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Search Results: 1 - 10 of 39814 matches for " CAI Liang-hou "
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Plankton found in ballast waters of foreign ships harboring in ports of Southeast China
中国东南沿海港口外轮压舱水生物的调查

YANG Qing-liang,CAI Liang-hou,GAO Ya-hui,SU Zhan,CHEN Chang-ping,LIN Geng-ming,HUANG Mei-zhen,LI Bing-qian,XIANG Peng,XU Cui-ya,ZHENG Hui-dong,LIANG Jun-rong,XING Xiao-li,FANG Min-jie,
杨清良
,蔡良候,高亚辉,苏展,陈长平,林更铭,黄美珍,李炳乾,项鹏,许翠娅,郑惠东,梁君荣,邢小丽,方民杰

海洋科学 , 2011,
Abstract: Seventeen foreign ships (including 8 container ships and 9 bulks) entering ports in coast of southeast of China were randomly selected as the monitoring objects. Temperature, salinity, abd plankton species diversity and abundance in the ballast waters were measured. At least 309 taxa from seven plant phyla and five animal phyla were found. The distribution characteristics and survival states of organisms were correlated with the age and salinity of ballast waters. Release of ballast water from ships is a major vector for the introduction of exotic aquatic species. Results of this study indicate that the potential risk for organisms invasion from ballast waters discharged from foreign bulk Carriers harboring in coasts of Southeast China should receive greater attention than those from foreign container vessels.
EFFECT OF TIG SURFACE REMELTING PROCESS ON CAVITATION EROSION RESISTANCE FOR A PRE-WELD BUILDUP LAYER
TIG表面重熔对堆焊层耐空泡腐蚀的影响

LEI Yu-cheng,FENG Liang-hou,ZHAO Xiao-jun,
雷玉成
,冯良厚,赵晓军

腐蚀科学与防护技术 , 2007,
Abstract: A surface layer of cavitation resistant material preprepared by buildup welding on a carbon steel 4020 by MIG process, and which was then remelt by TIG process. Compared with the conventional post grinding process for the weld layer, the effect of TIG surface remelting process on cavitation erosion resistance was investigated. The results show that after 45h of cavitation erosion test, the mass loss of the specimen with ground surface was 1.57 times of that with TIG remehed surface. The fracture of martensite, which was transformed from austenite of the weld steelite 21 layer was the main form of mass loss during cavitation erosion process. TIG surface remelting treatment might delay the transformation process to certain degree and thus decreased mass loss. TIG remelting process might also suppress the extention process of crack so that to eliminate spalling off of fragements.
Impacts of Melt Spinning and Element Substitution on Electrochemical Characteristics of the La–Mg–Ni-based A2B7-Type Alloys  [PDF]
Yang-huan Zhang, Hong-wei Shang, Ying Cai, Zhong-hui Hou, Guo-fang Zhang, Dong-liang Zhao
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B022
Abstract: The partial substitution of Zr for La has been performed in order to ameliorate the electrochemical hydrogen storage performances of La–Mg–Ni based A2B7-type electrode alloys. The melt spinning technology was used to prepare the La0.75-xZrxMg0.25Ni3.2Co0.2Al0.1 (x=0, 0.05, 0.1, 0.15, 0.2) electrode alloys. The impacts of the melt spinning and the substituting La with Zr on the structures and the electrochemical hydrogen storage characteristics of the alloys were systemically investigated. The analysis of XRD and TEM reveals that the as-cast and spun alloys have a multiphase structure, composing of two main phases (La, Mg)2Ni7 and LaNi5 as well as a residual phase LaNi2. The electrochemical measurement indicates that both the substitution of Zr for La and the melt spinning ameliorate the electrochemical cycle stability of the alloys dramatically. Furthermore, the high rate discharge ability (HRD) of the as-spun (10 m/s) alloys notably declines with growing the amount of Zr substitution, while it first augments and then falls for the (x=0.1) alloy with rising the spinning rate.
DNA barcoding of 18 species of Bovidae
YanSen Cai,Liang Zhang,FuJun Shen,WenPing Zhang,Rong Hou,BiSong Yue,Jing Li,ZhiHe Zhang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4302-1
Abstract: Genetic divergences of mitochondrial cytochrome c oxidase subunit I genes, known as DNA barcodes, have been used in species identification in the animal kingdom. Barcodes can assist field workers and taxonomists to determine groups in need of taxa analysis, and facilitate the recognition of appropriate populations and scales for conservation planning. In this study, 18 species of Bovidae were selected to evaluate the effectiveness of DNA barcoding for species differentiation. The results showed that all but 2 species had unique DNA barcodes. The mean intraspecific variation was 0.63%, yielding a threshold of 6.3% for flagging putative species. The results supported the inference that barcode variation within species of mammals is somewhat higher than within other animal groups. The present study validated the effectiveness of barcoding for the identification of bovid species.
DNA barcoding of 18 species of Bovidae

YanSen Cai,Liang Zhang,FuJun Shen,WenPing Zhang,Rong Hou,BiSong Yue,Jing Li,ZhiHe Zhang,

科学通报(英文版) , 2011,
Abstract: Genetic divergences of mitochondrial cytochrome c oxidase subunit I genes, known as DNA barcodes, have been used in species identification in the animal kingdom. Barcodes can assist field workers and taxonomists to determine groups in need of taxa analysis, and facilitate the recognition of appropriate populations and scales for conservation planning. In this study, 18 species of Bovidae were selected to evaluate the effectiveness of DNA barcoding for species differentiation. The results showed that all but 2 species had unique DNA barcodes. The mean intraspecific variation was 0.63%, yielding a threshold of 6.3% for flagging putative species. The results supported the inference that barcode variation within species of mammals is somewhat higher than within other animal groups. The present study validated the effectiveness of barcoding for the identification of bovid species.
A Probabilistic Characterization of g-Harmonic Functions
Liang Cai
Mathematics , 2011,
Abstract: This paper gives a definition of g-harmonic functions and shows the relation between the g-harmonic functions and g-martingales. It's direct to construct such relation under smooth case, but for continuous case we need the theory of viscosity solution. The results show that under the nonlinear expectation mechanism, we also can get the similar relation between harmonic functions and martingales. Finally, we will give a result about the strict converse problem of mean value property of g-harmonic functions.
Combination of Hot/Cold Wires for Non-Isothermal Flow Measurements
热线与冷线相结合的非绝热流动测量技术

LIU Ming-hou,ZHANG Xian-feng,CHEN Yi-liang,CAI Xiao-dan,
刘明侯
,张先锋,陈义良,蔡晓丹

实验力学 , 2004,
Abstract: 本文采用热线与冷线相结合的技术研究非绝热流动问题,提出了用冷线测量当地温度,并修正热线测量数据,以消除速度探头的温度影响,同时还可以给我们提供流场的平均温度及其脉动,以及温度通量等参数。该技术使得热线用于非绝热流动场测试,特别是对温度脉动或温度梯度较大的流动场精确测试变得容易。
Comparison of the Effects of Different Low Temperature Stresses on the Induction of the Cyanide-Resistant Alternative Pathway and the Expression of Alternative Oxidase in Tobacco Callus
不同低温胁迫对烟草愈伤组织抗氰交替途径诱导和交替氧化酶表达影响的比较

YAN Ying-Cai LIN Hong-Hui LIANG Hou-Guo ZHANG Nian-Hui,
晏婴才
,林宏辉,梁厚果,张年辉

植物学报 , 2004,
Abstract: 比较了不同低温(14℃和4℃)胁迫对烟草(Nicotiana rustica L.)愈伤组织抗氰交替途径诱导和交替氧化酶表达的影响。结果显示,不同低温胁迫处理能显著诱导烟草愈伤组织交替途径容量和实际运行的增加,且都呈现出基本相同的变化模式:在胁迫的初期(1~3 d)持续增加,在3 d时达到最高,而后下降到一个相对恒定的水平。但交替途径容量增加的幅度与温度下降的程度密切相关,而交替途径实际运行量的诱导程度在不同低温胁迫下的差异却很小。表明交替途径容量和实际运行对低温胁迫的响应是不同的。免疫印迹分析结果表明:低温胁迫明显诱导了交替氧化酶总蛋白的增加,且其随低温胁迫进程的变化与交替途径容量的变化基本一致;而对交替氧化酶单体与二聚体在低温胁迫下的含量变化检测结果则显示,烟草愈伤组织中交替氧化酶主要以二聚体形式存在,且这一存在形式并不随低温胁迫程度的加深而发生改变。两种形式的交替氧化酶蛋白含量都能被低温胁迫诱导增加,但其单体水平在两种不同的低温胁迫下并无明显差别,而4℃低温胁迫诱导的二聚体交替氧化酶蛋白含量明显高于14℃。表明不同程度低温对抗氰交替途径发生的不同影响主要是由于对交替氧化酶蛋白二聚体形式的不同诱导程度所致;而高活性的交替氧化酶单体形式则不因低温胁迫程度的加重而被明显诱导升高,使得抗氰交替途径的运行程度在两种不同的低温胁迫处理条件下无显著差异。
Improved multi-objective genetic algorithm based on NSGA-II
基于NSGA-II的改进多目标遗传算法

CHEN Xiao-qing,HOU Zhong-xi,GUO Liang-min,LUO Wen-cai,
陈小庆
,侯中喜,郭良民,罗文彩

计算机应用 , 2006,
Abstract: Based on the study and analysis of NSGA-II algorithm, a new initial screening mechanism was designed, coefficient generating of crossover arithmetic operator was improved and more reasonable crowding mechanism was proposed. In this way, convergence was speeded up and its precision was improved. The testing results by representative applied functions show that with the improvements higher computational efficiency and more reasonable distributed solution can be obtained, and diversified distribution of the solutions can be maintained.
Asteroseismic based estimation of the surface gravity for the LAMOST giant stars
Chao Liu,Min Fang,Yue Wu,Li-Cai Deng,Liang Wang,Wei Wang,Jian-Ning Fu,Yong-Hui Hou,Guang-Wei Li,Yong Zhang
Physics , 2014,
Abstract: Asteroseismology is one of the most accurate approaches to estimate the surface gravity of a star. However, most of the data from the current spectroscopic surveys do not have asteroseismic measurements, which is very expensive and time consuming. In order to improve the spectroscopic surface gravity estimates for a large amount of survey data with the help of the small subset of the data with seismic measurements, we set up a support vector regression model for the estimation of the surface gravity supervised by 1,374 LAMOST giant stars with Kepler seismic surface gravity. The new approach can reduce the uncertainty of the estimates down to about 0.1 dex, which is better than the LAMOST pipeline by at least a factor of 2, for the spectra with signal-to-noise ratio higher than 20. Compared with the logg estimated from the LAMOST pipeline, the revised logg values provide a significantly improved match to the expected distribution of red clump and RGB stars from stellar isochrones. Moreover, even the red bump stars, which extend to only about 0.1 dex in logg, can be discriminated from the new estimated surface gravity. The method is then applied to about 350,000 LAMOST metal-rich giant stars to provide improved surface gravity estimates. In general, the uncertainty of the distance estimate based on the SVR surface gravity can be reduced to about 12% for the LAMOST data.
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