检索结果-南通市图书馆

基于图像小波包信息熵和遗传神经网络的气-液两相流流型识别

在线全文

学校读者我要写书评

暂无评论

核动力工程 2008年第1期29卷 115-120页

作者：周云龙陈飞孙斌东北电力大学吉林省吉林市132012

根据小波包变换能够将图像信号按不同尺度进行分解的特性,提出了基于图像小波包信息熵特征和遗传神经网络相结合的气-液两相流流型识别的新方法。该方法采用高速摄影系统获取水平管道内气-液两相流的流动图像,经过处理,对图像进行多分... 详细信息

根据小波包变换能够将图像信号按不同尺度进行分解的特性,提出了基于图像小波包信息熵特征和遗传神经网络相结合的气-液两相流流型识别的新方法。该方法采用高速摄影系统获取水平管道内气-液两相流的流动图像,经过处理,对图像进行多分辨率分析,提取小波包变换系数的信息熵特征,用主成分分析法降低特征维数构成特征矢量,作为流型样本对遗传神经网络进行训练,实现了对流动图像的流型智能化识别。结果表明:图像小波包信息熵特征可以很好地反映各流型之间的差异;遗传神经网络结合遗传算法和BP算法各自优点,具有收敛速度快、不易陷入局部极小的特性,网络识别率为100%。

关键词：流型识别图像处理小波包遗传神经网络

UV-curable Organic-inorganic Hybrid Films Based on Acrylated Polyester

在线全文

学校读者我要写书评

暂无评论

UV-curable Organic-inorganic Hybrid Films Based on Acrylated...

Control synthesis for polynomial nonlinear systems and application in attitude control

第三届世界粘接及相关现象大会暨北京粘接学会第十五届学术年会

作者： HE Jian-yun FANG sun ZONG Zhen-gang Beijing University of Chemical Technology Department of Polymer Engineering University of AkronOhio 44325USA

An UV-curable organic/inorganic hybrid films based on Acrylated polyester(AP) was prepared using the in-situ method of tetraethylorthosiline(TEOS) *** TEOS oligomers were prepared in presence of water and ethanol using hydrochloric acid as a *** TEOS oligomers were characterized using Si NMR and the acrylated polyester (AP) were characterized by MALDI-TOF mass spectra.A radical photoinitiator was added to the TEOS/AP formulation and the films were crosslinked via *** effects of TEOS oligomers on hybrid film properties such as tensile strength and elongation and thermal stability were investigated.

关键词： UV-curing organic-inorganic hybrid film nanomaterials acrylated polyester tetraethylorthosilicate(TEOS) oligomers

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第6期9卷 833-839页

作者： Chang-fei TONG Hui ZHANG You-xian sun Institute of Industrial Process Control Zhejiang University Hangzhou 310027 China

A method for positive polynomial validation based on polynomial decomposition is proposed to deal with control synthesis problems. Detailed algorithms for decomposition are given which mainly consider how to convert coefficients of a polynomial to a matrix with free variables. Then, the positivity of a polynomial is checked by the decomposed matrix with semidefinite programming solvers. A nonlinear control law is presented for single input polynomial systems based on the Lyapunov stability theorem. The control synthesis method is advanced to multi-input systems further. An application in attitude control is finally presented. The proposed control law achieves effective performance as illustrated by the numerical example.

关键词： Nonlinear control Attitude control Polynomial systems

The application of the entropy-based statistic for genomic association study of QTL

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2008年第3期35卷 183-188页

作者： Yang Xiang Yumei Li Zaiming Liu Zhenqiu sun College of Mathematics Central South University Changsha 410081 China School of Public Health Central South University Changsha 410078 China Mathematics Department of Huaihua College Huaihua 418000 China

An entropy-based statistic TpE has been proposed for genomic association study for disease-susceptibility locus. The statistic TpE may be directly adopted and/or extended to quantitative-trait locus （QTL）mapping for quantitative traits. In this article, the statistic TpE was extended and applied to quantitative trait for association analysis of QTL by means of selective genotyping. The statistical properties （the type I error rate and the power） were examined under a range of parameters and population-sampling strategies （e.g., various genetic models, various heritabilities, and various sample-selection threshold values） by simulation studies. The results indicated that the statistic TpE is robust and powerful for genomic association study of QTL. A simulation study based on the haplotype frequencies of 10 single nucleotide polymorphisms （SNPs） of angiotensin-I converting enzyme genes was conducted to evaluate the performance of the statistic TPE for genetic association study.

关键词： entropy quantitative-trait locus association analysis extreme sample

Preparation of N-Doped TiO_2-Loaded Halloysite Nanotubes and Its Photocatalytic Activity under Solar-Light Irradiation

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2015年第2期17卷 64-68页

作者： Cheng Zhilin sun Wei College of Chemistry and Chemical Engineering Yangzhou University

The N-doped TiO2-loaded halloysite nanotubes(N-Ti O2/HNTs) nanocomposites were prepared by using chemical vapor deposition method which was realized in autoclave. The photocatalytic activity of nanocomposites was evaluated by virtue of the decomposition of formaldehyde gas under solar-light irradiation. The XRD patterns verified that the anatase structured TiO2 was deposited on HNTs. The TEM images showed that the surface of HNTs was covered with nanosized TiO2 with a particle size of ca. 20 nm. The UV-vis spectra indicated that the N-Ti O2/HNTs presented a significant absorption band in the visible region between 400 nm and 600 nm. Under solar-light irradiation, the highest degradation rate of formaldehyde gas attained 90% after 100 min of solar-light irradiation. The combination of the photocatalytic property of TiO2 and the unique structure of halloysite would assert a promising perspective in degradation of organic pollutants.

关键词： photocatalytic activity halloysite nanotubes nitrogen-doped titanium dioxide

Metabolite target analysis of symptomatic gout based on human urine combined with pattern recognition technique

在线全文

学校读者我要写书评

暂无评论

Metabolite target analysis of symptomatic gout based on huma...

血清激肽释放酶6及脂联素与帕金森病患者认知功能障碍的相关性

西北地区第七届色谱学术报告会甘肃省第十二届色谱年会

作者： yun Liu Xiao-Ming sun Duo-Long Di Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province Lanzhou Institute of Chemical Physics Graduate University of the Chinese Academy of Sciences

It is commonly acknowledged that the development of gout is a multi-step process,from asymptomatic hyperuricemia,to acute gouty arthritis and intercritical gout,finally to chronic tophaceous gout[1-3]. The preliminary consequence in the development of gout is ***,hyperuricemia is not necessarily related to gout and as many as 42%of acute gout patients might have normal levels of serum uric acid[4,5]. Therefore,serum uric acid alone as evaluated indicator for clinical diagnosis is *** of novel biomarkers for gout diagnosis is highly desirable to prevent the destruction of joints caused by tophaceous gout. Metabolite target analysis was established for urine based on fifteen endogenous metabolisms by high performance liquid chromatography-diode array detector(HPLC-DAD).Pattern recognition techniques were performed in order to discover significant metabolites from 15 metabolites.

关键词： gout chemometrics metabolomics

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

中国实用神经疾病杂志 2025年第1期28卷 23-27页

作者：孙迎迎龚梦茜张伟梁晓倩孙超崔桂云徐州医科大学附属医院江苏徐州221000

目的探讨血清激肽释放酶6(KLK6)、脂联素(APN)与帕金森病患者认知功能障碍的相关性。方法选取徐州医科大学附属医院收治的112例帕金森病患者,依据认知功能障碍情况分为发生组(帕金森病合并认知障碍组,44例)和未发生组(帕金森病认知功能... 详细信息

目的探讨血清激肽释放酶6(KLK6)、脂联素(APN)与帕金森病患者认知功能障碍的相关性。方法选取徐州医科大学附属医院收治的112例帕金森病患者,依据认知功能障碍情况分为发生组(帕金森病合并认知障碍组,44例)和未发生组(帕金森病认知功能正常组,68例),采用酶联免疫吸附法检测血清KLK6、APN水平,比较2组血清KLK6、APN水平,相关性、影响因素、预测价值分别采用Pearson法、Logistic回归及受试者工作特征(ROC)曲线分析。结果Pearson相关性分析显示,血清KLK6、APN分别与MMSE评分、MoCA评分呈负、正相关(P<0.05)。Logistic回归分析显示,帕金森病程长、修订Hoehn-Yahr分级晚期、血清KLK6高水平均是影响帕金森病患者发生认知功能障碍的危险因素,血清APN高水平是其保护性因素(P<0.05)。ROC曲线分析显示,血清KLK6、APN水平联合预测的曲线下面积为0.960,灵敏度、特异度分别为90.91%、89.71%(P<0.05)。结论帕金森病合并认知功能障碍患者血清KLK6升高、APN降低,血清KLK6、APN不仅与认知功能相关,还是帕金森病患者发生认知功能障碍的影响因素,两者联合预测帕金森病认知功能障碍有较高的临床价值。

关键词：帕金森病认知功能障碍激肽释放酶6 脂联素相关性影响因素预测价值

Detection of the anthropogenic signal and urbanization effects in extreme temperature changes in eastern China

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2023年第2期16卷 55-62页

作者： Ying sun Ting Hu National Climate Center Laboratory for Climate StudiesChina Meteorological AdministrationBeijingChina Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjingChina

作为中国经济最发达的地区,中国东部受到城市热岛效应和温室气体排放等人类活动的明显影响.本文利用最新的观测和全球气候模式资料,对极端温度强度,频率和持续时间等16个极端温度指数进行了检测归因分析,研究了人为强迫和城市化效应对... 详细信息

作为中国经济最发达的地区,中国东部受到城市热岛效应和温室气体排放等人类活动的明显影响.本文利用最新的观测和全球气候模式资料,对极端温度强度,频率和持续时间等16个极端温度指数进行了检测归因分析,研究了人为强迫和城市化效应对中国东部极端温度变化的影响.结果表明,近年来极端温度持续增暖,极端暖事件增加,极端冷事件减少.新一代全球气候模式能够合理地反映这些变暖特征,但是部分模式可能高估或低估了观测到的变化.基于最优指纹方法的双信号检测表明,人为信号和城市化效应只能在暖夜和冷夜两个频率指标上同时被检测并分离,其变化约三分之二可归因于人类活动,剩余的三分之一可归因于城市化效应.而在极端温度其他指数的变化中,只有人类活动的影响能够被检测到.

关键词：城市化效应人为信号极端温度检测 CMIP6

Energy-to-peak control for a class of discrete stochastic fuzzy systems with time-delay

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2011年第4期9卷 624-628页

作者： Jianwei XIA Changyin sun School of Automation Southeast University Nanjing Jiangsu 210096 China School of Mathematics Science Liaocheng University Liaocheng Shandong 252000 China

This paper considers the problem of stochastic stabilization and energy-to-peak control for a class of discrete stochastic fuzzy systems with interval time-delays. The objective is to design a state feedback controller such that the closed-loop system is stochastic stable and satisfies energy-to-peak performance. Based on the idea of interval partitioning, some new sufficient conditions are presented in LMI.

关键词： Fuzzy systems Stochastic systems Energy-to-peak control Interval time-delay