快速路网单点入口匝道动态控制策略仿真评价研究

有别于以往工作,运用宏观交通网络动态建模理论与计算机仿真技术,以快速路网为考察对象,提出单点入口匝道动态控制策略的宏观交通仿真评价方法,设计了一种基于ALINEA原理的单点入口匝道动态控制算法,针对一多起点-多终点拥挤路网,开发仿真系统,给出控制前后路段交通状态时变图、全局路网交通状态图等可视化仿真结果,描述路网交通流演化,定量评价匝道控制效果。算例表明,控制后路网拥堵显著缓解,网络总耗时减少约5%。研究显示了单点匝道控制策略宏观交通仿真评价方法有助于深刻、全面、直观地理解路网交通流演化,剖析拥堵成因,设计符合全局、系统眼光的高效控制策略,给出定量评价,具有有效性与优越性。     

The crack of harden cement paste observed with multi-technique

The shrinkage of the cement paste with low water-cement ratio at different relative humidity was observed and analyzed with ESEM and deformation map technique. The crack morphology was observed with different magnification with SEM and FESEM, and the formation of the crack was observed with AFM between two C-S-H nano particles. The observation by multi technique at multi scale indicated that the shrinkage was increase with the decrease of the humidity due to the increase of the pressure of the capillary pressure, the morphology of the crack in smaller scale was similar to that in the bigger scale, the smaller crack distributed in the latticework of the bigger ones, and the crack propagated along the gap between two nano particles of C-S-H with weaker bonding.     

Oily wastewater treatment by porous ceramics mediums with surface lipophilic modification

Aiming at the treatment of difficult-to-handle oily wastewater, the ceramics filter mediums made from the iron and steel plant sludge were adopted to surface lipophilic modification so as to remove oil efficiently. The hydrolysis technique by FTIR and conductivity test indicated that under acid conditions hydrogen silicon oil did not hydrolyze but release hydrogen by chemical reaction under alkaline conditions. The results of the experiments including contact angle measurement, FTIR analysis, and SEM analysis illustrate that a layer of lipophile coating indeed exists evenly on the surface of filter mediums after modification. Furthermore, the hydrogen-containing silicone oil was combined through dehydration of Si-H bond with the -OH on the surface of ceramic filter medium.     

Equilibrium equations for nonlinear buckling analysis of drill-strings in 3D curved well-bores

With the development of drilling technology, the oil/gas well has evolved from its early vertical straight form to the inclined, horizontal, plane curved, or even 3D curved well-bore. Understanding of the buck-ling behavior of a drill-string in a well-bore is crucial for the success of a drilling operation. Therefore, equilibrium equations for analyzing the buckling behavior of a drill-string in a 3D curved well-bore are required. Based on Love’s equilibrium equations for a curved and twisted rod in space, ...     

P_2O_5和V_2O_5对CaO－Al_2O_3－SiO_2系统玻璃分相与析

Ｐ＿２Ｏ＿５和Ｖ＿２Ｏ＿５对ＣａＯ－Ａｌ＿２Ｏ＿３－ＳｉＯ＿２系统玻璃分相与析晶行为的影响膝立东，陆德明，甘朝亢（山东轻工业学院２５０１００）ＴｈｅＥｆｆｅｃｔｓｏｆＰ＿２Ｏ＿５ａｎｄＶ＿２Ｏ＿５ｏｎｔｈｅＰｈａｓｅｓｅｐａｒａｔｉｏｎａｎｄＣｒｙｓ...     

融合视觉风格和标签约束的少数民族服装图像解析

目的 少数民族服装款式结构复杂,视觉风格各异。由于缺少民族服装语义标签、局部特征繁杂以及语义标签之间存在相互干扰等因素导致少数民族服装图像解析准确率和精度较低。因此,本文提出了一种融合视觉风格和标签约束的少数民族服装图像解析方法。方法 首先基于本文构建的包含55个少数民族的服装图像数据集,按照基本款式结构、着装区域、配饰和不同视觉风格自定义少数民族服装的通用语义标签和民族语义标签,同时设置4组标注对,共8个标注点;然后,结合自定义语义标签和带有标注对的训练图像,在深度完全卷积神经网络SegNet中加入视觉风格以融合局部特征和全局特征,并引入属性预测、风格预测和三元组损失函数对输入的待解析图像进行初步解析;最后,通过构建的标签约束网络进一步优化初步解析结果,避免标签相互干扰,得到优化后的最终解析结果。结果 在构建的少数民族服装图像数据集上进行验证,实验结果表明,标注对有效提升了局部特征的检测准确率,构建的视觉风格网络能够有效融合少数民族服装的全局特征和局部特征,标签约束网络解决了标签之间相互干扰的问题,在结合视觉风格网络和标签约束网络后,能够明显提升少数民族服装解析的平均精度,像素准确度达到了90.54%。结论 本文提出的融合视觉风格和标签约束的少数民族服装图像解析方法,能够提高少数民族服装图像解析的准确率和精度,对传承祖国文化、保护非物质文化遗产具有很好的意义。     

结合边缘轮廓和姿态特征的人体精确解析模型

针对着装场景中由于人体姿态、边缘轮廓、服装配饰的复杂性以及着装部位关节点被遮挡等因素导致人体解析精度较低的问题,提出一种结合边缘轮廓和姿态特征的人体精确解析模型.首先采用残差网络ResNet-101作为主干网络表征输入人体图像进行初步人体解析,得到粗解析特征;然后构建边缘轮廓模块,结合上采样后的全局和局部特征得到人体边缘轮廓;再基于着装姿态定义着装姿态损失函数,通过姿态估计模块提取人体姿态特征;最后联合粗解析特征、边缘轮廓和姿态特征,并定义结构损失和人体解析损失的组合函数输出精确的解析结果.在多个数据集上的实验结果表明,该模型的mIoU评测指标提高了1.96％,在人体的着装姿态和部位遮挡等方面获得了更准确的语义分割结果,能有效地提高着装人体解析的精度.     

一款基于运输机场飞行训练保障系统的分析与研究

飞行训练工作是为民航发展提供飞行人才,但在面对空域资源日趋紧张情况下,飞行训练工作压力日益增大,安全保障需要提高,以减轻管制和飞行指挥人员的工作负荷并有效提升工作效益.飞行训练保障系统研制的目的是针对运输机场和通用航空的特点,提出研制信息集成交换共享系统,保障航班和飞行训练安全.     

Research and Practice of Hybrid Teaching for Software Testing based on Interactive Learning

To address the problems of insufficient number of personalized exercises and cases and teachers' lack of grasp of students' weak knowledge points in the current software testing online courses, we study the strategy of establishing and updating intelligent exercise sets and case libraries and analyze the answers and dig out the weak points of knowledge through group intelligence reasoning and interactive machine learning methods. This will help teachers to make uniform and targeted explanations, reduce manual judgment, and achieve intelligent teaching quality reform, and implement the educational concepts of "keeping up with the times" and "teaching according to students' abilities".     

Controllable preparation and superior rate performance of spinel LiMn<Subscript>2</Subscript>O<Subscript>4</Subscript> hollow microspheres as cathode material for lithium-ion batteries

Spinel LiMn₂O₄ microspheres and hollow microspheres with adjustable wall thickness have been prepared using controllable oxidation of MnCO₃ microspheres precursors and following solid reactions with lithium salts. Scanning electron microscopy (SEM) investigations demonstrate that the microsphere morphology and hollow structure of precursors are inherited. The effect of hollow structure properties of as-prepared LiMn₂O₄ on their performance as cathode materials for lithium-ion batteries has been studied. Electrochemical performance tests show that LiMn₂O₄ hollow microspheres with small wall thickness exhibit both superior rate capability and better cycle performance than LiMn₂O₄ solid microspheres and LiMn₂O₄ hollow microspheres with thick wall. The LiMn₂O₄ hollow microspheres with thin wall have discharge capacity of 132.7 mA·h·g^-1 at C/10 (14.8 mA·g^-1) in the first cycle, 94.1% capacity retention at C/10 after 40 cycles and discharge capacity of 116.5 mAh·g^-1 at a high rate of 5C. The apparent lithium-ion diffusion coefficient (D _app) of as-prepared LiMn₂O₄ determined by capacity intermittent titration technique (CITT) varies from 10^-11 to 10^-8.5 cm²·s^-1 showing a regular “W” shape curve plotted with test voltages. The Dapp of LiMn₂O₄ hollow microspheres with thin wall has the largest value among all the prepared samples. Both the superior rate capability and cycle stability of LiMn₂O₄ hollow microspheres with thin wall can be ascribed to the facile ion diffusion in the hollow structures and the robust of hollow structures during repeated cycling.