桩周土的损伤对桩基沉降的影响

在全深度——变深度的剪切弹簧模拟桩侧土对桩的约束的基础上,考虑桩周土的损伤对桩基沉降的影响,推导了一组确定桩的轴向荷载——沉降曲线的解析算式,经算例计算表明,考虑桩周土损伤来估计桩的承载力是合理的可行的。     

自动化监控系统在江阴船闸中的应用

介绍江阴船闸自动化系统的基本内容和主要功能。对控制管理模式、运行模式、系统结构进行分析，系统采用容错保护和故障自动检测报警，提高了船闸设备的智能化运行管理水平。     

宝成铁路增建第二线路基设计回顾

介绍宝成铁路增建二线,为避免路基施工干扰行车安全,设计所采取的工程措施,以及路基病害整治及配合施工的经验教训。     

TRB及其轧制应用关键技术

讨论了车身用连续变截面辊轧板(TRB)在轧制和应用过程中的关键技术。TRB技术的实质是传统纵轧与辊间距实时调整变化相协调的过程,TRB轧制的关键是建立板厚综合系统控制模型,TRB在车身上的应用需要解决相应的冲压模具设计及冲压成型性评价等技术。该研究为实现车身轻量化拓宽了思路。     

A Simple Analysis Method for Contact Deformation of Rolling Tire

A method is presented for the dynamic analysis of contact deformation for rolling tire on a road. The tire is modeled as an inextensible ring on elastic foundation with damping. Under known radial deflection, the ground contact region is predicted by solving simplified ring motion equation, treating ground contacting as a boundary condition. Furthermore, the effect of internal damping and rotating speed is analyzed on contact region.     

THE EXPRESSION OF P53 PROTEIN AND P21WAFl/cipl/sdil IN GASTRIC CARCINOMA

Ａｂｎｏｒｍａｌｉｔｉｅｓｏｆｔｈｅｐ5 3ｇｅｎｅｒｅｐｒｅｓｅｎｔｔｈｅｍｏｓｔｃｏｍｍｏｎｇｅｎｅｔｉｃａｌｔｅｒａｔｉｏｎｓｉｎｈｕｍａｎｃａｎｃｅｒ[1] .ｐ2 1ｐｒｏｔｅｉｎｈａｓｂｅｅｎｒｅｐｏｒｔｅｄｔｏｂｅａｃｒｉｔｉｃａｌｄｏｗｎｓｔｒｅａｍｅｆｆｅｃｔｏｒｏｆｐ5 3ａｎｄａｐｏｔｅｎｔｉｎｈｉｂｉｔｏｒｏｆｃｙｃｌｉｎ ｄｅｐｅｎ ｄｅｎｔｋｉｎａｓｅ[2 ] .ＡｓａｒｅｓｕｌｔｏｆＤＮＡｄａｍａｇｅ ,ｐ5 3ｉｎ ｄｕｃｅｓｔｈｅｅｘｐｒｅｓｓｉｏｎｏｆｉｔｓｄｏｗｎｓｔｒｅａｍｇｅｎｅ :…     

Experimental research on spray and combustion characteristics of the third generation conical spray

A new generation conical spray system for conventional diesel engines or premixed combustion diesel engines is introduced. By means of oriented impingement method, flexible spray penetration in design is realized. High-speed photograph was used to investigate the spatial distribution characteristics of the new spray for cases of different impingement angles and needle valve opening pressures. The results show that, by applying spray impingement orientation, fuel jets spread along the cone surface as shape of sectors, so the dispersion of jets is increased obviously. Changing on impingement angle leads to variation of penetration, which is critical in homogeneous mixture preparation. Due to the flexibility of spray penetration in design, the spray impingement on liner is avoided in a great extent. The results also indicate that higher needle valve opening pressure results in longer penetration and larger spray angle after impingement. Combustion characteristics of the impinged conical spray were studied in the 1135 type diesel engine. The new impinged conical spray system work smoothly in full load range with better fuel economy and lower emissions of NOx and soot than the original test engine.     

基于大数据的装配式小箱梁桥病害发展规律及原因分析

随着桥梁使用年限的增加,由于设计、施工、运营荷载、材料老化等方面的影响,绝大部分桥梁都出现了不同程度的劣化现象,桥梁养护形势日趋严峻。该文以装配式小箱梁桥为例,利用Ansys有限元程序、大数据以及现场检测等手段,分析桥梁病害的发展规律及病害产生的原因,得出结论:(1)现阶段,装配式小箱梁桥主要病害以腹板竖向裂缝为主,底板横向裂缝次之,且在各孔间分布差异较大,绝大多数分布于中间几孔,而靠近边孔的次边孔病害较为严重;(2)箱梁的开裂与采用的设计标准、计算跨径等因素相关;(3)重车(车辆荷载总重和轴载)的分布情况对箱梁开裂起到了决定性影响,箱梁开裂之后随着车辆荷载轴载次数的不断累积,裂缝数量呈现快速增长趋势。     

同心球壳-球体系感应磁场的解析解

考虑薄壳体和非薄壳体结构的感应磁场可提高舰艇感应磁场数值建模精度,开发相应的磁场数值程序包时,磁场解析解模型是验证程序包数值准确性的有效手段。同心球壳-球体系模型是验证同时考虑薄壳体和非薄壳体感应磁场数值准确性的理想模型。基于分离变量法推导了该模型感应磁场的解析解,以积分方程法和有限元法为参照,解析解误差均在5%以内,表明了导出解析解表达式的准确性。     

地铁工程中采用膨润土防水毯应注意的问题

针对南京地铁一号线和北京地铁五号线施工现场经常出现的问题进行了系统的归纳和总结,提出了影响膨润土防水毯防水效果的几个重要因素,对膨润土防水毯在地下工程中的正确应用具有一定的借鉴意义.