沥青面层施工质量变异性的分布特征

在现场检测和室内试验研究的基础上,分析在沥青面层施工过程中沥青混合料材料组成变化、特别是级配组成变化特点,分析现场压实厚度和空隙率变化及其分布特征,从而掌握沥青路面施工质量特征,结果表明:沥青混合料的生产级配曲线多呈S型,粒径≤0.074mm的粉料含量有着超出设计上限的趋势,摊铺机后混合料级配离析程度随着摊铺宽度而增加,现场空隙率分布变异性在摊铺机边缘最大,结构厚度分布变异性在2台摊铺机接缝处最大。     

小型船舶采暖方式可行性分析

文章通过对“热风炉”及“锅炉＋换热器”两种采暖方式的, 在翅片式换热器制造工艺及技术进步的前提下,对于小型船舶采用“锅炉＋换热器”采暖方式代替“热风炉”采暖方式是完全可行的,运行结果表明“锅炉＋换热器”采暖方式为小型船舶采暖方式提供了一种非常好的选择。     

欧洲的舰载防空与反潜武器系统

为了护卫下一代新型航空母舰,欧洲各国海军正合作开发护卫舰上的舰载防空与反潜武器系统。其中,法国、意大利联合建造的“地平线”护卫舰和英国45型防空护卫舰将装备用于防空和反潜的各种武器系统。另外,西班牙和挪威的护卫舰也各装备了美国和欧洲研制的各种先进武器。     

某型船用空压机虚拟拆装系统研究与开发

虚拟现实技术已经广泛应用与各个领域。将虚拟现实技术应用到操作训练中,不仅可以降低训练成本,而且不用受制于场地的限制。本文设计并实现了基于VC和EON的船用空压机虚拟拆装训练系统,通过EonX控件实现EON和VC之间的通信,并且将学生的训练信息记录在数据库中,可以根据记录的信息进行有针对性的训练,起到较好的训练效果。     

Study of the current incentive rules and mechanisms to promote biofuel use in the EU and their possible application to the civil aviation sector

This paper deals with the need of introducing biofuels for the use of the civil aviation sector, and the different possibilities of application of incentive mechanisms if the existing market conditions do not allow their direct commercialisation. After an introduction on the main features of the civil aviation impact on climate change, a historical review of the European Union regulations to promote the energy extraction from biological resources is presented. The different incentive policies around the world are revised and compared and some indications are offered on the most recommendable procedures that might be carried out in the near future.     

浅析摩托车空滤器连接管的工艺性能

空滤器连接弯管是连接空滤器、化油器及发动机的关键部件,由NBR PVC材料制成,如工艺控制不好,会导致此件断裂老化,灰尘、砂粒、异物很容易通过化油器进到发动机中,引发不能起动或起动困难、异响、润滑油消耗过高、燃油消耗过高、动力不足和加速性能差等现象发生.     

Experimental investigation into the effects of air pockets on wave-in-deck loads of offshore structures

In this paper, air entrapment during slamming is an investigation subjected to an experimental method of inquiry, analysed alongside a theoretical approach obtained from previous attempts to address similar matters. The experiment consisted of assembling three different sizes and depths of artificially created pockets underneath the 1:75 deck model of a 76 m × 76 m prototype to encourage air entrapment and study how this entrapped air affects local and global loads. A parametric study is ultimately conducted on the geometry of the pocket, altering area and depth to observe the response to the pressure. Air entrapment effects were observed to reduce the magnitudes of impact pressure inside the pocket while slightly altering the force time histories in x and z-directions. Force magnitudes for global forces are significantly close to the smooth deck results. However, horizontal force data are slightly higher than their corresponding smooth deck due to additional surfaces inside the pocket. In addition, a parametric study of the depth and size of the pocket reveals that pocket depth is the dominant parameter that affects the impact pressure inside a pocket.