催化剂颗粒热稳定性的探讨

本文通过理论分析，得出了保证固定床反应器内催化剂颗粒实现稳态操作所需线速度的确定原则，可作为生产控制和设计的依据。     

Problems Facing Parties Involved in Build, Operate, and Transport Projects in Egypt

One of the newest financial schemes for environmental projects is the Build, Operate, and Transfer (BOT) concept, which is being used increasingly worldwide as a project delivery system by which governments obtain the infrastructure projects by private sector after a concession period free of charge. In the Egyptian environment up to now, promoters and investors have had many fears toward declared projects. This study aims to investigate the potential for implementing the BOT system in the Egyptian environment. This can be achieved by giving a clear view of BOT and of its problems, risk areas, and features, pertaining to the Egyptian environment, in order to maximize the benefits and minimize the risks as much as possible. The collected data was analyzed based on actual implementation in Egypt. This involved the following: (1) An overview of the critical success factors in order to achieve a BOT project; (2) an analysis of results obtained from questionnaires seeking to determine the possibility of occurrence of the different risk factors in the Egyptian environment, and their ranking; (3) a comparison between the questionnaire results and the actual risks from requests for the proposal of locally advertised projects; and (4) a determination of the missed critical success factors in the Egyptian environment. The main conclusion of this study is that three critical success factors are essential for the success of BOT projects in Egypt: (1) Picking the right project; (2) competitive financial proposal; and (3) special features of bid.     

Genie辐射测量系统介绍

介绍了世界著名的核仪器生产厂家美国ＣＡＮＢＥＲＲＡ集团公司的主流谱学系统Ｇｅｎｉｅ系统及其特点，比较详细地剖析了Ｇｅｎｉｅ－ＰＣ系统的硬件构成和软件结构以及网络特性，并给出了Ｇｅｎｉｅ－ＰＣ系统的标准配置，同时对用户关心的一些问题也进行了讨论。     

数据包络和系统重构分析在水泥生产中的应用

为优选出水泥生产的运转参数的合理范围，对冀东水泥厂NSF窑运转参数与水泥强度及能耗有关的78个记录进行数据包络分析，从中挑选出热耗低而熟料的28d与3d强度高的相对有效记录6个，再对这6个记录进行系统重构分析，找出了影响热耗、熟料28d与3d的强度的主要因素及各因素比较合理的取值范围。     

Optimized real options-based approach for government guarantees in PPP toll road projects

The uncertainty associated with future traffic levels in Build–Operate–Transfer toll road projects lead to difficulties in obtaining finance and thus to unsuccessful bids. In order to increase the attractiveness of projects for investors, governments usually provide several types of guarantees such as Minimum Revenue Guarantees (MRGs). In many cases, challenges associated with the valuation of this uncertainty force governments to provide excessive guarantees, placing an increased burden on the public budget. Based on this problem, a real-option-based model is presented for the identification of optimum upper and lower boundaries of compound MRG and Maximum Revenue Cap (MRC) options which establish a fair risk allocation structure. The proposed model uses an optimization approach in which high levels of guarantees in initial years are compensated by the transfer of excess revenues obtained by the private investor in late years. The optimum upper and lower boundaries of compound MRG and MRC options are identified using the proposed model. Results reveal that the emerging net guarantee amount generated by using any pair values of the MRG and MRC that remain in the identified interval not only maintains the attractiveness of project for private investors but also restrains government contingent liabilities. Thus, the identified interval of MRG and MRC enables the structuring of a flexible bargaining environment for both parties.     

Alternative Concession Model for Build Operate Transfer Contract Projects

This paper develops an alternative concession model for build operate transfer (BOT) infrastructure projects. The concession period is a measure for deciding when the project ownership will be transferred from the investor back to the government concerned; it also demarcates the benefits, authorities, and responsibilities between the government and private investors. Previous studies have developed various techniques and methods, mainly suggesting proper organization structure, contracting procedures, methods of project financing, and risk allocation strategies when BOT-contract projects are implemented. These works have provided effective methodologies for the development of BOT contracts. Nevertheless, it appears that little has been undertaken in studying the way to determine the concession period in a BOT contract. This paper critically reviews the principles of establishing the concession period in a BOT contract. Such a review leads to developing a quantitative model for determining a proper concession period that can protect the interests of both the government concerned and private investors. An example is given that indicates how the alternative model can be applied to determine the concession periods of BOT infrastructure projects.     

无锁编程的探索与研究

在计算机多核技术迅速发展的时代,线程的优势越来越明显,多线程的学习成为每个程序员必备的基础。但在实际开发过程中,越来越多的异常,越来越多的死锁现象让每个程序员崩溃不已,线程与锁的问题凸显在每个程序员的面前。加锁技术大量应用于多线程技术的开发中,但由于加锁技术较为复杂,且调试困难,程序员们更加期望从另一个角度来缓解问题。Lock-free概念应运而生。     

Windows下PC机与DSP串行通信的底层研究

在Windows环境下一般较难直接操作计算机底层硬件。在C Builder平台下通过直接操作INS8250内部寄存器实现了PC机与下拉机DSP的串行通信。并取得了良好的效果。这一方法同时可以被其他Windows平台借鉴。     

利用根轨迹法分析汽车结构参数对操纵稳定性的影响

利用根轨迹法对汽车操纵稳定性的影响因素进行了研究,对三自由度模型中的结构参数也进行了研究,通过比较,得出各结构参数影响操纵稳定性的主次关系。     

城市“充电站”——无障碍便利设施设计

当今城市中无障碍设计既是热点问题也是颇有争议的问题。如何协调与现有城市建设的关系以及提高无障碍设施的使用效率,成为普及无障碍设施的难题。该文根据现有城市无障碍设施的不足,提出以机械装置来代替传统建筑设计的构想;根据无障碍设施使用地的特点,设计不同的“功能个性单体”,选择性组合成契合使用地特色的无障碍设施,突破传统设计一对一的关系,实现一对多、多对多。以此期望为城市无障碍设施的普及和同类研究提供有益的借鉴。