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Search Results: 1 - 10 of 120154 matches for " Dongxue Wang "
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Verification of Mongolian Cyclone-Induced Snowstorm Model Forecast in Jilin Province, China  [PDF]
Dongxue Fu, Xueyan Yang, Ning Wang, Yao Yao
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.58003
Abstract: Situation field forecast and rainfall forecast in typical numerical forecast models including EC (The European Centre for Medium-Range Weather Forecasts), t639 (T639 Global Forecast System) and Japanese model were verified by set statistics and TS (Threat Score) scoring based on 8 cases of Mongolian cyclone-induced snowstorm in Jilin Province in this paper. As shown by the results, for the forecast of Mongolian cyclone location and intensity, EC has significantly higher accuracy than Japanese model and t639, and there is a high likelihood that it forecasts the southerly cyclone location, relatively fast movement and comparatively weak intensity within 72 hours; for snowfall forecast, Japanese model shows significantly higher accuracy than other models, especially it has obviously stronger ability to forecast the heavy rainfall above snowstorm than other models, while WRF model (The Weather Research and Forecasting Model) has strong forecast ability of normal snowfall; for normal snowfall, the 72-hour missing forecast rate is higher than false forecast rate in all the models.
Design and Simulation of a Fused Silica Space Cell Culture and Observation Cavity with Microfluidic and Temperature Controlling
Shangchun Fan,Jinhao Sun,Weiwei Xing,Cheng Li,Dongxue Wang
Journal of Applied Mathematics , 2013, DOI: 10.1155/2013/378253
Abstract: We report a principle prototype of space animal cell perfusion culture and observation. Unlike previous work, our cell culture system cannot only realize microfluidic and temperature controlling, automatic observation, and recording but also meet an increasing cell culture at large scale operation and overcome shear force for animal cells. A key component in the system is ingenious structural fused silica cell culture cavity with the wedge-shaped connection. Finite volume method (FVM) is applied to calculate its multipoint flow field, pressure field, axial velocity, tangential velocity, and radial velocity. In order to provide appropriate flow rate, temperature, and shear force for space animal cell culture, a closed-loop microfluidic circuit and proportional, integrating, and differentiation (PID) algorithm are employed. This paper also illustrates system architecture and operating method of the principle prototype. The dynamic culture, autofocus observation, and recording of M763 cells are performed successfully within 72?h in the laboratory environment. This research can provide a reference for space flight mission that carries an apparatus with similar functions. 1. Introduction The increasing demand of recombinant therapeutic proteins, monoclonal antibodies, and vaccines produced by mammalian cells has stimulated the development of space cell culture technology, for which almost all space powers have a huge interest. In order to make an in-depth research of space cell culture characteristics, some space powers have developed various space cell culture devices [1–4]. Many of these have completed space flight mission that are shown in Table 1 and Figure 1. Such space cell culture apparatus not only provides appropriate temperature, adequate nutrition and oxygen, low concentration of toxic secretions, and reasonable mechanical property but also records details of cell proliferation [5]. However, space perfusion cultures require more efficient and advanced system, the most frequently reported based on microfluidic chip with kinds of sensors [6–10] and aerospace heat transfer [11]. Rotating wall bioreactor is widely used because the internal spin-filters are conducive to perfusion rates and reproductive rate at large-scale operation [12, 13]. In this case, the defects such as high energy consumption, noise, low space utilization, and shear force have been considered as limitation of culture duration and process performance. Table 1: Space cell culture instruments development at home and abroad. Figure 1: Successful applications of space cell culture
Improved CoSaMP Reconstruction Algorithm Based on Residual Update  [PDF]
Dongxue Lu, Guiling Sun, Zhouzhou Li, Shijie Wang
Journal of Computer and Communications (JCC) , 2019, DOI: 10.4236/jcc.2019.76002
Abstract: A large number of sparse signal reconstruction algorithms have been continuously proposed, but almost all greedy algorithms add a fixed number of indices to the support set in each iteration. Although the mechanism of selecting the fixed number of indexes improves the reconstruction efficiency, it also brings the problem of low index selection accuracy. Based on the full study of the theory of compressed sensing, we propose a dynamic indexes selection strategy based on residual update to improve the performance of the compressed sampling matching pursuit algorithm (CoSaMP). As an extension of CoSaMP algorithm, the proposed algorithm adopts a residual comparison strategy to improve the accuracy of backtracking selected indexes. This backtracking strategy can efficiently select backtracking indexes. And without increasing the computational complexity, the proposed improvement algorithm has a higher exact reconstruction rate and peak signal to noise ratio (PSNR). Simulation results demonstrate the proposed algorithm significantly outperforms the CoSaMP for image recovery and one-dimensional signal.
Mitochondria-Localized Glutamic Acid-Rich Protein (MGARP) Gene Transcription Is Regulated by Sp1
Da Jin, Rui Li, Dongxue Mao, Nan Luo, Yifeng Wang, Shaoyong Chen, Shuping Zhang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050053
Abstract: Background Mitochondria-localized glutamic acid-rich protein (MGARP) is a novel mitochondrial transmembrane protein expressed mainly in steroidogenic tissues and in the visual system. Previous studies showed that MGARP functions in hormone biosynthesis and its expression is modulated by the HPG axis. Methodology/Principal Findings By bioinformatics, we identified two characteristic GC-rich motifs that are located proximal to the transcription start site (TSS) of MGARP, and each contains two Specificity protein 1 (Sp1) binding elements. We then determined that the ?3 kb proximal MGARP promoter is activated in a Sp1-dependent manner using reporter assays and knockdown of Sp1 led to decreased expression of endogenous MGARP messages. We also demonstrated that one of the two GC-rich motifs, GC-Box1, harbors prominent promoter activity mediated by Sp1, and that it requires both GC boxes for full transcriptional activation. These findings suggest a dominant role for these GC boxes and Sp1 in activating the MGARP promoter through a synergistic mechanism. Consistently, the results of an Electrophoretic Mobility Gel Shift Assay (EMSA) and Chromatin Immunoprecipitation (ChIP) confirmed that Sp1 specifically interacts with the GC-rich region. We further found that estrogen receptor α (ERα), a known Sp1 co-activator, could potentiate GC-boxes containing MGARP promoter activity and this effect is mediated by Sp1. Knockdown of Sp1 significantly diminished the MGARP promoter transactivation and the expression of endogenous MGARP mediated by both Sp1 and ERα. Conclusions/Significance The present study identified a proximal core sequence in the MGARP promoter that is composed of two enriched Sp1 binding motifs and established Sp1 as one major MGARP transactivator whose functions are synergistic with ERα, providing a novel understanding of the mechanisms of MGARP gene transcriptional regulation.
Nanotechnology in Textiles Finishment
Dongxue Liu,Weiguo Dong
Modern Applied Science , 2009, DOI: 10.5539/mas.v3n2p154
Abstract: The ways of using the nanometer material to give the textile fabric some function is listed and compared in this article. In the early research, first the nanometer material preparation is alone carries on. And then using this to make the finishing agent. Finally put the agent on the fabric by finishment. At present, people combine the preparation of nanometer material and finishing agent together, and then cover this on fabric through the normal finishment. Recentlly research the trend is to compact the three steps to one step, completing the nanometer material preparation, the finishment agent production and the finishing process at the time. Various examples are given in this artile. At the end, some reserches about cotton fiber hole structure are listed, which has implicited a new way to take advantage of nanometer merterial and a bright future about a new type cotton fiber.
Optimization of Fermentation Conditions and Properties of an Exopolysaccharide from Klebsiella sp. H-207 and Application in Adsorption of Hexavalent Chromium
Li Qiang, Li Yumei, Han Sheng, Liu Yingzi, Song Dongxue, Hao Dake, Wang Jiajia, Qu Yanhong, Zheng Yuxia
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0053542
Abstract: The novel exopolysaccharide HZ-7 is produced by Klebsiella sp. H-207, and its fermentation conditions were optimized by response surface methodology (RSM). In this study, the optimized medium consisted of sucrose 31.93 g/L, KNO3 2.17 g/L and K2HPO4 5.47 g/L; while the optimized culture conditions consisted of seed age 13 h, with an inoculum size of 10.6% and incubation temperature of 28.9°C. A maximum HZ-7 yield of about 15.05 g/L was achieved under the optimized conditions using RSM and single-factor experiments. Next the exopolysaccharide HZ-7 was partially purified and characterized. The resulting product showed good properties, such as high concentration of uronic acid (41.67%), low average molecular weight (about 1.94×105 Da) and porous surface structure, were very advantageous to biosorption. Therefore HZ-7 was applied to absorb hexavalent chromium (Cr(VI)). The maximum adsorption efficiency (99.2%) which was obtained at an initial pH of 1.0 along with an initial Cr(VI) concentration of 20 mg/L, was not affected by ordinary metal ions and temperature. These data suggest Klebsiella sp. H-207 exopolysaccharide will be promising potential for industrial application.
Study on water environment characteristics of an incipient artificial lake
某人工湖成库初期水环境特征研究

Zhang Zhi,Yang Dongxue,Wang Bin,Fang Xiaoxian,Wang Lingli,
张智
,杨冬雪,王斌,方晓先,汪玲丽

环境工程学报 , 2010,
Abstract: 通过对某新建人工湖水温、DO、SD、pH、TN、TP、CODMn、Chla、藻类和水动力条件10项环境因素的特征、趋势分析,研究人工湖成库初期水环境特征。实验结果表明,成库初期,TN、TP等营养盐处于累积高峰期,通过计算N/P比和相关性分析,磷为藻类生长时期的限制性因子;人工湖基本处于准静止状态(流速小于0.1 m/s),为藻类生长提供有利条件;人工湖藻类种类和密度随时间而变动,出现高峰值,在调查阶段主要藻种为蓝、绿藻;叶绿素a含量一直处于较高水平,并分别与TP、SD、pH、DO之间存在显著的相关性。
8b,8c-Diphenyl-2,6-bis(4-pyridylmethyl)perhydro-2,3a,4a,6,7a,8a-hexaazacyclopenta[def]fluorene-4,8-dithione chloroform solvate
Cong Deng,Wenming Shu,Dongxue Zhang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810020040
Abstract: In the thioglycoluril system of the title compound, C32H30N8S2·CHCl3, the two pyridine rings are roughly parallel, forming a dihedral angle of 7.2 (1)°, and the distance between the centroids of the two phenyl rings is 3.951 (5) . The chloroform solvent molecule is linked to the main molecule via a weak C—H...N hydrogen bond.
Methyl 3-(4-chlorophenyl)-2-(1,3-dimethyl-2,5-dioxo-4-phenylimidazolidin-4-yl)-3-oxopropanoate
Dongxue Zhang,Cong Deng,Yan Yang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811018733
Abstract: The title compound, C21H19ClN2O5, is a tetrasubstituted hydantoin derivative which contains an imidazolidine-2,4-dione core. The dihedral angle between the aromatic rings is 64.53 (14)°. In the crystal, weak intermolecular C—H...O hydrogen bonding is found. An intramolecular C—H...O interaction also occurs.
Testing and Analysis of Pulse Detection Circuits Based on the Concept of Chinese Medicine
Xinsheng Che,Xiaoxue Gu,Dongxue Fan,Hui Xu
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: In order to get real pulse information and research pulse instrument by using Chinese medicine, a method about testing pulse detection circuits is proposed by use of the definition of Chinese medicine pulse in this study and detection circuits from three different pulse instruments are analyzed using this method. The existence of distortion in circuits is proved by using electronic circuit simulation and hardware circuit experiments. At the same time, the quantified distortion errors of three pulse detection circuits are given according to describing the pulse parameters of Chinese medicine. These pulse parameters and data can be used to optimize the pulse detection circuits.
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