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Search Results: 1 - 10 of 27837 matches for " Zhanxin Ma "
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A Data Envelopment Analysis based Research on the Economic Efficiency of Primary industry in Hohhot, Baotou and Ordos
Yuan Yuan,Ji Rimutu,Ma Shengyun,Ma Zhanxin
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: In this study, we analyze a data envelopment based research on the economic efficiency of primary industry in hohhot, baotou and ordos. The triangle Area of Hohhot, Baotou and Ordos leads the whole economic development in Inner Mongolia. The economic efficiency of primary industry of the county-level units in Hohhot. Baotou and Ordos is evaluated by the data envelopment analysis in this study. It is concluded that the metric value can show objectively the development of the primary industry in each county-level unit.
Grid Dependent Tasks Security Scheduling Model and DPSO Algorithm
Hai Zhu,Yuping Wang,Zhanxin Ma,Hecheng Li
Journal of Networks , 2011, DOI: 10.4304/jnw.6.6.850-857
Abstract: Due to the security threat to task scheduling problems in the grid environment, by considering both the inherent security and behavior safety of grid resource nodes, security benefit functions and credibility assessment strategies of grid resource nodes are constructed respectively. At the same time, the corresponding membership function is established in order to establish the membership between task security requirements and resource security attributes. Based on these, a new grid dependent tasks security scheduling model is set up. In order to solve this model, the particle evolution equation is re-designed by combining the specific characteristics of the dependent task scheduling problem. Meanwhile, in order to prevent the algorithm falling into local optimum, a uniform speed of disturbance is adopted and a new discrete Particle Swarm Optimization algorithm is proposed. Simulation results show that this algorithm has better scheduling length and higher safety performance than the genetic algorithm.
The Effect of Reducing Time on the Magnetoresistance of Manganite La0.67Sr0.20Cu0.10 0.03MnO3 at a Temperature of 30°C
Hongwei Zhao,Lichun Hu,Zhanxin Zhang
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/426037
Abstract: La0.67Sr0.20Cu0.10 0.03MnO3 (“ ” representing cation vacancy) polycrystalline manganite powder was synthesized by sol-gel method, which we used as parent materials. After reduced in hydrogen atmosphere for 30 and 60 minutes at a temperature of 400°C, the series bulk samples were obtained by sintering in argon atmosphere for 12 hours at 1100°C. The structure, electrical and magnetic properties, and colossal magnetoresistance of samples were researched in detail. Experiment results indicate that under an applied magnetic field of 1.8?T, the two bulk samples sintered in Ar atmosphere for 12 hours at 1100°C, with the powder reduced for 30 and 60 minutes in 400°C hydrogen atmosphere for La0.67Sr0.20Cu0.10 0.03MnO3 parent powders, respectively, have the stable MR (11.0?±?0.3)% and (10.0?±?0.5)% in temperature region from 270?K to 330?K. this is important for the potential application of this kind of magnetoresistance materials. 1. Introduction Manganite R1-xTxMnO3 with ABO3 perovskite structure, where R and T are rare earth and alkaline earth ions, respectively, has been extensively studied due to its abundant physics related to colossal magnetoresistance (CMR) and its potential application in magnetic devices [1–4]. In general, the MR magnitude of a perovskite manganite reaches the maximum only at the Curie temperature , which is beyond the room temperature region generally. And the MR changes abruptly with the temperature approaching the Curie temperature. These properties severely limit the practical applications of these materials [5–8]. Many researchers have thus been concentrated on making new material system that provides low-field magnetoresistance (LFMR) around room temperature. On the other hand, recent efforts to broaden the CMR temperature range have been made by means of the Mn-site substitution or oxygen deficiency [9–12]. Brando et al. [11] studied the dependence of oxygen deficiency on electrical and magnetic properties of La0.85Na0.15MnO3?δ ( ; 0.04; 0.10), they found that when the increased, the Curie temperature of the samples decreased. Liu et al. [12] studied the electrical properties and magnetoresistance effect and found that for La0.67Sr0.33MnO3, Sr-site substituted by Cu and leading to vacancy could both change the peak temperature (TMR) of MR to room temperature and improve the peak value of MR. In this paper, we chose La0.67Sr0.20Cu0.10 MnO3 as parent materials because its TMR is higher than room temperature, and its MR value is a little bigger. By means of reducing the powders in different temperature hydrogen atmosphere and
Pattern Recognition Method Based on Fuzzy Grey Incidence and Its Application
模糊灰关联模式识别方法及其应用

ZHAO Yanlin,MEI Zhanxin,
赵艳林
,梅占馨

系统工程理论与实践 , 1999,
Abstract: In this paper, a new theoretical model for the analysis of grey incidence is first set up,and then by combining it with fuzzy theory, a pattern recognition method based on fuzzy grey incidence is proposed. The effectiveness of the method proposed in this paper is demonstrated through its application to the assessment of site soil category.
Child-Na Score: A Predictive Model for Survival in Cirrhotic Patients with Symptomatic Portal Hypertension Treated with TIPS
Hui Chen, Ming Bai, Xingshun Qi, Lei Liu, Chuangye He, Zhanxin Yin, Daiming Fan, Guohong Han
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0079637
Abstract: Background and Aim Several models have been developed to predict survival in patients with cirrhosis undergoing TIPS; however, few of these models have gained widespread acceptance, especially in the era of covered stents. The aim of this study was to establish an evidence-based model for predicting survival after TIPS procedures. Methods A total of 210 patients with cirrhosis treated with TIPS were considered in the study. We comprehensively investigated factors associated with one-year survival and developed a new predictive model using the Cox regression model. Results In the multivariate analysis, the Child-Pugh score and serum sodium levels were independent predictors of one-year survival. A new score incorporating serum sodium into the Child-Pugh score was developed: Child-Na score. We compared the predictive accuracy of Child-Na score with that of other scores; only the Child-Na and MELD-Na scores had adequate predictive ability in patients with serum Na levels <138 mmol/L. The best Child-Na cut-off score (15.5) differentiated two groups of patients with distinct prognoses (one-year cumulative survival rates of 80.6% and 45.5%); this finding was confirmed in a validation cohort (n = 86). In a subgroup analysis stratifying patients by indication for TIPS, the Child-Na score distinguished patients with different prognoses. Conclusions Patients with variceal bleeding and a Child-Na score ≤15 had a better prognosis than patients with a score ≥16. Patients with refractory ascites and a Child-Na score ≥16 had a high risk of death after the TIPS procedures; caution should be used when treating these patients with TIPS.
The Equitable Total Chromatic Number of Some Join graphs  [PDF]
Gang MA, Ming MA
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B023
Abstract: A proper total-coloring of graph G is said to be?equitable if the number of elements (vertices and edges) in any?two color classes differ by at most one, which the required?minimum number of colors is called the equitable total chromatic?number. In this paper, we prove some theorems on equitable?total coloring and derive the equitable total chromatic numbers?of Pm V?Sn, Pm V?Fn and Pm V Wn.
Improvements and Generalizations of Stochastic Knapsack and Multi-Armed Bandit Approximation Algorithms: Full Version
Will Ma
Computer Science , 2013,
Abstract: The multi-armed bandit (MAB) problem features the classical tradeoff between exploration and exploitation. The input specifies several stochastic arms which evolve with each pull, and the goal is to maximize the expected reward after a fixed budget of pulls. The celebrated work of Gittins et al. [GGW89] presumes a condition on the arms called the martingale assumption. Recently, A. Gupta et al. obtained an LP-based 1/48-approximation for the problem with the martingale assumption removed [GKMR11]. We improve the algorithm to a 4/27-approximation, with simpler analysis. Our algorithm also generalizes to the case of MAB superprocesses with (stochastic) multi-period actions. This generalization captures the framework introduced by Guha and Munagala in [GM07a, GM07b], and yields new results for their budgeted learning problems. Also, we obtain a (1/2-eps)-approximation for the variant of MAB where preemption (playing an arm, switching to another arm, then coming back to the first arm) is not allowed. This contains the stochastic knapsack problem of Dean, Goemans, and Vondrak [DGV08] with correlated rewards, where we are given a knapsack of fixed size, a set of jobs each with a joint distribution for its size and reward, and the objective is to maximize expected reward before the knapsack size is exhausted. Our (1/2-eps)-approximation improves the 1/16 and 1/8 approximations of [GKMR11] for correlated stochastic knapsack with cancellation and no cancellation, respectively, providing the first tight algorithm for these problems that matches the integrality gap of 2. We sample probabilities from an exponential-sized dynamic programming solution, whose existence is guaranteed by an LP projection argument. We hope this technique can also be applied to other dynamic programming problems which can be projected down onto a small LP.
Liouville Type Theorems for Lichnerowicz Equations and Ginzburg-Landau Equation: Survey  [PDF]
Li Ma
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.13022
Abstract: In this survey paper, we firstly review some existence aspects of Lichnerowicz equation and Ginzburg-Landau equations. We then discuss the uniform bounds for both equations in Rn. In the last part of this report, we consider the Liouville type theorems for Lichnerowicz equation and Ginzburg-Landau equations in Rn via two approaches from the use of maximum principle and the monotonicity formula
Simulation on SO2 and NOX Emission from Coal–Fired Power Plants in North-Eastern North America  [PDF]
Shuangchen Ma
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.23028
Abstract: MM5-SMOKE-CMAQ regional air quality modeling system was used to simulate pollutants emission from coal–fired power plants in North-Eastern North America. The effects of SO2 and NOX on air quality producing from coal-fired power plants in the summer of 2001 were analyzed. Simulations show the contributions of SO2 and NOX emission from coal-fired power plants using different scenarios, coal-fired power plants from US and Canada contribute 67.2% and 32.8% for total SO2 concentration, 17.6% and 6.0% for total NOX concentration in researched domain. Some control measures for coal-fired power plants were discussed. Further controls for the emissions of SO2 and NOX from coal-fired power plants are necessary to reduce the adverse environmental effects.
The Theory of Vector-Valued Function in Locally Convex Space  [PDF]
Lixin Ma
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.38133
Abstract: In this paper, the vector-valued regular functions are extended to the locally convex space. The residues theory of the functions in the locally convex space is achieved. Thereby the Cauchy theory and Cauchy integral formula are extended to the locally convex space.
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