三种钢铁材料的光电光谱分析

介绍了铁基线材、高铬铸铁、高锰钢等3种钢铁的光电光谱定量测定方法。该方法是通过选用与分析材质同基体，主成分接近的标准样品绘制校准曲线，采用自编的计算机校正程序，找出试样的光谱分析值和化学分析值之间的关系模型，并将模型通过计算机程序拟合到控制样品中，当进行材质测定时，只需要在日常标准化操作后将拟合好的控制样品对校准曲线进行控样校正，就可以直接进行试样的测定。该测定方法实用，结果可靠，适用于无相同标准样品条件下的试样光谱定量分析。     

钢中残量元素As,Sn,Sb的X射线荧光光谱分析

本文介绍了用日本理学3530XRF光谱仪扫描道测定钢中痕量元素As、Sn、Sb。由于短波强大的背景破坏了检测线的线性,通过用DATAFLEX 181B背景扣除的数据处理,消除了这些影响,成功地校准了曲线。方法简单;快速;XRFS结果与化学分析一致,该法已用于炼钢的过程控制和原材料分析。     

7503B型直读光谱仪分析炉前熔清磷

本文介绍了国产７５０３Ｂ型光电直读光谱仪用于分析炉前熔清钢水中磷元素成分的一种方法，选择和确定了最佳工作条件，校准曲线和控制样品，此方法快速，准确，分析结果令人满意。     

Double-beta decay Q values of Cd and Te

The Q values of the ¹¹⁶Cd and ¹³⁰Te double-beta decaying nuclei were determined by using a Penning trap mass spectrometer. The new atomic mass difference between ¹¹⁶Cd and ¹¹⁶Sn of 2813.50(13) keV differs by 4.5 keV and is 30 times more precise than the previous value of 2809(4) keV. The new value for ¹³⁰Te, 2526.97(23) keV is close to the Canadian Penning trap value of 2527.01 ± 0.32 keV (Scielzo et al., 2009) [1], but differs from the Florida State University trap value of 2527.518 ± 0.013 keV (Redshaw et al., 2009) [2] by 0.55 keV (2σ). These values are sufficiently precise for ongoing neutrinoless double-beta decay searches in ¹¹⁶Cd and ¹³⁰Te. Hence, our Q values were used to compute accurate phase-space integrals for these double-beta decay nuclei. In addition, experimental two-neutrino double-beta decay nuclear matrix elements were determined and compared with the theoretical values. The neutrinoless double-beta decay half-lives for these nuclei were estimated using our precise phase-space integrals and considering the range of the best available matrix elements values.     

Adjustable microwave absorption properties of flake shaped (Ni0.5Zn0.5)Fe2O4/Co nanocomposites with stress induced orientation

Flake shaped (Ni_0.5Zn_0.5)Fe₂O₄/Co nanocomposites were successfully fabricated by co-precipitating of Ni-Zn ferrite on the surface of cobalt nanoflakes. The electromagnetic characteristics of the samples were studied at the frequency of 0.1–14 GHz. The results showed that the cobalt nanoflakes in compacted nanocomposites were well orientated, and the nanocomposites were characterized with low optimal reflection loss (RL) of −33.8 dB at 11.5 GHz and broad RL bandwidth for <−20 dB in the frequency range of 7.6–12.1 GHz. At the same time, the position of the absorptive band can be adjusted by changing the mass ratio of ferrite to cobalt in the nanocomposites. It is proposed that the excellent microwave absorption properties are related to the combination of strong shape anisotropy of cobalt nanoflakes and adjustable dielectric loss.     

A proposed U.S./China theoretical/experimental collaborative effort on baryon resonance extraction

In this paper we discuss the reasons for our work towards establishing a new collaboration between Jefferson Lab （JLab） and the Institute of High Energy Physics （IHEP） in Beijing. We seek to combine experimentalists and theorists into a dedicated group focused on better understanding the current and future data from JLab and from the Beijing Electron Positron Collider （BEPC）. Recent JLab results on the extraction of single- and double-polarization observables in both the lπ- and 2π-channel show their high sensitivity to small production amplitudes and therefore their importance for the extraction of resonance parameters. The Beijing Electron Spectrometer （BES） at the BEPC has collected high statistics data on J/ψ production. Its decay into baryon-antibaryon channels offers a unique and complementary way of probing nucleon resonances. The CEBAF Large Acceptance Spectrometer, CLAS, has access to N＊ form factors at high Q2 which is advantageous for the study of dynamical properties of nucleon resonances, while the low-background BES results will be able to provide guidance for the search for less-dominant excited states at JLab. Moreover, with the recently approved experimental proposal Nucleon Resonance Studies with CLAS12 and the high-quality data streaming from BES-Ⅲand CLAS, the time has come for forging a new Trans-Pacific collaboration of theorists and experimentalists on NSTAR physics.     

光电直读光谱仪中文软件的开发应用

在研究光电直读光谱仪英文软件系统的基础上,保留原英文软件所有功能,结合实际应用,开发了在Windows界面下操作的中文软件。该软件功能强大,实用性强,操作简单直观,易于掌握。     

基于微梯形弹光晶体的大光程差PEM研究

针对目前基于弹光调制器(photoelastic modulator,PEM)的傅里叶变换光谱测量技术(PEM-FTS)的光谱分辨率低,并且PEM调制光程差有限、多次反射对入射光斑大小要求高且光能利用率低等缺点。提出一种基于微梯形八角结构弹光晶体的大光程差PEM方法。通过改进弹光晶体结构,使其为微梯形八角结构,两个通光面略微成一定夹角,该结构PEM不仅可以有效提高PEM调制的最大光程差,而且对入射光斑要求较小。理论推导分析了该PEM的最大调制光程差,并推导得出任意角、任意位置入射时PEM的最大调制光程差公式;通过多物理场耦合仿真软件COMSOL Multiphysics 4.3a对PEM的振动模态和应力分布进行分析;结合PEM的最大调制光程差和光能利用率,分析了寻找最佳入射角的方法。设计加工该PEM,其中弹光晶体选用硒化锌晶体,压电晶体选用压电石英晶体。采用波长为632.8 nm的氦氖激光进行实验分析,实验结果显示,在相同驱动电压下,该PEM的最大调制光程差是普通PEM的19.25倍,与理论仿真的相对误差为1.3%。     

Validation and Calculation of Alpha Decay Parameters using MATLAB and Different Standard Sources

This work investigates in some details the conditions and parameters affecting and controlling the performance of the α‐spectrometer. The quality and accuracy of any results depend on the optimum working parameters. The major geometrical parameters, α‐spectra, energy resolution and half‐life time were comprehensively studied and validated for the α‐spectrometer. The spectrometer, at the optimized conditions, was used for analysis of IAEA reference α‐sources as quality control measure. The results of the optimized parameters verification for enhancing the system performance, the specific activity (SA), the Half‐life time were precisely validated, calculated and discussed as equations, figures and tables. The MATLAB software was also used with standard point sources for producing curves showing the relationship between half‐life times and both kinetic energy (Q) and angular momentum (L) of the α‐particles.     

嫦娥一号卫星干涉成像光谱仪现场性能检测实验

介绍了嫦娥一号卫星有效载荷—干涉成像光谱仪现场性能检测实验,包括焦距检测实验、MTF检测实验、谱线位置和光谱分辨率定标检测实验、光谱辐射度定标检测实验.分析了检测的必要性,确定了检测判据,制订了检测方案,规定了实验条件,给出了检测结果.通过实验,保证了干涉成像光谱仪以确定的和良好的技术状态发射.