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⊙第121篇⊙

Preparation of mesocarbon microbeads from coal tar
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注意:本論文已在JOURNAL OF MATERIALS SCIENCE 34 (1999) 4043 – 4050發表
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YONG-GEN LU¨(呂永根) , LICHENG LING, DONG WU, LANG LIU, BIJIANG ZHANG
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy
of Science, P.O.B. 165, Taiyuan Shanxi, People's Republic of China
ISAO MOCHIDA
Institute of Advanced Material Study, Kyushu University, Kasuga, 816, Japan


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⊙

用稱重法研究聚丙烯腈樹脂的凝固過程
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注意:本論文已在《新型碳材料》 Vol.19, No. 1, pp. 16–20, 2004發表
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呂永根1 , 楊常玲2 , 翟磊3 , 李永紅3 , 呂春祥3 , 賀福3 , 凌立成3
(1 東華大學材料科學與工程學院,上海200051; 2.東華大學化學與化工學院,上海200051;
3.中國科學院山西煤炭化學研究所炭材料重點實驗室,山西太原030001)

摘要: 將聚丙烯腈二甲亞砜紡絲液在試管中于二甲亞砜水溶液中成型并凝固,通過計量凝固樣品重量隨時間 的變化來考察在不同凝固浴條件下的凝固速率,并觀察了凝固樣品的橫斷面形貌。結果表明:凝固樣品重量的變 化可以直觀地反應不同凝固浴條件下聚丙烯腈一-FO亞砜(DMs0)一水體系凝固速率的變化。隨凝固浴濃度的提高, 凝固速度減小,樣品橫截面趨于均勻化、致密化;凝固溫度從30℃升高到50℃ ,凝固速度加快,截面由非圓形變為 圓形,但在80℃下凝固速度反而下降;凝固浴中第三組份的添加降低了擴散速度,但會引起孔洞的產生。
關鍵詞: 聚丙烯腈纖維;凝固;稱重法
中圖分類號: TQ 342 .3


A study of coagulation in wet—spining by a weighing method

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
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注意:本論文已在 Mathematical and Computer Modelling 40 (2004) 465-479發表
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ZHIPENG QIU (邱志鵬)
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
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注意:本論文已在 Nonlinear Analysis: RealWorld Applications 6 (2005) 155 – 173發表
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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⊙

現階段我國健康城市建設的戰略思考和路徑設計
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注意:本論文已在 《上海城市規劃》 2006 年 6 期,總第 71 期, 12-15 頁 發表
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周向紅 諸大建
同濟大學經濟與管理學院公共管理系,上海,200092

摘要:健康城市目前已成為世界各國減少城市化進程中健康危害的新路徑。我國自1994年8月啟動健康城市項目,北京、上海、蘇州等陸續加入這一運動中,并將相關活動納入到城市發展的計劃中。這些城市在創建健康城市方面已經初步呈現各自獨特的優勢和鮮明的地域特色。本文結合大量文獻以及實地考察對我國健康城市運動進行分析和剖解,并為我國健康城市運動建設提供針對性建議。
關鍵詞:健康城市 戰略思考

The Research on the Method and Strategy to Healthy City in China

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發展戰略思考和路徑設計
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注意:本論文已在 《宏觀經濟研究》,2006年第8期,總第93期,第45頁發表
使用者請注明論文出處

周向紅 諸大建
同濟大學經濟與管理學院公共管理系,上海,200092

摘要:傳統城市交通發展規劃及模式類似于工程行政管理而不是社會公共管理,以滿足快捷的交通需求為主要目標,對交通發展的決策成本和環境代價考慮較少。隨著城市化進程日益深入,城市交通對健康造成的危害及經濟損失日漸嚴重。本文從城市交通健康危害入手,嘗試從政策分析的角度對現階段我國城市交通發展模式進行分析和探討,并從戰略框架、技術路徑等不同層面提出了一些建議。
關鍵詞:城市交通 健康影響 政策分析


The Research on the Method and Strategy to Urban Transportation in China : from a Healthy Visual Angel

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⊙

加拿大健康城市實踐及其啟示
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注意:本論文已在 《公共管理學報》2006年3期,第68-73頁發表
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周向紅
(同濟大學 經濟與管理學院,上海 200092)

摘要:健康城市目前已成為世界各國減少城市化進程中健康危害的新路徑。作為健康城市誕生地加拿大,近幾十年健康城市及健康城市項目在不斷的實踐和發展過程出現了一系列變化,如健康城市特征的變化,健康城市項目內涵的演變等;此外多倫多等地在實踐過程也經歷了高潮和低谷的波動。本文結合大量文獻資料以及實地考察對加拿大健康城市運動進行分析和剖解,并重點介紹多倫多健康住宅,蒙特利爾城市交通等案例,為我國健康城市運動建設提供了借鑒性的框架。同時本文結合我國實際情況,提出了突破公共衛生領域,強調健康城市項目包容性,建立以政府為主導跨行業跨部門的健康城市戰略框架,面向交通的城市土地利用規劃(TOD)等若干建議。
關鍵詞:健康城市;發展脈絡;加拿大


The healthy City Programme:Experience and Practices around Canada

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⊙

加拿大醫療衛生體系的經驗及對我國的啟示
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注意:本論文已在 《中共浙江省委黨校學報》2007年02期發表
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周向紅 吳昀橋
(同濟大學 經濟與管理學院,上海 200092)

摘要:加拿大經過了長期的探索與實踐,現已經基本上形成了一套比較完整的醫療衛生體系,并基本上解決了國內居民的醫療衛生問題,充分滿足了本國居民的醫療保障。加拿大公共衛生體系體現出了普遍性、全面性、可及性等特點。普遍性、全面性、可及性使加拿大的每一位居民都能夠公平的獲得完善的醫療衛生服務,便攜性則保證了加拿大居民不管身在何處都能夠被公共衛生保健保險所覆蓋。而地方政府主導模式則意味著各省和地區的的政府承擔區域公共衛生保健保險的主要責任。雖然我國和加拿大國情有別,但一些經驗是具有普遍意義的,本文結合大量文獻資料以及實地考察對加拿大醫療保障進行分析和剖解,為我國現行的改革提供了借鑒性的框架.
關鍵詞: 加拿大,醫療保障體系,啟示


The enlightenment of the experience of the construction of the public health system in Canada to our country

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
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注意:本論文已在 Inc. J Appl Polym Sci 102:798–803, 2006發表
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Yonggen Lu(呂永根),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
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注意:本論文已在Journal of Shanghai Jiaotong University,Vol. E-8,No.1, 2003, 85-88發表
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LIANG Fa-yun1 (梁發云) ,  CHEN Long-zhu1 (陳龍珠) ,  LI Jian-bao2 (李檢保)
(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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