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amplitude-Phase Modulation, Topological Horseshoe and Scaling Attractor of a Dynamical System

Communications in Theoretical Physics 2016年第9期65卷 297-305页

作者：李春来李文张敬谢元喜赵益波 College of Physics and Electronics Hunan Institute of Science and Technology Yueyang 414006 China School of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing 210044 China Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Nanjing Nanjing 210044 China

A three-dimensional autonomous chaotic system is discussed in this paper. Some basic dynamical properties of the system, including phase portrait, Poincar′e map, power spectrum, Kaplan–Yorke dimension, Lyapunov exponent spectra, signal amplitude and topological horseshoe are studied theoretically and numerically. The main finding by analysis is that the signal amplitude can be modulated via controlling the coefficients of the linear term, cross-product term and squared term simultaneously or respectively, and the phase of x3 can be modulated by the product of the coefficients of the linear term and cross-product term. Furthermore, scaling chaotic attractors of this system are achieved by modified projective synchronization with an optimization-based linear coupling method, which is safer for secure communications than the existed synchronization scheme since the scaling factors can be regarded as the security encoding key.

关键词： signal amplitude signal phase topological horseshoe scaling attractor

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Charge resolution in the isochronous mass spectrometry and the mass of ^(51)Co

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Nuclear Science and Techniques 2021年第4期32卷 30-37页

作者： Xu Zhou Meng Wang Yu-Hu Zhang Hu-Shan Xu You-Jin Yuan Jian-Cheng Yang Yu.A.Litvinov S.A.Litvinov Bo Mei Xin-Liang Yan Xing Xu Peng Shuai Yuan-Ming Xing Rui-Jiu Chen Xiang-Cheng Chen Chao-Yi Fu Qi Zeng Ming-Ze Sun Hong-Fu Li Qian Wang Tong Bao Min Zhang Min Si Han-Yu Deng Ming-Zheng Liu Ting Liao Jin-Yang Shi Yu-Nan Song Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China GSI Helmholtzzentrum fu¨r Schwerionenforschung Planckstraße 164291 DarmstadtGermany Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Science Xi’an Jiaotong UniversityXi’an 710049China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China CNRS/IN2P3 IJCLabUniversite´Paris-Saclay91405 OrsayFrance

Isochronous mass spectrometry(IMS)of heavyion storage rings is a powerful tool for the mass measurements of short-lived *** IMS experiments,masses are determined through precision measurements of the revolution times of the ions stored in the ***,the revolution times cannot be resolved for particles with nearly the same mass-to-charge(m/q)*** overcome this limitation and to extract the accurate revolution times for such pairs of ion species with very close m/q ratios,in our early work on particle identification,we analyzed the amplitudes of the timing signals from the detector based on the emission of secondary ***,the previous data analysis method is further improved by considering the signal amplitudes,detection efficiencies,and number of stored ions in the ring.A sensitive Z-dependent parameter is introduced in the data analysis,leading to a better resolution of ^(34)Ar^(18+) and ^(51)Co^(27+) with A/Z=17/*** mean revolution times of ^(34)Ar^(18+) and ^(51)Co^(27+) are deduced,although their time difference is merely 1.8 *** uncorrected,overlapped peak of these ions has a full width at half maximum of 7.7 *** mass excess of ^(51)Co was determined to be-27;332e41T keV,which is in agreement with the previous value of-27;342e48T keV.

关键词： Isochronous mass spectrometry Charge resolution signal amplitude Micro-channel plate ^(51)Co

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The application of Gaussian distribution deconvolution method to separate the overlapping signals in the 2D NMR map

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Petroleum Science 2023年第3期20卷 1513-1520页

作者： Kou-Qi Liu Zheng-Chen Zhang Mehdi Ostadhassan Institute of Energy Peking UniversityBejing100871China Instituteof Gscienes Marineand Land Gmechanics and GeoeconicsChiian Abrech-Universitat KielGmay Department of Geology Ferdowsi University of MashhadMashadIran

The 2D NMR(T_(1)-T_(2))mapping technique,which can be used to separate different proton populations from various sources(hydroxyls,solid organic matter,free water,and free HC)has gained attention in petroleum *** separate proton contributions,a fixed straight line is commonly employed to separate different regions representing proton sources on the ***,some of these regions(Region 1 and 2)might overlap which makes extracting the NMR signal amplitude from these regions *** order to solve this issue,in this study,we applied the Gaussian distribution deconvolution method to separate the T_(1)and T_(2)relaxation distributions and then derived the signal amplitude of each region instead of following the common fixed line ***,we employed this method to analyze several shale samples from the literature and compared the results following both methods to verify our ***,samples from the Bakken Shale were studied to separate signals from Region 1 and Region 2 and corelated the results with geochemical properties that were obtained from programmed(Rock Eval)*** demonstrated an improvement in their relation when our approach is employed compared to the fixed line technique to differentiate signal from overlapping *** means the Gaussian distribution deconvolution method can be used with confidence to provide us with more accurate petrophysical and geochemical understanding of complex formations.

关键词： 2D NMR signal amplitude Gaussian distribution Shale formations

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Detection of rice seed vigor by low-field nuclear magnetic resonance

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International Journal of Agricultural and Biological Engineering 2018年第6期11卷 195-200页

作者： Ping Song Peng Song Hongwei Yang Tao Yang Jing Xu Kaitian Wang College of Information and Electrical Engineering Shenyang Agricultural UniversityShenyang 110866China Beijing Research Center for Information Technology in Agriculture Beijing 10097China National Research Center of Intelligent Equipment for Agriculture Beijing 10097China

A new method to predict the seed vigor of rice was developed to control adulteration during the seed trading process and to address the deficiencies of traditional manual detection ***-field nuclear magnetic resonance(LF-NMR)technique was used to detect the vigor of rice *** varieties(Beijing-1,Qianchonglang-2,Yanfeng-47 and Shennong-265)of rice seeds from the Rice Research Institute of Shenyang Agricultural University were chosen for the *** transverse relaxation time T_(2),T_(21) and T_(22) were observed in the *** peak start time of free water(transverse relaxation time T_(22)),signal amplitude of bound water(transverse relaxation time T_(21)),and moisture content decreased with the decrease in the vigor of the *** were no obvious trends observed for the top of the peak and the end point of the transverse relaxation time T_(22).In addition,the start,top,and end time of the peak(transverse relaxation time T_(21)),and the signal amplitude of bound water showed no consistent *** results indicated that LF-NMR could be used as a method to distinguish the vigor of rice seeds *** study provided theoretical basis and technical support for the rapid detection of rice seed vigor.

关键词： nondestructive detection nuclear magnetic resonance transverse relaxation time signal amplitude rice seeds vigor

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