汇编和C语言函数混合编程的一种方法

开发单片机程序常用汇编语言及其编译工具FranklinC51,汇编语言的缺点是不易实现较复杂的数学计算。而C语言可以提供丰富的数学计算库函数。实现汇编和C语言函数混合编程既可提高编程效率,又能容易地完成数学计算。混合编程的关键是在统一的程序接口规则下,正确地进行参数传递。文中用一个具体的混合编程实例,说明了混合编程的一种方法,即在汇编程序中调用C语言函数。     

公路混合交通问题研究及对策

混合交通是我国公路上的一种主要交通组成形式，也是产生诸多交通问题的根源。本文分析了公路混合交通存在的客观条件，并揭示了其存在的主要问题：最后，为减少交通冲突、保证混合交通流有序流动，针对公路交叉口和公路路段提出了相应的解决对策。     

南沙地区路基软基处理方案分析及探讨

本文根据南沙地区存在深厚软弱淤泥层的特点 ,提出了路堤软基处理中可能使用的方案 ,并对每种处理方案在设计方面存在的不足加以说明 ,进而根据软土厚度和使用路段的不同给出建议方案 ,同时对“信息化施工”给出了建议     

石质边坡绿化在漳龙高速公路上的应用

根据边坡植被固土绿化的原理，在石质边坡上进行植被绿化，稳定边坡，保持水土，美化环境。结合边坡地质与植被生存的机理条件，在漳龙高速公路的石质边坡上的实践，达到了预期的绿化效果。本文从喷混植生施工技术的原理，工艺，养护管理及效果等方面进行了介绍。     

基于BIM的预制管片堆场存储与定位研究

针对上海地区预制管片堆场堆放层数不确定、堆场布局混乱、管片定位查找困难等问题,将有限元法(FEM)和建筑信息模型(BIM)技术相结合,通过对管片堆放层数仿真分析与管片定位研究,以期找到解决这些问题的方法。为此,先采用Abaqus有限元软件对预制管片堆场进行数值模拟以确定预制管片堆场每个堆位的管片堆放层数,再通过Revit、Navisworks等BIM软件对预制管片堆场进行虚拟布局。在此基础上提出一种基于BIM的混堆模式预制管片堆场定位新方法,该方法以BIM模型为核心,通过与二维码物联网技术和龙门吊智能化控制系统相结合来建立数据的转换与融合,从而实现在BIM终端三维可视化界面下对堆场中的预制管片进行精确定位查找与龙门吊最优路线运输作业。     

盖梁托换技术在高速公路桥梁改造中的应用

在工程中应用桥墩盖梁托换技术,可以解决新建项目下穿既有结构物存在的约束条件。新旧桥墩或盖梁设计、施工和监控需紧密配合,从新建盖梁预应力张拉、旧墩柱切割、施工监控数据的采集,均需保证新盖梁外包旧盖梁的安全可靠。凤凰山隧道工程起点立交匝道下穿广河高速公路,需切除广河高速公路右幅高架桥82#墩,并新建大跨门架墩替换既有82#桥墩。介绍了新建大跨门架墩的结构有限元分析、施工过程,切除原广河高速公路82#墩的墩柱并完成由四柱桥墩受力体系改变为双柱桥墩受力体系的转换和监测。     

Strategic evacuation planning with pedestrian guidance and bus routing: a mixed integer programming model and heuristic solution

This paper presents a mathematical model to plan emergencies in a densely populated urban zone where a certain numbers of pedestrians depend on transit for evacuation. The proposed model features an integrated operational framework, which simultaneously guides evacuees through urban streets and crosswalks (referred to as “the pedestrian network”) to designated pickup points (e.g., bus stops), and routes a fleet of buses at different depots to those pick‐up points and transports evacuees to their destinations or safe places. In this level, the buses are routed through the so‐called “vehicular network.” An integrated mixed integer linear program that can effectively take into account the interactions between the aforementioned two networks is formulated to find the maximal evacuation efficiency in two networks. Because the large instances of the proposed model are mathematically difficult to solve to optimality, a two‐stage heuristic is developed to solve larger instances of the model. Results from hundreds of numerical examples analysis indicate that proposed heuristic works well in providing (near) optimal or feasibly good solutions for medium‐scale to large‐scale instances that may arise in real transit‐based evacuation situations in a much shorter amount of computational time compared with cplex (can find optimal/feasible solutions for only five instances within 3 hours of running). Copyright © 2016 John Wiley & Sons, Ltd.     

Heterogeneous platoon flow dispersion model based on truncated mixed simplified phase‐type distribution of travel speed

Existing research on platoon dispersion models either describe homogeneous traffic flow feature, or are in lack of analytical solutions. By analyzing the field data, the truncated mixed simplified phase‐type distribution is proved to be capable of capturing the characteristics of heterogeneous traffic flow with an excellent fitting result. In light of this, we derive a generic heterogeneous platoon dispersion model with truncated mixed simplified phase‐type of speed in the forms of integrable functions. Numerical case studies are conducted to compare the performance of the proposed model and the conventional models (i.e., the Robertson model and truncated mixed Gaussian model). The results show that the proposed model not only better captures the platoon dispersion laws of heterogeneous traffic flow, but also presents higher computational efficiency, which provides practical implications on traffic signal control. Copyright © 2017 John Wiley & Sons, Ltd.     

电厂灰渣在混凝土中的应用

以大量实验数据为基础,论证了液态渣取代普通混凝土中细骨料煤灰部分取代水泥的可能与与可行性。最后得出在保证混凝土强度,耐久性及其它主要物理力学指标均未降低的条件,液态渣可完全取代取细骨料,不同种类粉煤灰配以一定量的减水剂,可以以不同比例部分超量取代水泥的结论。     

混合型曲率有限元的一种构造方法

本文讨论了混合列式中的曲率有限元的“自锁”问题,并综合已有的方法,建议了一个构造曲率有限元的简单方法。本文还构造了一个三节点曲梁单元和一个四节点圆柱壳元。数值结果表明,它们均无“自锁”,并有良好的精度。