配送车辆的配送成本和碳排放的比较实证研究——以广西壮族自治区烟草公司北海市公司为例

本文主要研究的是在节能减排的背景下,在考虑配送中所产生的成本和碳排放问题基础上,在原有的燃油配送车的基础上,广西壮族自治区烟草公司北海市公司尝试引入了1辆新能源（纯电）配送车,在收集具体案例的数据后,经过计算和比较,发现纯电配送车在碳排放比燃油配送车降低0.58T碳排放量,在成本上节约0.85元/公里,确实减少了碳排放和降低了成本,应继续引进新能源（纯电）配送车。     

便携式制动性能测试仪的使用经验

在汽车检测中,经常会遇到各种问题,影响到检测的效果.高精度和耐冲击性的便携式制动性能测试仪的应用,提高了车辆制动性能的检测效果.     

对我国高速公路客运市场存在问题的思考

介绍了我国高速公路客运市场存在的问题,并提出相应的建议和措施。     

同站台换乘站线路组合方案研究

提出同站台换乘车站的5种典型线路组合方案,结合重庆轨道交通线网规划的实际工程进行分析对比,认为双层四线车站的线路组合、单层四线车站到双层四线车站的线路组合,以其合理可行性和整体经济性,可作为同站台换乘车站线路组合的首选方案.     

重庆城市轨道交通建设管理研究

结合重庆轨道交通建设管理实际工作，从建设前期管理、建设过程管理以及控制保护区管理3个方面进行分析，归纳存在的主要问题并提出改进措施。最后，从城市轨道交通可持续发展的角度提出3点建议。     

纵断面线路参数对直线电机列车的动力影响

研究目的:为了确定纵断面线路参数取值对LIM列车运行舒适性和安全性的影响规律,基于首都机场线LIM地铁系统参数建立列车-线路三维耦合动力学模型,分析在纵断面线路参数和车速影响下,LIM地铁系统动力响应特性,拟合得到车体最大垂向加速度、轮轨最大垂向力、最大轮重减载率与竖曲线类型、竖曲线半径、列车行驶速度之间的关系公式。研究结论:(1)凹形竖曲线会增大列车垂向加速度和轮轨垂向力,减小轮重减载率;(2)凸形竖曲线会减小列车垂向加速度和轮轨垂向力,增大轮重减载率;(3)车体最大垂向加速度、轮轨最大垂向力、最大轮重减载率均与曲线半径的倒数相关;(4)车体最大垂向加速度、轮轨最大垂向力、最大轮重减载率均与车速的平方相关;(5)本研究成果可为LIM地铁系统纵断面线路参数优化提供理论依据。     

Numerical method of electromagnetic pulse response of conductor with complex load北大核心CSCD

[Objectives]Electromagnetic pulse can seriously affect and even destroy naval shipborne electronic information systems, weapons, equipment and so on. Due to the complexity of the antenna port load circuit, it is necessary to formulate a numerical method which can easily obtain the antenna load current. [Methods]The induced current of the terminal is obtained on the basis of the finite-difference time-domain (FDTD) and Holland model. According to the Thévenin equivalent circuit, the conductor is equivalent to the voltage source to realize decoupling between the conductor and load end, and the load circuit is solved using Simulink software.[Results]Compared with the traditional terminal model, this method is simple and feasible for high-order circuit processing. The effectiveness of the model is verified using non-linear elements and parallel capacitors and resistors as the load respectively. The results show that the calculation results of this method are consistent with those of the traditional methods. Finally, the antenna of the end-connected protect- or is calculated. The results show that the lead inductance caused by the installation of the protector is an important factor affecting the protection performance.[Conclusions]The method proposed in this paper can greatly reduce the simulation complexity of the coupling current of an antenna with a complex load, giving it useful reference value for the field of ship electromagnetic pulse protection design. © 2023 Editorial Department of Chinese Journal of Ship Research. All Rights Reserved.