电感耦合等离子体质谱法测定石墨样品中钒含量的不确定度评价

依据测量不确定度的评价与表示方法,建立了电感耦合等离子体质谱法测定石墨样品中钒含量的不确定度评价的数学模型,并对各不确定度分量进行分析,当样品中V₂O₅含量为0.215%时,其扩展不确定度为0.035%.通过分析发现,曲线拟合、回收率以及重复性试验对测定结果有较大影响.评价方法可为石墨样品中钒的测定结果准确性和置信度提供理论依据.     

Reply to Comment on ‘Multi-shock Compression of Dense Hydrogen-Helium Mixture beyond 100 GPa＇

The data analysis method for the multi-shock experiments and the EOS model used in our recent Letter are inconsistent with what the comment conjectures and claims.     

Comment on ‘Multi-shock Compressions of Dense Hydrogen-Helium Mixture beyond 100 GPa＇

Zhang et al. reported that they conducted lightgas gun experiments to study the behaviour of dense hydrogen/helium gas mixtures, and the optic radiations emanating from the multi-shock reverberations between the iron base-plate and the single crystal sap- phire window were recorded successfully up to the 10th reflection, and 9 shock compression data points were thus obtained. Their gas mixture even reached a high pressure beyond 100 GPa. This comment put forward a few questions on their ‘experimental data＇ reported in Fig. 4 in Ref.     

Hyperchaos--chaos--Hyperchaos Transition in a Class of On--Off Intermittent Systems Driven by a Family of Generalized Lorenz Systems

Blowout bifurcation in nonlinear systems occurs when a chaotic attractor lying in some symmetric subspace becomes transversely unstable. A class of five-dimensional continuous autonomous systems is considered, in which a two-dimensional subsystem is driven by a family of generalized Lorenz systems. The systems have some common dynamical characters. As the coupling parameter changes, blowout bifurcations occur in these systems and brings on change of the systems＇ dynamics. After the bifurcation the phenomenon of on-off intermittency appears. It is observed that the systems undergo a symmetric hyperchaos-chaos-hyperchaos transition via or after blowout bifurcations. An example of the systems is given, in which the drive system is the Chen system. We investigate the dynamical behaviour before and after the blowout bifurcation in the systems and make an analysis of the transition process. It is shown that in such coupled chaotic continuous systems, blowout bifurcation leads to a transition from chaos to hyperchaos for the whole systems, which provides a route to hyperchaos.     

用可调探深的电子能量损失谱研究Sn/Si界面

用可调探测深度的电子能量损失谱辅以俄歇电子能谱和低能电子衍射,研究Sn/Si系统的界面反应。结果表明:当Sn蒸镀量大于两个原子单层,退火温度由400℃到700℃,在Sn/Si(111)界面Sn与Si发生互混,形成几个原子层厚的Sn/Si互混层,该互混层的特征体峰在15.5eV。在相同温度范围退火,Sn/Si(001)界面无可察觉的互混,仍有Sn岛存在,长时间在550℃退火低能电子衍射图形上出现(113)小晶面的衍射斑。 关键词：     

MgB2超导薄膜的微波测量

报道了利用蓝宝石介质谐振器技术测量MgB₂超导薄膜的微波表面电阻R_{s、0K时的穿透深度λ(0)和超导能隙Δ(0).λ(0)和Δ(0)的值是通过先测量样品穿透深度λ(T)的变化量Δλ(T)，然后由BCS理论模型拟合Δλ(T)的实验数据得到的.测试样 品是利用化学气相沉积技术在MgO(111)基片上制备的c轴织构的MgB2超导薄膜， 薄膜的超导转变温度和转变宽度分别为38K和01K.微波测试结果表明在10K，18GHz下M gB2薄膜的Rs约为100μΩ，可以和高质量的YBCO薄膜的Rs值相比拟；BCS理论拟合得到的MgB2超导薄膜的λ(0)=102nm，Δ(0)=113k Tc.}     

海底混输管道停输和再启动瞬态流动规律研究

本文采用大型实验环道模拟和OLGA软件结合探索海底混输管道在停输和再启动过程中的瞬态流动规律.实验模拟表明气液同时停输过程中没有出现过减现象;在保持气量不变的情况下,将液量突然增加,会出现压力过增现象.OLGA软件模拟表明在停输过程中,管线沿线温度下降,可能出现水合物;再启动过程中,平台终端的液量波动幅度很大;停输过程中,整条海底管线的总持液量不断减小,但幅度不大,再启动过程中,总持液量急剧增大,之后又重新达到稳定.     

SILICA—BOUND 1，7—DITHIA—4—AZA—10，13，16—TRIOXACYCLOOCTADECANE AND ITS PLATINUM COMPLEX

Dithia-monoaza 18-Crown-6 and its immobilization product,silica-bound 1,7-dithia-4-aza-10,13,16-trioxa-cyclooctadecane via a spacer of three carbon atoms,and its platinum complex have been synthesized.It is found that the platinum complex is an efficient hydrosilylation catalyst for olefins.The XPS data of the platinum complex are reported.     

近于凸函数族的Fekete－Szegǒ问题

设Ｓ为熟知的单位圆盘内的规范化单叶函数族．Ｆｅｋｅｔｅ－Ｓｚｅｇｏ证明了众所周知的结果最近Ｗ．Ｋｏｅｐｆ考虑了近于凸函数族Ｋ中的相应问题。得到了准确结果［１］．本文讨论了β型近于凸函数族Ｋ（β）中的Ｆｅｋｅｔｅ－Ｓｚｅｇｏ问题，也得到了准确结果，从而推广了文［１］中的结果．     

齐型空间上加权Hardy空间的分子特征

本文首先在齐型空间上定义了一类加权分子，然后建立了齐型空间上加权Ｈａｒｄｙ空间Ｈｐ（ω）的加权分子特征（０＜ｐ≤１）．