检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

从千层塔中微波协助提取石杉碱甲和石杉碱乙

中国生物工程杂志 2004年第11期24卷 87-89页

作者：查圣华李秀男孙海虹陈婷林海苏志国北京科技大学土木与环境工程学院北京100083 中国科学院过程工程研究所生化工程国家重点实验室

首先从 8种溶剂中筛选出硫酸作为微波协助提取的浸提溶剂 ,然后用正交试验确立了千层塔生物碱的最佳提取条件。以石杉碱甲和石杉碱乙回收率为指标 ,考察了溶剂倍数、溶剂浓度、微波处理时间等因素。结果表明 ,在室温下微波协助提取的最... 详细信息

首先从 8种溶剂中筛选出硫酸作为微波协助提取的浸提溶剂 ,然后用正交试验确立了千层塔生物碱的最佳提取条件。以石杉碱甲和石杉碱乙回收率为指标 ,考察了溶剂倍数、溶剂浓度、微波处理时间等因素。结果表明 ,在室温下微波协助提取的最优条件为 :酸浓度 0 8% (v v) ,液固比例 2.5∶1 ,微波处理时间 90s。 3次重复实验所得石杉碱甲和石杉碱乙回收率分别是 93 7%和 93 9% ,相对标准偏差分别为 1 79%和 1 5 6% (n =3)。与传统的回流提取工艺相比 ,过程时间从 2.缩短为 90s,回收率提高了 1 0 %以上。

关键词：石杉碱甲微波处理千层塔取石最佳提取条件回流提取生物碱溶剂硫酸工艺

Real-Time Integrated Multi-Object Detection and Tracking in Video Sequences Using Detection and Mean Shift Based Particle Filters

在线全文

学校读者我要写书评

暂无评论

Real-Time Integrated Multi-Object Detection and Tracking in ...

The Emission Heights of Transition Region Lines in an Equatorial Coronal Hole and the Surrounding Quiet Sun

2.10 IEEE 2.d Symposium on Web Society

作者： Yuanyuan Jia Bioengineering Department university of Illinois at Chicago Chicago,IL 60607 Wei Qu School of Information Science and Engineering graduate Univ.of the {2. academy of Sciences beijing,china 100190

＜正＞Object detection and tracking have been studied separately in most *** paper presents a new method integrating generic object detection with particle filtering based tracking algorithm in one consistent framework to achieve real time robust multi-object tracking（MOT） in video *** using detection,we can not only do initialization automatically and dynamically,but also solve the data association problem for MOT *** improve the degeneracy problem which most particle filtering methods suffer with,we incorporate the strength of resampling, proposed detection based optimal importance function, and mean shift mode seeking together to make particles much more efficient and estimate the posterior density *** detection result gives the global optimal of the posterior density while the mean shift mode seeking finds the local *** results show the superior performance of our approach to the available tracking methods.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

chinese Journal of Astronomy and Astrophysics 2008年第6期8卷 732-742页

作者： Hui Tian Li-Dong Xia Jian-Sen He Bo Tan Shuo Yao Department of Geophysics Peking University B eijing 100871 China Max-Planck-Institut fur Sonnensystemforschung D-37191 Katlenburg-Lindau Germany School of Space Science and Physics Shandong Univ. at Weihai Weihai 264209 China

Using the correlation between the radiance or Doppler velocity and the extrapolated magnetic field, we determined the emission heights of a set of solar transition region lines in an equatorial coronal hole and in the surrounding quiet Sun region. We found that for all of the six lower-transition-region lines, the emission height is about 4-5 Mm in the equatorial coronal hole, and around 2.Mm in the quiet Sun region. This result confirms the previous findings that plasma with different temperature can coexist at the same layer of transition region. In the quiet Sun region, the emission height of the upper-transition-region line Ne VIII is almost the same that of the lower-transition-region line, but in the coronal hole, it is twice as high. This difference reveals that the outflow of Ne VIII is a signature of solar wind in the coronal hole and is just a mass supply to the large loops in the quiet Sun.

关键词： Sun: transition region Sun: magnetic fields Sun: solar wind Sun: UV radiation

The Intramolecular Coupling Reaction of 1,6-Bis(1-Alky1-2.Methylindol-3-yl)hexane-1,6-dione Induced by Low-valent Titanium

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 1997年第1期8卷 7-8页

作者： Zhen Nian HUANG Sheng JIN Mei Gong FAN(State Key Laboratory of Elemento-Organic Chemistry, Nankai university, Tianjin 300071, 2.Department ofChemistry, Peking university, {2. 100871, 3. Institute of Photographic Chemistry, Academ Sciences Sinica Bei State Key Lab. Elemento-Organ. Chem. Nankai University Tianjin 300071 China Department of Chemistry Peking University Beijing 100871 China Institute of Photographic Chemistry Academ Sciences Sinica Beijing 100101 China

The intramolecular reductive coupling reaction of 1,6-bis(subshtuted indolyl)hexane-1,6-dione using zero-valent titanium reagent as catalyst proderes the novel photochromic 1,2.diheterocyclic cyclohexenes 2. together ... 详细信息

关键词： The Intramolecular Coupling Reaction of 1,6-Bis Alky1-2.Methylindol-3-yl)hexane-1,6-dione Induced by Low-valent Titanium

在线全文

学校读者我要写书评

暂无评论

Linux目标代码内核补丁的机理和应用

计算机工程与应用 2004年第32期40卷 121-123,180页

作者：胡勇其匡先锋侯紫峰中国科学院计算技术研究所中国科学院研究生院北京100083 联想研究院

该文介绍了基于目标代码(二进制编译文件)为Linux运行时系统内核内存映像打补丁以修改内核的原理和方法,并给出了一个示例场景和程序以说明其应用。掌握该方法对于内核开发、系统调试和系统安全都具有重要的实用价值。

关键词：内核补丁 Linux 目标代码

New evidence Ⅱ for MDD model of thermal evolution history of Gangdese batholith

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第8期44卷 736-739页

作者： CHEN Wenji , LI Qi , HAD Jie , ZHOU Xinhua and SUN Min Institute of Geology, china Seismological Bureau, beijing 10002., china Institute of Geology , chinese academy of Sciences , beijing 10002., china Department of Karth Sciences , Hong Kong university , Hong Kong , china

The cooling curves are obtained using specific 40Ar/39Ar stage heating procedure and MDD modeling. In addition to the results of dating hornblende (K-Ar) and apatite (FT), the widespread existence of rapid cooling events has further been confirmed. A new knowledge of the starting time of Gangdese overthrust faulting in the east of Zedang, which was earlier in south and later in north is acquired.

关键词： Tibet thermal history multiple diffusion domain model.

Collective Rotational Bands in Transfermium Nuclei

在线全文

学校读者我要写书评

暂无评论

Collective Rotational Bands in Transfermium Nuclei

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： Xiao-tao He~(1 1)) Zhong-zhou Ren~2.Shu-xin Liu~3 En-guang Zhao~4 Jin-yan Zeng~3 1(College of Material Science and Technology,Nanjing university of Aeronautics and Astronautics,Nanjing 2.0016,china) 2.Department of Physics,Nanjing university,Nanjing 2.0093,china) 3(School of Physics,Peking university,beijing 100871,china) 4(Institute of Theoretical Physics,chinese academy of Sciences,beijing 100080,china)

Rotational bands in even-even nuclei Fm,No,No and odd-A nuclei No, Md are studied by the cranked shell model with particle-number conserving treatment for monopole and quadrupole pairing *** bands are reproduced very well by theoretical results.A backbending of kinematic moment of inertia（?） is predicted at（?）≈0.2.5,0.300 MeV,0.2.5 MeV in bands of No,No and No,*** detailed information about the contribution to alignment from each cranked single particle level exhibits that the backbendings in No,No are mainly due to the rapidly aligned angular momentum of proton 1j[770]1/2.pairs and neutron 2.[761]3/2.1j[734]9/2.pairs the band crossing,and that in No is attributed to the simultaneous alignment of neutron 2.（1/2.761]） and proton 1j（1/2.770]） *** one signature band was observed in *** predict its signature partner band with a sharp backbending at very low frequency of（?）w≈0.15 *** of（?） in Md are the consequence of crossing between the proton 1/2.52.]and 1/2.770]*** sudden rise of（?） is mainly due to the large alignment of proton 1/2.770]pair.

关键词： High-j intruder orbital Transfermium nuclei Backbending Cranked shell model Moment of inertia

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

用字典法压缩数据仓库数据方案

计算机工程与应用 2002年第16期38卷 141-142,231页

作者：张棱洪岩左春中国科技大学计算机系合肥230027 中国科学院软件研究所北京100080

数据仓库中的数据量是呈几何级数增长的。数据量的急剧增长严重影响数据仓库系统的性能,降低数据库系统的查询效率。文章在分析数据仓库数据特性的基础上,提出了使用字典法压缩数据仓库数据的方案。在对数据进行压缩的同时,也极大地改... 详细信息

数据仓库中的数据量是呈几何级数增长的。数据量的急剧增长严重影响数据仓库系统的性能,降低数据库系统的查询效率。文章在分析数据仓库数据特性的基础上,提出了使用字典法压缩数据仓库数据的方案。在对数据进行压缩的同时,也极大地改善了数据库系统的性能。

关键词：字典法数据仓库数据压缩数据库系统

Effect of early hyperbaric oxygen treatment on prevention of disorder of coagulation-fibrinolysis systems in rabbits with steroid-induced avascular necrosis of the femoral head

在线全文

学校读者我要写书评

暂无评论

Effect of early hyperbaric oxygen treatment on prevention of...