CATIA V5的人机工程功能与应用

在产品设计的过程中,人们越来越多的注重人的需求,随之产生的是对于人机工程的关注。文章介绍了CATIAV5软件人机工程模块的组成和功能,并通过汽车驾驶员座椅设计介绍了人机工程学功能的具体应用。结果表明,CATIAV5具有强大的人机工程功能。随着人们生活水平的提高,人机工程涉及的领域将会越来越广,在以后的设计过程中,人们可以通过应用CATIA对产品进行优化从而得到更好的产品。     

5-Aza-CdR对人食管癌细胞株生物学行为及TFPI-2 mRNA表达的影响

目的探讨5-氮杂-2-脱氧胞苷(5-Aza-2-deoxycytidine,5-Aza-CdR)干预对食管鳞癌细胞株Eca9706生长增殖及其组织因子途径抑制物2(tissue factor pathway inhibitor-2,TFPI-2)基因表达的影响。方法选取食管鳞癌细胞株Eca9706,并用不同浓度的5-Aza-CdR处理该细胞株。MTT法检测干预前后细胞增长率的变化,FCM法检测干预前后细胞凋亡率的变化,RT-PCR技术检测干预前后Eca9706细胞TFPI-2基因mRNA的表达,免疫组化检测干预前后Eca9706细胞TFPI-2蛋白的表达。结果食管鳞癌细胞株Eca9706存在TFPI-2基因超甲基化状态,经5-Aza-CdR处理后,超甲基化状态解除,细胞增殖受到抑制,细胞凋亡率明显提高(P<0.05);细胞中TFPI-2蛋白表达明显增强,同时mRNA的表达水平也较处理前明显提高(P<0.05)。结论食管癌细胞系TFPI-2基因超甲基化可抑制其mR-NA表达,当其超甲基化解除后,细胞增殖受到抑制,同时细胞凋亡率相应提高。     

基于“十二五”规划的南通集装箱甩挂运输发展探析

文章在分析我国甩挂运输发展前景和南通市甩挂运输优势的基础上,以南通交运集团的成功试点为背景,探讨了南通市发展集装箱甩挂运输的困难之处,并提出相应建议。     

Airline delays,congestion internalization and non-price spillover effects of low cost carrier entry

This paper develops an econometric model of flight delays to investigate the influence of competition and dominance on the incentives of carriers to maintain on-time performance. We consider both the route and the airport levels to inspect the local and global effects of competition, with a unifying framework to test the hypotheses of 1. airport congestion internalization and 2. the market competition-quality relationship in a single econometric model. In particular, we examine the impacts of the entry of low cost carriers (LCC) on the flight delays of incumbent full service carriers in the Brazilian airline industry. The main results indicate a highly significant effect of airport congestion self-internalization in parallel with route-level quality competition. Additionally, the potential competition caused by LCC presence provokes a global effect that suggests the existence of non-price spillovers of the LCC entry to non-entered routes.     

SS5型客运电力机车(2)——总体布置及通风系统

文章介绍了SS5型客运电力机车总体布置和通风系统的特点。     

广州轨道交通五号线盾构施工关键技术

研究目的：解决广州轨道交通五号线盾构施工面临的诸多难题，总结在复合地层中盾构施工的若干经验，为类似工程提供借鉴。研究方法：通过工程类比、现场试验及监测等手段，对盾构施工相关工法、材料及技术等进行了引进、研究和实践。研究结果：广州地铁五号线大坦沙南-中山八站盾构区间首次成功应用了盾构始发SEW工法，并完成江中超浅埋泥水盾构过江掘进；火车站-小北站盾构区间顺利通过溶洞群，填补该项国内空白；动物园站-杨箕站盾构区间超小曲线半径掘进技术实现了新的突破；车陂南站-东圃站盾构区间首次成功应用了TAC高分子聚合物，辅助盾构顺利通过浅埋砂层。研究结论：广州地铁五号线盾构施工关键技术，有效控制了土体稳定和变形，在环境岩土工程问题防治方面取得了较大进步。     

城市轨道交通列车驾驶仿真器研究

城市轨道交通列车驾驶仿真器是城市轨道交通部门进行技能培训的高科技设备,能够进行精确的列车操纵性能仿真和逼真的列车驾驶环境仿真。基本功能包括模拟操纵功能、列车动力学计算功能、故障判断培训功能、视景和声音仿真功能以及运动仿真功能。针对城市轨道交通特点,给出了轨道交通列车驾驶仿真器的运行仿真数学模型,提出采用分布式计算机体系结构、MPEG视频压缩技术和基于DirectSound技术的多媒体声音系统,设计具有4层5自由度液压运动平台的驾驶仿真器。并基于以上技术完成了北京地铁交流传动电动客车列车驾驶仿真器的研制,成功应用于北京地铁技术学校学员和北京地铁司机的教育培训。     

多孔PZT95/5压电陶瓷性能的研究

本次实验主要研究在制备过程中加入抑制剂、PEG、胶凝剂等对PZT95／5粉体的影响,此外,研究了掺杂物(铌盐)的掺入方式及加入量对PZT95／5粉体性能的影响。     

基于AUTOCAD的电气原理图综合系统的开发

为能实现电气图纸信息的数字化，将传统的AUTOCAD绘图方式与CADDS5电气设计进行了较好的融合，从而实现了在AUTOCAD环境下绘制电气原理图，取代了在CADDS5电气模块中原理图繁琐的输入环节。     

The small-sized benthic biota of the Håkon Mosby Mud Volcano (SW Barents Sea slope)

R/V POLARSTERN expedition ARK XVIII/1 in summer 2002 provided the opportunity to carry out a sampling programme to assess the activity, biomass and composition of the small-sized benthic biota (size range: bacteria to meiofauna) around the active mud-oozing and methane-seeping H5;kon Mosby Mud Volcano (HMMV) on the SW Barents Sea slope, Northern North-Atlantic. A total of 11 stations, covering different areas (e.g., bacterial mat sites, and pogonophoran fields) within the crater, and sites outside the caldera were sampled using a multiple corer. Subsamples were analyzed for various biogenic compounds to estimate the flux of organic matter to the seafloor (sediment-bound chloroplastic pigments indicating phytodetritus), activities (bacterial exo-enzymatic turnover rates) and the total biomass [from bulk parameters, like phospholipid (PL) concentrations in the sediments] of the smallest sediment-inhabiting organisms (range: bacteria to meiofauna). Direct investigations of bacterial numbers and biomasses as well as on meiofauna densities and composition completed our investigations at HMMV. As expected for a comparable small deep-sea area with only minor disparity in water depth between sampling sites, our investigations revealed generally no significant differences in organic matter input from phytodetritus sedimentation between sampling sites inside and outside HMMV. Bacterial exo-enzymatic activities as well as total microbial biomass (TMB) and meiofauna densities, however, exhibited generally higher values at HMMV, compared to sites outside the mud volcano. Enhanced benthic life at HMMV is based on chemosynthetic processes, making the mud volcano a “chemosynthetic oasis” in an otherwise oligotrophic deep-sea environment. As we did not find any indication for bacterial symbioses in the meiofauna, comparably rich meiofaunal assemblages at HMMV are presumably indirectly related to a general enhanced biological production.