PROGRESS IN NMR APPLICATIONS TO WELL LOGGING AND FORMATION EVALUATION

Since its discovery in 1946, NMR has become a valuable tool in physics, chemistry, biology, and medicine. With the invention of NMR logging tools that take the medical MRI or laboratory NMR equipment and turn it inside-out, the application of sophisticated laboratory techniques to determine formation properties in situ is now available. The capability has opened a new era in formation evaluation just as the introduction of NMR has revolutionized the other scientific areas.     

液相添加剂对PTCR陶瓷电性能的影响

液相添加剂ＡＳＴ（Ａｌ２Ｏ３＋ＳｉＯ２＋ＴｉＯ２）对ＢａＴｉＯ３陶瓷材料电性能的影响很大，随着Ａｌ２Ｏ３含量的增加，材料的电性能降低；ＳｉＯ２、ＴｉＯ２的物理特性对材料电性能影响较大；过量ＴｉＯ２对材料ＰＴＣ效应有重要影响，适当过量ＴｉＯ２含量，可得到性能优良的ＰＴＣＲ陶瓷。     

集成对数放大器

对数放大器由于其特殊的性能而在雷达接收机，通信、遥控和激光测距系统中具有十分广泛的用途。详细叙述了对数放大器的性能，特性，介绍了几种主要的对数放大器类型及其工作原理，考查了国外对数放大器的发展情况，介绍了国内集成对数放大器的主要性能指标及其用途。。     

Study of Strange Quark Mass in CFL Phase

[1]M.Alford,K.Rajagopal,and F.Wilczek,Phys.Lett.B 422 (1998) 247; Nucl.Phys.B 537 (1999) 443. [2]M.Gyulassy and L.McLerran,arXiv:nucl-th/0405013;E.V.Shuryak,arXiv:hep-ph/0405066. [3]K.Rajagopal and F.Wilczek,hep-ph/0011333. [4]M.Alford,Chris Kouvaris,and K.Rajagopal,hepph/0406137. [5]Y.Nambu and G.Jona-Lasinio,Phys.Rev.122 (1961)345. [6]R.T.Cahill and C.D.Roberts,Phys.Rev.D 32 (1985)2419. [7]R.T.Cahill and Susan M.Ganner,hep-ph/9812491. [8]A.W.Steiner,S.Reddy,and M.Prakash,Phys.Rev.D 66 (2002) 094007. [9]P.Amore,M.C.Birse,J.A.McGovern,and N.R.Walet,Phys.Rev.D 65 (2002) 074005. [10]M.Alford and K.Rajagopal,JHEP 0206 (2002) 031. [11]Xiao-Fu Li,Yu-Xin Liu,Hong-Shi Zong,and En-GuangZhao,Phys.Rev.C 58 (1998) 1195. [12]H.Reinhardt,Phys.Lett.B 244 (1990) 2. [13]Steven Weinberg,The Quantum Theory of Fields,Vol.2,Cambridge University Press,Cambridge (1996) p.348.     

Effective-Field Theory on High Spin Systems with Biaxial Crystal Field

Based on the effective-field theory with self-spin correlations and the differential operator technique,physical properties of the spin-2 system with biaxial crystal field on the simple cubic, body-centered cubic, as well as faced-centered lattice have been studied. The influences of the external longitudinal magnetic field on the magnetization,internal energy, specific heat, and susceptibility have been discussed in detail. The phenomenon that the magnetization in the ground state shows quantum effects produced by the biaxial transverse crystal field has been found.     

MSTP在3G的应用

讨论了MSTP的技术特点,指出MSTP能高效可靠传输各种业务,并结合3G网络的业务发展以及3G传输关注的接口,提出采用引入ATM功能的MSTP技术解决3G传输网络的方案.     

神经网络应用于有限角CT图像重建

本文采用连续型Hopfield神经网络(HNN)模型应用于有限角CT图像重建，该重建算法将两种优化准则转化为模型的能量系数求取图像重建的最优解，通过数值模拟，考察了该重建算法和抗噪性能，均得到了良好的结果。     

影响有线数字电视机顶盒发展的因素

从用户需求、节目源、价格、资金、行业体制等方面论述了影响有线数字电视机顶盒发展的因素。     

基于TS101型DSP链路口的多通道高精度数据采集电路设计

介绍一种基于数字信号处理器(DSP)TS101链路口的多通道高精度数据采集电路的设计方法,详细阐述利用多个ADS8361型A/D转换器进行数据采集,并经TS101链路口传输数据的FP-GA和DSP设计实现,讨论如何提高A/D转换精度的问题.     

基于ARM的浮点数转换成整数的改进算法

研究了基于IEEE754标准的浮点数的存储格式，提出了一种基于ARM7的改进的浮点数转换成整型数的算法。分析了C／C＋＋中的强制类型转换和改进浮点数转换成整数的算法，比较了两种算法的优缺点。并把改进算法移植到嵌入式平台ARM上。