HL-2M 装置宽谱段光谱诊断系统研制

HL-2M 装置宽谱段光谱诊断系统由采集光学、石英光纤和集成式光栅光谱仪构成,工作波段为 300~1100nm,可实现对工作气体(氢及其同位素)和内在杂质(碳、铁、氧等)线辐射的同步监测。通过将 5 台紧凑 型光谱仪并联形成集成式光栅光谱仪,可在保证宽谱段覆盖的同时实现较好的光谱分辨(0.04~0.19nm⋅pixel⁻¹)。目 前系统具有一个空间通道,最优时间分辨为 1.05ms,常规采样时间为 20ms。在 HL-2M 装置初始等离子体放电 实验期间,利用该套系统识别出氢等离子体的主要杂质为碳和氧,并对不同粒子的辐射特性进行了初步分析。     

A spectroscopic study of laser-induced tin–lead plasma: Transition probabilities for spectral lines of Sn I

In this paper, we present transition probabilities for 97 spectral lines of Sn I, corresponding to transitions n(n = 6,7,8)s → 5p², n(n = 5,6,7)d → 5p², 5p³ → 5p², n(n = 7)p → 6s, determined by measuring the intensities of the emission lines of a Laser-induced breakdown (emission) spectrometry (LIBS). The optical emission spectroscopy from a laser-induced plasma generated by a 10 640 Å radiation, with an irradiance of 1.4 × 10¹⁰ Wcm^− 2 on an Sn–Pb alloy (an Sn content of approximately 20%), in vacuum, was recorded at 0.8 µs, and analysed between 1900 and 7000 Å. The population-level distribution and corresponding temperature were obtained using Boltzmann plots. The electron density of the plasma was determined using well-known Stark broadening parameters of spectral lines. The plasma under study had an electron temperature of 13,200 K and an electron number density of 2 × 10¹⁶ cm^− 3. The experimental relative transition probabilities were put on an absolute scale using the branching ratio method to calculate Sn I multiplet transition probabilities from available radiative lifetime data of their upper states and plotting the Sn I emission spectrum lines on a Boltzmann plot assuming local thermodynamic equilibrium (LTE) to be valid and following Boltzmann's law. The LTE conditions and plasma homogeneity have been checked. Special attention was paid to the possible self-absorption of the different transitions. The experimental results obtained have been compared with the experimental values given by other authors.     

ICF中子发射时间诊断

 对ICF中子发射时间的诊断技术进行了研究,研制了基于快闪烁体和微通道板式光电倍增管的中子发射时间探测器。在某大型激光原型装置上进行了中子发射时间的实验测量,成功获得多发实验的中子发射时间与打靶激光脉冲的时间及中子发射时间之间的关系。实验结果表明：中子发射时间探测器对DT中子和DD中子都能够响应,中子产额测量下限达到10⁷,时间测量不确定度小于20 ps;CH烧蚀层越厚,中子发射时间越长。     

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为了获取HL-2A等离子体的离子温度、旋转速度及其分布等重要参数,首次在HL-2A装置上开展了CXRS诊断。通过利用能有效探测微弱光的EMCCD和特殊设计的光学采集系统,获得了具有足够信噪比的诊断信号。实验得到的测量信号分析表明,设计是切实可行的。     

Development of an HPTLC‐based diagnostic method for invasive aspergillosis

A rapid, sensitive and specific high‐performance thin‐layer chromatographic (HPTLC) method was developed and validated for determination of gliotoxin in Aspergillus infected immunocompromised patients with invasive aspergillosis (IA). Densitometric analysis of gliotoxin was carried out in the absorbance mode at 254 nm after single‐step extraction with chloroform. The method uses TLC aluminum plates pre‐coated with silica gel 60F‐254 as a stationary phase and toluene–isoamyl alcohol–methanol (10:0.5:0.5, v/v/v) as mobile phase, which gives compact spot of gliotoxin (R_f = 0.51). The calibration curve was linear (r² ≥ 0.994) between peak area and concentration in the tested range of 100–1000 ng spot^?1 with minimum detectable range 0.025 ng μ^?1 of serum sample. The mean ± SD value of slope and intercept of the standard chromatogram of gliotoxin were found to be 523.2 ± 1.555635 and 915.8 ± 30.68843, respectively. The developed method is simple, rapid, precise and less costly than earlier diagnostic methods, and different serum samples can be run on a single TLC plate for comparative analysis. The proposed method can be used to analyze gliotoxin in patient serum for easy, rapid and cost‐effective diagnosis of IA. Copyright © 2009 John Wiley & Sons, Ltd.     

PCVD过程中的等离子体诊断

本文综述了ＰＣＶＤ过程中等离子体各种粒子和基团的诊断技术和方法。结合我们的研究工作，着重分析诊断技术在发展过程中所碰到的难题及其解决办法和仍待解决的问题。     

特殊状态特殊修理的可修系统可靠性和诊断策略

本研究了特殊状态需要特殊修理的可修系统的可靠性和诊断策略。假设系统有三种运行状态：正常状态、异常状态、故障状态，有些异常状态和故障状态需要特殊的修理，系统处于哪个状态需要诊断才能知道。每当系统开始正常工作状态后，每隔一段随机时间T进行一次诊断，直到系统故障或被诊断为异常。利用概率分析和向量马尔科夫过程方法，求得了系统的可靠性指标并研究了最优诊断策略。     

激光等离子体物理实验数据格式研究

 鉴于现行激光等离子体物理实验数据属于无格式的原始数据，从数据分析的角度出发，在研究总结“星光”和“神光”实验数据的基础上，合理规划了激光等离子体物理实验数据文件格式，并据此重新编写了数据采集程序和数据格式转换程序。叙述了新格式数据文件的优点及应用。     

Simple Millimeter Wave Dielectric Disc Filter with Very Flat Passband Characteristic

A particular fitter design suitable for millimeter- and submillimeter-waves is presented. By mounting equally spaced dielectric discs of identical thickness inside an overmoded circular waveguide very flat bandpass-filters with a relative bandwidth of about ±6% can be achieved. Normalized to the guided wavelength the air spacing corresponds to 1/4, 3/4, ... whereas the thickness of the dielectric disc is an integer multiple of 1/2. This particular design is possible for an odd number of discs only. A design example shows 19 GHz bandwidth at 150 GHz. A typical application is side-band filtering for radiometers at plasma experiments.     

鲁东南含漂白层土壤的特点及诊断分类

较全面的研究了鲁东南含漂白层的三个供试土壤的诊断特性，探讨了它们在中国土壤系统分类修订方案中的地位，认为它们应属于漂白湿润淋溶土土类的两个亚类。