青藏铁路格拉段防雷接地技术的研究

青藏铁路格拉段是世界上海拔最高的高原铁路，雷击过电压保护面临高原和冻土两大难题。针对雷击过电压的影响因素，在分析格拉段雷暴活动情况及沿线高原冻土地区地质特点的基础上，提出铁路沿线防雷接地工程的实施办法。结合高原冻土地区的特点，探讨了格拉段防雷接地技术的新思路和急需解决的问题。     

关于开展船舶工程专业大学生科研实践活动的几点体会

从本单位近几年来所开展的大学生科研实践活动中,逐步总结摸索出了一条本科教学与创新型科研实践活动相结合的多赢之路。文中有关进行该类活动的方式方法及个案处理思路,对同行和今后本科教学工作,都具有一定的借鉴和指导作用。     

A dynamic analysis of person and household activity and travel patterns using data from the first two waves in the Puget Sound Transportation Panel

Daily activity participation and travel patterns are examined using data from the Puget Sound Transportation Panel (PSTP), which contains two-pairs of daily travel diary information (wave 1 in 1989 and wave 2 in 1990). Summary data of the travel diaries at the person and household levels are obtained using cluster analysis. At the person level, four clusters are found reasonable for both activity and travel. The four-cluster solutions indicate substantial day-to-day variation in activity participation and similarity in travel behavior over time. Temporal changes are analyzed using contingency table methods and log-linear models. The analysis reveals that activity participation and mobility present many regularities over time. Transitions within each wave show strong dependence between two days for both activity and travel, with higher dependency for the travel patterns than for the activity patterns. These are consistent when the analysis focuses on a longer period such as a year. Temporal dependencies appear to be stronger in the household-based than the person-based analysis. A hierarchical structure is also found in the relationship between activity and travel clusters. The link between activity and travel is much stronger within a day, weaker from one day to another, and the least strong from one year to the next. Important irregularities, however, are found and may be due to scheduling time-frames adopted by the respondents that are only partially captured in the data used.     

多金属氧酸盐及其衍生物对废水中对硝基苯酚催化降解的研究

合成了HKUST和MIL-101四种化合物,对其比表面积进行了表征,然后利用对硝基苯酚的还原反应评价了PWCuBTC,PMoCuBTC它们的催化性能.结果表明,PWCuBTC具有最好的催化效果,循环使用13次后,该催化剂仍能在6 min之内完全降解对硝基苯酚溶液.由此可见,POMOF在降解对硝基苯酚这样的有机污染物方面有潜在的应用前景.     

一种新型重型越野汽车的可活动上车踏板结构设计

重型越野汽车通常需要将第一阶上车踏板设计成活动的。由于重型越野汽车的使用环境非常复杂,因此活动上车踏板需要性能可靠耐用。本文所描述了这样一种新结构上车踏板。     

品系、性别和生物节律对小鼠旷场实验的影响

目的探讨性别、品系以及昼夜生物节律对旷场实验的影响。方法利用旷场实验检测不同性别的C57BL/6、BALB/c、昆明小鼠在白天与夜间对新环境的探索行为与自发活动能力。结果 3种品系小鼠旷场实验结果显示:C57BL/6在旷场中探索活动和自发活动量最低,显著低于BALB/c和昆明小鼠;C57BL/6雌、雄小鼠在白天和夜晚探索活动和自发活动量未见差异,而BALB/c和昆明小鼠分别在白天和夜间呈现性别差异;C57BL/6雌雄小鼠昼夜探索活动和自发活动量差异均无统计学意义,而BALB/c和昆明雌性小鼠呈现夜间高于白天,雄性小鼠则无此表现。结论 C57BL/6小鼠在新环境中探索活动少,自发活动量低,且受性别、节律因素影响较小,适合用于神经行为学和焦虑相关行为研究。     

基于UML2.0活动图的车载设备测试用例生成方法研究

重点研究基于UML2.0活动图的CTCS-2级车载设备测试用例生成方法.介绍车载设备的构成和功能,对活动图进行形式化定义,阐述测试用例的设计,包括车载设备活动图建模规则、测试用例的形式化定义、测试覆盖准则的定义、基于深度优先搜索并且带回溯的遍历算法的测试场景生成,以及测试用例的生成算法,最后实现了测试用例生成.     

增强高职高专学生党支部组织生活实效性

高职高专学生党支部的组织生活是学生党建工作的重要内容,是党组织对党员进行教育、管理、监督的重要形式,也是保持党员先进性的一项重要措施.高职高专院校学生支部的组织生活总体上是有序的、规范的,但也存在一些不足,针对这些存在的问题,提出几点建议,切实提高高职高专学生支部组织生活的实效性.     

粘液表皮样癌Ag-NORs计数与肥大细胞计数的关系

用Ag—NORs测定肿瘤的增生活性,用甲苯胺蓝染肿瘤间质MC,结果表明,粘液表皮样癌Ag—NORs计数值和MC计数值均高于正常涎腺组,且具统计学意义。在高、中、低不同分化程度的粘液表皮样癌中,随着肿瘤分化程度下降Ag—NORs计数值升高,MC计数值减少,而且高与低分化组之间有显著差异。这一结果提示Ag—NORs计数值可以做为粘液表皮样癌的诊断和生物学行为预报的客观指标之一,并说明在肿瘤发生发展过程中,做为肿瘤间质成份的MC与肿瘤细胞的增生活性之间存在着某种复杂的关系。     

Urban activity spaces: Illustrations and application of a conceptual model for integrating the time and space dimensions

This work extends the conceptual argument for the use of ellipses to portray activity spaces and offers one example of how the ellipse construct can be used to analyze urban travel characteristics, based on observed trip making behavior and socio-economic variables. A problem in characterizing activity spaces has been in integrating the time and space dimensions into the same analytical framework while maintaining an understandable graphical representation of the space-time geographies envisioned by Hagerstrand and others. The ellipse allows this, as well as providing several quantifiable measures to be used for analyzing and characterizing activity spaces and urban travel behavior. In the current application, analysis of variance is used to analyze the resulting elliptic variables of 653 travelers. The results indicate that home location and household size are important factors in determining activity space characteristics and that the ellipse variables provide a different and useful approach for understanding urban travel behavior.