用ICP—直读光谱测定合金铸铁标准物质中NiCuMoV元素的方法

本方法选择了最佳分析条件、试验了试剂、基体的影响以及共存元素的干扰,测试了方法的精密度和准确度。表明:试剂、基体以及其存元素均无明显影响,精密度和准确度符合相应的国家标准的要求。     

Study of the mineral profile of Catalonian “brut” cava using atomic spectrometric methods

The aim of this study was to investigate the content of several metals in different commercial sparkling wines, all of them with the denomination of origin cava, in order to characterise them. Sixteen metals were determined in 18 samples of cava by inductively coupled plasma atomic-emission spectrometry (ICP-AES), hydride generation atomic-absorption spectrometry (HG-AAS) and graphite furnace atomic-absorption spectrometry (GF-AAS). Al, Ba, Ca, Cu, Fe, K, Mg, Mn, Na, P, Sr and Zn were analysed by ICP-AES; HG-AAS was employed for As quantification and GF-AAS for Ni, Cd and Pb analysis. The procedure involved the degasification of the cava sample by sonication, followed by H₂O₂/H₂SO₄ treatment and heating in an oven.     

用ICP发射光谱分析钢中硫

泵用ICP发射光谱法分析钢中的硫。确定了最优的溶样方法和分析条件。分析了10多个标准样品。检查了共存元素和试剂用量的影响。测定了分析精度和分析下限。     

EEG/MEG source imaging in the absence of subject's brain MRI scan: Perspective on co-registration and MRI selection approach

EEG/MEG source localization requires a subject's brain MRI to compute the sourcemodel and headmodel . As part of this computation, co-registration of the digitized head information and brain MRI scan is the essential step. However, in the absence of a brain MRI scan, an approximated sourcemodel and headmodel can be computed from the subject's digitized head information and brain MRI scans from other subjects. In the present work, we compared the fiducial (FID)- and iterative closet point (ICP)-based co-registration approaches for computing an approximated sourcemodel using single and multiple available brain MRI scans. We also evaluated the two different template MRI selection strategies: one is based on objective registration error, and another on sourcemodel approximation error. The outcome suggests that averaged approximated solutions using multiple template brain MRI scans showed better performance than single-template MRI-based solutions. The FID-based approach performed better than the ICP-based approach for co-registration of the digitized head surface and brain MRI scan. While selecting template MRIs, the selection approach based on objective registration error showed better performance than a sourcemodel approximation error-based criterion. Cross-dataset performance analysis showed a higher model approximation error than within-dataset analysis. In conclusion, the FID-based co-registration approach and objective registration error-based MRI selection criteria provide a simple, fast and more accurate solution to compute averaged approximated models compared with the ICP-based approach. The demography of brain MRI scans should be similar to that of the query subject whose brain MRI scan was unavailable.     

ICP—AES法测定土壤样品中的硼

建立了用ICP—AES测定土壤中硼的分析方法,并对各种最佳分析条件进行探讨。在最佳条件下,用该方法对国家一级标准物质中的痕量硼进行了测定,结果与标准值相符。本法的检出限为0．09mg/kg,精密度为2．30％～4．55％（RSD,n=10）,加标回收率为95．0％-103．3％。本方法快速简便,能满足科研及生产中硼的测...     

丝绸之路且末古国墓地出土玻璃器成分特点研究

位于丝绸之路南道上的新疆且末古国扎滚鲁克墓地M133墓和M49墓分别出土了一批珍贵的玻璃料珠和一件玻璃杯,时代为东汉-南北朝时期(公元1-6世纪)。利用激光刻蚀电感耦合等离子体发射光谱(LA-ICP-AES)对这批样品进行化学成分分析。分析数据显示,这批样品具有典型的西方钠钙玻璃的成分特点。根据现代西方古代玻璃研究体系中助熔剂的不同,这批玻璃又划分为天然碱玻璃和植物灰玻璃两类,并对玻璃成分的相似性与差异进行探讨。该研究反映了以玻璃为载体且末古国与西方的贸易与文化交流的历史,而且为玻璃产地来源与制作工艺研究提供了重要的参考。     

电感耦合等离子体发射光谱测定米中的铜

铜是人体健康不可缺少的微量营养素,对于血液、中枢神经和免疫系统,头发、皮肤和骨骼组织以及脑子和肝、心等内脏的发育和功能有重要影响。本试验通过ICP对大米标准物质进行研究,测得精密度RSD%在1.153%左右,回收率在95.0%～101.7%,方法可靠、效果理想。     

基于特征点的改进ICP三维点云配准技术

三维点云配准是三维面型反求中的关键和难点。提出了一种特征点三维点云配准技术。通过引入被测物的特征点,分析了坐标变换矩阵的求解方法,利用最小二乘算法求出初始变换矩阵,得到粗略配准结果。然后采用K-D树来加速搜索最近点,用均方距离作为误差度量准则实现了改进后的最近点     

硅深刻蚀中掩蔽层材料的研究

掩蔽层材料选择比低是硅高深宽比微结构实现的限制之一.为了获得高质量的掩蔽层材料,利用感应耦合等离子体(Inductively Coupled Plasma,ICP)刻蚀方法,选择SiO2,MgO,Al作为掩蔽层材料,通过研究刻蚀过程中射频功率及气体流量对SiO2,MgO,Al及Si刻蚀速率变化的影响,获得了SF6等离子体对Si与SiO2,Si与MgO,Si与Al的选择比.结果表明:MgO薄膜作为掩蔽层、射频功率为800 W,气体流量为50 sccm或80 sccm是深刻蚀中适宜的工艺参数.