高速公路双连拱隧道施工监控量测及分析

在宜(宾)水(富)高速公路鞋底坡双连拱隧道工程中,由于对隧道围岩变形及地表沉降进行了现场监测与分析研究,获得了隧道各施工阶段的地表沉降、拱顶下沉和周边收敛数据资料,有效地控制了隧道围岩变形,成功地对隧道洞口段的地质灾害进行了动态预测、预报,避免了重大事故的进一步发展。文章介绍了鞋底坡双连拱隧道的监控量测方案、测量结果分析及研究成果,对类似工程具有一定的指导意义和实际应用价值。     

解放CA10型载货汽车前轮摆振的数值仿真研究

以解放CA10型载货汽车为研究对象，建立了转向系统的3自由度数学模型，分别研究了轮胎特性参数、转向系统参数、悬架参数等对摆振的影响。     

润扬长江公路大桥南汊悬索桥缆索系统设计

润扬长江公路大桥是世纪之交我国自行设计、自行建造、自行管理的一座特大型桥梁。该大桥已于2000年10月正式开工建设，目前正在施工中。该桥南汊悬索桥为世界第三、中国第一的特大跨度悬索桥，现主要介绍其缆索系统设计情况。     

GENETIC POLYMORPHISM OF SIX Y CHROMOSOMAL STR IN CHINESE HUI ETHNIC GROUP

Objective To study genetic polymorphism of 6 Y chromosomal STR in Hui ethnic group living in Ningxia Hui ethnic autonomous region, in order to evaluate their usefulness in forensic science and enrich the Chinese genetic information resources. Methods We investigated 101 unrelated, healthy, male individuals of Hui ethnic group and studied their allelic frequency distribution and haplotype diversity of 6 Y chromosomal STR. Primer for each loci was labeled with the fluorescent by FAM (blue) or TAMRA(yellow). The data of Hui ethnic group were generated coamplification, GeneScan, genotype, and genetic distribution analysis. Results 31 alleles and 43 phenotype(DYS385) were detected, with the frequencies ranging from 0. 0099- 0. 7129. Out of a total of 101 individuals, 96 showed different haplotypes; 91 were unique; 5 were found 2 times. The haplotype diversity for 6 Y-STR loci was 0. 9990. Conclusion The date obtained can be valuable for individual identification, paternity testing in forensic fields and for population genetics because of 6 Y-STR loci high polymorphism.     

硅粉混凝土的耐久性

通过向混凝土中掺加硅粉并对掺加硅粉的混凝土进行一系列性能分析,提出硅粉是提高混凝土早期强度和耐久性的重要掺和料,也是制作高抗冻融高强混凝土的主要途径。     

NUMERICAL ANALYSIS OF STRIKE OF PISTON TO CYLINDER UNDER SUPERCHARGE CONDITIONS

Objective To investigate the changes to the strike extent of piston to cylinder after engine supercharge design. Methods The lubrication model between the skirt of piston and liner is established by means of piston dynamics, combined with the hydrodynamic lubrication equation. Optimized numerical analysis method is employed in solving the dynamics and lubrication equations. The analyses about piston strike under two combustion gas pressures are performed. Results The peak values of maximum eccentricity under supercharge condition are much greater than under non-supercharge condition, which means a stronger impulsion of piston to cylinder wall and a greater possibility of scuffing. The horizontal velocities of piston in supercharge condition are larger, which illuminate the more unstable motion state. Conclusion The analysis gives a new conclusion. Combustion gas pressure plays an important role in the piston strike motion. Influences of supercharge should be taken into account so that the traditional product test items can be improved.     

浅谈贫混凝土基层的性能和配合比设计

贫混凝土基层是一种优良的基层类型，其主要优点是抗冲刷性好、强度高、抗冻性好、板体性强、承载能力大，被广泛应用于高等级公路的基层。该结合近几年国内外研究成果，对贫混凝土基层的性能特点和配合比设计进行了探讨。     

电力牵引列车运行的计算机模拟

电力牵引列车运行计算机模拟系统是模拟一组电力牵引列车在给定线路下的运行情况，进而研究列车在运动时的速度、电流和电压变化情况以及对动力网络的需求与作用，现介绍该模拟软件包的主体结构、模拟模型与控制策略，如线路拓扑结构，列车运行模型、ＡＴＰ和ＡＴＯ控制策略以及电力网模型。     

浅谈计算机在公交行业中的应用

公交行业将面临越来越多的新问题 ,阐述了计算机在公交管理中的应用 ,以达到新开辟的线路和新调整的线网更为科学的目的。