超导电机问世

美国国防部防卫高级研究计划署（Defense Advanced Research Projects Agency）与Phasebridge公司签订了一份合同．内容是进一步发展光学射频正交相位移频键控（QPSK．quadrature-phase—shift-keying）调制技术在超宽带、捷频及军用无线电系统中的应用。此次计划的目标是为了集成频率合成技术．以及通过转换方法将毫米波通道的频率转换为微波。为达到目标．需要利用集成光路和微光镜头实现光电转换．这种方法成本低．重量轻．正好符合微小产品的特性。     

一种FFT和CZT联合的快速高精度频率估计算法

频率估计在通信信号侦察中占有重要地位,CZT算法以其直接、快速、经济的特点适用于当前对频率估计快速、高精度的要求.分析了CZT算法的特点,提出一种联合FFT和CZT的快速高精度算法.通过比较该算法与直接进行FFT计算的运算量,证明了联合算法的优点,并通过MATLAB仿真加以验证.     

“十一五”压电陶瓷频率元器件发展趋势

压电陶瓷频率元器件包括滤波器、谐振器、陷波器、鉴频器等，已广泛应用于电子、激光、超声、通讯、导航、航天、自动控制、计量检测、精密加工、传感技术和引燃引爆等领域，成为当今高新技术的主要研究方向之一。“十五”期间列入新型电子元器件目录，是电子元器件发展的重点。     

合作与创新：中国电子业发展新基调

2005年下半年以来,“合作与创新”成为中国电子业出现频率最高的热门词,这预示着以大规模低成本制造为特征的中国电子业,开始了以技术创新、应用创新为核心的技术驱动型产业结构调整。而为了尽快达到这一调整预     

5个频率环游地球——UT斯达康T66双网双待机“世界风”手机

十几年前的通信标准之争，将当今的无线通信世界划分为GSM与CDMA构成的两个半球，而“分久必合”的必然发展趋势却在UT斯达康T66双模双待机手机推出之后得以实现。     

Self-Mixing Interference in Dual-Polarization Microchip Nd：YAG Lasers

The self-mixing interference in dual-polarization microchip Nd: YA G lasers is demonstrated. Under optical feedback, the orthogonal polarization components of the laser would undergo antiphase intensity modulations; at high feedback level, the polarization switching appears. We also observe that the laser self-mixing sensitivity changes periodically with the frequency difference of orthogonal polarizations. An initial theoretical model is put out and agrees well with the experiments. The results are useful for self-mixing sensitivity enhancement and offer a new way of absolute distance measurement.     

Effect of Magnetic Field and Equilibrium Flow on Rayleigh-Taylor Instability

We investigate the effect of a finite equilibrium flow and magnetic field on the Rayleigh-Taylor instability. It is found that the equilibrium flow only makes a frequency shift of perturbation and the growth rate of the Rayleigh-Taylor instability remains unchanged. However, the magnetic field can change the growth rate and, in particular,a very strong magnetic field suppresses the growth rate.