虚拟光栅的可视化生成软件设计

基于结构光照明的主动三维测量技术由于具有快速、非接触、高精度、易于实现自动化等测量特点,日益受到人们的重视。文中依据正弦光栅、Ronchi光栅的物理模型,在计算机可视化软件平台上实现对光栅的图像仿真及功能变换,包括光栅类型的选择、光栅密度的设定、对比度的设定、占空比的设定、红绿双频显示、相位移动、正交光栅、混合光栅的生成以及在光栅上添加标记。该软件交互性强,结果直观,操作简单,可应用于日常教学及三维测量技术中虚拟光栅的生成,从而取代实际光栅的使用不便。     

移动P2P视频流媒体体系下的帧位分配算法

针对移动P2P流媒体系统中存在多视频源的特点,提出了多视频源串行和并行调度算法。串行调度算法,接收Peer通过实时侦测的QoS变化触发视频源的更换,并通过流序列时间模型来同步各个视频源。并行调度算法,多个视频源同时提供服务,并通过帧位分配算法分配各视频源的传输任务。帧位分配算法首先将视频序列分成包含固定帧数的块系列,然后进行块级位分配以充分考虑帧间效应。对于单个帧块位分配问题,算法将其建模成了非线性规划问题,通过引入分段线性R-D模型将该问题进一步转换成了普通的线性规划问题,并提出了一个贪婪实现策略。实验结果显示流分配算法能获得高效、平稳的视频质量,而且时间效率也非常高,能较好的满足移动P2P视频流媒体系统的实时性。     

Reconstruction of physics objects at the Circular Electron Positron Collider with Arbor

After the Higgs discovery, precise measurements of the Higgs properties and the electroweak observables become vital for the experimental particle physics. A powerful Higgs/Z factory, the Circular Electron Positron Collider (CEPC) is proposed. The Particle Flow oriented detector design is proposed to the CEPC and a Particle Flow algorithm, Arbor is optimized accordingly. We summarize the physics object reconstruction performance of the Particle Flow oriented detector design with Arbor algorithm and conclude that this combination fulfills the physics requirement of CEPC.     

Observation of ZnO nanoparticles outside pores of nano Zn4O(C8H4O4)3 metal-organic framework

It was recognized that ZnO can be formed during synthesizing nano Zn₄O(C₈H₄O₄)₃ metal-organic framework (nano MOF-5). Furthermore, it is generally accepted that the ZnO is dispersed inside the pores of MOF-5. However, herein, the measurements of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) showed that the crystal particle sizes of ZnO in MOF-5 are in the range of 5-18 nm, which are larger than the pore size of MOF-5 (1.3 nm). This clearly demonstrates that those ZnO nanoparticles are located outside the pores of MOF-5.     

Comparison of the formation epitaxial graphenes on Si- and process and properties of C-face 6H-SiC substrates

In this paper,the epitaxial graphene layers grown on Si-and C-face 6H-SiC substrates are investigated under a low pressure of 400 Pa at 1600 C.By using atomic force microscopy and Raman spectroscopy,we find that there are distinct differences in the formation and the properties between the epitaxial graphene layers grown on the Si-face and the C-face substrates,including the hydrogen etching process,the stacking type,and the number of layers.Hopefully,our results will be useful for improving the quality of the epitaxial graphene on SiC substrate.     

求解(H^)=5/3(a^)+(a^)+2/3((a^)2+(a^)+2)量子系统能谱新方法

通过对形如(H^)=5/3(a^)+(a^)+2/3((a^)2+(a^)+2)哈密顿量的分析、还原和改造,给出求解该量子系统量子化能谱的两种新方法.     

频率漂移下卷积编码DPSK信号的一种新的Viterbi算法

本文在文献［1］的基础上提出一种频率漂移下的Viterbi算法,研究表明该算法性能良好,高信噪比时甚至接近最佳解码性能.     

Terpenoids of the oleoresin of Pinus pumila

Summary 1. The composition of the acid fraction of the oleresin ofPinus pumila (Pall.) Regel. has been studied, and from it has been isolated, in addition to known compounds, the methyl ester of a new labdane acetoxy acid.2. In the hydrocarbon fraction of the oleoresin 11 monoterpenes and 26 sesquiterpenes have been found (and 17 of the latter have been identified).3. The composition of the fraction of neutral oxygen-containing diterpenoids fromP. pumila differs considerably in its diterpenoid components from the corresponding fractions of the oleoresins of botanically related species-P. sibirica andP. koraiensis. Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 299–302, May–June, 1976.