硫酸铜浓度对微蚀速率的影响

详细分析了硫酸铜浓度对过硫酸钠体系微蚀速率的影响,并对其机理进行了探讨。     

Internet of Things Based Solutions for Transport Network Vulnerability Assessment in Intelligent Transportation Systems

Intelligent Transportation System (ITS) is essential for effective identification of vulnerable units in the transport network and its stable operation. Also, it is necessary to establish an urban transport network vulnerability assessment model with solutions based on Internet of Things (IoT). Previous research on vulnerability has no congestion effect on the peak time of urban road network. The cascading failure of links or nodes is presented by IoT monitoring system, which can collect data from a wireless sensor network in the transport environment. The IoT monitoring system collects wireless data via Vehicle-to-Infrastructure (V2I) channels to simulate key segments and their failure probability. Finally, the topological structure vulnerability index and the traffic function vulnerability index of road network are extracted from the vulnerability factors. The two indices are standardized by calculating the relative change rate, and the comprehensive index of the consequence after road network unit is in a failure state. Therefore, by calculating the failure probability of road network unit and comprehensive index of road network unit in failure state, the comprehensive vulnerability of road network can be evaluated by a risk calculation formula. In short, the IoT-based solutions to the new vulnerability assessment can help road network planning and traffic management departments to achieve the ITS goals.     

刚性桩复合地基沉降计算分析

根据沉降计算理论,引入二元联立方程组法、简易二元联立方程组法、均布桩二元联立方程组法计算刚性桩复合地基沉降,最后将工程实测结果和本文计算分析的结果进行对比分析,发现二元联立方程组法、简易二元联立方程组法与工程实测较为接近实测结果,均布桩二元联立方程组法与工程实测有一定偏差;为了更好的满足实际工程应用,对二元联立方程组、简易二元联立方程组进行修正,使其与工程实测值更为接近,更适合计算刚性桩复合地基的沉降.     

新型剑杆织机引纬机构的反求建模与运动学仿真

为了提高剑杆织机引纬机构的设计灵活性和运动性能,提出了一种新型偏心圆-非圆齿轮行星轮系引纬机构。根据引纬机构的工作要求,设定了理想的剑杆运动规律,并建立了由理想引纬运动特性反求机构参数的数学模型;基于MatLab编写了该引纬机构的反求设计与仿真软件,并对该引纬机构进行参数优化和运动模拟,得到了一组较优的机构参数;最后建立了该引纬机构的三维模型,并利用机械系统动力学自动分析进行虚拟样机运动学仿真试验。实验结果显示,理论和仿真得到的剑头运动学曲线基本一致,验证了对该新型引纬机构建模和分析的正确性。     

性能数据准确性自动监测方法的研究

本文对TD-LTE性能统计数据从底层到上层应用的数据准确性自动检测进行了研究,提出了一种实现各数据环节进行多角度全面监测性能数据准确性的方法,形成了一套自动长期监测性能统计数据的流程。     

Fe2VO4 Hierarchical Porous Microparticles Prepared via a Facile Surface Solvation Treatment for High‐Performance Lithium and Sodium Storage

Preventing the aggregation of nanosized electrode materials is a key point to fully utilize the advantage of the high capacity. In this work, a facile and low‐cost surface solvation treatment is developed to synthesize Fe₂VO₄ hierarchical porous microparticles, which efficiently prevents the aggregation of the Fe₂VO₄ primary nanoparticles. The reaction between alcohol molecules and surface hydroxy groups is confirmed by density functional theory calculations and Fourier transform infrared spectroscopy. The electrochemical mechanism of Fe₂VO₄ as lithium‐ion battery anode is characterized by in situ X‐ray diffraction for the first time. This electrode material is capable of delivering a high reversible discharge capacity of 799 mA h g^?1 at 0.5 A g^?1 with a high initial coulombic efficiency of 79%, and the capacity retention is 78% after 500 cycles. Moreover, a remarkable reversible discharge capacity of 679 mA h g^?1 is achieved at 5 A g^?1. Furthermore, when tested as sodium‐ion battery anode, a high reversible capacity of 382 mA h g^?1 can be delivered at the current density of 1 A g^?1, which still retains at 229 mA h g^?1 after 1000 cycles. The superior electrochemical performance makes it a potential anode material for high‐rate and long‐life lithium/sodium‐ion batteries.     

统计制程管制在PCB生产中的应用

统计制程管制已成为现代工业生产的重要工具之一,文章介绍了SPC的基础知识和常用工具,并简述如何在PCB企业中导入SPC。     

磁粉投加量对SBR工艺污水处理效果的影响

针对传统SBR工艺污泥絮体结构松散,沉降速率低等问题,实验采用磁化技术处理生活污水。考察磁粉(微米Fe_3O_4)对生活污水处理效果的影响,确定最佳磁粉投加量。结果表明,磁化污泥处理污水的效果要优于普通活性污泥,最佳磁粉投加量为0.5~0.7 g/L,综合考虑经济和处理效果两方面因素,选择磁粉投加量0.5 g/L较为合适。此时平均出水COD、氨氮、总氮和总磷的平均去除率分别为95.30%、91.48%、70.83%和92.80%,平均出水COD为16.60 mg/L,平均出水氨氮、总氮和总磷浓度分别2.74、10.01、0.53 mg/L,达到城镇污水处理厂污染物排放标准(GB1891-2002)一级标准。     

静态试验机中应用AD卡的软件设计

利用AD卡的扩展接口技术,与应变仪结合使用进行软件编程设计,对试验材料进行数据测量。针对AD卡接口编程开发的灵活性,进行程序设计开发软件,实现了数据采集、实时画曲线、通道选择、数据保存处理、后期曲线预览分析、试验报告预览、打印等功能。拓展了试验软件在开发设计中的新思路。