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Search Results: 1 - 10 of 18914 matches for " Shangwei Song "
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The Optimization and Improvement of MapReduce in Web Data Mining  [PDF]
Jun Qu, Chang-Qing Yin, Shangwei Song
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.88039
Abstract: Extracting and mining social networks information from massive Web data is of both theoretical and practical significance. However, one of definite features of this task was a large scale data processing, which remained to be a great challenge that would be addressed. MapReduce is a kind of distributed programming model. Just through the implementation of map and reduce those two functions, the distributed tasks can work well. Nevertheless, this model does not directly support heterogeneous datasets processing, while heterogeneous datasets are common in Web. This article proposes a new framework which improves original MapReduce framework into a new one called Map-Reduce-Merge. It adds merge phase that can efficiently solve the problems of heterogeneous data processing. At the same time, some works of optimization and improvement are done based on the features of Web data.
Contrasting Drought Tolerance in Two Apple Cultivars Associated with Difference in Leaf Morphology and Anatomy  [PDF]
Tuanhui Bai, Zhanying Li, Chunhui Song, Shangwei Song, Jian Jiao, Yuchen Liu, Zhidan Dong, Xianbo Zheng
American Journal of Plant Sciences (AJPS) , 2019, DOI: 10.4236/ajps.2019.105051
Abstract: Apple is one of the most important fruit trees in temperate zones, and is cultivated widely throughout the world. Drought stress affects the normal growth of apple tree, and further affects fruit yield and quality. The present study examined the effects of drought on photosynthesis and water use efficiency (WUE) of two apple cultivars (Honeycrisp and Yanfu 3) that differ in drought tolerance. The results showed that the photosynthetic rate decreased in response to drought stress for both cultivars, with significant differences in intensity. Values for net photosynthetic rate (Pn) in stressed Yanfu 3 remained significantly lower than in the controls, while, for Honeycrisp, only a slight drop in photosynthesis. Similarly, stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr) were markedly reduced in Yanfu 3 under drought stress. However, Honeycrisp showed only minor changes. Under drought stress, the contents of Chl a, Chl b and Chl t in Yanfu 3 were all decreased significantly compared with the control. However, little difference in Honeycrisp was noted between stressed plants and controls. Values for WUE in stressed Yanfu 3 remained higher than in the controls from day 3 until the end of the experiment, while no significant difference was observed in Honeycrisp. Furthermore, Honeycrisp also exhibited superior physiological traits, as indicated by its anatomical and morphological characteristics. Therefore, we conclude that the superior drought tolerance of Honeycrisp was due to its anatomical and morphological characteristics, which possibly contributed to the maintenance of higher photosynthetic capacity than Yanfu 3.
一阶柯西问题的 Lp最大正则性特征
Characterizations of Lp-maximal regularity for first order Cauchy problems

WU Shangwei
,SONG Xiaoqiu,ZHANG Wandi

- , 2018,
Abstract: 首先介绍了一阶柯西问题的 Lp最大正则性的概念.在二阶问题的基础上,创新使用了不同于传统的研究一阶初值问题的存在性、唯一性以及正则性的方法.此外,证明了非齐次柯西问题的 Lp最大正则性与 T和p的选取无关.
Reflection the Evaluation of Basic Education in China
Shangwei LI,Danping PENG
Cross-Cultural Communication , 2012, DOI: 10.3968/j.ccc.1923670020120806.1477
Abstract: Evaluation of basic education is to evaluate its quality, which ought to be fundamental, humanistic, just and developmental. At present, because of some unhealthy trends during evaluate the basic education, such as absolutization, leadership-based, subjectivism and utilitarianism, it is necessary to reflect and seek the future of basic education’s evaluation in China. Key words: Basic education; Evaluation; Orientation
Study on the Retention Behaviors and Analytical Methods of Polysaccharides from Duanaliella salina by High Performance Size-Exclusion Chromatography

DAI Jun,YIN Hongping,CHEN Shangwei,ZHU Song,GU Xiaohong,WANG Min,TANG Jian,

色谱 , 2006,
Abstract: There are many polysaccharides with biological activities including anti-virus and anti-tumor in the residue produced by the extraction of beta-carotene from Duanaliella salina. In this paper, a method of high performance size-exclusion chromatography coupled with refractive index detection has been developed for the relative molecular mass analysis of the polysaccharides isolated from the residue. The effects of salt and pH values of mobile phase on retention behaviors of five polysaccharides fractions were investigated on two HPSEC columns (Waters Ultrahydragel Linear, 7.8 mm i. d. x 300 mm) connected in series. The results showed that 0. 1 mol/L NaAc buffer solution may be utilized as mobile phase during HPSEC under the conditions of column temperature of 45 degrees C and flow rate of 0.9 mL/min to minimize nonspecific interaction of sulfated polysaccharides fraction (PD4a), complex carbohydrate containing oligonucleic acid (PD4b) and acidic polysaccharide fraction (PD1) with the column matrix. In addition, under the conditions the association effect of the polysaccharide molecules was eliminated. Thereby, the polysaccharide molecules were eluted and separated following equilibrium exclusion mechanism mainly. The weight mean molecular masses (M(w)) of five polysaccharide fractions from D. salina determined under optimum chromatographic conditions were 1 548 000 for PD1, 33 000 for PD2, 67 000 for PD3, 424 000 for PD4a and 10 000 for PD4b. For sulfated polysaccharide fraction PD4a, the relative standard deviations were 1.7% and 0.88% for M(w) and peak area, respectively.
Analysis of Monosaccharides and Uronic Acids in Polysaccharides by Pre-column Derivatization with p-Aminobenzoic Acid and High Performance Liquid Chromatography
氨基苯甲酸衍生化高效液相色谱法 分析多糖中的单糖及糖醛酸组成

HAO Guitang,CHEN Shangwei,ZHU Song,YIN Hongping,DAI Jun,CAO Yuhua,

色谱 , 2007,
Abstract: An ion-pair reversed-phase high performance liquid chromatographic (RP-HPLC) method for the simultaneous determination of carbohydrate and uronic acids was developed. p-Aminobenzoic acid (p-AMBA) was used for pre-column derivatization of the analytes, enabling fluorescence (lambda(ex) = 313 nm, lambda(em) = 358 nm) or ultraviolet (UV at 303 nm) detection. Reaction conditions such as reaction temperature and reaction time were optimized. Atlantis dC18 column with hydrophilic end capping was selected for the separation of derivatives. Effects of mobile phase compositions such as ion pairs and their concentrations and pH on the retention behaviors and separation results of 9 monosaccharides and 2 uronic acids were investigated. Derivatives of fructose, galactose, glucose, mannose, xylose, arabinose, ribose, galacturonic acid, fucose, glucuronic acid and rhamnose were separated within 42 min, applying tetrabutyl ammonium hydrogen bisulfate (TBAHSO4) as the ion pair reagent. The detection limits were between 3.38 x 10(-8) mol/L and 176 x 10(-8) mol/L for fluorescence detection and between 2.55 x 10(-7) mol/L and 13.4 x 10(-7) mol/L for UV detection. Good linearities were obtained with correlation coefficients (r2) above 0.99. The relative standard deviations (RSDs) of the peak area of the derivatives in 12 - 51 h after derivatization were from 2.5% to 3.9%. This method has been applied for the determination of mono-/disaccharides and uronic acids in spirulina polysaccharide after dissolved in trifluoroacetic acid solution (2 mol/L). The results showed this method is suitable for the analysis of monosaccharide compositions in polysaccharides.
Solution of a Class of Minimal Surface Problem with Obstacle
Kefei Liu,Shangwei Zhao,Meizhu Liu
Journal of Mathematics Research , 2009, DOI: 10.5539/jmr.v1n1p39
Abstract: Plateau’s problem is to determine the surface with minimal area that lies above an obstacle with given boundary conditions. In this paper, a special example of this class of the problem is given and solved with the linear finite element method. First, we triangulate the domain of definition, and transform the linear finite element approximation into a constrained nonlinear optimization problem. Then we introduce a simple and efficient method, named sequential quadratic programming, for solving the constrained nonlinear optimization problem. The sequential quadratic programming is implemented by the fmincon function in the optimization toolbox of MATLAB. Also, we discuss the relations between the number of grids and the computing time as well as the precision of the result.
On Functional Decomposition of Multivariate Polynomials with Differentiation and Homogenization
Shangwei Zhao,Ruyong Feng,Xiao-Shan Gao
Computer Science , 2010,
Abstract: In this paper, we give a theoretical analysis for the algorithms to compute functional decomposition for multivariate polynomials based on differentiation and homogenization which are proposed by Ye, Dai, Lam (1999) and Faug$\mu$ere, Perret (2006, 2008, 2009). We show that a degree proper functional decomposition for a set of randomly decomposable quartic homogenous polynomials can be computed using the algorithm with high probability. This solves a conjecture proposed by Ye, Dai, and Lam (1999). We also propose a conjecture such that the decomposition for a set of polynomials can be computed from that of its homogenization with high probability. Finally, we prove that the right decomposition factors for a set of polynomials can be computed from its right decomposition factor space. Combining these results together, we prove that the algorithm can compute a degree proper decomposition for a set of randomly decomposable quartic polynomials with probability one when the base field is of characteristic zero, and with probability close to one when the base field is a finite field with sufficiently large number under the assumption that the conjeture is correct.
Gonadotropin-Releasing Hormone for Preservation of Ovarian Function during Chemotherapy in Lymphoma Patients of Reproductive Age: A Summary Based on 434 Patients
Yaoyao Zhang, Zhun Xiao, Yan Wang, Shan Luo, Xiaohong Li, Shangwei Li
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0080444
Abstract: Background Gonadotropin-releasing hormone agonists (GnRHa) might play a role in preserving ovarian function in lymphoma patients by inhibiting chemotherapy-induced ovarian follicular damage. However, studies of its clinical efficacy have reported conflicting results. Method We conducted a meta-analysis to determine the effect of the preservation of ovarian function by administering GnRHa in young patients with lymphoma undergoing chemotherapy. Seven studies were identified that met inclusion criteria and comprised 434 patients assigned to GnRHa combined chemotherapy or chemotherapy alone. Results The incidence of women with premature ovarian failure (POF) demonstrated a statistically significant difference in favor of the use of GnRHa (OR=0.32, 95% CI 0.13-0.77). In addition, the final level of FSH in the GnRH group was significantly lower than control group. (MD= -11.73, 95% CI,-22.25- -1.20), and the final level of AMH in the GnRH group was significantly higher than control group (MD=0.80; 95% CI, 0.61–0.98). However, there was no statistically significant difference between treatment and the control groups in the incidence of a spontaneous pregnancy (OR=1.11; 95% CI, 0.55–2.26). Conclusion This meta-analysis suggests that GnRHa may be effective in protecting ovarian function during chemotherapy in lymphoma patients. More well-designed prospective studies are needed to carry out for further understanding of this topic.
Determination of Total Germanium in Chinese Herbal Remedies by Square-Wave Catalytic Adsorptive Cathodic Stripping Voltammetry at an Improved Bismuth Film Electrode
Shangwei Zhong,Jiali Su,Liang Chen,Jiefeng Tong,Wenfang Jia,Xiangjun Li,Hong Zou
International Journal of Electrochemistry , 2013, DOI: 10.1155/2013/735019
Abstract: A catalytic adsorptive cathodic stripping voltammetric method on an improved bismuth film electrode (BiFE) for the determination of trace germanium in the presence of pyrogallol has been investigated. A well-defined and sensitive stripping peak of Ge(IV)-pyrogallol complex was observed at ?0.79?V (versus SCE) in a 0.1?M acetate buffer solution (pH 4.8) at a deposition potential of ?0.34?V. The reduction current is catalytically enhanced by adding KBrO3. The experimental variables and potential interference were studied. Compared with the BiFE plated in the solution prepared based on HAc-NaAc without trisodium citrate, the improved BiFE electrodeposited in the solution of HAc-NaAc containing trisodium citrate displayed a better electroanalytical performance for the determination of germanium(IV). Under the optimized conditions, the detection limit of Ge(IV) was 60?ng?L?1, and the relative standard deviation (RSD) was 3.73% at 5?μg?L?1 level ( ). This method was successfully applied to determine the total germanium in several Chinese herbal remedies. 1. Introduction Germanium is an essential trace element in human body and very important for our health. Either overaccumulation or deficiency of germanium could result in various diseases, such as acute renal failure [1]. Germanium compounds display a number of biological activities [2] and are described as antioxidants and immunostimulatory medicine that are used to inhibit the progress of cancer and destroy cancer cells [3]. Organogermanium compounds are considered to promote health and cure diseases [4]. Various analytical methods for determining the trace and ultratrace levels of germanium in medicine [4], food [5–7], water [8], and soil [5] have been reported, for example, inductively coupled plasma-mass spectrometry (ICP-MS) connected with solid phase extraction [4, 8] and combination of hydride generation [9], graphite furnace atomic absorption spectroscopy (GF AAS) [6, 10], the spectrophotometric method [11], the hydride generation atomic fluorescence spectrometry method [12], the luminol chemiluminescence flow method [13], and electrochemical methods [5, 7, 14–16]. Among these methods, electrochemical methods show obvious advantages in accuracy, sensitivity, simplicity, low cost, and analytical speed [7]. Adsorptive stripping voltammetry (AdSV) is well suited to determine the trace metal elements. The AdSV procedures developed for the determination of germanium were based on the adsorptive accumulation of a germanium complex on the hanging mercury drop electrode (HMDE) [5, 14–18] or the mercury film
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