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A SYSTEM DYNAMICS APPROACH FOR SUSTAINABLE DEVELOPMENT IN THE MIYUN RESERVOIR AREA, CHINA

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Chinese Geographical Science 2002年第2期12卷 157-165页

作者： sun Yan feng,GUO huai cheng,QU Guang yi(Center for Environmental Sciences,Peking University,Beijing 100871,P. R. China) Center for Environmental Sciences Peking University Beijing P. R. China

Miyun Reservoir was designated as the water source of Beijing City in 1982. Since that time, socio economic development in Miyun Area has been slowing due to the restriction of severe environmental standards. More and more attention from the public and government has been paid to the regional sustainable development. And an effective planning for the local society management system is urgently desired. In this study, a regional sustainable development system dynamics model, named MiyunSD, is developed for supporting this planning task. MiyunSD consists of dynamic simulation models that explicitly consider information feedback that governs interactions in the system. Such models are capable of simulating the system′s behavior and predicting its developing situation of the future. For the study case, interactions among a number of system components within a time frame of fifteen years are examined dynamically. Three planning alternatives are carefully considered. The base run is based on an assumption that the existing pattern of human activities will prevail in the entire planning horizon, and the other alternatives are based on previous and present planning studies. The different alternatives will get different system′s environmental and socio economic results. Through analyzing these dynamic results, local authorities may find an optimal way to realize the objectives that the regional environment will be well protected and at the same time the economy will be rapidly developed.

关键词： Miyun reservoir sustainable development model policy management system dynamics

关于副本交换分子动力学模拟复杂化学反应的研究（英文）

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物理化学学报 2018年第10期34卷 1179-1188页

作者：辛亮孙淮上海交通大学化学化工学院上海200240 吉林大学无机合成与制备化学国家重点实验室长春130012 上海交通大学材料基因组联合研究中心上海200240

本文研究用温度副本交换分子动力学(T-REMD)和哈密顿副本交换分子动力学(H-REMD)方法模拟复杂化学反应的问题。使用具有不同活化能和反应能的简单置换反应模型,我们检验了上述两种方法用来预测反应平衡产物的效率和应用范围。T-REMD方... 详细信息

本文研究用温度副本交换分子动力学(T-REMD)和哈密顿副本交换分子动力学(H-REMD)方法模拟复杂化学反应的问题。使用具有不同活化能和反应能的简单置换反应模型,我们检验了上述两种方法用来预测反应平衡产物的效率和应用范围。T-REMD方法对具有适度活化能(约<20 kcal·mol^(-1))或者反应能量(<3 kcal·mol^(-1))的放热反应是有效的。由于在相空间的不完整采样,对于同时具有高活化能和反应能量的反应其模拟效率有严重障碍,并且对于吸热反应问题更为显着。另一方面,H-REMD对一系列具有不同活化能的反应能的模型表现出色,与T-REMD相比,H-REMD可以使用更少的副本获得优异的结果。

关键词：副本交换分子动力学复杂反应温度哈密顿

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树形分子包覆硫化镉量子点的抗老化性能研究

无机材料学报 2008年第2期23卷 379-382页

作者：丛日敏罗运军于怀清山东理工大学材料科学与工程学院淄博255049 北京理工大学材料科学与工程学院北京100081

以聚酰胺-胺树形分子为模板制备了平均粒径为2.5nm的CdS量子点,采用HRTEM、EDS、UV-vis、PL等手段对样品进行表征,研究了其在室温避光条件下的老化过程.结果表明,CdS量子点在刚制备的前5d里UV-vis、PL谱峰半峰宽变窄,发光效率迅速上升,... 详细信息

以聚酰胺-胺树形分子为模板制备了平均粒径为2.5nm的CdS量子点,采用HRTEM、EDS、UV-vis、PL等手段对样品进行表征,研究了其在室温避光条件下的老化过程.结果表明,CdS量子点在刚制备的前5d里UV-vis、PL谱峰半峰宽变窄,发光效率迅速上升,表明量子点以尺寸窄化生长为主;5d后UV-vis、PL谱峰半峰宽逐渐宽化,发光效率缓慢下降,表明量子点以尺寸宽化(Ostwald熟化)过程为主.树形分子的配位作用和模板作用赋予CdS量子点良好的抗老化性能,6个月后量子点粒径增量<0.3nm,PL强度约降低22%.

关键词： CdS量子点 PAMAM树形分子光致发光老化

Solvothermal-assisted liquid-phase exfoliation of large size and high quality black phosphorus

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Journal of Materiomics 2018年第2期4卷 129-134页

作者： Zhe Yan Xuexia He Liaona She Jie sun Ruibing Jiang Hua Xu Feng Shi Zhibin Lei Zong-huai Liu Key Laboratory of Applied Surface and Colloid Chemistry(Shaanxi Normal University) Ministry of EducationXi'an 710062China School of Materials Science and Engineering Shaanxi Normal UniversityXi'an 710062China Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119China

Black phosphorus(BP),especially for BP nanosheets,with unique layered structure among two dimensional(2D)materials has attracted much attention due to its outstanding physical properties,such as ultra-high mobility,in-plane anisotropic ***,the small horizontal-size of reported BP limits its applications in the integrated circuit or some functional *** this work,a solvothermalassisted liquid-phase exfoliation technique is firstly employed for preparing large size and high-quality BP *** the high-polar acetonitrile solvent,solvothermal treatment weakens the Van der Waals forces of block *** with the subsequently ultrasonic processing,effective exfoliation of large size and high-quality BP nanosheets are *** TEM,AFM and Raman results indicate that the prepared BP nanosheets are high quality with an average thickness of about 2 nm,and the horizontalsize is up to 10μ*** facile and effective method for exfoliated BP nanosheets provides a promising strategy for the exfoliation of other 2D materials.

关键词： Two dimensional materials black phosphorus Liquid exfoliation Solvothermal method

Synthesis and biological evaluation of dihydrotriazine derivatives as potential antibacterial agents

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Chinese Chemical Letters 2017年第8期28卷 1737-1742页

作者： Tian-Yi Zhang Chao Li Yu-Shun Tian Jia-Jun Li Liang-Peng sun Chang-Ji Zheng Hu-ri Piao Key Laboratory of Natural Resources of Changbai Mountain&Functional Molecules Ministry of EducationYanbian University College of PharmacyYanji133000China Department of Pharmacy Jilin Medical UniversityJilin 132013China

A series of 1,4-dihydro-1,3,5-triazine derivatives were designed and synthesized and their antibacterial and antifungal activities were evaluated. Most of the synthesized compounds showed potent inhibition of several Gram-positive bacterial strains（including multidrug-resistant clinical isolates） and Gramnegative bacterial strains, with minimum inhibitory concentrations（MICs） in the range of 2.1–181.2 mmol/L. Compounds 7a and 7c presented the most potent inhibitory activities against Grampositive bacteria（e.g., Staphylococcus aureus 4220）, Gram-negative bacteria（e.g., Escherichia coli 1924）,and the fungus Candida albicans 7535, with MICs of 2.1 or 4.1 mmol/L. Especially, compound 7a was the most potent, with an MIC of 2.1 mmol/L against four multidrug-resistant, Gram-positive bacterial *** cytotoxic activity of the compound 7a, 7c and 7f was assessed in HepG2 cells, and the results suggest that 1,4-dihydro-1,3,5-triazine derivatives bearing a 6-benzyloxynaphthalen moiety are interesting scaffolds for the development of novel antibacterial agents.

关键词： Antibacterial activitis Antifungal activities Cytotoxicity Minimal inhibitory concentration 1 4-Dihydro-1 3 5-triazine

A model for transient diffusion in bidisperse pore structures

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Petroleum Science 2019年第6期16卷 1455-1470页

作者： Wei sun Sheng-Li Chen Ming-ri Xu Ya-Qian Wei Ting-Ting Fan Bao-Li Ma Jin-Tao Guo State Key Laboratory of Heavy Oil Processing and Department of Chemical Engineering China University of PetroleumChangpingBeijing 102249People’s Republic of China Daqing Petrochemical Research Center CNPCDaqing 163741HeilongjiangChina

A bidisperse model for transient diffusion and adsorption processes in porous materials is presented in this *** mathematical model is solved by numerical methods based on finite elements combined with the linear driving force approximation.A criterion based on the model to identify the diffusion controlling mechanism(macropore diffusion,micropore diffusion,or both)is *** effects of different adsorption isotherms(linear,Freundlich,or Langmuir)on the concentration profiles and on curves of fractional uptake versus time are *** addition,the influences of model parameters concerning the pore networks on the fractional uptake are studied as well.

关键词： Transient diffusion Adsorption Bidisperse pores Macropore Micropore Linear driving force

Inheritance and Innovation of Engineering Management Informatization

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Frontiers of Engineering Management 2014年第1期1卷 76-82,116-117页

作者： Kai sun Ren-huai Liu Jinan University

In the life-cycle of large projects, the operational phase lasts the longest, costs the most and substantially benefits the project. During the whole phase, energy, material and human resources may cost a lot. Effective control of such costs is one of the main targets of engineering management informatization. How to lower the organization collaboration cost in project management and how to support effective collaboration among different areas, organizations and departments in the ways of technology and management are major goals in engineering management informatization. In the phase of project operation, project owners, partners and customers are the stakeholders of engineering management informatization. Through the case of airport management informatization, inherited and innovation of engineering management informatization will be discussed. It is illustrated that airport informatization is the innovation of business model and technology applications through the analysis and study on cases of airport informatization.

关键词： engineering management informatization inter-organizational relationship management creation resource sharing

Base-free oxidative esterification of 5-hydroxymethylfurfural to furan-2,5-dimethylcarboxylate over n-doped carbon-supported Co/Fe bimetallic catalyst under batch-operation or continuous-flow conditions

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Journal of Energy Chemistry 2022年第12期75卷 95-108,I0004页

作者： Weizhen Xie Binglin Chen Wenlong Jia huai Liu Zheng Li Shuliang Yang Xing Tang Xianhai Zeng Yong sun Xixian Ke Tianyuan Li Huayu Fang Lu Lin Xiamen Key Laboratory of Clean and High-valued Applications for Biomass Fujian Engineering and Research Center of Clean and High-valued Technologies for BiomassCollege of EnergyXiamen UniversityXiamen 361102FujianChina BiomassChem Group Faculty of Chemical EngineeringKunming University of Science and TechnologyKunming 650500YunnanChina Key Lab for Sport Shoes Upper Materials of Fujian Province Fujian Engineering and Research Center for New Functional Fiber Materials(Fujian Huafeng New Material Co.Ltd.Putian Dakai New Material Co.Ltd.)Putian 351144FujianChina

Developing an efficient and easily available catalyst for the selective conversion of biomass-derived 5-hydroxymethylfurfural(HMF)into furan-2,5-dimethylcarboxylate(FDMC),a valuable biomass-based monomer,remains a high demand but formidable ***,a facile strategy for the synthesis of N-doped carbon-supported Co/Fe bimetallic catalyst(CoFe-NC)was developed,which provided an outstanding FDMC yield of 93%in a batch reactor(base-free,80℃,2 bar O_(2),4 h).Interestingly,CoFe-NC also gave a high FDMC yield of 91%under continuous-flow conditions for 80 h(5 bar O_(2),80℃,GHSV 1320 h^(-1),LHSV 0.6 h^(-1),base-free).Notably,it is the first time that a non-noble catalyst gave such a high FDMC yield under continuous-flow *** introduction of Fe could greatly improve both the electron intensity of Co-N_(x)species and basicity of the catalyst,which endowed CoFe-NC with improved O_(2)activation capacity and enhanced dehydrogenation activity for the oxidation-esterification of *** work delineates the efficient strategy on the construction of N-doped carbon-supported non-noble catalyst,which might open a new avenue for developing highly efficient catalyst for FDMC production.

关键词： 5-Hydroxymethylfurfural Furan-2,5-dimethylcarboxylate Oxidation-esterification Catalysis Co-N_(x)sites

Leydig cell transplantation restores androgen production in surgically castrated prepubertal rats

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Asian Journal of Andrology 2009年第4期11卷 405-410页

作者： Jie sun Ye-Bin Xi Zhong-De Zhang Ping Shen huai-Yuan Li Min-Zhi Yin Wei-Yi Li Cheng-Ren Shi Department of Urology Shanghai Children＇s Medical Center Shanghai 200127 China Department of Immunology Shanghai Jiao Tong University School of Medicine Shanghai 200025 China Department of Pathology Shanghai Children＇s Medical Center Shanghai 200127 China Department of Clinical Laboratory Shanghai Children＇s Medical Center Shanghai 200127 China Department of Pediatric Surgery Xin Hua Hospital Shanghai Jiao Tong University Shanghai 200092 China

Prepubertal testicular dysfunction and the subsequent development of hypogonadism affects an estimated one in 200 children worldwide. As the testosterone levels are dynamic during development and puberty, traditional hormone treatment regimens are often inadequate, thereby leaving associated physiological conditions unresolved. Therefore, we have investigated the potential therapeutic effect of mature Leydig cell transplantation for the treatment of prepubertal primary hypogonadism through the use of a surgically induced hypogonadistic rat model system. In the experiment, Leydig cells were surgically isolated from mature Sprague-Dawley rats and transplanted into prepubertal recipients. Serum testosterone levels and microscopic analysis of the stained testicular interstitium were compared with sham-treated controls, as well as with castrated and intact rats during sexual development. At 4 weeks post-implantation, serum testosterone was detectable in Leydig cell recipients, but not in surgical controls, and progressively increased as a function of time until reaching levels comparable with sexually mature males at 12 weeks post-implantation. Histological analysis revealed a high rate of Leydig cell survival as well as steroidogenic secretory activity. Therefore, we conclude that mature Leydig cell transplantation in prepubertal hypogonadism recipients has therapeutic potential in rats and merits further investigation for clinical application.

关键词： androgens Leydig cells male hypogonadism testis