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Search Results: 1 - 10 of 152749 matches for " WANG Bao-Jun "
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Sliding Mode Control of Surface-Mount Permanent-Magnet Synchronous Motor Based on Error Model with Unknown Load
Bao-jun Wang,Jia-jun Wang
Journal of Software , 2011, DOI: 10.4304/jsw.6.5.819-825
Abstract: Surface-mount permanent-magnet synchronous motor(SPMSM) has been widely applied in accurate motion control. In this paper, the SPMSM model is divided into electrical magnetic subsystem and electrical mechanical subsystem. Then a novel error model is given by which the controllers can be designed easily. In the general PMSM controllers design, the unknown load is often neglected. In this paper, a proportional speed error is used to take the place of the unknown load without using load estimation. Based on the error model of the SPMSM, sliding mode controllers are designed to enhance the robustness of the SPMSM drive system. At last, many simulation results are given to show the effectiveness of the proposed scheme.
Computing the response of multi-component induction logging in layered anisotropic formation by the recursive matrix method for magnetic-current-source dyadic Green''s function
用磁流源并矢Green函数的递推矩阵方法计算层状各向异性地层中多分量感应测井响应

WEI Bao-Jun,WANG Tian-Tian,WANG Ying,
魏宝君

地球物理学报 , 2009,
Abstract: 采用递推矩阵方法计算各向异性介质的磁流源并矢Green函数,并利用上述并矢Green函数对层状各向异性倾斜地层中多分量感应测井的响应进行数值模拟,分析了线圈距、层厚、倾角和围岩对多分量感应测井响应的影响.计算发现,共面视电导率比共轴视电导率变化规律复杂,不能反映地层电导率的真实情况.各向异性地层共轴视电导率随井眼相对倾角的增加而减小,而共面视电导率随井眼相对倾角的增加而增加.仪器的垂向分辨率、围岩各向异性对目的层响应的影响程度取决于线圈距,围岩各向异性对高电导率目的层中测井响应的影响大于对高电阻率目的层中测井响应的影响.
The basic theory of electromagnetic wave resistivity instrument and its application to measurement of while-drilling
电磁波电阻率仪器的基本理论及其在随钻测量中的应用

WEI Bao-jun,WANG Ying,WANG Tian-tian,
魏宝君

地球物理学进展 , 2009,
Abstract: 采用递推矩阵方法计算径向成层介质的Green函数并将其作为电磁波电阻率仪器的基本理论.根据圆柱形层界面处电场和磁场的连续性条件得到确定待定系数的矩阵方程组并通过递推方法快速求解.只需改变方程组中源项元素的位置,就可以方便地得到当源点和场点在任意层时的Green函数,形式简洁、易于编程.采用将变型Bessel函数的指数项单独列出的方式有效地解决了Green函数计算中的上溢问题.用上述Green函数对随钻电磁波电阻率测量仪器进行数值模拟,分析了钻铤的影响规律、井眼校正方法、仪器的径向探测特性和垂向分辨率.所得到的结论可为随钻电磁波电阻率测量仪器的研制和使用提供理论指导.
Perspectives on the cultivability of environmental microorganisms
环境微生物培养新技术的研究进展

WANG Bao-Jun,LIU Shuang-Jiang,
王保军
,刘双江

微生物学通报 , 2013,
Abstract: 遍布于地球上各种生境中的微生物具有丰富的物种多样性。迄今为止, 能够在实验室条件下培养的微生物仅仅是其中的一小部分, 微生物物种的绝大多数还都难以在现有培养技术和条件下进行繁殖和生长。人们把那些尚未在实验室获得培养生长的微生物称之为未培养微生物(Uncultured microorganisms)。本文概述了一些制约微生物培养生长的影响因素, 重点介绍了近年来出现的一些新颖独特的环境微生物培养技术和方法, 包括稀释培养法、高通量培养技术、模拟自然环境的扩散盒技术、土壤基质膜装置、细胞微囊包埋技术等。此外, 本文还总结了通过改善微生物培养条件、设计开发新型的微生物培养基等方面取得的令人瞩目的进展。这些新颖培养技术和培养方法的出现, 显著提高了微生物的可培养性, 发现和鉴定了许多新的微生物物种, 极大地丰富了可培养微生物的多样性和微生物资源, 并为深入研究和开发微生物奠定了良好的资源研究基础。
The complete mitochondrial genome of the citrus red mite Panonychus citri (Acari: Tetranychidae): high genome rearrangement and extremely truncated tRNAs
Ming-Long Yuan, Dan-Dan Wei, Bao-Jun Wang, Wei Dou, Jin-Jun Wang
BMC Genomics , 2010, DOI: 10.1186/1471-2164-11-597
Abstract: The mitochondrial genome of P. citri is a typical circular molecule of 13,077 bp, and contains the complete set of 37 genes that are usually found in metazoans. This is the smallest mitochondrial genome within all sequenced Acari and other Chelicerata, primarily due to the significant size reduction of protein coding genes (PCGs), a large rRNA gene, and the A + T-rich region. The mitochondrial gene order for P. citri is the same as those for P. ulmi and Tetranychus urticae, but distinctly different from other Acari by a series of gene translocations and/or inversions. The majority of the P. citri mitochondrial genome has a high A + T content (85.28%), which is also reflected by AT-rich codons being used more frequently, but exhibits a positive GC-skew (0.03). The Acari mitochondrial nad1 exhibits a faster amino acid substitution rate than other genes, and the variation of nucleotide substitution patterns of PCGs is significantly correlated with the G + C content. Most tRNA genes of P. citri are extremely truncated and atypical (44-65, 54.1 ± 4.1 bp), lacking either the T- or D-arm, as found in P. ulmi, T. urticae, and other Acariform mites.The P. citri mitochondrial gene order is markedly different from those of other chelicerates, but is conserved within the family Tetranychidae indicating that high rearrangements have occurred after Tetranychidae diverged from other Acari. Comparative analyses suggest that the genome size, gene order, gene content, codon usage, and base composition are strongly variable among Acari mitochondrial genomes. While extremely small and unusual tRNA genes seem to be common for Acariform mites, further experimental evidence is needed.The family Tetranychidae (spider mites) (Chelicerata: Acari) includes ~1200 species, many of which are of agronomic importance [1], such as Tetranychus urticae, Panonychus citri, and P. ulmi; the former is a worldwide pest of many plant species including several economically important agricultural crops, whil
Image match algorithm based on hue component of color image
基于色调空间的彩色图像匹配算法*

LAN Hai-bin,WANG Ping,ZHAO Bao-jun,
兰海滨
,王平,赵保军

计算机应用研究 , 2009,
Abstract: Hue component of color image could provide more information in the application of color image match.Especially,the color constant character of hue could reduce the effect from fluctuation of intensity of environment light.It was also very important to select an available strategy in reference image.For the requirement of image match in the application of color image mosaic,this paper proposed an method of image match in the hue-saturation-value space.Then brought forward an hue sequential similarity detecti...
Design and implementation of preprocessor for spatial fine granularity scalable coding
空域精细可扩展编码预处理器的设计和实现

QIAO Bao-Jun,SHI Feng,WANG Yi-Zhuo,
乔保军
,石 峰,王一拙

计算机应用 , 2006,
Abstract: To apply Spatial Fine Granularity Scalable Coding(S-FGS) efficiently, a design and implementation of preprocessor was proposed. This scheme used small RAM to store frame data. Moreover, parallel and pipelined data could be effectively applicable to this scheme. The analysis based on the simulation of the preprocessor shows that the scheme can meet the functional and real-time requirements of S-FGS.
Population Genetics of Two Asexually and Sexually Reproducing Psocids Species Inferred by the Analysis of Mitochondrial and Nuclear DNA Sequences
Dan-Dan Wei, Ming-Long Yuan, Bao-Jun Wang, An-Wei Zhou, Wei Dou, Jin-Jun Wang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0033883
Abstract: Background The psocids Liposcelis bostrychophila and L. entomophila (Psocoptera: Liposcelididae) are found throughout the world and are often associated with humans, food stores and habitations. These insects have developed high levels of resistance to various insecticides in grain storage systems. However, the population genetic structure and gene flow of psocids has not been well categorized, which is helpful to plan appropriate strategies for the control of these pests. Methodology/Principal Findings The two species were sampled from 15 localities in China and analyzed for polymorphisms at the mitochondrial DNA (Cytb) and ITS (ITS1-5.8S-ITS2) regions. In total, 177 individual L. bostrychophila and 272 individual L. entomophila were analysed. Both Cytb and ITS sequences showed high genetic diversity for the two species with haplotype diversities ranged from 0.154±0.126 to 1.000±0.045, and significant population differentiation (mean FST = 0.358 for L. bostrychophila; mean FST = 0.336 for L. entomophila) was also detected among populations investigated. A Mantel test indicated that for both species there was no evidence for isolation-by-distance (IBD). The neutrality test and mismatch distribution statistics revealed that the two species might have undergone population expansions in the past. Conclusion Both L. bostrychophila and L. entomophila displayed high genetic diversity and widespread population genetic differentiation within and between populations. The significant population differentiation detected for both psocids may be mainly due to other factors, such as genetic drift, inbreeding or control practices, and less by geographic distance since an IBD effect was not found.
Distribution variance of suspended sediment concentration and scaling effect correction: eight neighborhood algorithm
悬浮泥沙浓度分布方差与尺度修正——八邻域算法

CHEN Jun,WANG Wei-Cai,WANG Bao-Jun,WEN Zhen-He,
陈军
,王伟财,王保军,温珍河

红外与毫米波学报 , 2010,
Abstract: 在归纳总结悬浮泥沙反演模型尺度效应研究现状的基础上,提出了基于八邻域窗口估算像元泥沙浓度分布方差算法,并利用该算法的计算结果,推导与计算了线性模型、对数模型和指数模型的尺度修正方法.结合太湖Landsat/TM影像数据和同步实测泥沙浓度数据及光谱数据的分析表明:悬浮泥沙浓度定量模型的尺度效应误差与模型密切相关.对于像太湖这样的复杂Ⅱ类水体,尺度效应可以导致反射率的相对误差达到16%.
Regional characteristic analysis of P-wave velocity and deep oil-gas in the northern Songliao basin
松辽盆地北部纵波速度区域特征分析及深层油气问题

LIU Yang,LIU Cai,YANG Bao-jun,WANG Dian,WANG Jian-min,WANG Zhao-hu,
刘洋

地球物理学进展 , 2008,
Abstract: In recent years,deep gas exploration in the Songliao basin has achieved a major breakthrough,so many scholars pay much attention to deep oil-gas exploration in this basin.Aiming at the deep oil-gas in the northern Songliao basin,wemake a new collection and analysis of the P-wave velocity data to describe,the structured characteristics of six artificial seismic profiles.Finally,we evaluate several faulted subsidences in the basin.This paper qualitatively shows certain credibility of the deep model.Through analyzing the deep strata distribution of the basin and discussing the relationship between deep strata and oil-gas with six long seismic profiles,we can obtain more comprehensive cognition,iWhich will be of guiding significance for further exploration of deep oil-gas.
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