碱金属修饰的MoVTeO_x/SiO_2上异丁烷选择氧化制MAL反应研究

采用常规浸渍法制备了相同含量碱金属(Li、Na、K和Cs)修饰的负载型MoV0.8Te0.23MmOx/SiO2催化剂,在对催化剂进行异丁烷选择氧化制甲基丙烯醛(MAL)反应性能评价的基础上,采用BET、XRD、Raman和H2-TPR等表征技术分别考察了催化剂的比表面积、相结构、表面氧物种和可还原性等,并将实验结果与催化剂的性能进行了关联。研究表明:在反应温度为420℃时,Cs与Mo摩尔比为0.2的催化剂上MAL的收率最高;经Cs修饰的3%MoV0.8Te0.23Ox/SiO2催化剂中出现了晶相TeO2物种,在反应过程中,TeO2中的Te-O活性位被还原后能快速得到体相晶格氧的补充,从而促进晶格氧的传递

The Study on Application of Enterprise Finance and Profession Integration--The Case Analysis and Enlightenment of Finance and Profession Integration in Kingway Brewery Corporation

内容摘要企业信息化就是实现企业的资金流、物流、作业流、信息流的数字化、网络化管理，实现企业运行的自动化和企业制度的现代化。近年来，一方面政府在大力营造企业信息化建设的良好环境，积极推动企业信息化建设；而另一方面企业在推进信息化建设过程中又面临相当大的困难，存在着很多棘手问题有待解决。本文拟通过对我国当前企业信息化建设的现状及存在问题的研究，通过笔者参与实施的案例分析，提炼了企业财务业务一体化项目实施过程中带有共性的要点问题及对策，对企业信息化规划进行方法研究，为企业财务业务一体化项目实施的过程控制提供可操作性的启示和借鉴。论文共分四部分。第一部分，主要阐明企业信息化的概念及发展历程。从促进国民...Abstract An important method of improving enterprise governing structure and strengthening enterprise's key competitiveness, enterprise informationization has been accepted as a kind of best experience in the management of the flow of capital, logistics, jobs and information by extensive use of the digital and network tools. It can help enterprises run automatically under modern enterprise ...学位：经济学硕士院系专业：经济学院财政金融系_金融学(含保险学)学号：20024204

Effects of Spartina alterniflora invasion on morphological characteristics of tidal creeks and plant community distribution in the Yellow River Estuary

Large-scale invasion of Spartina alterniflora on coastal wetlands has a great impact on the morphological characteristics of tidal creeks and the succession of plant communities. Based on the remote sensing images from 2008 to 2020, we analyzed the evolution characteristics of S. alterniflora invasion and its effect on the morphological characteristics and plant community distribution of tidal flats in the Yellow River Estuary by using 3S technology, regression analysis, and statistical analysis. The results showed that the area of S. alterniflora had increased rapidly in the Yellow River Estuary since 2008, with a growth rate of 4.47 km~2·a~(-1). By 2020, the distribution area of S. alterniflora accounted for 26% of the estuary area. With the expansion of S. alterniflora, the areas of Phragmites australis and Suaeda salsa were decreased gradually, with arate of 0.72 and 0.39 km~2·a~(-1), respectively. In the typical tidal flat area of the Yellow River Estuary, the length and density of tidal creeks were decreased by 8.12 km and 0.24 km·km~(-2), respectively. The distribution area of P. australis and S. salsa, as well as the length and density of tidal creeks were significantly negatively correlated with the distribution area of S. alterniflora