氮掺杂TiO_2水热法制备及其光催化活性的研究

以钛酸四丁酯、尿素、无水乙醇为原料,采用水热合成方法制备了掺氮和不掺氮的二氧化钛前驱体。以250W高压汞灯为光源,达旦黄水溶液为活性评价体系,设计正交表研究了N-TiO2光催化实验的最佳条件。研究了N-TiO2对不同拟污染物的降解能力,分析了可见光条件下N-TiO2和TiO2光催化活性。     

毛细管区带电泳在生物农药残留分析中的应用

毛细管电泳(CE)具有所需样品量小、分离效率高等特点,已经引起越来越多的关注,并将它应用到农药残留的检测中。对目前的多种检测方法的优缺点及其在农药残留检测中的应用情况进行了综述,同时介绍了生物农药的毛细管区带电泳(CZE)的检测情况,展望了CZE在农药残留分析与检测中的应用前景。     

再生丝素蛋白/羟基磷灰石多孔复合材料的制备

再生丝素蛋白具有良好的生物相容性,羟基磷灰石同时还具有成骨诱导性。通过将再生丝素蛋白制备形成丝素蛋白多孔材料,并在37℃下将其浸渍于模拟体液中可以制备再生丝素蛋白/羟基磷灰石多孔复合材料。扫描电镜研究发现在再生丝素蛋白多孔材料的孔隙中羟基磷灰石由针状晶体聚集而成,红外光谱和XRD等表征表明复合材料中羟基磷灰石以羰基取代的羟基磷灰石存在。制备的再生丝素蛋白/羟基磷灰石多孔材料有望作为骨组织修复材料使用。     

Ag/Co/Au三金属纳米粒子的合成及表征

反胶束是指由介于油和水界面的表面活性剂分子来稳定的,且均匀分散于连续油介质中的微液滴,由于微液滴的尺寸限制和其在油介质中的良好分散性,它可以作为"微反应器"合成纳米材料。以AOT为阴离子表面活性剂,采用反胶束法合成了Ag/Co/Au纳米粒子。采用紫外-可见(UV-Vis)吸收光谱、傅立叶红外光谱(FT-IR)对产物进行表征。研究结果表明,反胶束法合成Ag/Co/Au纳米粒子粒径均匀,分散性好、稳定性好。     

基于FPGA的32位除法器设计

介绍了一种使用可编程逻辑器件FPGA和VHDL语言实现32位除法器的设计方法。该除法器不仅可以实现有符号数运算,也可以实现无符号数的运算。除法器采用节省FPGA逻辑资源的时序方式设计,主要由移位、比较和减法三种操作构成。由于优化了程序结构,因此程序浅显易懂,算法简单,不需要分层次分模块进行。并使用Altera公司的QuartusⅡ软件对该除法器进行编译、仿真,得到了完全正确的结果。     

Analytical performance of soft clustering protocols

The success of a mobile ad hoc network (MANET) is strongly related to the protocol used at the medium access control (MAC) layer. Depending on the requirements and the specific network under concern, the protocol parameters at the MAC layer can be arbitrated to make best use of the channel resources. Typically, extensive simulation studies are used to find the best values for these variables. The problem with this approach is the need for excessive amounts of processing power and time. As the dimensions of the decision space increase, the need for processing power grows exponentially. This paper addresses this problem by developing an analytical model that reflects the relationships between protocol parameters and the overall performance of the protocol under various network conditions. Specifically, we model the MH-TRACE cluster-based protocol, which is capable of supporting real-time data transmission. The model is capable of estimating performance measures such as energy consumption and number of receptions while being simple enough to be run for a large set of parameters. The model can be used to optimize parameters of the protocol (such as the number of frames per superframe) as well as to predict the performance variations as the external conditions (such as data generation rate) vary.     

浅谈DCS化工仿真教学

讨论了DCS化工仿真实习系统在教学中的应用及培训方法。实践结果表明：仿真训练对学生了解化工过程的工艺和控制系统的动态特性,提高对工艺过程的运行和控制能力以及学生的安全教育具有良好的效果。     

Application of a thin intermediate cathode layer prepared by inkjet printing for SOFCs

The application of an inkjet printing process for fabricating solid oxide fuel cell (SOFC) cathodes was investigated. Stably-dispersed LSCF–GDC inks were prepared by ball milling, and the composition was easily controlled by the preparation process. Fabrication of an LSCF–GDC layer was successfully carried out by depositing dots and the thickness was easily controlled by repeating printing process. A planar SOFC single cell with a double-layered cathode (comprised of a paste painted cathode layer and an inkjet printed interlayer) achieved a maximum power density of 0.71 W/cm² at 600 °C. This is the preliminary work for fabricating the cathode layer of a SOFC single cell via inkjet printing.     

On the inference of semi-coherent structures from data

In this paper, we consider an unknown semi-coherent structure function. Our main focus is the inductive inference problem, that is, how to learn the structure function from data which partially defines the function. We develop a set of algorithms and simulate their success in learning an arbitrary 10-component function, and conclude that the algorithms are feasible.     

一种结合阴影补偿的城市高分遥感影像分割方法

随着遥感影像空间分辨率的不断提高,由于阴影导致的弱边缘及虚假边缘等对于准确定位对象边缘所造成的干扰也更加突出。在传统的影像分割中进一步引入阴影补偿策略,在之前所提出的WJSEG算法基础上,通过将阴影视为出界点并利用卡方变换进行阴影识别,提出了一种结合阴影补偿的城市场景高分辨率遥感影像分割算法SWJSEG。实验表明,该方法能够有效应对阴影造成的干扰,有助于更加准确地定位对象边缘,使影像分割的精度及可靠性显著提高。