Co2+离子掺杂对TiO2结构与光催化活性的影响

论文采用溶胶-凝胶法制备Co2+掺杂的TiO2纳米粉末,以苯酚为目标污染物研究了Co-TiO2在不同的光源（紫外、可见）下的光催化活性,并利用XRD、EFSEM、UV-DRS和XPS等手段分析Co-TiO2结构与光催化活性的关系。结果表明,一部分Co2+离子成功进入TiO2晶格,有助于金红石相向锐钛矿相转变;另一部分Co2+离子在催化剂表面生成Co3O4,可与TiO2形成p-n异质结,两种结构变化均增强了光催化活性,且催化剂光谱吸收范围拓展至可见光区域。当Co2+掺杂量为1.0%,焙烧温度为773K时,Co-TiO2比表面积约为28.4m2/g,锐钛矿含量达到70.6%,光催化活性最好。2小时内,在紫外和可见光下,Co-TiO2对苯酚的降解率分别为97.7%和52.3%,均优于纯TiO2。     

Delays caused by motorized vehicles unable to clear intersections in China： Graphical analysis

In many Chinese cities,motorized vehicles （M-vehicles） move slowly at intersections due to the interference of a large number of non-motorized vehicles （NM-vehicles）.The slow movement makes a part of M-vehicles fail to leave intersections timely after the traffic signal tums red,and thereby conflicts between vehicles from two directions occur.The phenomenon was analyzed graphically by using the cumulative vehicle curve.Delays in three cases were modeled and compared：NM-vehicle priorities and M-vehicle priorities with all-red intervals unable to release all vehicles,and longer all-red intervals ensuring release all vehicles.Marginal delays caused by two illegal behaviors that occasionally happened in mixed traffic intersections were also investigated.It is concluded that increasing the speed of M-vehicles leaving intersections and postponing the entering of NM-vehicles are the keys in mathematics,although they are uneasy in disordered mixed traffic intersections due to a dilemma between efficiency and orders in reality.The results could provide implications for the traffic management in the cities maintaining a large number of M-and NM-vehicles.     

过载振动复合条件下的加速度计不对称性误差分析

为研究过载-振动复合条件下加速度计不对称性引入误差的影响,建立了包含加速度计模型不对称性的振动整流误差数学模型,并给定相关参数进行仿真分析.分析结果表明,当过载大于等于振动加速度幅值时,可忽略加速度计不对称性引起的振动整流误差;在给定的仿真情况下,当过载小于振动加速度幅值时,加速度计不对称性引起的振动整流误差小于全部振...     

道路传感器监测数据异常辨识方法

足尺加速加载试验场具有复杂的路面结构,其中埋设了多种传感器用于监测路面性能的各项指标.由于传感器采集的数据具有高频海量的特点,使用传统方法进行异常数据的辨识效率低且精度差.针对该问题,本文通过特定软件将原始高频采集数据进行可视化,再将得到的可视化后数据进行类别标注,以此作为原始数据集;接下来针对可视化后的数据形状特征突...     

一种提高微生物发酵单位的新优化控制策略

为了提高微生物发酵单位,提出了支持向量机（SVM）与基于实数编码遗传算法（RGA）相互耦联的优化控制策略。为解决发酵参数之间的耦合问题,进一步引入了模式的概念。SVM建立微生物发酵过程的预估模型,RGA以此模型为适应度函数计算最优控制模式。此策略应用于青霉素发酵过程的优化控制,效价比没有实施优化控制策略的生产结果提高了22.88％。     

构造复杂区域煤层开采的矿压显现规律研究

以东滩煤矿3303综放工作面在FS46断层附近的轨道顺槽为研究背景,采用数值模拟与现场观测相结合的方法,探讨了3303综放面轨道顺槽在上覆煤层开采期间的应力分布变化情况,并通过对3203工作面回采巷道变形量的分析,对应力集中区域进行分析和划定,进一步认识了构造复杂区域的矿压显现规律,揭示出复杂地质构造对煤层开采的影响规律,为类似地质条件的工作面进行高产、高效、安全生产提供借鉴.     

Individual departure time decision considering departure scheduling utility

The scheduling utility plays a fundamental role in addressing the commuting travel behaviours. A new scheduling utility,termed as DMRD-SU, was suggested based on some recent research findings in behavioural economics. DMRD-SU admitted the existence of positive arrival-caused utility. In addition, besides the travel-time-caused utility and arrival-caused utility, DMRD-SU firstly took the departure utility into account. The necessity of the departure utility in trip scheduling was analyzed comprehensively,and the corresponding individual trip scheduling model was presented. Based on a simple network, an analytical example was executed to characterize DMRD-SU. It can be found from the analytical example that: 1) DMRD-SU can predict the accumulation departure behaviors at NDT, which explains the formation of daily serious short-peak-hours in reality, while MRD-SU cannot; 2)Compared with MRD-SU, DMRD-SU predicts that people tend to depart later and its gross utility also decreases faster. Therefore,the departure utility should be considered to describe the traveler’s scheduling behaviors better.     

4-氨基吡啶的合成工艺进展

分别介绍了以异烟酸为原料经酯化、酰胺化、霍夫曼降解反应合成4－氨基吡啶；以吡啶为原料，经氧化，硝化，铁－酸还原或催化加氢合成4－氨基吡啶及其他合成4－氨基吡啶的路线，并对这些路线进行了探讨。     

小口径长距离越江钢顶管测量分析

本文以绍兴城市北部区域供水保障工程为例,对如何实现小口径长距离钢顶管的测量进行初步的理论及技术探讨。     

CXWT(重)型纺织机的应用与改进研究

详细介绍了CXWT(重)型纺织机的基本参数,对该类型的纺织机具体应用时存在的主要问题进行分析归纳,参考国外比较先进的进行应用与改进方面的研究,并结合我国两个"五年发展纲要"的具体政策,探讨我国CXWT(重)型纺织机的改进策略,在立足理论研究的基础上,进行实践操作研究,对于纺织行业生产力的提升和新技术的应用具有较高的实用价值。