Ecosystem Analysis on ASP Market and Providers′ Strategies

ASP的生态系统是复杂和动态的,涉及众多参与者。从商业生态系统的角度出发,全面分析ASP生态系统、主要参与者、价值网络、缝隙市场以及ASP提供商的宏观战略选择。总体来讲,ASP市场具有生态系统的显著特征,ASP提供商应将自身看成是商业生态系统有机体的一部分,从生态系统的角度思考自身的战略选择,有利于ASP商业生态系统的健康发展。The ecosystem of ASP is complex and dynamic,including many participators.From the perspective of business ecosystem,this paper analyses the comprehensive ASP ecosystem,major participators,value network,niche market and macro strategy choice of ASPs.In general,ASP market has significant characteristics of ecosystem,therefore,ASPs should regard themselves as one part of ecosystem and make their strategic choice from the perspective of ecosystem.This will benefit the development of ASP business ecosystem.福建省科技重大项目《面向中小企业制造业信息化ASP应用研究》,项目编号:2004HZ0

组织间协调机制演化的实证分析

基于文献分析,本文采用问卷调查和实地访谈的方法,研究组织间协调机制问题。研究发现:有机地整合任务结构、决策结构、代理结构、信息结构和知识管理等协调视角,综合应用形式化与非形式化的协调方式,是设计有效协调机制的两个重要方面,它们受到来自组织间关系中的相互依赖、不确定性、相互信任、关系准则以及项目属性等因素的影响;同时,这些因素是动态变化的,其原因在于知识与经验的积累、关系绩效的变化、机会主义的行为表现、关系强度的变化以及合作项目的改变等。因此,有效的协调机制也必须是动态演化的

实物期权在IT投资中的应用评述

在文献基础上,对实物期权方法在管理IT投资方面的应用进行综述,包括IT投资的风险分析、实物期权的分析角度与框架、实物期权在IT投资策略中的应用等,并指出实物期权方法运用的问题与困难,以及需要进一步研究的领域

Preparation of Alginate-starch Blend Microspheres for Controlled Release of Berberine Hydrochloride

作者简介: 江宇良( 1985) , 男(汉族) , 江西樟树人, 现为厦门大学生物化 工专业在读硕士研究生, 主要从事生物材料研究工作.[中文文摘]目的应用天然药用高分子材料海藻酸钠和淀粉制备复合微球并研究其对盐酸小檗碱的控制释放性能。方法采用改进的乳化凝胶法制备复合微球,用光学显微镜观察了微球的形态,共聚焦激光扫描显微镜观察了药物的分布情况,紫外分光光度计测定了药物包封率,并测定了药物在不同介质中的释放。结果微球形态圆整,分散性好,包封率可达到80%以上,对盐酸小檗碱具有一定的缓控释效果。结论以海藻酸钠和淀粉为原料制备了性能良好的复合微球。 [英文文摘]Objective To prepare blend microspheres natural polymers alginate and starch and to study their controlled release performance on berberine hydrochloride.Methods A modified emulsification/gelation method was applied to prepare blend microspheres.Shape of those microspheres was observed with optical microscope.Drug distribution inside the Microspheres was observed with CLSM.Encapsulation efficiency was determined by UV-spectrophotometer.Drug release performance in two medium was also tested.Results Microspheres appeared to be spher ica l and w ell d ispersed in w ater. Encapsu lation effic iency was higher than 80%. M icrospheres was found to have a certa in effect on the contro lled release of berber ine hydroch lo ride. Conclusion B lend m icrospheres w ith good perfo rmancew ere prepa red w ith a lg ina te and starch国家自然科学基金(No.50573063)，教育部新世纪优秀人才计划项目(No.NCET-05-0566)，高等学校博士点专项基金(No.2005038401

海水富营养化评价方法的研究进展与应用现状

简要概述了海水富营养化的概念及对生态系统的影响。介绍了几类常用的海水富营养化评价方法,包括单因子法、富营养化指数法、水质指数法和营养状态质量法等国内常用的评价方法,以及近年来国际上发展起来的以富营养化症状为考虑因素的第二代海水富营养评价方法,包括综合评价法、河口富营养化评价法和波罗的海行动计划等,第二代方法的评价标准更为细化,对富营养化带来的环境效应也提供一定的判断标准。阐述了现阶段我国海水富营养化评价方法的应用现状,尤其是在近海河口区域针对富营养化程度进行的区域等级划分,旨在提出各种海水富营养化评价方法应用现状和特点,为不同海域在选用富营养化评价方法提供参考。最后,对海水富营养化评价的应用方向提出未来展望,给出水质监测管理以及海洋生态环境灾害预测防御的指导性建议。国家重点研发计划海洋环境安全保障专项“中国近海与太平洋高分辨率生态环境数值预报系统”(编号:2016YFC1401605);;国家自然科学基金青年科学基金项目“南海低营养级生态模型营养盐循环过程的数值模拟研究”(编号:41206023)资助~

我国制造业集群升级的影响因素研究

本文围绕核心企业转型和集群成员互动与集群升级的内在关系这一基本问题进行研究,发现即便是核心企业转型成功也有可能弱化本地集群,只有当其转型通过集群成员实现资源整合协同效应时,转型才能带动整体集群升级发展。本文探寻实现核心企业转型与产业集群协同之间的良性互动机制,以期为寻求我国产业集群持续的成长动力与竞争优势提供相应的建议和对策。华侨大学中央高校基本科研业务费资助项目·哲学社会科学青年学者成长工程项目“我国区域集群网络升级动力研究”(13SKGC-QG14

A new activity model for polymer-solvent systems

A new molar excess Gibbs energy (G~ E ) expression for the correlation of vapor-liquid phase behavior for polymer solutions was developed from the Gibbs-Helmholtz relation, and a new activity model for polymer solutions based on the G~ E expression was then derived by accounting for the free volume effect.The model includes a combinatorial part, a residual part and also a free volume part.The calculated results by the present method were compared with those from the EFV,UFV and UNIFAC models.The average absolute deviation of solvent activities in 14 polymer solutions was 8141% for EFV , 7174 % for UFV, 19105% for UNIFAC and 3152% for the present model1 It is shown that the present model yields improved results over the other models and is able to describe the phase behavior for some polymer solutions over a wide range of concent ration.国家自然科学基金项目(50573063);高等学校博士点专项基金(20050384013)

Molecular simulation of transport behavior of penetrant through silicon-containing polymers

选择PCFF和COMPASS分子力场对橡胶态聚合物PDMS和玻璃态聚合物PS1体系进行模拟。COMPASS力场模拟得到的体系密度,O2和N2在PDMS与PS1中扩散系数更接近实验值。在模型大小一定时,Group-based求和法中截断距离越长,耗用机时越长,但对计算结果改进不大;截断距离为1.3nm时计算结果最好。Ewald方法耗时多而对计算结果却无明显改进。体系大小对扩散系数的计算值影响甚微。体积越小的分子,在聚合物中运动的范围越大,扩散系数越大。氧气和氮气分子在PDMS与PS1中运动轨迹不同,在PS1中氧气运动范围远大于氮气,而在PDMS中氧气运动范围稍大于氮气。小分子运动轨迹基本与聚合物自由体积分布对应,自由体积分数大,扩散系数也大。PCFF and COMPASS force fields were used to describe PDMS and PS1 polymeric systems and to estimate the diffusion coefficient of N2 and O2 through the PDMS and PS1 matrices at 298 K by molecular dynamics simulation.It was found that the COMPASS force field was better in describing the transport behavior of the penetrants.The calculated densities after refinement were in good agreement with the experimental results.The group-based and Ewald summation skills were used to estimate the non-bonded interaction between atoms.Calculation using the Ewald summation method took much longer time without bringing in obvious improvement in density estimation.Various cut-offs in using the group-based summation method did not produce densities with much difference, and the cut-off of 1.3 nm was the best.Two types of diffusions of the small molecules in the polymers were discussed.The diffusion of O2 and N2 in PDMS could be transformed from anomalous to normal motion in 30 ps; while their diffusion in PS1 would take 300 ps transforming from anomalous to normal state.The trajectories of diffusion of N2 and O2 in PDMS or PS1 were different.The motion area of O2 in the PS1 was much larger than N2; however, the former in the PDMS matrix was only slightly larger than the latter.The diffusions of O2 and N2 in the PDMS and PS1 were consistent with the free volumes of polymers.国家自然科学基金项目(50573063);; 高等学校博士点专项基金项目(20050384013)。~

HBeAg特异免疫复合物检测及临床意义

采用单克隆抗－ＨＢｅ固相ＥＬＩＳＡ法检测１１８例ＨＢＶ感染者血清中ＨＢｅＡｇ特异免疫复合物（ＨＢｅＡｇ／ＩＣ），结果表明∶ＨＢｅＡｇ／ＩＣ与ＨＢＶ复制相关，可作为ＨＢＶ复制的一种血清学标志，ＨＢｅＡｇ阴性、ＨＢＶＤＮＡ阳性者中，６２．２％患者ＨＢｅＡｇ／ＩＣ阳性，提示ＨＢｅＡｇ／ＩＣ的形成致使夹心法不能检出ＨＢｅＡｇ，这类患者仍可以是ＨＢＶ野毒株感染，并非均为ＨＢｅＡｇ缺陷变异株感染；ＨＢｅＡｇ／ＩＣ阳性血清ＡＬＴ异常率明显高于ＨＢｅＡｇ／ＩＣ阴性血清（Ｐ＜０．０１），提示ＨＢｅＡｇ／ＩＣ存在与肝损伤有关

基于RBF神经网络补偿的一种绳牵引并联机器人支撑系统的力/位混合控制

为了保证用于风洞试验的绳牵引并联机器人支撑系统(Wire-Driven Parallel Robot Support System WDPRSS)的末端执行精度,设计了一种采用Hamilton-Jacobi Inequality(HJI)定理并基于RBF神经网络补偿的力/位混合控制。通过对WDPRSS的动力学建模分析,选择以位姿作为变量建立WDPRSS的整体动力学方程。将所设计的力/位混合控制代入到整体动力学方程中得误差闭环系统,对闭环系统进行稳定性分析,结果证明WDPRSS是趋于渐进稳定特性的。对八绳牵引的并联机器人支撑系统进行MATLAB/SIMULINK仿真实验,仿真结果表明所设计的力/位混合控制是正确有效的,满足控制精度要求,并将所设计的力/位混合控制与PD控制进行对比分析。最后,通过样机实验验证了所提控制方案的有效性。仿真实验和样机实验为在样机上进行技术实现提供了理论依据和实验基础