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Adaptive synchronization and parameter identification for Lorenz chaotic system with stochastic perturbations
随机扰动下Lorenz混沌系统的自适应同步与参数识别

Zhu Da-Wei,Tu Li-Lan,<br>,涂俐兰
物理学报 , 2013,
Abstract: In this paper, Lorenz chaotic system with stochastic perturbation and unknown parameters is investigated, in which the stochastic perturbations is one-dimensional random process of the standard Wiener. Based on stochastic Lyapunov stability theory, It formula and adaptive control method combined with three adaptive control laws and two adaptive control laws respectively, two mean square Asymptotic adaptive synchronization standards are put forward theoretically. These new standards are in a simple form and easy to deal with. Moreover, with these standards, not only drive system with stochastic perturbations can be synchronized with the respond system, but also unknown parameters in the system can be identified. Finally, the Matlab numerical simulations confirm that the proposed results are correct and effective.
Molecular dynamics study on thermal conductivity of diamond nanoparticles
纳米金刚石颗粒导热系数的分子动力学研究

Li Xiao-Bo,Tang Da-Wei,Zhu Jie,<br>李小波,,
中国科学院研究生院学报 , 2008,
Abstract: By using molecular dynamics (MD) simulation method, we studied temperature dependence and nanoparticle-size dependence of thermal conductivity of diamond nanoparticles. In order to get more reliable results, equilibrium molecular dynamics (EMD) method was applied. We set a relatively long integral time in the calculation of heat current autocorrelation function (HCACF), and got convergent results. Our results indicate that due to size effect, thermal conductivity of diamond nanoparticles is smaller than the one of bulk diamond. As temperature varies, thermal conductivity shows a peak value at 61.6K, which behaves a little different from bulk diamond. As particle size increases, thermal conductivity increases; from the tendency of our plot, we predict that thermal conductivity of diamond nanoparticles will converge at the value of bulk diamond with a proper size. More work will be done on this prediction in our future researches.
Analysis of nucleotide sequence of wheat yellow mosaic virus genomic RNAs
YU Jialin,<br>于嘉林,晏立英,苏宁,侯占军,,韩成贵,杨莉莉,,刘仪
中国科学C辑(英文版) , 1999,
Abstract: Wheat yellow mosaic virus (WYMV) isolate HC was used for viral cDNA synthesis and sequencing. The results show that the viral RNA1 is 7 629 nucleotides encoding a polyprotein with 2 407 amino acids, from which seven putative proteins may be produced by an autolytic cleavage processing besides the viral coat protein. The RNA2 is 3 639 nucleotides and codes for a polyprotein of 903 amino acids, which may contain two putative non-structural proteins. Although WYMV shares a similarity in genetic organization to wheat spindle streak mosaic virus (WSSMV), the identities in their nucleotide sequences or deduced amino acid sequences are as low as 70% and 75% respectively. Based on this result, it is confirmed that WYMV and WSSMV are different species within Bymovirus .
Expression of Beet Necrotic Yellow Vein Virus Coat Protein Gene in Transformed Sugarbeet Plants
甜菜坏死黄脉病毒外壳蛋白基因在甜菜转基因植株中的表达

Yao Huajian,Li Dawei,Yu Jialin,Xing Yiming,Cai Zhunan,Liu Yi,<br>姚华建,,于嘉林,邢怡明,,刘仪
生物工程学报 , 1997,
Abstract: 甜菜坏死黄脉病毒(Beet Necrotic Yellow Vein Virus,BNYVV)是一种由甜菜多粘菌(Polymyxo be tae)传播的多分体植物病毒.基因组由4~5条单链正意RNA构成1]。60年代末,由Tamada首次报道2],这种病毒可对甜菜造成严重危害,侵染甜菜后产生丛根症状(Rhizomania),并导致甜菜产量和含糖 量的大幅度下降。除欧洲、北美及日本的严重发生以外,我国自70年代以来在东北、内蒙古及西北许多省区也有大量甜菜丛根病的发生报道3]。由于尚无有效药剂及措施用于甜菜丛根病或病毒传播介体的防治.在我国也无法采用大面积轮作作为防治手段,所以目前在世界各地及我国上述地区甜菜丛根病的发病面积逐年扩展,对甜菜生产和制糖业造成直接威胁。针对这一情况.本文报道了含有甜菜坏死黄脉病毒外壳蛋白基因的甜菜植株的转化再生工作,以期在甜菜亲本育种中获得新的抗性材料.为抗病毒品种的培育打下基础。
THE CLONING AND PCR DETECTION OF GENOMIC DNAFRAGMENT OF POLYMYXA BETAE
甜菜多粘菌基因组片段的克隆及PCR检测

Wang Qi,Han Cheng-Gui,Li Da-Wei,Yu Jia--Lin,Wang Hui--Min,Cai Zhu--Nan,Liu Yi,<br>王琦,韩成贵,,于嘉林,王慧敏,,刘仪
菌物学报 , 1999,
Abstract: According to reports, primers were designed to amplify the genomic DNA fragment of P. betae,which was cloned to pGEM--3Zf( ). By restriction endonuclease digestion, PCR amplification and sequenceanalysis, the cloned DNA fragment is identificated as gemomic fragment of P. betae. NO any DNA product wasobtained in detection of P. graminis or O. brassicae from infected roots of wheat or string bean respectively,which further proved that the primers used for DNA fragment amplification of P. betae is specific to P. betaeonly. Posttransplant in infected soil for two or thee and half a days, cruds DNA was extracted from single rootof sugar beet seedlings and used for PCR test which showed that P. betae DNA could be identified specificallyin the sugar beet seedlings with easy infection period.
NULL DISTRIBUTION OF LIKELIHOOD RATIOSTATISTIC FOR AND AGAINST CONVEX CONES INTHE LINEAR MODEL
线性模型中假设是凸锥时似然比统计量的零分布

Guo Dawei,<br>郭
系统科学与数学 , 1999,
Abstract: For the linear model with Gaussian errors and known covariance matrix, testingproblems are discussed where hypotheses form convex cones. After stating some properties ofthe likelihood ratio statistic, we show that the null distribution is a mixture of X2-distributionswhen the likelihood ratio statistic is a convex function of the observations. In contrast to this,the previous results are applicable only if the null or the alternative hypothesis forms a linearspace.
甜菜坏死黄脉病毒RNA5对病毒致病性的影响
刘涛,韩成贵,,,于嘉林,刘仪
科学通报 , 2003,
Abstract: 利用甜菜坏死黄脉病毒(Beet necrotic yellow vein virus,BNYVV)RNA5全长侵染性cDNA克隆体外转录获得的RNA5体外转录物,与只含有RNA1,2以及RNA1,2和3的两个BNYVV突变株BYNVV-Hu0和BNYVV-Hu3的RNAs分别混合,并接种于寄主植物番杏(Tetragonia expansa)和甜菜(Beta vulgaris L).结果表明,RNA5是BNYVV中除RNA3以外的另一个病毒致病性相关分子,它的存在能够提高病毒的侵染效率和在寄主体内的积累水平,并与RNA3协同作用,导致病毒侵染后的症状表现加重。
甜菜坏死黄脉病毒RNA5对病毒致病性的影响
刘涛,韩成贵,,,于嘉林,刘仪
科学通报 , 2003,
Abstract: 利用甜菜坏死黄脉病毒(Beetnecroticyellowveinvirus,BNYVV)RNA5全长侵染性cDNA克隆体外转录获得的RNA5体外转录物,与只含有RNA1,2以及RNA1,2和3的两个BNYVV突变株BNYVV-Hu0和BNYVV-Hu3的RNAs分别混合,并接种于寄主植物番杏(Tetragoniaexpansa)和甜菜(BetavulgarisL).结果表明,RNA5是BNYVV中除RNA3以外的另一个病毒致病性相关分子,它的存在能够提高病毒的侵染效率和在寄主体内的积累水平,并与RNA3协同作用,导致病毒侵染后的症状表现加重.
甜菜坏死黄脉病毒RNA4的菌传功能分析
韩成贵,,王东勇,杨莉莉,于嘉林,,刘仪
科学通报 , 2002,
Abstract: 构建了甜菜坏死黄脉病毒(BNYVV)RNA4全长核苷酸序列以及5种编码区突变体的侵染性cDNA克隆,不同结构伯RNA4体外转录物与只含有RNA1,2和3的BNYVV分离物总RNAs混合后分别接种寄主植物番杏(Tetragonia expansa)作为毒源,繁殖后接种甜菜,利用无毒甜菜多黏菌(Polymyxa betae)进行传毒实验,结果表明,RNA4编码区内各种缺失突变均能显著地抑制多黏菌的传播,但插入4个碱基的移码突变体对传毒没有影响,说明BNYVVRNA4中的部分核苷酸序列对于被真菌介体高效传播是必需的,并且可能是在RNA水平上具有功能。
甜菜多粘菌基因组片段的克隆及PCR检测
王琦,韩成贵,,于嘉林,王慧敏,,刘仪
菌物学报 , 1999,
Abstract: 根据资料报导设计引物,扩增Polymyxabetae的基因组片段.将其克隆在pGEM-3Zf(+)质粒载体上.并通过双酶切、PCR扩增和部分序列测定.证明克隆片段为P.betae基因组片段。用扩增P.betae基因组片段的引物对由P.graminis侵染小麦和O.brassicae侵染豇豆根系抽提的总DNA进行PCR扩增,均来获得任何DNA产物,进一步证实了上述结果。对移人病土2.3.5天的甜菜苗单株根系进行DNA粗提,移人病土3.5天的甜菜苗PCR检测其已被P.betae侵染,对确定P.betae的早期侵染有重要意义.
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