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Search Results: 1 - 10 of 113973 matches for " LIU Hua-Jing "
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Establishment of molecular ID in 11 Ganoderma lucidum strains
11个灵芝菌株的分子ID构建

ZHANG Xiao-Y,XU Xiu-Hong,LIU Hua-Jing,
张肖雅
,许修宏,刘华晶

微生物学通报 , 2013,
Abstract: Objective] Eleven Ganoderma lucidum strains were collected as materials for classifying them at the molecular level and establishing the molecular ID. Methods] Internal transcribed spacer (ITS) and simple sequence repeat (SSR) markers were used for the molecular identification of eleven Ganoderma lucidum strains. Results] 99% similarity in ITS sequence between the tested strains and the Ganoderma lucidum registered in GenBank, meaning that the tested strains were Ganoderma lucidum species. The cluster analysis by NTSYS revealed that eleven Ganoderma lucidum strains were divided into four groups at similarity coefficients of 0.62. GL-2 and GL-4 were in two clades respectively. According to fragment size of allele variation, the agarose gel electrophoresis bands were analyzed by the software ID Analysis 1.0. Five primer pairs could be used to identify all the tested strains and accomplish the establishment of molecular ID. Conclusion] Establishment of molecular ID in Ganoderma lucidum based on SSR were feasibly.
ECOPHYSIOLOGICAL RESPONSE OF EMMENOPTERYS HENRYI TO THE HABITATS IN DIFFERENT ALTITUDES IN CHINA''S DAPAN MOUNTAIN NATURAL RESERVE
大盘山自然保护区香果树对不同海拔生境的生理生态响应

LIU Peng,CHEN Zi-Lin,KANG Hua-Jing,LIU Peng,XU Gen-Di,CHEN Zi-Lin,WEI Fu-Min,
康华靖
,刘 鹏,徐根娣,陈子林,韦福民

植物生态学报 , 2008,
Abstract: 在全面调查大盘山国家级自然保护区香果树(Emmenopterys henryi)分布的基础上,设置了4个海拔段(A1:550~650m,A2:680~770rn,A3:810~900m,A4:970~1100m),对不同海拔段内香果树的生理生态特性进行研究,结果显示,叶绿素a(Chla)、叶绿素b(Chlb)和总叶绿素(Chl(a+b))含量均随着海拔的上升而减小,高海拔A4与低海拔A1相比,Chla、Chlb和Chl(a+b)含量分别下降了21.32%、31.53%和24.96%,差异均达到显著水平。分析认为,主要是由于相对较强的光照以及干旱胁迫的增强所致。同样,比叶面积(SLA)也随着海拔的上升而减小,A4与A1相比下降了27.55%,差异达到显著水平。丙二醛(MDA)含量和质膜透性(MP)变化较为一致,两者均在A3处达到最低水平,在A4处达到最高,说明在A3受到的伤害最小而在A4受到的伤害最大;脯氨酸(Pro)和抗坏血酸(AsA)含量先升高再降低,在A3处则均达到最高,与A1相比分别增加了139.33%和10.60%;酶保护系统中的超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)活性在A1均最小,随着海拔的升高,其活性变化则不太一致:SOD活性一直增加,POD、CAT和APX活性虽然都是先增加后减小,但POD和APX在A3达到最高,CAT则是在A2最高。非酶类保护物质含量的增加和酶活性的增强有利于清除细胞内的活性氧,维持细胞膜的稳定性,从而保证植物的正常生长。综合此次实验结果表明,在中海拔(810~900m)比较适合香果树的生长,而高海拔(970~1100m)则不适合香果树的生长。
Cascading Failures of Complex Networks Based on Two-Step Degree

WU Zhi-Hai,FANG Hua-Jing,

中国物理快报 , 2008,
Abstract: We propose a new concept, two-step degree. Defining it as the capacity of a node of complex networks, we establish a novel capacity--load model of cascading failures of complex networks where the capacity of nodes decreases during the process of cascading failures. For scale-free networks, we find that the average two-step degree increases with the increase of the heterogeneity of the degree distribution, showing that the average two-step degree can be used for measuring the heterogeneity of the degree distribution of complex networks. In addition, under the condition that the average degree of a node is given, we can design a scale-free network with the optimal robustness to random failures by maximizing the average two-step degree.
l1 OPTIMIZATION APPROACH TO CONTROL SYSTEM ROBUST FAULT DETECTION
控制系统鲁棒故障检测的l1优化方法

FANG Hua-Jing,
方华京

自动化学报 , 2002,
Abstract: A new robust fault detection method is proposed based onl\ 1 optimization. A uniform formula is presented to unify several existing methods of the kind. Finally these methods are compared with through simulation examples.
Observer Based l1 Robust Fault Detection
基于观测器的l1鲁棒故障检测方法

FANG Hua-jing,
方华京

控制理论与应用 , 2001,
Abstract: Based on the factorization of control systemoutput observer, a new robust fault detection strategy has been presented by using the l1 optimization theory. The l1 optimal residual function can be obtained by solving a mixed 0-1 type integer linear programming problem. The validity of the new strategy was proved by simulation results.
Optimal Weights for Consensus of Networked Multi-Agent Systems
Xiang-Shun Li,Hua-Jing Fang
Information Technology Journal , 2009,
Abstract: In this study, a way to design the optimal weights associated with edges of undirected graph composed of multi-agent systems is presented. The optimal weights are designed to make the states of the multi-agent systems converge to consensus with a fast speed as well as the maximum communication time-delay can be tolerated. The method used in our research is based on linear matrix inequality theory. The convergence speed which is determined by the second-smallest eigenvalue of graph Laplacian matrix is assumed to be a given value, at the same time the maximum communication time-delay which is decided by the maximum eigenvalue of Laplacian matrix can be got. In order to get required second-smallest eigenvalue and optimal maximum eigenvalue, the order of Laplacian matrix is reduced by variable decomposition. Moreover, designing the optimal weights is equivalent to minimizing condition number of a positive-definite matrix. Simulation results are coincidental with theoretical analysis.
Stability of Continuous-Time Vehicles Formations with Time Delays in Undirected Communication Network
Xiang-Shun Li,Hua-Jing Fang
Information Technology Journal , 2009,
Abstract: This study mainly focuses on stability analysis of vehicles formations with time delays in the communication network. The network model with time delays of swarm vehicles for continuous-time systems is introduced. The vehicles exchange information according to a pre-specified (undirected) communication graph. The feedback control is based only on relative information about vehicle states shared via the communication links. Asymptotical stability of vehicles formations for both delay-independent and delay-dependent cases is analyzed. The sufficient conditions for vehicles formations stabilities are investigated based on tools from linear matrix inequality theory, algebraic graph theory, matrix theory and control theory. Finally, an illustrative example is used to show the validity of the theoretical results.
Adaptive Stabilization of Networked Control Systems
A.H. Tahoun,Fang Hua-Jing
Journal of Applied Sciences , 2007,
Abstract: The insertion of data network in the feedback adaptive control loops makes the analysis and design of Networked Control Systems (NCS) more complex than traditional control systems. This study addresses the adaptive stabilization problem of linear time-invariant networked control systems. The case of state feedback is treated in which only an upper bound on the norm of matrix A is needed. The problem is to find an upper bound on the transmission period h that guarantees the stability of the overall adaptive networked control system under an ideal transmission process, i.e., no transmission delay or packet dropout. Rigorous mathematical proofs are established, that relies heavily on Lyapunov's stability criterion. Simulation results are given to illustrate the efficacy of our design approach.
H∞ Controller for Consensus of Swarm Agents with Complete and Incomplete Communication Graphs
Xiang-Shun Li,Hua-Jing Fang
Journal of Applied Sciences , 2009,
Abstract: This study mainly focuses on design method for H∞ controllers achieving consensus among the autonomous agents within swarm. A robust controller is designed for the entire closed-loop system to achieve consensus among the agents, while the non-consensus part is Lyapunov stable based on the robust disturbance rejection. Two cases are considered. The first one is that the agents in the swarm can interact with every other agent when each agent can receive information from every other. The other one is that the topology structure composed by the agents is fixed when each agent in the swarm can only exchange information with some agents but not all other agents. Simulation results demonstrate that designed controller for the system can make the closed-loop system reach consensus with non-consensus part be Lyapunov stable meeting the H∞ performance for disturbances attenuation.
POPULATION QUANTITATIVE CHARACTERISTICS AND DYNAMICS OF RARE AND ENDANGERED TSUGA TCHEKIANGENSIS IN JIULONGSHAN NATURE RESERVE OF CHINA
九龙山珍稀濒危植物南方铁杉种群数量动态

ZHANG Zhi-Xiang,LIU Peng,CAI Miao-Zhen,KANG Hua-Jing,LIAO Cheng-Chuan,LIU Chun-Sheng,LOU Zhong-Hua,
张志祥
,刘 鹏,蔡妙珍,康华靖,廖承川,刘春生,楼中华

植物生态学报 , 2008,
Abstract: 针对九龙山国家级自然保护区南方铁杉(Tsuga tchekiangensis)种群的分布特点,设置了10个具有代表性的样地.以种群生命表及生存分析理论为基础,编制了南方铁杉种群的静态生命表,绘制了存活曲线、死亡率曲线、消失率曲线、生存率曲线、累计死亡率曲线、种群死亡密度曲线和危险率曲线,分析了种群数量特征;同时结合谱分析方法,分析了南方铁杉种群数量的动态变化.结果表明:1)南方铁杉种群结构存在波动性,幼年阶段的个体较丰富,成年个体数量相对DW较少,种群趋于Deevey Ⅱ型.2)南方铁杉种群死亡率和消失率曲线变化趋势基本一致,均出现两个高峰,一个出现在第5龄级阶段,另一个出现在第15龄级阶段.3)南方铁杉种群的生存率单调下降,累计死亡率单调上升,生存率下降趋势前期高于后期,累计死亡率则相反.4)4个生存函数曲线表明,南方铁杉具有前期稳定、中期锐减和后期衰退的特点.5)种群动态的谱分析显示,南方铁杉种群动态除受基波影响外,还存在着明显的小周期波动,谐波A3处周期的波动与南方铁杉的高生长有关;A6处周期的波动与外界环境变化有关;A8处周期的波动与南方铁杉进入生理衰退期有关.
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