Trams-a risk factor for pedestrians

In Gothenburg tram injuries were identified to be an important cause of traffic injuries and fatalities (48%) among pedestrians. During the summer middle-aged men, often under the influence of alcohol, were often severely injured and the injury rate was also high during the autumn. A majority (60%) of those fatally injured were under the influence of alcohol. Most injury events happened at or near a tram stop. The most serious injuries arose when the victim landed under a tram. In 1992, a runaway tram caused a major disaster, killing 10 pedestrians and injuring 30. The injury reducing measures the tram company has now started to introduce include safety railings at tram stops, side barriers on the tramcars to prevent people from falling under the tram and lower speeds near tram stops.     

EFFECT OF HYDROGEN ON THE MICROSTRUCTURE OF SUPER-α2 ALLOY WITH β SOLUTION AND AGEING TREATMENT

借助透射电镜和Ｘ射线衍射仪探讨了氢对Ｓｕｐｅｒ－α２合金β固溶后时效组织的影响，结果表明，氢使时效组织显著细化，使析出相呈细小板条状规则排布，此外，氢还促进Ｂ２相转变为Ｏ相。     

Sensitivity analysis of free torsional vibration frequencies of thin-walled i-beam resting on elastic foundation

The sensitivity analysis of natural frequencies of torsional vibration of thin-walled I-beams resting on a Winkler-type elastic foundation and subjected to axial static loads is discussed. The first-order variation of the frequencies due to the design variable variations is derived. The cross- ection dimensions, the beam material constants and the foundation stiffness are assumed to be the design variables. The considerations are based on the theory of thin-walled beams with nondeformable cross-section. The underintegral sensitivity coefficients of the flange width and the foundation stiffness variations for a simply supported I-beam are determined. An accuracy of approximation of the natural frequencies changes due to the design variable change, by means of their first-order variations, is also investigated.     

高压注水在综放工作面的应用

介绍了综采煤层注水软化工艺的原理 ,钻孔布置方法以及生产实际中的应用情况     

采用激光光刀的叶片三维面形测量方法

提出一种采用激光光刀的叶片三维面形测量方法。介绍了方法原理、系统结构、信息获取与处理方案,并给出了对实际飞机发动机叶片的面形测量结果。     

Al的添加对Gd-Co合金的影响

用X射线衍射、扫描电镜和磁性测量等方法研究了Al的添加对Gd-Co合金的影响。研究结果表明：在一定范围内掺杂Al导致GdCo2、GdCo5和Gd2Co17晶格常数增大，但仍保持各自的晶体结构；Al的添加使GdCo2和Gd2Co17的居里温度降低，但是对于GdCo2却是先增后减。该结论为寻找新的磁性材料提供了有价值的参考。     

靖边气田含醇污水处理工艺优化

随着陕北靖边气田的不断开发，气井产水量逐年增加，在对气井加注甲醇过程中，气田含醇污水量增大、含醇浓度偏离设计值，同时气田污水具有很强的结垢、腐蚀倾向，影响了甲醇回收装置的稳定运行。为此,从优化含醇污水处理工艺的角度出发，通过采取对高产水井污水分排分储、预处理工艺及操作参数优化、甲醇回收装置参数优化运行试验等措施，减少了含醇污水产量，改善了预处理效果，提高了甲醇回收装置运行效率和产品甲醇质量，保证了目前的含醇污水处理能够满足气田发展的需要。     

Si衬底上横向外延GaN材料的微结构和光学性质的研究

用氢化物气相外延 (HVPE)方法在Si(III)衬底上成功横向外延生长出晶体质量较好的GaN薄膜材料。透射电子显微镜 (TEM )的研究结果表明 ,横向外延区域GaN的位错密度明显减小。由于SiO2 掩膜腐蚀角的不同 (分别为 90°和 6 6°) ,导致了横向外延GaN材料一些独特的微观形貌。微区拉曼光谱由数百条拉曼散射曲线组成 ,每一条曲线有三个振动模 ,分别对应Si振动模式 (5 2 0cm- 1) ,E2 模式 (5 6 6cm- 1)和E1(LO)模式(732cm- 1)。在垂直条纹方向 ,峰位和峰宽没有明显的变化 ,而峰强约 5 μm会发生周期性变化     

塔河油田特殊钻井条件下的录井技术

该文阐述了定向井、水平井和欠平衡钻井技术对传统录井方法的影响:钻时偏大、失真,岩屑细、代表性差,荧光常达12级、无意义,全烃值一般在5%以上,难以有效划分油气层;指出在特殊钻井条件下掌握设计指导思想,卡准重要层位是录井工作的关键,重点要参考组分分析数据、定量荧光分析数据和综合录井其它信息才能准确识别油气层。