污水源热泵干渠取水降温后的可恢复特性

在调查并比较了热泵取水降温前后的渠温状态之后,基于渠温模型与调查结果预测了大、小温降的可恢复程度.由此定义并推导了可恢复性的准则关联参数φ与判定准则β,以及最小渠程与最大温降的关联式.结果表明:干渠条件特征值β由干渠、污水及土壤的结构与热物性参数描述,是所有问题的关键.不论大、小温降的渠温,均与原渠温一样向土壤地温接近,在一定的渠程范围内具有可恢复性.可恢复性由判定准则β、温降Δt及渠程z决定,与土壤地温无关.可恢复性准则式可用于指导工程上的渠水降温及对污水取热后的水处理工作的影响,在应用方面具有很大的意义.     

混凝土结构耐久性的修复性等级划分

采用修复费用、修复工作量、修复时间、可靠性、适修性、恢复性和环境属性7个指标，将混凝土结构耐久性修复等级划分为特修、大修1、大修2、中修1、中修2、小修1与小修2共7个等级，给出了各个等级的指标值。同时，应用模糊控制理论，建立了修复等级模糊划分的数学模型，以7个考核指标作为输入量对修复等级进行综合评判。该模型可在计算机上操作，具有一定的实用价值。     

混凝土结构耐久性的修复性评估方法

针对耐久性设计、修复设计和施工方案的优化，提出一种混凝土结构耐久性的修复性评估方法.基于结构全寿命周期成本理论，充分考虑了结构在不同时期的耐久性变化状况、成本组成及其时间价值，采用修复费用、修复工作量、修复时间、可靠性、耐久性、适修性、恢复性和环境属性8个指标，将混凝土结构耐久性修复等级划分为特修、大修1、大修2、中修1、中修2、小修1与小修2这7个模糊等级.采用模糊判断可信度确定各个指标的权重，并对修复性等级进行了多级模糊综合评判.结果表明，该评估方法客观而可靠，可为混凝土结构耐久性的修复提供指导.     

Mesh-Restorable Networks with Enhanced Dual-Failure Restorability Properties

We consider extensions of the most common mesh-restorable network capacity design formulation that enhance the dual-failure restorability of the designs. A significant finding is that while design for complete dual-failure restorability can require up to triple the spare capacity, dual failure restorability can be provided for a fairly large set of priority paths with little or no more spare capacity than required for single-failure restorability. As a reference case we first study the capacity needs under complete dual-failure restorability. This shows extremely high spare capacity penalties. A second design model allows a user to specify a total capacity (or budget) limit and obtain the highest average dual-failure restorability possible for that investment limit. This formulation, and a relationship between dual-failure restorability and availability, can be used to trace-out the capacity-versus-availability trade-off curve for a mesh network. A third design strategy supports multiple-restorability service class definitions ranging from best-efforts-only to an assurance of complete single and dual-failure restorability on a per-demand basis. This lets a network operator tailor the investment in protection capacity to provide ultra-high availability on a service-selective basis, while avoiding the very high investment that would be required to support complete dual-failure restorability of the network as a whole.     

计及多阶段抗灾性能的骨干网架多目标优化

构建抗灾型骨干网架并对其进行差异化加固,可以保障极端灾害下电网安全运行和重要负荷供电。在此背景下,提出一种计及多阶段抗灾性能的骨干网架多目标优化模型。该模型定量评估了电网中节点和线路的拓扑和运行重要度,并提出基于核主元分析的综合评估方法。在满足投资限制的基础上,以最大化网架生存性、抗毁性和系统可恢复性为目标对抗灾型骨干网架进行优化。然后,采用嵌入图论修复策略和档案学习策略的改进全面学习粒子群优化算法求解优化模型,以扩大可行解空间。最后,某区域电网仿真算例验证了该模型的有效性。     

基于概率的单自由度体系震后残余变形计算

准确预测结构的震后残余变形,对于结构震后性能控制及建立考虑可修复性的抗震设计方法具有重要意义。通过对不同参数的双线性单自由度（SDOF）体系分别在100条标准地震动输入下弹塑性地震反应的统计分析,研究了模型参数和地震动不确定性对SDOF体系残余变形和最大弹塑性变形的影响;建立了双线性SDOF体系震后残余变形的概率计算模型。结果表明：不同地震动输入下SDOF体系的残余变形与最大弹塑性变形之比（dR/dm）存在明显的离散性,且离散程度与结构的刚度比、自振周期、相对屈服荷载系数及峰值地面加速度相关;dR/dm的统计分布规律服从对数正态分布,基于该分布函数建立的计算模型可对给定超越概率条件和地震水平下SDOF体系的震后残余变形进行预测。通过典型算例分析认为,可以采用所建议的模型进行SDOF体系震后残余变形分析及可修复性评估。     

成形对材料力学性能的影响及恢复性能热处理

对ASME和GB150关于成形的术语的定义和分类进行了比较；分析了各类成形工艺对材料性能的影响；对于恢复材料性能和改善材料性能热处理及所用试件进行了讨论。     

Shared-Risk Logical Span Groups in Span-Restorable Optical Networks: Analysis and Capacity Planning Model

In an optical transport network distinct logical groups of lightwave channels between neighboring OXC nodes (called spans) may sometimes be realized over a common physical resource such as a duct or conduit, and hence share a common cause of failure. This is closely related to the concept of shared risk on individual channels or links, called SRLGs, which is relevant to pre-planned path protection schemes with shared capacity on backup paths. But when considering span-restorable networks, shared risk over logical spans (not individual channels) is the corresponding issue of concern. This work considers several aspect of how such shared-risk span groups (SRSG) affect the protection capacity design and other aspects of span-restorable mesh networks. We provide a model for capacity planning any span-restorable network in the presence of a known set of such shared-risk spans and study the relationship between capacity requirements and the number and placement of such situations. This provides guidelines as to how many SRSGs can be sustained before the capacity penalty becomes severe and methods to diagnose which of them are the most limiting to overall protection efficiency. One finding of interest is that if a given percentage of all possible dual-failure combinations incident to a common node are allowed for in the design, then nearly the same percentage of other dual-span failure combinations (any two spans in the network) will also be restorable. We also show that designing a network to withstand even a small number of multi-span co-incident spared-risk span groups will yield a significant improvement in overall dual-failure restorability and hence also in network availability.Presented at Optical Networking and Communications Conference (Opti Comm 2002), Boston, MA, USA, July-August 2002.     

三维复合絮垫的压缩性能影响研究

研究并分析了中空三维织物对絮垫压缩性能的影响。研究表明,三维织物填充纤维所制得的纤维絮垫在受到压缩作用时,产生的压缩变形及恢复性能明显得到改善;其中以方形织物受到压缩产生变形较低,以X型三维织物填充絮垫的恢复性能最佳,三角形结构提升稍低。     

二灰碎石材料再生机理研究与验证

通过室内试验及试验路段验证,从二灰碎石结构强度形成、强度再生机理、外掺剂对再生性规律影响等进行理论分析,得出二灰碎石基层早期强度破坏后,具有一定程度再生的科学结论。