Application of NIR spectroscopy for firmness evaluation of peaches

The use of near infrared （NIR） spectroscopy was proved to be a useful tool for quality analysis of fruits. A bifurcated fiber type NIR spectrometer, with a detection range of 800-2500 nm by InGaAs detector, was used to evaluate the firmness of peaches. Anisotropy of NIR spectra and firmness of peaches in relation to detecting positions of different parts （including three latitudes and three longitudes） were investigated. Both spectra absorbency and firmness of peach were influenced by longitudes （i, ii, iii） and latitudes （A, B, C）. For modeling, two thirds of the samples were used as the calibration set and the remaining one third were used as the validation or prediction set. Partial least square regression （PLSR） models for different longitude and latitude spectra and for the whole fruit show that collecting several NIR spectra from different longitudes and latitudes of a fruit for NIR calibration modeling can improve the modeling performance. In addition, proper spectra pretreatments like scattering correction or derivative also can enhance the modeling performance. The best results obtained in this study were from the holistic model with multiplicative scattering correction （MSC） pretreatment, with correlation coefficient of cross-validation γcv=0.864, root mean square error of cross-validation RMSECV=6.71 N, correlation coefficient of calibration r=0.948, root mean square error of calibration RMSEC=4.21 N and root mean square error of prediction RMSEP=5.42 N. The results of this study are useful for further research and application that when applying NIR spectroscopy for objectives with anisotropic differences, spectra and quality indices are necessarily measured from several parts of each object to improve the modeling performance.     

生化分析仪检定点滴

全自动生化分析仪因自动化程度高、一次检查样本容量大,可在各大中型医院得到广泛应用,根据其结构可分为流动比色池式和分立式两种。本文分别对其检定方法做简单介绍。     

调频广播天馈线系统测试分析

用8754A网络分析仪对调频广播天馈线系统各器件进行了分析和测试，绘出了各器件的测试曲线，讲述了测试步骤和测试技巧，对各器件的典型测试结果进行了整理和分析，为今后天馈线系统设计、制造、调试，提供了理论基础和实验数据．     

地表水中两种藻类应急检测方法

本文通过对2h快速藻类检测方法、多参数水质分析仪测定与藻类经典检测方法的比较,提出了水中藻类的两种应急检测方法。     

基于Adriano控制器的寻线智能车设计

以飞思卡尔模型C车为车载平台,基于Adriano开发环境,采用红外线传感器进行路径检测,设计了一种寻线智能车.该智能车主要包括微控制器(MCU)模块、电机及驱动模块、舵机模块、路径识别模块.通过系统软、硬件的调试,小车能够稳定的沿引导轨迹运行,行驶效果良好,验证了系统设计可行性.     

破解响尾蛇导弹的奥秘

响尾蛇,是一种凶猛的毒蛇。响尾蛇的捕食方法与众不同,它是以特殊的红外感应系统捕食猎物的。红外线是一种电磁波,当物体温度高于绝对零摄氏度时会产生红外线。在电磁光谱中,红外线介于可见光与无线电波和雷达波之间,能透过非金属物质传至外界。响尾蛇一旦发现可疑红外线,就会迅速跟踪,然后迅速作出决断。一旦它觉得是可口的猎物,就会迅速发动袭击。     

步态参数的测试

随着生物医学工程的发展，对人体步行过程中步态各参数的测试提出了越来越高的要求，本文着重介绍了目前国内外步态参数测试的各种方法，详细论述了作者采用微机新技术所设计的步态分析仪，测试结果表明，该仪器能实现实时测量人体步行过程中步态各参数，与传统的测试方法相比较，其各项指标都有较大的提高。     

眨眼睛就能操控电器的耳朵开关

这种叫做“耳朵开关”的小玩意儿，外观和一般耳机无异，但它内建一组红外线感应器，能侦测耳朵内部因 表情变化产生的微小动作。使用者只要伸个舌头，就能开关iPod（音乐数码播放器）。眼睛睁大，就可以跳到下一首歌；眨眨右眼，就能回到上一首。使用者也能自定各种不同表情的程序，例如扭鼻子或微笑。