排序方式: 共有53条查询结果,搜索用时 15 毫秒
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海事部门作为政府搜救指挥部办公室单位,在搜救工作中责任重大,应不断完善和理顺辖区搜救和指挥体系,组织指挥好海上搜救工作。 相似文献
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沥青混合料中沥青的用量对沥青混合料使用性能有重要的影响。文章引用了大量数据对5种沥青用量确定方法进行了比较,并提出了较合理的最佳沥青用量确定方法。 相似文献
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介绍了砂带磨削的特点及优越性,着重阐述了应用砂带磨削技术解决活塞销倒角工艺难题的过程及所取得的成果和经验,并对砂带磨削技术在汽车制造中进一步发展及其应用前景提出了设想。 相似文献
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In this paper, field measurements and pullout tests of a new type of reinforced earth retaining wall, which is reinforced by trapezoid concrete blocks connected by steel bar, are described. Field measurements included settlements of the earth fill, tensile forces in the ties and earth pressures on the facing panels during the construction and at completion. Based on the measurements, the following statements can be made : ( 1 ) the tensile forces in the ties increased with the height of backfill above the tie and there is a tensile force crest in most ties; (2) at completion, the measured earth pressures along the wall face were between the values of the active earth pressures and the pressures at rest; (3) larger settlements occurred near the face of the wall where a zone of drainage sand and gravel was not compacted properly and smaller settlements occurred in the well-compacted backfill. The results of field pullout tests indicated that the magnitudes of pullout resistances as well as tensile forces induced in the ties were strongly influenced by the relative displacements between the ties and the backfill, and pullout resistances increased with the height of backfill above the ties and the length of ties. 相似文献
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基于人工神经网络的沥青混合料体积性质预测 总被引:1,自引:1,他引:1
在变级配多组试验数据的基础上,建立了人工神经网络预测模型。以各筛孔通过率作为输入,矿料间隙率和粗骨架间隙率作为输出,得到的神经网络预测模型,对于某种具体的材料,能够预测其它各种不同的级配在相同的沥青用量下所具的体积性质。 相似文献
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为了确定停车诱导系统实施是否达到预期目标和功能要求,需对系统进行整体评价,以确定系统达到了预计的哪种实施效果层次。分析并归纳了城市停车诱导系统的评价指标,将多级模糊模式识别方法引入到对停车诱导系统的评价中来,详细介绍了该方法的基本原理,并通过实例说明了方法应用的具体步骤。结果表明,运用该方法可对停车诱导系统设计与实施效果优劣较好地作出评判。 相似文献
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边坡土钉支护自90年代以来在我国有着越来越广泛的运用。它施工简单,不占工期,工程量较小、造价低。但关于土钉的受力机理、工作特点的讨论并不太清楚,如钉杆周围剪力的分布规律、土钉轴力的变化特点、土钉最大轴力的中性点位置等等。本文对此做了详细的论述,以有利于土钉支护的理论发展和工程应用。 相似文献