一类新超混沌系统及其自同步   总被引：2，自引：0，他引：2  

高智中 《常熟理工学院学报》2011,25(8):31-34

基于一个三维混沌系统构造了一个新的四维超混沌系统,利用系统的分岔图、Lyapunov指数谱图和相图分析方法研究了该系统的运动规律．根据线性系统稳定性定理,设计了一种非线性反馈控制器,实现了该超混沌系统的自同步,数值模拟结果验证了理论分析的正确性．  相似文献   

取代基酞菁铜的合成与表征     

夏道成  姚纪欢  韩双  马会宣  刘慧景 《雁北师范学院学报》2011,27(2)

首先以3,6-二羟基邻苯二甲腈和氯代正丁烷为起始反应物,在无水碳酸钾的催化作用下,经亲核取代反应,在DMF（N,N-二甲基甲酰胺）溶剂中合成了中间配体3,6-二丁氧基邻苯二腈,再以此配体和氯化亚铜为前体,采用DBU液相催化法合成了周边烷氧基取代的1,4,8,11,15,18,22,25-八丁氧基酞菁铜,经过元素分析、红外、荧光、紫外可见光谱和原子吸收表征证明,产物就是目标化合物取代基酞菁铜。  相似文献   

Getting good at small talk: student-directed learning of social conversation skills     

Veerle Garrels 《欧洲特需教育杂志》2019,34(3):393-402

For students with autism spectrum disorders (ASD), learning social skills is an intricate but essential task to facilitate social inclusion and participation. Limited research is available on social skills interventions for adolescents with ASD and intellectual disabilities (ID). This article presents a case study that illustrates how the Self-Determined Learning Model of Instruction was used to improve self-chosen social conversation skills in a Norwegian 14-year old student with ASD and mild ID. This case study illustrates that, also for students with ASD and ID, giving them the opportunity to set personally relevant goals may improve their autonomous motivation, thereby increasing the likelihood of goal attainment.  相似文献   

噪声环境中基于DTW的说话人识别     

张飞云  张鹏  高建生 《许昌学院学报》2011,30(5):68-72

在VC++环境下,提取PLAR特征参数,基于听觉特性和语谱特性的语音增强器作为预处理器,对语音信号首先进行降噪处理,建立了基于DTW的抗噪声说话人识别系统.实验结果表明,即使在信噪比比较低的情况下,该系统都会在一定程度上提高多种噪声环境下说话人识别系统的识别性能.  相似文献   

浅谈对专业化舞台灯光的认识     

伊天夫  叶皛 《演艺科技》2020,(1):13-17

结合多个灯光设计案例,阐述对专业化舞台灯光的认识,包括如何推动高品质、高质量的专业化舞台灯光发展,当代灯光技术进步对灯光设计师提出的新要求、对灯光设备及灯光厂家的要求等。  相似文献   

荧光光谱学中的表面活性剂     

田江红 《天水师范学院学报》2004,24(5):31-33

综述近年来在表面活性剂中荧光光谱学的发展,以及表面活性剂对荧光物质的增溶、增敏机理。展望了今后表面活性剂应用于荧光光谱研究的发展方向。  相似文献   

平谱射电类星体3C 454.3射电谱指数的演化研究     

蒋思涵  周晓珊  彭坤 《科教文汇》2015,(18)

从各类文献和资料中搜集到平谱射电类星体3C 454.3在射电22GHz和37GHz波段25年来的观测数据。我对这两个波段的时间和流强进行了处理和分析,得到了相应的谱指数,并分析讨论了流强和时间,谱指数和时间,谱指数和流强之间的关系,发现它们之间存在着一定的相关性。  相似文献   

An efficient method of addressing ectopic beats: new insight into data preprocessing of heart rate variability analysis     

Wen F  He FT 《Journal of Zhejiang University. Science. B》2011,12(12):976-982

Heart rate variability (HRV) analysis is affected by ectopic beats. An efficient method was proposed to deal with the ectopic beats. The method was based on trend correlation of the heart timing signal. Predictor of R-R interval (RRI) value at ectopic beat time was constructed by the weight calculation and the slope estimation of preceding normal RRI. The type of ectopic beat was detected and replaced by the predictor of RRI. The performance of the simulated signal after ectopic correction was tested by the standard value using power spectrum density (PSD) estimation, whereas the results of clinical data with ectopic beats were compared with the adjacent ectopic-free data. The result showed the frequency indexes after ectopy corrected had less error than other methods with the test of simulated signal and clinical data. It indicated our method could improve the PSD estimation in HRV analysis. The method had advantages of high accuracy and real time properties to recover the sinus node modulation.  相似文献   

论中国少数民族服饰中蕴含的图腾文化     

曲义 《蒙自师范高等专科学校学报》2015,(4):14-15

针对我国少数民族服饰中的图腾文化,介绍了图腾文化的源流,论述了图腾在服饰上的物态化体现及常见的物态化手段,分析了服饰图腾的缤纷化特征,以及在不同民族和相同民族的不同支系两个层面上的含义,并以动物图腾中常见的老虎、公牛、神鹰、犬、蛇和青蛙为例,归纳了常见共用图腾纹样及其共有民族,总结出服饰图腾纹样的广谱化特征。  相似文献   

Social Story™ interventions for decreasing challenging behaviours: a single-case meta-analysis 1995–2012     

Ryan J. McGill  Diana Baker  R.T. Busse 《Educational Psychology in Practice》2015,31(1):21-42

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