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商业经济与管理 2009年第10期 46-52,72页

作者：黄满盈邓晓虹首都师范大学经济管理系北京100089 对外经济贸易大学国际经贸学院北京100029

文章根据1980-2.07年的数据对价格贸易条件、收入贸易条件与经济增长之间的关系进行了经验分析,研究结果表明:贸易条件调整的实际GDP指标分析表明,从总体上看,价格贸易条件变化对我国的经济增长产生了负效应;协整分析的结果表明,经济增... 详细信息

文章根据1980-2.07年的数据对价格贸易条件、收入贸易条件与经济增长之间的关系进行了经验分析,研究结果表明:贸易条件调整的实际GDP指标分析表明,从总体上看,价格贸易条件变化对我国的经济增长产生了负效应;协整分析的结果表明,经济增长与价格贸易条件、收入贸易条件之间存在着稳定的长期均衡关系,价格贸易条件和收入贸易条件对经济增长都存在正向的影响;Granger因果检验、脉冲响应和方差分解也都验证了协整分析的结果。最后,根据实证分析的结果,提出了相应的对策建议。

关键词：价格贸易条件收入贸易条件经济增长

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GPS TEC response to the 2. July 2.09 total solar eclipse in East Asia

GPS TEC response to the 22 July 2009 total solar eclipse in ...

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中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Feng Ding,Weixing Wan,Baiqi Ning,Libo Liu,Huijun Le,Guirong Xu, Min Wang,Guozhu Li,Yiding Chen,Zhipeng Ren,Bo Xiong,Lianhuan Hu, Xinan Yue,Biqiang Zhao,Fengqin Li,and Min Yang 1 beijing National Observatory of Space Environment,Institute of Geology and Geophysics,Chinese academy of Sciences,beijing,{3.. 2.Institute of Heavy Rain,{3. Meteorological Administration, Wuhan,{3.. 3.Institute of Earthquake Science,{3. Earthquake Administration, beijing,{3.. 4 graduate school of the Chinese academy of Sciences,beijing,{3.. 5 University Corporation for Atmospheric Research,Boulder,Colorado, USA.

[1]The longest total solar eclipse of this century occurred in East and South Asia on 2. July *** eclipse was accompanied with a medium magnetic storm,whose main phase onset occurred～2. min after the passage of the Moon’s umbral *** TEC data from 60 GPS stations,we construct differential TEC maps to investigate the ionosphere response to the solar eclipse in central china in the range of 2.°N-3.°N, 108°E-118°E(i.e.,the magnetic latitude 15°N-2.°N).During the eclipse’s totality,a "shadow" in the ionosphere shown as TEC depletion area was formed～100 km south of the Moon’s umbral path with a maximum decrease of 5 *** TEC depletion area moved eastward,following the movement of the totality area with a time lag of～10 min. Enhancements of TEC due to the storm are observed after the main phase *** relative drop of TEC due to the solar eclipse is evidently larger at lower latitudes than that at higher ones and around noontime than that in the *** modeling work,we find that the latitudinal dependence of the TEC response may result from latitudinal variation of magnetic inclination,which influences the diffusion of ionization among different ***,the local time dependence of TEC response is closely related to the local time variation of background atmosphere density,which affects the electron loss efficiency in the ionosphere.

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An Econometric Modeling Approach to Short-term Crude Oil Price Forecasting

An Econometric Modeling Approach to Short-term Crude Oil Pri...

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第三十届中国控制会议

作者： LI Weiqi~1,MA Linwei~2.DAI Yaping~1 LIU Pei~2.1.school of Automation,{3. Institute of Technology University,{3. 100081,P.R.china 2.State Key Laboratory of Power Systems,Department of Thermal Engineering,Tsinghua-BP Clean Energy Center, Tsinghua University,{3. 100084,P.R.china

＜正＞In the competitive petroleum markets,oil price forecasting is becoming increasingly relevant to producers and *** paper develops a structural econometric model of the Brent crude spot price using the explanatory variable of defined relative inventory and OPEC production to analyze and forecast short-run oil price.A Hodrick-Prescott filter method presented obtains the relative inventory variables caused by the short-run supply and demand fluctuations in the crude oil market.A case study using the proposed method is provided,and the results indicate that the model developed in this work is helpful to industry and government in making oil-related decisions and investigating the changes in inventory and OPEC production on price.

关键词： Crude Oil Price Econometric Model Forecasting

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b→ssin a Vector Quark Model

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Communications in Theoretical Physics 2005年第11期44卷 887-890页

作者： CAI Hai-Ying ZHANG Da-Xin Institute of Theoretical Physics,school of Physics,Peking University,beijing 100871,{2.

The rare decay b→ss(?) is studied in a vector quark model by adding the contributions from exoticvector-like *** find that the contribution from box diagrams amounts to 10-9in the branching ratio,while theZ-mediated ... 详细信息

关键词： rare decay vector-like quarks

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Resibufogenin induces apoptosis and the G2.M cell cycle arrest of human HeLa cells

Resibufogenin induces apoptosis and the G2/M cell cycle arre...

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遗传学进步与人口健康高峰论坛

作者： Junzheng Yang~1 Baiyan Wu~1 Yixiu Xiao~2.Hongye Liang~1 Chuanshe Wang~3.Haihao Zhu~4 Dean Guo~3.(1.Department of Medical Genetics,Peking University Health Science Center beijing 100083.china 2.{2. of Public Health and Family Medicine, Capital Medical University.beijing I00083.P.R.china 3.The State Key Laboratory of Natural and Biomimetic Drugs,Peking University beijing 100083.china 4.Neuroscience Research Institute,Peking University,beijing 100083.china)

Resibufogenin,one of the components of bufadienolides in the traditional Chinese medicine,chan’su,was reported to exert cytotoxic activity on PLC/PRF5 cells and growth-inhibitory activities on 1L-6-dependent MH-60 cells,but the underlying mechanism remains largely *** investigated the changes of HeLa cells treated with different concentrations and different time courses of resibufogenin,by employing MTT assay,electron microscopy,DNA fragmentation analysis,flow

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Variation of Non-Metallic Inclusions Composition in X80 Pipeline Steel Refined by High Basicity Slag

Variation of Non-Metallic Inclusions Composition in X80 Pipe...

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第六届国际低合金高强度钢会议

作者： LI Qiang~1,WANG Xin-hua~1,LI Hai-bo~2.HUANG Fu-xiang~1, YANG Jun~1,WANG Wan-jun~1 (1.school of Metallurgical and Ecological,University of Science and Technology beijing,beijing 100083.china 2.Shousteel Research Institute,beijing 10003.,china)

The transformation of inclusions was studied when control technology of refining top slag in ladle furnace was used in X80 pipeline *** amount of aluminum was added to experimental heats for final deoxidation during BOF tapping,and then the refining top slag with high basicity and strong reducibility was adopted to transform AlO to inclusions with low melting *** results show that the composition of inclusions changes in order of"AlO→MgO-AlO system→CaO-MgO-AlO system→CaO-AlO system".And the inclusions after LF refining are liquid or semi-liquid state at the temperature of steelmaking,which are easily removable to obtain high cleanliness steel by collision,agglomeration and flotation.

关键词： transformation of inclusions high basicity top slag removal of inclusions X80 pipeline steel

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巴山山地退耕地植被自然恢复过程及物种多样性变化

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中国水土保持科学 2010年第2期8卷 99-104页

作者：魏振荣肖云丽李锐中国科学院水利部水土保持研究所西北农林科技大学陕西杨凌712100 中国科学院研究生院北京100049

巴山山地是我国南北方过渡地区,亦是长江重要的水源涵养区,探讨该地区退耕地植被自然恢复演替过程及其物种多样性的变化规律,对于指导该地区的人工植被建设具有重要的理论价值与实际意义。采用时空互代法对巴山山地退耕地植被自然恢复... 详细信息

巴山山地是我国南北方过渡地区,亦是长江重要的水源涵养区,探讨该地区退耕地植被自然恢复演替过程及其物种多样性的变化规律,对于指导该地区的人工植被建设具有重要的理论价值与实际意义。采用时空互代法对巴山山地退耕地植被自然恢复过程及其物种多样性变化进行研究,结果表明:1)巴山山地退耕地植被演替依次经过1年生植被草本群落、多年生草本群落、杂灌草群落及以栓皮栎、橿子栎或栓皮栎为建群种的阔叶林群落等不同阶段,形成地带性植物群落大致需要40～50 a;2.物种多样性会随立地环境的变化有所差异,阴坡的各物种多样性指标明显高于阳坡,但其变化规律基本一致。演替初期,植被群落的物种数、Shannon-wiener指数、Simpson指数和Pielou指数相对较低,随着植被群落演替的进行,各指标均呈波浪上升趋势;当植被恢复2. a时,各多样性指数均达到最大,分别为2.、2.5、0.89和0.8;到地带性植物群落阶段时,其各物种多样性指标又略有降低并趋于稳定。该结论对于充分利用植被自然恢复进行生态改善,并根据植被演替进程采取相应的人工管理措施具有重要的指导意义。

关键词：植被自然恢复演替物种多样性退耕地巴山

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Maximum Principle for Partially Observed Optimal Control of Backward Doubly Stochastic Systems

Maximum Principle for Partially Observed Optimal Control of ...

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第三十届中国控制会议

作者： ZHU Qingfeng~(1,2.,WANG Tianxiao~2.SHI Yufeng~2.1.{3. of Statistics and Mathematics,Shandong University of Finance,Jinan 2.0014,P.R.china 2.{3. of Mathematics,Shandong University,Jinan 2.0100,P.R.china

＜正＞The partially observed control problem is considered for backward doubly stochastic systems with control entering into the diffusion and the *** maximum principle is proved for the partially observable optimal control problem.A pure probabilistic approach is used,and the adjoint processes are characterized as solutions of related forward doubly stochastic differential equations in finite-dimensional *** of the derivation is identified with that of the completely observable ***,our theoretical result is applied to study a partially-observed linear-quadratic optimal control problem for a backward doubly stochastic system.

关键词： Backward doubly stochastic system Partially observed optimal control Maximum principle Adjoint equation

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Influence of nuclear physics inputs on the Th/U chronometer

Influence of nuclear physics inputs on the Th/U chronometer

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第十四届全国核物理大会暨第十届会员代表大会

作者： Zhongming Niu1 Baohua Sun2.3.Jie Meng1 2.4 1 State Key Laboratory of Nuclear Physics and Technology, school of Physics, Peking University, {3. 100871, People’s Republic of{2. 2.school of Physics and Nuclear Energy Engineering, Beihang University, {3. 100191, People’s Republic of{2. 3.Justus-Liebig-Universit?t Giessen, Heinrich-Buff-Ring 14, D-3.3.2.Giessen, Germany 4 Department of Physics, University of Stellenbosch, Stellenbosch, South Africa

The productions of thorium and uranium are key ingredients in r-process *** the combination of improved nuclear and stellar data,we have made a detailed investigation of the r-process abundance pattern in the very met... 详细信息

关键词： chronometer r-process nuclear masses metal-poor stars

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Observer Based Delay-Dependent Robust H∞ Control of Nonlinear Uncertain Systems with State and Input Delays

Observer Based Delay-Dependent Robust H∞ Control of Nonline...

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2.11 Chinese Control and Decision Conference（CCDC）

作者： Miaoxin Wang is with the school of Control and Computer Engineering,North china Electric Power University,{2.,102.06,china.Xinzhi Liu is with the Department of Applied Mathematics,University of Waterloo,Waterloo,Ontario,Canada,N2.3.1.Jizhen Liu is with the school of Control and Computer Engineering,North china Electric Power University,{2.,102.06,china.Miaomiao Ma is with the school of Control and Computer Engineering,North china Electric Power University,{2.,102.06,china

Observer-based delay-dependent robust H∞ controller design problem for state and input time-delays systems with a class of nonlinear uncertainties is discussed in this *** that the nonlinear uncertain functions in the considered model are gain-bounded,we obtain a sufficient condition for robustly asymptotic stability and H∞ performance of the closed-loop system in the light of Lyapunov stability *** solving a pair of linear matrix inequalities （LMIs）,we construct delay-dependent state feedback control law which guarantees robustly asymptotic stability of the closed-loop system and reduce the effect of the disturbance input on the controlled output to a prescribed *** delay-bounds and the H∞ performance bound can be optimized.A numerical example is given to illustrate our results.

关键词： Nonlinear uncertain systems State and input delays Delay-dependent Robust H∞ control Observer LMI

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