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Flow microcalorimetry of adsorption of anionic alkyl surfactants at the solid/liquid interface

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chinese Journal of Chemistry 1992年第3期10卷 200-205页

作者： TAN, Xin-Yi YAN, Hai-Ke HU, Ri-Heng HEPLER, Loren G. Institute of Chemistry, chinese academy of sciences, beijing 100080 Honorary Professor of Institute of Chemistry, chinese academy of sciences, present address: Department of Chemistry, University of Alberta, Edmonton, Alberta T6G {3.{3. Canada. 1Institute of Chemistry Chinese Academy of Sciences Beijing 1000802Honorary Professor of Institute of Chemistry Chinese Academy of Sciences

Flow microcalorimetry was used to study the adsoption of anionic alkyl surfactants from aque-- ous solutions onto silica. It is found that for alkyl sulfate systems the strength of adsorption interaction increases with increases of the alkyl chain length and decreases as temperature rises. The adsorption depends only on monomer concentration of the solution even above the critical micelle concentration (cmc). The assumption is made that the adsorption involves only a transfer of monomers from bulk to surface phase. A different adsorption mechanism is operative for the alkyl carboxylate.

关键词： SDES

A model to predict phase equilibrium of CH4 and CO2.elathrate hydrate in aqueous electrolyte solutions

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A model to predict phase equilibrium of CH4 and CO2 elathrat...

Magnetostratigraphy of the late Cenozoic Laojunmiao anticline in the northern Qilian Mountains and its implications for the northern Tibetan Plateau uplift

中国科学院地质与地球物理研究所2.06学术年会

作者： Zhenhao Duan~* and Rui Sun State Key Laboratory of Lithospheric Evolution,Institute of Geology and geophysics,chinese {2. of {3.,beijing,10002.,china

A thermodynamic model to predict phase equilibrium of methane and carbon dioxide hydrate in aqueous electrolyte solutions is *** the Pitzer model to account for the variation of water activity due to electrolytes and dissolved gas in aqueous solutions,we extended the model based on ab initio molecular potential developed recently by us for the CH-HO and CO-HO binary systems to the CH(or CO-HO-salts *** of the model with extensive experimental data indicates that this model can accurately predict the phase equilibrium of CH hydrate and CO hydrate in various electrolyte solutions(such as aqueous NaCl,KCl, CaCl,NaCl + KCl,NaCl + CaCl solutions,and seawater) from zero to high ionic strength(about 6 m) and from low to high pressures.

关键词： Methane hydrate carbon dioxide hydrate thermodynamic stability electrolyte solution phase equilibrium formation conditions

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Science china Earth sciences 2005年第7期 1040-1051页

作者： FANG Xiaomin1,2. ZHAO Zhijun3.2. LI Jijun2. YAN Maodu2. PAN Baotian2. SONG Chunhui2.& DAI Shuang2. 1. Institute of Tibetan Plateau Research, chinese academy of sciences, beijing 100085,{2. 2. Key Laboratory of Western{2.'s Environmental Systems, Ministry of Education & College of Resources and Environment, Lanzhou University, Lanzhou 73.000,{2. 3. College of Geography, Nanjing Normal University, Nanjing 2.0097,{2.

Cenozoic sediments in the foreland basin——Jiuquan Basin in west Hexi Corridor recorded tectonic uplift information of the Qilian Mountains. High resolution paleomagnetic dating of the Laojunmiao （LJM） section across the central LJM anticline in the southern Jiuquan Basin reveals ages of the Getanggou Member, Niugetao Member in the Shulehe Formation, the Yumen Conglomerate, Jiuquan Conglomerate and Gobi Formation at >13.8.3.Ma, 8.3.4.9 Ma, 3.66― 0.93.Ma, 0.84―0.14 Ma and 0.14―0 Ma, respectively. Sedimentary evolution study suggests that the Qilian Mountains should begin to rise gradually since8―6.6 Ma, accompanied by sedimentary environments changing from lacustrine mudstones-sandstones to alluvial conglom- erates. Rapid uplift of the Qilian Mountains began at3.66 Ma, followed by a series of stepwise or intermittent intensive uplifts at about 2. Ma, 0.93.0.84 Ma and 0.14 Ma, which finally resulted in the present high Qilian Mountains.

关键词： Qilian Mountains Qinghai-Tibetan Plateau Jiuquan Basin magnetostratigraphy.

Theoretical analysis of polarization properties for tilted fiber Bragg gratings

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Science china(Information sciences) 2010年第2期53卷 390-397页

作者： XU Ou 1 , LU ShaoHua 2.& JIAN ShuiSheng 2.1 Faculty of Information Engineering, Guangdong University of Technology, Guangzhou 510006, china 2.Institute of Lightwave Technology, beijing Jiaotong University, beijing 100044, china 1. Faculty of Information Engineering Guangdong University of Technology Guangzhou 510006 China2. Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

The polarization properties for tilted fiber Bragg gratings (TFBGs) are investigated theoretically based on coupled-mode theory and Mueller matrix method. The expression of wavelength-related polarizationdependent loss (PDL) for TFBGs with different tilt angles is derived and calculated. Simulation results are compared, and the results indicate that the polarization capability of TFBGs with 45° angle is stronger than other TFBGs with smaller angles. The degree of polarization for unpolarized light passing TFBGs is also simulated to further evaluate the polarization properties for various tilt angles. In addition, the relationship between physical parameters of a TFBG and its polarization capability is discussed.

关键词： coupled-mode theory degree of polarization (DOP) Mueller matrix method polarization dependent loss (PDL) tilted fiber Bragg gratings

Dynamical Evolution of Gamma-Ray Burst Remnants with Evolving Radiative Efficiency

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chinese Journal of Astronomy and Astrophysics 2002年第6期2卷 525-532页

作者： Jin-Bo Feng, Yong-Feng Huang, Zi-Gao Dai and Tan Lu1 Department of Astronomy, Nanjing University, Nanjing 2.0093.0}LCRHEA, Institute for High-Energy Physics, chinese academy of sciences, {3. 10003. LCRHEA Institute for High-Energy Physics Chinese Academy of Sciences Beijing 100039

In previous works, a generic dynamical model has been suggested by Huang. et al., which is shown to be correct for both adiabatic and radiative blast-waves, in both ultra-relativistic and non-relativistic phases. In deriving their equations, Huang et al. have assumed that the radiative efficiency of the fireball is constant. They then applied their model directly to realistic cases where the radiative efficiency evolves with time. In this paper, we abandon the above assumption and re-derive a more accurate dynamical equation for gamma-ray burst remnants. Numerical results show that the model presented by Huang et al. is accurate enough in general cases.

关键词： gamma rays : bursts hydrodynamics radiation mechanisms : nonthermal

中国电动汽车技术水平国际比较研究——基于跨国专利的视角

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科研管理 2013年第3期34卷 128-136页

作者：杨利锋陈凯华中国科学技术大学管理学院安徽合肥230026 中国科学院科技政策与管理科学研究所北京100190 中国科学院创新发展研究中心北京100190

在利用主要国家专利机构的专利数据对电动汽车技术发展水平和趋势进行分析的基础上,引入跨国专利(transnational patents)概念,以避免在利用专利数据进行国际技术比较中"本土优势"的影响,客观评价主要国家电动汽车相对技术水平。构建跨... 详细信息

在利用主要国家专利机构的专利数据对电动汽车技术发展水平和趋势进行分析的基础上,引入跨国专利(transnational patents)概念,以避免在利用专利数据进行国际技术比较中"本土优势"的影响,客观评价主要国家电动汽车相对技术水平。构建跨国专利比例指标,对主要国家电动汽车技术的国际化程度进行比较研究,并引入专利比较优势指数分析主要国家电动汽车技术的比较优势。统计结果表明,中国电动汽车技术发展迅速,但是与日本、美国等国家依然存在较大差距,主要表现在国际专利申请数量少、专利国际化程度低等方面;中国在电池及电池控制技术领域存在比较优势,而电机及电机控制技术存在明显的比较劣势,中国需要进一步加强电机技术的研发以推动电动汽车产业的整体平衡发展。

关键词：跨国专利电动汽车技术国际比较

Error estimate of the homogenization solution for elliptic problems with small periodic coefficients on L~∞(Ω)

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Science china Mathematics 2010年第5期53卷 194-215页

作者： HE WenMing1,2.& CUI JunZhi3.1Department of Mathematics,Wenzhou University,Wenzhou 3.0}03.,china 2.chool of Aeronautics and Astronautics,Zhejiang University,Hangzhou 3.002.,china 3.SEC,ICMSEC,{2. of Mathematics and Systems Science,chinese {2. of sciences,beijing 100190,china 1. Department of Mathematics Wenzhou University Wenzhou 325035 China2. School of Aeronautics and Astronautics Zhejiang University Hangzhou 310027 China3. LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

In this paper,we discuss the multi-scale homogenization theory for the second order elliptic problems with small periodic coefficients of the form xi(aij(xε) uεx(jx)) = f(x).Assuming n = 2.and u0 ∈ W 1,∞(Ω),we present an error estimate between the homogenization solution u0(x) and the exact solution uε(x) on the Sobolev space L∞(Ω).

关键词： multi-scale homogenization theory homogenization solution second order elliptic equations with small periodic coeficients

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Progress in Natural Science:Materials International 2005年第12期15卷 1110-1116页

作者： LIU Gang,LI Xin,JIANG Weimei and LI Min Department of Atmospheric sciences,Nanjing University,Nanjing 2.0093.china {2. Municipal Environmental Protection Bureau,{2. 100044,china Department of Atmospheric sciences Nanjing University Nanjing 210093 China. beijing Municipal Environmental Protection Bureau Beijing 100044 China

The S-L (She and Leveque) scaling law,also named the hierarchical similarity theory,has been extensively tested for the turbulence made in the laboratory,but seldom been tested for the turbulence in the atmospheric boundary layer (ABL).In this paper, the S-L scaling law is applied to the turbulence in the ABL observed under unstably stratified conditions and over different types of underlying *** results of analyses show that over this type of homogeneous and flat underlying surface,such as the underlying surface in HUBEX (Huaihe River Basin Energy and Water Cycle Experiment),vertical speed and temperature fields well satisfy the S-L scaling *** the turbulence over the homogeneous but rather rough underlying surface of forest and under unstably stratified conditions in PFRD (Park Falls Ranger District of the Chequamegon National Forest,Wisconsin,USA),the analyses show that the vertical speed and temperature fields sometimes conform sometimes do not conform to the S-L scaling ***,at a time,either both of the vertical speed and temperature fields conform to the S-L scaling law,or both of them do *** speed fields in both of the field experiments do not satisfy the S-L scaling *** new explanation of the above-mentioned phenomena is given.

关键词： atmospheric turbulence Reynolds number S-L scaling law in the atmospheric turbulence boundary layer processes nonlinear dynamics

Controlling the Molecular Weight and Molecular Weight Distribution using Compressed CO_2.Antisolvent

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chinese Chemical Letters 2000年第10期11卷 933-934页

作者： Jun LIU, Zhi Min LIU, Bu Xing HAN, Jian WANG, Qing HUO, Fang Fang LIU (Center For Molecular sciences, Institute of Chemistry, chinese academy of sciences, {2. 100080 (Chemical Engineering College of {2. United University, {2. 10002.) (Department of Chemical Engineering, University of Science and Technology of Hebei, Shijiazhuang 050018) chinese Acad Sci Inst Chem Ctr Mol Sci Beijing 100080 Peoples R China beijing United Univ Chem Engn Coll Beijing 100023 Peoples R China Univ Sci & Technol Hebei Dept Chem Engn Shijiazhuang 050018 Peoples R China

Effect of CO2.dissolved in tetrahydrofuran (THF) on the polymerization of styrene in THF was studied at 3.3.2.K and different pressures. It was found that the molecular weight (MW) and MW distribution of the polystyre... 详细信息

关键词： CO_2 antisolvent styrene polymerization