Three-phase Pupil Localization Method in Non-ideal Eye Images

Pupil localization is a very important preprocessing step in many reel applications. Accurate and robust pupil localization in non-ideal eye images is a challenging task. A detailed method of pupil localization in non-ideal eye images is proposed. This method is implemented in three main phases： first, segment the rough pupil region based on Gaussian Mixture Model： then modify the rough segmentation result using morphological method to minimize the influence of some disturbing factors; last estimate the pupil parameters based on minimizing the least square error. The proposed method is first tested on CASIA iris image dataset, and then on our self-captured iris dataset which contains a wider variety of iris images. Experiments show that the proposed method can perform well for nonideal eye images of various qualities.     

催化荧光法测定人发中痕量锰

研究了 pH 为4.8的 HAc—NaAc 缓冲体系中高碘酸钾氧化罗丹明6G、锰(Ⅱ)催化、氨三乙酸活化的催化反应,建立了一个催化荧光法测定痕量锰的新方法.线性范围为3.3～25ng/25mL.检出限为3.3ng/25mL,用于发样中痕量锰的测定,结果满意.     

铜的新显色反应的研究

本文研究了6-Br-BTACP与Cu~(2+)离子的显色反应,在0—19μg/10ml范围内服从比耳定律,表现摩尔吸光系数ε(582)=4.01×10~4。     

黄曲霉毒素B1测定方法的探讨

对VicamV1系列4型荧光计测定法和薄层层析法检验食品中黄曲霉毒素B1的操作方法及其结果进行了探讨，结果显示：前者比后者操作更简便、安全、准确。     

人工栽培胀果甘草中黄酮类化合物的提取与分析

采用冷浸乙醇提取法对兰州人工引种栽培的6年生胀果甘草(Glycyrrhiza inflata Batal)根中总黄酮和总皂甙类化合物进行了提取分离与含量分析, 并且采用重量法和3种紫外 可见分光光度法对胀果甘草根中总黄酮含量进行了测定和比较分析. 研究表明, 3种分光光度测定方法中, 黄酮含量以直接测定法为最高, 氯化铝显色法次之, 硝酸铝显色法最低; 直接测定法测定样品中的黄酮含量因不受显色剂干扰, 测定结果相对更为准确可靠.     

Simple Synchronous Fluorimetric Method for Determination of Benzo[a] pyrene in Airborne Particulates without a Pre-Separation Procedure

A sensitive analytical method, constant-energy synchronous fluorimetry, has been used to determine benzo[a]pyrene （BaP） selectively in airborne particulates （AP）. A constant-energy difference of 1 400 cm^-1 was selected for obtaining single spectral peak. The method could easily identify BaP in an 18-component polycylic aromatic hydrocarbons（PAHs） mixtures. Calibration plots in methanol solution and in sodium dodecylsulfate （SDS） micellar media show a good linearity （R〉0.999） in the BaP concentration range generally fotund in the environment. The method gives a detection limit of 0.40 nmol/L in SDS micellar medium and 1.34 nmol/L in methanol solution.     

壳聚糖脱乙酰度酸碱滴定测定法的初步改进

对壳聚糖脱乙酰度酸碱滴定测定法进行了研究、比较和初步的改进，改进后的方法既降低了样品用量、缩短了测定时间，又使滴定便于徒手操作，更利于实际应用。     

U-Pb dating of zircons from quartz diorite and its enclaves at Tongguanshan in Anhui and its petrogenetic implication

The Tongling area, Anhui Province lies in the centralpart of the Cu-Fe-Au mineralization belt of the Mid-dle-Lower Yangtze River region, and hosts the highestincidence of this mineralization belt. Geotectonically, theTongling area is located at the middle of the Lower Yang-tze fold belt in the Yangtze block. Silurian to Triassicshallow marine carbonatite and a few semi-abyssal sili-ceous rocks, continental-ocean arenites are the dominantoutcropping strata. A series of NE trending fold s…