胶带秤控制仪表的优化设计

针对影响电子胶带秤计量精度的主要因素问题,分析了控制仪表的设计方案,提出了一个高性能、低成本的电子胶带秤控制仪表的优化设计方案。具体地描述了仪表的输入通道、输出通道的优化设计方法,其中包括采用CPLD器件实现的测速环节,称重通道中有V/F变换器件实现的A/D转换的新算法。该A/D转换算法在保证A/D转换精度的前提下,提高了转换速率,使仪表的性能进一步提高,以适应高速、大运量的胶带输送机的物料计量和调节。     

Simulation of texture evolution and deformation mechanism in Mg-3Al-1Zn alloy during uniaxial compression

The effects of starting texture on he flow curves, and microstructure and texture evolutions of AZ31(Mg-3Al-1Zn-0.3Mn in wt.%) alloy during uniaxial compression at room temperature have been investigated by experiments and simulations. Two kinds of cylindrical compression samples were cut from the AZ31 extruded rod: one was cut with the compression direction parallel to the extruded direction(ED), and the other was cut with the compression axis perpendicular to the ED. The samples were termed as C//ED sample and C⊥ED sample, respectively. The results indicate that the general characteristics of flow curves and texture evolutions in both C⊥ED and C//ED samples during compression can be well explained by the relative activities of deformation mechanisms, which show a strong orientation dependence on the initial textures and the current texture. A significant yield behavior can be induced by {10-12} twinning at the starting deformation, and the lower yield stress in C⊥ED sample can be enhanced by the high activity of basal a slip. The work hardening behavior is related to the activities of basal slip, pyramidal c+a slip, {10-12} twinning, as well as {10-11} twinning. However, the activity of prismatic a slip is insensitive to the starting texture, and mostly negligible in all samples.     

新型氧化镧防雾剂的研究

介绍了一种新型氧化镧玻璃防雾剂的研制工艺，并将产品用紫外-可见分光光度仪和纳米粒度分析仪进行了表征。经试验验证该防雾剂可直接涂敷于汽车、家庭浴室镜面等玻璃表面，具有良好的分散性和附着性、防雾时间长、无毒、廉价等特点，而且使用方便，保存期长，同时对玻璃表面还有清洁作用。     

HMLS涤纶纤维及浸胶帘子布的应用特性

介绍了高模低缩（HMLS）涤纶纤维及其浸胶帘子布的性能,与普通涤纶相比,具有模量高、干热收缩率低、尺寸稳定性好等特点,适用于子午线轮胎的生产.     

基于GPS的线性尺寸计量认证技术研究

基于对新一代GPS（dimensional geometrical product specification and verification）线性尺寸规范及其数字化理论基础的分析,揭示并阐明新一代GPS线性尺寸规范以产品功能特征为中心、以“规范设计”与“计量认证”统一为原则、以计量数学为基础的规范思路及内在规律性;基于计量学和操作技术,给出线性尺寸计量认证中、实现实体计量系统与虚拟计量技术互补的思路与方法,并进一步建立其线性尺寸数字化计量认证的关键操作——拟合的数学描述及线性规划模型,开发出线性尺寸数字化计量认证（软件工具）系统;并在此基础上,进一步给出基于GPS数字化技术的虚拟综合量规设计与应用方法,以满足产品特定的功能要求;并通过实例说明其工程价值及技术经济意义。     

FH-98型催化剂在焦化汽油加氢精制中的应用

对FH-98型催化剂在中石油克拉玛依石化有限责任公司45×10~4 t/a焦化汽油加氢装置上不同工况的工业应用及催化剂实现长周期运行的优化措施进行了分析总结。结合行业同类装置催化剂运行情况进行对比,阐述了FH-98催化剂在焦化汽油加氢精制装置上实现较长周期运转的过程,拓宽了FH-98催化剂的应用范围及汽油加氢精制装置的催化剂选择,对同类装置具有一定的借鉴意义。     

PID-Fuzzy混合控制汽车主动悬架

建立了一个基于PID-Fuzzy混合控制的汽车主动悬架系统模型。该模型是一个四自由度的线性系统,受到了路面的不规则激励。主动控制是PID控制和模糊控制两种控制方法的叠加。PID控制使用车身的垂直加速度作为输入变量,模糊控制作为PID控制的补充,以车身旋转角加速度和旋转角速度作为输入变量。仿真结果显示文章提出的主动悬架系统对于车身的减振是非常有效的。     

CO2 reforming of methane on Ni/γ-Al2O3 catalyst prepared by dielectric barrier discharge hydrogen plasma

Ni/γ-Al₂O₃ catalyst was prepared by direct treatment of Ni(NO₃)₂/γ-Al₂O₃ precursor with dielectric barrier discharge (DBD) hydrogen plasma at different input powers, characterized by XRD, H₂-TPR, CO₂-TPD, N₂ adsorption and TEM, respectively, and used as the catalyst for CO₂ reforming of methane (CRM). The results showed that the input power obviously affected the reduction degree and catalytic performances of catalysts. Low input power under 40 W mainly resulted in the decomposition of nickel nitrate into Ni oxides. The reduction degree, catalytic activity and stability increase with the input power. Similar catalytic performances in CRM reaction can be obtained when the power exceeds 80 W. Compared with the Ni/Al₂O₃ catalyst prepared by traditional method, Ni/γ-Al₂O₃ samples prepared by H₂ DBD plasma exhibit better activities, stability and anti-carbon deposit performances. It is mainly ascribed to smaller Ni particle size, more basic sites and weaker basicity. The increase of Ni particle sizes due to the sintering at high temperature results in the decrease of catalytic activities and coke formation.     

一种基于嵌入式Linux的视频采集系统

介绍了以S3C2440A为处理器,Micro2440开发板为硬件平台,开发基于嵌入式Linux2.6.32.2操作系统的视频采集系统。该系统以USB摄像头为视频获取工具,通过V4L2编程接口实现摄像头捕获视频数据。实际运行表明,该视频采集系统画面显示稳定流畅、实时性好。     

Solar-driven high-efficiency remediation of wastewater containing small dye molecules

Science China Technological Sciences - Remediation of wastewater containing dye molecules is necessary to alleviate the significant threat that poses to human health and the environment. Current...