铁路无线电通信GSM-R频率干扰分析及排查

GSM-R提供铁路专用通信业务,为保证铁路列车在高速运行下可靠通信,不能对铁路通信造成干扰。介绍京沪高铁先导段频率干扰排查情况,对干扰情况进行分析,提出合理化建议。     

CRH3型动车轨道旁电磁干扰测试

对武广客运专线上高速运行的列车弓网系统所产生的电磁干扰进行实测分析,内容包括地点的选择、天线的摆放与极化、测试仪器的选择与设置等。考虑扫描时间、放电时间以及离线过程中电弧的形态,对GB/T24338.2中定义的测试方法进行优化和改进,提出了适合于高速列车电磁干扰频谱的抓取方式;结合测试数据,探讨对数周期天线在不同极化方式下对测试结果的影响,以及不同的分辨率带宽对测试频谱和内部参数的影响;提出了标准中有待进一步修订的项。     

牵引缓冲梁与齿轮箱干涉分析计算

文章介绍武汉轨道交通1号线车辆动车车体牵引缓冲梁与齿轮箱之间的干涉分析计算方法,探讨了分析计算所需考虑的参数,对轨道交通车辆整车的干涉分析计算起到借鉴作用。     

轨道电路并行线路间的干扰分析

分析了同方向载频并行线路间存在的干扰途径,对3类主要干扰途径的形成原因与主要相关因素进行了简要的阐述.     

高职英语专业学生句法复杂性的发展特点研究

英语写作能力的培养是高职英语教学的重要组成部分,而衡量作文质量的语言特征中句法特征占重要位置。本研究以我院商务英语专业二年级学生的英语写作习作作为分析语料,通过对不同成绩段学生的写作习作中的句法特征的比较以及抽样语料与英语本族语言者作文的句法复杂性特征比较,分析不同层次英语句法复杂性特征上的差异,检验教学干预对学生书面语言使用的影响,并找出学生习作中句法复杂性方面存在的问题和解决办法。     

One-dimensional modelling of the plankton ecosystem of the north-western Corsican coastal area in relation to meteorological constraints

In order to study the influence of wind mixing on the spring variability of the plankton production of the north western Corsican coastal area, a one-dimensional (1D), vertical, coupled hydrodynamic/biological model (ECOHYDROMV) is used. A hydrodynamic 1D model of the water column with a k–l turbulent closure is applied. The biological model comprises six state variables, representing the plankton ecosystem in the spring period: phytoplankton, copepods, nitrate, ammonium, particulate organic matter of phytoplanktonic origin and particulate organic matter of zooplanktonic origin. The system is influenced by turbulence (expressed by the vertical eddy diffusivity), temperature and irradiance. The model takes into account momentum and heat surface fluxes computed from meteorological data in order to simulate a typical spring atmospheric forcing for the considered area. Results show that primary production vertical structure is characterised by a subsurface maximum which deepens with time and is regulated by the opposite gradients of nitrate concentration and irradiance. Surface plankton productivity is mainly controlled by turbulent vertical transport of nutrients into the mixed layer. The short time scale variability of turbulent mixing generated by the wind appears to be responsible for the plurimodal shape of plankton blooms, observed in the considered area. Furthermore, the model is applied to the study of the spring evolution of the plankton communities off the bay of Calvi (Corsica) for the years 1986 and 1988. In order to initiate and validate the model, time series of hydrological, chemical and biological data have been used. The model reproduces accurately the spring evolution of the phytoplankton biomass measured in situ and illustrates that its strong variability in those years was in close relation to the variability of the wind intensity.     

汽车电器线路对仪表的干扰分析

介绍汽车电系的一些常见干扰源和干扰途径，通过实例详细分析干扰源对仪表等电子设备的影响原因，总结出避免干扰的优化布线方法。     

磁悬浮列车电磁干扰的测试及研究

针对上海磁悬浮列车在沿线某一定范围内的无线电噪声测试及结果，就磁悬浮列车对周围环境中的重要发信场和收信场以及移动通信等的潜在干扰作初步的评价和研究，为今后磁悬浮铁路的建设提供有意义的预测和建议。     

干扰红外成像制导武器的手段与发展动向

现代战争中,干扰红外成像制武器发挥着越来越重要的作用。介绍国外干扰红外成像制武器的发展情况与干扰动向,指出发展干扰红外成像制武器的优势和重要性,并对干扰红外成像制武器的干扰方法进行了分析探讨。     

几种客车悬架与转向传动装置的运动校核

针对目前客车常用的几种悬架系统,讨论悬架系统与转向系统共同工作的运动校核,为悬架系统与转向系统的布置提供参考。