用硫代米Chi酮分光光度法同时测定铂钯

在ＴｒｉｔｏｎＸ－１００存在下的乙酸盐缓冲溶液中用硫代米Ｃｈｉ桐（ＴＭＫ）分光光度法同时测定Ｐｄ，Ｐｔ实验表明，室温下Ｐｄ（Ⅱ）Ｐｔ（Ⅳ）共存互相干扰，但在抗坏血酸（ＶＣ）存在下可抑掉大量Ｐｔ的显色而测定Ｐｄ，在ＶＣ－ＫＩ存在下Ｐｄ，Ｐｔ同时显色，差减法测定Ｐｔ。采用双（十二烷基亚磺酰）乙烷高选择性萃取Ｐｄ，Ｐｔ而与贱金属和其它贵金属分离，可应用于高纯Ｃｕ，Ｎｉ及矿物中Ｐｄ，Ｐｔ的测定，获得满意的     

Pt-Pd-Rh合金的高温氧化

用ＴＧ 热重仪测定Ｐｔ－ Ｐｄ － Ｒｈ 合金的挥发失重曲线, 用Ｘ 光电子能谱（ＸＰＳ） 和溅射剥离技术确定其氧化态表层及次表层组元化学状态和浓度。结果表明合金挥发失重曲线遵循： Δｍ ＝ Ｋ０ｔｎ ———直线失重规律。合金组元化学态为Ｐｔ０ 、Ｐｄ０ 、Ｒｈ０ 、Ｒｈ２Ｏ３ , 次表层为Ｐｔ０ 、Ｐｄ０ 、Ｒｈ０ 、ＲｈＯ２ , Ｐｄ０ 相对富集于表层。讨论了Ｐｄ 及少量Ｒｕ 、Ｃｅ 对Ｐｔ － Ｐｄ － Ｒｈ合金挥发失重曲线和表层结构的影响     

Pt—Pd—Rh合金的高温力学性能

在Ｐｔ－４Ｐｄ－３５Ｒｈ合金中将Ｐｄ含量增至１５ｗｔ％时,研究了Ｐｄ及少量Ｃｅ、Ｒｕ对合金在１０００℃以下高温力学性能的影响。实验结果表明在低温下Ｐｄ有一定的强化作用,但降低了合金的抗蠕变性能,而在合金中分别添加Ｃｅ（＜０１ｗｔ％）、Ｒｕ（＜０５ｗｔ％）后,合金的高温力学性能得以改善并优于Ｐｔ－４Ｐｄ－３５Ｒｈ合金,且Ｃｅ对合金的强化作用优于Ｒｕ。     

高钯合金捕集网中钯的状态

用ＸＰＳ研究了氨氧化装置中使用的高钯合金捕集网中钯的化学状态，新网中钯仅以Ｐｄ＾０一种形态存在（Ｐｄ３ｄ５／２，ＢＥ＝３３５．２ｅＶ）使用后，Ｐｄ３ｄ５／２ＢＥ值向高电子结合能力方向位移，钯的化学状态发生变化，以Ｐｄ和ＰｄＯ形态存在，定量测定了Ｐｄ＾０和ＰｄＯ浓度，发现Ｐｔ／Ｐｄ和ＰｄＯ浓度成反比，由此讨论了钯和高钯合金回收铂的机制。     

吐温80-硫酸铵-水的固液体系萃取分离Pt(Ⅳ)、Pd(Ⅱ)、Ir(Ⅳ)碘络阴离子

报道了吐温（Ｔｗｅｅｎ）８０－（ＨＮ４）２ＳＯ４－水的固液萃取体系中Ｐｔ（Ⅳ）、Ｐｄ（Ⅱ）、Ｉｒ（Ⅳ）碘络阴离子的萃取行为,在ＨＣｌ－ＮＨ４Ｉ介质中,该体系可萃取Ｐｔ（Ⅳ）、Ｐｄ（Ⅱ）、Ｉｒ（Ⅳ）,而贱金属不被萃取,可用于Ｐｔ、Ｐｄ、Ｉｒ与贱金属的分离。对合成样进行了萃取分离,并初步探讨其机理。     

TbFeCo/(Pt,Pd,NdCo)多层膜的磁光特性

为了提高记录密度而力求光磁记录的短波长化,这就要求在短波长区域磁光效果大的材料,进一步考虑到磁特性,力求其成分和制取条件的最佳化。现在常用的非晶态ＴｂＦｅＣｏ膜,为了减小其在短波长区域的Ｋｅｒｒ回转角,就必须通过添加其它元素来提高它在短波长区域的磁光效果。为了研究通过添加Ｐｔ、Ｐｄ和ＮｄＣｏ而使得ＴｂＦｅＣｏ能在短波长区域使用的可能性,而制备了ＴｂＦｅＣｏ／（Ｐｔ,Ｐｄ,ＮｄＣｏ）多层膜和ＮｄＴｂＦｅＣｏ合金膜。研究了添加元素、Ｐｔ、Ｐｄ、ＮｄＣｏ各层厚度对多层膜的磁性和磁光特性的影响。研究用的…     

动力学光度法测定钯

根据Ｐｄ对Ｖ－ＤＡｐＥＭ（二安替比林对乙氧基苯基甲烷）显色体系的褪色作用，建立了１种测定Ｐｄ的新方法，方法检出限为０．１μｇ／２５ｍｌ。Ｐｄ的含量在０．５－８μｇ／２５ｍｌ的成线性关系，方法用于Ｐｄ催化剂中痕量Ｐｄ的测定，结果满意。     

离子束溅射制备Co／Pt多层膜的磁性研究

室温下采用ＶＳＭ测定了离子束溅射（ＩＢＳＤ）技术制备的Ｃｏ／Ｐｔ多层膜垂直方向的Ｍ－Ｈ回线。研究结果表明：Ｃｏ／Ｐｔ多层膜中单位体积Ｃｏ的饱和磁化强度ＭｓＣｏ小于块状Ｃｏ的饱和磁化强度;Ｃｏ／Ｐｔ多层膜的饱和磁化强度（Ｍｓ）与厚度有关：随Ｃｏ层厚度ｔＰｔ和多层膜总厚度ｔｆ的增加而增大,随Ｐｔ层厚度ｔｐｔ的增加而减小;外推结果表明当ｔＣｏ小于一个原子层厚（≈０２５ｎｍ）时,室温下Ｃｏ／Ｐｔ多层膜的饱和磁化强度为零,呈顺磁性     

硝酸生产用的Pt-Pd-Rh催化剂表面状态研究

借助于ＣＡ,ＩＣＰ－ＡＥＳ和ＸＰＳ测定了在常压综合法氨氧化装置中使用的Ｐｔ－Ｐｄ－Ｒｈ合金系催化网的组成与表面状态的变化。随着催化网使用时间延长,Ｐｔ的体积浓度降低,Ｆｅ和Ｃａ污染增大。催化网表层中主组元的化学状态为Ｐｔ°,Ｐｄ°,Ｒｈ°,ＲｈＯ２和Ｒｈ２Ｏ３。催化网表面Ｐｔ明显贫化,而Ｐｄ和Ｒｈ相对富集。在合金中增高Ｐｄ的浓度,可降低Ｐｔ的损耗,降低表面Ｒｈ２Ｏ３浓度,因而有利于提高氨转换率。     

钌合金的分离及钌的分析

研究Ｐｄ－Ｎｉ－Ｒｕ和Ｐｔ－Ｐｄ－Ｒｈ－Ｒｕ合金中Ｒｕ的测定方法，合金以锌碎化进行强化预处理，然后经碱熔．水浸和蒸馏，馏出液经浓缩富集后用硫脲显色，此法适用于合金中０．１－１．０％含量Ｒｕ的测定。     

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。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.