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⊙第121篇⊙
Preparation of mesocarbon microbeads from coal tar
Abstract:Mesocarbon microbeads (MCMB) was prepared from coal tars with various primary pyridine insoluble fraction (PI) contents from 0 to 3.7 wt %, through heat treatment at 430–480 ℃ for different time under autoginious pressure. The heat treated coal tars were filtered under 150℃and the residue was rinsed with pyridine. MCMB was obtained as the pyridine insoluble fraction. Both yield and diameter of MCMB increased with the increasing of reaction temperature and holding time. It was found that primary PI also had strong influence on the formation of MCMB, which restricting coalescence between mesophase spheres by sticking on the surface of mesophase spheres or dispersing in the matrix. Low temperature, short reaction time and high PI content resulted in the MCMB with small diameter and narrow size distribution. Carbon block with 1.75 g/cm3 density could be easily obtained from the MCMB after molded under 100 MPa and carbonized at 1000℃ .
⊙第122篇⊙
用称重法研究聚丙烯腈树脂的凝固过程
（下载论文全文请点击上面的链接）
注意：本论文已在《新型碳材料》 Vol.19, No. 1, pp. 16–20, 2004发表
使用者请注明论文出处
吕永根1 ， 杨常玲2 ， 翟磊3 ， 李永红3 ， 吕春祥3 ， 贺福3 ， 凌立成3
(1 东华大学材料科学与工程学院，上海200051； 2．东华大学化学与化工学院，上海200051；
3．中国科学院山西煤炭化学研究所炭材料重点实验室，山西太原030001)
摘要： 将聚丙烯腈二甲亚砜纺丝液在试管中于二甲亚砜水溶液中成型并凝固，通过计量凝固样品重量随时间 的变化来考察在不同凝固浴条件下的凝固速率，并观察了凝固样品的横断面形貌。结果表明：凝固样品重量的变 化可以直观地反应不同凝固浴条件下聚丙烯腈一-FO亚砜(DMs0)一水体系凝固速率的变化。随凝固浴浓度的提高， 凝固速度减小，样品横截面趋于均匀化、致密化；凝固温度从30℃升高到50℃ ，凝固速度加快，截面由非圆形变为 圆形，但在80℃下凝固速度反而下降；凝固浴中第三组份的添加降低了扩散速度，但会引起孔洞的产生。
关键词： 聚丙烯腈纤维；凝固；称重法
中图分类号： TQ 342 ．3
LU Yong-gen1 , YANG Chang-1ing2, ZHAI Lei3, LI Yong-hong3, LU Chun-xiang3． HE Fu3, LING Li-cheng3
(1．College ofMaterial Sciences and Engineering, Dognhua University, Shanghai 200051, China;
2．Colege of Chemistry and Chemical Engineenng, Dognhua University, Shanghai 200051, China;
3．Key Lab of Carbon Material, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China)
Abstract: The influence of coagulation variables on diflusion during wet-spinning was investigated by measuring the remaining weight of the samples. The transverse structure of the coagulated sam ples was also studied. It is found that coagulation slows down with increasing dimethyl sulforide(DMSO)concentration while the transverse structure of the coagulated sam ple becomes finer. The coagulation speed is faster and the transverse structure is finer at 50℃ than at 30℃ and 80℃. The additive makes coagulation slower,however,some voids are generated across the coagu lated sam ples.
Key words:Polyacrylonitrile fiber；Coagulation；Mass weighting
⊙第123篇⊙
The Asymptotic Behavior of Flow Reactor Models with Two Nutrients
（下载英文论文全文请点击上面的链接）
注意：本论文已在
Mathematical and Computer Modelling 40 (2004) 465-479发表
使用者请注明论文出处
ZHIPENG QIU (邱志鹏)
Department of Mathematics, University of Science and Technology of China
Hefei 230026, P.R. China
and
Department of Applied Mathematics, Nanjing University of Science and Technology
Nanjing 210094, P.R. China
KAIFA WANG
Department of Mathematics, College of Medicine, Third Military Medical University
Chongqing 400038, P.R. China
YUN Zou
Department of Applied Mathematics, Nanjing University of Science and Technology
Nanjing 210094, P.R. China
Abstract: In this paper, the asymptotic behavior of flow reactor models with two nutrients
is considered. Different diffusion coefficients of the population and nutrients, the death rates of
the population and the velocity existing in the flow reactor are introduced in these models. In
complementary case, sufficient conditions for robust persistence and extinction of the population are
obtained by the theory of uniform persistence of infinite dimensional dynamical systems. Especially
for the model with equal diffusion coefficients and zero death rates, the global attractivity of the
unique positive steady-state solution is proved. In substitutable case, sufficient conditions for robust
persistence and extinction of population are also obtained by the same method. For the model with
equal diffusion coefficients and zero death rates, the uniqueness and global attractivity of the positive
steady-state solution is established.
Keywords--Flow reactor model, Two nutrients, Diffusion, Robust persistence.
⊙第124篇⊙
The asymptotic behavior of a single population model with space-limited and stage-structure
（下载英语论文全文请点击上面的链接）
注意：本论文已在 Nonlinear Analysis: RealWorld Applications 6 (2005) 155 – 173发表
使用者请注明论文出处
Zhipeng Qiua,b, KaifaWang c
a.Department of Mathematics, University of Science and Technology of China, Heifei 230026, PRChina
b.Department of Applied Mathematics, Nanjing University of Science and Technology, Nanjing 210094,
PRChina
c.Department of Mathematics, College of Medicine, Third Military Medical University, Chongqing 400038,
PRChina
Abstract: In this paper, a single population model with space-limited and stage-structure is considered. Sufficient
conditions for uniform persistence of the model are obtained by the theory of infinite dimensional
dynamical systems. Then by applying the theory of Hopf bifurcation and the Browder fixed point theorem,
sufficient conditions for the limit cycle of the model existing in small range and large range
are, respectively, obtained.
Keywords: Space-limited; Stage-structure; Periodic solution
⊙第125篇⊙
现阶段我国健康城市建设的战略思考和路径设计
（下载论文全文请点击上面的链接）
注意：本论文已在
《上海城市规划》 2006 年 6 期，总第 71 期， 12-15 页
发表
使用者请注明论文出处
周向红 诸大建
同济大学经济与管理学院公共管理系，上海，200092
摘要：健康城市目前已成为世界各国减少城市化进程中健康危害的新路径。我国自1994年8月启动健康城市项目，北京、上海、苏州等陆续加入这一运动中，并将相关活动纳入到城市发展的计划中。这些城市在创建健康城市方面已经初步呈现各自独特的优势和鲜明的地域特色。本文结合大量文献以及实地考察对我国健康城市运动进行分析和剖解，并为我国健康城市运动建设提供针对性建议。
关键词：健康城市 战略思考
Zhou xianghong, Zhu dajian
Abstract: With the urbanization proceeding forward, the urbanization and its process bring people many benefits, like the development of economy ,along with such painful outcomes as envirnmental pollution and harms to health. Healthy City Project is a worldwide movement growing in recent years, which aims to solve problems above mentioned,so does China. This paper will try to analyze and explore the present developing models of the Healthy city in China from the angle of public management. And finally the paper will suggest some specific policies on different levels, from technological method to strategic framework.
Keywords: Healthy cities Experience Practices Policy analysis China
⊙第126篇⊙
面向健康的城市交通发展战略思考和路径设计
（下载论文全文请点击上面的链接）
注意：本论文已在 《宏观经济研究》，2006年第8期，总第93期，第45页发表
使用者请注明论文出处
周向红 诸大建
同济大学经济与管理学院公共管理系，上海，200092
摘要：传统城市交通发展规划及模式类似于工程行政管理而不是社会公共管理,以满足快捷的交通需求为主要目标，对交通发展的决策成本和环境代价考虑较少。随着城市化进程日益深入，城市交通对健康造成的危害及经济损失日渐严重。本文从城市交通健康危害入手，尝试从政策分析的角度对现阶段我国城市交通发展模式进行分析和探讨，并从战略框架、技术路径等不同层面提出了一些建议。
关键词：城市交通 健康影响 政策分析
Zhou xianghong
Abstract: With the urbanization proceeding forward, the urban transportation does greater and greater harms to health. So does it in China. Focusing on the health of urban transportation, this paper will try to analyze and explore the present developing models of the urban transportation in China from the angle of public management. And finally the paper will suggest some specific policies on different levels, from technological method to strategic framework.
Keyword: Urban transportation, Healthy affect Policy analysis
⊙第127篇⊙
加拿大健康城市实践及其启示
（下载论文全文请点击上面的链接）
注意：本论文已在 《公共管理学报》2006年3期，第68-73页发表
使用者请注明论文出处
周向红
(同济大学 经济与管理学院,上海 200092)
摘要：健康城市目前已成为世界各国减少城市化进程中健康危害的新路径。作为健康城市诞生地加拿大，近几十年健康城市及健康城市项目在不断的实践和发展过程出现了一系列变化，如健康城市特征的变化，健康城市项目内涵的演变等；此外多伦多等地在实践过程也经历了高潮和低谷的波动。本文结合大量文献资料以及实地考察对加拿大健康城市运动进行分析和剖解,并重点介绍多伦多健康住宅,蒙特利尔城市交通等案例,为我国健康城市运动建设提供了借鉴性的框架。同时本文结合我国实际情况，提出了突破公共卫生领域，强调健康城市项目包容性,建立以政府为主导跨行业跨部门的健康城市战略框架,面向交通的城市土地利用规划（TOD）等若干建议。
关键词：健康城市；发展脉络；加拿大
Zhou Xianghong
（School of Economics and Management，Tongji University，Shanghai 200092,China）
Abstract: Urbanization and its process bring people many benefits, like the development of economy, along with such painful outcomes as environmental pollution and harms to health. Healthy City Project is a worldwide movement growing in recent years, which aims to solve problems above mentioned. In Canada, the cradle of healthy cities, through recent decade’s practice and development in healthy cities and healthy city project, appear a series of changes, such as the changes of healthy cities, characteristics, the development of the definition of healthy city, and so on. In addition, some cities have experienced rise and fall during the process of practice. This paper will analyze the healthy city movement in Canada, by combining abundant document and data with the on-the-spot investigation. It will focus on the examples, like healthy buildings in Toronto and the urban transportation in Montreal ,with the aim to provide a framework as a reference for out country’s healthy city movement and urban planning practice. At last, the paper put forword some feasibility suggestions for our country’s healthy city project ,from technological method to strategic framework.
Keyword:Healthy cities；Experience；Practices；Canada
⊙第128篇⊙
加拿大医疗卫生体系的经验及对我国的启示
（下载论文全文请点击上面的链接）
注意：本论文已在 《中共浙江省委党校学报》2007年02期发表
使用者请注明论文出处
周向红 吴昀桥
(同济大学 经济与管理学院,上海 200092)
摘要：加拿大经过了长期的探索与实践，现已经基本上形成了一套比较完整的医疗卫生体系，并基本上解决了国内居民的医疗卫生问题，充分满足了本国居民的医疗保障。加拿大公共卫生体系体现出了普遍性、全面性、可及性等特点。普遍性、全面性、可及性使加拿大的每一位居民都能够公平的获得完善的医疗卫生服务，便携性则保证了加拿大居民不管身在何处都能够被公共卫生保健保险所覆盖。而地方政府主导模式则意味着各省和地区的的政府承担区域公共卫生保健保险的主要责任。虽然我国和加拿大国情有别，但一些经验是具有普遍意义的，本文结合大量文献资料以及实地考察对加拿大医疗保障进行分析和剖解,为我国现行的改革提供了借鉴性的框架.
关键词： 加拿大，医疗保障体系，启示
Zhou Xianghong, Wu Yunqiao
（School of Economics and Management，Tongji University，Shanghai 200092,China）
Abstract:By a long time of exploration and practice, Canada has basically established a relatively whole public health system. Through the system, Canada has basically solved the problem of Canadian medical health and has relatively fully satisfied the demand from the resident. The public health system in Canada has taken on these characteristics, including universality, allsidedness, accessibility and so on. These characteristics of universality, allsidedness and accessibility can make every Canadian equally achieve perfect service of medical health. The all levels of government in Canada have specific responsibilities in the public health system and can cooperate very well. Besides, the public health system in Canada make some nonprofit organizations such as the medical association and so on play an important role in the supervisory system. In addition, the effect of family doctors is very important in the public health system, and Canadian government has devised a scientific process to hospitalize. Although there are some differences existed between our country and Canada, some experience of the construction of the public health system in Canada have universal meaning. On the basis of collecting and studying a great number of materials and field survey, the article has analyzed and dissected the public health system in Canada. In addition, the article has introduced some cases. The destination of the article is to give the construction of the pubic health system in our country some suggestions and direction.
Keyword: Canada; the public health system; the medical security
⊙第129篇⊙
Preparation of Porous Carbon Microspheres
（下载英语论文全文请点击上面的链接）
注意：本论文已在 Inc. J Appl Polym Sci 102:798–803, 2006发表
使用者请注明论文出处
Yonggen Lu(吕永根),1 Changling Yang,2 Haiqin Rong,1 Ding Pan1
1Department of Composite Material and Engineering, College of Material Sciences and Engineering, Donghua
University, Shanghai 200051, China
2Department of Basic Chemistry, College of Chemistry and Chemical Engineering, Donghua University, Shanghai
200051, China
Abstract: Porous carbon microspheres with good morphology, high yield, and controllable particle size were prepared from phenolic resin. The particle size and pore structure
of the carbon microspheres were mainly inherited from their precursors, resol microspheres, which were made through curing emulsified resol in water at 120°C under saturated pressure. The average particle size and specific surface area of the porous carbon microspheres was related to the concentration of resol and polyvinyl alcohol along with the heating program. The carbonization yield to 700°C was 55 wt %.
Keyword: curing of polymer; high temperature materials;particle size distribution; spherulites
⊙第130篇⊙
Influence of Carbonation on Mechanical Properties of Concrete
（下载英文论文全文请点击上面的链接）
注意：本论文已在Journal of Shanghai Jiaotong University,Vol. E-8,No.1, 2003, 85-88发表
使用者请注明论文出处
LIANG Fa-yun1 (梁发云) , CHEN Long-zhu1 (陈龙珠) , LI Jian-bao2 (李检保)
(1. Schoo l of Civil Eng. andM echanics, Shanghai Jiao tong Univ. , Shanghai 200030, China;
2. School of Civil Eng. , Tongji Univ. , Shanghai 200092)
Abstract: As one of the most important factors that determine the lifespan of a reinforced concrete structure, carbonat ion not only corrodes the reinforcing steel, but also changes the mechanical properties of concrete. For better understanding the performance of carbonated concrete structure, it is necessary to study the mechanical propert
of carbonated concrete. The strees-strain relationship of carbonated concrete was analyzed on the basis of experiments. The specimens were made by means of accelerated carbonation and then compressed on the test ing machine. Some very impo rtant characteristics of carbonated concrete were revealed by the testing results. In addition, a useful constitutive model of carbonated concrete, which proved to be suitable for analyzing carbonated concrete members, was established in this research.
Keyword: carbonation; concrete; acceleration; mechanical properties; stress-strain relationship
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