs. It is revealed that the disorder caused by lattice mismatch is successfully removed if the buffer layer is used once. As a result, the formed heterostructures possess the main features in the band gap of constitutional PCs. The crucial role of the thin buffer layer is also verified by numerical simulations based on the finite-difference time-domain technique.
Optical switching based on the manipulation of microparticles in a colloidal liquid using strong scattering force

Liu Jin,Liu Zheng-Qi,Feng Tian-Hu,Dai Qiao-Feng,Wu Li-Jun,Lan Sheng,

中国物理 B , 2010,
Abstract:
The Application of New Chiral Ferrocene Ligands in Asymmetric Transfer Hydrogenation of Ketones  [PDF]
Yuan-Zhao Mo, Quan-Jun Wang, Hui-Fang Nie, Qiao-Feng Wang
International Journal of Organic Chemistry (IJOC) , 2018, DOI: 10.4236/ijoc.2018.81004
Abstract: Four easily available ferrocenyl chiral ligands have been screened firstly for ruthenium (II)-catalyzed asymmetric transfer hydrogenation of acetophenone with HCOOH/Et3N azeotrope as the hydrogen source. A moderate chemical yield of 1-phenylethanol with 83% ee was obtained when (RC, SFc)-1-(Diphe-nylphosphino)-2-[1-N-(3-methylpyridin-2-ylmethyl) ethyl] ferrocene (L1) was used. Particularly, both ruthenium and iridium could coordinate with L1 to accomplish the asymmetric reduction of series of aromatic ketones separately. The desired products were achieved with up to 86% ee.<
Modification of the spontaneous emission of quantum dots near the surface of a three-dimensional colloidal photonic crystal

Liu Zheng-Qi,Feng Tian-Hu,Dai Qiao-Feng,Wu Li-Jun,Lan Sheng,Ding Cai-Rong,Wang He-Zhou,Gopal Achanta Venu,

中国物理 B , 2010,
Abstract: This paper demonstrates experimentally and numerically that a significant modification of spontaneous emission rate can be achieved near the surface of a three-dimensional photonic crystal. In experiments, semiconductor core-shell quantum dots are intentionally confined in a thin polymer film on which a three-dimensional colloidal photonic crystal is fabricated. The spontaneous emission rate of quantum dots is characterised by conventional and time-resolved photoluminescence (PL) measurements. The modification of the spontaneous emission rate, which is reflected in the change of spectral shape and PL lifetime, is clearly observed. While an obvious increase in the PL lifetime is found at most wavelengths in the band gap, a significant reduction in the PL lifetime by one order of magnitude is observed at the short-wavelength band edge. Numerical simulation reveals a periodic modulation of spontaneous emission rate with decreasing modulation strength when an emitter is moved away from the surface of the photonic crystal. It is supported by the fact that the modification of spontaneous emission rate is not pronounced for quantum dots distributed in a thick polymer film where both enhancement and suppression are present simultaneously. This finding provides a simple and effective way for improving the performance of light emitting devices.
5-Methyl 3-(2-methylprop-3-yl) 2,6-dimethyl-4-(2-nitrosophenyl)pyridine-3,5-dicarboxylate
Hui Chen,Ding Qu,Qiao-Feng Wang,Ru Jiang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810005088
Abstract: In the title compound, C20H22N2O5, a photo-degradation product of the hypertension drug nisoldipine, the dihedral angle between the nitrosophenyl ring and the pyridine ring is 75.7 (3)°. In the crystal structure, weak C—H...O hydrogen bonds help to establish the packing.
Optimal Design of an Achromatic Angle-Insensitive Phase Retarder Used in MWIR Imaging Polarimetry

KANG Guo-Guo,TAN Qiao-Feng,JIN Guo-Fan,

中国物理快报 , 2009,
Abstract:
3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate
Jing Luo,Hui Chen,Qiao-Feng Wang,Hai-Jing Liu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810003235
Abstract: In the title compound, C18H17Cl2NO4, an oxidation product of felodipine, the dihedral angle between the benzene and pyridine rings is 75.3 (4)°. The crystal structure is stabilized by intermolecular C—H...O interactions.
Fabrication of high-quality colloidal photonic crystals with sharp band edges for ultrafast all-optical switching

Feng Tian-Hu,Dai Qiao-Feng,Wu Li-Jun,Guo Qi,Hu Wei,Lan Sheng,

中国物理 B , 2008,
Abstract: Application of the pressure controlled isothermal heating vertical deposition method to the fabrication of colloidal photonic crystals is systematically investigated in this paper. The fabricated samples are characterized by scanning electron microscope and transmission spectrum. High-quality samples with large transmissions in the pass bands and the sharp band edges are obtained and the optimum growth condition is determined. For the best sample, the transmission in the pass bands approaches 0.9 while that in the band gap reaches 0.1. More importantly, the maximum differential transmission as high as 0.1/nm is achieved. In addition, it is found that the number of stacking layers does not increase linearly with concentration of PS spheres in a solution, and a gradual saturation occurs when the concentration of PS spheres exceeds 1.5 wt.%. The uniformity of the fabricated samples is examined by transmission measurements on areas with different sizes. Finally, the tolerance of the fabricated samples to baking was studied.
Spectral properties of fcc-like cylindrical colloidal crystals
毛细管中柱对称类面心结构胶体晶体的光谱特性

Wei Zhong-Chao,Dai Qiao-Feng,Wang He-Zhou,
韦中超
,戴峭峰,汪河洲

物理学报 , 2006,
Abstract: Colloidal crystals are grown in capillaries. Experimental results demonstrate that these colloidal crystals are formed in a structure with cylindrical symmetry. The colloidal crystals are relatively stable. In all radial directions in the plan perpendicular to the axis of the capillary, the transmission spectra are the same and the wavelength of the band gaps are the longest. In other directions, the wavelength of the band gap is gradually blue shifted as the angle between light and axis of capillary decreases. This axial symmetry of band gap will have many potential applications.
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