In order to eliminate the global warming effect, it is highly required to develop new technologies with lower or zero emission of CO2 to the environment. In this work, a fluidized bed coal gasifier with in-situ fixati...
详细信息
ISBN:
(纸本)9780816910229
In order to eliminate the global warming effect, it is highly required to develop new technologies with lower or zero emission of CO2 to the environment. In this work, a fluidized bed coal gasifier with in-situ fixation of CO2 is simulated by developing a comprehensive two-dimensional unsteady state model. Eddy Dissipation Concept (EDC) model is adopted for describing the turbulent mixing and detailed chemical kinetics simultaneously. The profiles of temperature, velocity and reaction rate, and particle trajectories are predicted and analyzed, also the mechanism of flow and reaction, including the in-situ fixation process of CO2, is discussed. Comparing with the traditional coal gasifier without CaO, a much higher concentration of H2 (traditional: 5.78 vol%, present: 65.43 vol%) and lower concentration of CO (traditional: 37.15 vol%, present: 10.51 vol%) and CO2 (traditional: >45 vol%, present: 14.05 vol%) are obtained.
Human motion detection based on computer vision is a frontier research topic and is causing an increasing attention in the field of computer vision research. The wavelet transform is used to sharpen the ambiguous edge...
详细信息
Human motion detection based on computer vision is a frontier research topic and is causing an increasing attention in the field of computer vision research. The wavelet transform is used to sharpen the ambiguous edges in human motion image. The shadow’s effect to the image processing is also removed. The edge extraction can be successfully realized. This is an effective method for the research of human motion analysis system.
CdTe nanocrystals were prepared in aqueous solution via the reaction between Cd^2＋ and NaHTe in the presence of mercaptoacetic acid. Interactions between CdTe nanocrystals and phenylalanine were formed via electrosta...
详细信息
CdTe nanocrystals were prepared in aqueous solution via the reaction between Cd^2＋ and NaHTe in the presence of mercaptoacetic acid. Interactions between CdTe nanocrystals and phenylalanine were formed via electrostatic/coordinate self-assembly. The photoluminescence intensity of CdTe nanocrystals was improved obviously. The interaction mechanism was discussed and was considered to be surface passivation.
Kinetically controlled enzymatic syntheses of cefaclow with D-(-)-phenylglycine methyl ester (PGME) and 7-aminodesacetoxymethyl-3-chlorocephalosporanic acid (7ACCA) were carried out by penicillin *** product yield was...
Kinetically controlled enzymatic syntheses of cefaclow with D-(-)-phenylglycine methyl ester (PGME) and 7-aminodesacetoxymethyl-3-chlorocephalosporanic acid (7ACCA) were carried out by penicillin *** product yield was improved by the continuous removal of product from the reaction mixture via complexation of cefaclor with *** situ product removal (ISPR) decreased the product concentration in the bioreactor,consequently the product yield was improved about 21%.The effects of pH,temperatures and substrate concentrations on the enzymatic conversion of cefaclor were investigated.
作者：
Ben XuZiyu LiYan ZhuHua WangHong MaAiwu DongHai HuangNational Laboratory of Plant Molecular Genetics
Shanghai Institute of Plant Physiology and EcologyShanghai Institutes for Biological SciencesChinese Academy of Sciences300 Fanglin RoadShanghai 200032China State Key Laboratory of Genetic EngineeringDepartment of BiochemistrySchool of Life SciencesFudan UniversityShanghai 200433China Department of Biology and the Huck Institute for the Life SciencesThe Pennsylvania State UniversityUniversity ParkPA 16802USA
Effect of bovine serum albumin(BSA)on the temperature-dependent association behavior of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)(PEO-PPO-PEO)block copolymers was investigated using pyrene fluore...
详细信息
Effect of bovine serum albumin(BSA)on the temperature-dependent association behavior of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)(PEO-PPO-PEO)block copolymers was investigated using pyrene fluorescence *** critical micellization temperature(CMT)of pluronics in aqueous solution was increased by the addition of BSA.A closed association model was used to obtain the standard free energies(△DG^(0)),enthalpies(△DH^(0)),and entropies(△DS^(0))of *** standard enthalpy and entropy of micellization for pluronic polymers in water were decreased with an increase of the BSA *** more PPO component in the pluronic polymer,the higher the changed values of micellization enthalpy and *** hydrophobic part of the pluronics,PPO,was responsible for the interaction between pluronics and *** interaction between PPO and BSA was correlated to the alternation of the PPO-PPO interaction by the addition of BSA,which would shift the CMT toward higher temperature and alter the thermodynamic parameters of micellization for pluronics in aqueous solutions.
A new cellulose solvent ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was used to treat wheat straw and steam-exploded wheat straw (SEWS) in order to improve the enzymatic hy- drolysis rates, while the ...
详细信息
A new cellulose solvent ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was used to treat wheat straw and steam-exploded wheat straw (SEWS) in order to improve the enzymatic hy- drolysis rates, while the water was used as the con- trol. The enzymatic hydrolysis results showed that the hydrolysis rates of materials treated with [BMIM]Cl were improved. The hydrolysis rate of treated wheat straw could reach 70.37% and the SEWS could be completely hydrolyzed, while hydrolysis rates of the wheat straw and SEWS treated with water were 42.78% and 68.78% under the same conditions, re- spectively. The FTIR analysis and polymerization degree measurement indicated that the hydrolysis rates improvement was attributed to the decrease of the polymerization degrees of cellulose and hemi- cellulose, the absolute crystallinity degree of cellu- lose and the increase of its reaction accessibility.
On p. 2766, Qinshan Zhu and co‐workers report on multishell hollow Cu 2 O microspheres that are synthesized by a facile and one‐pot solvothermal route. A two‐step organization process, in which hollow microspheres ...
详细信息
On p. 2766, Qinshan Zhu and co‐workers report on multishell hollow Cu 2 O microspheres that are synthesized by a facile and one‐pot solvothermal route. A two‐step organization process, in which hollow microspheres of Cu 2 (OH) 3 NO 3 are formed first followed by reduction to Cu 2 O by glutamic acid, leads to the special multishell and hollow microstructures. Interestingly, a Cu 2 O gas sensor fabricated with the multishell microspheres shows a much higher sensitivity to ethanol than solid Cu 2 O microspheres. Hierarchical assembly of hollow microstructures is of great scientific and practical value and remains a great challenge. This paper presents a facile and one‐pot synthesis of Cu 2 O microspheres with multilayered and porous shells, which were organized by nanocrystals. The time‐dependent experiments revealed a two‐step organization process, in which hollow microspheres of Cu 2 (OH) 3 NO 3 were formed first due to the Ostwald ripening and then reduced by glutamic acid, the resultant Cu 2 O nanocrystals were deposited on the hollow intermediate microspheres and organized into finally multishell structures. The special microstructures actually recorded the evolution process of materials morphologies and microstructures in space and time scales, implying an intermediate‐templating route, which is important for understanding and fabricating complex architectures. The Cu 2 O microspheres obtained were used to fabricate a gas sensor, which showed much higher sensitivity than solid Cu 2 O microspheres.
A novel three-liquid-phase extraction system （TES） composed of butyl acetate, block copolymer polyethylene oxide-polypropylene oxide-polyethylene oxide and ammonium sulphate aqueous solution [（NH4）2SO4] as top, mi...
详细信息
A novel three-liquid-phase extraction system （TES） composed of butyl acetate, block copolymer polyethylene oxide-polypropylene oxide-polyethylene oxide and ammonium sulphate aqueous solution [（NH4）2SO4] as top, middle, and bottom phase, respectively, has been developed. The copolymer recycling and partitioning behavior of penicillin V has been studied in this system. Results show that the copolymer could be purified and recycled and penicillin V of the filtrated ferment broth could be partitioned unevenly among the phases and purified in the top phase of this TES. About 90 wt.% of penicillin V could be distributed into the top phase around pH 2.5 and only less than 0.1 wt.% left in the bottom phase.
暂无评论