铝基体上氧化铝／二氧化钛复合膜的形貌和结构研究

二氧化钛是一类具有高光催化活性的功能性材料，在能源、环保、卫生保健等领域有着重要的应用价值．利用阳极氧化和电沉积的方法在铝基体上制备了氧化铝／二氧化钛复合膜，通过XRD、TG／DSC、SEM、EDS、XPS等分析手段对复合膜的形貌和结构进行了表征，并对复合膜的形成过程予以阐述．结果表明，电沉积得到的TiO2为非晶态，随热处理温度的升高，TiO2向晶态转变。热分析结果确定TiO2由无定型结构向锐钛矿结构转变的温度约为425℃。TiO2分布于氧化铝膜的表面及微孔内部，随电沉积时间的增加，TiO2的含量增大，复合膜表面趋于出现裂纹缺陷。复合膜表面主要由Ti、O两种元素构成，同时存在较少量的Al、S、K等元素，其中Ti元素全部以TiO2的形式存在．铝阳极氧化膜表面的TiO2是通过交流电沉积过程中的阴极反应生成并沉积于氧化铝的表面及微孔内部，随沉积时间的延长，放电通道和氧化铝膜的溶解作用加剧，复合膜表面将呈现网状裂纹形貌。     

全彩显示屏专用LED的选择和使用

本文介绍了全彩LED显示屏关键部件——LED的选择和使用,总结了全彩显示屏专用LED的几项关键指标,对控制和提高LED全彩显示屏的质量有指导意义。     

核电乏燃料贮存用中子吸收材料的发展及趋势

对常用的核电厂乏燃料贮存用中子吸收材料以及相应的乏燃料贮存格架结构形式进行了讨论,按照HAF102的要求提出了一种新型乏燃料贮存格架结构设计,并据此讨论了中子吸收材料的发展方向与实现路径,提出了后续中子吸收材料的研发思路。     

Acceleration-level repetitive motion planning of redundant planar robots solved by a simplified LVI-based primal-dual neural network

In this paper, we propose a novel repetitive motion planning (RMP) scheme at the joint-acceleration level (termed, the acceleration-level RMP scheme, the ARMP scheme), which incorporates joint-angle limits, joint-velocity limits and joint-acceleration limits. To do this, Zhang et al's neural-dynamic method is employed to derive and design such an ARMP scheme. Such a scheme is then reformulated as a quadratic program (QP). To solve this QP problem online, a simplified linear-variational-inequality based primal-dual neural network (i.e., S-LVI-PDNN) is designed. With simple piecewise-linear dynamics and global exponential convergence to the optimal solution, such an S-LVI-PDNN solver can handle the strictly convex QP problem in an inverse-free manner. Finally, three given tasks, i.e., rhombic path, straight-line path and square path tracking tasks, are fulfilled by three-link, four-link and five-link planar robot arms, respectively. Computer-simulation and physical experiment results validate the physical realizability, efficacy and accuracy of the ARMP scheme and the corresponding S-LVI-PDNN solver.     

基于信号完整性分析的TPM芯片设计

由于可信计算平台自身的设计原理及机制上的缺陷,其在面对物理攻击时很难有效地保护整个平台系统的安全性,而基于信号完整性分析的TPM芯片设计思想已给出了较好的解决方案.在上述研究工作的基础上,进一步提出了逻辑分层的TPM-APM（TPM-analog parameter measurement）子模块改进设计方案.通过对时延模拟参数的度量,给出了TPM芯片中TPM-APM子模块的工程实现方法,并使用眼图比对法,为TPM-APM子模块实现的可行性进行了验证.分析结果表明,引入改进设计的TPM-APM子模块可增强可信计算平台面对物理攻击时的防御能力.     

智能视频分析技术在综合安防系统中的应用

为了满足不断提升的地铁综合安防系统的运营管理要求,结合了某市大型地铁项目,对目前数字视频监控系统中采用的视频分析技术进行了分析,指出了这种技术在当前应用中的不足,提出了改进策略,通过把相关设备深度集成到监控系统中来,使视频分析系统更加智能化的同时提高了监控系统的精确度和整体可控度.详细介绍了智能视频分析系统的设计思想和...     

剂量和稳定剂对SBR／SBS改性沥青性能的影响

通过多种性能评价方法，考察了SBR剂量以及添加稳定剂对SBR／SBS改性沥青性能的影响。试验结果表明，SBR剂量超过4%导致沥青离析。加入稳定剂使聚合物产生交联，导致SBR／SBS改性沥青的延度降低、粘韧性和抗变形能力提高。     

Microwave dewaxing applied to the investment casting process

Autoclave processing is commonly used nowadays for dewaxing in the investment casting process. However, since the use of microwave is steadily growing in industrial processes and the wax interacts with the electromagnetic energy of the microwaves, the present work studies the possibility of carrying out dewaxing via microwave. The wax (mineral wax, vegetable resin, low molecular-weight polymer and anti-oxidant) used in this work was prepared by melting in an oven equipped with a mineral oil bath. The chemical and structural stability of the wax were monitored throughout 12 simulated dewaxing cycles, via various analyses, namely, volumetric expansion, hardness, Fourier transform infrared spectroscopy, ultraviolet–visible spectrophotometry, differential scanning calorimetry and viscosity. The results showed that microwave dewaxing is viable, significantly decreasing the incorporation of dirt and water, which is inevitable in the autoclave dewaxing process.     

高压电路防污闪带电清洗维护技术可行性研究

比较全面地论述了带电清洗中的高压带电清洗剂、高压带电清洗工具、高压带电施工工艺和高压带电安全措施等内容。     

Modeling of material removal rate in electric discharge grinding process

The mechanism of material removal in electric discharge grinding (EDG) is very complex due to interdependence of mechanical and thermal energies responsible for material removal. Therefore, on the basis of conceived process physics for material removal, an attempt has been made to predict the material removal rate (MRR). The proposed mathematical model is based on the fundamental principles of material removal in electric discharge machining (EDM) and conventional grinding processes. The inter-dependence of the thermal and mechanical phenomena has been realized by scanning electron microscopy (SEM) characterization of the samples machined at different processing conditions. The key input process parameters like pulse on time, pulse current, gap voltage, duty cycle, pulse off time, frequency, depth of cut, wheel speed and table speed are co-related with MRR for three distinct idealized processing conditions. The constant showing the extent of interdependence of two phenomena were evaluated by experimental data. The obtained expressions of MRR have been validated for processing conditions other than those used for obtaining constants. It was found that the discharge energy plays prominent role in material removal. The percentage difference in experimental findings and theoretical predictions was found to be less than 3%.