船舶动力机械隔振设计中的功率流方法与效果评估

通过一个柔性基础上安装电机的隔振系统实例,计算其通过隔振器的功率流,应用功率流传递谱对其隔振性能进行分析评估,并附带研究了电机槽频频段的振动隔离问题,探讨了功率流分析在隔振设计中的可行性,以及功率流评估指标与振级落差指标之间的内在联系。     

用于汽车动力学实时仿真的悬架建模方法的研究

针对汽车动力学实时仿真的要求提出一种新的悬架建模方法—复合约束隔离解耦建模方法。将悬架系统视为连接车身和车轮之间的无质量复合约束,基于这个概念建立的悬架系统模型,由于实现有质量刚体的相互隔离及代数方程与微分方程的解耦,提高了模型求解效率。应用该方法建立的悬架模型,由于是面向结构的模型,因而可较为准确地描述悬架动态特性,同时由于求解效率的提高又能够满足仿真实时性的要求。     

钢轨超声波探伤仪灵敏度20%林状回波调节法

针对现场参照物调节法和对比试块调节法存在不能不断合理调节各通道灵敏度,以及探伤仪对小尺寸钢轨缺陷检出能力低的问题,分析、研究钢轨超声波探伤仪探伤质量影响因素,提出采用20%林状回波调节法调整钢轨超声波探伤仪灵敏度。介绍20%林状回波调节法调整钢轨超声波探伤仪灵敏度基本原理、操作方法和注意事项。经现场验证,该方法能够提升钢轨缺陷检出能力,符合TB/T 2340—2012《钢轨超声波探伤仪》中关于钢轨缺陷检出能力的规定,提高钢轨超声波探伤质量。     

Wooded area,forest road-killed animals: Intensity and seasonal differences of road mortality on a small,newly upgraded road in western Romania

The roads are one of the most obvious expressions of modern society, being considered vital for economical growth. Nevertheless, roads have a very strong negative impact upon environment, manifested, among others, by road mortality. In Romania numerous minor roads are currently upgraded and asphalted. In the year 2016, on a road of this kind, in a wooded mountain area, we recorded 1628 road killed animals belonging to 48 taxons. The majority were forest and wet areas animals (earthworms, snails, amphibians, etc), characteristic for the road’s vicinity. Flying or dry areas animals were fewer. The road crosses the forest and the wet areas animals’ habitats. Now, they are certain victims on the road, because its recent upgrade had increased the cars’ speed. Road mortality differed between periods and according to the road surroundings aspect. The highest road mortality intensity was registered at the end of the spring. It has dropped in the summer and then rose again in the autumn, but just moderately. The animals were affected according to their life cycle and ecological demands. On this minor road surrounded by relatively uniform wooded habitats, the road mortality differences were determined in the first place by the demandings and life cycle of the victims, which were affected by meteorological conditions. This studied road is a proof of how forest native animals are exposed once their habitat is crossed by a road.     

电压调节模块(VRM)的现状与发展

随着微处理器速度不断提高,容量不断增大,对电压调节模块(VRM)提出了更高的要求。本文介绍了非隔离和隔离型两种电压调节模块主要拓扑结构,分析了电路的特点以及电路本身的优缺点,并简单介绍了电压调节模块发展的趋势。     

关于铁路信号电源屏现行技术条件的探讨

针对铁道部关于信号电源屏相关技术条件中悬浮和隔离供电、雷电防护单元中断路器或熔断器应用、三相交流转辙机电源错相等问题的规定存在不适应或不明确的方面进行探讨。     

Effects of local roads and car traffic on the occurrence pattern and foraging behaviour of bats

The most negative impacts of roads on bats are increased mortality caused by collisions with vehicles, noise pollution reducing both communication and foraging, and barriers to movement. To test the effect of roads and traffic on the occurrence and foraging habits of bats in forested landscapes in western Poland we compared 53 sites located along local asphalt roads of low to medium traffic volume with paired reference sites on unsurfaced forest roads. Acoustical monitoring systems with Anabat detectors were used at night to detect bats at all sites. Overall, we found a strongly significant preference of bats for local asphalt roads; 640 bat passes were recorded at asphalt roads but only 271 at reference sites. Furthermore, significantly more bat taxa, longer activity and a greater frequency of feeding buzzes (calls used during foraging) were also recorded at asphalt roads. However, significant benefits were not shown for all species. This study clearly shows that local asphalt roads in forested landscapes are important foraging areas for several bat species.     

水泥混凝土路面隔离封层与缓冲封层设置技术

文章结合我国公路水泥混凝土路面设计与施工实际,介绍了新修订的《公路水泥混凝土路面施工技术规范》（JTG F30-2010）中路面隔离封层与缓冲封层设置技术,阐述了隔离封层与缓冲封层的材料要求、施工技术及质量检验方法,为水泥混凝土路面的设计与施工提供理论依据。     

林区公路设计中的合理布线方法

公路线形的选择和布设,是公路工程进入设计阶段的第一个步骤,其合理性将直接影响着后续设计过程,因此做好公路设计的布线工作尤其重要。文章结合林区公路设计现状,归纳和总结了林区公路设计中合理布线的基本步骤、原则和方法,并以大桂山林场旧路改造项目为例,介绍了林区公路合理布线的注意事项。