Bernoulli泛函空间中广义计数算子的表示

得到离散时间正规鞅平方可积泛函空间L^{\mathrm{2}}(M)中广义计数算子N_h的5种表示：（1）量子Bernoulli噪声（quantum Bernoulli noises,QBN）\{{?}_k,{?}_k^{\mathrm{*}};k\ge \mathrm{0}\}的加权表示;（2）N_h的谱表示,广义计数算子N_h以h-计数测度{\#}_h的值域为其点谱;（3）N_h的“对角化”表示,N_h可表示为L^{\mathrm{2}}(M)的标准正交基\{Z_{\sigma };\sigma \in \mathrm{\Gamma }\}所生成的一维对角化正交投影算子的加权极限;（4）广义Skorohod积分-广义随机梯度表示,N_h可表示为互共轭算子{\delta }_h和{?}_h的复合算子;（5）对\mathbf{N}上的任意非负函数h,可构造一列有界广义计数算子,N_h恰为该有界广义计数算子的强极限,当h可和时,N_h为该有界广义计数算子的一致极限。     

克孜尔石窟壁画颜料研究

采用扫描电子显微镜X-射线能谱（SEM-EDS）、拉曼光谱（Raman spectra）和傅里叶红外光谱（FTIR）对收集自克孜尔石窟第69窟的14个壁画颜料样品进行检测与分析鉴定。结果显示：蓝色颜料为青金石;绿色颜料主要为氯铜矿,在表面泛黄的绿色样品中检出了藤黄;红色颜料为赤铁矿;在白色颜料样品中检出了磷氯铅矿-砷铅矿和石膏;在灰色颜料样品中检出了石膏与炭黑。表明初唐时期藤黄已被用作绘画颜料;在矿物颜料上罩染有机染料,体现了古人对矿物颜料和有机染料的高超使用技巧。研究有助于了解壁画的用材、绘制方式等信息,为壁画的研究、保护和修复提供参照和依据,同时也佐证了古丝绸之路沿线贸易、经济、文化的繁荣和昌盛。     

甲醇在γ-Al2O3,CeO2及其负载Pd催化剂上吸附和分解的原位红外光谱研究

利用原位傅里叶变换红外光谱 (FTIR)技术对甲醇在γ Al2 O3,CeO2 以及Pd/Al2 O3,Pd/CeO2 催化剂上的吸附和分解行为进行了研究。综合考虑了载体和活性组分的作用 ,分析了甲醇在不同载体负载Pd催化剂上可能的分解途径。在Pd/CeO2 催化剂上 ,活性组分和载体对甲醇分解的过程表现出了一种协同效应。     

Numerical methods for computing ground states and dynamics of nonlinear relativistic Hartree equation for boson stars

Efficient and accurate numerical methods are presented for computing ground states and dynamics of the three-dimensional (3D) nonlinear relativistic Hartree equation both without and with an external potential. This equation was derived recently for describing the mean field dynamics of boson stars. In its numerics, due to the appearance of pseudodifferential operator which is defined in phase space via symbol, spectral method is more suitable for the discretization in space than other numerical methods such as finite difference method, etc. For computing ground states, a backward Euler sine pseudospectral (BESP) method is proposed based on a gradient flow with discrete normalization; and respectively, for computing dynamics, a time-splitting sine pseudospectral (TSSP) method is presented based on a splitting technique to decouple the nonlinearity. Both BESP and TSSP are efficient in computation via discrete sine transform, and are of spectral accuracy in spatial discretization. TSSP is of second-order accuracy in temporal discretization and conserves the normalization in discretized level. In addition, when the external potential and initial data for dynamics are spherically symmetric, the original 3D problem collapses to a quasi-1D problem, for which both BESP and TSSP methods are extended successfully with a proper change of variables. Finally, extensive numerical results are reported to demonstrate the spectral accuracy of the methods and to show very interesting and complicated phenomena in the mean field dynamics of boson stars.     

GPON体系结构研究

千兆比特无源光网络(GPON)是一种面向下一代网络(NGN)的接入技术,它具有速率高、传输距离长、效率高和可伸缩性强等关键优势.同时,GPON支持引入更高带宽的以太网新业务,并能低成本提供传统的语音服务.介绍了GPON的标准化进展,分析了GPON的系统结构和协议参考模型,并给出了传输汇聚层的分层结构.     

基于可见光-近红外光谱的BIF磁性率确定方法研究

铁矿中磁性率是评价铁矿床工业价值和划分矿石工业类型的重要指标。传统的磁性率测定法存在工作量大、效率低、周期长的缺陷,成为经济、合理、高效开采铁矿资源的瓶颈问题。采用便携式地物光谱测试仪对辽宁省鞍钢集团鞍千矿业有限责任公司的BIF实验样品进行可见光-近红外光谱测试,分析了光谱特征,构建了比值指数(RI)、差值指数(DI)和归一化指数(NDI),并确定光谱指数与样品磁性率相关性最显著的敏感波段及对应的相关系数值;优选出与样品磁性率相关性最显著的比值指数(RI),构建实验样品磁性率的定量反演模型,并进行了验证。结果表明,三种光谱指数与样品磁性率敏感波段均位于935与1 050 nm,且该波段处的相关系数均达到0.9以上,其中比值指数与样品磁性率的相关性最高;基于比值指数构建的实验样品磁性率定量反演模型的预测误差为0.038,反演磁性率与实测磁性率的判定系数(R2)为0.964 5,预测结果比较理想。为确定BIF的磁性率提供了一种新方法,该方法具有工作强度小、经济、高效、便捷的优点,且对遥感找矿具有一定指导意义。     

激光拉曼光谱法测定天然气组成标准研究

进行了天然气组成分析-激光拉曼光谱法标准化研究,探讨了激光拉曼天然气组成分析方法标准化的可行性。采用激光拉曼光谱进行天然气组成分析,无需将天然气中各组分分离便可实现多组分同步检测,减少分析时长,提高测量的实时性,实现快速分析,通过国内外激光拉曼天然气分析方法和标准的研究和实验,掌握了国内外激光拉曼天然气分析方法技术现状及发展方向,积累了激光拉曼天然气分析试验数据,结果表明激光拉曼天然气分析具有可快速检测(10 s)、连续记录和操作简单的优点,适用于天然气录井、井站、集气站原料气气质分析和天然气净化处理中过程控制中实时快速获取气质数据,建议制定激光拉曼光谱天然气分析方法标准,测量组分为CO₂,N₂,H₂S,CH₄,C₂H₆,C₃H₈,测量范围分别为：CH₄：75%~99.9%,C₂H₆：0.005%~20%,C₃H₈：0.005%~10%,H₂S：0.001 5%~10%,N₂：0.02%~10%,CO₂：0.01%~10%(上述浓度均为摩尔分数),为上游领域天然气勘探开发及过程控制服务。     

Upshot of Chemical Species and Nonlinear Thermal Radiation on Oldroyd-B Nanofluid Flow Past a Bi-directional Stretched Surface with Heat Generation/Absorption ina Porous Media

A three-dimensional mathematical model is developed to examine the flow of nonlinear thermal radiation Oldroyd-B nanofluid past a bidirectional linearly stretched surface in a porous medium. The flow is induced by temperature dependent thermal conductivity, chemical reaction and convective heat and mass conditions. Novel characteristics of Brownian motion and thermophoresis are accompanied by magnetohydrodynamic and heat generation/absorption. Self-similar transformations are employed to convert the system of nonlinear partial differential equations to a system of ordinary differential equations with high nonlinearity and are solved by strong analytic technique named as Homotopy Analysis method (HAM). Effects of varied arising parameters on involved distributions are reflected through graphical illustrations. From this study, it is perceived that strong magnetic field hinders the fluid's motion and leads to rise in temperature that eventually lowers heat transfer rate from the surface. Further, decrease in heat transfer rate is also observed for enhanced values of thermal radiation parameter. To validate our results, a comparison with already published paper in limiting case is also given and results are found in excellent oncurrence; hence reliable results are being presented.     

Design strategy for flat-field Schmidt optical system

The present study provides the theory base for designing flat-field Schmidt optical systems, based on the wavefront aberration of Petzval field curvature, a mathematic model of the Petzval radius is setting up. The radius of Petzval image surface is not equal to the focal length of the primary mirror or the focal length of the system. An aberration balancing method for flat-field Schmidt optical systems design is proposed: did not change parameters of the corrector, through adjusting the distance between the plate and the mirror to realize aberration equilibrium. The total physical track is more compact than equilibrium before.     

Can contributions to B_s→l＋l-γ from the magnetic-penguin operator with real photons in the standard model be neglected？

Using the Bs meson wave function extracted from non-leptonic Bs decays, we reevaluate the rare decays Bs→l＋l- γ,（l=e,μ） in the Standard Model, including two kinds of contributions from the magnetic-penguin operator with virtual and real photons. We find that contributions to the exclusive decays from the magnetic-penguin operator b→sγ with real photons, which were regarded as negligible in the previous literature, are large and the branching ratios Bs→l＋l-γ are enhanced by a factor of almost 2. With the predicted branching ratios of the order of 10-8, it is expected that these radiative dileptonic decays will be detected in LHC-b and B factories in the near future.