ASU Electronic Theses and Dissertations
This collection includes most of the ASU Theses and Dissertations from 2011 to present. ASU Theses and Dissertations are available in downloadable PDF format; however, a small percentage of items are under embargo. Information about the dissertations/theses includes degree information, committee members, an abstract, supporting data or media.
In addition to the electronic theses found in the ASU Digital Repository, ASU Theses and Dissertations can be found in the ASU Library Catalog.
Dissertations and Theses granted by Arizona State University are archived and made available through a joint effort of the ASU Graduate College and the ASU Libraries. For more information or questions about this collection contact or visit the Digital Repository ETD Library Guide or contact the ASU Graduate College at gradformat@asu.edu.
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- Creators: Mobasher, Barzin
本课题发现当前的政务平台逐步引入PPP模式,借助社会资源开发政务平台。但是,PPP模式是否有利于政务平台的建设,受到哪些因素的制约,如何更好地利用PPP模式进行开发工作,这些问题在现前的研究中没有得到很好地探索。带着这些问题,本课题对PPP模式在政务平台建设中的作用进行了深入剖析。主要研究内容如下:
在第一部分中,本课题政府公共服务和政务相关理论进行了全面整理,发现政务平台要想走出一条健康发展之路,需要借助社会资源进行市场化,而PPP模式符合当前政务平台建设的需要。本文对PPP模式在国内外电子政务的应用进行了分析,提出了本文的研究主题。
在第二部分中,本文对华东地区50座城市的政务平台进行了调研,对常见问题进行了整理,发现PPP模式已经广泛应用于政务平台建设中,且主要有四种模式,本文对50座城市的政务平台建设情况进行了数据采集,并进行了深入分析。
在第三部分中,结合调研现状和文献研究成果,提出了PPP模式影响政务平台建设的相关假设,并构建了计量模型。通过短面板分析验证假设,并进行了Robust分析,证实结论的普适性。
在第四部分中,本文分析了研究结果,认为政务平台采用PPP模式能够有效促进政务平台的建设水平,提高用户满意度;并且PPP模式与合作企业的估摸、信息的透明程度和平台的交互能力存在显著的交互作用,共同影响用户对政务平台的评价。政府引入PPP模式,充分对接可利用资源,并加强盈利控制,对当前政务平台的建设是具有积极意义的。
第一,界定政府充分授权下水环境企业战略联盟内涵,分析其形成的理论基础、水环境企业战略联盟的类型、发展差异性及战略联盟动因。通过梳理战略联盟理论国内外研究现状回顾及评述,提出政府充分授权下水环境企业战略联盟模式研究的主要问题。
第二,探索政府充分授权下水环境企业战略联盟模式的影响因素。通过对水环境基础设施战略联盟项目合同关键内容的深入分析,识别出政府充分授权下水环境企业战略联盟模式的关键影响因素。
第三,实证分析各关键因素对政府充分授权下水环境企业战略联盟模式效果的影响。运用回归分析方法对项目规模、政府政策、监督管理、激励机制、风险分配和投资回报对联盟模式效果的影响进行实证检验,验证了各影响因素对政府充分授权下水环境企业战略联盟模式效果的正向作用。
最后,对政府充分授权下水环境企业战略联盟模式影响因素及作用研究的结论进行总结。
The utilization of alternative techniques such as MICP requires an in-depth understanding of the particle-scale contact mechanisms and the ability to predict the improvement in soil properties resulting from calcite precipitation. For this purpose, the discrete element method (DEM), which is extensively used to investigate granular materials, is adopted in this dissertation. Three-dimensional discrete element method (DEM) based numerical models are developed to simulate the response of bio-cemented sand under static and dynamic loading conditions and the micro-scale mechanisms of MICP are numerically investigated. Special focus is paid to the understanding of the particle scale mechanisms that are dominant in the common laboratory scale experiments including undrained and drained triaxial compression when calcite bridges are present in the soil, that enhances its load capacity. The mechanisms behind improvement of liquefaction resistance in cemented sands are also elucidated through the use of DEM. The thesis thus aims to provide the fundamental link that is important in ensuring proper material design for granular materials to enhance their mechanical performance.