检索结果-南通市图书馆

Experimental and Numerical Investigations of an Ice-slurry Generator

在线全文

学校读者我要写书评

暂无评论

过程工程学报 2004年第1期4卷 1-7页

作者：洪若瑜董梁尚德义徐建生 Kawaji M dept. chem. & chem. eng. Soochow University Suzhou Jiangsu 215006 China dept. chem. eng. & Appl. chem. University of Toronto Toronto ON M5S 3E5 Canada

A new test facility equipped with refrigerant and brine circulation systems, and a rotating-scraper ice-slurry generator was constructed to analyze the ice-slurry flow and heat transfer accompanied by phase change in an industrial generator. The axial and transverse brine temperature and ice fraction concentration profiles in the ice generator were measured. The heat transfer efficiency lower than the average was identified in the upper half of the ice generator and its cause was determined by conducting three-dimensional numerical simulation using a commercial CFD code, FLUENT. Approaches of improving the brine-side heat transfer rates were investigated by incorporating extra mixing blades from numerical simulation.

关键词：泥浆泵计算流体力学实验研究数值模拟

Ce^(4+)-Induced Apoptosis of Taxus cuspidata Cells in Suspension Culture

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2002年第2期20卷 139-144页

作者：葛志强元英进王艳东马振毅胡宗定 dept. of Biochem. eng. Sch. of Chem. Eng. and Technol. Tianjin Univ. Tianjin 300072 China

The standard detection hallmarks of apoptosis of Taxus cuspidata cells in suspension culture with Ce 4+ were studied. The condensation and margination of chromatin were observed under the electron microscopy. DNA fragmentation ranged 'DNA ladder' on agarose gel electrophoresis. TdT mediated dUTP nick end labeling (TUNEL) analysis of the cells reveals that the nuclear DNA strand breaks can be identified by labeling free 3′ OH termini. These results suggest that Ce 4+ can induce apoptosis of Taxus cuspidata cells and also indicate that there is a certain relationship between apoptosis and secondary metabolite product Taxol.

关键词： rare earths cerium apoptosis Taxus cuspidata cell suspension culture

SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTAL POLYMERS WITH T-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 1996年第1期14卷 71-79页

作者：李自法陈志军张淑媛曹少魁周其凤 Mater. eng. dept. Zhengzhou Univ. Zhengzhou 450052 chem. dept. Peking Univ. Beijing 100871

Two series of new liquid crystalline polymers with T-shaped two-dimensional mesogenic units were synthesized by low temperature solution polycondensations of 4-substituted N-2, 5-dihydroxybenzylidene aniline monomers with different diacyl dichlorides. The polymers were found to be nematic and shown liquid crystalline behavior. The melting temperature T-m and the clearing temperature T-i of the polymers change regularly with varying of the monomer structures.

关键词： liquid crystal polymer T-shaped two-dimensional mesogenic unit N-2, 5-dihydroxybenzylidene-4-substituted aniline

SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTAL POLYMERS WITH T-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS (Ⅱ)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 1997年第1期15卷 65-73页

作者：李自法郑世军张淑媛曹少魁李磊刘广胜周其凤 Mater. eng. dept. Zhengzhou Univ. Zhengzhou 450052 chem. dept. Peking Univ. Beijing 100871

A series of liquid crystalline polymers with T-shaped two-dimensional mesogenic unitswere synthesized via low temperature solution polycondensation of 2-(4'-alkoxy-phenyl)hydroquinone with various diacyl dichlorides. The polymers were found to be nematic andshown thermotropic liquid crystalline behaviors through observations using DSC, polarizedmicroscopy and X-ray diffraction. The melting temperature T_m and the isotropizationtemperature T_i of the polymers change regularly with varying of the monomer structures.

关键词： T-shaped two-dimensional mesogenic units Liquid crystal polymer Polymer synthesis

Microstructure and Phase Behavior of Cationic Gemini/Anionic Polyelectrolyte/Water Ternary System

在线全文

学校读者我要写书评

暂无评论

过程工程学报 2006年第2期6卷 296-301页

作者：皮瑛瑛尚亚卓彭昌军刘洪来 dept. chem.stry and State Key Lab. chem. eng. East China Univ. Sci. & Technol.

The microstructure of cationic gemini surfactant 1,6-bis(dodecyldimethylammonium) hexane dibromide C12H25(CH3)2N(CH2)6N(CH3)2C12H252Br (126122Br) and oppositely charged polyelectrolyte poly(acrylic acid, sodium salt) (NaPA) in aqueous solution has been studied by using fluorescence, conductivity measurement, freeze-etching and TEM. The data obtained from fluorescence and conductivity measurement show that micelle-like or complex can form between the gemini surfactant (126122Br) and polyelectrolyte NaPA due to the static electric interaction and hydrophobic forces. Through freeze-etching and TEM, the microstructure of the mixture solution has been studied, which is consistent with the result from micropolarity. Comparing the fluorescence spectrum of system of dodecyltrimethylammonium bromide (DTAB) and NaPA with that of system of gemini surfactant (126122Br) and NaPA, it can be found that the interaction between gemini surfactant (126122Br) and NaPA is stronger than that between DTAB and NaPA. And the phase behavior of (126122Br) and NaPA in aqueous solution has also been detected. It can be shown that the precipitate will transform into gel in higher NaPA concentration.

关键词：表面活性剂高分子电解质分子交互作用微胶粒显微结构

The Use of Fractal for Prediction of Burning Rate of Composite Solid Propellants

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2000年第4期9卷 361-364页

作者： Manouchehr Nikazar,Mohammad B. Bagherpour,Bahram Dabir (chem. eng. dept., Amirkabir University of Technology (Tehran Polytechnic), No.424, Hafez Ave., Tehran, Iran.) chem. eng. dept. Amirkabir University of Technology (Tehran Polytechnic) Tehran Iran

By using the fractal geometry it is possible to calculate the actual AP (Ammonium Perchlorate) surface area and oxidizer-binder interface fractal dimension in the prediction of burning rate of composite solid propellants. In this investigation, the fractal dimension was determined by a procedure known as the "Box Counting Method". Using this dimension, surface area relations were developed for the rough particles. This method was implemented in the PEM (Petite Ensemble Model) burning rate model. The comparison of burning rates for a typical propellant by the PEM and fractal model shows that the burning rates obtained by using the fractal geometry are slightly less than those obtained by the PEM model.

关键词： PEM model composite solid propellant burning rate fractal.

Fast Pyrolysis of Biomass in a Spout-fluidized Bed Reactor ——Analysis of Composition and Combustion Characteristics of Liquid Product from Biomass

在线全文

学校读者我要写书评

暂无评论

过程工程学报 2006年第2期6卷 192-196页

作者：陈明强王君王新运张学才张素平任铮伟颜涌捷 dept. chem.cal eng.neering Anhui University of Science and Technology Huainan dept. chem. eng. Energy Recourses East China Univ. Sci. & Technol.

In order to gain insight into the fast pyrolysis mechanism of biomass and the relationship between bio-oil composition and pyrolysis reaction conditions, to assess the possibility for the raw bio-oil to be used as fuel, and to evaluate the concept of spout-fluidized bed reactor as the reactor for fast pyrolysis of biomass to prepare fuel oil, the composition and combustion characteristics of bio-oil prepared in a spout-fluidized bed reactor with a designed maximum capacity 5 kg/h of sawdust as feeding material, were investigated by GC-MS and thermogravimetry. 14 aromatic series chem.cals were identified. The thermogravimetric analysis indicated that the bio-oil was liable to combustion, the combustion temperature increased with the heating rate, and only minute ash was generated when it burned. The kinetics of the combustion reaction was studied and the kinetic parameters were calculated by both Ozawa-Flynn-Wall and Popsecu methods. The results agree well with each other. The most probable combustion mechanism functions determined by Popescu method are f(α)=k(1-α)2(400～406 ℃), f(α)=1/2k(1-α)3 (406～416 ℃) and f( α)=2k(1-α)3/2 (416～430 ℃) respectively.

关键词：生物量热解流动床液体产物燃烧特征

Removal of Anionic Metal Ions from Wastewater by Hydroxide-type Adsorbents

在线全文

学校读者我要写书评

暂无评论

过程工程学报 2006年第3期6卷 357-362页

作者： Toyohisa Fujita Gjergj Dodbiba Jun Sadaki Atsushi Shibayama dept. Geosystem eng. Graduate School Eng.The University of TokyoTokyo 113-8654Japan dept. Material-Process. eng.&Appl. chem. for Environ. Faculty Eng.&Resources Sci.Akita Univ.Akita 010-8502Japan

Generally speaking,anionic metal concentrations in wastewater from industries and mineral processing plants are well above the allowed limits for effluent set by the Ministry of Environment of Japan. Nowadays,the removal of anionic ions has been considered difficult and development of new process is desperately needed. In this paper,we report the development of three hydroxide-type adsorbents,illustrating their adsorption efficiency in removing As,Se,Mo and Sb ions from aqueous solutions. The main finding of this work was that the adsorption behavior was influenced very much by both the pH and the adsorbent concentration. Nevertheless,the newly developed hydroxide-type adsorbents were very effective in reducing the concentration of those anionic ions.

关键词： hydroxide-type adsorbent adsorption anionic metal ions removal wastewater

SEPARATION OF MATERIALS IN SWIRL SHAFT PREHEATER

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 1996年第3期11卷 53-61页

作者：朱明曲祖源邱树恒 Inst. of Mater. Sci./eng Wuhan Univ. of Tech. Wuhan 430070 China dept. of chem. eng. Guangxi Univ. Nanning 530004 China

On the basis of theoretical analysis and cold model test, the material motion locus and the particle size which can be separated in the swirl shaft preheater was stud-ied. A new calculation method for separation efficiency based on the meterial size distribution curve of charge and dis-charge stock from the shaft is discussed in this paper. The ex-perimental results show the material separation is due to in-teraction of both the centrifugation and the gravity. When the inlet gas velocity is a constant, the separation efficiency will be raised as the load of batch feeding inreases. If the load of batch feeding is a constant, the separation efficiency will be decreased together with the elevation of the inlet gas. The loss of shaft resistence is increased when the separation effi-ciency is raised. In our experiment the suitable separation ef-ficiency of the shaft is about 70 percent.

关键词： swirl shaft material size distribution load of batch feeding seperation efficiency'