邻避设施选址过程中公共参与方式选择研究

邻避设施在选址过程中阻碍重重,不仅有悖项目初衷,也不利于社会的稳定与发展.以公共参与方式选择为主线,阐释公共参与方式的选择原则,将整个设施选址过程划分为选址启动、多方案编制、环境影响评价和方案确定四个阶段分别进行分析,最后总结出邻避设施选址过程公共参与方式选择表.     

低能量沥青温拌技术的应用与实践

低能量沥青温拌技术作为沥青混合料泡沫温拌技术的一种,其生产、施工过程中不需要添加任何温拌剂,因没有温拌剂生产过程的能耗与排放,系统能耗更低,并且在节约成本方面具有明显优势,这使得低能量沥青温拌技术迅猛发展,成为当前世界各国最感兴趣的温拌技术之一。笔者通过其与热拌沥青混合料的对比,介绍了低能量沥青温拌技术在欧洲的应用和实践,提出了低能量沥青温拌技术推广应用需要解决的关键性问题。     

Joining different metallic sheets without protrusion by flat hole clinching process

In this paper, we propose an architecture based on an artificial neural network (ANN), to learn welding skills automatically in industrial robots. With the aid of an optic camera and a laser-based sensor, the bead geometry (width and height) is measured. We propose a real-time computer vision algorithm to extract training patterns in order to acquire knowledge to later predict specific geometries. The proposal is implemented and tested in an industrial KUKA KR16 robot and a GMAW type machine within a manufacturing cell. Several data analysis are described as well as off-line and on-line training, learning strategies, and testing experimentation. It is demonstrated during our experiments that, after learning the skill, the robot is able to produce the requested bead geometry even without any knowledge about the welding parameters such as arc voltage and current. We implemented an on-line learning test, where the whole experiments and learning process take only about 4 min. Using this knowledge later, we obtained up to 95 % accuracy in prediction.     

车轮的感应加热淬火工艺

分别采用同时加热淬火方式和连续加热淬火方式对45钢锻件车轮进行感应淬火研究。结果表明：采用连续加热淬火方式(感应器与工件间隙6 mm、输出功率为339 kW、频率为6.3 kHz),用清水进行喷淋冷却,然后对其进行230℃×2 h炉中回火处理后,车轮外表面踏面及倒圆角区域的表面硬度为509～599 HV0.2(50～55 HRC)、淬硬层深度为3.4～4.7 mm、显微组织级别为5～7级,均能达到其技术要求,并在工业化试生产中取得了较好的应用效果。     

动态场景下移动机器人视觉SLAM

为实现动态场景下移动机器人自主定位和建图,解决传统视觉里程计方法跟踪效果差及累积误差问题,提升闭环检测的准确性和鲁棒性,提出融合深度学习的同时定位与地图构建方法。采用四叉树算法均匀化特征分布,解决动态场景特征聚集问题;通过优化的目标检测网络识别场景动态语义信息,剔除动态物体对位姿估计的干扰;充分提取场景空间结构信息,结合点特征和线特征实现位姿跟踪及回环检测,构建全局一致的环境地图。TUM数据集和真实场景实验结果表明：改进方法提升了移动机器人定位和建图的准确性和鲁棒性。     

不同收缩角喷嘴的射流仿真研究

应用Fluent仿真软件,对收缩角为5°、10°、20°、30°、40°和50°6种喷嘴在20 MPa和30 MPa压力下进行了射流仿真,并对仿真结果进行了比较分析。结果表明,轴线方向最大速度随收缩角的增大呈递减趋势;射流稳定性以喷嘴收缩角为10°的最好;不同压力条件下同一喷嘴的射流有着相似的特性。通过仿真可以为喷嘴形状和压力泵的选择提供一定的依据。     

铁盐催化剂在氧化法制备D-阿拉伯糖中的应用研究

研究了不同的铁盐在葡萄糖酸钙氧化制备D-阿拉伯糖的催化效果,通过高效液相检测葡萄糖酸钙的转化率和阿拉伯糖的含量,对比分析了不同铁盐的催化效果,确定了葡萄糖酸铁为葡萄糖酸钙制备D-阿拉伯糖的最佳催化剂,同时研究了葡萄糖酸铁在葡萄糖酸钙氧化降解制备阿拉伯糖最佳反应条件。为化学氧化法制备D-阿拉伯糖奠定了基础。     

Nonlinear properties analysis on rutting behaviour of bituminous materials with different air void contents

Rutting is one of the major distresses of flexible pavement. It is defined as the formation of longitudinal depressions along the wheel paths caused by the progressive movement of materials under traffic loading in the asphalt pavement layers or in the underlying base through consolidation or plastic flow. This structural damage has a negative financial impact to the economy. In this study, the rutting behaviour of bituminous materials with different air void contents was investigated. The dynamic cyclic compression testing was carried out to establish nonlinear material models with multiple regression technique. With the specified material models, finite element analysis was carried out to study the rutting behaviour of the wearing course materials with different air void contents in a flexible pavement structure. The simulation result shows that the rutting depth is small at the air void contents of 4.5–8% for wearing course materials. However, for the air void contents above or below this range, the rutting resistance reduces, and thus the rutting depth increases. To verify this simulation result, wheel tracking tests were performed to obtain laboratory data, and the test data was found to be very close to the simulated one. This proved that the developed nonlinear model is applicable to simulate the rutting performance of bituminous mixture and it is a convenient and economical method to be used for the design of bituminous mixtures for both new and rehabilitated pavements.     

Preparation and characterization of polybenzoxazine/trisilanol polyhedral oligomeric silsesquioxanes composites

The benzoxazine/incomplete trisilanol POSS mixtures were prepared by solvent method, and the corresponding composites were obtained after curing. The structures, curing behavior and thermal properties were characterized by FTIR, X-ray diffraction, DSC, DMA and TGA. The results showed that chemical bonds have been formed between trisilanolphenyl POSS and PBZ, and trisilanolphenyl POSS possessed better compatibility with the matrix than trisilanolisobutyl POSS; the dynamic viscoelastic properties and thermal stability of the composites have been greatly enhanced by the incorporation of trisilanolphenyl POSS. However, the improvements on the dynamic viscoelastic properties of PBZ/trisilanolisobutyl POSS were not so markedly.