工程量清单招投标的实践探索

根据《中华人民共和国招标投标法》实施中的有关问题，探讨了采用工程量清单方式招投标的合理性和可行性，并给出了采用工程量清单法进行招投标的过程与步骤。     

大红山铜矿岩体结构调查分析

大量工程实践已证明岩体结构是控制岩体稳定性的重要影响因素。为此，以大红山铜矿为研究背景，在选定有代表性调查地段的基础上，引入详细观测线法对其岩体结构进行了详细调查与统计。分析结果表明：调查区域内巷道岩体节理裂隙比较密集和发育，主要发育有倾向N53E、走向N37W、倾角53°，倾向W26S、走向N36W、倾角68°；倾向E1S、走向NIE、倾角89°的三组优势结构面，其中优势结构面第二组和第三组构成不稳定块体，并且断层及软弱夹层比较发育，加剧了巷道的破碎程度，对巷道围岩的稳定性有控制作用。最后提出了在巷道施工中密切注意围岩稳定性变化，避免工程事故的发生的建议。     

我国详细城市设计的作用与意义的再认识

20多年来我国城市设计实践取得了一定的成绩,但随着城市设计工作的普遍开展,其隐藏已久的深层次矛盾逐渐突现.通过对我国近年来具有代表性的详细城市设计实践项目的研究,探讨其在体制认可与法律保障,与详细城市规划关系等方面存在的问题,进而对我国详细城市设计的作用与意义进行反思与再认识,提出建立与管理相对接的城市设计的现实意义.     

Investigation on extremal and critical characteristics of ignition time for H<Subscript>2</Subscript>/O<Subscript>2</Subscript> combustion system and their applications

The L, H and C curves in P-T phase are proposed to describe the minimal, maximal and critical characteristics of ignition time of H₂/O₂ combustion system, respectively. The features of H₂/O₂(Air) combustion system, including explosion or not as well as the time delay to achieve its explosion status, can be well shown by explosion limits and these proposed curves. These curves can be described by 1.2k ₁=k _s [M_s], (k ₁₁/k ₁₀+1)k ₁=k _s [M_s], and 2k ₁=k _s [M_s], respectively, which provide a physical explanation for these curves and give another way to establish them. Based on the contour of ignition time, the Z-type explosion limits can be explained by thermal explosion theory. Furthermore, the ignition distance of supersonic combustion is predicted according to the ignition time obtained in a Semenov system, which is very reasonable.     

控制性详细规划创新研究

本文在创新的控制性详细规划编制中,引入＂区域分析法＂进行深入分析,从指导思想和规划理念上保证规划编制准确的方向.创新的控制性详细规划控制体系,实行通则、控制单元图则和地块详细控制图则三位一体控制模式：通过科学细致的分析研究,制定当地的规划通则,并作为控制单元图则与地块详细控制图则编制的主要依据;运用＂分区平衡方法＂对控制单元进行总量控制,运用＂二元控制方法＂控制城市规划布局建设;划定＂六线＂、标明禁止开口路段与主要出入口、确定各项控制指标,并对用地性质兼容与土地开发强度进行弹性控制.     

城市居住区详细规划中的生态设计

首先提出在居住区规划中进行生态设计的理念及这一设计要依据的原則和生态学原理,然后概括出其涉及的主要内容与具体设计方法.     

工程量清单招标中应用的计算机辅助系统

在工程量清单招标中，通过计算机辅助完成招标、评标、定标工作，极大地提高了工作效率和效益。     

Controller Design Using Ant Colony Algorithm for a Non-inverting Buck–Boost Chopper Based on a Detailed Average Model

In this article, the non-inverting buck–boost converter and its operation modes are scrutinized. The closed-loop stability of the converter in buck and boost modes is analyzed, and the necessity of using an appropriated controller is demonstrated. Then the application of an adapted ant colony optimization to design a feedback controller is proposed, and a controller based on its existing model is tuned. Simulation and experimental results obtained from the ant colony optimization designed controller are then compared with a controller designed with the classic method. Although the simulation and experimental results prove the efficiency of the proposed control approach, a significant difference between controller behavior in practice and simulation is obvious. Finding these differences, more detailed models, including all parasitic elements, in the buck and boost modes are derived. Applying the proposed model in controller design illustrates that the desired performance of the converter can be guaranteed with a simple proportional-integral (PI) controller. The suggested ant colony-based controller is again tuned based on the more detailed model, which improves the performance of the converter system even more. Furthermore, good agreement between analytical and experimental outputs validates the accuracy of the modeling and simulation.     

大同南站清水混凝土双胞胎柱施工工艺

以大同南站高架厅清水混凝土支撑柱为研究对象,分析总结了清水混凝土双胞胎柱的深化设计方法、模板加固工艺、柱体接缝处理措施、预埋件安装方法以及混凝土浇筑的质量控制要点等.工程实施效果较好,可为类似的清水混凝土异形柱施工提供参考.