游标法事件计时器

根据游标法事件计时器的设计原理，给出基于现场可编门阵列(FPGA)的设计方案，并对实现游标法事件计时器的技术难点进行相关分析。     

Conversion Gain and Interpixel Capacitance of Cmos Hybrid Focal Plane Arrays

The conversion gain of optical and infrared focal plane CMOS hybrid arrays is a fundamental parameter, whose value computes into the derivation of other parameters characterizing the performance of a detector. The widespread “noise squared versus signal” method used to obtain the conversion gain can overestimate the nodal capacitance of the detector pixel by more than 20% for infrared arrays and by more than 100% for Si-PIN diode arrays. This is because this method does not take account of the capacitive coupling between neighboring pixels. A simple technique has been developed to measure the nodal capacitance directly by comparing the voltage change of an external calibrated capacitor with the voltage change on the nodal capacitor of the detector pixel. The method is elaborated in detail and has been verified with a Si-PIN diode array hybridized to a Hawaii-2RG multiplexer using an Fe ⁵⁵ X-ray source. It is also in good agreement with a stochastic method based on 2D autocorrelation.     

用于太阳射电快速记录系统中的微带功率晶体管放大器的研制

本文介绍了云南天文台微带功率晶体管放大器在太阳射电快速记录系统中的设计原理和技术性能，并给出了放大器的线路图和最初的测量结果。     

On Cross-talk Correction of Images from Multiple-port CCDs

Multi-channel CCD read-out, which is an option offered at most optical observatories, can significantly reduce the time spent on reading the detector. The penalty of using this option is the so-called amplifier cross-talk, which causes contamination across the output amplifiers, typically at the level of 1:10 000.This can be a serious problem for applications where high precision and/or high contrast is of importance. We represent an analysis of amplifier cross-talk for two instruments – FORS1 at the ESO VLT telescope Antu (Paranal) and DFOSC at the Danish 1.54 m telescope (La Silla) – and present a post-processing method for removing the imprint of cross-talk. It is found that cross-talk may significantly contaminate high-precision photometry in crowded fields, but it can be effectively eliminated during data reduction. This revised version was published online in July 2006 with corrections to the Cover Date.     

生态斑块粒度效应研究——以长三角地区无锡市为例

从人为干扰明显、生态性脆弱、幅度范围在1 000km2的角度出发,该文选取了长三角地区无锡市为研究对象。通过采用多因子加权叠加模型方法获取了研究区的生态斑块,借助景观指数等探讨了生态斑块粒度效应及其临界变化情况。结果表明:1)以生态斑块为研究斑块类型时,类型水平景观指数、景观水平指数和面积变化指数均具有明显粒度效应,并存在临界粒度和尺度域现象。2)三类指数的临界粒度一致为粒度2,即实际为60m;尺度域分别为(2,30)、(2,10)和(2,10),综合尺度域为(2,10),即实际为60～300m,是符合研究区特性的尺度域。在该尺度域范围内,指数粒度变化响应曲线变化平稳,蕴含的生态过程较为相似,进行尺度推绎具有可行性。     

水文信息自动测报系统

基于可编程逻辑控制器的测量与控制技术,设计了水文信息自动测报系统,实现对不同区域的水位与雨量采集测量,并通过GPRS无线通信模块与Inter-net实现组网,把分布在不同现场的水情数据定时传送到水文信息中心进行汇总,实现水文信息的远程测量、监视、报表打印、趋势分析与报警等功能.最后给出的实际测试结果表明了该系统的可行性及精确性.     

实时闪电电磁场同步观测系统

阐述如何对亚微秒级的闪电电磁场变化波形进行同步采集。设计制作了量程可调的快、慢电场变化观测系统,用以获取闪电电场变化信息,并结合磁场同步资料实现了不同环境下的闪电观测要求。基于数据采集卡（PCI-5105）和Labwindows/CVI开发平台,研制了闪电波形同步数据采集系统和分析处理软件。整套系统具有高采样率、大容量、多参量、同步观测等特点,并已通过野外试验的验证,为研究闪电放电的微物理过程提供了探测手段。     

基于AD598的伸缩仪放大电路设计

伸缩仪多用于地壳形变观测,但其在工程中亦有较大的应用前景.现用的放大电路精度高但电路复杂、成本过高,造成其工程应用方面的局限性.介绍基于单片式线位移差动变压器(LVDT)信号调节器AD598设计的全新伸缩仪放大电路,作为伸缩仪放大电路的补充,体现了其在工程应用中简单可靠、成本低的优势.     

SII型海洋重力仪摆增益调节方法与应用

不同序号的海洋重力仪内部结构有所不同,常规使用的摆增益调节方法对有些仪器无效。详细介绍了摆增益调节的要求以及三种不同的摆增益调节方法,分析了这三种摆增益调节方法的优缺点,并就如何选择使用这三种不同的摆增益调节方法提出了建议,实践证明效果良好。     

Problem and Improvement of R-values Applied to Assessment of Earthquake Forecast

The researches on the assessment of earthquake forecast are reviewed, then the R-value assessment is further developed theoretically in the paper. The results include the arithmetic of the R-values of earthquake occurrence under the condition that “anomaly“ occurred or no “anomaly“ occurred respectively, and the relation between the values. The distribution of Rvalue of a forecast method, corresponding to multi-status anomalies being independent each other, is also developed in the paper. The appropriate methods to estimate the R-values and extrapolate the occurrence probability of future earthquakes are also given in the paper.