铂氧化铁电极在硼酸-四硼酸钠溶液中的阴极过程

用动电位法研究了铂氧化铁(Fe_3O_4,α-Fe_2O_3,γ-Fe_2O_3)电极在不同pH的H_3BO_3-Na_2B_4O_7水溶液中的阴极过程。对脱氧溶液中,较低过电位区域出现异常的Tafel常数,作者从电极过程动力学分析确认这-反应是氧化铁的固相还原反应。讨论了溶液pH对氧化铁还原反应速率的影响和氧化铁铁锈在腐蚀过程中的作用。     

维维安·韦斯特伍德：忠于自我

英国杂志《观察者》称她是“英望道上的皇后”，作为一个先锋战士，一个现代文化之母，她为他们打破了桎梏，冲击了所谓“窒息的时尚沙龙”。在2005年的秀场上．橘色头发的阿婆仍然是镜头前最in的人。她还是一个熟谙媒体效应的人精，V&A博物馆为她举办的展览是时尚朝圣者的必看功课。你可以不赞同她的狂放．但不能不被她独特的设计理念所打动．你可以不喜欢她的服装风格．但是不得不面对事实世上难以记数的摇滚青年时髦人士、时尚编辑和娱乐明星都在争相恐后为这个品牌贡献大把银子．这都不是没有道理的“她是过去十年里英国最有影响的设计师．她的设计思想从根本上改变了我们的服装观念。     

Thermoluminescence study of rare earth ion （Dy^3＋） doped LiF：Mg crystals grown by EFG technique

This work describes investigation of radiation dosimetry characteristics of magnesium (Mg) doped lithium fluoride (LiF) crystals co-doped with different concentrations of dysprosium (Dy). These crystals were grown by edge defined film fed crystal growth (EFG) tech-nique. Thermoluminescence (TL) measurements were made on as grown (AG) and annealed (AN) crystals after they were irradiated with a gamma dose of 15 Gy. The influence and advantage of optimized Dy3+ concentration in enhancing the thermoluminescence (TL) properties of LiF:Mg samples were discussed. The normalized peak height of the annealed crystals was nearly 3 times that of the as grown crystals for the particular concentration samples irradiated with Co60 gamma source showed linearity up to 10 Gy. Thermoluminescence signal observed over a period of one month showed negligible fading. Thermoluminescence glow curve structure of optimized phosphor remained stable for higher doses of gamma rays of 103 Gy. Glow curve was analyzed using computer glow curve deconvolution (CGCD) method and trapping parame-ters were calculated.     

赵晓丽团队在锶离子诱导干细胞不对称分裂促进骨再生的研究取得进展

中国科学院深圳先进技术研究院人体组织与器官退行性研究中心赵晓丽与潘浩波团队在锶离子诱导干细胞不对称分裂促进骨再生的研究取得进展.相应成果"Strontium regulates stem cell fate during osteogenic differentiation through asymmetric cel...     

Titanium

Potentialities of titanium and its alloys are steadily being realized. With the exception of atomic energy, there is perhaps no other industry engaged in the volume of simultaneous research, development, and production that is carried out by producers, government, users, and potential users. The word titanium has become as common as steel, although the quantities of each produced cannot be compared on any basis.That any additional information on the production or uses of titanium is eagerly awaited was evidenced by the attendance at the Titanium Symposium held at the Institute of Metals Div. Fall Meeting in Philadelphia in October 1952. While originally presented as an off-the-record session, JOURNAL OF METALS has obtained the release of most of the papers presented, and these papers follow in this issue.Those who attended the Symposium were fortunate in being able to hear M. A. Hunter recount his early experiences in producing pure titanium. We have reproduced his paper faithfully, not only for its historical significance, but in an attempt to retain some insight into a man who has contributed much to the profession of metallurgy and metallurgical engineering.Significantly included are the aims and accomplishments of the Air Force, Army, and Navy, and current work being done by titanium producers and users.We wish to thank all who contributed to this issue, for helping to spread the technical information throughout industry.     

Investigation of Pt-Dy co-doping effects on isothermal oxidation behavior of （Co,Ni）-based alloy

A Co32Ni21Cr8Al0.6Y (wt.%) alloy with and without doping 3 wt.% platinum, or co-doping 3 wt.% platinum and 0.1 wt.% dysprosium was produced by arc melting. The hardness of both base alloy and composition-modified alloy was measured by using a Vickers hardness tester. Isothermal oxidation tests at 1000 ℃ in static air atmosphere were conducted to assess the isothermal oxidation behavior of the alloys. The microstructure and composition of the tested alloys before and after oxidation were investigated by means of X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM) equipped with energy dispersive spectroscopy (EDS) and back scatter detector. Results showed that platinum had significant influence on microstructure of the tested alloy by the formation of β-(Ni,Pt)Al phase. Addition of 3 wt.% platinum could slightly increase the hardness of the tested alloy. Platinum accelerated phase transformation of alumina from metastable θ-Al 2 O 3 to stable α-Al 2 O 3 and suppressed the consumption of β-phase. Co-doping both 3 wt.% platinum and 0.1 wt.% dysprosium induced the fastest transformation of θto αalumina and the formation of a fine-grained oxide scales. The most effective reduction of oxidation rate was achieved by the Pt-Dy co-doping effects.     

无线传感器网络技术与市场应用前景(下)

无线传感网络已经越来越广泛地应用于各行各业中,本文选取一些经典案例,并对其市场应用前景做一些分析。