双室平衡容器在锅炉汽包液位测量中的应用

双室平衡容器是由正压补偿管、水杯、漏斗等零件焊接而成。工作过程中,饱和蒸汽因为凝结而释放的热量同时对正压补偿管和负压管加热,并且平衡容器的外层保温减少了热量的损失,从而使正压补偿管内水的重度在任何工况下都近似等于汽包内水的重度;又由于正确的选用正压补偿管的高度,不论容器内压力如何变化,正压补偿管的压力与负压管的压力变化值均相等,因此双室平衡容器输出的差压不变,即低置水位指示的水位不变。一旦水位发生变化,则输出的差压也随之变化,所以低置水位指示可以实时显示容器内的水位。     

基于随机交箱序列的集装箱堆场出口箱箱位优选

为了优选客户提交箱时间不确定条件下的集装箱堆场出口箱箱位,降低作业成本,提出了基于随机交箱序列的堆场箱位优选方法,即两阶段随机规划模型和基于禁忌搜索的启发式算法.模型通过优选贝位和堆栈最小化堆场龙门吊行车成本和翻箱量,探讨了随机交箱序列条件下的翻箱量和龙门吊行车成本求解方法,并针对模型最优解特点开发了基于禁忌搜索的启发式算法.模拟实验表明,该方法能够有效利用不确定集装箱交箱序列信息改善调度效果,算法能够在合理时间内获得满意解.     

基于低能耗理念下的遗产地保护规划设计探索

通过圆明园研修中心设计实践,遵循低碳经济的战略方向,在充分尊重文化遗产的空间环境特性前提下,结合可持续发展理念,就规划建筑组群的材质选择、规划建筑组群的组合方式、规划建筑组群的架构体系等方面进行低能耗的设计探索,以期促进文化遗产地朝着科学健康和有利于文化传承方向发展.     

碳纤维增强桉杨复合胶合板的制备及性能研究

为开发碳纤维/木基复合材,设计了全桉木、全杨木、杨桉交错、桉杨交错四种结构用桉杨复合胶合板,采用碳纤维(CF)进行表面增强,研究增强前后桉杨复合胶合板的物理力学性能以及保温性能,探讨老化前后四种结构之间的性能变化。结果表明:经碳纤维表面增强后,桉杨交错结构吸水厚度膨胀率为2.6%,下降幅度为44.7%,吸水率下降幅度为46.5%;四种结构浸渍剥离性能均满足标准,最好为桉杨交错结构;桉杨交错结构老化前纵向静曲强度为98.5 MPa,提高率为107.4%,纵向弹性模量为15810 MPa,提高率为129.8%,老化后杨桉交错结构纵向弹性模量为10150 MPa,提高率为176.3%,且杨桉交错结构胶合强度可达1.74 MPa,但对于横向静曲强度、弹性模量和胶合强度提高均较小。综合而言,碳纤维增强后物理力学性能较好的结构为杨桉交错和桉杨交错,总体反映了桉杨复合胶合板结构上纵横强度比差异较大,在实际应用中根据需求调整纵横强度设计比例;经碳纤维表面增强后桉杨复合胶合板导热系数均值为0.44 W/(m·℃),导热系数值接近保温材料,碳纤维表面增强后对其保温性能影响不明显。     

基于开源软件的电信业务平台重构设计和分析

业务平台重构是中国电信网络智能化重构举措的重要组成部分,分析了业务平台存在的问题,给出业务平台重构的要求、架构和开源实现,以管理平台为案例给出重构的路径方法,从开源思维、技术研究、人才建设角度提出重构保障要求.     

基于可视化仿真技术的集装箱港口多式运输系统研究*

采用可视化仿真技术研究集装箱港口物流系统。首先,对集装箱港口多式运输作业系统的排队网络进行了分析。其次,抽象仿真对象并对仿真模型的总体结构进行设计。然后,采用仿真软件Arena进行仿真建模,分别对泊位子模型、水平运输子模型、堆场子模型、铁路场站子模型和大门子模型进行实体流程的分析和建模。最后,实现系统的二维和三维可视化仿真。     

恒温脉动内化成工艺在铅电池生产中的应用

采用新型脉动内化成工艺,通过在化成期间控制铅电池表面温度来调节电池化成电流,充入化成所需的电量。实验结果表明,采用脉动内化成工艺使铅酸电池的容量、开路电压一致性均得到了提高,组内电池在循环中放电压差变化减小,电池循环寿命提高。     

Collaborative solutions for inter terminal transport

Major ports contain multiple container terminals, sea terminals, train, truck and barge terminal, and empty container depots, operated by different companies. Port authorities try to streamline inter terminal container transport (ITT) within congested port areas by offering expensive common road and rail infrastructure. Alternatively, individual stakeholders can set up private or collaborative container transport systems. This paper develops a framework to analyse and determine feasibility conditions of a common ITT system in a port area, depending on total transport volumes. First, we develop a simulation model to evaluate the costs of transporting containers using different modes of transport including trucks, automated guided vehicles, and multi trailer systems. Next, the required number of vehicles per mode is determined for a given throughput and waiting time. The results of the simulation are used in a game-theoretic setting to determine the cost savings per stakeholder operating in a coalition. By comparing cost savings for all possible coalitions, it is possible to determine, for each stakeholder, the attractiveness of using a common system. We find the coalitions that result in the highest savings and compare them with the infrastructure cost required to realise them. We apply the method to determine the feasibility of a common ITT system for terminals in the Port of Rotterdam and show that it only pays off in case of high demand for container transports.     

Gantry crane scheduling in intermodal rail-road container terminals

Modern rail-road container terminals serve as important consolidation nodes in intermodal transportation networks where containers are transferred between freight trains and trucks. Among the most important decision problems in these yards is the crane scheduling problem, which decides on the sequences of container moves executed by each of the parallel gantry cranes. This paper treats a rich crane scheduling problem, which considers plenty relevant constraints and is directly applicable in Chinese intermodal terminals. For solving this problem, we propose a fix-and-optimise procedure, which is easy to implement and shown to successfully solve even large-sized instances with 100 container moves in reasonable time.     

容器中液体运动及控制作用的研究现状

总结容器中液体运动对振动的控制作用,分析液体运动的两种研究方法：“集中质量法”才“浅水波理论”提出关于容器中液体运动研究的新观点。