铯钌合金中钌的测定

研究了钯钌合金中钌的测定方法,在强酸性溶液中和在有乙醇作稳定剂时,钌可与硫脲形成稳定的蓝配合物;在最大吸收波长处测定,５０μｇ／５０ｍｌ－２５０μ／５０ｍｌ的钌经尔定律。     

三氯偶氮氯膦－Ru（Ⅲ）－KIO_4体系催化分光光度法测定微量钌

在酸性介质中，微量Ｒｕ（Ⅲ）的存在对ＫＩＯ＿４氧化三氯偶氮氯膦的褪色反应有明显的催化作用。据此褪色反应建立了微量钌的催化光度分析法，方法的检出限为０．０２μｇ／１０ｍｌ，Ｒｕ（Ⅲ）在０．０２～０．３０μｇ／１０ｍｌ有良好的线性关系。反应在水相中进行，应用于贵金属精矿中钌的测定，结果满意。     

三氯偶氮氯膦—Ru（Ⅲ）—KIO4体系催化分光光度法测定微量钌

在酸性介质中，微量Ｒｕ（Ⅲ）的存在对ＫＩＯ４氧化三氯偶氮氯膦的褪色反庆有明显的催化作用。据此褪色反庆建立了微量钌的催化光度分析法，方法的检出限为０．０２μｇ／１０ｍｌ，Ｒｕ（Ⅲ）在０．０２－０．３０μｇ／１０ｍｌ良好的线性关系。反应在水相中进行，应用于属贵金属精矿中钌的测定，结果满意。     

钌—过氧化氢—二溴苯基荧光酮体系催化光度法测定钌

在氢氧化钠介质中，过氧化氨氧化二溴苯基荧光酮，基于钌的催化效应，拟定了催化光度测定痕量Ｒｕ的新方法。本法的检出限为２．４８×１０￣（－１２）ｇ／ｍｌ，线性范围为０～１５ｎｇ／２５ｍｌ，方法灵敏，可用于矿石中Ｒｕ的测定。     

（Ti0.1V0.9）100-xFex（x=0～6）储氢合金的微观结构及储氢特性

研究了（Ti0.1V0.9）100-xFex（x=0～6）合金的微观结构及其吸放氢特性。微结构分析表明，合金均由单一的体心立方（bcc）结构的钒基固溶体相组成；合金的点阵常数随着Fe含量的增加呈线性递减，晶胞体积也随之逐渐降低。储氢性能测试表明，所有合金的动力学性能均比较好，在10℃和4MPa初始氢压条件下，合金无需氢化孕育期就能吸氢。随着Fe含量从x=0增加至x=6，合金的活化性能得到改善；10℃最大吸氢量从509．5ml／g逐渐降至424．8ml／g；50℃有效放氢量先升后降，并在x=4时达到最高值255．6ml／g。在所研究的合金中，Ti9.6V86.4Fe4合金具有最佳综合性能，经2次吸放氢循环即可活化，10℃最大吸氢量为494．5ml／g，50℃有效放氢量达到255．6ml／g。     

流动注射催化动力学荧光光度法测定痕量钌

作者发现Ｒｕ（Ⅲ）对ＫＢｒＯ３氧化罗丹明６Ｇ使其荧光强度降低的反应具有显著的催化作用,并将主一新的指示反应和流动注射分析技术相结合,建立了测定Ｒｕ的催化动力学流动注灾光光度分析新方法,其检测限为０．８μｇ／Ｌ,线性范围为２．０～６０．０μｇ／Ｌ,进样频率为６５次／ｈ,该方法已用于人工合成样品中痕量Ｒｕ的测定,结果满意。     

原子吸收法测定化合物三氯化钌中的钠

在5%盐酸介质中,采用原子吸收分光光度计测量三氯化钌中的钠含量。波长选择589.0 nm,钠标准工作曲线范围为0～2.0μg/mL,线性相关系数为0.9999。研究了酸介质、仪器工作条件、基体、干扰元素等因素对测量结果的影响。方法的加标回收率为94.7%～101.5%,不确定度为0.0082μg/mL,检出限为0.001μg/mL。     

地球化学勘探样品中超痕量锇、钌分析方法研究

介绍了地球化学勘探样品中超痕量锇、钌的分析方法。作者研制出新型的锇、钌稀释剂,有效降低全流程空白值。样品经过氧化钠分解,酸化后蒸馏,使锇、钌从混合物中分离出来,同时彼此完全分离。采用Ce(Ⅳ)．As(Ⅲ)体系催化光度法测定锇、钌。其检出限均达到O．02ng／g。本方法采用一般实验设备,满足1：20万化探对铂族元素分析技术的要求。     

氧化除钌-ICP-AES法测定钌化合物中的杂质元素

利用四氧化钌易挥发的特点,将钌溶液用高氯酸冒烟去除钌,用ICP-AES测定样品中杂质元素。对钌基体干扰、高氯酸用量、杂质元素分析谱线、仪器分析参数等进行了研究,确定了最佳实验条件。结果表明,采用高氯酸冒烟,可将试液中钌含量降低至50 μg/mL以下,有效消除钌对杂质元素的光谱干扰。方法具有较宽的测定范围,对三氯化钌样品中20个杂质元素测定的相对标准偏差(RSD,n=9)为2.0%~3.5%,加标回收率在86.3%~118.0%之间,可满足钌化合物中杂质元素的测定要求。     

Ru(Ⅲ)-DAoCM-KIO4体系催化光度法测定痕量钌

在磷酸介质及加热条件下 ,Ru(Ⅲ )对KIO4氧化二安替比林邻氯苯基甲烷(DAoCM)显色反应有强烈的催化作用 ,由此建立了测定痕量Ru的催化分光光度分析法 ,体系的非催化反应 (吸光度为Ao)和催化反应 (吸光度为A)的最大吸收波长均为 50 5nm ,Ru含量在 0 0～ 12 0 0ng/2 5ml范围内符合比尔定律 ,检测限为 2 0× 10 - 1 0 g/ml,反应的表观活化能为 75 3 3kJ/mol,反应表观速率常数为 4 77× 10 - 4/s,方法用于矿样中痕量Ru的测定 ,结果满意。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.