高炉出铁场除尘方案研究

某钢铁企业高炉炼铁车间的出铁场在生产过程中产生大量高浓度的烟尘,对厂区的大气环境及周边的环境造成严重污染,同时直接危害了职工的身体健康。通过对整个出铁场除尘工艺系统及通风状况的分析及实际应用情况,总结出了适合该场合的系统除尘方案。     

Creating False Images: Stream Restoration in an Urban Setting

Stream restoration has become a multibillion dollar business with mixed results as to its efficacy. This case study utilizes pre‐ and post‐monitoring data from restoration projects on an urban stream to assess how well stream conditions, publicly stated project goals, and project implementation align. Our research confirms previous studies showing little communication among academic researchers and restoration practitioners as well as provides further evidence that restoration efforts tend to focus on small‐scale, specific sites without considering broader land use patterns. This study advances our understanding of restoration by documenting that although improving ecological conditions is a stated goal for restoration projects, the implemented measures are not always focused on those issues that are the most ecologically salient. What these projects have accomplished is to protect the built environment and promote positive public perception. We argue that these disconnects among publicized goals for restoration, the implemented features, and actual stream conditions may create a false image of what an ecologically stable stream looks like and therefore perpetuate a false sense of optimism about the feasibility of restoring urban streams.     

多层频率选择表面复合吸波结构的研究

文中采用一种快速求解方法——半解析半数值法计算多层频率选择表面(Frequency Selective Surface,简称FSS)复合结构的反射系数,然后结合具体两层复合结构的实例通过测试验证了半解析半数值法的正确性,并基于复合结构吸波材料吸波频带窄的缺点,在此基础上,设计出一种新的圆形FSS复合结构吸波材料。计算和测试结果都表明,这种新的复合结构在较宽带宽内具有低反射系数。     

攀枝花市城市基础设施与土地收益关联度分析

以攀枝花市为例,综合运用GIS空间分析技术和变异系数权重分析、灰色关联度等方法建立了城市基础设施与土地收益的关联度模型,定量分析城市基础设施与土地收益的关联关系,揭示两者间的关联规律和作用机理.结果表明：①城市基础与土地收益存在较大关联性;②城市基础设施与土地收益关联度在时间序列上具有明显的波动性且呈周期性变化;③城市基础设施与土地收益关联度在空间上呈分异特征.     

捕集阱顶空-气相色谱/质谱法检测地表水中25种挥发性有机物

建立了捕集阱顶空-气相色谱/质谱法检测地表水中25种挥发性有机物的分析方法。采用正交实验设计对捕集阱顶空条件进行了优化,该方法相关系数0.995,加标回收率为90%~110%,方法检出限为0.08~0.39μg/L,相对标准偏差(n=7)为0.7%~4.8%,仪器检出限低于0.04μg/L。方法准确度和灵敏度较好,可以满足对地表水中25种挥发性有机物的检测要求。     

城市轨道交通上盖物业振动影响评价标准选取探讨

对现行的振动评价标准中相关问题进行分析,认为VLzmax和VLz10分别作为城市轨道交通列车振动和环境振动背景评价量是合理的。并对标准JGJ/T 170-2009应用提出了建议。     

汶川地震映秀镇地质条件与地表破裂特征调查

2008年5月12日14时28分04秒,四川省汶川县发生了MS 8.0地震.根据地震部门测定,本次地震是从映秀开始破裂,震中位于四川汶川县映秀镇附近(北纬31.015°,东经103.365°).在中国地震局组织的汶川地震科学考察成果基础上,本文分析了映秀地质条件:主要发育的地层为二叠系的石英闪长岩,震旦系的砂岩;通过研究区的主要构造为龙门山中央断裂-映秀-北川断裂;主要的地貌类型为河流地貌.调查了研究区的地表破裂特征,根据研究区的地貌类型将其划分为A、B、C三段,A段为河床沉积地貌,垂直断距最大;B段为丘陵地貌,断距中等,但诱发崩塌地质灾害;C段为河流边滩地貌,断距较小,但震害严重.     

Motivations for Conserving Urban Biodiversity

Abstract: In a time of increasing urbanization, the fundamental value of conserving urban biodiversity remains controversial. How much of a fixed budget should be spent on conservation in urban versus nonurban landscapes? The answer should depend on the goals that drive our conservation actions, yet proponents of urban conservation often fail to specify the motivation for protecting urban biodiversity. This is an important shortcoming on several fronts, including a missed opportunity to make a stronger appeal to those who believe conservation biology should focus exclusively on more natural, wilder landscapes. We argue that urban areas do offer an important venue for conservation biology, but that we must become better at choosing and articulating our goals. We explored seven possible motivations for urban biodiversity conservation: preserving local biodiversity, creating stepping stones to nonurban habitat, understanding and facilitating responses to environmental change, conducting environmental education, providing ecosystem services, fulfilling ethical responsibilities, and improving human well‐being. To attain all these goals, challenges must be faced that are common to the urban environment, such as localized pollution, disruption of ecosystem structure, and limited availability of land. There are, however, also challenges specific only to particular goals, meaning that different goals will require different approaches and actions. This highlights the importance of specifying the motivations behind urban biodiversity conservation. If the goals are unknown, progress cannot be assessed.     

城中村雨水污水完善改造方案浅析

结合深圳盐田区城中村污水完善改造设计及施工服务中所遇到的问题,提出为彻底解除雨水污水混流现象而采取的措施和方法,以作为今后城中村雨水污水分流制改造过程中的借鉴或参考。     

铁合金电炉烟尘的性质与低温固结研究

本文研究了硅铁电炉布袋除尘收集的烟尘性能，烟尘低温固结球团的性能和工艺方法。研究结果表明，硅铁电炉烟尘中ＳｉＯ２ 约占９０ － ９５ ％ ，其它组分含量较低，有利于进行回收利用。烟尘密度小、粒度细、表面活性差、成球性能差。采用添加粘结剂进行自然养护和低温固结处理，均能获得强度较好的固结球团，能够加入铁合金炉回收利用。