青藏铁路多年冻土区涵洞类型选择及基础埋置深度

青藏公路的运营状况表明，多年冻土区函洞病害多，结构破坏严重。根据青藏公路涵洞的使用状况，病害特点，结合青藏铁路的特点，提出适合多年冻土区的涵洞类型及其基础埋深。     

盘式制动器15次循环制动温度计算

本文针对盘式制动器，提出了15次循环制动的温升热力学模型，并利用有限差分法进行了实车计算，结果表明方法是可行的，可为制动器与整车的匹配设计提供参考。     

轿车柴油机

概述了轿车柴油机的发展历史和技术现状 ,介绍了国外典型产品的特点和技术参数以及轿车柴油机在国外的市场销售状况 ,预测了轿车柴油机的发展趋势 ,提出了我国发展轿车柴油机的策略建议     

BIOS优化设置、维护与升级

BIOS是计算机硬件和软件程序之间的接口，直接关系到计算机工作性能，文章介绍了BIOS的优化设置及BIOS的维护和升级操作方法。     

一种基于垂直字符边界特征的车牌定位方法

提出了一种基于垂直字符边界点特征的车牌定位方法，该方法能有效定位车牌，定位精度高达９８％，定位时间不超过２ｓ，并能有效地克服光线和天气条件等影响。     

汽车摩托车渐开线花键内齿拉刀倒角齿的计算

对汽车摩托车的渐开线内齿花键，为避免其磕碰、消除锐边、减少毛刺、便于装配及降低噪声等，常在其小径与齿侧的齿角处倒出Ｃ×４５°的的倒棱，其拉刀必须制出倒角刀齿。对磨削和检测拉刀倒角刀齿的传统工艺方法进行了分析。介绍了倒角齿齿形半角β和倒角刀齿侧面至拉刀中心的距离的计算。     

随机不平路面上的汽车强化试验研究

本文讨论了由载荷功率谱估算强化系数的方法,还研究了路面平整度、路面铺装和行驶车速等试验条件因素对汽车强化试验的影响,发现只有试验车速与实际使用常用车速接近,才能保证汽车构件上的载荷功率谱与实际使用相似。     

站内计轴设备的工程应用

根据Azs 350U型计轴设备的特点，结合工程设计，提出站内计轴设备设计的思路，供读者参考。     

Modeling heterogeneous risk-taking behavior in route choice: A stochastic dominance approach

This paper proposes a unified approach to modeling heterogonous risk-taking behavior in route choice based on the theory of stochastic dominance (SD). Specifically, the first-, second-, and third-order stochastic dominance (FSD, SSD, TSD) are respectively linked to insatiability, risk-aversion and ruin-aversion within the framework of utility maximization. The paths that may be selected by travelers of different risk-taking preferences can be obtained from the corresponding SD-admissible paths, which can be generated using general dynamic programming. This paper also analyzes the relationship between the SD-based approach and other route choice models that consider risk-taking behavior. These route choice models employ a variety of reliability indexes, which often make the problem of finding optimal paths intractable. We show that the optimal paths with respect to these reliability indexes often belong to one of the three SD-admissible path sets. This finding offers not only an interpretation of risk-taking behavior consistent with the SD theory for these route choice models, but also a unified and computationally viable solution approach through SD-admissible path sets, which are usually small and can be generated without having to enumerate all paths. A generic label-correcting algorithm is proposed to generate FSD-, SSD-, and TSD-admissible paths, and numerical experiments are conducted to test the algorithm and to verify the analytical results.     

THE EXPERIMENTAL STUDY ON THE CELL APOPTOSIS AND EXPRESSION OF BCL-2 PROTEIN IN INTRACEREBRAL HEMORRHAGE IN MODEL OF RATS

Intra-cerebral hemorrhage is a common clinicaldisease,with a high mortality and morbidity.So itis one of the clinical hot topics.It has been foundinrecent years that there is a close relationship bet weenthe cell apoptosis and the course or prognosis of in-tra-cerebral hemorrhage.Bcl-2,as the apoptosis-adjusted gene,plays ani mportant role in the courseof cell apoptosis,but the mechanis min the cell ap-optosis in intra-cerebral hemorrhage remains un-clear.In this experi ment,with the model bui…