文化角

名车标志趣谈 桑塔纳大众牌轿车是德国大众汽车公司的产品,标志图案中采用了叠加的VW字样(VW系德文大众车的缩写).1981年试制出的新型车以“桑塔纳”命名,其寓意如下:该车如美国加州盛产名贵葡萄酒的“桑塔纳山谷”一样闻名,像该山谷中经常刮起的一股股强劲、凛冽的旋风——著名的“桑塔纳旋风”一样风靡全球.     

铁路用Madvac垃圾清除机

Madvac已采用了1种可过滤2 μm灰尘的过滤系统,用于Madvac 61真空吸尘的杂物收集器.该过滤系统实际上是在杂物收集过程中清除灰尘.二级过滤可以阻止灰尘穿过通风机,以防止阻塞和损坏真空通风机和通风发动机. Madvac 61可以对来自轨道和车站结实的垃圾,如罐头、瓶子、报纸、塑料、香烟过滤嘴以及塑料袋等进行压紧.该机器设有一根长12 m、直径为13 cm或20 cm的软管,其收集垃圾达545 L. 该机器设有合金铸铁离心通风机,且适用于柴油、汽油、丙烷或电力形式. 王荭译自2001,№1,39 魏晓东校     

编组场尾部车辆溜放仿真系统的研究

为了确切地描述编组场尾部货车溜放的运动规律，为科学、合理地制定防溜器的安装方案提供依据，根据车列纵向动力学的方法，分析了车列溜放过程中存在的各种纵向力，采用面向对象模块化设计方法编制了编组场尾部货车溜放仿真软件。本系统的开发实现了实时模拟各种工况下货车溜放过程。     

Serum concentrations of laminin and fibronectin in patients with acute coronary syndromes

Objective To study the serum iaminin (LN) and fibronectin (FN) changes in acute coronary syndromes (ACS), and explore the role of them in assessing the severity of ACS. Methods This study included 46 ACS patients [25 with acute myocardial infarction (AMI) and 21 with unstable angina (UA)], 51 stable angina (SA) patients and 47 people without CHD as controls. Serum levels of LN, FN, fibrinogen and blood fat were assessed. Coronary angiography were performed on 49 of them. Results The serum concentration of LN was lower in ACS patients [(85.20±27. 57)ng/mL], higher in SA patients [(116. 80 ± 28. 80)ng/mL] as compared to that in the control group [(100.06±29.96)ng/mL], with significant difference among the groups (P<0.05). No difference was found in FN among the three groups. However, the subgroup analysis in the group with ACS showed that the serum concentration of FN was significantly higher in UA patients [(229.60±121.39)μg/mL ], and lower in AMI patients [(108.31±47.12) μg/mL ]. The serum LN and FN concentration could respectively enter the logistic regression equations of ACS patients and US patients. Neither LN nor FN concentration was correlated with narrowing of coronary artery of angiography. Conclusion Serum LN and FN level may be a useful indicator for stability of atherosclerosis plaque in coronary arterial disease patients, but could not predict the extent of narrowing in coronary angiography.     

冷链配送那点事

为了能够使本期独家策划的城市配送专题做得有深度，了解城市配送企业发展路上的甜酸苦辣，笔者在认真地筛选了几个开展城市配送业务的代表性企业作为采访对象之后，     

可启闭船艏的结构设计研究

可启闭船艏结构是一种新型的特殊水密门结构。详细介绍了船艏结构的设计特点及考虑的影响因素,通过模型试验方法确定了设计外载荷,并对船艏结构有限元模型在开启状态下的应力和变形进行了计算。根据计算结果对船艏结构进行了适当加强。经实船试验验证,可启闭船艏结构能够满足高速艇的使用要求。     

舰船生命力技术的若干新概念

舰船生命力是舰船攻防能力的基础条件。本文扼要叙述了舰船生命力评估的新发展，包括生命力概念、基本公式、毁伤等级划分、实射试验、工程分析仿真模型、生命力实时管理系统等，对进一步开展舰船生命力技术研究具有指导意义。     

战备器材用作建桥施工支架的设计

以某铁路立交桥中跨度 5 6m系杆拱部分施工支架的设计为例 ,就我国战备器材在桥梁施工中的应用方法进行了一些探讨 ,以更好地实现战备器材平战结合的目的