MSP2148型信号接收前端电路

本文叙述了采用MCM(LTCC)技术研制生产的S波段的信号接收前端电路，解决了低的噪声系数、多层互连传输模型的建立、混合金属导体技术等关键工艺技术问题，研制的产品经用户使用，完全满足合同指标和使用要求，真正意义上将LTCC技术应用于微波领域，前景广阔。     

乡村型多功能变频供水系统的设计与实现

本文介绍了利用人机界面（HMI）变频器（VVVF）和PLC构成的多功能小型恒压供水系统的设计与实现，系统具有自动化程度高，便于维护，耗电量小等优点。广泛适用于乡镇，农村等基础设施薄弱地区。     

Lifetimes of Excited Levels in ^131Ce

The fusion-evaporation reaction ^116Sn (^19F, p3n)^131 Ce at projectile energy of 95 MeV is used to populate high spin states in ^131Ce. The de-exciting γ-rays are detected in γ-γ coincidence measurement with Compton-suppressed BGO-HPGe detectors. Level lifetimes of ^131 Ce were determined by using the Doppler shift attenuation method.The experimental results indicate that collectivity of ^131 Ce is reduced relative to that of ^130Ce and it follows that deformation decreases with increase of the neutron number on the basis of systematic comparison of transition quadrupole moments for the light cerium isotopes.     

嵌入式系统开发平台的构建和实现

本文从软硬件两方面介绍了构建嵌入式系统开发平台的基本思路,并给出了一套实现方案。该平台硬件部分低成本、扩展性强、升级方便;软件部分功能丰富,操作系统内核基于开放源代码的mClinux系统,成熟稳定,GUI支持中文。     

硅衬底上铁电薄膜的自偏压异质结效应

本文运用半导体能带理论探讨了硅衬底上铁电薄膜的异质结效应的物理模型．对用sol－gel工艺制备的PZT／Si结构的极化特性、开关特性和I－V特性的实验研究证实了这种效应．     

Analytical Solution and Production of Coherent State of the Generalized Dissipative Two-Mode Optical System

We obtain the analytical solution to the master equation in the photon number representation by using algebraic dynamical method in the nonautonomous case. Based on the solution we find that a two-mode coherent sate can be produced within dissipative background, and the averaged photon number for each mode is related to the damping constant, external field amplitude and coupling constant between two modes.