oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 260 )

2018 ( 8710 )

2017 ( 8729 )

2016 ( 9092 )

Custom range...

Search Results: 1 - 10 of 470094 matches for " <br>李锐锋 "
All listed articles are free for downloading (OA Articles)
Page 1 /470094
Display every page Item
Line-feature-based SLAM Algorithm
一种基于线特征的SLAM算法研究

HAN Rui,LI Wen-Feng,<br>韩,
自动化学报 , 2006,
Abstract: A line-feature based SLAM algorithm is presented in this paper to resolve the conflict between the requirements of computational complexity and information-richness within the pointfeature based SLAM algorithm, All operations required for building and maintaining the map, such as model-setting, data association, and state-updating, are described and formulated. This approach has been programmed and successfully tested in the simulation work, and results are shown at the end of this paper.
关于科技进步的道德思考
,杨杰
科技进步与对策 , 2000,
Abstract: 科技进步及其成果的应用不仅极大地改善了人的生活方式和交往方式,体现了其卓越的道德价值,而且还扩大了人们的道德视野,改变了旧的道德观念,为新的伦理道德的形成提供了前提条件。科技进步从根本上说有利于道德的进步,但科技成果如果被不负责任也误用、滥用,甚至恶用,就会给道德进步带来负面影响。只有进一步提高科研人员的道德素质和社会责任感,加强科技立法工作,才能把负面影响减少到最低限度。科技进步道德规范科技立法
Response of Climate and Hydrology Change to North Atlantic Oscillation and Arctic Oscillation in the West of Northern Xinjiang during the Last Fifty Years
北疆西部近50a来气候、水文变化趋势及其与北大西洋/北极涛动的关系

HAO Xing-ming,LI Cong,LI Wei-hong,ZHAO Rui-feng,<br>郝兴明,,卫红,
中国沙漠 , 2011,
Abstract: In this paper,based on the meteorological,river flow and NAO,AO time series data during the last fifty years,the change trends of temperature,precipitation and river flow and their response to North Atlantic Oscillation and Arctic Oscillation(NAO/AO) in the west of Northern Xinjiang were studied with methods of trend analysis,Mann-Kendall test and correlation analysis.The results showed that the annual average temperature and precipitation increased significantly with time in the study area during the last ...
Formation of the ligninolytic enzymes by Phanerochaete chrysosporium under various ammonium nitrogen concentrations
黄孢原毛平革菌在多种氨氮浓度下木质素降解酶的产生

YU Guoce,WEN Xianghu,LI Dongfeng,LI Rui,QIAN Yi,<br>喻国策,文湘华,,,钱易
环境科学学报 , 2003,
Abstract: Agitated submerged culture of Phanerochaete chrysosporium was carried out in air at ammonium nitrogen concentrations ranging from 0.0308 to 0.924g/L. Lignin peroxidase was detected within a range of nitrogen concentration from 0.0308 to 0.308g/L with the highest peak activity of 42.8U/L, and laccase between 0.0308g/L and 0.154g/L with the highest activity of 35.0U/L. At nitrogen concentrations of 0.154g/L and above, glucose consumption rates were comparable and evidently higher than that at 0.0308g/L, and ammonium nitrogen reached minimums when glucose was depleted and thereafter began to increase. Activity peaks of lignin peroxidase and laccase coincided with the maximum or nearly maximum consumption of glucose and nitrogen at nitrogen concentrations of 0.154g/L and above. The results would be of importance in the fermentation of the ligninolytic enzymes and the direct application of white rot fungi in environmental engineering.
Theoretical investigation of local structure for ZnF2:Ni2+ Crystal
ZnF:Ni晶体局域结构的理论研究"

FENG Wen-lin,CHEN Tai-hong,LI Tie,LI Rui-feng,<br>冯文林,陈太红,,
重庆邮电大学学报(自然科学版) , 2006,
Abstract: 从光谱和EPR数据出发,用完全对角化方法确定了ZnF:Ni 晶体中的23(4 515 键长与键角,证实了 ZnF:Ni晶体的局域结构畸变的存在%研究结果表明,ZnF:Ni晶体与/01( 基晶的结构参数对比,发现掺杂23(4 离子的ZnF:Ni晶体分别产生了沿. 轴的伸长畸变和在,平面的压缩畸变.光谱和,-.参量计算的理论值与实验值非常接近.
一种基于线特征的SLAM算法研究
,
自动化学报 , 2006,
Abstract: ?Aline-featurebasedSLAMalgorithmispresentedinthispapertoresolvetheconflictbetweentherequirementsofcomputationalcomplexityandinformation-richnesswithinthepoint-featurebasedSLAMalgorithm,Alloperationsrequiredforbuildingandmaintainingthemap,suchasmodel-setting,dataassociation,andstate-updating,aredescribedandformulated.Thisapproachhasbeenprogrammedandsuccessfullytestedinthesimulationwork,andresultsareshownattheendofthispaper.
Response of Desert Riparian Forest Vegetation to Groundwater Depth Changes in the Middle and Lower Tarim River
塔里木河中下游荒漠河岸林植被对地下水埋深变化的响应

HAO Xingming,CHEN Yaning,LI Weihong,ZHAO Ruifeng,ZHU Chenggang,<br>郝兴明,陈亚宁,卫红,,朱成刚
地理学报 , 2008,
Abstract: Based on the data collected from 74 vegetation plots and groundwater depth monitoring wells (2006 to 2007) in the middle and lower reaches of the Tarim River, the groundwater table was divided into six gradients (0-2, 2-4, 4-6, 6-8, 8-10 and >10 m) to compare the influence of groundwater level on coverage, plant diversity and plants appearance frequency. The results showed that plant diversity was the highest at the 2-4 m level, followed by 4-6 m and then 0-2 m. When the groundwater depth dropped to below 6 m species diversity decreased tremendously, and the slope of the Hill's index (diversity ordering) tended to level off. Thus, the optimum groundwater level for major plants growth is 2-4 m and the threshold groundwater depth is about 6 m. To restore vegetation and ecosystem of the lower reaches of the Tarim River, the groundwater depth must be kept at a minimum of 6 m.
CFD numerical simulation of integrated cyclonic and flotation unit used in produced water treatment
含油污水处理用旋流气浮一体化设备的CFD数值模拟

Han Xu,Chen Jiaqing,Li Ruifeng,Shang Chao,Wang Chunsheng,<br>韩旭,陈家庆,,尚超,王春升
环境工程学报 , 2012,
Abstract: 借助商业计算流体动力学(CFD)软件Fluent,对国内自主研发的含油污水处理用BIPTCFU-1型旋流气浮一体化设备进行内部流场的数值模拟研究,讨论了射流器挡板和缓流板等主要结构参数对设备分离性能的影响,并对污水处理量和回流比等运行参数对设备除油率的影响进行了评估。为下一步通过CFD数值模拟手段进行优化设计,进而成功研发含油污水旋流气浮一体化处理设备奠定了较为坚实的基础。
INVESTIGATION ON THE STRUCTURE AND ELEC TROCHEMICAL PROPERTIES OF SUPER-STOICH IOMETRIC Ti-Zr-V-Mn-Cr-Ni HYDROGEN STORAGE ELECTRODE ALLOYS
超化学计量比Ti-Zr-V-Mn-Cr-Ni贮氢电极合金相结构及电化学性能研究

ZHU Yunfeng,LI Rui,GAO Mingxia,LIU Yongfeng,PAN Hongge,WANG Qidong,<br>朱云峰,,高明霞,刘永,潘洪革,王启东
金属学报 , 2003,
Abstract: The structure and electrochemical properties of the super-stoichiometric Ti-based hydrogen storage alloys (Ti0.8Zr0.2)(V0.533Mn0.107Cr0.16Ni0.2)x (x=2, 3, 4, 5, 6) have been studied. It is found by XRD and EDS analysis that these alloys all mainly consist of two phases: a C14 type Laves phase with hexagonal structure and a V-based solid solution phase with bcc structure. The lattice parameters and unit cell volumes of the two phases all decrease with increasing x. The electrochemical studies show that the maximum discharge capacity, the discharge potential, the high rate dischargeability (HRD), the cyclic stability, the exchange current density Io and the limiting current density IL of the alloys all increase with increasing x from 2 to 5. When x reaches 6, the discharge potential, HRD and cyclic stability are still increasing proportionately, while the maximum discharge capacity, I0 and IL all decrease. Furthermore, the alloy electrodes become more difficult to be activated for the higher stoichiometric alloys.
EFFECT OF ZIRCONIUM CONTENT ON PRECIPITATION OF SILICIDE IN TI-1100 ALLOY
Zr含量对Ti-1100合金中硅化物析出的影响

XU Feng,LI Geping,YANG Rui,M Varlioglu,P Nash,<br>徐,阁平,,M. Varlioglu,P. Nash
金属学报 , 2006,
Abstract: Morphology and distribution of silicide in Ti-1100 alloy with different zirconium content were observed by TEM. Isopleth at 0.76% (atomic fraction) Si in the Ti-Zr-Si system for pseudo Ti-1100 alloy was deduced according to the TEM results, isothermal sections of Ti-Zr-Si system phase diagram and concerned references. Both the TEM observation and the isopleths show that the silicide solvus increases and solubility of silicon in titanium declines as Zr content increased. These changes resulted in silicide coarsening,silicide volume fraction increasing and precipitation position changing.
Page 1 /470094
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.