清代绿色蟠龙邮票印刷材料无损分析

利用超景深三维视频显微镜, 激光显微共聚焦拉曼光谱仪和扫描电镜-能谱仪对一张清代绿色蟠龙邮票样品的纸张, 油墨等印刷材料进行无损分析。结果表明,该样票采用手工雕刻凹版印刷,所用承印物为长纤维机制纸,未经过涂布, 无水印, 背胶;纸张填料中含有Al, Si等元素,推断纸张填料可能是高岭土(Al₂O₃·2SiO₂·2H₂O)之类的物质。绿色油墨包含了蓝色普鲁士蓝(Prussian Blue,Fe₄[Fe(CN)₆]₃·14-16H₂O)和黄色铬酸铅[Lead(Ⅱ) chromate,PbCrO₄]颜料,根据印刷色彩学色料减色和色光加色理论分析,邮票样品呈现的绿色是由蓝色颜料普鲁士蓝和黄色颜料铬酸铅混合呈色的结果;油墨填料中含有Na, Mg, S, Cl, K, Ca, V, Zn, Ba等元素,推断油墨填料为MgCO₃, CaCO₃, BaSO₄等物质。上述三项技术联用,在邮票等纸质品的无损分析中具有广阔的应用前景。     

FTIR－PAS技术在卟啉类化合物中的应用（Ⅳ）──稀土乙酰丙酮－meso－四－（α－萘基）四苯并卟啉配合物的红外光谱

研究了ｍｅｓｏ－四－（α－萘基）四苯并卟啉及其Ｄｙ，Ｈｏ，Ｅｒ，ＴＭ，Ｙｂ，Ｌｕ乙酸丙酮形成的配合物在３６００～２２０ｃｍ－１范围内的傅里叶变换红外光声光谱（ＦＴＩＲ－ＰＡＳ），对主要谱带进行了经验归属。结果表明，四－（ａ－萘基）四苯并卟啉与稀土乙酰丙酮配合物中稀土金属离子配位削弱了乙酰丙酮环上Ｍ—Ｏ键的伸缩振动，使此谱带向低波数位移。金属敏感港带出现在～１５１３，～１３２３～１０９０，１０５３和～２５０ｃｍ－１。     

173Lu和174gLu衰变数据的测量

175Lu（n;2n）174m,gLu（n;2n）173Lu反应在高能中子通量监测中具有重要作用,其产物的放射性活度通常用HPGe探测器测量,这就需要174m,gLu和173Lu的半衰期和γ射线发射率等衰变数据必须准确无误。在主要的评价核数据库中,只有ENDF/B 7.1和JEFF 3.1.1数据库给出了173Lu和174Lu的半衰期和γ射线的发射几率等衰变数据,其中173Lu的射线发射几率ENDF/B 7.1库比JEFF 3.1.1库总体偏高,其他评价数据两个数据库非常一致。在中国原子能研究院的串列加速器上用20 MeV质子辐照金属Yb靶生产了含有173Lu,174m,gLu的放射性溶液,用激光共振电离质谱（LRIMS）和热表面电离质谱（TIMS）两种同位素稀释法测定了该溶液中173Lu和174m,gLu核素浓度,然后制备测量源在HPGe探测器上进行了近7年的跟踪测量,发现173Lu的半衰期为1.45 a,比目前评价的数据1.37 a高6.1%,636.1 keV射线发射几率的偏差最大,比ENDF/B 7.1的评价数据偏高7%。174gLu半衰期的测量结果3.37 a175Lu（n;2n）174m,gLu（n;2n）173Lu反应在高能中子通量监测中具有重要作用,其产物的放射性活度通常用HPGe探测器测量,这就需要174m,gLu和173Lu的半衰期和γ射线发射率等衰变数据必须准确无误。在主要的评价核数据库中,只有ENDF/B 7.1和JEFF 3.1.1数据库给出了173Lu和174Lu的半衰期和射线的发射几率等衰变数据,其中173Lu的射线发射几率ENDF/B 7.1库比JEFF 3.1.1库总体偏高,其他评价数据两个数据库非常一致。在中国原子能研究院的串列加速器上用20 MeV质子辐照金属Yb靶生产了含有173Lu,174m,gLu的放射性溶液,用激光共振电离质谱（LRIMS）和热表面电离质谱（TIMS）两种同位素稀释法测定了该溶液中173Lu和174m,gLu核素浓度,然后制备测量源在HPGe探测器上进行了近7年的跟踪测量,发现173Lu的半衰期为1.45 a,比目前评价的数据1.37 a高6.1%,636.1 keV γ射线发射几率的偏差最大,比ENDF/B 7.1的评价数据偏高7%。174gLu半衰期的测量结果3.37 a,比评价数据3.31 a高约1.8%,174gLu 76.5 keV和1 241.8 keV γ射线的发射几率比ENDF/B 7.1的评价数据分别低1.87%和12.8%。175Lu(n,2n)174m,gLu(n,2n)173Lu are important neutron reactions to monitor the high energy neutron fluxes and the residual nuclei, 174m,gLu and 173Lu, are usually measured by a HPGe spectrometer conveniently so that the decay data such as half lives and gamma-ray emission probabilities of 174m,gLu and 173Lu must be accurate. There are evaluated decay data only in ENDF/B 7.1 and JEFF 3.1.1 among the major evaluated nuclear data libraries, where the most data are almost same besides the gamma-ray emission probabilities of 173Lu are higher in ENDF/B 7.1 than that in JEFF 3.1.1. Yb metal as a target was irradiated by 20 MeV proton beams on a tandem accelerator in CIAE to produce 174m,gLu and 173Lu, and 176Lu isotopic dilution methods based upon a laser resonance ionization mass spectrometer (LRIMS) and a thermal surface ionization mass spectrometer (TIMS) were employed to determine the numbers of nuclides of 174Lu and 173Lu in a solution containing the irradiated target. Several radioactive sources made from the solution had been measured by a HPGe detector during the past 7 years and the peak intensities of the characteristic gamma-rays from 174gLu and 173Lu were analyzed to determine the half lives and gamma-ray emission probabilities. According to the measurements, the half life of 173Lu is 1.45 a, which is about 6.1% longer than the evaluated 1.37 a, and the gamma-ray emission probabilities of 173Lu is also different from the evaluated data, especially the emission probability of 636.1 keV gamma-ray of 173Lu is 7% higher than the value in ENDF/B 7.1. The half life of 174gLu is 3.37 a, about 1.8% longer than the evaluated 3.31 a, and the emission probabilities of 76.5 keV and 1 241.8 keV gamma-rays of 174Lu are 1.87% and 12.8% lower than the evaluated data in ENDF/B 7.1, respectively.     

Effect of Laser Cooling on Frequency Standard of Single Ca^＋ Ion Trapped in a Radio-Frequency Paul Trap

The source of systematic frequency shift of single-ion optical frequency standard of^40 Ca^＋ ion trapped in endcap trap and laser-cooled to a few of mK is analysed and calculated. Second-order Doppler shift, Stark shift due to micromotion and thermal motion, blackbody Stark shift and ac Stark shift are calculated for the ground state and excited 3d ^2D5/2 state. The Hertz-level measurement of the optical clock frequency in a single ^40Ca^＋ ion can be performed.     

利用发射光谱进行常压介质阻挡放电等离子体诊断及其在材料表面改性上的应用(英文)

使用介质阻挡放电光谱诊断装置,对常压介质阻挡放电在材料改性过程中的等离子体发射光谱进行测量,记录和比较了空气、氦气和氩气常压介质阻挡放电等离子体发射光谱,并运用氩元素谱线的相对强度来诊断电子温度等物理参量,以达到对材料表面改性过程的实时监控。工作的结果对常压介质阻挡放电及其在材料改性上的应用具有重要的意义     

圆感应同步器数显表检测方法研究

介绍了圆感应同步器数显表测角系统的工作原理,以及在静态和动态测角方法。提出了两种提高动态测量精度的方法。实验数据验证了方法的合理性。     

基于FPGA+DSP系统的红外图像非均匀校正的实现

首先引述了红外探测器两点法进行图像非均匀校正的原理,给出了基于DSP+FPGA的图像处理系统硬件模块整体实现框图,以及其非均匀校正模块的硬件结构。然后对其非均匀校正模块硬件实现中的芯片选择,工作流程以及实现作了详细的阐述。最后给出了非均匀校正试验的结果。     

液滴在粗糙固体表面上的铺展特性

本文建立了粗糙固体表面上液滴铺展过程的理论模型并采用了格子Boltzmann方法进行数值模拟,研究了粗糙与光滑表面上液滴铺展过程的形貌变化。研究结果表明,无论表面光滑还是粗糙,液滴都沿着半径方向逐渐铺展,整体首先呈帽形,随着时间的推移,液滴在表面铺展成一平面。粗糙表面与光滑表面铺展特性间的差异主要在于粗糙表面液滴受到粗糙元干扰,其铺展形状随时间推移由圆形向八边形过渡.粗糙元间隙的增大导致液滴润湿半径增大,液滴厚度沿半径方向变化梯度降低。     

Phase Dependence of Fluorescence Spectrum of a Two-Level Atom in a Trichromatic Field

We examine the phase-dependent effects in resonance fluorescence of a two-level atom driven by a trichromatic modulated field. It is shown that the fluorescence spectrum depends crucially on the sum of relative phases of the sideband components compared to the central component, not simply on the respective phases. The appearance or disappearance of the central peak and the selective elimination of the sideband peaks are achieved simply by varying the sum phase. Once the sum phase is fixed, the spectrum keeps its features unchanged regardless of the respective relative phases.     

空心阴极放电沉积氮化碳薄膜的结构和成键性质

利用空心阴极放电等离子体源在Si(100)衬底上沉积了氮化碳薄膜.用XRD,SEM,XPS及拉曼和红外吸收光谱对薄膜的结构、成分和化学键等进行了研究.XRD分析表明,制备的氮化碳薄膜为非晶结构.XPS分析证实了薄膜中以C—C,sp2CN和sp3CN键为主,并得出薄膜中的氮碳比为0.71,而sp3—CN相的含量也达到了0.39.拉曼和红外吸收光谱的结果也与XPS分析的键态结果一致.