基于宏观交通流模型的行程时间预测

以高速道路为研究对象,概述了宏观交通模型的基本方程,提出了一种基于宏观交通模拟的路径行程时间预测方法．预测方法以宏观模型输出的速度为基础计算路径行程时间,能够考虑交通拥堵以确保行程时间预测结果更合理．预测方法包含一般计算方法、由路段行程时间合成的方法（近邻组合法）这两种计算方法,后者用以加快计算速度,确保预测能够适用于较大规模路网．算例分析说明了预测方法的有效性．     

采用圆形匹配限制框的指纹特征点匹配算法

介绍了指纹特征点的匹配原理,提出了一种改进的实时指纹特征点匹配算法,并对算法性能进行了实验研究.给出了错误匹配率(FMR)和错误不匹配率(FNMR)随阈值变化的情况及算法的ROC曲线.得到算法的等错误率(EER)为1.8%,最小FMR(zeroFNMR)为6.8%,平均匹配时间为0.1s.算法在指纹库FVC2004上的实验结果表明,算法性能较好,适合于实时指纹识别系统.     

一种共轭下降算法的全局收敛性

给出了求解无约束优化问题的一种共轭下降算法,该算法具有充分下降性的共轭梯度公式。在较为温和的条件下,利用宽松的非精确线搜索条件得到全局收敛性结果,同时数值实验表明了算法的有效性。     

Evolutionary mechanism of water cycle and efficient utilization of water resources in the Haihe River Basin

Water cycle in the river basin constitutes the objective basis of water resources evolution. Whatever their manifestations, water resources problems can all attribute to the imbalances caused by the evolution of water cycle or its associated processes in the river basin. Various types of water activities for solution to water problems are in nature a regulation of "natural-social" dualistic water cycle or its associated processes in the river basin. China is one of those countries which are faced with the most violent water cycle evolution and serious water problems with the Haihe River Basin as the     

基于动态虚拟障碍物的智能车辆局部路径规划方法

针对传统人工势场法在智能车辆局部路径规划中未充分考虑车辆动力学和运动学约束的不足,提出一种基于动态虚拟障碍物的局部路径规划方法.首先根据环境、车辆运行状态和道路交通规则分析车辆行驶安全性并获得虚拟车道线的解析表达,再进行车辆驾驶行为决策并生成受约束的动态虚拟障碍物,最后采用考虑动力学和运动学约束的改进人工势场法进行局部路径规划.仿真实验表明,该方法在保证动力学和运动学约束的前提下,能够在不同初始速度、相对速度和相对距离工况下获得较好的规划性能.     

复合顶板回采巷道灾后的垮塌状态

在阐述灾后回采巷道垮塌对安全快速救援具有重要影响的基础上,结合矿压相关理论,分析了复合顶板回采巷道在锚杆悬吊原理和组合原理下的垮塌状态,分别推导出了垮空区高度计算公式以及巷道垮塌后能够造成巷道堵塞的条件,并依据不同的复合顶板条件,从利于灾后救援的角度出发,对回采巷道支护提出了相应工程建议。当复合顶板岩层分层累积厚度较小时,宜采用锚杆+金属网联合支护;当复合顶板岩层分层累积厚度较大时,则宜采用锚杆+锚索+金属网联合支护,并兼顾利用锚杆的组合作用、锚索的悬吊作用以及金属网的挡护作用。该研究对救援过程中预判巷道垮塌对救援的影响,制定相应处理方案,以及提高巷道围岩控制质量和抗灾能力,均具有重要的参考价值。     

Differently implicational α-universal triple I restriction method of （1,2, 2） type

From the viewpoints of both fuzzy system and fuzzy reasoning, a new fuzzy reasoning method which contains the α-triple I restriction method as its particular case is proposed. The previous α-triple I restriction principles are improved, and then the optimal restriction solutions of this new method are achieved, especially for seven familiar implications. As its special case, the corresponding results of α-triple I restriction method are obtained and improved. Lastly, it is found by examples that this new method is more reasonable than the α-triple I restriction method.     

磁改性海泡石对水源水中腐殖酸的吸附性能

为去除水源水中的腐殖酸(HA),自制磁改性海泡石(MSEP)并对其物化性能表征,研究MSEP对水源水中腐殖酸的吸附、脱附行为。结果表明,MSEP比表面积为25.354 m~2/g,比饱和磁化强度为32.36 A·m~2/kg。MSEP对HA的吸附等温线可用Langmuir方程拟合,吸附动力学符合准二级动力学方程。     

A Theoretical Analysis of Torque and Superlubric Motion in Bilayer Graphene Disks

To identify the relation between torque and superlubric motion, we investigate the interlayer sliding behavior of two graphene disks with numerical computation methods. The potential energy, lateral force and torque between the top and bottom graphene disks, which are associated with misfit angle, translational displacement and interlayer distance, are analyzed. The results show that the rotation of the top disk is feeble for commensurate state, but it is difficult to realize superlubricity due to the lateral force fluctuating remarkably. For incommensurate state, the flake exhibits vanishing torque approaching to zero only for partial sliding directions. The superlubricity between the top and bottom disks will be eliminated due to torque-induced reorientation along other sliding directions. Whether for commensurate or incommensurate contact, the amplitudes of the lateral force(516 p N and 13 p N, respectively) are in qualitative agreement with experimental observation(typically 250 p N and 50 p N, respectively). It shows that the interlayer torque is insensitive to the top disk size with incommensurate contact. The results suggest that the superlubric motion of graphene disk can be controlled by adjusting the torque.     

Dielectric properties of BST/MZO ceramic composites

Ba0.6Sr0.4TiO3/Mg1-xZnxO(MZO,x=0,0.05,0.10,0.15 and 0.20) ceramic composites were prepared by traditional ceramic processing.The crystal structure,fracture surface morphology,and dielectric properties were investigated.The samples with x=0,0.05 and 0.10 exhibited favorable sintering behavior,and homogeneous diphase microstructure was obtained. Nevertheless,the microstructure of the samples with x=0.15 and 0.20 was inhomogeneous and abnormal grain growth could be observed,and the abnormal grain growth induced the degradation of dielectric strength.The sample with x=0.10 has relatively low dielectric loss(1.26×10-3) and the optimal FOM value(about 174) .