基于MATLAB的动态规划在热连轧板形板厚协调控制中的应用

针对板形控制技术在板带材生产过程中所起到的重要作用,分析研究了解析板形刚度理论,提出了一种对热连轧轧制规程优化的新思路.在结合新型板形测控模型研究的基础上,给出了可用动态规划进行优化的数学模型,并采用动态规划逆序算法得到了使得目标函数达到最小和最优状态变量的板凸度与平直度.整个优化过程通过调整压下量的大小而实现了对板厚的微调,优化结果也基本达到了板形、板厚协调控制的目的.     

仙人掌中抑菌活性成分的提取与分析

采用响应面分析法得出仙人掌抑菌活性成分的最佳提取工艺条件为:乙醇体积分数76.96%,料液比1∶29.92,浸提温度69.40℃,浸提时间5.19 h.对仙人掌提取物做了抗菌谱的测定,结果表明,具有较宽的抗菌谱.仙人掌提取物对金黄色葡萄球菌、大肠杆菌、根霉、青霉和酿酒酵母的MIC分别为6.25 g/L、3.125 g/L、6.25 g/L、12.5 g/L和25 g/L.对仙人掌提取物进行稳定性测试,结果表明仙人掌提取物的抑菌活性具有较好的热稳定性、对紫外光照射稳定,pH4～6范围内抑菌效果稳定.     

文物景观的三维数字化方法研究

开发利用文物景观的同时,必须采取有效方式进行保护和修复,并对其档案信息永久保存.以大型文物景观数字化保护为目的,提出将GPS、全站仪等单点测量方式与三维激光扫描技术相结合,以局域控制的方式将景观模型纳入空间坐标系统,研究其分布和演化规律;利用三维激光扫描仪获取文物景观的全方位空间信息,建立可量测的三维可视化模型和二维线划模型.将其用于中山纪念馆的数字化工程,证明了该方法的有效性.     

遥感地质解译及矿化蚀变信息提取在矿产资源评价中的应用研究

选取Landsat7ETM+和ASTER为遥感信息提取的数据源,基于ETM+数据进行信息提取,结合ASTER数据处理结果进行对比验证,对非洲某铜矿勘查区进行遥感资源评价.通过遥感影像预处理、地质解译标志建立、影像目视解译获取区内岩性与构造解译图、遥感蚀变信息的提取、圈定找矿靶区等步骤,预测了3个成矿远景区,为后续找矿奠定了基础.     

一种基于P2P网支持QoS的语义Web服务的匹配模型*

如何准确而又高效地匹配零散分布于各地的Web服务,通过分析现有的一些相关研究,在P2P网络的基础上提出了支持QoS的语义Web服务匹配模型。模型首先分析了P2P网络的特点,在扩展UDDI的基础上,结合目前语义Web服务匹配的多层匹配思想,提出一个三层次的匹配筛选算法,并对基本描述、语义Web服务匹配、服务质量各层的匹配算法进行了深入讨论,用相似函数来度量服务提供方与服务请求方的Web服务相似程度,为Web服务匹配和发现提供了一种有效的方法。     

银行监管有效性体系的建构

为提升我国银行监管的有效性,在借鉴国际社会银行监管经验的基础上,采用比较分析的方法,构建适合我国国情的银行监管有效性指标体系．利用该指标体系对我国银行监管现状进行分析,结果表明,我国银行监管收益指标中的稳定性指标比较理想,但存款人保护等指标仍有较大提升空间．银行监管成本高,即银行监管应在提高各项收益指标的前提下,尽可能削减监管成本．     

Preparation of lactic acid from glucose in ionic liquid solvent system

A new reaction system was designed to economically convert glucose to lactic acid environment-friendly. Hydrophobic ionic liquids were chosen as solvent that can promote the decomposition reaction of glucose, and the catalytic performance of the solid bases was evaluated. Both the reaction temperature and time can affect the yield of lactic acid. A high yield (97%) of lactic acid was achieved under the optimal reaction condition. The 1H NMR spectra and HPLC-MS were used to identify the formation of the lact...     

Enhancing diamond drilling performance by the addition of non-ionic polymer to the flushing media

Drilling is a most important and crucial operation in the excavation industries.With the objective of looking into the enhancement of diamond drilling performance detailed laboratory investigations were carried out on phosphate rock.The effect of Poly (Ethylene Oxide) (PEO) added to the drilling water was studied by varying machine parameters and PEO concentration.The responses were rate of penetration and torque at the bit rock interface.Slake durability tests were also performed to understand the slaking behavior of phosphate rock in PEO solutions.     

基于CAFE法的单晶铜杆热型连铸过程晶体生长模拟

基于元胞自动机(CA)和有限元(FE)耦合法对单晶铜杆热型连铸过程中晶粒生长及演化过程进行了模拟,获得了稳定状态下铸棒内温度分布及液固相界面的位置和形态,模拟了连铸初期沿热流方向细小等轴晶快速合并形成柱状晶的过程,采用截面形态和极图法分析了定向凝固条件下各个生长时刻的晶粒形貌和晶粒生长取向以及晶粒竞争生长过程中的快速淘汰和慢速淘汰阶段,为热型连铸工艺优化提供了依据。     

Microscopic characterization of semi-solid aluminium alloys

The microstructural evolution and element distribution of the Al-4Cu-Mg alloy during semi-solid compression were investigated,and the precipitate behavior and dislocation morphology were discussed.The experimental results show that the microstructure,the number of CuAl2(θ phase) precipitates,and the dislocation density of the Al-4Cu-Mg alloy depend apparently on the process parameters.More segregation of Cu at the grain boundary happens with an increase of deformation temperature and a decrease of strain ra...