检索结果-南通市图书馆

Chinese Chemical Letters 1996年第10期7卷 962-964页

作者： Jun Fa WEI Xian Da YU dao sen jin(Lanzhou Institute of Chemical Physics. Academia Sinica, Lanzhou 730000) Lanzhou Inst. of Chemical Physics Academia Sinica Lanzhou 730000

A methane monooxygenase-like dinuclear complex of iron (Ⅲ) with a chiral heptadentate ligand has been synthesed and tested for catalytic ability for asymmetric epoxidation of styrene with iodosylbenzene. The results show that the complex exhibits many qualitative features, such as electronic spectrum. catalytic behavior. and asymmetric induction similar to those of methane monooxygenase and catalyzes styrene epoxidation to R- (+)-styrene oxide in 9. 3% yield and 72. 9% optical yield.

关键词： Ability Asymmetric DinuclearIron Monooxygenase Catalytic

DETERMINATION OF DEGREE OF CHARGE TRANSFER IN CONDUCTING LANGMUIR-BLODGETT FILM OF BEDT-TTF-TCNQ

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1993年第6期4卷 555-558页

作者： Yu Fang XIAO Zhong Qi YAO dao sen jin Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000

A mixed Langmuir-Blodgett film was built up by mixture 1:1 of bis (ethyldithio)tetrathiafulvalene-tetracyanoquinodimethane/stearie acid(BEDT-TTF- TCNQ/SA).A degree of charge transfer(CT)in complex of BEDT-TTF with TCNQ was estimated at 0.477～0,486 by Raman frequencies of central Vc=c and Vc-s,The existence of charge transfer in BEDT-TTF-TCNQ has been confirmed by FTIR and XPS spectroscopy.

关键词： TTF Figure Th DETERMINATION OF DEGREE OF CHARGE TRANSFER IN CONDUCTING LANGMUIR-BLODGETT FILM OF BEDT-TTF-TCNQ

SYNTHESIS AND CHARACTERIZATION OF NOVEL MULTIFUNCTIONAL HOST COMPOUNDS.1.β-CYCLODEXTRIN DERIVATIVE BEARING DIETHANOLAMINE MOIETY

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1991年第3期2卷 205-208页

作者： Bao Jian SHEN Lin Hui TONG dao sen jin Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou,730000

A novel β-cyclodextrin(β-CD)derivative bearing diethanolamine moiety was synthesized by a convenient method with 63% yield,and the new host compound was characterized by (13)~C-NMR,FT-IR spectra etc,

关键词： ppm SYNTHESIS AND CHARACTERIZATION OF NOVEL MULTIFUNCTIONAL HOST COMPOUNDS.1 CYCLODEXTRIN DERIVATIVE BEARING DIETHANOLAMINE MOIETY

HIGH CONDUCTIVITIES OF LANGMUIR-BLODGETT FILMS OF TBT-TTF-NI(DMIT)_2/STEARIC ACID

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1992年第6期3卷 479-482页

作者： Yu Fang XIAO Zhong Qi YAO dao sen jin Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000

Conductivities of Langmuir-Blodgett(LB) films of tetrabenzylthio- tetra-thiafulvalence-Ni(dmit)_2/stearic acid (SA)were described. This charge transfer complex was transferred with SA onto a glass plate coated with A1 electrodes. The relation of conductivities of LB films with molar ratio of SA was studied. The conductivities of LB films of TBT-TTF-Ni(dmit)_2/SA were measured under undoped and I_2 doped states. The maximum conductivity () of LB film was 40s/cm.

关键词： TTF STEARIC ACID Ni DMIT HIGH CONDUCTIVITIES OF LANGMUIR-BLODGETT FILMS OF TBT-TTF-NI TBT

THE REACTION OF (μ_3-CPh)Co_3(CO)_9 WITH TRANSITION METAL CARBONYL ANION M(CO)_3(RCOCp) AND CHARACTERIZATION OF CLUSTERS (μ_3-CPh)CO_2M(CO)_8(RCOCPp) (M=Mo, W; R=H,CH_3. C_2H_5O)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1994年第10期5卷 889-892页

作者： He Ping WU Yuan Qi YIN dao sen jin (Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou,730000)

Clusters (A,-CPh)Co2M(CO)8(RCOCp)(M=Mo,W; R=H,CH3,C2H5O) were synthesized by refluxing a solution of (μ3-CPh)Co3(CO)9 and transition metal carbonyl anion M(CO)3(RCOCP) in THF. The clusters were characterred by C/H an... 详细信息

关键词： CH3 C2H5O Co3 CO2M Mo

A CONVENIENT SYNTHESIS OF β-CYCLODEXTRIN 2-AND 3-O-MONOBENZOATE

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1994年第8期5卷 645-646页

作者： Ai You HAO Lin Hui TONG Fu Sheng ZHANG dao sen jin(Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000)

CD 2-O- and 3-O-monobenzoate were synthesised by direct benzoyletion of β-CD with benzoyl chloride in alkaline equeous solution.

关键词： n

Experimental investigation on using CO_(2)/H_(2)O emulsion with high water cut in enhanced oil recovery

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 974-986页

作者： Xi-dao Wu Peng Xiao Bei Liu Guang-jin Chen Jian-Hua Pang State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Ocean Intelligence Technology Center Shenzhen Institute of Guangdong Ocean UniversityShenzhen518120GuangdongChina

CO_(2) emulsions used for EOR have received a lot of interest because of its good performance on CO_(2)mobility ***,most of them have been focusing on the high quality CO_(2) emulsion(high CO_(2) fraction),while CO_(2) emulsion with high water cut has been rarely *** this paper,we carried out a comprehensive experimental study of using high water cut CO_(2)/H_(2)O emulsion for enhancing oil ***,a nonionic surfactant,alkyl glycosides(APG),was selected to stabilize CO_(2)/H_(2)O emulsion,and the corresponding morphology and stability were evaluated with a transparent PVT ***,plugging capacity and apparent viscosity of CO_(2)/H_(2)O emulsion were measured systematically by a sand pack displacement apparatus connected with a 1.95-m long capillary ***,a high water cut(40 vol%) CO_(2)/H_(2)O emulsion was selected for flooding experiments in a long sand pack and a core sample,and the oil recovery,the rate of oil recovery,and the pressure gradients were *** results indicated that APG had a good performance on emulsifying and stabilizing CO_(2) *** inversion from H_(2)O/CO_(2) emulsion to CO_(2)/H_(2)O emulsion with the increase in water cut was ***_(2)/H_(2)O emulsions with lower water cuts presented higher apparent viscosity,while the optimal plugging capacity of CO_(2)/H_(2)O emulsion occurred at a certain water ***,the displacement using CO_(2)/H_(2)O emulsion provided 18.98% and 13.36% additional oil recovery than that using pure CO_(2) in long sand pack and core tests,*** work may provide guidelines for EOR using CO_(2) emulsions with high water cut.

关键词： CO_(2)/H_(2)O emulsion High water cut CO_(2) mobility control Enhanced oil recovery

SYNTHESIS AND REACTIVITY OF OXOPEROXOMOLYBDENUM(Ⅵ)COMPLEXES:THE ACTIVE SPECIES IN THE HALCON EPOXIDATION PROCESS

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1992年第12期3卷 1003-1006页

作者： Zheng Rong LU Department of Chemistry,Wuhan University,Wuhan 430072 Yuan Qi YIN dao sen jin Lanzhou Institute of Chemical Physics,Academia Sinica,Lanzhou 730000

Two oxoperoxomolytxlenum(Ⅵ)complexes,MoO(O_2)(OCH_2CH_2)_2NH.H_2O(5)and MoO(O_2)(OCH(CH_3)CH_2)_2 NH(6)have been synthesized by the reaction of MoO_2(OCH_2CH_2)_2NH·CH_3OH(3)and MoO_2(OCH(CH_3)CH_2)_2NH(4)with tert-... 详细信息

关键词： HALCON VI COMPLEXES SYNTHESIS AND REACTIVITY OF OXOPEROXOMOLYBDENUM

Experimental study of the damage characteristics of rocks containing non-penetrating cracks under cyclic loading

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2024年第2期34卷 197-210页

作者： Jun Xu Xiaochun Xiao Lu Ma sen Luo Jiaxu jin Baijian Wu School of Mechanics and Engineering Liaoning Technical UniversityFuxin 123000China School of Civil Engineering Liaoning Technical UniversityFuxin 123000China Department of Engineering Mechanics Southeast UniversityNanjing 211189China

The damage evolution process of non-penetrating cracks often causes some unexpected engineering *** specimens containing non-penetrating crack(s)are used to study the damage evolution and characteristics under cyclic *** results show that under cyclic loading,the relationship between the number of non-penetrating crack(s)and the characteristic parameters(cyclic number,peak stress,peak strain,failure stress,and failure strain)of the pre-cracked specimens can be represented by a decreasing linear *** damage evolution equation is fitted by calibrating the accumulative plastic strain for each cycle,and the damage constitutive equation is proposed by the concept of effective ***,non-penetrating cracks are more likely to cause uneven stress distribution,damage accumulation,and local failure of *** local failure can change the stress distribution and relieve the inhibition of non-penetrating crack extension and eventually cause a dramatic destruction of the ***,the evolution process caused by non-penetrating cracks can be regarded as one of the important reasons for inducing *** results are expected to improve the understanding of the process of spalling formation and rockburst and can be used to analyze the stability of rocks or rock structures.

关键词： Damage characteristics Constitutive model Fissured rocks Non-penetrating crack Cyclic loading

STRUCTURAL EVIDENCES OF Ru (H)_2(H_2) (PPh_3)_3 AT LOW TEMPERATURE

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1993年第7期4卷 653-656页

作者： Quan Ling SUO Xing Ming LIU Yuan Qi YIN dao sen jin Shu Ben LI Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000

FTIR spectrum at liquid nitrogen temperature and IH NMR of air-sensitive polyhydride Ru(H)_2(H_2)(PPh_3)_3 have been measured for the first time. It is found that a fluxional process happens at room temperature, but t... 详细信息

关键词： STRUCTURAL EVIDENCES OF Ru PPh3 H2 AT LOW TEMPERATURE