小波分析在活体浮游植物离散三维荧光光谱特征提取及识别中的应用研究

为了区分和识别不同属的浮游植物,选择了Daubechies-3小波的二阶低频分量对10种浮游植物的离散三维光谱进行了特征提取.Bayes判别分析结果表明此类特征谱对不同属间浮游植物的正确判别率可达96.75%.利用非负最小二乘法,依据此类特征谱建立的标准谱库可对加入不同噪声的某些藻进行100%的定性识别.可对绝大多数混合样中优势种进行定性识别;并可使某些优势种的识别量达到真实量的75% 以上.小波分析可对浮游植物在属的层次上进行有效的特征提取.     

Iterative technique for analysis and design of circular leaky‐wave antenna for the 2.45‐GHz radio‐frequency identification applications

This paper suggests a new miniaturized antenna for radio‐frequency identification (RFID) applications of 2.45 GHz. Our structure consists of a circular microstrip patch antenna which incorporates two concentric annular slots is printed on a multilayer substrates. The bandwidth, one of the most important characteristics of antenna, can be significantly improved by using a multilayer dielectric configuration. we aim by this study to show that the effect of radiating structure loaded by annular rings for the patch size reduction as well as the advantage of this structure being to create a circular polarisation in the direction of maximal radiation pattern. The wave concept iterative procedure is used to analyse this new antenna. Using the proposed procedure, less computing time and memory are needed to calculate the electromagnetic parameters of our design. The validation of the results of our developed model was verified with known commercial software called “CST Microwave Studio Software” followed by an experimental test. According to the reached results, we can judge that our new design antenna is suitable for RFID applications in the 2.45 GHz band.