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光学扫描法测金属杆直径
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作者 李美莹 刘凯 李金环 《大学物理实验》 2015年第4期63-65,共3页
研究利用光学扫描法测量金属杆直径。研究根据菲涅尔直边衍射原理获得金属杆衍射光强分布,使用光电池与检流计监测光强分布,利用计算机绘制衍射图像得到待测金属杆的直径(1 cm左右)。
关键词 光学扫描法 菲涅尔直边衍射 直径测量
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激光检测传感器的设计与研究
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作者 宋开宏 《安徽建筑工业学院学报(自然科学版)》 2003年第2期44-47,共4页
根据物料的光学特性和色度特性,采用激光技术和计算机处理技术,设计一种通过光学扫描法来实现检测杂质的传感器,实验证明所设计的传感器完全可以满足实际使用的要求,结果令人满意。
关键词 激光 检测 传感器 光学扫描法 色度
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飞秒脉冲非对称互相关绝对测距 被引量:4
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作者 彭博 曲兴华 +4 位作者 张福民 张天宇 张铁犁 刘晓旭 谢阳 《物理学报》 SCIE EI CAS CSCD 北大核心 2018年第21期82-87,共6页
光学频率梳是一种重复频率与偏置频率锁定的新型光源,在频域上为频率间隔稳定的频率梳齿,在时域上为相对距离稳定的飞秒脉冲激光.光学频率梳在测距中的应用广泛,能够实现远距离高精度的测量.本实验使用飞秒激光脉冲作为光源,基于谐振腔... 光学频率梳是一种重复频率与偏置频率锁定的新型光源,在频域上为频率间隔稳定的频率梳齿,在时域上为相对距离稳定的飞秒脉冲激光.光学频率梳在测距中的应用广泛,能够实现远距离高精度的测量.本实验使用飞秒激光脉冲作为光源,基于谐振腔扫描光学采样测距原理得到非对称的互相关干涉条纹,实现了远距离高精度的绝对测距.非对称互相关条纹可通过色散补偿与调节光学频率梳的重复频率得到,并通过得到的非对称的互相关干涉条纹对测距结果进行补偿.实验结果表明测距系统能够实现在50 m范围内误差为2μm的绝对测距,测量相对误差为1.9×10^(-7). 展开更多
关键词 光学频率梳 绝对测距 谐振腔扫描光学采样 非对称互相关
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Photocatalytic activity of bauxite-tailings supported nano-TiO_2
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作者 卢清华 胡岳华 王梦 《Journal of Central South University》 SCIE EI CAS 2010年第4期755-759,共5页
TiO2/bauxite-tailings (TiO2/BTs) composites were prepared via a chemical liquid deposition method and characterized by X-ray diffractometry (XRD), scanning electronic microscopy (SEM) and N2 adsorption analysis.... TiO2/bauxite-tailings (TiO2/BTs) composites were prepared via a chemical liquid deposition method and characterized by X-ray diffractometry (XRD), scanning electronic microscopy (SEM) and N2 adsorption analysis. The photocatalytic performance of TiO2/BTs composites was evaluated with UV-Vis spectrophotometer following the changes of phenol concentration under different illumination time. Effects of the calcination temperature, the pH and the cycles on the photocatalytic activity of TiO2/BTs composites were investigated. The composites calcined at 500 and 600 ℃ exhibit the best photocatalytic performance, and the phenol degradation ratios reacting for 40 and 160 rain reach 35% and 78% respectively under the same conditions, higher than those of 29% and 76% of the Degussa P25(TiO2). The ability of TiO2/BTs500 (BTs500 represents bauxite-tailings calcined at 500 ℃) composites to degrade phenol increases with decreasing pH. 展开更多
关键词 TIO2 bauxite-tailings PHENOL photocatalytic activity
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Characterization and Desulfurization Possibilities of High Sulfur Gediz-Turkey Coal
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作者 Ugur Demir 《Journal of Environmental Science and Engineering(A)》 2017年第1期31-38,共8页
Coal is one of the important energy sources, but it causes serious environmental problems such as air pollution, acid rain and greenhouse effects. Sulfur in coal is one of the responsibilities of these negative effect... Coal is one of the important energy sources, but it causes serious environmental problems such as air pollution, acid rain and greenhouse effects. Sulfur in coal is one of the responsibilities of these negative effects. Coal includes two types of sulfur: organic and inorganic. While inorganic sulfur can be completely removed with physical desulfurization methods, organic sulfur can be removed only by chemical desulfurization methods. But chemical methods are not only expensive but also difficult processes. Firstly in desulfurization, types of the sulfur content in coal should be well characterized. High sulfur Gediz-Turkey coal has been chosen to this study. This coal basin is located in the centre of the Turkey. In this study, characterization and desulfurization possibilities of high sulfur Gediz coal were investigated. For this purpose, several physical and chemical characterization methods such as proximate and ultimate coal analysis (ash, calorific value, volatile matter, moisture and sulfur analysis), mineralogical and petrographic analysis, fourier transform infrared spectroscopy, scanning electron microscope were used. Results of these analysis are shown that Gediz coals include 3.15% pyritic sulfur and 2.89% organic sulfur. Removing pyritic sulfur from Gediz-Turkey coal with physical methods such as gravity and sink-float separation is not possible because pyrite particle has 1-2 micron liberation size in coal. 展开更多
关键词 CHARACTERIZATION DESULFURIZATION high sulfur Gediz coal.
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微针对白脉软膏经皮渗透性及应用安全性研究 被引量:1
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作者 肖五庆 梁军 +7 位作者 竺楹银 刘凯列 钟宛凌 杨天姿 席铖 胡晓红 武慧超 杜守颖 《中草药》 CAS CSCD 北大核心 2023年第6期1766-1774,共9页
目的为改善白脉软膏经皮渗透性,采用微针技术进行促透,考察其对白脉软膏经皮渗透性和应用安全性的影响,以筛选安全、有效的微针应用条件。方法以小鼠腹皮作为实验材料,采用改良的Franz扩散池进行体外渗透性评价,计算不同微针条件下白脉... 目的为改善白脉软膏经皮渗透性,采用微针技术进行促透,考察其对白脉软膏经皮渗透性和应用安全性的影响,以筛选安全、有效的微针应用条件。方法以小鼠腹皮作为实验材料,采用改良的Franz扩散池进行体外渗透性评价,计算不同微针条件下白脉软膏3个主要成分甘草酸铵、甘松新酮、姜黄素的24 h累积经皮渗透量及稳态透皮速率,评估促透性能;采用光学相干断层扫描法(optical coherence tomography,OCT)记录微针处理后0、10、20、30、40、50、60、90、120min时的微孔道深度,进而对皮肤损伤及恢复程度进行量化评分,作为安全性评价依据。综合体外渗透性、皮肤损伤及恢复程度为评分指标(权重分别占40%、30%、30%),运用正交试验设计将微针长度、作用力度和作用时间作为考察因素进行条件优化,筛选适宜的微针条件。结果3个因素对综合评分的影响大小为微针长度>作用时间>作用力度,最终筛选出的微针条件为微针长度250μm、作用力度5 N、作用时间5 min。结论综合考虑了微针对白脉软膏体外渗透性、皮肤损伤及恢复程度的影响,为白脉软膏及微针促透的临床合理安全应用提供理论参考。 展开更多
关键词 白脉软膏 微针 经皮渗透 光学相干断层扫描 综合评价 甘草酸铵 甘松新酮 姜黄素
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