Study on the Bimetallic Doped Solid Acid Catalyst Cu/Ga2O3/SO42--ZrO2 for n-butane isomerization

随着环保法规的日益严格，大规模烷基化技术生产高辛烷值无硫汽油势在必行，而正丁烷异构产生的异丁烷正是此工艺的主要原料。因此，开展正构烷烃异构化催化剂的研究具有重要的现实意义与应用价值。工业上常用的非均相异构化催化剂通常由脱氢活性组分与酸性位两部分组成。其中，以硫酸氧锆固体酸（SO42--ZrO2）为载体的催化剂具有较高的活性与热稳定性，所以本论文通过制备SO42--ZrO2，并掺杂了非贵金属Ga对固体酸进行改性，考察了不同制备条件对正丁烷异构化的影响。 实验结果表明：等体积浸渍和共沉淀Ga均能抑制ZrO2的相变，延缓了由四方相转化为低活性的单斜相。Ga的最佳掺杂量为3-5wt.%，最佳焙烧温度...Increasingly stringent environmental regulations are accelerating improvements in alkylation technologies of isobutane with olefins to produce sulfur-free gasoline with a high octane number. The isobutane can be produced by n-butane isomerization. So, it is necessary to innovate and develop catalysts for modern science and alkanes isomerization in commercial applications. Most of these industrial ...学位：工学硕士院系专业：化学化工学院_工程硕士(化学工程)学号：2062014115140

区域经济一体化视角下的国际农产品贸易研究

目前多边贸易体系下的农产品贸易自由化谈判举步维艰,与此同时,各种区域经济一体化组织内部的农产品贸易自由化却在蓬勃发展,这主要是因为区域经济一体化对农产品贸易带来了贸易规模扩大、贸易条件改善、产品竞争力提高以及成员国农业政策协调容易等方面的好处。博士后科学基金(项目批准号:20070410800);; 湖北省科技厅攻关课题(项目批准号:2006AA412C04);; 湖北省高等学校人文社会科学重点研究基地——WTO与湖北发展研究中心研究项目(项目批准号:W200611)的资

Preparation and Application of CaCu3Ti4O12 Based Ceramics with Dual-functional Properties

本论文采用固相法制备CaCu3Ti4O12（以下简称CCTO）粉体，研究了添加剂含量及烧结方法等因素对CCTO陶瓷致密度、微观结构及电气性能等方面的影响。 选取V2O5为单一添加剂，Bi2O3-CuO为复合添加剂，实验结果表明：当V2O5的添加量为0.1%时，陶瓷形成一种大小晶粒交错堆叠的致密结构（ρ=95.97%），CCTO陶瓷的介电性能表现出较好的频率稳定性和温度稳定性，f=1kHz时εr=32038且tanδ=0.026，CCTO陶瓷的正反向非线性系数均大于10；固定V2O5的添加量，采用两步法烧结有助于提高陶瓷的压敏性能:当T2=1020ºC时，ρ=97.59%，CCTO陶...In this thesis, CaCu3Ti4O12（CCTO）ceramics were prepared by the conventional solid state reaction. The effects of sintering conditions and amount of different dopants on chemical structure, dielectric properties and J-E response of the sample were studied. V2O5 and Bi2O3-CuO were chosen as single and double additives, respectively. The results shown that the large grain was evenly distributed acro...学位：工学硕士院系专业：材料学院材料科学与工程系_材料学学号：2072008115059

服务贸易自由化:多边主义VS区域主义——一个新政治经济学的分析视角

本文基于新政治经济学的分析视角,在对服务贸易自由化影响因素进行系统分析的基础上,就多边和区域服务贸易自由化的进展现状以及二者的关系进行了探讨。研究发现由于国内与国际层面利益集团的多重作用,使得gATS与区域层面的服务贸易自由化成效存在一定的差异。本文认为只有区域和多边经贸关系的协调发展,才能使中国在不同经贸利益需求条件下,灵活而合理地选择运用不同层面的策略工具。国家社科基金2007年重点项目(07JJD790142);教育部人文社会科学重点研究基地2007年度重大项目(07AJL016);国家博士后基金项目(20070410800);教育部人文社会科学研究一般项目(08JA790132)的阶段性研究成

中国における小売企業の物流発展対策に関する一考察

According to the promise of China when entering into the WTO, in December, 2004 Chinese government repealed the restriction on capital contributed by foreign company, the amount of foreign companies and the area they can choose in logistic industry. Besides that in foreign trade and chain deal area some kind of restriction has also been repealed and mitigated. With this chance Wal-Mart and Carrefour and other foreign retailers began their business activities in China formally. The domestic retailer represented by Lianhua Supermarket and Wumei Supermarket Appliance Chain also began their fast spread. In this fierce competitive environment the retail industry\u27s profit rate decreased in a deep degree. How to make use of modern logistic technology to reduce logistic cost become the key of assuring retail industry\u27s profit. This paper firstly points out that the modern logistics develops in our country is not mature and has many problems through the analysis of Chinese retail logistics statuses. Then it analyzes the problems which exists in the domestic retail has carried on the analysis, and based on this proposes the countermeasures to develops the domestic retail

CEPA框架下的鄂港经贸合作研究

一、鄂港经贸合作的现状鄂港两地交往的历史极为悠久,在香港陆续出土的一些古代陶器文物中,就有不少来自荆楚江汉地区,展现出一条从湖北到香港的历史文化联系纽带。湖北省科技厅攻关课题(项目批准号:2006AA412C04);; 湖北省教育厅社科研究重点立项课题(“以CEPA为契机,加快湖北服务业的发展研究”);; 湖北省高等学校人文社会科学重点研究基地WTO与湖北发展研究中心研究项目(项目批准号:W200611,W200613)的资助

中国新一轮企业所得税改革:一个公司治理的视角

税制总是随着所处的政治、经济、文化、技术环境的变化而不断优化和调整。2003年10月,中国启动了新一轮税制改革。本文在对税收与公司治理结构相关研究进行综述的基础上,从改善中国公司治理结构的视角,指出中国新一轮企业所得税改革需要关注的几个问题。湖北省科技厅引导项目(项目批准号:2006AA412C05

Application of Ground LiDAR for The Investigation of Outcrop Discontinuities and Estimation of Associated Engineering Characteristics

Reliable and direct information about rock slope materials and discontinuity parameters from field investigation are keys to engineering design, structure maintenance and soil/water conservation. Under the impact of global climate change and the surge in extreme weather events, rapid and accurate equipment or procedures for geological engineering surveys are necessary to harmonize engineering facilities with natural environment. This study utilizes 3D laser scanning technology (also known as ground LiDAR), which obtains the coordinates of surface geometry rapidly in point clouds, to survey two outcrops. Applying ground LiDAR in a geological survey, we compare the results with those provided by the International Society of Rock Mechanics, and analyze the slope stability. This study also discusses the applicability and limitations of ground LiDAR technology in discontinuity investigation and estimation of rock mass engineering characteristics. Suggested operating procedures for the use of ground LiDAR technology in outcrop surveys are provided accordingly. The results show that ground LiDAR technology reduces the in-situ operation time significantly, thus facilitating efficient discontinuity surveys and outcrop parameters evaluation. However, the quantities of office work and the accuracy of point clouds depend on the velocity and accuracy of ground LiDAR surveys. Therefore, inspection of survey results and output parameter, along with the application and operating specifications of geological surveys, including point cloud resolution, reasonable error of superimposition, inspection procedures and data analysis, still await further research.岩石工程道路邊坡經現地調查獲得可靠、直接的岩石材料種類與不連續面參數，為確保工程設計施工、設施營運維護及環境水土保持之關鍵資訊。在近年全球氣候變遷與極端氣候事件規模與頻率加大的衝擊下，迅速、精準的工程地質調查工具與作業方法，為落實工程設施與自然環境永續發展的不二法門。本研究利用三維雷射掃描技術 (又稱光達技術，|iDAR)，運用其可快速取得露頭表面幾何坐標描述點雲的特性，透過2處露頭現地地質調查，探討地面光達在工址地質調查之應用，並比較國際岩石力學學會建議工址現地調查作業方法所獲得的參數，分析評估邊坡的穩定特性，據以提出地面光達應用於露頭不連續面調查與岩體工程特性評估的適用性與限制，並提出地面光達應用於露頭調查的作業程序。研究結果顯示，地面光達技術可大幅縮減現地調查作業時間，為露頭不連續面調查與參數評估的新利器，由於室內分析工作量和點雲的精度決定了|iDAR應用於露頭不連續面調查的速度與精準度，未來針對調查成果與產出參數的檢核、在地質調查的應用與作業規範，包括點雲解析度、疊合容許誤差以及資料分析與檢核程序等，有待進一步深入研究

欧盟区域税收协调对中国——东盟自由贸易区构建的启示

区域贸易协定(RTA)的目标旨在消除成员间阻碍商品、服务和生产要素自由流通的各种障碍,以实现区域内各国福利的最大化。从宏观经济层面湖北省科技厅攻关课题(项目批准号:2006AA412C04);; 教育部2005年度人文社科规划基金项目(项目批准号:05JA790094);; 湖北省高等学校人文社会科学重点研究基地WTO与湖北发展研究中心研究项目(项目批准号:W200611)的资

区域主义与多边主义:共存或冲突?——一个政治经济方法的分析视角

本文从政治经济的分析视角深层次探讨区域主义与多边主义的内在联系,同时结合中国目前的国内外环境,指出区域经济一体化是中国经济对外开放的合理选择,次区域的甚至是双边的区域经济一体化形式是中国当前区域经济一体化决策的最优选择