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Search Results: 1 - 10 of 18354 matches for " Tian-jiao Pu "
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Power System Reactive Power Optimization Based on Fuzzy Formulation and Interior Point Filter Algorithm  [PDF]
Zheng Fan, Wei Wang, Tian-jiao Pu, Guang-yi Liu, Zhi Cai, Ning Yang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B134

Considering the soft constraint characteristics of voltage constraints, the Interior-Point Filter Algorithm is applied to solve the formulation of fuzzy model for the power system reactive power optimization with a large number of equality and inequality constraints. Based on the primal-dual interior-point algorithm, the algorithm maintains an updating “filter” at each iteration in order to decide whether to admit correction of iteration point which can avoid effectively oscillation due to the conflict between the decrease of objective function and the satisfaction of constraints and ensure the global convergence. Moreover, the “filter” improves computational efficiency because it filters the unnecessary iteration points. The calculation results of a practical power system indicate that the algorithm can effectively deal with the large number of inequality constraints of the fuzzy model of reactive power optimization and satisfy the requirement of online calculation which realizes to decrease the network loss and maintain specified margins of voltage.

Calculation and analysis of DPA in the main components of CSNS target station

Yu Quan-Zhi,Yin Wen,Liang Tian-Jiao,

物理学报 , 2011,
Abstract: The damage energy cross sections and displacement cross sections of W, SS316 and Al-6061, which will be used in the CSNS (China Spalllation Neutron Source) target station, were calculated with the high energy transport code MCNPX 2.5.0. The DPA (Displacement Per Atom) distributions were also calculated and anlyzed for the main components in the CSNS target station, such as the W target, the target vessel, the moderators and reflector vessels. Based on the DPA caused by neutrons and protons, the lifetime of these components were estimated. The influence of the proton beam profile on the peak value of DPA for W target and target vessel were also presented. These calculations and analyses are very important for the under going CSNS project.
Bremsstrahlung diagnostics of hot electrons in laser-plasma interactions

Xu Miao-Hua,Liang Tian-Jiao,Zhang Jie,

物理学报 , 2006,
Abstract: 超短脉冲强激光与等离子体相互作用时产生的向靶内传输的超热电子在“快点火”方案中起着极其重要的作用.对于这部分向靶内传输的超热电子,韧致辐射方法是一种能有效、全面获得超热电子各方面信息的诊断方法.通过三维蒙特卡罗程序MCNP模拟了超热电子在靶材料中的输运以及它们在靶后方向产生的韧致辐射的性质,论证了韧致辐射诊断方法的可行性.
Noisy blind source separation algorithm based on new threshold function of wavelet transform

ZHAO Tian-jiao,HE Xuan-sen,CHEN Li,

计算机应用研究 , 2010,
Abstract: This paper used a method which was based on bias removal technology of natural gradient algorithm under the noisy circumstances to estimate the demixing matrix. Then applied a new wavelet threshold function to separated signals to remove noise. The simulations verify that this algorithm is robust and improves the SNR of the ultimate results obviously.
Application of the First Collision Source Method to CSNS Target Station Shielding Calculation
Ying Zheng,Bin Zhang,Meng-Teng Chen,Liang Zhang,Yi-Xue Chen,Wen Yin,Tian-Jiao Liang
Physics , 2015,
Abstract: Ray effects are the inherent problem of discrete ordinates method. RAY3D, a functional module of ARES which is a discrete ordinates code system, employs a semi-analytic first collision source method to mitigate ray effects. This method decomposes the flux into uncollided and collided components, and then calculates them with analytical method and discrete ordinates method respectively. In this article, RAY3D is validated by the Kobayashi benchmarks and applied to the neutron beamline shielding problem of China Spallation Neutron Source (CSNS) target station. Numerical results of the Kobayashi benchmarks indicate that DONTRAN3D with RAY3D solutions agree well with the Monte Carlo solutions. The dose rate at the end of the neutron beamline is less than 10.83 {\mu}Sv/h in CSNS target station neutron beamline shutter model. RAY3D can effectively mitigate ray effects and obtain relatively reasonable results.
Assessment of vegetable safety and heavy metal contamination risk in decomposed rape straw and coal gangue soilless culture substrate

TONG Guan-He,CHEN Jin-Yun,LIU Tian-Jiao,LUO Xun,

中国生态农业学报 , 2011,
Abstract: 以腐熟油菜秸秆、煤矸石等废弃资源为原料, 配制有机生态型无土栽培混合基质, 在人工光照室内以盆栽的方法栽培白菜、生菜、苋菜和菠菜, 采用尼梅罗综合污染指数和Hakanson 潜在生态风险指数法对5 种混合基质以及此基质中生长的 4 种蔬菜的重金属污染和潜在生态风险进行综合评价。结果表明: 5 种混合基质中, 煤矸石含量较少的T1、T2、T3(即煤矸石与腐熟油菜秸秆的体积比分别为 2∶8、3∶7 和4∶6)基质的重金属污染程度较小, 潜在生态风险程度较低, 在这 3 种基质上栽种的蔬菜重金属综合污染评价等级为优良或安全, 符合蔬菜绿色食品标准。重金属对混合基质产生的污染中, Cd 和Hg 是主要的重金属污染及潜在生态风险因子, 其他重金属(Cr、Cu、Pb、Zn、As)的污染能力较低。此外, 影响混合基质重金属生物有效性的主要因子是有机质, 除Cd、As 外, 基质中的有机质含量与有效态重金属含量存在极显著负相关, 基质pH 对其影响较小。
Calculations of radioactivity and afterheat in the components of the CSNS target station

Yu Quan-Zhi,Liang Tian-Jiao,Yin Wen,Yan Qi-Wei,Jia Xue-Jun,Wang Fang-Wei,

中国物理 B , 2009,
Abstract: This paper shows the calculations of radioactivity and afterheat in the components of the China Spallation Neutron Source (CSNS) target station, with the Monte Carlo codes LAHET, MCNP4C and the multigroup code CINDER'90. These calculations provide essential data for the detailed design and maintenance of the CSNS target station.
Association between glutamate receptor 2 polymorphisms and epilepsy in children

王娴, 朱天娇, 万致婷, 朱雪梅
, ZHU Tian-Jiao, WAN Zhi-Ting, ZHU Xue-Mei

- , 2016, DOI: 10.7499/j.issn.1008-8830.2016.06.005
Association of TIAM1 gene polymorphisms with Kawasaki disease and its clinical characteristics

王娴, 朱天娇, 周雄飞, 万致婷
, ZHU Tian-Jiao, ZHOU Xiong-Fei, WAN Zhi-Ting

- , 2015, DOI: 10.7499/j.issn.1008-8830.2015.11.013
First Flush Analysis of PAHs in Roof Runoff in Beijing

OU Lang-bo,HU Dan,HUANG Ye,CUI Si-yu,GUO Tian-jiao,ZHANG Wei,WANG Xue-jun,

环境科学 , 2011,
Abstract: Roof runoff samples of six storm events were collected at three different sites in the urban area of Beijing during the rainy season of 2008.The samples were analyzed for PAHs in both particle and dissolved phases. On the basis of the field measured data, the first flush phenomenon of PAHs was quantitatively analyzed using a newly defined FFn-Max, and the influences of the storm event characteristics were discussed. In roof runoff, the first flush phenomena of total PAHs and PAHs in particle phase were noted, and PAHs in dissolved phase was not observed with first flush. The ranges of the first flush values for FF25 and FF30 were 0.6-2.4 and 0.6-2.1, respectively. For different types of roof materials, the strength of the first flush followed the order of: tile roof, cement roof > asphaltic felt roof. There is no significant difference between the tile roof and cement roof. No significant correlation was observed between the occurrence of first flush and the rainfall characteristics.
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