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Search Results: 1 - 10 of 120157 matches for " Hongxiao Wang "
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Diurnal Effects on Chinese Wild Ledum palustre L. Essential Oil Yields and Composition  [PDF]
Liangliang Zhang, Hongxiao Wang, Yongmei Wang, Man Xu, Xinyu Hu
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2017, DOI: 10.4236/jasmi.2017.72005
Abstract: This study was conducted to evaluate the diurnal effect on essential oil yield and composition of Ledum palustre L. grown in northern Inner Mongolia, China. Essential oil content and composition were determined and compared as a function of different harvesting times viz. 7:00 AM, 11:00 AM, 3:00 PM, 7:00 PM, and 11:00 PM within a day. The essential oil obtained by hydrodistillation was investigated by gas chromatography-mass spectrometry (GC-MS). The yield of essential oil was varied from 1.21% to 1.62%; the maximum oil yield was obtained at 3:00 PM and the minimum at 7:00 PM. Similar to oil yield, qualitative difference in essential oil composition of L. palustre was observed. For the best essential oil yields, L. palustre should be harvested during 11:00 AM to 3:00 PM.
Effect of Non-Thermal Plasma Modified NiAl Layered Double Hydroxides on the Removal of Fluoride from Aqueous Solution  [PDF]
Hongxiao Lu, Qiurong Li, Haiyan Xiao, Ranran Wang, Danyang Xie
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.59062
Abstract: In this paper, NiAl layered double hydroxides (NiAl-LDHs) has been modified by non-thermal plasma (NTP) to enhance the fluoride removal capacity of materials. The samples were characterized by X-ray diffraction, Fourier transform infrared spectrometer (FTIR), Thermogravimetric differential thermal analyzer (TG-DTA) and N2 adsorption-desorption. Effects of pH, co-existing anions, temperature and kinetics on F﹣ adsorption were investigated. The results showed that pH affects the adsorbent surface charge. The effective pH range for F﹣ removal was between 4.5 and 10. Lower pH potentially causes dissolution of NiAl-LDHs. The negligible interference of coexisting ions such as \"\" makes the NiAl-LDHs a promising sorbent for fluoride polluted water treatment.
Bis(2,6-dihydroxybenzoato-κ2O1,O1′)(nitrato-κ2O,O′)bis(1,10-phenanthroline-κ2N,N′)praseodymium(III)
Chiya Wang,Xiaojin Gu,Xinqing Wang,Hongxiao Jin
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810049767
Abstract: The mononuclear title complex, [Pr(C7H5O3)2(NO3)(C12H8N2)2], is isostructural with related complexes of other lanthanides. The Pr(III) atom is in a pseudo-bicapped square-antiprismatic geometry, formed by four N atoms from two chelating 1,10-phenanthroline (phen) ligands and six O atoms, four from two 2,6-dihydroxybenzoate (DHB) ligands and the other two from nitrate anions. π–π stacking interactions between the phen and DHB ligands [centroid–centroid distances = 3.518 (2) and 3.778 (2) ] and the phen and phen ligands [face-to-face separation = 3.427 (6) ] of adjacent complexes stabilize the crystal structure. Intramolecular O—H...O hydrogen bonds are observed in the DHB ligands.
Bis(2,6-dihydroxybenzoato-κ2O1,O1′)(nitrato-κ2O,O′)bis(1,10-phenanthroline-κ2N,N′)europium(III)
Bao Huang,Wang Chiya,Wang Xinqing,Hongxiao Jin
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810047148
Abstract: The title mononuclear complex, [Eu(C7H5O3)2(NO3)(C12H8N2)2], is isostructural with those of other lanthanides. The Eu atom is in a pseudo-bicapped square-antiprismatic geometry, formed by four N atoms from two chelating 1,10-phenanthroline (phen) ligands and by six O atoms, four from two 2,6-dihydroxybenzoate (DHB) ligands and the other two from a nitrate anion. π–π stacking interactions between phen and DHB ligands [centroid–centroid distances = 3.5312 (19) and 3.8347 (16) ], and between phen and phen ligands [face-to-face separation = 3.433 (4) ] of adjacent complexes stabilize the crystal structure. Intramolecular O—H...O hydrogen bonds are observed in the DHB ligands.
Numerical Simulation of Reaction-Diffusion Systems of Turing Pattern Formation  [PDF]
Gendai Gu, Hongxiao Peng
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2015, DOI: 10.4236/ijmnta.2015.44016
Abstract: Differential method and homotopy analysis method are used for solving the two-dimensional reaction-diffusion model. And the structure of the solutions is analyzed. Finally, the homotopy series solutions are simulated with the mathematical software Matlab, so the Turing patterns will be produced. Overall analysis and experimental simulation of the model show that the different parameters lead to different Turing pattern structures. As time goes on, the structure of Turing patterns changes, and the final solutions tend to stationary state.
Dechlorination of 2,4-dichlorophenol by nickel nanoparticles under the acidic conditions
Li Feng,XiaoPeng Ge,Yi Li,DongSheng Wang,HongXiao Tang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4549-1
Abstract: Metal nanoparticles are effective for remediation of contamination with a range of compounds including chlorinated organics. However, the sorption process of the passivation oxide layers on the metal nanoparticle surfaces may result in incomplete degradation of contaminants. This phenomenon can be prevented by an acidic washing procedure or reaction in an acidic medium. In this paper, nickel nanoparticles manufactured via the carbonyl powder process were analyzed using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy. The sorption and degradation of 2,4-dichlorophenol (2,4-DCP) by nickel nanoparticles under acidic conditions was then investigated. Transmission electron microscopy and XRD results showed that the nickel nanoparticles range in size from 10 to 20 nm, and a thin passivation layer of NiO is present on the surface. This oxide layer can be removed by pretreatment washing with acidic solutions. It was indicated that dechlorination was the key reaction pathway for degradation of 2,4-DCP by nickel nanoparticles under acidic conditions. The main degradation products were 4-Chlorophenol, 2-Chlorophenol, and Phenol, and among these, Phenol was dominant. The acidic medium promoted degradation by providing an appropriate pH, and H+ may be involved in the reaction. Dechlorination of 2,4-DCP by nickel nanoparticles under the acidic condition follows the second order kinetic model, and the rate constants at 298, 306, 316 K are 0.02, 0.2 and 0.3 (g L h) 1, respectively.
Characterization of Speciation Distribution of IPF-PFSi
聚铁硅型复合无机高分子絮凝剂的形态分布特征

Wang Dongsheng,Tang Hongxiao,
王东升
,汤鸿霄

环境科学 , 2001,
Abstract: The preparation and speciation distribution characteristic of a new kind of inorganic polymer flocculant(IPF)-PFSi were investigated in detail by the combination of direct and indirect speciation analysis methods. The experimental results show that the speciation distribution of PFSi is decided significantly with basicity, kinds of silica and Si/Fe ratio. Among them, the basicity is one of the main factors. SilicaA and silicaB exhibit a similar effect, while silicaC has limited effect on the hydrolysis of Fe(III). The typical speciation distribution and transformation property of PFCl changes limitedly with the introduction of silica species.
Bis(2,6-dihydroxybenzoato-κ2O1,O1′)(nitrato-κ2O,O′)bis(1,10-phenanthroline-κ2N,N′)samarium(III)
Guobo Hu,Chiya Wang,Dingfeng Jin,Hongxiao Jin
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810047136
Abstract: The title mononuclear complex, [Sm(C7H5O3)2(NO3)(C12H8N2)2], is isostructural with that of other lanthanides. The Sm atom is in a pseudo-bicapped square-antiprismatic geometry, formed by four N atoms from two chelating 1,10-phenanthroline (phen) ligands and by six O atoms, four from two 2,6-dihydroxybenzoate (DHB) ligands and the other two from a nitrate anion. π–π stacking interactions between phen and DHB ligands [centroid–centroid distance = 3.528 (4) and 3.812 (3) ], and phen and phen ligands [face-to-face separation = 3.420 (10) ] of adjacent complexes stabilize the crystal structure. Intramolecular O—H...O hydrogen bonds are observed in the DHB ligands.
Bis(2,6-dihydroxybenzoato-κ2O1,O1′)(nitrato-κ2O,O′)bis(1,10-phenanthroline-κ2N,N′)cerium(III)
Xiaojian Gu,Chiya Wang,Bo Hong,Hongxiao Jin
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810049755
Abstract: The mononuclear title complex, [Ce(C7H5O3)2(NO3)(C12H8N2)2], is isostructural to other related lanthanide structures. The Ce atom is in a pseudo-bicapped square-antiprismatic geometry formed by four N atoms from two chelating 1,10-phenanthroline (phen) ligands and by six O atoms, four from two 2,6-dihydroxybenzoate (DHB) ligands and the other two from a nitrate anion. π–π stacking interactions between phen and DHB ligands [centroid–centroid distances = 3.513 (3) and 3.762 (2) ] and phen and phen ligands [face-to-face separation = 3.423 (7) ] of adjacent complexes stabilize the crystal structure. Intramolecular O—H...O hydrogen bonds are observed in the DHB ligands.
Some new results on the dynamical behavior of non-autonomous logistic system with random perturbation
Hu Hongxiao
Mathematics , 2012,
Abstract: In this paper, a non-autonomous stochastic logistic system is considered. An interesting result on the effect of stochastically perturbation for the dynamic behavior are obtained. That is, under certain conditions the stochastic system have similar dynamic behave with the deterministic system, but if the noise is sufficiently large, it will spoil these nice properties. Furthermore, we introduce a new research method for studying the stochastic equation and some new sufficient conditions for the stochastic bounded, stochastic permanence, extinction and global attractivity of the system are established. The corresponding results are improved and extended.
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