近红外光谱分析原理、检测及定标技术简介

近年来,近红外光谱技术以其独特的优越性越来越受到人们的关注,已成为发展最快、最引人注目的分析技术之一.近红外光谱技术对样品的分析要通过校正模型的建立来实现,实验结果的准确性与定标模型的可靠性有直接的关系,所以如何建立一个准确、可靠的定标模型在近红外光谱技术使用中至关重要.     

可扩展大屏幕高分辨率并行显示系统的构建及其在地学中的应用

可扩展大屏幕高分辨率并行显示系统的构建,包括硬件环境、软件环境与软件技术、图形校正与颜色校正.基于SAGE和VizRoll大屏幕显示技术,利用PC-cluster及LCD构建了一个可扩展4×5高分辨率并行显示阵列,并实现了高分辨率并行显示系统在地学可视化中的几个典型应用.     

基于曲线匹配的星载激光测高仪无场在轨几何定标方法

星载激光测高技术的快速发展急需有效的在轨几何定标方法来校正测高数据中的系统误差。探索一种基于曲线匹配的测高仪无场在轨几何定标方法。该方法利用激光足印高程曲线与DEM进行匹配获得激光足印控制点进而实现定标参数求解,无需到野外布设探测器定标场地。采用资源三号02星激光测高数据进行定标方法验证,并对定标结果进行精度评估。实验表明,经本文的定标方法校正后的测高数据的精度得到显著提升,验证了本方法的有效性。     

谈可燃气体报警器的校正

介绍目前工业生产及公共安全方面常用各种可燃气体报警器的传感器一般原理及如何对其进行合理、有效的校正,并对一些校正过程中可能遇到的问题予以说明和讲解。     

电解质分析仪校准方法的探讨

介绍分析电解质分析仪的工作原理、计量特性、校准标物及校准方法,为临床监护及法定计量机构开展电解质分析仪的检测工作提供了一定的理论依据。     

基于三维重建的分布式卫星SAR干涉测高模型及误差分析

基于InSAR目标三维重建原理对分布式卫星SAR干涉测高系统模型及工作原理进行了分析,给出了完整的目标位置三维重建闭合形式解;并对影响三维重建精度的主要误差源——基线矢量误差和干涉相位误差进行了详细分析;最后通过仿真分析了基线矢量误差和干涉相位误差特性,从而为系统参量定标及其校正提供了基础.     

化学计量学中几种常用多变量校正法的应用

作为化学量测的基础理论和方法学，化学计量学的应用非常广泛。尤其在分析检测多组分体系中具有快速、准确、简便的特点。根据近年来的相关文献，LS、PLS、KF及TFA等几种常用的多变量校正法在分析化学等领域具有极其广泛的应用。     

Comparison of methods for determining power generated on a rope-braked cycle ergometer during low-intensity exercise

This study compares the instrumentation and analysis techniques used when determining the power expended pedalling a rope-braked ergometer manufactured by Monark (Sweden) during a low intensity test. Power values were generated by eight subjects. The instrumentation consisted of load cells to measure the rope brake forces, a tachometer to measure the flywheel velocity and instrumented pedal cranks manufactured by Schoberer Rad Messtechnik (SRM). The subjects pedalled a rope-braked ergometer at 60 rev min^-1, against a resistance of 3 kg, for 5 minutes. Three different measurements of the mean power were recorded and these were compared with the value given by Monark. The SRM cranks provided two sets of results using different software packages supplied with the cranks. SRM standard software is used for taking measurements during training and cycle races over long time periods. An additional piece of software is provided by SRM called Ptnew, which gives readings of torque and pedal cadence over periods up to 30 seconds. Using the values supplied by Monark each subject generated 180 W of power. The mean power for the eight subjects, measured using the SRM cranks, was 170.36 W (SD 4.11) using the alternative SRM software (Ptnew) over a 30 second period and 173.68 W (SD 2.21) using the standard SRM software. From the direct measurement of the brake forces and flywheel velocity the mean power across the eight subjects was 148.90 W (SD 5.89). The SRM cranks measure the input power, whereas the direct measurement system measures the power output excluding mechanical losses. These values give a figure for the mechanical efficiency for the roped-braked ergometer of 88%. It was found that Monark overestimates the power generated by the subjects when compared with both the SRM systems and the direct measurement instrumentation.     

基于遗传算法的阵列相位误差校正

针对声纳水听器阵列比较突出的相位误差,研究了一种基于遗传算法的阵列校正方法。该方法利用无相位误差时阵列协方差矩阵具有Toeplitz结构的特性构造代价函数,并以此作为遗传算法中进化个体的适应度函数,由算法搜索的最优个体得到阵元相位误差的估值。计算机仿真结果表明,该方法可以明显地减小阵列相位误差对MUSIC算法DOA估计结果的影响。     

Fitting V F Converter*ss Output Using High Order Neural Networks

提出了一种利用高阶神经网络拟合ＶＦ型ＡＤＣ输出特性的新方法,实现了ＶＦＣ１１０芯片在４ＭＨｚ满量程时的非线性估计．设计了两种动态在线标定电路用于提高采样精度．该方法也可用于类似场合的传感器输出特性的非线性拟合．