基于H.264的可视电话软件开发

为了开发基于H.264标准的可视电话,采用高性能高速视频数字处理芯片(TMS320DM642)作视频编解码器,充分利用芯片的并行和流水处理功能,在单芯片上实现了视/音频编解码的并行实时处理,并达到可视电话实时通信要求.     

各向异性网格下特征值问题的有限元分析

主要目的是在各向异性网格下研究二阶椭圆特征值问题的两类非协调有限元—类Wilson矩形元和Carey三角形元—的收敛性分析.通过新的技巧和方法,得到了与传统有限元网格剖分下相同的特征对的最优误差估计.推广了已有的结果.     

Research on nonlinear constitutive relationship of permanent deformation in asphalt pavements

To predict correctly the rut depths in asphalt pavements, a new nonlinear viscoelastic-elastoplastic constitutive model of permanent deformation in asphalt pavements is presented. The model combines a generalized Maxwell model with an elastoplastic one. Then from the creep theory, the linear and nonlinear constitutive equations of the generalized Maxwell model are obtained. From the nonlinear finite element method for the rutting of the asphalt pavement, the rut depths of 4 asphalt-aggregate mixtures are obtained. And the results are compared with the ones from the finite element method by SHRP and the experiments by SWK/UN. The results in this paper are better than the ones by SHRP, and agree with the ones of the experiment by SWK/UN. This shows that the nonlinear viscoelastic-elastoplastic constitutive model, which is presented in this paper for the rutting of the asphalt pavement, is effective. The properties, such as nonlinear elasticity, plasticity, viscoelasticity and nonlinear viscoelasticity, which affect the rutting of an asphalt pavement, can be shown in the model. And the characteristics of the permanent deformation of the asphalt pavement can be presented entirely in the model.     

供应链管理基础浅析

文章阐述了主要对电子商务中的供应链管理基础，并对其进行了分析。     

核ANC和激发态中子晕

利用转移反应¹¹B(d,p)¹²B和¹²C(d,p)¹³C抽取¹²B<—>¹¹B+n和¹³C<—>¹²C+n重叠函数的核渐近归一化常数,计算了¹²B和¹³C核中价中子密度分布的均方根半径及其在核外的几率.实验结果表明,¹²B的第二(J^π=2^－),第三(J^π=1^－)激发态和13C的第一(J^π=1/2⁺)激发态为中子晕态,而¹³C的第三(J^π=5/2⁺)激发态是中子皮态.考察了库仑势和角动量对晕形成的阻碍效应.提出了均方根半径对于有效核子分离能的统一的标度定律.     

The Enhancement Absorption of Light Field Induced By Optical Radiation on the off Resonance in Cesium Vapor Cell

A large increase of atomic absorption via atomic coherence is observed in Cesium atoms in the condition of off resonance in degenerate two-level atomic systems. We show that when on resonance, the reduction of atomic absorption via EIT accured. But when we tune the coupling field on the off resonance, the enhancement of absorption via EIA is obtained for the probe field. The influences of the two-photon detuning and intensity of coupling field on the absorption are also studied experimentally.     

多孔球层内核态沸腾过程特性的实验观察

本文以水为实验工质,对从底部加热多孔球层内核态沸腾过程进行可视化观察。通过高速图像采集系统;拍摄和观察了孔隙内汽泡的成长过程,在实验观察的基础上,对多孔球层内核态沸腾过程的一些基本特性进行了分析和讨论。     

~(159)TbII超精细结构光谱测量

利用具有光谱高分辨和选择性激发等特点的共线快离子束激光光谱学方法研究了159Tb II亚稳态 4 f95 d7H08和激发态 4 f96 p3 / 2 ( 1 5 /2 ,3/2 )的超精细结构光谱 ,所有光谱线可以很好地分辨 ;并由实验测量到的高分辨超精细结构光谱 ,给出了相应能级的超精细结构常数     

中子星内部非奇异-奇异夸克物质的相变

研究了中子星内部从两味夸克物质到三味夸克物质的相变过程。发现这个过程的时标短至10^-7s,并且在相变中奇异夸克所参加的半轻子过程是中微子能量损失的主要过程。这样,1.4M_⊙质量的中子星内部的非奇异-奇异夸克物质相变会有几个10⁵¹erg的能量以中微子形式发射出去,这将表现为一种中微子爆现象。     

HRR脉间变频外场RCS测试设备的简化设计

分析和对比了两种常用的HRR脉间变频外场RCS测试设备的设计方法，针对脉间变频格式RCS测试一维成像的特点提出了一种简化设计的思路。由于快速跳频源制造技术的进步，通过适当调整系统的设计参数，将原来所采用的正交解调硬件结构简化为单通道的处理结构，而系统的测试能力没有受到影响。该简化设计能够减少大约30％的微波元器件，降低了成本，精简了结构。最后给出了该设计的外场测试结果，并对测试结果进行了分析。