自由电子激光的小型化研究

本文通过对自由电子激光输出波长的分析,指出了自由电子激光小型化的研究方向─-微型摆动器的研究。在分析了小周期摆动器研究现状的基础上,提出了电流摆动器。它不但具有与静磁摆动器相同的效果,而且它的周期可以任意调节。因而,它便于控制。最后,还指出了有待进一步研究的问题。     

一种基于单片机的变电站控制保护系统的实现

以单片机８０３１ 为核心组成的采集、保护和通信模块，通过ＲＳ４８５ 的连接，与４８６ 工控微机构成了分布式３５ ｋＶ 变电站的自控系统，实现变电站的计量、保护和控制等功能，以达到变电站的无人值守或少人值守。     

结构粘结剂的试验研究

粘结剂是粘钢加固技术的关键材料,通过对粘结剂的试验研究,得到了粘结剂的拉压试验曲线与材料力学指标以及粘附于各种标号混凝土时,粘结层的抗剪强度;并且还进行了粘结剂的短期流变试验。     

The use of doped polyaniline as an electrode in the galvanic anodic protection of ferrous metals in industrial acid solutions

In order to investigate the galvanic anodic protection (GAP) of ferrous metals (such as 410, 304 and 316 stainless steels) in acid solutions by doped polyaniline (PANi), separate doped PANi powder-pressed electrodes with different surface areas (the area ratio of the PANi electrode to stainless steel is between 1:1 and 1:2) have been prepared. These were coupled with ferrous metal in the following solutions: 5 M sulphuric acid, 5 M phosphoric acid and industrial phosphoric acid (containing 5 M phosphoric acid and 0.05% chloride ion) to construct a galvanic cell, in which PANi is cathode while ferrous metal is anode. The results indicate that a PANi electrode with sufficient area can provide corrosion protection to stainless steel in these acidic solutions. A pilot scale coupling experiment was carried out. The results indicate that PANi is a promising material as an electrode for the anodic protection of ferrous metals in acidic solutions in industrial situations.     

A transmit/receive IF chip set for WCDMA mobiles in 0.35 /spl mu/m CMOS

An implementation of the IF section of WCDMA mobile transceivers with a set of two chips fabricated in an inexpensive 0.35-/spl mu/m two-poly three-metal CMOS process is presented. The transmit/receive chip set integrates quadrature modulators and demodulators, wide dynamic range automatic gain control (AGC) amplifiers, with linear-in-decibel gain control, and associated circuitry. This paper describes the problems encountered and the solutions envisaged to meet stringent specifications, with process and temperature variations, thus overcoming the limitations of CMOS devices, while operating at frequencies in the range of 100 MHz-1 GHz. Detailed measurement results corroborating successful application of the new techniques are reported. A receive AGC dynamic range of 73 dB with linearity error of less than /spl plusmn/2 dB and spread of less than 5 dB for a temperature range of -30/spl deg/C to +85/spl deg/C in the gain control characteristic has been measured. The modulator measurement shows a carrier suppression of 35 dB and sideband/third harmonic suppression of over 46 dB. The core die area of each chip is 1.5 mm/sup 2/.     

空气中^131I的取样和测量方法的研究

本文介绍一种气态和气载~(131)I 取样器。着重介绍了一种指数分布源的效率刻度方法,讨论了与取样有关的一些问题。     

微波辐射电镜生物样品制备方法研究

本文报道一种快速微波辐射电镜样品制备方法──水浴法，以及这个方法在动植物样品超薄切片制备中的应用。实验结果表明，水浴法使得样品可以接受相对较长时间的微波辐射而不致造成任何损伤，浸泡液和样品的温度控制简单而且准确，样品处理的结果内外均匀一致，超微结构保存优秀，完全可与常规制样法和Ｌｏｇｉｎ法的结果相媲美，而且在某些方面水浴法要优于常规法和Ｌｏｇｉｎ法。     

烷基化原料预加氢工艺应用分析

由于来自催化裂化装置的烷基化原料中所含有的丁二烯在烷基化反应中可生成重质油,使产品干点上升,辛烷值下降,并使酸耗增加.针对这种状况,齐鲁石化公司研究院和胜利炼油厂联合开发了QSH-01烷基化原料预加氢催化剂及其相应的工艺技术,来脱除原料中丁二烯.笔者对该工艺技术及其应用作了阐述,并对该技术的应用前景作出分析.     

Computation of Microwave Attenuation on Coplanar Waveguide with Conformal ADI-FDTD Method

A novel Conformal Finite-Difference Time-Domain based on Alternating-Direction Implicit Method(ADI-CFDTD) used to calculate the microwave attenuation on coplanar waveguide(CPW) with complicated cross-section up to 200GHz is presented. This ADI-CFDTD algorithm is the combination of conformal algorithm dealing with the deformed cell with ADI-FDTD, and has unconditionally stable. The difference equations are derived from the Faraday's and Ampere's law. To validate its accuracy and efficiency, as an example, a CPW fabricated on lithium niobate is proposed. Numerical results demonstrate that this new ADI-CFDTD algorithm has more accuracy than that of quasi-static and CFDTD and shows good agreement with experiment data. When frequency is up to millimeter wave band the radiation loss is not negligible in total power loss.     

空气井测井响应现象分析与探讨

空气钻井作为一种新的钻井技术已在四川油田川东地区的zbl井首次投入使用。2003年2月1日，四川测井公司数控分公司对该井进行了测井施工作业，采集了合格的井径、自然伽马、补偿声波、补偿中子、补偿密度和深浅双侧向资料。针对空气井测井中出现的现象进行了分析与探讨，旨在为今后空气井测井系列的选择与解释奠定基础。