PPP 项目再谈判关键风险因素识别与操作规程设计

为更有效地提供基础设施与公共服务,PPP 项目在我国开始大力推广。但由于 PPP 合同的不完善性以及长特许期内的不可预测风险,PPP 项目再谈判在实施过程中极易发生。为了减少不必要的再谈判,避免 PPP 再谈判带来的管理效率降低、公共资源浪费等问题,识别了 PPP 项目再谈判关键风险因素,并基于中国的实情与国际经验,设计了 PPP 项目再谈判的操作规程,包括发起预审机制、再谈判流程、监管机制等。邀请具有 PPP 项目管理实践经验的政府管理人员、私人投资者、咨询公司与学者,对设计的操作规程进行验证。该谈判操作规程能为政府提供借鉴,以促进 PPP 健康有序的发展。     

基于五元联系数的 PPP 项目风险评价研究

为实现对 PPP 项目风险的动态分析与管理,将集对分析理论运用于 PPP 项目风险评价中。通过文献阅读、专家访谈及实地调研对 PPP 项目风险进行识别,建立 PPP 项目风险评价指标体系;通过问卷调查对 PPP 项目风险等级进行评判,利用 AHP 法确定指标权重;依据五元联系数及偏联系数理论进行各风险指标的集对势分析,构建基于五元联系数的 PPP 项目风险评价模型,并进行实证分析。研究结果表明,基于五元联系数的 PPP 项目风险评价模型能明确风险态势,使项目管理者及时把握风险发展趋势,对可能出现的风险采取有效的风险管理手段,实现从动静结合角度对影响 PPP 项目的风险因素的准确有效控制。     

基于组织界面的 PPP 项目政府责任实现机理分析

针对 PPP 项目失败案例中的政府职能错位、越位和缺位导致政府责任未能充分实现的问题,基于组织界面理论,将 PPP 项目政府责任界面识别为纵向、横向和斜向 3 个组织界面和对应的 20 个具体影响因素;通过 BP-DEMATEL 模型遴选出政府责任实现的 8 个关键因素;运用系统动力学分析关键因素在各组织界面中对 PPP 项目政府责任实现的影响机理,并提出了政府责任实现的路径。     

基于全生命周期理论的公共基础设施PPP 项目风险动态评价

PPP 模式目前在公共基础设施项目中应用十分广泛。因 PPP 项目具有复杂性、周期长、融资需求量大等特点,导致 PPP 项目风险种类多且难以定量控制与管理。将全生命周期理论引入 PPP 项目风险评价当中,借助 AHP 方法,建立基于全生命周期理论的公共基础设施 PPP 项目风险动态评价模型,按照项目识别、项目准备、项目采购、项目执行和项目移交 5个阶段,对各个阶段风险进行横向及纵向动态评价,通过该模型对 PPP 项目中的风险实现动态评价,从而降低 PPP 项目全生命周期过程中的风险,以期使得 PPP 项目得到顺利实施。     

中东市政污水处理工程BOT模式分析

根据中东某城市的实际特点以及周边的工业情况,开展该城市市政污水处理厂以及配套管网工程BOT项目合作模式的分析和探讨,分析污水处理工艺方式以及项目盈利模式的论证,研究国外市政污水处理BOT项目的可行性,为在周边城市及国家开展类似项目提供借鉴。     

基于GPRS的环境噪声监测系统的设计与实现

针对环境噪声监测中多点声级数据采集以及实时传送的要求,提出了基于分组无线业务(GPRS)的新型环境噪声监测系统,实现环境声级数据的远程、快捷及低成本传输.提出了系统的总体设计方案,详细分析了系统的组网方案以及PPP网络连接和Socket编程等关键技术,实现了监测中心与监测终端之间的实时命令控制及数据传输,最后系统引进了低成本策略降低了使用成本,突破了系统的应用局限性,使该系统在环境噪声监测及控制领域具有良好的应用价值.     

基于GPRS的电力系统远程监控设计与研究

以电力远程监测系统领域现阶段的技术为参考,提出了一种基于GPRS无线通信技术和以ARM为内核的高性能的嵌入式微处理器的电力远程监测系统。首先简述了GPRS无线业务特点及其嵌入式系统技术,然后重点介绍了基于GPRS的电力线路监控系统的组成、原理,给出了硬件原理图,对具体的软硬件设计过程进行了简要的阐述。实践证明GPRS技术非常适用于要求实时性的、大数据量传送的应用场合。     

TP53-Induced Glycolysis and Apoptosis Regulator (TIGAR) Is Upregulated in Lymphocytes Stimulated with Concanavalin A

The glycolytic modulator TP53-Inducible Glycolysis and Apoptosis Regulator (TIGAR) is overexpressed in several types of cancer and has a role in metabolic rewiring during tumor development. However, little is known about the role of this enzyme in proliferative tissues under physiological conditions. In the current work, we analysed the role of TIGAR in primary human lymphocytes stimulated with the mitotic agent Concanavalin A (ConA). We found that TIGAR expression was induced in stimulated lymphocytes through the PI3K/AKT pathway, since Akti-1/2 and LY294002 inhibitors prevented the upregulation of TIGAR in response to ConA. In addition, suppression of TIGAR expression by siRNA decreased the levels of the proliferative marker PCNA and increased cellular ROS levels. In this model, TIGAR was found to support the activity of glucose 6-phosphate dehydrogenase (G6PDH), the first enzyme of the pentose phosphate pathway (PPP), since the inhibition of TIGAR reduced G6PDH activity and increased autophagy. In conclusion, we demonstrate here that TIGAR is upregulated in stimulated human lymphocytes through the PI3K/AKT signaling pathway, which contributes to the redirection of the carbon flux to the PPP.     

A review of studies on Public–Private Partnership projects in the construction industry

Public–Private Partnership (PPP) in construction is gaining in popularity. Although papers published in major journals have documented real cases of PPP projects, there appears to be a lack of systematically summarizing what they have already provided. Consequently, this paper reviewed PPP studies published in the six top journals in the construction field. The objectives are to compare and contrast the findings of the studies so as to provide insights for directing further PPP research and improving the existing practices of PPP projects. To achieve the review objectives, studies were first classified as either empirical or non-empirical. Empirical studies were further grouped under three themes: risks, relationships, and financing. Non-empirical studies were grouped under five themes: financing, project success factors, risks, and concession period. Suggestions for further research are risks, financing, contractual agreements, development of PPP models, concession periods, and strategies in choosing the right type of PPP.