梯度折射率激光准直器的原理与设计

本文研究用单块抛理型梯度折射率棒透镜作激光准直器的原理、特性和设计。     

光纤气体传感系统背景噪声的滤除

在光纤气体传感系统中,为提高检测的灵敏度,需要采取措施抑制系统的各类噪声。通过设计低噪声的前置放大器和光源驱动电路可有效地降低系统的噪声;但对于因光路变化和光在传输过程中偏振态发生变化引起的背景噪声的处理一直是光纤气体传感系统测量灵敏度提高的难点。提出一种基于最小二乘拟合的背景噪声滤除算法。利用参考光栅和法布里-珀罗标准具实现对输出信号的光谱重建。在此基础上,利用气体特征吸收峰两边的输出拟合整个输出曲线。将系统的输出与拟合曲线相除,实现系统输出的归一化,有效地滤除了系统的背景噪声,避免了当传感系统背景噪声发生变化时,需要重新采集背景气的繁琐工作,为测量带来方便。     

摇铃状Fe_3O_4@C复合材料的结构表征及其储锂性能研究

本文采用简易湿化学法制备新颖的摇铃状Fe3O4@C纳米复合材料。利用X射线衍射仪(XRD)和透射电子显微镜(TEM)技术对其形貌、成分及微观结构进行表征,并对复合材料进行电池性能测试。结果表明,由于Fe3O4@C纳米复合材料独特的摇铃状结构,其作为锂离子电池负极表现出良好的电化学性能,具有良好的循环稳定性和较高的比容量。     

不同温度下半导体硅势垒的正向I-V特性曲线的汇聚特性

以正向电压为自变量,以正向电流的对数为应变量,以温度为参数得到的p-n结的I-V-(T)特性曲线在第一象限中近似汇聚于一点.汇聚点对应的电压近似等于半导体材料的禁带宽度.汇聚点可以用来获取任意温度下的I-V特性曲线.     

Logix5000及Powerflex70在自动配煤控制系统上的应用

介绍了Logix5000及Powerflex70在济南钢铁股份有限公司焦化厂自动配煤中的应用,重点介绍了36台Powerflex70,Logix5000、Powerflex70通讯采用了双冗余的ControlNet可靠通讯方式.     

计算机网络控制系统在济钢焦化厂生产监控中的应用

0 引言 济南钢铁集团总公司焦化厂(以下简称济钢焦化厂)主要生产工序有备煤、炼焦、干熄焦、回收、大焦油,各监控系统互相独立,不能进行集中监控.根据各工序的工作特点及焦化厂应用系统对网络设计的要求,实现集中监控、建设集中控制室势在必行.     

Highly efficient synthesis of Fe-containing mesoporous materials by using semi-fluorinated surfactant and their high activities in Friedel–Crafts alkylations

Fe-containing mesoporous materials (Fe-JLU-15) with various Si/Fe ratios (47–112) have been successfully synthesized by using semi-fluorinated surfactant of FSO-100 as a template. XRD, N₂ isotherm, and TEM techniques indicate that these samples have worm-like mesostructure with uniform pore size. UV–vis and ESR spectra suggest that Fe species in Fe-JLU-15 are mainly tetrahedrally coordinated. Interestingly, compared with Fe-SBA-15, the efficiency of incorporation of Fe species into Fe-JLU-15 is relatively high. Very importantly, catalytic data in benzylation of aromatic compounds such as benzene, toluene, and ethylbenzene with benzyl chloride shows that Fe-JLU-15 samples are very active and recycle catalysts.     

Dependence of zeolite topology on alkane diffusion inside diverse channels

Zeolites have been widely used for the processes of adsorption, separation, and catalysis, which are strongly correlated with molecular diffusion. However, the correlation between pore dimension and diffusion properties has not been systematically investigated so far. In this work, the diffusion properties of alkanes in six zeolites with similar pore sizes but different pore dimension have been examined. It is found that the diffusion coefficients of alkanes in zeolites are 2–5 orders of magnitude smaller than that in gas phase. Moreover, the diffusion of alkanes inside zeolites is sensitive to the pore dimension, and can be differentiated by 1-D straight, 1-D tortuous, and 3-D intersecting channels, based on the derived quantitative correlation between the diffusion behavior and pore dimension. Our work may not only provide deep insights into the effects of pore dimension on diffusion, but also benefits for the future design and practical applications of zeolite catalysts.     

钢衬聚四氟乙烯设备的加工、设计与应用

介绍了钢衬聚四氟乙烯设备的加工方法,设计中需要注意的问题,以及在湿氟、湿氯环境下的使用情况。