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Minimum Exact Cover Problem of Group Key Distribution

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Wuhan university Journal of Natural Sciences 2009年第2期14卷 137-142页

作者： FU Xiong1,2, XU Shouzhi3 1. School of Law ,Wuhan university, Wuhan 430072, Hubei, china 2. Department of Technology, Guangzhou Luogang District People’s Court, Guangzhou 510730, Guangdong, china 3. College of Electronic Engineering and Information Technology, china three gorges university, yichang 443002, Hubei, china School of Law Wuhan University Wuhan 430072 Hubei China Department of Technology Guangzhou Luogang District People’s Court Guangzhou 510730 Guangdong China College of Electronic Engineering and Information Technology China Three Gorges University Yichang 443002 Hubei China

Secure group communications are restrained by the number of the group size, number of changes and their distribution, all existing works do not meet the commands of applications with large group size and high dynamic members. In this paper, minimum exact cover problem for group key distribution （GMECP） is presented, and a heuristic solution is testified. Then an algorithm of batch rekeying with renewing cost tending to zero is illustrated, which can process any large number of change requests with best security guaranteed. Efficiency analysis and simulation test show that the achievement can improve the efficiency of any tree-based group key management.

关键词： minimum exact cover problem group key distribution secure multicast group key management

THE APPLICATIONS AND STUDY OF NUMERICAL SIMULATION OF TURBULENCE FLOW WITH FREE SURFACE IN HYDRAULIC SPILL WAYS STRUCTURE

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Journal of Hydrodynamics 1997年第4期9卷 53-54页

作者： Dai Hui-chaochina Yangtze three gorges Project Development Corporation,yichang 443002,P. R.china

The turbulence flow Free Surface has important applications in hydraulic spillways structure, such as the hydraulic jump, energy dissipation flow etc. This is being considered as very complicated flow, and has not yet been solved quite well by numerical method. In this paper, a Large-scale computational software package are developed for numerical laboratory of hydraulic spillway structure. Some methods,such as turbulence model, free surface and irregular boundary treating techniques,scientific computer visualization are put forward and performed.

关键词： turbulence model,free surface irregular boundary spillways structure

An Investigation of Stochastic Nature of Bed Load Motion in Chuanjiang River

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四川大学学报（工程科学版） 2005年第S1期37卷 112-117页

作者： ZHANG Zhixiang~1 HE Wenshe~(1,2) YANG Kejun~1 (1.State Key Lab.of Hydraulics and Mountain River Eng.,Sichuan Univ.,Chengdu 610065,china 2.china three gorges Project Corporation,yichang 443002,china)

Bed Load Motion and its transport rate is one of the basic issues in river *** this paper, the authors discussed the stochastic nature of bed load motion in Chuanjiang River in *** lies in the upstream reach of Yangtze *** stochastic nature is shown in the following four ***, even though all the conditions are the same,due to the fluctuation of the flow,the bed load discharge and the location and width of sediment transport belts are ***,during the ...

关键词： pebble bed load motion Chuanjiang River stochastic nature sediment transport rate

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《裂缝》的象征意义与莱辛的女性主义意识

外国文学研究 2010年第1期32卷 89-94页

作者：田祥斌张颂三峡大学外语学院三峡大学外国语学院

《裂缝》是莱辛2007年的新作。本文试图从环境对小说的烘托和小说中的象征意义去解说和剖析这部作品中的和谐的女性主义意识。《裂缝》是一部讲述人类起源的神话性质的作品。在人类发展初期,去掉现代社会的纷繁复杂,人和自然的单纯接触... 详细信息

《裂缝》是莱辛2007年的新作。本文试图从环境对小说的烘托和小说中的象征意义去解说和剖析这部作品中的和谐的女性主义意识。《裂缝》是一部讲述人类起源的神话性质的作品。在人类发展初期,去掉现代社会的纷繁复杂,人和自然的单纯接触也许更容易阐释人类和自然环境。《裂缝》中,虽然男人和女人从诞生之日起,就分开成了两个独立的部落,居住的不同地点、养育他们的不同环境等等却引导他们走向联合。这篇具有神话意义的小说无疑是女性小说中的经典之作,也是生态女性主义研究不可或缺的一部。小说通过象征手法隐喻了自然与人类以及男女之间的和谐。

关键词：莱辛《裂缝》女性主义象征双性同体

A Mehrotra-Type Predictor-Corrector Algorithm for P*（κ） Linear Complementarity Problems

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Journal of Mathematical Research with Applications 2012年第3期32卷 297-312页

作者： Weihua LI,Mingwang ZHANG,Yiyuan ZHOU College of Science,china three gorges university,Hubei 443002,P.R.china College of Science China Three Gorges University Hubei 443002

Mehrotra-type predictor-corrector algorithm,as one of most efficient interior point methods,has become the backbones of most optimization *** et *** a cut strategy based algorithm for linear optimization that enjoyed polynomial complexity and maintained its efficiency in *** extend their algorithm to P（κ）linear complementarity *** way of choosing corrector direction for our algorithm is different from theirs. The new algorithm has been proved to have an ο(（1+4κ）(17+19κ) √（1+2κn）log[（x）s/ε] worst case iteration complexity *** numerical experiment verifies the feasibility of the new algorithm.

关键词： P_*(κ)linear complementarity problems Mehrotra-type predictor-corrector algo- rithm polynomial iteration complexity interior point method.

Changes of infrared absorption wave number of aromatic-ring C=C bond of vitrinite and their significance

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Chinese Science Bulletin 1998年第12期43卷 1048-1050页

作者： XIAO Jianxin 1 and CHEN Shanqing 2 1. china university of Geosciences, Beijing 100083, china 2. yichang Institute of Geology and Mineral Resources, yichang 443003, china china university of Geosciences Beijing China yichang Institute of Geology and Mineral Resources Yichang China

The humilith series of lignite, longflame coal, gas coal, fat coal, coking coal, lean coal, meagre coal and anthracite are measured by FIR1600 infrared spectrophotometer. The variation curve between the infrared absorption wave number of aromaticring C--C bond of vitrinite and its reflectance values are gained, which shows the shift of infrared absorption wave number of aromaticring C--C bond of humic coals towards lower wave number with the increase of coalification. It is believed that the coal rank of humilith series can be determined and more evolutional information about coal composition and structure can be obtained by the infrared spectroscopic method.

关键词： aromatic_nucleus C--C bond infrared absorption wave number vitrinite humic coal.

Screening of Benzoic Acid Biodegradation Strains

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Wuhan university Journal of Natural Sciences 2010年第6期15卷 527-531页

作者： WANG Shulian,ZHANG Liping,WANG Xiaoxing,CHEN Dengxia,LI Xiaocong,HUANG Yingping Alan G.MacDiarmid Research Institute of Renewable Energy,china three gorges university,yichang 443002,Hubei,china Alan G. MacDiarmid Research Institute of Renewable Energy China Three Gorges University Yichang Hubei China

three strains BQ,BJ,and BS utilizing benzoic acid as the sole carbon source were achieved from yichang City,Hubei Province,china,through selective enrichment and *** BQ and BJ were primarily identified as *** while BS was *** three domestications,the removal rates of BQ,BJ,and BS to chemical oxygen demand（COD） value of benzoic acid were 62.41%,94.44%,and 43.34%,*** strains were mixed cultured,and the degradation rates of strains to benzoic acid at different temperature,pH and benzoic acid concentration were *** results show that the optimum degradation conditions about strains were pH 7.0,temperature 30 ℃,and aerobic with 1 500 mg/L of concentration of benzoic *** this condition,the COD removal rate of strains to benzoic acid reached 84.93%.

关键词： benzoic acid screening biodegradation

Effect of Curing Procedure on the Properties of Copper-Powder-Filled Conductive Adhesives

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Journal of Wuhan university of Technology(Materials Science) 2008年第3期23卷 323-325页

作者：郑小玲游敏 College of Mechanical and Material Engineering China Three Gorges University

By means of testing the shear strength with single lap joint, measuring electrical resistivity for cured products and the curing strain with strain gauges, the effect of cure parameters on the properties of HT1012 conductive adhesive filled with copper powder was investigated, and the residual stress in the conductive adhesives was also estimated. The experimental results show that the properties such as shear strength of the adhesives, electrical resistivity of products as well as the residual stress of cured HT 1012 copperfitted conductive adhesive were evidently affected by curing temperature and time. The diagrams of scanning electron microscopy （SEM） and Fourier transform infrared （FT-IR） were also used to determine the properties. The higher mechanical property was achieved under the condition of curing the adhesive 3 h at 60 ℃ as the density of the hydrogen links or linkages existed in the adhesive was relatively higher and the lower electrical resistivity occurred at 80 ℃.

关键词： conductive adhesives epoxy copper-powder-filled curing procedure

Visible light-induced N-doped TiO_2 nanoparticles for the degradation of microcystin-LR

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Science china Chemistry 2010年第8期53卷 1793-1800,1833-1835页

作者： YANG Jing,CHEN DengXia,DENG AnPing,FANG YanFen,LUO GuangFu,LI DeJiang,LI RuiPing & HUANG YingPing Alan G.MacDiarmid Research Institute of Renewable Energy,china three gorges university,yichang 443000,china 1. Alan G. MacDiarmid Research Institute of Renewable Energy China Three Gorges University Yichang 443000 China

N-doped nano-crystalline TiO2 powders have been synthesized by the sol-gel *** shape and crystal structure of the resulting N-doped TiO2 were investigated by X-ray Photoelectron Spectroscopy (XPS),X-ray spectroscopy (XRD),Transmission Electron Microscopy (TEM) and UV-vis reflection *** results showed that doping TiO2 with nitrogen can lower its band gap and apparently shift its optical response to the visible *** the visible light (λ> 420 nm) irradiation,the MC-LR was degraded by the synthesized N-TiO2 *** variation of MC-LR amount and its intermediates were detected by high performance liquid chromatography (HPLC) and LC-MS,*** mineralization of MC-LR was determined by total organic carbon (TOC) ***,transient oxidative species generated during photocatalysis were tracked by electron spin resonance (ESR) and Peroxidase *** these results indicated that visible-light excited N-TiO2 can activate molecular oxygen and thereby achieve degradation of MC-LR completely within 14 *** removal of 59% of TOC was achieved after 20 h *** major oxidative species in the system were hydroxyl radical (·OH) and H2O2.13 Kinds of intermediates were primarily identified in the *** on these results,a reasonable conclusion was drawn for the degradation of MC-LR wherein its four positions are easy to be attacked by the photo-generated OH radical followed by the hydrolyzation of peptides.

关键词： visible Light microcystin-LR N-doped titanium dioxide photocatalysis