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Search Results: 1 - 10 of 33213 matches for " Xin Fan "
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Effects of main range and strength factors on change of COD in a shallow lake 
Fan,Cheng,xin
环境科学学报(英文版) , 1998,
Abstract: EfectsofmainrangeandstrengthfactorsonchangeofCODinashalowlakeFanChengxinNanjingInstituteofGeographyandLimnology,ChineseAcad...
The Design of Oil Port Accident Exercise Experiment System Based on Virtual Environment
Xin Cao,Shidong Fan
Modern Applied Science , 2009, DOI: 10.5539/mas.v3n1p7
Abstract: Taking large scale equipments of oil storage and transportation port as research objects, in this article, we establish the oil port accident exercise experiment system under the virtual environment, which mainly includes the visual modeling construction of oil port equipment, the virtual equipment accident reasoning system and the reliability evaluation and safety evaluation system of oil equipment, in order to realize the accident reasoning, simulation, demonstration, and danger and reliability evaluation of oil equipments under the virtual environment.
The Design and Realization on Effectively Fire Tower Planning Based on MapGIS-TDE  [PDF]
Wenyou FAN, Xin MENG, Xiaojing LIU, Niaoniao HU
Journal of Geographic Information System (JGIS) , 2010, DOI: 10.4236/jgis.2010.21010
Abstract: Fire-tower is effectively applied in forest fire prevention and commanding system, especially in fire monitor and position. After explaining the significance of scientific planning of fire-tower, this paper analyzes GIS`s functions in building forest fire prevention system. This paper uses case study method, which designs a model, fire tower planning and analysis, based on MapGIS platform. After that, it directs us how to realize these functions based on MapGIS-TDE which is a 3D platform belonged to MapGIS. This paper gives us scientific ways to fire tower planning in forest fire system which promotes informationization of forest fire prevention management.
An Electrically Scanned Lens Antenna for 2-D Scanning  [PDF]
Zong-Xin Wang, Da-Peng Fan
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.32013
Abstract: An electrically scanned lens antenna for two dimensional scanning is presented. The antenna system is composed of a (N × 1) feed array, a binary diffractive dielectric lens (BDL) and a voltage-controlled ferroelectric lens (VCFL). The feeds at different offset foci of the BDL generate receiving beams pointing to different angles to perform beam scanning in one dimension; the VCFL made of ferroelectric slabs which show linear permittivity gradient when loaded with corresponding DC voltages generate linear phase shift to steer the beam in the other dimension.
Synthesis and Characterization of APG-12  [PDF]
Jigang Wang, Yongle Xin, Danting Fan, Sitong Chen
Open Journal of Composite Materials (OJCM) , 2015, DOI: 10.4236/ojcm.2015.51003
Abstract: APG-12 was synthesized from n-dodecyl alcohol and glucose in catalysis system of p-Toluenesulfonic and phosphoric acid. Using the method of direct glycosidation, this paper discusses the impact of raw material ratio, catalyst dosage and reaction temperature on the synthesis. It is concluded that the synthesis of APG-12 best reaction process condition is the molar ratio of alcohol and glucose 7:1; the reaction temperature is 115 and the amount of catalyst is 1.3%, controlling the reaction pressure in 3 - 4 kPa. The resulting products are analyzed by infrared spectroscopy.
New Insight into the Graphene Based Films Prepared from Carbon Fibers  [PDF]
Yan-Xiang Wang, Wen-Xin Fan, Guo-Li Wang, Min-Xia Ji
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27113
Abstract: In this work, ultrathin sections from longitudinal polyacrylonitrile (PAN) based T700 and T300 carbon fibers were prepared by ultramicrotomy, a promising graphene based thin films were developed in one step at ambient temperature. It is investigated that the network-graphene planes composed with carbon atoms are partly straight and partly twisted in the thin films prepared from T700 carbon fibers, the distance between the carbon atoms of network-graphene plane decreases, the order design of graphene in the films prepared from T700 carbon fibers is denser and its arrangement shows a preferred orientation along the drawing direction, its consistency of the neighboring graphene based planes is better, moreover, the relative content of the forming SP2-hybridized orbit of carbon atoms in the films prepared from T700 carbon fibers is higher, in the other words, the fact of the graphene based film prepared from carbon fibers without having the characteristic of skin-core structure has been verified.
SH-2-containing protein tyrosine phosphatase 1 is required for IL-4-induced IL-4R expression in spleen cells
Xin Cao,Zan Huang,Jingyi Fan
Chinese Science Bulletin , 2005, DOI: 10.1360/982005-647
Abstract: To investigate the role of SH-2-containing protein tyrosine phosphatase 1, SHP-1, in IL-4-induced IL-4 receptor (IL-4R) expression, we examined IL-4 receptor α-chain (IL-4Rα) mRNA expression in Na3VO4-treated wild type (WT) spleen cells and measured IL-4R mRNA in IL-4-stimulated spleen cells of viable motheaten mice (me v/mev). It is found that IL-4-induced IL-4R mRNA expression was impaired in Na3VO4-treated WT spleen cells and IL-4-stimulated me v/mev spleen cells. Here we show that the impaired IL-4-induced IL-4Rα mRNA expression was due to reduced expression of IL-4R that led to impaired STAT6 signaling. We further demonstrate that reduction of IL-4Rα protein expression in me v/mev spleen cells was due to alteration in cell compositions. In me v/mev spleen, the percentages of CD4+, CD8+, and CD19+ cells expressing relatively high levels of IL-4R were reduced dramatically while the percentages of Mac-1+ and Gr-1+ cells with relative low levels of IL-4R increased greatly. Despite the profound effect of reduced expression of IL-4R protein, the IL-4Rα mRNA expression was comparable in spleen cells of littermate control mice (+/-) and me v/mev mice and no differences were found in B cells, T cells, and macrophages, suggesting cell type-specific downregulation of IL-4R expression in macrophages through a posttranscriptional mechanism. Our study suggests that SHP-1 is required for IL-4-meidated function and indirectly regulates IL-4-meidated function in spleen cells by affecting hematopoiesis.
Identification of the kinetic mechanism of succinyl-CoA synthetase
Xin Li,Fan Wu,Daniel?A. Beard
Bioscience Reports , 2013, DOI: 10.1042/bsr20120069
Abstract: The kinetic mechanism of SCS [succinyl-CoA (coenzyme A) synthetase], which participates in the TCA (tricarboxylic acid) cycle, ketone body metabolism and haem biosynthesis, has not been fully characterized. Namely, a representative catalytic mechanism and associated kinetic parameters that can explain data on the enzyme-catalysed reaction kinetics have not been established. To determine an accurate model, a set of putative mechanisms of SCS, proposed by previous researchers, were tested against experimental data (from previous publication) on SCS derived from porcine myocardium. Based on comparisons between model simulation and the experimental data, an ordered ter–ter mechanism with dead-end product inhibition of succinate against succinyl-CoA is determined to be the best candidate mechanism. A thermodynamically constrained set of parameter values is identified for this candidate mechanism.
Performance Guarantees for Distributed Reachability Queries
Wenfei Fan,Xin Wang,Yinghui Wu
Computer Science , 2012,
Abstract: In the real world a graph is often fragmented and distributed across different sites. This highlights the need for evaluating queries on distributed graphs. This paper proposes distributed evaluation algorithms for three classes of queries: reachability for determining whether one node can reach another, bounded reachability for deciding whether there exists a path of a bounded length between a pair of nodes, and regular reachability for checking whether there exists a path connecting two nodes such that the node labels on the path form a string in a given regular expression. We develop these algorithms based on partial evaluation, to explore parallel computation. When evaluating a query Q on a distributed graph G, we show that these algorithms possess the following performance guarantees, no matter how G is fragmented and distributed: (1) each site is visited only once; (2) the total network traffic is determined by the size of Q and the fragmentation of G, independent of the size of G; and (3) the response time is decided by the largest fragment of G rather than the entire G. In addition, we show that these algorithms can be readily implemented in the MapReduce framework. Using synthetic and real-life data, we experimentally verify that these algorithms are scalable on large graphs, regardless of how the graphs are distributed.
Communication Learning in Social Networks: Finite Population and the Rates
Jianqing Fan,Xin Tong,Yao Zeng
Computer Science , 2012,
Abstract: Following the Bayesian communication learning paradigm, we propose a finite population learning concept to capture the level of information aggregation in any given network, where agents are allowed to communicate with neighbors repeatedly before making a single decision. This concept helps determine the occurrence of effective information aggregation in a finite network and reveals explicit interplays among parameters. It also enables meaningful comparative statics regarding the effectiveness of information aggregation in networks. Moreover, it offers a solid foundation to address, with a new perfect learning concept, long run dynamics of learning behavior and the associated learning rates as population diverges. Our conditions for the occurrence of finite population learning and perfect learning in communication networks are very tractable and transparent.
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