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Resolution of α-cyclohexyl-mandelic acid enantiomers by two-phase (O/W) recognition chiral extraction

science china Chemistry 2007年第6期50卷 764-769页

作者： TANG KeWen1,2, ZHANG GuoLi2, HUANG KeLong2, LI Yuanjian3 & YI JianMin1,2 1 Department of Chemistry and Chemical Engineering, Hunan Institute of science and Technology, Yueyang 414000, china 2 college of Chemistry and Chemical Engineering, central south university, changsha 410083, china 3.college of pharmaceutical science, central south university, changsha 410078, china Department of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Yueyang China college of Chemistry and Chemical Engineering Central South University Changsha China college of pharmaceutical science Central South University Changsha China

This paper presents a new chiral separation technology:two-phase(O/W)recognition chiral *** behavior of alpha-cyclohexyl-mandelic acid enantiomers was studied in the extraction system with D(L)-isobutyl tartrate in 1,2-dichloroethane organic phase and beta-CD derivatives in aqueous phase,and the influence of the kind and concentration of extractant and pH on extraction performance was *** experimental results indicate that two-phase(O/W)recognition chiral extraction is of strong chiral separation ***-^-CD,HE-beta-CD and Me-beta-CD have higher recognition ability for S-CHMA than that for R-CHMA,among which HP-beta-CD has the strongest ability;whereas,D-isobutyl tartrate has reversed recognition ability for *** the extraction system containing HP-beta-CD and D-isobutyl tartrate,e.e.% of S-CHMA in aqueous phase reached 27.6% by one stage extraction,and the distribution ratio for R-CHMA(k_R)and for S-CHMA(k_S)and separation factor(alpha)are 2.44,0.89 and 2.49,***,pH and concentration of extractant have great effects on chiral separation ***-phase(O/W)recognition chiral extraction has great significance for preparative separation of racemic compounds.

关键词： two-phase(W/0)recognition chiral extraction alpha-cyclohexyl-mandelic acid enantiomers

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Inhibitory effects of cariporide on LPC-induced expression of ICAM-1 and adhesion of monocytes to smooth muscle cells in vitro

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Acta Pharmacologica Sinica 2006年第10期27卷 1326-1332页

作者： Zhi LI Tao SONG Gui-zhen LIU Li-ying LIU~2 Department of Pharmacology,pharmaceutical college,central south university,changsha 410078,china Department of Pharmacology Pharmaceutical College Central South University Changsha China

Aim:To explore the effects of cariporide on the expression of intercellular adhe-sion molecule-1(ICAM-1)and the adhesion of monocytes to vascular smoothmuscle cells(SMC)in ***:Monocytes were isolated from humanperipheral blood by the Ficoll-Hypaque *** expression of ICAM-1 inSMC was detected by *** adhesion of monocytes to SMC was stimu-lated by lysophosphatidylcholine(LPC).The adhesion ratio of monocytes wasassayed by measuring protein *** intracellular pH([pH]i)of SMC wasmeasured with 2’,7’-bis(2-carboxyethyl)-5,6-carboxyfluorescein(BCECF).Results:Preincubation of SMC with LPC alone(5 μg/mL)for 4 h markedly enhanced theexpression of ICAM-1 in SMC and the rate of the adhesion of monocytes to SMCin a concentration-dependent and time-related *** simultaneously alsoinduced an increase of[pH]ivalue in *** concentration-dependentlyreduced the adhesion ratio of monocytes to SMC and the expression of ICAM-1in SMC induced by *** inhibitory effects of cariporide on the expression ofICAM-1 in SMC and the adhesion of monocytes to SMC also were associatedwith blocking LPC-induced elevation of the[pH]ivalue in ***:LPC-induced monocyte-SMC adhesion may be mediated via activation of theNa~+/H~+(NHE)*** action mechanism of cariporide may be related withinhibition of activation of the Na~+/H~+ exchanger of plasma membranes and ICAM-1expression on the surface of SMC induced by LPC.

关键词： Na~+/H~+ exchanger cariporide lysophosphatidylcholine intercellular adhesion molecule-l monocyte smooth muscle cells

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Survival probability and ruin probability of a risk model

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Applied Mathematics(A Journal of Chinese Universities) 2008年第3期23卷 256-264页

作者： LUO Jian-hua college of science,central south university of Forestry and Technology,changsha 410004,china Institute of Statistics,central south university of Forestry and Technology,changsha 410004,china. college of science Central South University of Forestry and Technology Changsha China Institute of Statistics Central South University of Forestry and Technology Changsha China

In this paper, a new risk model is studied in which the rate of premium income is regarded as a random variable, the arrival of insurance policies is a Poisson process and the process of claim occurring is p-thinning process. The integral representations of the survival probability are gotten. The explicit formula of the survival probability on the infinite interval is obtained in the special casc cxponential *** Lundberg inequality and the common formula of the ruin probability are gotten in terms of some techniques from martingale theory.

关键词： risk model thinning process survival probability martingale ruin probability integral representation

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Drag reduction of flow boiling with polymer additives

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Journal of central south university of Technology 2001年第2期8卷 143-146页

作者： QIU Yun ren 1,CHEN Wei ping 2,SI Qin 3 (1.college of Chemistry and Chemical Engineering, central south university, changsha 410083, china 2.Editorial Office of Journal of central south university, changsha 410083, china 3.college of Chemical E college of Chemistry and Chemical Engineering Central South University Changsha China Editorial Office of Journal of central south university Changsha China college of Chemical Engineering Tianjin University Tianjin China

The drag reducing effect of polymer additive aqueous solution was investigated in flow boiling, and the polymer additives were two kinds of polyacrylamide (PAM) with relative molecular mass about 2.56×10 6 and 8.55×10 6. The frictional pressure drop was calculated according to the measured total pressure drop. The results show that the flow drag of flow boiling is reduced by adding a small amount of PAM to water when heat flux is in the range of 15.1 kW·m -2 to 47.0 kW·m -2 , when the mass fraction of PAM is higher than 2.0×10 -5 , the drag reducing effect is obvious. Drag reducing effect of PAM, whose relative molecular mass is 8.55×10 6, is slightly better than that of 2.56×10 6 at the same mass fraction, and the greater the flow rate of the additive solution, the better the effect of the drag reduction.

关键词： polymer additive flow boiling drag reduction pressure drop

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Characteristic atom arranging crystallogphy of alloy phases for Au-Cu system

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science china(Technological sciences) 2011年第6期54卷 1560-1567页

作者： XIE YouQing1,2,3,LIU XinBi1,2,3,PENG HongJian4,NIE YaoZhuang5,LI XiaoBo6 & LI YanFen1,2,3 1 School of Materials science and Engineering,central south university,changsha 410083,china 2 Powder Metallurgy Research Institute,central south university,changsha 410083 china 3 State Key Laboratory of Powder Metallurgy,central south university,changsha 410083,china 4 School of Chemistry and Chemical Engineering,central south university,changsha 410083,china 5 School of Physical science and Technique,central south university,changsha,410083,china 6 college of Mechanical Engineering,Xiangtan university,Xiangtan 411105,china School of Materials science and Engineering Central South University Changsha China Powder Metallurgy Research Institute Central South University Changsha China State Key Laboratory of Powder Metallurgy Central South University Changsha China School of Chemistry and Chemical Engineering Central South University Changsha China School of Physical science and Technique Central South University Changsha China college of Mechanical Engineering Xiangtan University Xiangtan China

In this paper,it is pointed out that the descriptions of alloy phase structures are dependent on structural unit *** the systematic science of alloys(SSA),the alloy phase structures are described by means of the symmetry element sequence combining with characteristic atom *** is named the characteristic atom arranging structure,which can display the characteristic atoms at the lattice sites and the micro-inhomogeneity,besides the *** characteristic atom has its own characters:neighboring configuration,potential energy,volume and electronic *** micro-inhomogeneity of alloy phases can be described by concentrations and short-range ordered parameters of characteristic *** differences between the electronic structures of alloy phases and electronic structures of characteristic atoms in the alloy phases are also discussed.

关键词： systematic science of alloys Au-Cu system alloy phase structure micro-inhomogeneity

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Protective effects of cariporide on endothelial dysfunction induced by high glucose

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Acta Pharmacologica Sinica 2005年第3期26卷 329-333页

作者： Shuang-xi WANG Xiao-ming XIONG Tao SONG Li-ying LIU~2 Department of Pharmacology,pharmaceutical college,central south Universi~ changsha 410078,china Department of Pharmacology Pharmaceutical College Central South University Changsha China

Aim:To explore the effects of cariporide,a selective sodium-hydrogen antiporterinhibitor,on endothelial dysfunction induced by high ***:Acetyl-choline (ACh)-induced endothelium-dependent relaxation (EDR),sodium nitro-prusside (SNP)-induced endothelium-independent relaxation and biochemical pa-rameters including malondialdehyde (MDA),superoxide dismutase (SOD),andnitric oxide (NO) were measured in rat isolated ***:A 6-h incubationof aortic rings with high glucose (44 mmol/L) resulted in a significant inhibitionof EDR,but had no effects on endothelium-independent *** the 6-hincubation of aortic rings in the co-presence of cariporide (0.01,0.1,and 1 μmol/L)with high glucose,cariporide prevented the inhibition of EDR caused by highglucose in concentration-dependent ***,high glucose decreasedSOD activity and contents of NO,and increased MDA concentration in *** (1 μmol/L) significantly resisted the decrease of NO contentand SOD activity,and elevation of MDA concentration caused by high glucose inaortic *** (44 mmol/L) or cariporide (1 μmol/L) alone had no ef-fect on EDR,endothelium-independent relaxation and biochemical ***:Cariporide significantly prevented endothelial dysfunction inducedby high *** mechanisms of endothelial dysfunction induced by highglucose may involve the activation of sodium-hydrogen antiporter and the gen-eration of oxygen-free radicals,but it is not related to the change of osmolarity.

关键词： sodium-hydrogen antiporter endothelium glucose nitric oxide malondialdehyde superoxide dismutase

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Training, simulation, restoration expert system for power grid

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Journal of central south university of Technology 2001年第1期8卷 69-73页

作者： LUO An,CHEN Qian (college of Information Engineering, central south university, changsha 410083, china) college of Information Engineering Central South University Changsha China

The paper introduces some technology for training, simulation, restoration expert system of power grid, the structure of the system including function composition, hardware and software composition are discussed, knowledge representation and the method to establish device graphical library for expert system are given, the fault setting and diagnosis for training and simulation as well as restoration technology with deep first searching arithmetic and heuristic inference are presented. The research provides a good base for developing the training, simulation, restoration system of power companies.

关键词： training simulation restoration expert system power grid

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Synthesis and purification of trialkyl compounds of gallium and indium

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Rare Metals 2002年第1期21卷 1-6页

作者： SHU Wangen, ZHOU Zhongcheng and LI Xiong Chemistry and Chemical Engineering college, central south university, changsha 410083, china Chemistry and Chemistry Engineering college Central South University Changsha 410083 Chemistry and Chemical Engineering college Central South University Changsha 410083

The The research progress in trialkyl compounds of gallium andindium was discussed from two aspect, one was the chemical synthesisof the compounds and the other was the purification of them. Thereare three synthesis routes be- ing reported in the first aspect, *** route staring form pure metal, the route starting from the puremetal trihalides, and the electrochemical route. In the secondaspect, the purifying methods of decomposition-distillation and zonerefining were reviewed.

关键词： trialkyl compounds gallium nd indium synthesis purification

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The Influence of Some Key Parameters on Fatigue Life of Common Metallic Components

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Journal of central south university 2000年第3期12卷 159-161页

作者： LIU Yi lun (college of Mechanical and Electrical Engineering, central south university, changsha 410083, china) college of Mechanical and Electrical Engineering Central South University Changsha China

The effect of key parameters on fatigue life of common metallic components, e.g. steel, aluminium alloy, has been analysed quantitatively. The influential coverage and degree of these parameters have been investigated systematically, some phenomena which can′t be discovered with qualitative analysis method have been revealed, a series of valuable conclusions has been obtained, which would be very beneficial to fatigue resistant design and improvement of anti fatigue ability of metallic components.

关键词： metallic material component fatigue life key parameter effect

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Practical stabilization of receding-horizon control

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Journal of central south university of Technology 2001年第4期8卷 268-271页

作者： LIU Bi yu,GUI Wei hua,MU Min (college of Information science and Engineering, central south university, changsha 410083, china) college of Information science and Engineering Central South University Changsha China

The purpose of this work is to propose a scheme to stabilize the predictive control systems in the practical stability sense. In the paper, the authors dealt with a general discrete predictive control system x j+1|t =f(x j|t , u j|t ) by using the Lyapunov direct method combining with receding horizon control technique, and presented a new condition to guarantee the practical stabilization of the systems. With the proposed results, one can design the optimal controllers easily to practically stabilize the predictive control systems.

关键词： receding-horizon control practical stability Lyapunov function nonlinear system optimization

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