灭火器的定位和有效性辨识研究

智慧消防是智慧城市建设的重要组成部分，在消防工作创新发展中发挥重要作用。灭火器作为扑救初期火灾的最普遍、最便捷和最广泛使用的灭火设施，在初期火灾的扑救和火灾防控中发挥重要的作用，其有效性和完好性是扑救初期火灾的必要条件。基于物联网及大数据的优势，建立消防灭火设施的定位与有效性辨识系统，并介绍系统的关键技术、网络架构、技术特征。此系统可对灭火器等消防灭火设施的伺应状态、完好性、有效性等功能特性进行跟踪巡检和辨识，以实现对灭火器的实时监控和智能化管理，促进消防设施建设的完善和优化，增强灭火系统的可靠性，充分发挥智慧消防技术在智慧城市建设中的优势。     

Optimal configuration of cluster supply chains with augmented Lagrange coordination

Enterprises in an industrial cluster could dynamically alliance in the form of cluster supply chains to share inner-cluster resources and services, and respond to the ever-fluctuating customer demands in a cost-effective way. However, an effective and feasible method enabling such dynamic cluster supply chain configuration (CSCC) lags behind practice due to the conflict of interests. Researchers are designing All-in-One theoretic models to optimize CSCC with the assumed decision details of all enterprises, while in fact clustered enterprises are seeking effective decentralized decision mechanisms which protect their decision autonomy in the frequently re-configured CSC. A newly emerged multi-disciplinary optimization method, Augmented Lagrangian Coordination (ALC), which supports the open-structure collaboration with strict optimization convergence, is thoroughly investigated in this paper and applied to solve the conflict. Through a complete analysis of CSC’s configuration policies in typical stages, a generic CSCC model is proposed and then partitioned into an ALC-based decentralized decision model by the typical decision autonomy distribution in clusters. Clustered enterprises collaborate vertically and laterally along the ALC model through multi-dimensional couplings to achieve the overall consistency and optimality. Results have proved the effectiveness of ALC for CSCC problem. A set of sensitivity analysis is also conducted to find out the condition in which an order has to be fulfilled in a CSC and the most appropriate configuration.     

Three-phased clustered topology formation for Aeronautical Ad-Hoc Networks

In-Flight Internet Connectivity (IFC) has become one of the crucial needs of passengers with technological improvements. The Aeronautical Ad-hoc Networks (AANETs) have been proposed by establishing air-to-air (A2A) links between aircraft to satisfy this need. However, the unstructured aircraft topology caused by their ultra-dynamic characteristics reduces the longevity of A2A links in AANET. This shorter longevity decreases the stability of AANET by accelerating the connection establishment/termination procedures between aircraft. Additionally, the shorter link longevity affects the packet transfer delay and the delivery ratio of AANET. To the best of our knowledge, these three challenges are not investigated simultaneously under one topology management model. This paper proposes a three-phased topology formation model for AANETs to increase the stability and packet delivery ratio in AANET with a shorter packet transfer delay. The first phase corresponds to the aircraft clustering formation, and here, we aim to increase the AANET stability by creating spatially correlated clusters. The second phase consists of the A2A link determination for reducing the packet transfer delay. Finally, the cluster head selection increases the packet delivery ratio in AANET. According to our simulations, we see that the stability and packet delivery ratio of AANET topology are roughly improved 35% and 31% with a 28% delay reduction compared to the methods in the literature.     

垃圾填埋场渗滤液回灌效果的理论研究

基于前人提出的垃圾填埋场渗滤波渗流模型，通过试验初步提出了评价回灌效果的指标和回灌有效期的概念，并分别考察了回灌水质、渗流参数及填埋深度对渗滤液中污染物浓度、微生物浓度和垃圾土中有机质溶解及降解的影响。分析结果表明，回灌能促进渗滤液中COD浓度的降低并加快垃圾土中有机质的降解；提高垃圾土的溶解速度，有利于减少垃圾土的有机质含量，同时不影响COD浓度的稳定；在相同回灌水质下，填埋越深则回灌的效果越不明显。     

海洋环境下混凝土中钢筋的防腐蚀设计

海洋环境下钢筋的锈蚀是影响混凝土结构耐久性的重要原因。通过简单分析海洋环境混凝土中钢筋锈蚀机理，提出了采用钢筋阻锈剂、环氧树脂涂层钢筋、热浸镀锌钢筋、不锈钢钢筋、纤维塑料筋，外加电流阴极保护法和牺牲阳极保护法等钢筋的防腐蚀方法。并综合分析比较了这些方法的工程适用性。     

Comparison of self-organizing maps classification approach with cluster and principal components analysis for large environmental data sets

Three classification techniques (loading and score projections based on principal components analysis (PCA), cluster analysis (CA) and self-organizing maps (SOM)) were applied to a large environmental data set of chemical indicators of river water quality. The study was carried out by using long-term water quality monitoring data. The advantages of SOM algorithm and its classification and visualization ability for large environmental data sets are stressed. The results obtained allowed detecting natural clusters of monitoring locations with similar water quality type and identifying important discriminant variables responsible for the clustering. SOM clustering allows simultaneous observation of both spatial and temporal changes in water quality. The chemometric approach revealed different patterns of monitoring sites conditionally named "tributary", "urban", "rural" or "background". This objective separation could lead to an optimization of river monitoring nets and to a better tracing natural and anthropogenic changes along the river stream.     

浙江大学紫金港校区西区概念性规划设计竞赛评析

建设具有显著办学特点和世界先进水平的研究型、综合型、创新型的一流大学,是浙江大学的总体发展目标.根据此发展目标,浙江大学紫金港校区西区概念性规划设计竞赛确定以学科群为特点形成组团式建筑群的规划理念.各参赛方案个性鲜明、风格显著,并为西区的进一步规划和实施提供了参考模式.     

基于Windows平台的PC集群并行计算技术

介绍一种基于Windows系统平台的、用于实现高性能计算的PC机群并行环境,详细描述了它的体系结构及其构建中的关键技术;并结合一个实际系统的应用实例简单说明了其构建方法和在其环境中进行并行程序设计的基本过程。     

煤矿井下掘进工作面作业人员生存质量调查信效度研究及影响因素分析

采用SF-36生存质量量表对城郊煤矿井下掘进工作面的273名作业人员进行问卷调查,并采用回归分析确定其主要影响因素。分析结果表明,重测信度系数均大于0.7,显示重测信度较好;分半信度系数为0.7290.7,说明内部一致性分半信度较好;因子累积贡献为81.476%50%,体现此次量表调查具有良好的结构效度;Logistic回归分析发现年龄和工种是影响掘进工作面作业人员生存质量的主要因素,钻眼工和人力推车工是生存质量状况最差的工种。SF-36量表在煤矿井下掘进工作面作业人员生存质量调查中,显示出良好的信效度。