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Search Results: 1 - 10 of 21945 matches for " JU Qi "
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Multilevel Monte Carlo Finite Element Method for A Stochastic Optimal Control Problem
Qi Sun,Ju Ming
Mathematics , 2015,
Abstract: In this paper, we consider the implementation of multi-level Monte Carlo method to a stochastic optimal control problem with log-normal coefficients and its surrogate model problem. From the perspective of two optimization problems, i.e., minimizing the accuracy using a fixed computational cost and minimizing the total computational cost to attain a given accuracy, we derive formulas to determine the optimal sample sizes for each level of multi-level Monte Carlo method. Furthermore, we put forward the multi-level Monte Carlo algorithm for our stochastic optimal control problem and some tricks to deal with the multi-level log-normal coefficients. Finally, we present the numerical results of both the elliptic SPDEs and our control problem to validate the effectiveness over the traditional Monte Carlo method.
Estimating the Propagation of Interdependent Cascading Outages with Multi-Type Branching Processes
Junjian Qi,Wenyun Ju,Kai Sun
Physics , 2014,
Abstract: In this paper, the multi-type branching process is applied to describe the statistics of line outages, the load shed, and isolated buses. The offspring mean matrix of the multi-type branching process is estimated by the Expectation Maximization (EM) algorithm and can quantify the extent of outage propagation. The joint distribution of two types of outages is estimated by the multi-type branching process via the Lagrange-Good inversion. The proposed model is tested with data generated by the AC OPA cascading simulations on the IEEE 118-bus system. The largest eigenvalues of the offspring mean matrix indicate that the system is closer to criticality when considering the interdependence of different types of outages. Compared with empirically estimating the joint distribution of the total outages, good estimate is obtained by using the multi-type branching process with a much smaller number of cascades, thus greatly improving the efficiency. It is shown that the multi-type branching process can effectively predict the distribution of the load shed and isolated buses even when there are no data of them.
Effect of heavy metals on soil nematode communities in the vicinity of a metallurgical factory
LI Qi,JIANG Yong,LIANG Wen-ju,
,JIANG Yong,LIANG Wen-ju

环境科学学报(英文版) , 2006,
Abstract: The influence of Cu and Zn on soil nematode communities was examined along a pollution gradient with increasing distance from a metallurgical factory. Total and available heavy metal contents were used to study the effects of heavy metals on nematode abun
A Study of Prognosis, Outcome, and Changing Tendency of Hospitalized AMI Patients in Beijing Third-Grade A-Level Traditional Chinese Medicine Hospitals from 1999 to 2008
Ju-Ju Shang,Hui Shi,Qi Zhou,Wei Gao,Hong-xu Liu
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/837194
Abstract: Objectives. To survey and analyse the prognosis, outcome, and changing tendency of the Acute Myocardial Infarction (AMI) patients in Beijing third-grade A-level Traditional Chinese Medicine (TCM) hospitals. Methods. We collected the clinical datum of hospitalized AMI patients in Beijing 6 TCM hospitals from January 1999 to December 2008 and then analysed the clinical datum. Results. (1) The mean age of patients had showed a slowly rising tendency during this ten years. The patients who had previous history of cerebrovascular diseasea and multiple comorbidities had increased year by year. (2) The rate of reperfusion therapy, revascularization and standardized using of drug, and usage of TCM of AMI patients presented a significant increasing tendency in these hospitals. (3) The proportion of AMI patients combined with cardiac arrhythmia and heart failure had decreased significantly. (4) The AMI mortality presented a decreasing tendency in 10 years. Conclusions. The AMI patients in Beijing TCM hospitals had their own unique clinical features, and it can improve their prognosis by combined therapy of Western Medicine and Traditional Chinese Medicine.
Quantitative differentiation of phenolic compounds in different varieties of buckwheat cultivars from China, Japan and Korea  [PDF]
Jeong Min Seo, Da Bin Lee, Mariadhas Valan Arasu, Qi Wu, Tatsuro Suzuki, Young-Ho Yoon, Sang-Won Lee, Sang Un Park, Sun-Ju Kim
Journal of Agricultural Chemistry and Environment (JACEN) , 2013, DOI: 10.4236/jacen.2013.24016
Abstract: The aim of this study was to determine the variation of phenolic compounds in common and tartary buckwheats collected from China, Japan and Korea. Two buckwheat varieties of each country were cultivated using nutrient solution and vermiculite in the greenhouse from February to May, 2012 and harvested at two-week intervals. Phenolics such as chlorogenic acid, C-glycosylflavones (orientin, isoorientin, vitexin, and isovitexin), rutin, and quercetin were quantified using high performance liquid chroma-tography (HPLC). At 17, 29, 44, 58, and 72 days after sowing (DAS), before harvesting each organs, rutin content of cultivars from China and Korea at 17 DAS was the highest (mean 43.63 and 39.95 mg?g–1 DW, respectively) than that of 29 and 44 DAS. However, two varieties from Japan at 44 DAS were documented maximum; whereas, the amount of rutin in “Hokkai T10” harvested at 44 DAS (58.36 mg?g–1 DW) was the highest of all cultivars. Rutin level in the leaves and stems at 72 DAS were comparatively higher than at 58 DAS. The highest of rutin content was found at 72 DAS (73.33 mg?g–1 DW) in “Hokkai T10” leaves followed by “Daegwan No.3-3” (61.13 mg?g–1 DW), “rice tartary” (53.89 mg?g–1 DW). Rutin content of flowers was presented as the highest amount in “Hokkai T10” at 72 DAS (88.3 mg?g–1 DW) was approximately 14-fold higher than that of 58 DAS (6.44 mg?g–1 DW). However, rutin content of flower in “Xiqiao No.2” was 3-fold higher at 72 DAS than at 58 DAS. Rutin and total phenolic compounds content in flowers, leaves, and stems were higher in the order. The content of four C-glycosylflavones in common buckwheat was higher than those in tartary buckwheat, but rutin content which accounted >90% of the total phenolic compounds was higher in tartary buckwheat. The highest amounts of chlorogenic acid and quercetin were measured in the flower of “Xiqiao No.2” (6.85 and 11.69 mg?g–1 DW, respectively). Based on these results, the presence of different phenolic compounds in all the varieties of buckwheat confirmed that it can be regarded as a potent source of functional foods.
The Enlightenment of Marxist Saving Thoughts on the Revitalization of Rural Ecology in China  [PDF]
Yang Ju
Chinese Studies (ChnStd) , 2018, DOI: 10.4236/chnstd.2018.72013
Abstract: On October 18, 2017, Comrade Jinping Xi proposed a strategy for the revitalization of villages in the report of the 19th CPC National Congress. The issue of agriculture and rural peasants is a fundamental issue related to the national economy and the people’s livelihood. The issue of solving the “three rural issues” must always be regarded as a top priority for the work of the whole Party. Therefore, the strategy of rejuvenating the country is proposed. The problems to be solved in the process of revitalization of rural ecology in China are closely related to Marx’s idea of economy in “Das Kapital”. From the perspective of Marx’s saving ideas, this article combines the content of China’s rural revitalization strategy and sums up Marx’s idea of conservation, drawing an important revelation for in the Process of Revitalizing Rural Ecosystem in China.
Spatial distribution characteristics of plant-parasitic nematodes in cultivated horizon of a site-specific experimental field


生态学报 , 2006,
Abstract: 采用经典统计学与地统计学相结合的方法,对中国科学院沈阳生态实验站定位试验地耕层土壤中植物寄生线虫的空间分布特征进行研究。结果表明,在田间尺度下螺旋属(Helicotylenchus)、垫刃属(Tylenchus)是上下两层土壤中植物寄生线虫的优势属,矮化属(Tylenchorchychus)为下层土壤中的优势属,这3个属线虫数量占植物寄生线虫总数的92%。除下层矮化属线虫外,上下两层土壤中植物寄生线虫空间变异为48%-100%,其空间自相关范围为35~91m。克里格插值分析表明,上层土壤中植物寄生线虫总数与螺旋属线虫数量、上下层土壤中垫刃属线虫数量呈现出相似的空间分布格局。这些结果反映了不同属的植物寄生线虫沿水平和垂直方向活动性上的差异;由此可以进一步推测垫刃属和矮化属线虫向下迁移能力强于螺旋属线虫。

QI Taiyue,LIU Qiang,JU Guoquan,

岩石力学与工程学报 , 2010,
Abstract: 针对修建大跨度地铁车站的工法优化对地表沉降的影响,首先应用数值模拟方法对5种工法进行优化比选,初步确定8步工法为最优工法,然后应用模型试验验证该工法。对比分析表明,2种方法所得结果吻合良好,即5种工法都能满足地表沉降控制和结构稳定性要求,其中8步工法比其他4种工法的地表沉降控制效果和结构受力状况更优,其关键工序是第14道工序。

ZONG Qi,LU Peng-ju,LUO Qiang,

岩石力学与工程学报 , 2005,
Abstract: Charged with air cushion,the blasting mechanism of smooth blasting with soft cushion charging construction is studied. Namely,the soft cushion can not only decrease the pressure of explosion shock waves and explosive gases in order to reduce the shock compress breaking on hole-wall,but also can extend the action time of explosive gas-pressure and improve the quality of breaking cracks of smooth blasting under the quasi-static pressure of explosive gases. According to the requirements of smooth blasting,axial decoupling coefficients of charging construction with air soft cushion are analyzed. Correspondingly,the theoretical calculation formulas are presented. Finally,the axial decoupling coefficient values of smooth blasting in some rocks with air layer are calculated,and the air soft cushion charging construction is used in engineering practice of smooth blasting. The results show that air soft cushion is an effective smooth blasting charging construction.
Clustering algorithm based on residual energy and node degree for WSNs

FU Ju-ping,QI Xiao-gang,

计算机应用研究 , 2011,
Abstract: To solve the energy efficiency problem in the wireless sensor networks, this paper presented a clustering algorithm based on residual energy and node degree(BREND). In cluster heads election phase of every round, by twice clustering election for the final cluster heads, it considered the residual energy and nodes degree of all the nodes in each cluster. On the one hand, it avoided the nodes that have lower energy were elected as cluster heads, on the other hand, it adopted temporary clu-ster heads quiting strategy, that was there was only one temporary cluster head in a node communication scope, which made cluster heads distribution more equably. Simulation results show that, in comparison with LEACH and ENCA, the network lifetime is efficiently prolonged.
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