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汽车侧偏角估计方法比较

南京理工大学学报 2009年第1期33卷 122-126,131页

作者：林棻赵又群南京航空航天大学车辆工程系江苏南京210016

针对汽车质心侧偏角难以直接获取的问题,提出了基于径向基神经网络与驾驶员-汽车闭环系统相结合的侧偏角估计方法。把汽车侧偏角看作横摆角速度和侧向加速度时间序列的映射,采用均匀设计方案对训练样本进行优选,通过神经网络建立三者之... 详细信息

针对汽车质心侧偏角难以直接获取的问题,提出了基于径向基神经网络与驾驶员-汽车闭环系统相结合的侧偏角估计方法。把汽车侧偏角看作横摆角速度和侧向加速度时间序列的映射,采用均匀设计方案对训练样本进行优选,通过神经网络建立三者之间的映射关系。同时设计了一种改进自适应卡尔曼滤波算法,将其运用到相同道路输入下汽车侧偏角的估计当中。对两种方法进行了基于实车试验的比较:神经网络方法的估计误差均值和标准差分别为0.046333°、0.057 822;°自适应卡尔曼滤波方法的估计误差均值和标准差分别为0.062 745°、0.089 241°。研究结果可以为汽车稳定性控制系统估计器的设计提供理论指导。

关键词：汽车侧偏角径向基函数神经网络自适应卡尔曼滤波状态估计

Synthesis of α-Oxoketene CyclicO,S and S,S Acetals

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Chemical Research in Chinese Universities 1994年第4期10卷 369-372页

作者： LIU qun XU Bai-ling zhao Hong-wu Department of Chemistry Northeast Normal UniversityChangchun130024

Ｓｙｎｔｈｅｓｉｓｏｆα－ＯｘｏｋｅｔｅｎｅＣｙｃｌｉｃＯ，ＳａｎｄＳ，ＳＡｃｅｔａｌｓＬＩＵＱｕｎ，ＸＵＢａｉ－ｌｉｎｇａｎｄＺＨＡＯＨｏｎｇ－ｗｕ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＮｏｒｔｈｅａｓｔＮ... 详细信息

Ｓｙｎｔｈｅｓｉｓｏｆα－ＯｘｏｋｅｔｅｎｅＣｙｃｌｉｃＯ，ＳａｎｄＳ，ＳＡｃｅｔａｌｓＬＩＵＱｕｎ，ＸＵＢａｉ－ｌｉｎｇａｎｄＺＨＡＯＨｏｎｇ－ｗｕ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＮｏｒｔｈｅａｓｔＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，Ｃ...

关键词： ?Oxoketene cyclic O S and S S acetals Synthesis

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基于虚拟试验的路面附着系数估计

吉林大学学报（工学版） 2011年第2期41卷 309-315页

作者：赵又群林棻南京航空航天大学车辆工程系南京210016

将滑模观测器和卡尔曼滤波器相结合对汽车轮胎纵向力进行了估计,在此基础上采用带遗忘因子的递推最小二乘算法和CUSUM变化检测算法对路面附着系数进行了估计。通过在ADAMS/Car中的路面编辑器构造具有不同附着系数的路面测试环境,不仅验... 详细信息

将滑模观测器和卡尔曼滤波器相结合对汽车轮胎纵向力进行了估计,在此基础上采用带遗忘因子的递推最小二乘算法和CUSUM变化检测算法对路面附着系数进行了估计。通过在ADAMS/Car中的路面编辑器构造具有不同附着系数的路面测试环境,不仅验证了提出的方法对不同附着条件下的路面进行附着系数估计的可靠性和有效性,而且还表明slip-slope理论在ADAMS/Car的虚拟试验中同样可以再现。

关键词：车辆工程附着系数轮胎纵向力滑模观测器递推最小二乘法虚拟试验

Determination of hydroxyl radicals in TiO2/Ti photoelectrocatalytic oxidation system using Fe（phen）3^2＋ spectrophotometry

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Journal of Environmental Sciences 2006年第1期18卷 158-161页

作者： JIANG Yan-li LIU Hui-ling WANG qun-hui JIANG zhao-hua Department of Environmental Engineering Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China School of Life Science and Chemistry Harbin University Harbin 150086 China

A new method of determining the cumulate concentration of hydroxyl radicals in the TiO2/Ti photoelectrocatalytic（PEC） oxidation system was established by o-phenanthroline-Fe（Ⅱ）（Fe（phen）3^2＋） spectrophotometry and using anion exchange membrane. Fe （phen）3^2＋ can be oxidized to o-phenanthroline-Fe（Ⅲ）（Fe（phen）3^3＋） by strong oxidization of hydroxyl radicals（·OH）. Then the cumulate concentration of hydroxyl radicals can be calculated through determining the change of the Fe（phen）3^3＋ absorbency at 509 nm. In addition, the research results showed the production rate of hydroxyl radicals was affected obviously by pH of solution, the cumulate concentration of hydroxyl radicals was the largest at nearby the initial pH 6.3 （isoelectric point）, and the change direction of pH after illumination tended to nearby isoelectric point.

关键词： TiO2 / Ti catalyst photoelectrocatalysis o-phenanthroline-Fe hydroxyl radical anion exchange membrane

Incidence and clinical treatment of hypertriglyceridemic acute pancreatitis:A few issues

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World Journal of Clinical Cases 2023年第2期11卷 479-481页

作者： qun-Ying Yang Qian zhao Jian-Wen Hu Department of Gastroenterology Dongyang People's HospitalDongyang 322100Zhejiang ProvinceChina

Hypertriglyceridemia is a well-recognized etiology of acute pancreatitis,and the incidence of hypertriglyceridemic acute pancreatitis(HTG-AP)has increased in frequency worldwide in response to lifestyle *** is crucial to identify hypertriglyceridemia as the cause of pancreatitis and initiate appropriate *** treatment produces effective lowering of triglycerides,but in our opinion,non-diabetic patients with HTG-AP require separate consideration to avoid hypoglycemia.

关键词： Hypertriglyceridemic acute pancreatitis Incidence Etiology Insulin Treatment

Identification of reservoir types in deep carbonates based on mixedkernel machine learning using geophysical logging data

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Petroleum Science 2024年第3期21卷 1632-1648页

作者： Jin-Xiong Shi Xiang-Yuan zhao Lian-Bo Zeng Yun-zhao Zhang Zheng-Ping Zhu Shao-qun Dong Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education Yangtze UniversityWuhan4310HubeiChina School of Geosciences Yangtze UniversityWuhan430100HubeiChina College of Geosciences China University of Petroleum(Beijing)Beijing102249China Petroleum Exploration and Production Research Institute of SINOPEC Beijing100083China School of Earth Sciences and Engineering Xi'an Shiyou UniversityXi'an 710065ShaanxiChina

Identification of reservoir types in deep carbonates has always been a great challenge due to complex logging responses caused by the heterogeneous scale and distribution of storage *** cross-plot analysis and empirical formula methods for identifying reservoir types using geophysical logging data have high uncertainty and low efficiency,which cannot accurately reflect the nonlinear relationship between reservoir types and logging ***,the kernel Fisher discriminant analysis(KFD),a kernel-based machine learning technique,attracts attention in many fields because of its strong nonlinear processing ***,the overall performance of KFD model may be limited as a single kernel function cannot simultaneously extrapolate and interpolate well,especially for highly complex data *** address this issue,in this study,a mixed kernel Fisher discriminant analysis(MKFD)model was established and applied to identify reservoir types of the deep Sinian carbonates in central Sichuan Basin,*** MKFD model was trained and tested with 453 datasets from 7 coring wells,utilizing GR,CAL,DEN,AC,CNL and RT logs as input *** particle swarm optimization(PSO)was adopted for hyper-parameter optimization of MKFD *** evaluate the model performance,prediction results of MKFD were compared with those of basic-kernel based KFD,RF and SVM ***,the built MKFD model was applied in a blind well test,and a variable importance analysis was *** comparison and blind test results demonstrated that MKFD outperformed traditional KFD,RF and SVM in the identification of reservoir types,which provided higher accuracy and stronger *** MKFD can therefore be a reliable method for identifying reservoir types of deep carbonates.

关键词： Reservoir type identification Geophysical logging data Kernel Fisher discriminantanalysis Mixedkernel function Deep carbonates

Antioxidative Effect of Schiff Bases with o-Hydroxybenzylidene Groupon Free Radical Induced Hemolysis of Human Red Blood Cell

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Chemical Research in Chinese Universities 2002年第3期18卷 287-289页

作者： LUO Xu yang zhao Jian zhang LIN Ying jie LIU Zai qun College of Chemistry Jilin UniversityChangchun 130023P.R.China

The hemolysis of human red blood cells was initiated by a water soluble free radical initiator, 2,2′ azobis (2 amidinopropane hydrochloride)(AAPH), at 37 ℃ in phosphate buffered saline(pH=7.4). The respective addition of 1 [ N (o hydroxybenzylidene)amino]tetradecane(TDCA), 1,2 di[ N (o hydroxybenzylidene)amino]cyclohexane(DACH), 4 [ N (o hydroxybenzylidene)amino]benzoic acid(PABA), 4 nitro[ N (o hydroxybenzylidene)]aniline(APNA) or N (o hydroxybenzylidene)aniline(APA) can all prolong the inhibition period of hemolysis, indicating that the above Schiff bases play an antioxidative role in free radical induced hemolysis. It can be concluded that Schiff base with an alkyl group or a conjugated system in the molecule protect red blood cells against free radical induced hemolysis efficiently. This information may be useful for antioxidant drug design.

关键词： Red blood cell Hemolysis Schiff base Free radical

Diffeomorphic Registration of 3D Surfaces with Point and Curve Landmarks

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Communications in Mathematics and Statistics 2024年第3期12卷 505-522页

作者： Yi-Jun Yang Yu-Ming zhao Li-qun Yang Wei Zeng Xi’an Jiaotong University Xi’anPeople’s Republic of China Shandong University QingdaoPeople’s Republic of China China Nanhu Academy of Electronics and Information Technology CNAEIT JiaxingPeople’s Republic of China

This paper proposes a novel method to compute the diffeomorphic registration of 3D surfaces with point and curve feature *** the surfaces are mapped to the canonical domain by a curve constrained harmonicmap,where the landmark curves are straightened to line segments and their positions and inclining angles are determined intrinsically by the surface geometry and its curve ***,the canonical domains are registered by aligning the corresponding point and straight line segments using the dynamic quasiconformal map(DQCM),which introduces the combinatorial diagonal switches to the quasiconformal optimization such that the resultant map is *** end points of the source curve landmarks are mapped to their corresponding points on the target surface,while the interior points of the source curves can slide on the corresponding target curves,which provides more freedom for the surface registration than the point-based registration *** on the real surfaces with point and curve landmarks demonstrate the efficiency,efficacy and robustness of the proposed method.

关键词： Surface registration Harmonic map Dynamic quasiconformal map Feature landmarks

Comparison of Algorithms for an Electronic Nose in Identifying Liquors

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Journal of Bionic Engineering 2008年第3期5卷 253-257页

作者： Zhi-biao Shi Tao Yu qun zhao Yang Li Yu-bin Lan School of Energy Resources and Mechanical Engineering Northeast Dianli University Jilin 132012 P. R. China School of Chemistry Engineering Northeast Dianli University Jilin 132012 P. R. China School of Electrical Engineering Northeast Dianli University Jilin 132012 P. R. China Aerial Application Technlogy usDA-ARS-SPARC-APMRU Co）lege Station TX 77845 USA

When the electronic nose is used to identify different varieties of distilled liquors, the pattern recognition algorithm is chosen on the basis of the experience, which lacks the guiding principle. In this research, the different brands of distilled spirits were identified using the pattern recognition algorithms （principal component analysis and the artificial neural network）. The recognition rates of different algorithms were compared. The recognition rate of the Back Propagation Neural Network （BPNN） is the highest. Owing to the slow convergence speed of the BPNN, it tends easily to get into a local minimum. A chaotic BPNN was tried in order to overcome the disadvantage of the BPNN. The convergence speed of the chaotic BPNN is 75.5 times faster than that of the BPNN.

关键词： electronic nose liquor algorithm principal component analysis