“山竹”台风对广州市滨江园林树木的 影响——以临江大道及带状公园为例

临江大道及其带状公园是广州市沿江道路绿化和滨江绿地，是该城市园林景观的重要组成部分。由于2018年第22号“山竹”台风的影响，临江大道园林树木受损严重。基于临江大道行道树安全检测评估，综合“山竹”台风灾后临江大道及带状公园的树木受损情况进行了分析，结果发现不同的树种其抗风性差异较大；对6种重要的不同树种倒伏进行Logistic回归分析，发现相关的种树之间的倒伏差异极显著。从树木安全评估角度去探讨滨江园林树木受损、树种选择与种植情况，为华南地区城市滨江园林树木养护和修复提供参考和借鉴。     

燃气输配管网可靠性的故障树分析

对引起管网失效的各个因素进行系统分析，建立了燃气输配管网失效故障树，对该故障树进行了定性和定量分析。     

埋地燃气管道的风险评估技术

阐述了我国进行燃气管道风险评估面临的挑战。用改进的故障树法建立埋地燃气管道阴极保护的风险评估模型，将风险评估模型的结果与现场实测、开挖结果相比较，二者基本一致。该风险评估模型为管道的安全运行及防腐系统的修复工作提供了科学依据。     

集中空调系统的可靠性分析

运用系统可靠性理论,结合集中空调系统的功能特点,建立了可靠性数学模型。在空调系统各组成单元故障模式分析的基础上,分别建立了集中空调系统和制冷系统的故障树。采用最小割集分析法确定了导致制冷系统失效的主要因素,提出了改善集中空调系统可靠性的途径。     

旧有建筑安全隐患及故障树分析方法

旧有建筑在许多方面存在安全隐患,运用定性和定量的方法分析旧有建筑安全隐患是城市防灾的重要课题之一。故障树分析方法在许多工业领域的成功运用,为它用于旧有建筑安全事故隐患分析提供了可能性。运用该方法分析了旧有建筑火灾隐患,并对旧有建筑安全评价的发展方向做出预测。     

速生杨木LVL材料性能试验研究

对速生杨木制作的单板层积材(Laminated Veneer Lumber,简称LVL)的各项材料性能指标进行测试,将测试验值按《木结构设计规范》确定设计值方法换算,结果表明杨木LVL可作结构材使用.     

大体积混凝土配合比的正交试验研究

本文针对某大体积混凝土工程的温升控制问题，在原材料选择、配合比优化方面进行两次正交试验：首先通过不同水泥品种、缓凝剂用量、粉煤灰掺量多种组合选择水化热低的胶凝物质方案；然后通过“性价比”、泵送性、配制强度三项指标确定最优配合比。     

精细化尺度下的城市绿地建设公众 参与途径——以柏林、伦敦“植树计划” 为例

绿地空间具有减缓城市热岛效应、调节微气候、减轻噪声、改善城市居民身心健康、增加生物多样性等诸多优点。城市绿地建设是城市可持续发展的基础,不能仅依靠“自上而下”的上层规划来进行,同时应关注社会公平性、经济效益、市民意愿等因素,从精细化尺度贯彻公众参与制度,真正实现市民共建的“人民城市”。对公众参与政策的起源与发展情况进行简要介绍,并探讨在城市绿地建设中不同阶段的公众参与方式。以柏林、伦敦的“植树计划”政策为例,从资金来源、公众参与方式、参与形式、参与层次、计划成效几方面,比较分析2个城市植树计划的公众参与模式与深度及优点与不足,以对中国绿地建设提供借鉴。最后,针对我国公众参与绿地建设存在的问题,提出精细化构建制度法规保障体系、精细化资金来源途径,以及搭建精细化参与渠道三方面的启示与建议。     

Remediation of groundwater contaminated with MTBE and benzene: the potential of vertical-flow soil filter systems

Field investigations on the treatment of MTBE and benzene from contaminated groundwater in pilot or full-scale constructed wetlands are lacking hugely. The aim of this study was to develop a biological treatment technology that can be operated in an economic, reliable and robust mode over a long period of time. Two pilot-scale vertical-flow soil filter eco-technologies, a roughing filter (RF) and a polishing filter (PF) with plants (willows), were operated independently in a single-stage configuration and coupled together in a multi-stage (RF + PF) configuration to investigate the MTBE and benzene removal performances. Both filters were loaded with groundwater from a refinery site contaminated with MTBE and benzene as the main contaminants, with a mean concentration of 2970 ± 816 and 13,966 ± 1998 μg L⁻¹, respectively. Four different hydraulic loading rates (HLRs) with a stepwise increment of 60, 120, 240 and 480 L m⁻² d⁻¹ were applied over a period of 388 days in the single-stage operation. At the highest HLR of 480 L m⁻² d⁻¹, the mean concentrations of MTBE and benzene were found to be 550 ± 133 and 65 ± 123 μg L⁻¹ in the effluent of the RF. In the effluent of the PF system, respective mean MTBE and benzene concentrations of 49 ± 77 and 0.5 ± 0.2 μg L⁻¹ were obtained, which were well below the relevant MTBE and benzene limit values of 200 and 1 μg L⁻¹ for drinking water quality. But a dynamic fluctuation in the effluent MTBE concentration showed a lack of stability in regards to the increase in the measured values by nearly 10%, which were higher than the limit value. Therefore, both (RF + PF) filters were combined in a multi-stage configuration and the combined system proved to be more stable and effective with a highly efficient reduction of the MTBE and benzene concentrations in the effluent. Nearly 70% of MTBE and 98% of benzene were eliminated from the influent groundwater by the first vertical filter (RF) and the remaining amount was almost completely diminished (∼100% reduction) after passing through the second filter (PF), with a mean MTBE and benzene concentration of 5 ± 10 and 0.6 ± 0.2 μg L⁻¹ in the final effluent. The emission rate of volatile organic compounds mass into the air from the systems was less than 1% of the inflow mass loading rate. The results obtained in this study not only demonstrate the feasibility of vertical-flow soil filter systems for treating groundwater contaminated with MTBE and benzene, but can also be considered a major step forward towards their application under full-scale conditions for commercial purposes in the oil and gas industries.     

仓储某型云爆弹失效分析与实验研究

云爆弹是新一代轻型系列武器中的面毁伤武器,采用失效树分析方法,确定了仓储某型云爆弹的失效模式,研究了主要失效因素,并通过试验验证了硝酸异丙酯对推进剂的安定性能和燃烧性能以及对电火工品的影响。发现硝酸异丙酯渗漏后会降低推进剂的储存安定性,影响推进剂的燃烧规律并会溶解溶胀电火工品,导致其失封。