检索结果-南通市图书馆

Asymmetric Catalytic Hydrogenation Using Rhodium Diphosphinites Derived From D-glucose and D-mannitol

在线全文

学校读者我要写书评

暂无评论

chinese chemical Letters 2000年第7期11卷 587-588页

作者： Peng JIANG Shi Jie LU(State Key laboratory of Oxo Synthesis and Selective Oxidation, Lanzhou institute of chemical physics, chinese academy of sciences, Lanzhou 730000) chinese Acad Sci Lanzhou Inst Chem Phys State Key Lab Oxo Synth & Select Oxidat Lanzhou 730000 Peoples R China

Three diphosphinites were synthesized for preparing rhodium-diphosphinite complexes. The complexes were used for asymmetric catalytic hydrogenation of amino acid precursor alpha-acetamidocinnamic acid and its methyl e... 详细信息

关键词： asymmetric catalysis hydrogenation rhodium diphosphinites alpha-acetamidocinnic acid

Attosecond resolution quantum dynamics for atoms and molecules in strong laser fields

在线全文

学校读者我要写书评

暂无评论

Attosecond resolution quantum dynamics for atoms and molecul...

State-to-State Dynamics of Elementary chemical Reactions

第十五届全国原子与分子物理学术会议

作者： Ke-Li Han State Key laboratory of Molecular Reaction Dynamics,dalian institute of chemical physics,chinese academy of sciences,dalian 116023,china

A parallel quantum electron and nuclei wave packet computer method has been developed to study laser-atom/molecule interaction in the nonperturbative regime with attosecond resolution. The nonlinear phenomena occurred...

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

State-to-State Dynamics of Elementary Chemical Reactions

SYNTHESIS OF SPINEL MgAl2O4 AS A GOOD CATALYST SUPPORT FOR PARTIAL OXIDATION OF METHANE TO SYNGAS

第九届全国化学动力学会议

作者： Xueming Yang State Key laboratory of Molecular Reaction Dynamics,dalian institute of chemical physics,chinese academy of sciences,dalian,Liaoning 116023, china

＜正＞State-to-state molecular beam scattering is a very powerful probe to the dynamics of elementary chemical reactions. During the last few years in our laboratory, we have employed the high resolution H atom Rydberg tagging technique to investigate elementary chemical reactions at the full quantum state resolved scattering level. In this talk, we will

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 Catalysis 1999年第1期20卷 2-3页

作者： Pan Xiulian, Liu Shenglin, Sheng Shishan, Xiong Guoxing (State Key laboratory of Catalysis, dalian institute of chemical physics, The chinese academy of sciences, dalian 116023) 中科院大连化学物理所催化基础国家重点实验室辽宁大连 116023

γ Ａｌ２Ｏ３ｈａｓｂｅｅｎｉｎｔｅｎｓｉｖｅｌｙｓｔｕｄｉｅｄａｓａｃａｔａｌｙｓｔｓｕｐｐｏｒｔｉｎａｌｋａｎｅｃｏｎｖｅｒｓｉｏｎｄｕｅｔｏｉｔｓｌａｒｇｅｓｕｒｆａｃｅａｒｅａ．Ｈｏｗｅｖｅｒ，ｉｔｉｓｓｕｓ... 详细信息

γ Ａｌ２Ｏ３ｈａｓｂｅｅｎｉｎｔｅｎｓｉｖｅｌｙｓｔｕｄｉｅｄａｓａｃａｔａｌｙｓｔｓｕｐｐｏｒｔｉｎａｌｋａｎｅｃｏｎｖｅｒｓｉｏｎｄｕｅｔｏｉｔｓｌａｒｇｅｓｕｒｆａｃｅａｒｅａ．Ｈｏｗｅｖｅｒ，ｉｔｉｓｓｕｓｃｅｐｔｉｂｌｅｔｏｃｒｙｓｔａｌ...

关键词： spinel magnesium aluminate methane partial oxidation syngas

Correlation Quantum Dynamics between Electrons and H2+,D2+ Molecule with Attosecond Resolution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Correlation Quantum Dynamics between Electrons and H2+,D2+ M...

CROSSED SUPERSONIC MOLECULAR BEAM STUDY OF Cl+CH₂I₂→ICl+CH₂I

第四届全国青年计算物理学术会议

作者： Ke-Li Han (State Key laboratory of Molecular Reaction Dynamics dalian institute of chemical physics, chinese academy of sciences,dalian 116023 china)

Recently, Niikura et al. (Nature 421, 826 (2003)) have applied the entanglement approach to exploit the correlation between the electronic and nuclear wave packets formed during the multiphoton ionization of the D2 molecule with a precision of about 200 attoseconds. Here, we use the time-dependent-wave-packet method to calculate the kinetic energy distribution of the D+ ion resulting from the re-collision between an

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 chemical Letters 1994年第9期5卷 785-788页

作者： Jian Xin QI Guang Jun WANG Yong Xiang SHA Hou Ming YIN Guo Zhong HE Nan Quan LOU(State Key laboratory of Molecular Reaction Dynamics dalian institute of chemical physics. chinese academy of sciences dalian, 116023)

s: The reaction Cl+CH2I2→ICl+CH2I has been Studied at a relative collision energy of 53.2 kJ/mol using the crossed beam technique. Angular and translational energy distributions of reactively scattered ICI Preducts have ho measured. The angular distribution is consistent with reaction occurring through a short lived complex with life time about 0.8 of the rotational period. The kinetic energy distributions measured for this system show strong coupling to scattering angles. The forward and backward scattered products have higher translational energy than sideways scattered. A phase space model is developed witch can give a good explanation for the experimental energy distributions.

关键词： CH Cl CROSSED SUPERSONIC MOLECULAR BEAM STUDY OF Cl+CH2I2

Physical mechanisms of plant roots affecting weathering and leaching of loess soil

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2006年第9期49卷 1002-1008页

作者： LI Yong1,2, ZHANG Qingwen1,2, WAN Guojiang3, HUANG Ronggui3, PIAO Hechun3, BAI Lingyu2 & LI Lu2 1. State Key laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, institute of Soil and Water Conservation, chinese academy of sciences, Yangling 712100, china 2. institute of Agro-Environment and Sustainable Development, chinese academy of Agricultural sciences, Beijing 100081, china 3. institute of Geochemistry, chinese academy of sciences, Guiyang 550002, china 1. State Key laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences Yangling 712100 China 2. institute of Agro-Environment and Sustainable Development Chinese Academy of Agricultural Sciences Beijing 100081 China 3. institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

Plant roots have potential impacts on soil mineral weathering and *** objective is to understand the physical mechanisms of plant roots affecting weathering andleaching of loess soil. Root densities were measured through the method of a large-size dug profile,and transport fluxes of soil elements were determined using an undisturbed monolith soilinfiltration device on the hilly and gully regions of the chinese Loess Plateau. The results showthat the improvement effects of soil environment by plant roots are mainly controlled by the densityand weight of the fibrous roots with the diameters less than 1 mm. Plant roots have the strongereffects on soil physical properties than chemical properties. The principal components analysis(PCA) indicates that soil physical properties by plant roots account for 56.7% of variations in soilenvironment whereas soil chemical properties and pH contribute about 24.2% of the soil *** roles of plant roots in controlling soil weathering and leaching increased in the followingorder: infiltration enhancement > increase of bio-active substance > stabilization of soilstructure. The effects of plant roots on soil mineral weathering and leaching can be quantifiedusing the multiple regression models with the high prediction accuracies developed in this study.

关键词： plant roots, soil weathering and leaching rates, soil environment field, principal components analysis (PCA), chinese Loess Plateau.

Positive Charges on Lysine Residues of the Extrinsic 18 kDa Protein Are Important to Its Electrostatic Interaction with Spinach Photosystem Ⅱ Membranes

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2005年第11期37卷 737-742页

作者： Jin-Peng GAO Zhen-Hua YONG Feng ZHANG Kang-Cheng RUAN Chun-He XU Gen-Yun CHEN institute of Plant Physiology & Ecology.Shanghai institutes for Biological sciences,chinese academy of sciences,Shanghai 200032,china laboratory of Proteomics,institute of Biochemistry and Cell Biology,Shanghai institutes for Biological sciences,chinese academy of sciences,Shanghai 200031,china College of sciences,Zhejiang University.Hangzhou 310029,china Graduate School of the chinese academy of sciences,Shanghai 200032,china institute of Plant Physiology & Ecology Shanghai Institutes for Biological Sciences Chinese Academy of SciencesShanghai 200032 China Graduate School of the chinese academy of sciencesShanghai 200032 China College of sciences Zhejiang UniversityHangzhou 310029 China laboratory of Proteomics Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of SciencesShanghai 200031 China

To determine the contribution of charged amino acids to binding with the photosystem Ⅱcomplex(PSⅡ),the amino or carboxyl groups of the extrinsic 18 kDa protein were modified with N-succinimidyl propionate(NSP)or glycine methyl ester(GME)in the presence of a water-soluble carbodiimide,*** on isoelectric point shift,4-10 and 10-14 amino groups were modified in the presence of2 and 4 mM NSP,***,3-4 carboxyl groups were modified by reaction with *** of negatively charged carboxyl groups with GME did not alter the binding activity of theextrinsic 18 kDa ***,the NSP-modified 18 kDa protein,in which the positively charged aminogroups had been modified to uncharged methyl esters,failed to bind with the PSⅡ membrane in the presenceof the extrinsic 23 kDa *** defect can not be attributed to structural or conformational alterationsimposed by chemical modification,as the fluorescence and circular dichroism spectra among native,GME-and NSP-modified extrinsic 18 kDa proteins were ***,we have concluded that the positive chargesof lysyl residues in the extrinsic 18 kDa protein are important for its interaction with PSⅡ membranes in thepresence of the extrinsic 23 kDa ***,it was found that the negative charges of carboxylgroups of this protein did not participate in binding with the extrinsic 23 kDa protein associated with PSⅡmembranes.

关键词： extrinsic 18 kDa protein circular dichroism electrostatic interaction chemical modification

PRODUCTION OF LIGHTOLEFINS FROM CO2 HYDROGENATION OVER Fe/SILICALITE-2 CATALYST Ⅱ. PROMOTION EFFECT OF MnO PROMOTER

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 1997年第1期 21-29页

作者： XU Long-Ya WANG Qing-Xia LIANG Dong-Bai LIN Li-Wu(Oalian institute of chemical physics. The Chipese academy of sciencesdalian, Liaoning 116023)CUI Wei XU Yi-De(State Key laboratory of Catalysis dalian institute of chemical physics, The chinese academy

MnO is a desirable Promoter to Fe/Silicalite-2 catalyst for the production of light olefins from CO2 hydrogenation. With addition of MnOpromoter to Fe/Si-2 catalyst, the selectivity to lighy olefins, eslpecially theolefin/paraffin ratio. inereased obvionsly. while the yield of CH4 as well asCO formed from CO2 hydrogenation was hardly affected by MnO additionThe conversion of CO2 was insensitive to the addition of MnO promoter Ithas been exhibited that the CO adsorption ability and capacity inereasedwith MnO introduction which was favorable for the first formation of C2H4and C3H6 during Co2/CO hydrogenation and for the inerement of olefinselectivity by means of CO2-TPD CO2/H2-TPSR and CO/H2-TPSR as wellas CO2/H2 pulse reaction characterizations.

关键词： Fe-MnO catalyst. silicalite-2 light alkenes. carbon dioxide MnO