ICP光谱法测定精制盐水中的痕量钙、镁离子

介绍了以全谱直读ICP光谱仪采用标准加入法,准确测量离子膜氢氧化钾生产过程中饱和二次精制进槽盐水中存在的μg/L级金属元素Ca、Mg。ICP测定痕量元素,具有快捷、简便、灵敏度高,多种元素同时测定等优点。此方法采用饱和精制进槽盐水稀释一倍进样,有效地防止了在进样过程中盐水结晶而堵塞雾化器中心管。此方法的准确性高,有利地指导了生产,确保了离子膜电槽的正常运转。     

火试金法测定白色K金合金首饰的含金量

运用火试金法测定含Pd白色K金合金首饰的含Au量,考察了降低标准Au与样品的称样量、灰皿的种类、加入适量的Cu与Ag对其含Au量分析结果的影响,并应用ICP验证了其结果的准确性。结果表明,当标准Au与样品的称样量降为160．00～200．00mg时不影响其含Au量的分析结果;分别使用镁砂灰皿和骨灰灰皿,样品含Au量的分析结果与理论含Au量的偏差均在国家标准的允差范围内;标准Au中加入适量的Cu后测得样品的含Au量更接近于其理论含Au量;标准Au与样品中Ag的加入量（2．5～2．7倍Au质量）对样品含Au量分析结果的影响不大。应用本文的方法,国家首饰质量监督检验中心在2006年欧洲分析实验室协会（AEAO）组织的国际比对实验（AEAO Round Robin2006）中取得了很好的分析结果。     

Mullite-bonded SiC-whisker-reinforced SiC matrix composites: Preparation,characterization, and toughening mechanisms

A novel mullite-bonded SiC-whisker-reinforced SiC matrix composite (SiCw/SiC, SiC whisker-to-SiC powder mass ratio of 1:9) was designed and successfully prepared. Before preparing the composite, the inexpensive lab-made SiCw was first modified by an oxidation/leaching process and then coated with Al₂O₃. The kinetics results indicate that the oxidation process can be described by improved shrinking-cylinder models. The aspect ratio of SiCw improved after modification. Subsequently, raw materials with a SiC–SiO₂–Al₂O₃ triple-layered structure were obtained after the Al₂O₃-coating process and used as feedstocks during the subsequent hot-pressing sintering. Finally, the characterization of the composites indicates that the mullite-bonded sample performs better (relative density of 93.8?±?1.4%, flexural strength of 533.3?±?18.2?MPa, fracture toughness of 13.6?±?2.1?MPa?m^1/2, and Vickers hardness of 20.6?±?2.5?GPa) than the reference sample without the mullite interface. The improved toughness could essentially be attributed to the moderately strong interface bonding and effective load transfer effects of the mullite interface.     

电感耦合等离子体质谱法测定地质样品中的镉

采用电感耦合等离子体质谱法测定岩石、土壤、水系沉积物等地质样品中微量镉,方法简便?快速。Cd的检出限为0.0036μg/g,相对标准偏差(n=10)为0.71%,标准Cd加入回收率为94%~106%。该方法用国家一级标准物质验证,结果与推荐值相符。     

阳离子交换分离ICP/MS测定U_3O_8中的微量稀土元素

用硝酸溶解 U3 O8,通过阳离子交换柱 ,实现稀土元素与铀的分离。铀中的稀土元素回收率为 98%～1 0 6%。方法的检测限为 0 .1 ng/ g(3 σ,n=6) ,并讨论了分离条件、仪器参数的最优化选择及残留铀量对稀土元素测量的影响。     

食品元素分析和元素化学形态分析中的ICP-MS应用

综述了近几年来食品中元素分析和元素化学形态分析方面的发展趋势，以及ICP－MS仪器深入该领域的情况。叙述了HPLC－ICP－MS在元素化学形态分析中的一些方法开发和进展。强调了ICP－MS仪器在食品日常分析和研究领域的作用。     

铅锡焊料中杂质元素的ICP-AES测定

本文研究用ICP-AES法同时测定铅锡焊料中Cu、Fe、Bi 3种杂质元素时,溶液 的酸度、基体元素对分析元素测定的光谱干扰问题。采用最优化的条件准确测定杂质元 素的含量。     

Geometry-Aware ICP for Scene Reconstruction from RGB-D Camera

The Iterative Closest Point (ICP) scheme has been widely used for the registration of surfaces and point clouds. However, when working on depth image sequences where there are large geometric planes with small (or even without) details, existing ICP algorithms are prone to tangential drifting and erroneous rotational estimations due to input device errors. In this paper, we propose a novel ICP algorithm that aims to overcome such drawbacks, and provides significantly stabler registration estimation for simultaneous localization and mapping (SLAM) tasks on RGB-D camera inputs. In our approach, the tangential drifting and the rotational estimation error are reduced by: 1) updating the conventional Euclidean distance term with the local geometry information, and 2) introducing a new camera stabilization term that prevents improper camera movement in the calculation. Our approach is simple, fast, effective, and is readily integratable with previous ICP algorithms. We test our new method with the TUM RGB-D SLAM dataset on state-of-the-art real-time 3D dense reconstruction platforms, i.e., ElasticFusion and Kintinuous. Experiments show that our new strategy outperforms all previous ones on various RGB-D data sequences under different combinations of registration systems and solutions.