排序方式: 共有108条查询结果,搜索用时 15 毫秒
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结合江东路部分节点改造工程,针对EPS轻质路堤断面设计形式及其防护措施,通过分析传统方法的不足,提出了轻型EPS联合轻型U槽的横断面设计形式。实践证明,该方案可以从根本上解决附加荷载大的问题.同时减少差异沉降,防止横向裂缝等,值得推广。 相似文献
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Andrea Riedel Christine Michel Michel Gosselin Bernard LeBlanc 《Journal of Marine Systems》2008,74(3-4):918
An understanding of microbial interactions in first-year sea ice on Arctic shelves is essential for identifying potential responses of the Arctic Ocean carbon cycle to changing sea-ice conditions. This study assessed dissolved and particulate organic carbon (DOC, POC), exopolymeric substances (EPS), chlorophyll a, bacteria and protists, in a seasonal (24 February to 20 June 2004) investigation of first-year sea ice and associated surface waters on the Mackenzie Shelf. The dynamics of and relationships between different sea-ice carbon pools were investigated for the periods prior to, during and following the sea-ice-algal bloom, under high and low snow cover. A predominantly heterotrophic sea-ice community was observed prior to the ice-algal bloom under high snow cover only. However, the heterotrophic community persisted throughout the study with bacteria accounting for, on average, 44% of the non-diatom particulate carbon biomass overall the study period. There was an extensive accumulation of sea-ice organic carbon following the onset of the ice-algal bloom, with diatoms driving seasonal and spatial trends in particulate sea-ice biomass. DOC and EPS were also significant sea-ice carbon contributors such that sea-ice DOC concentrations were higher than, or equivalent to, sea-ice-algal carbon concentrations prior to and following the algal bloom, respectively. Sea-ice-algal carbon, DOC and EPS-carbon concentrations were significantly interrelated under high and low snow cover during the algal bloom (r values ≥ 0.74, p < 0.01). These relationships suggest that algae are primarily responsible for the large pools of DOC and EPS-carbon and that similar stressors and/or processes could be involved in regulating their release. This study demonstrates that DOC can play a major role in organic carbon cycling on Arctic shelves. 相似文献
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高填方涵洞结构设计新方法 总被引:1,自引:0,他引:1
以某高速公路高填方涵洞应用减荷措施为例,对采取减荷措施情况下的涵洞进行新的结构设计,并与原有涵洞进行对比,以此证明按采取减荷措施进行涵洞设计的实际意义与经济价值。 相似文献
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高速公路长隧道机电系统一旦瘫痪无法工作,便存在严重的交通安全隐患,EPS应急电源的性能特点使其可以很好地预防这类因电力而导致的一系列事故.基于对EPST作原理的简要介绍,并将其与柴油发电机组和UPS进行对比分析,结果表明,EPS以其特有的优势具有广阔的应用空间. 相似文献
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构建了基于Matlab/Simulink的EPS系统模型、H.B.Pacejka轮胎模型以及三自由度整车模型,进而应用系统集成的方法构建了集成仿真模型,在此基础上分析了EPS系统对方向盘瞬态响应品质的影响并验证了助力控制策略。结果表明集成仿真模型具有较好的动态模拟特性,EPS具有较好的稳定性且控制策略能够较好的协调转向轻便性与路感的矛盾。 相似文献
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简述电动助力转向系统的发展历史和优点,详细分析昌河北斗星CH7100A轿车电动助力转向系统的组成和工作原理,介绍电动助力转向系统的检修方法。 相似文献
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含EPS夹层台背回填材料的离心模型试验 总被引:12,自引:2,他引:12
通过离心模型试验,研究了EPS(Expanded Polystyrene)夹层以及“夹层 格栅”结构对台背土压力和差异沉降的影响。根据等应变原则对台背结构、地基、回填材料、格栅和夹层材料进行模拟,采用n为20的模型比尺进行离心模型试验;并运用数字图像技术分析了土工格栅的位移与变形。研究发现设置夹层后回填材料对台背的土压力显著减小;台背与回填材料的差异沉降有所增加。“夹层 格栅”结构进一步减小了回填材料对台背的土压力,桥台与回填材料的差异沉降也比较小,格栅所受的拉应力明显变大。结果表明夹层的存在非常有利于格栅加筋效果的发挥.“夹层 格栅”的处理方法更加适用于三背回填的实际工程。 相似文献
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