PCA8538在电动汽车仪表盘上的应用与调试

提出了一款液晶显示器在电动汽车仪表盘上的应用方案。以LM3S811为控制核心,介绍了PCA8538液晶显示屏在仪表盘信息显示。使用I2C驱动PCA8538,给出了语音电路和矩阵键盘接口电路,最后通过VC设计了调试PCA8538的界面。该仪表盘比传统的电动汽车仪表盘具有更好的显示效果和更多的显示信息。     

浅谈大学英语四级阅读理解新题型解题技巧

大学英语四级考试改革新题型中,阅读理解分值占总体分值的35%比例,直接影响考生是否能够顺利通过四级考试,本文就大学英语四级考试中阅读理解新题型的变化作出了详细的分析,总结相应答题技巧,提高考生阅读理解的应试能力。     

~(131)I对甲状腺HTori 3细胞凋亡及周期的影响

目的研究131I诱导人甲状腺HTori 3细胞凋亡、周期阻滞及其与Bcl-2、Fas等基因表达的关系。方法 HTori3细胞经131I照射后,MTT方法检测细胞存活率;流式细胞仪检测细胞凋亡及周期分布;QRT-PCR及Western blot检测细胞凋亡相关基因Bcl-2、Fas的mRNA及蛋白表达水平的变化。结果 MTT结果显示不同放射性活度(7.4、14.8、29.6MBq/mL)的131I作用于HTori 3细胞不同时间(24、48、72、96h)后,对HTori 3细胞增殖有明显的抑制作用(P<0.05)。14.8MBq/mL131I作用于细胞24、48、72h后,出现明显的细胞凋亡(P<0.05)。14.8MBq/mL131I作用细胞12、24、48h后,G2/M期细胞所占百分比增加(P<0.01)。实时定量PCR及Western blot结果均显示抗凋亡基因Bcl-2表达降低(P<0.05),促凋亡基因Fas表达增加(P<0.05)。结论 131I能够通过诱导HTori 3细胞凋亡及G2/M期阻滞抑制细胞增殖,Bcl-2及Fas均参与了131I诱导HTori 3细胞凋亡的过程。     

催化分解二茂铁制备碳纳米片及其结构表征

以二茂铁为催化剂和碳源,硫粉为辅助剂,采用催化分解技术,在500°C时制备碳纳米片,成炭率高达95％左右．结构测试结果表明：酸处理后的主要产物为非晶碳纳米片,其厚度约为40 nm．氮气吸附脱附结果表明：合成的碳纳米片为介孔材料的特征吸附脱附等温线,比表面积为41.1 m2/g,孔径主要集中在3.5～5 nm．     

基于4G网络的站台门远程监控与诊断维护系统设计

为了提高站台门系统的可维修性、降低故障维修时间和维修成本。设计以4G网络为载体、诊断维护服务器为核心、信息安全传输为关键的网络架构,实现对地铁站台门系统运行过程中的监视、故障诊断和维护,满足跨区域异地监控站台门系统各功能的运行状态。对发生的故障进行维护管理与决策,同时根据故障数据,诊断出故障原因,并生成指导性维修预案,从而提高故障诊断的准确性和现场故障的维修效率,代替人工完成对站台门系统的监控与故障诊断。     

珠三角城际铁路开行4辆编组动车组信号专业适配性方案探讨

介绍了珠三角城际铁路开行4辆编组动车组的必要性,并针对由此引发的CTCS2+ATO列控系统的适配性改造和互联互通需求进行分析,重点研究开行4辆编组动车组信号专业与站台门联动控制的适配性技术,并提出了4种解决方案.     

Estimating origin‐destination matrices from link volume counts: a simple intercity auto travel demand model for Sri Lanka

The cost of nation wide travel surveys is high. Hence in many developing countries, planners have found it difficult to develop intercity transportation plans due to the non availability of origin‐destination trip matrices. This paper will describe a method for the intercity auto travel estimation for Sri Lanka with link traffic volume data.

The paper outlines the rationale of selecting the district capitals of Sri Lanka as its “cities,” the methodology for selecting the intercity road network, determination of link travel times from express bus schedules and the location of link volume counting positions.

Initially, the total auto travel demand model is formulated with various trip purpose sub‐models. This model is finally modified to a simple demand model with district urban population and travel times between city pairs as the exogenous variables, to overcome statistical estimation difficulties. The final demand model has statistics within the acceptable regions.

The advantages of a simple model are discussed and possible extensions are proposed.     

Analytical model for information flow propagation wave under an information relay control strategy in a congested vehicle-to-vehicle communication environment

Vehicular traffic congestion in a vehicle-to-vehicle (V2V) communication environment can lead to congestion effects for information flow propagation. Such congestion effects can impact whether a specific information packet of interest can reach a desired location, and if so, in a timely manner to influence the traffic system performance. Motivated by the usefulness and timeliness of information propagation, this paper aims to characterize the information flow propagation wave (IFPW) for an information packet in a congested V2V communication environment under an information relay control strategy. This strategy seeks to exclude information that is dated in the communication buffer under a first-in, first-out queue discipline, from being relayed if the information flow regime is congested. It trades off the need to enable the dissemination of every information packet as far as possible, against the congestion effects that accrue because of the presence of multiple information packets. A macroscopic two-layer model is proposed to characterize the IFPW. The upper layer is formulated as integro-differential equations to characterize the information dissemination in space and time under this control strategy. The lower layer adopts the Lighthill-Whitham-Richards model to capture the traffic flow dynamics. Based on the upper layer model, a necessary condition is derived which quantifies the expected time length that needs to be reserved for broadcasting the information packet of interest so as to ensure the formation of an IFPW under a given density of V2V-equipped vehicles. When the necessary condition is satisfied under homogeneous conditions, it is shown that the information packet can be propagated at an asymptotic speed whose value can be derived analytically. Besides, under the proposed control strategy, only a proportion of vehicles (labeled asymptotic density of informed vehicles) can receive the specific information packet, which can be estimated by solving a nonlinear equation. The asymptotic IFPW speed, the asymptotic density of informed vehicles, and the necessary condition for the IFPW, help in evaluating the timeliness of information propagation and the influence of traffic dynamics on information propagation. In addition, the proposed model can be used to numerically estimate the IFPW speed for heterogeneous conditions, which can aid in the design of traffic management strategies built upon the timely propagation of information through V2V communication.     

API SPEC 2C规范在海上平台起重机设计中的应用

在对API SPEC 2C规范深入分析和研究的基础之上,梳理海上平台起重机的设计要点,并形成一套完整的设计准则.研究成果可为设计人员选取海上平台起重机总体参数提供帮助,为起重机的总体设计提供重要的理论依据.     

基于数据驱动的列控中心报文自动化测试研究

分析列控中心与外部系统的接口关系,结合软件自动化测试理论,提出基于数据驱动测试框架的CTCS-2列控中心报文自动化测试系统,实现了测试逻辑和测试数据的分离.对列控中心设备的测试结果表明,该方案使测试效率得到了大幅提高,取得了良好的效果.