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Search Results: 1 - 10 of 58338 matches for " XU Xuan-Bin "
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Crop water production function under dynamic optimal management of fertilizer supply

LIU Wen-Zhao,SU Min,XU Xuan-Bin,LI Yang-Yang,
,苏 敏,徐宣斌,李秧秧

中国生态农业学报 , 2001,
Abstract: Crop water production functions, including the type of water supply and the type of water consumption, under dynamic optimal management of fertilizer supply were derived from the water and fertilizer experiment of corn.The relations among the corn yield,water use efficiency,water consumption,and waetr supply were analyzed by the index of water consumption production elasticity.In addition,the function under dynamic fertilizer supply and the function under general fertility level were compared and analyzed.It was pointed out that the crop water production function in different year-types was difference,and it still needs a deeper study.
Simultaneously Large and Opposite Lateral Beam Shifts for TE and TM Modes on a Double Metal-Cladding Slab
LIU Xuan-Bin,CAO Zhuang-Qi,ZHU Peng-Fei,SHEN Qi-Shun,LIU Xiang-Min,

中国物理快报 , 2006,
Abstract: We report simultaneously large and opposite Goos-Hanchen shifts for TE and TM beams on a double metalcladding slab. Theoretical examination shows that both positive and negative lateral shifts are in two orders of the wavelength. It is also found that the magnitude of the lateral beam shift strongly depends on the thickness of the upper metal layer. The optimal thickness of the upper metal layer for zero reflection is found to be the critical thickness above which a negative beam shift occurs. Numerical calculations are in good agreement with the theoretical results.
Dynamic Feasible Region Genetic Algorithm for Optimal Operation of a Multi-Reservoir System
Bin Xu,Ping-An Zhong,Xinyu Wan,Weiguo Zhang,Xuan Chen
Energies , 2012, DOI: 10.3390/en5082894
Abstract: Seeking the optimal strategy of a multi-reservoir system is an important approach to develop hydropower energy, in which the Genetic Algorithm (GA) is commonly used as an effective tool. However, when the traditional GA is applied in solving the problem, the constraints of water balance equation, hydraulic continuity relationship and power system load demand might be violated by the crossover and mutation operator, which decreases the efficiency of the algorithm in searching for a feasible region or even leads to a convergence on an infeasible chromosome within the expected generations. A modified GA taking stochastic operators within the feasible region of variables is proposed. When determining the feasible region of constraints, the progressive optimal approach is applied to transform constraints imposed on reservoirs into a singular-reservoir constraint, and a joint solution with consideration of adjacent periods at crossover or mutation points is used to turn the singular-reservoir constraints into singular variable constraints. Some statistic indexes are suggested to evaluate the performances of the algorithms. The experimental results show that compared to GA adopting a penalty function or pair-wise comparison in constraint handling, the proposed modified GA improves the refinement of the quality of a solution in a more efficient and robust way.
Crayfish Carapace Micro-powder (CCM): A Novel and Efficient Adsorbent for Heavy Metal Ion Removal from Wastewater
Xiaodong Zheng,Bin Li,Bo Zhu,Rui Kuang,Xuan Kuang,Baoli Xu,Meihu Ma
Water , 2010, DOI: 10.3390/w2020257
Abstract: Crayfish carapace, a plentiful waste in China, was applied to remove divalent heavy metal ions—copper (Cu), cadmium (Cd), zinc (Zn), and lead (Pb)—from wastewater. The adsorption capacities of crayfish carapace micro-powder (CCM) for heavy metal ions were studied with adsorbent dosages ranging from 0.5–2.5 g/L and with initial metal concentrations ranging from 50–250 mg/L. CCM particle size, initial solution pH (from 2.5–6.5), temperature (from 25–65 °C) and calcium level (from 3.5–21.5%) were also varied in batch mode. The results indicated that the adsorption capacity increases with both decreasing particle size and increasing calcium level of the crayfish carapace. The kinetic studies indicated that the adsorption could be complete within 2 h, and that the data correlated with the pseudo-second-order model. CCM recorded maximum uptakes of 200, 217.39, 80, and 322.58 mg/g for Cu, Cd, Zn, and Pb, respectively. The adsorption capacities and removal efficiencies of CCM for metal ions were three-times higher than those of chitin and chitosan extracted from the CCM.
Preparation and Catalytic Kinetic of Hydrophobic Photocatalytic Catalysts
HU Xue-Bin,XU Xuan,JI Fang-Ying,FAN Zi-Hong
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.01115
Abstract: Sodium dodecyl sulfate (SDS) and copper oxide both were used to modify titanium dioxide photocatalytic catalysts. SDS was used to prepare hydrophobic titanium dioxide. Copper oxide was used to modify the visible light absorption capacity of titanium dioxide. FTIR, UV-Vis and 3-D fluorescence spectra methods were used to characterize the modified titanium dioxide photocatalytic catalysts. The modified titanium dioxide catalysts were used to treat nitrobenzene wastewater. Four factors including pH, initial nitrobenzene concentration, catalysts dosage and light intensity, were researched in a nitrobenzene degradation system that was treated under visible light. FTIR characterization shows that CC and CHfunctional groups appear on the surface of the catalysts. UV-Vis characterization shows that the catalysts modified by copper oxide have excellent visible light response capacity and their absorption edges reach or exceed 830nm. 3-D fluorescence spectra shows that holea2electrons are separated well after copper oxide and/or SDS is added. The speed of nitrobenzene degradationis fastest when pH is 9, the initial nitrobenzene concentration is 500mg/L, the catalyst dosage is 0.2g/L, and light intensity exceeds 2000| /cm2. A kinetic model is established based on the results. The relative errors of the kinetic constants obtained by the model are between -16.5% and approximately -4.5% with low initial nitrobenzene concentrations, and between -11.3% and approximately 4.6% with high initial concentrations.

ZHANG Shu-lin,XIA Bin,LI Xu-xuan,

天然气地球科学 , 2004,
Abstract: The four components seismic acquisition technology is mature.Four components seismic is useful to solve some key exploration problems of Chinese offshore.It was four years for China to have imported this technology.The researchers who work for CNOOC(China national offshore oil company) did research for 4C data processing and interpretation.CNOOC did test in Ynggehai basin.The foreign oil companys acquisited 3D four components seismic data in Penglai 19-3 oil field in Bohai basin and get 2D data in Yacheng 13-1 gas field in Qiongdongnan in 2000.In a word,it is effective to solve "gas chimney" imaging,small fault and low range structure identifying, lithology and shallow gas reservoir predicting. 4C can be used to predict anisotropy. It is nesssery for China to invest more money, and strengthen research. Now, although 4C is not perfect enough, we believe its future must be good. I foretell the present longitudinal wave exploration must be insteaded by 4C in the future.So, I appeal Chinese men of insight should give 4C more attention and care.
Molecular dynamic of selectivity and permeation based on deformed carbon nanotube
Xu Kui,Wang Qing-Song,Tan Bin,Chen Ming-Xuan,Miao Ling,Jiang Jian-Jun
Physics , 2012,
Abstract: Extensive molecular dynamics simulations of water permeation and ion selectivity of the single-walled carbon nanotubes with the radial deformation are presented . The simulated results indicate that there is a close relationship between the minor axis of deformed carbon nanotubes and the variety, density as well as the position of functional groups. The critical minor axis of different diameter carbon nanotubes exists, and the carbon nanotube whose minor axis is less than the critical minor axis owns the selectivity of chlorine and sodium ions. Meanwhile, compared with intrinsic carbon nanotubes, the deformed nanotubes have not obviously decreased the permeation of water. The analysis to the potential of mean force reveals that the selectivity and permeation of ions comes from the pass potential barrier of carbon nanotubes with various minor axises. Furthermore, our observations of modifying with functional groups may have significance for controlling the minor axis and improving the selectivity and permeation of ions, when it comes to some large nanotube in real manufacture.
Association of Fcγ Receptor IIB Polymorphism with Cryptococcal Meningitis in HIV-Uninfected Chinese Patients
Xiu-Ping Hu, Ji-Qin Wu, Li-Ping Zhu, Xuan Wang, Bin Xu, Rui-Ying Wang, Xue-Ting Ou, Xin-Hua Weng
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0042439
Abstract: Background As important regulators of the immune system, the human Fcγ receptors (FcγRs) have been demonstrated to play important roles in the pathogenesis of various infectious diseases. The aim of the present study was to identify the association between FCGR polymorphisms and cryptococcal meningitis. Methodology/Principal Findings In this case control genetic association study, we genotyped four functional polymorphisms in low-affinity FcγRs, including FCGR2A 131H/R, FCGR3A 158F/V, FCGR3B NA1/NA2, and FCGR2B 232I/T, in 117 patients with cryptococcal meningitis and 190 healthy controls by multiplex SNaPshot technology. Among the 117 patients with cryptococcal meningitis, 59 had predisposing factors. In patients with cryptococcal meningitis, the FCGR2B 232I/I genotype was over-presented (OR = 1.652, 95% CI [1.02–2.67]; P = 0.039) and the FCGR2B 232I/T genotype was under-presented (OR = 0.542, 95% CI [0.33–0.90]; P = 0.016) in comparison with control group. In cryptococcal meningitis patients without predisposing factors, FCGR2B 232I/I genotype was also more frequently detected (OR = 1.958, 95% CI [1.05–3.66]; P = 0.033), and the FCGR2B 232I/T genotype was also less frequently detected (OR = 0.467, 95% CI [0.24–0.91]; P = 0.023) than in controls. No significant difference was found among FCGR2A 131H/R, FCGR3A 158F/V, and FCGR3B NA1/NA2 genotype frequencies between patients and controls. Conclusion/Significance We found for the first time associations between cryptococcal meningitis and FCGR2B 232I/T genotypes, which suggested that FcγRIIB might play an important role in the central nervous system infection by Cryptococcus in HIV-uninfected individuals.
Nitric Oxide Mediates Stretch-Induced Ca2+ Release via Activation of Phosphatidylinositol 3-Kinase-Akt Pathway in Smooth Muscle
Bin Wei, Zheng Chen, Xu Zhang, Morris Feldman, Xian-zhi Dong, Robert Doran, Bao-Lu Zhao, Wen-xuan Yin, Michael I. Kotlikoff, Guangju Ji
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0002526
Abstract: Background Hollow smooth muscle organs such as the bladder undergo significant changes in wall tension associated with filling and distension, with attendant changes in muscle tone. Our previous study indicated that stretch induces Ca2+ release occurs in the form of Ca2+ sparks and Ca2+ waves in urinary bladder myocytes. While, the mechanism underlying stretch-induced Ca2+ release in smooth muscle is unknown. Methodology/Principal Findings We examined the transduction mechanism linking cell stretch to Ca2+ release. The probability and frequency of Ca2+ sparks induced by stretch were closely related to the extent of cell extension and the time that the stretch was maintained. Experiments in tissues and single myocytes indicated that mechanical stretch significantly increases the production of nitric oxide (NO) and the amplitude and duration of muscle contraction. Stretch- induced Ca2+ sparks and contractility increases were abrogated by the NO inhibitor L-NAME and were also absent in eNOS knockout mice. Furthermore, exposure of eNOS null mice to exogenously generated NO induced Ca2+ sparks. The soluble guanylyl cyclase inhibitor ODQ did not inhibit SICR, but this process was effectively blocked by the PI3 kinase inhibitors LY494002 and wortmannin; the phosphorylation of Akt and eNOS were up-regulated by 204±28.6% and 258±36.8% by stretch, respectively. Moreover, stretch significantly increased the eNOS protein expression level. Conclusions/Significance Taking together, these results suggest that stretch-induced Ca2+ release is NO dependent, resulting from the activation of PI3K/Akt pathway in smooth muscle.
Gene Cloning, Soluble Expression and Activity Analysis of rSEA

Quan-Bin Xu,Chuan-Xuan Liu,Qing-Jun Ma,

生物工程学报 , 2003,
Abstract: The superantigen,such as staphylococcal enterotoxins, had been identified as possible anti-cancer molecules in many reports. In this paper, we cloned the entA gene encoding Staphylococcal enterotoxin A from the genomic DNA of Staphylococcus aureus(ATCC13565) by PCR, the sequence cloned was accordance with that reported in Genebank. The entA gene could be expressed effectively after inserted into plasmid pET-22b( + ), The rSEA was expressed as inclusion bodies when induced by IPTG at 37 degrees C and became soluble after induced at low temperature, the soluble part is about 55% of total rSEA products. Only one band was detected by western-blotting in expression product of BL-21 (DE3) with pET-SEA. The soluble rSEA was purified by Ni2+ chelating sepharose column. No other protein except rSEA was seen in SDS-PAGE gel stained by both Coomassie brilliant blue and silver salt, which showed that the rSEA was purified effectively. Homology modeling of rSEA determined the structure change was conducted, which indicated there was no apparent structure change between rSEA and native SEA. This result was also confirmed by proliferation assay of PBMC, for the rSEA could induced proliferation of PBMC as effectively as native SEA. The increasing anti-tumor activity of rSEA was also detected after the spleen cell activated in vivo by rSEA, which was accordance with others reports. This work paved the way for the further study of anti-cancer with rSEA.
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