关于剩余格的正则滤子

基于一般的剩余格,引进了正则滤子的概念,给出了正则滤子的一些特征刻画,并且建立了正则滤子与其它一些特殊滤子(G-滤子、MV-滤子、Boolean滤子)之间的内在联系.证明了一个剩余格为正则剩余格当且仅当它的每个MP滤子是正则滤子.     

组合预测在港口吞吐量预测中的应用研究

以某港口1996—2002年吞吐量为原始数据,按照“误差平方和最小”的准则,把一元线性回归模型和GM(1,1)模型组合起来,对某港口2004—2008年的吞吐量进行了组合预测。     

基于PWM整流器的交流调速系统的仿真

将PWM整流技术引入交流调速系统。在PWM整流侧采用直接功率控制技术，实现交流侧的高功率因数；电机控制采用矢量控制技术，实现电机调速的高性能。通过Matlab／Simulink仿真，可以验证这种调速策略可以实现整个系统的功率因数接近于1，减少对电网的污染，并且可以保证电机有着优良的调速性能。     

EVS耦合地层-岩性三维地质建模方法在南宁地铁工程中的应用

为解决地质建模软件Earth Volumetric Studio（EVS）存在的地层建模方法无法对钻孔揭露地层比较复杂的情形进行层序划分，岩性建模方法无法生成连续光滑的层间界面等问题，以南宁市轨道交通3号线青秀山站至博艺路站区间段为研究对象，提出一种同时具有表达复杂透镜体和清晰的地质层面能力的EVS地层-岩性建模方法。通过工程实例将该方法分别与地层建模和岩性建模方法进行对比分析和交叉验证计算，结果表明采用地层-岩性建模方法建立的模型比单独使用地层模型和岩性模型更能反映实际的地质情况，且模型具有更高的精度，模型的相对误差和均方根误差较地层建模方法明显降低。     

基于遗传算法的重载与非重载去向开行方案比较研究

本文道德简要介绍重载运输在我国开行的现状，在此基础上建立一个重载列车去向模型。引进一个先进的算法－遗传算法求解模型，根据求得最终优化方案，比较普通直达列车和重载列车开行方案的不同，计算结果表明重载列车的开行应该重新调整现有编组计划，而不是仅仅加大原有开行方向上的编成辆数以实现重载。     

亚洲牛带绦虫成虫延伸因子-1基因的表达、纯化及免疫学分析

目的 对亚洲牛带绦虫成虫延伸因子-1(elongation factor 1,EF-1)基因进行克隆、表达和免疫学初步研究.方法 将亚洲牛带绦虫成虫EF-1克隆到原核表达质粒pET-28a( )中,在大肠杆菌BL-21/DE3中用异丙硫代-β-D半乳糖苷诱导表达,表达产物通过十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)进行鉴定,用镍离子金属螯合剂亲和层析柱进行纯化,用蛋白印迹法(Western blotting)进行免疫学分析.结果 PCR、双酶切及DNA测序结果 均表明重组质粒pET-28a( )-EF-1构建成功.重组蛋白可被感染了亚洲牛带绦虫患者血清和猪血清识别,表明其具有免疫反应性.结论 亚洲牛带绦虫成虫EF-1基因可在原核表达系统中获得具有免疫学活性的表达,为进一步研究该蛋白的功能奠定了基础.     

转K1型转向架组装工艺

介绍了转K1型转向架的结构特点和关键技术参数,着重分析了侧架导框的加工、侧架与支撑座板的组焊和转向架的组装工艺等。     

灰色线性回归组合模型在地面沉降预测中的应用

选择合适的沉降与时间的关系模型对于沉降预测而言是很重要的。根据地面沉降机理与曲线特征，对某数据序列进行了光滑性和指教规律性检验，使用线性回归和灰色模型的组合模型对该数据序列建模和预测，所得平均相对误差和均方差比值都优于GM（1，1）。研究结果表明，具有线性特征的沉降数据序列选用灰色线性回归组合模型进行短期预测效果更好。     

客运专线整孔箱梁预制裂缝控制措施

分析客运专线整孔箱梁裂缝产生的原因，阐述了控制裂缝的措施和施工过程中出现裂缝的处理方法，为今后客专900t整孔箱梁施工提供参考。     

Dynamics and fishery of the Peruvian hake: Between nature and man

Mean length in the catch of Peruvian hake (Merluccius gayi peruanus) declined drastically by 8 cm in a few months in 1992. The 1991–93 El Niño event marked the beginning of changes in bottom environmental conditions, that along with other changes in the ecosystem, were the cause of the disappearance of large sized old hake from the traditional fishing grounds and the invasion of these areas by high concentrations of small sized young hake, traditionally distributed in the southern areas. A misinterpretation of this change gave an optimistic perception of the state of the stock, leading to a large increase of the fishing fleet and therefore to an increase of the fishing pressure on this resource. Catch increased quickly to very high levels in 1996, the fishery indicators of relative abundance remained stable, while global abundance of hake was diminishing. The resource responded to these natural variations of environment and to the intense fishing pressure with changes in some aspects of its biology and ecology. The most remarkable was the decrease of the length and age at first maturity that led to spawning by 1 year old (19 cm) individuals in a species whose observed longevity was 14 years.In 2002 a total and indefinite fishery closure was established by the Peruvian government and a technical commission for the hake recovery was created, which carried out continuous monitoring of the stock. After a closure of 20 months the indicators showed signs of recovery and the fishery was reopened in 2004. However, after an encouraging beginning during 2004 and the first quarter of 2005, neither abundance nor age structure had improved by the end of 2005, and in fact were deteriorating by the start of 2006. The survival of the age 2 and 3 groups was very low and few 4+ years old individuals were observed. Several factors working at different time scales have been proposed to explain the status of hake. The impact of the fishery, variations in the abiotic environment, predation by the jumbo squid (Dosidicus gigas) and cannibalism were considered as potential causal factors of this decline.