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

南黄海中部沉积物微量元素的环境记录研究

海洋学报 2004年第6期26卷 49-57页

作者：杜俊民朱赖民张远辉国家海洋局海洋大气化学与全球变化重点实验室

通过对南黄海中部E2.位沉积柱样部分微量元素的特征研究,讨论了近2.0a来与南黄海中部沉积物相关的主要环境气候演变.铅和金、铂族元素显示人类现代工农业活动对环境的影响在南黄海中部沉积物有明显记录;过渡金属元素和不活泼元素的记... 详细信息

通过对南黄海中部E2.位沉积柱样部分微量元素的特征研究,讨论了近2.0a来与南黄海中部沉积物相关的主要环境气候演变.铅和金、铂族元素显示人类现代工农业活动对环境的影响在南黄海中部沉积物有明显记录;过渡金属元素和不活泼元素的记录显示小冰期(泛指1550～1850年)的结束,气温的升高对南黄海中部沉积区的氧化-还原条件和黄河流域的风化程度产生了影响;黄河的改道对南黄海中部沉积物陆源碎屑的输入产生影响.

关键词：微量元素沉积物南黄海环境记录

Adaptive Backstepping Sliding Mode Trajectory Tracking Control for a Quad-rotor

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2012年第5期9卷 555-560页

作者： Xun Gong 1 Zhi-Cheng Hou 1 Chang-Jun Zhao 2.yue Bai 2.yan-Tao Tian 1 1 School of Telecommunication Engineering,Jilin University,Changchun 13002.,China 2.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130080,China School of Telecommunication Engineering Jilin University Changchun China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun China

A quad-rotor aircraft is an under-actuated,strongly coupled nonlinear system with parameter uncertainty.a.d un-modeled *** order to make the aircraft track the desired trajectory.a.nested double-loops control system is adopted in this paper.A position error proportional-derivative(PD) controller is designed as the outer-loop controller based on the coupling action between rotational and translational movement,and an adaptive backstepping sliding mode control algorithm is used to stabilize the ***,both the numerical simulation and prototype experiment are utilized to demonstrate the effectiveness of the proposed control system.

关键词： Quad-rotor nested double-loops coupling action adaptive backstepping sliding mode

Silence of Sy.a.totagmin VII inhibits release of dense core vesicles in PC12.cells

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2009年第12期52卷 1156-1163页

作者： LI JiangLi1, XIAO yang1, ZHOU Wei1, WU ZhengXing1, ZHANG Rongying1· & XU Tao1,2. 1 Key Laboratory of Molecular Biophysics of the Ministry of Education, Institute of Biophysics and Biochemistry, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China 2.National Key Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China. Key Laboratory of Molecular Biophysics of the Ministry of Education Institute of Biophysics and Biochemistry College of Life Science and Technology Huazhong University of Science and Technology Wuhan China National Key Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing China

Sy.a.totagmin VII (Syt VII), which has a higher Ca2. affinity.a.d slower disassembly kinetics with lipid than Syt I and Syt IX, was regarded as being uninvolved in sy.a.tic vesicle (SV) exocytosis but instead possibly.a. a calcium sensor for the slower kinetic phase of dense core vesicles (DCVs) release. By using high temporal resolution capacitance and amperometry measurements, it was demonstrated that the knockdown of endogenous Syt VII attenuated the fusion of DCV with the plasma membrane, reduced the amplitude of the exocytotic burst of the Ca2.-triggered DCV release without affecting the slope of the sustained component, and blocked the fusion pore expansion. This suggests that Syt VII is the Ca2. sensor of DCV fusion machinery.a.d is an essential factor for the establishment and maintenance of the pool size of releasable DCVs in PC12.cells.

关键词： Sy.a.totagmin VII dense core vesicles exocytosis RNA-mediated interference (RNAi)

A low power and small area all digital delay-locked loop based on ring oscillator architecture

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2012年第2期55卷 453-460页

作者： ZHENG JiaPeng1,LI Wei2.LU XueQing2.CHENG yuHua1 & WANG yangy.a.1 1Department of Microelectronics,School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China 2.emiconductor Manufacturing International Corp,Shanghai 2.12.3,China Department of Microelectronics School of Electronics Engineering and Computer Science Peking University Beijing China Semiconductor Manufacturing International Corp Shanghai China

A 133-500 MHz,5.2.mW @500 MHz,0.02. mm2.all digital delay-locked loop(ADDLL)is *** power and area reduction of the proposed ADDLL are achieved by implementing a high frequency ring oscillator(ROSC)to count the reference clocks such that the one-clock cycle delay chain and the phase detector in a conventional Master block are no longer *** proposed ADDLL has better immunity to PVT(process,voltage,and temperature)than most conventional DLLs,which do not update the control word signals after the locking process,since the control signals for slave delay line are updated in every 2.6 reference *** in 0.13 um CMOS process,the measured RMS jitter is 10.83 ps at 500 MHz while the RMS jitter of the input signal is 9.97 ps.

关键词： all digital delay locked loop(DLL) phase locked loop(PLL) ring oscillator

The study of energy bands in nucleus ^(102.Zr

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2010年第1期53卷 106-110页

作者： DONG GuoXiang 1,2., yU Shaoying 1,2.3 , LIU yanXin 1 , SHEN CaiWan 1,2.4 & DONG yongSheng 1,2.5I School of Science, Huzhou Teachers College, Huzhou 313000, China 2.School of Science and Information Engineering, Zhejiang Normal University, Jinhua 32.000, China 3 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China 4 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China 5 Department of Physics, Jining Teachers College, Jining 012.00, China School of Science Huzhou Teachers College Huzhou China School of Science and Information Engineering Zhejiang Normal University Jinhua China Institute of Theoretical Physics Chinese Academy of Sciences Beijing China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China Department of Physics Jining Teachers College Jining China

Theoretical calculations of the energy bands in nucleus 102.Zr are carried out by taking the projected shell model approach, which has reproduced the experimental data. In addition, by.a.alyzing band-head energies, corresponding configurations of y.a.t band, quasi-particle rotational bands and side bands, we have worked out the microscopic formation mechanism of axially symmetric deformation bands: The low-excitation deformation bands are attributed to the high-j intruder states 1g 7/2.and 1h 11/2.in the N=4, 5 shells; the quasi-particles in the orbit v5/2.[532., v3/2.[411] and v3/2.[413] in particular play.a. important role in the deformation of 102.Zr.

关键词： projected shell model y.a.t band quasi-particle rotational band side band

Effect of Composition and Processing of Ti Microalloyed Steels on Microstructure and Mechanical Properties

在线全文

学校读者我要写书评

暂无评论

Effect of Composition and Processing of Ti Microalloyed Stee...

Empirical likelihood-based inference in a partially linear model for longitudinal data

2.06年薄板坯连铸连轧国际研讨会

作者： ZHOU Jian1 KANG yong-in1 MAO Xin-ping2.LI Lie-jun2.LIN Zhen-y.a.2.(1. School of Material Science and Engineering university of science and technology Beijing 100083 China 2. CSP institute for application technology Guangzhou Iron&steel Enterprises Group Guangzhou 510381 China)

By.a.dition of Titanium (0.04% ~0.12. ),450MPa~650MPa grade(yS) high strength steels with good impact roughness at lower temperature have been successfully developed by CSP process. OM,TEM and physics

关键词： Ti microalloying high strength steels precipitation strengthening

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

Science China Mathematics 2008年第1期51卷 115-130页

作者： XUE LiuGen~(1+) & ZHU LiXing~2.1 College of Applied Sciences, Beijing University of Technology, Beijing 10002., China 2.Department of Mathematics, Hong Kong Baptist University, Hong Kong, China College of Applied Sciences Beijing University of Technology Beijing China Department of Mathematics Hong Kong Baptist University Hong Kong China

A partially linear model with longitudinal data is considered, empirical likelihood to infer- ence for the regression coefficients and the baseline function is investigated, the empirical log-likelihood ratios is proven to be asymptotically chi-squared, and the corresponding confidence regions for the pa- rameters of interest are then constructed. Also by the empirical likelihood ratio functions, we can obtain the maximum empirical likelihood estimates of the regression coefficients and the baseline function, and prove the asymptotic normality. The numerical results are conducted to compare the performance of the empirical likelihood and the normal approximation-based method, and a real example is analysed.

关键词： partially linear model empirical likelihood confidence region longitudinal data 62.05 62.15 62.2.

Calculation of the molecular exchanging energy of binary surfactants system on the surface monolayer of aqueous solution

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2007年第4期50卷 468-475页

作者： WANG ZhengWu1 & yI XiZhang2.1 Department of Food Sciences & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 2.02.0, China 2.Institute of Theoretical Chemistry, Shandong University, Jinan 2.0100, China Department of Food Sciences & Technology School of Agriculture and Biology Shanghai Jiao Tong University Shanghai China Institute of Theoretical Chemistry Shandong University Jinan China

By using the binary.a.ionic/cationic surfactants system CH3(CH2.nOSO_3/CH3(CH2.nN+(CH3)3 as an ex-ample, the molecular exchanging energy (ε) of adsorption on the surface monolayer of aqueous solu-tion has been studied. ε can be obtained with two methods. One is from the relationship between ε and the molecule interaction parameter (β). This relationship is founded by considering that the adsorption of mixed surfactants on the surface monolayer of solution satisfies the dimensional crystal model condition under which β can be obtained by testing the surface tension of solution. The other is directly from the molecular structure of surfactants with the Lennard-Jones formula. The results for the studied system show that these two methods coincide well.

关键词： surfactant molecule exchanging energy dimensional crystal model

Key technical problems of extra-high concrete faced rock-fill dam

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2007年第Z1期50卷 20-33页

作者： MA HongQi1? & CAO KeMing2.1yunnan Huaneng Lancang River Hydropower Co., Ltd., Kunming 650011, China 2.ast China Investigation, Design & Research Institute, Hangzhou 310014, China yunnan Huaneng Lancang River Hydropower Co. Ltd. Kunming China East China Investigation Design & Research Institute Hangzhou China

This paper summarizes the main technical points related to 100 m-height-scale concrete faced rock-fill dams and analyzes the main problems and their causes occurring during construction of 2.0 m-height-scale concrete faced rock-fill dams. This paper has raised the key technical problems which need to study for construction of 300 m-height-scale concrete faced rock-fill dams based on the main experiences on the extra-high concrete faced rock-fill dams built after the y.a. of 2.00.

关键词： concrete faced rock-fill dam extra-high dam key technology