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71.
为有效降低城市轨道交通系统的脆弱性,在脆弱性理论的基础上,界定城市轨道交通系统组元脆弱性的概念与内涵,并将其影响因素划分为人员、设备与环境3个指标组。整合DEMATEL、ANP与模糊VIKOR这3种系统分析评价方法,构建集成DEMATEL-ANP-FVIKOR方法的城市轨道交通系统组元脆弱性评价模型,并通过对北京地铁典型车站的评价来验证该评价模型的有效性。研究结果表明,该评价模型切实可行,能够对城市轨道交通系统组元脆弱性进行有效量化评价分析。 相似文献
72.
在酸性条件下,水样中的六价铬能够和显色剂二苯碳酰二肼反应生成紫红色络合物,该络合物溶液用自制的数字图像比色装置测定颜色值实现六价铬的现场快速检测.该方法在0.05 mg/L~1.00 mg/L范围内线性良好,方法检出限为0.02 mg/L,标准溶液10次测定结果的RSD为1.6% ~7.9%,实际水样加标回收率为94.... 相似文献
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Adaptations of the techniques of modern molecular biology to prenatal diagnosis has opened new avenues for the detection of genetic diseases. We have taken advantage of the rapid adhesion of colony forming cells in cultured amniotic fluid samples to develop an improved method for molecular diagnosis. By employing the cell adherence regime sickle cell diagnosis using Mst II can be undertaken directly. In addition, hybridization with a cloned repetitive sequence that is of Y origin and has limited autosomal homology permits rapid fetal sexing in 3 to 4 days without compromising conventional cytogenetic or biochemical analysis. This combination of techniques provides a useful adjunct to convential prenatal genetic diagnosis in the second trimester. 相似文献
76.
Abnormal pregnancy sonogram and chromosomal anomalies: Four years' experience with rapid karyotyping
Over a four-year period, 140 pregnancies with different malformations detected by ultrasound were examined cytogenetically. Gestational age ranged from 13 to 36 weeks. Twenty-six fetuses (18.6 per cent) had abnormal karyotypes, including trisomies, triploidy, monosomy X, and structural anomalies. Similar malformations were found in fetuses with different chromosomal anomalies, indicating that the types of malformations are not specific for particular chromosomal anomalies. Chromosomal analysis was performed on amniotic fluid culture and by direct karyotyping of placental biopsies. Direct karyotyping is suggested to be the most rapid approach, especially if sonographic anomalies are detected close to the 24th week of gestation, shortly before delivery, and in cases of significant oligohydramnios. 相似文献
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为解决当前企业应急管理体系建设滞后于社会治理的总体要求,缺乏法规标准支撑,尚未形成以法定责任和法定任务为指引的模式等问题,以北京市轨道交通工程建设为例,总结实践经验,以角色辨识、责任辨识和任务辨识为切入点,以预案、体制、机制、法制建设为核心,在企业层面提出一种应急管理体系建设模式和构建方法。研究结果可为同行业、同系统其他企业的应急管理体系顶层设计、具体构建和管理实践提供参考和借鉴。 相似文献
80.
Coral reefs are highly dynamic and productive marine ecosystems, providing habitat and refuge for an enormous number of species
including fish, invertebrates and algae. With increased anthropogenic pressures and global climate change, many coral reefs
are rapidly declining. Currently, there is limited knowledge on condition and community assemblage composition of shallow
fringing coral reefs along the south-eastern coast of Queensland, Australia. With increased demand to determine existence
of coastal fringing reefs by National Regional Management groups, a rapid cost effective method to determine reef composition
and condition was required. The aim of this study was to determine the benthic structure and extent of two small coastal fringing
reefs (Hummock Hill Reef and Stringers Reef) along the Southern Great Barrier Reef. Reef substrate assessments were carried
out using a rapid assessment technique and a Point Intercept Method (PIM). The data were analysed and classified using a Geographic
Information System (GIS). Percent substrate cover was calculated using a visual basic image analysis program. The Point intercept
method showed higher accuracy over the rapid assessment technique (up to 15–40% difference) and was thus deemed a more suitable
classification tool for reefs with high structural complexity and heterogeneity. This study focused on piloting a rapid, cost
effective Point Intercept Technique using random point count methodology to document coral benthic habitat and extent over
a commonly used rapid assessment method as a tool for reef coastal management and conservation. The two techniques were compared
and substrate classification success, limitations and errors were discussed. 相似文献