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虹膜的身份识别在国际上已成为一个研究的热点领域,本文初步探索了基于小波包分解的虹膜图像识别处理技术,实验结果表明基于小波包分解的虹膜图像识别方法是有效的。 相似文献
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虹膜的身份识别在国际上已成为一个研究的热点领域。本文主要比较了虹膜特征提取和匹配的几种主要算法,分别说明了Gabor变换、傅里叶变换和小波变换的优点与不足,并指出相对而言,小波变换更适合应用在虹膜图像的识别中。 相似文献
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目的 研究幼年脊柱关节病伴发复发性虹膜睫状体炎的临床特点。 方法 收集确诊的幼年脊柱关节病伴发复发性虹膜睫状体炎 14例病人的临床资料 ,分析其临床表现特点。 结果 幼年脊柱关节病伴发复发性虹膜睫状体炎与成年发病者临床特点不完全一样 ,易误诊。幼年脊柱关节病常未能早期诊断和及时全身药物治疗 ,导致虹膜睫状体炎反复发作。 结论 幼年脊柱关节病伴发复发性虹膜睫状体炎并不少见 ,容易误诊 ,需引起注意。临床上对儿童不明原因的复发性虹膜睫状体炎应考虑幼年脊柱关节病的可能 ,争取早期诊断和全身药物治疗 ,防止虹膜睫状体炎反复发作。 相似文献
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赵毓棠 《中国科学院研究生院学报》1992,30(2):181-182
One new species of the genus Iris(Iridaceae), Iris Psammocola Y.T.Zhao, is des-cribed from Ningxia Autonomoeus Region, China. 相似文献
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本文借助光学显微镜和扫描电镜，对我国产鸢尾属Iris L．32种植物的花粉形态进行
了观察。该属植物的花粉为舟形或近球形。萌发孔可分为远极单沟、远极单沟-拟沟、二合
沟及无萌发孔等类型。外壁主要为网状纹饰，少数具瘤状或鼓槌状纹饰。本文依据花粉形态 和其它器官特征，对本属花粉外壁及萌发孔的演化趋势及某些种的分类地位进行了探讨。 相似文献
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本文对鸢尾属Iris 22个种(基本上包括了各个亚属的代表)及其近缘属植物射干属Belamcanda的
射干 B．chinensis(L．)DC．进行了根茎的异黄酮类成分的比较分析研究。结果表明,鸢尾属植物和射干
中普遍具有异黄酮类成分,这是它们的特征性成分之一。根据化学成分的特征,鸢尾属可以分为两大类
群：只含异黄酮甙元的类群和既含异黄酮甙又含甙元的类群。从化学成分的分布特征来看,无附属物亚
属subgen．Limniris只含异黄酮甙元,是一个比较自然的类群。鸡冠状附属物亚属subgen．Crossiris,除小
花鸢尾 I．speculatrix Hance外,是一个较自然的类群。野鸢尾亚属subgen．Pardanthopsis和射干属的成分
非常相似,有着密切的亲缘关系,是鸢尾属中原始的类群。从化学成分特征来看,野鸢尾亚属与琴瓣鸢
尾亚属subgen．Xyridion、鸡冠状附属物亚属、须毛状附属物亚属subgen．Iris都有着一定的联系。根据化
学成分、孢粉学、细胞学等特征,认为：华夏鸢尾I．cathayensis Migo和长白鸢尾I．mandshurica Maxim．为无附属物亚属与须毛状附属物亚属两亚属之间的过渡类型。小花鸢尾是无附属物亚属向鸡冠状附属物亚属过渡的中间类型。扁竹兰I．confusa Sealy和扇形鸢尾I．wattii Baker可能是同一个种。 相似文献
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Ana Nikler Helena i
ak Danijela Bejuk Vanja Radi&#x;i&#x; Biljak Ana-Maria &#x;imundi&#x; 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2022,32(1)
IntroductionThe aims of study were to assess: 1) performance specifications of Atellica 1500, 2) comparability of Atellica 1500 and Iris, 3) the accuracy of both analysers in their ability to detect bacteria.Materials and methodsCarryover, linearity, precision, reproducibility, and limit of blank (LoB) verification were evaluated for erythrocyte and leukocyte counts. ICSH 2014 protocol was used for estimation of carryover, CLSI EP15-A3 for precision, and CLSI EP17 for LoB verification. Comparison for quantitative parameters was evaluated by Bland-Altman plot and Passing-Bablok regression. Qualitative parameters were evaluated by Weighted kappa analysis. Sixty-five urine samples were randomly selected and sent for urine culture which was used as reference method to determine the accuracy of bacteria detection by analysers.ResultsAnalytical specifications of Atellica 1500 were successfully verified. Total of 393 samples were used for qualitative comparison, while 269 for sediment urinalysis. Bland-Altman analysis showed statistically significant proportional bias for erythrocytes and leukocytes. Passing-Bablok analysis for leukocytes pointed to significant constant and minor proportional difference, while it was not performed for erythrocytes due to significant data deviation from linearity. Kappa analysis resulted in the strongest agreements for pH, ketones, glucose concentrations and leukocytes, while the poorest agreement for bacteria. The sensitivity and specificity of bacteria detection were: 91 (59-100)% and 76 (66-87)% for Atellica 1500 and 46 (17-77)% and 96 (87-100)% for Iris.ConclusionThere are large differences between Atellica 1500 and Iris analysers, due to which they are not comparable and can not be used interchangeably. While there was no difference in specificity of bacteria detection, Iris analyser had greater sensitivity. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献