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为保证危险货物铁路运输安全,基于铁路交通灾害预警管理理论,就危险货物铁路运输提出预警管理方法和建议。首先大量参阅危险货物铁路运输事故案例,结合安全系统工程理论,构建危险货物铁路运输预警系统指标体系。然后针对模糊综合评价权重难以确定的问题,为避免权重主观性过强,利用基于熵权模糊综合评价法对危险货物铁路运输安全进行评价。结合实例试算,结果表明:基于熵权模糊综合评价法的结果同原用评价法的结果基本一致。最后探讨铁路危险货物运输的定性预控措施。 相似文献
93.
Jørn Cruickshank 《Journal of Environmental Policy & Planning》2018,20(3):313-327
In the Lister region in the southern part of Norway, attempts are currently being made to facilitate for a green shift. The paper discusses two different approaches towards such a challenge. The first is procedural, where success or failure hinges on the methods applied in the effort to convince locals to incorporate climate considerations. The alternative is to reflect upon how a green ideology blends into pre-existing ideological elements in the region. It is claimed that an important reason for the failure so far to place the environment at the core of regional development, is that too much emphasis has been put on the first approach, on procedure and dialogue, whereas few efforts have been made to understand the structure of the discursive terrain in the region. What prevents a green shift has less to do with methods and is more connected to the dominance of a logic of economic growth and the fact that locals are confident that nature is already dealt with in a sensible manner. The conclusion is that we need to understand what people are concerned about and what prevents them to change, before we start telling them how to think and do development. 相似文献
94.
Hye Kyung Lee 《国际发展与全球生态学杂志》2018,25(4):371-381
As green infrastructure gets its attention in hazard mitigation, it is necessary to improve general understanding on what makes green infrastructure important for hazard and resiliency research. To better understand how green infrastructure fits with more traditional notions of structural and nonstructural mitigation, this study examines the relationship between green infrastructure and ‘structural and nonstructural’ mitigation approaches for hazard mitigation. Also, this study discusses a new measurement of locational aspects and spatial patterns of green infrastructure by utilizing high-resolution data in urban areas, and its potential implementation in hazard mitigation. Compared to previous research using land-use land-cover datasets, the normalized difference vegetation index (NDVI) utilizing National Agriculture Imagery Program dataset provides an ability to capture green infrastructure in greater detail. A visual comparison suggests that the NDVI data are able to capture and identify more types of ‘green’ land uses in Harris County. The total green infrastructure percentages for Harris County, Texas, based on 1-m high resolution were found to be 61.5% of the area, compared to the 51.5% based on the National Land Cover Database. This study provides support for utilizing high-resolution data to establish guidelines for green infrastructure’s spatial characteristics and sustainable hazard mitigation. The outcomes of this study will be helpful in the strategic planning and implementation of green infrastructure in urban areas with hazard issues. 相似文献
95.
为将空气幕作为城际铁路地下车站控烟措施提供理论依据,进而为地下车站防灾控烟设计提供新思路,以某典型城际铁路地下车站岛式站台层为依托,采用火灾动力学三维模拟软件FDS建立全尺寸火灾模型,对比单吹式、吹吸式空气幕布置于站台与轨行区间时楼梯及站台处温度及可见度分布规律,并分别对单吹式、吹吸式空气幕的射流风速、射流角度进行了参数优化研究。结果表明:单吹式、吹吸式空气幕均可保证火灾下楼梯区域可见度和温度的安全性要求;单吹式在射流风速为12 m/s且射流角度为10°时,吹吸式在射流风速为8 m/s时,防烟效果良好且趋于稳定;采用单吹式的最小站台危险区域较吹吸式长15 m,建议在城际铁路地下车站中选用吹吸式空气幕。 相似文献
96.
Young-Joon Surh 《Environmental Chemistry Letters》2006,4(3):137-141
There are multiple lines of compelling evidence, mostly from population-based studies, supporting that green tea consumption is associated with reduced risk of several human malignancies. Epigallocatechin gallate (EGCG) is a major antioxidant present in green tea. Chemopreventive effects of EGCG have been extensively investigated and well documented. These include inhibition of metabolic activation of carcinogens and/or stimulation of their detoxification, scavenging of reactive oxygen species, induction of apoptosis or differentiation of malignant or transformed cells, suppression of tumor promotion, inhibition of angiogenesis or metastasis, etc. EGCG targets many intracellular signaling molecules and events responsible for malignant transformation or abnormal cell proliferation, and NF-κB and AP-1 appear to be two of most potential targets of EGCG in its exerting chemopreventive activities. 相似文献
97.
碘酸钾氧化甲基绿褪色光度法测定痕量锡 总被引:3,自引:0,他引:3
研究了稀磷酸介质中痕量锡催化碘酸钾氧气甲基绿的褪色反应及动力学条件,建立了高灵敏度测定痕量锡的新催化光度法.方法的灵敏度为2.4×10-12g/mL,线性范围为0~0.12μg/L.用于人发、水样及矿石中痕量锡的测定,结果满意. 相似文献
98.
“W型低NOx环保燃烧器”采用先进的复合多级混合式雾化技术,强化喷射、混合和扩散,燃烧充分从而控制NOx生成。 相似文献
99.
赣闽浙三省接合区砂金资源分布广泛,尤以赣东北乐安江、昌江水系最富。本文是在对该区野外调查,取样分析和典型砂金矿床、矿点地质环境分析的基础上,认为冲积型砂金富集与矿源层分布,水系发育规模及地貌条件,含金物质搬运距离,水动力条件,沉积界面微地貌及合金物质沉积后埋藏状况有密切关系,掌握砂金沉积学特点有利于资源的勘探和开发。 相似文献
100.