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Optical Free-Induction Decay Effect in a Λ-Type Quantum-Beat Three-Level System

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Chinese Physics Letters 1997年第5期14卷 352-355页

作者： cao Zhuo-liang Department of Physics Anhui UniversityHefei 230039

With Bloch form,a coherent transient effect-optical free-induction decay is studied semiclassi-cally in theΛ-type three-level system driven by a coherent microwave *** decay behavior has three contributions:a homogeneous part with transverse relaxation time and two inhomo-geneous parts with different time constants that reflect the velocity bandwidth excited and the action of the driving microwave field.

关键词： field. decay coherent

The first mitogenome of the Nile pufferfish Tetraodon lineatus from Lake Turkana in East Africa:new insights into the genus

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Journal of Oceanology and Limnology 2020年第2期38卷 490-502页

作者： cao liang SONG Xuelin ZHANG E Institute of Hydrobiology Chinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China Sino-Africa Joint Research Center Chinese Academy of SciencesWuhan 430074China

A complete mitogenome of *** from Lake Turkana in the Kenyan part was *** had a length of 16470 bp,including 37 genes as found in teleosts with the typical gene order in these *** comparison and phylogenetic analysis supported not only the morphology-based recognition of the puf ferfish specimen from Lake Turkana as the Nile puf ferfish,but also the identification of the Chinese specimen recently recorded as *** and its African *** mitochondrial genome here amplified for the sample of *** from Lake Turkana also provides conclusive molecular evidence for the monophyletic nature of Tetraodon s.s.,as it serves as a reference genome of this species used to clarify ambiguity in its identification in previous molecular studies.

关键词： Tetraodon lineatus Kenya mtDNA phylogenetic analysis

Study on modulation techniques free of orthogonality restriction

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Science in China(Series F) 2007年第6期50卷 889-896页

作者： cao QiSheng liang DeQun Department of Information Engineering Dalian Maritime University Dalian 116026 China

The Nyquist rate is a limit of transmission for traditional modulation methods from orthogonality restriction. Nonorthogonal modulation techniques （NMT） is proposed, which removes the orthogonality restriction, and as a result, higher bandwidth ef- ficiency than the traditional methods can be achieved. First, the symbol error rate of NMT is introduced by using estimation theory. Then the relation between bandwidth efficiency and signal to noise ratio is discussed. Finally, a design instance of NMT is present and numerical experiment is made. This study explores for new modulation methods and points out a widened direction for modulation theory and applications.

关键词： digital communications Nyquist rate nonorthogonality bandwidth efficiency

Observer-based adaptive consensus control for nonlinear multi-agent systems with time-delay

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Science China(Information Sciences) 2020年第3期63卷 195-211页

作者： Wenbin XIAO liang cao Hongyi LI Renquan LU School of Automation and Guangdong Province Key Laboratory of Intelligent Decision and Cooperative Control Guangdong University of Technology

In this paper, we consider the observer-based adaptive consensus tracking problem for a class of nonlinear time-delay multi-agent systems in the presence of input saturation. Under the assumption that the communication topology is directed and connected, a distributed adaptive consensus controller is developed based on the dynamic surface control technique. By constructing the nonlinear observer, the unmeasurable agents dynamics can be estimated. Input saturation problem is solved by a smooth function combined with an auxiliary variable. With the help of prescribed performance functions, the synchronization errors converge to the prescribed sets, which are characterized as a neighborhood of zero. According to Lyapunov stability theory, it is shown that with the proposed distributed consensus tracking approach, the consensus errors are cooperatively semi-globally uniformly ultimately bounded. Finally, a simulation example is provided to show the effectiveness of the proposed algorithm.

关键词： adaptive consensus control multi-agent systems prescribed performance time-delay unmeasurable states

Observer-based adaptive fuzzy output constrained FTC for nonlinear interconnected large-scale systems

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Science China(Information Sciences) 2020年第1期63卷 253-255页

作者： Guowei DONG liang cao Hongyi LI School of Automation and Guangdong Province Key Laboratory of Intelligent Decision and Cooperative Control Guangdong University of Technology

Dear editor,The problem of fault usually cannot be ignored in actuator control systems. Once the faults are unresolved, the stability and dynamic performance of controlled systems are incapable of being guaranteed. Accordingly, some fault-tolerant control(FTC) methods for nonlinear systems have been proposed on the basis of a backstepping framework [1].

关键词： Observer-based adaptive fuzzy output constrained FTC for nonlinear interconnected large-scale systems FTC

Effects of Re on surface eutectic formation for Ni-base single crystal superalloys during directional solidification

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Journal of Materials Science & Technology 2017年第11期33卷 1308-1313页

作者： liang cao Yizhou Zhou Tao Jin Xiaofeng Sun Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Effects of Re on the formation of surface eutectics have been investigated by using Ni-base single crystal superalloys with different Re additions. It was found that Re promotes the segregation of Al and Ta to the eutectic melt, leading to an increase of the surface and internal eutectics. In addition, the addition of Re also increased the freezing range, the local solidification time, and the permeability of the dendritic network within the mushy zone. These factors ultimately promoted the outflow of the interdendritic residual liquid with the action of solidification shrinkage, and led to the formation of more surface eutectics. In contrast, the addition of Re had no obvious influence on the surface eutectic microstructures.

关键词： Surface eutectic Re addition Single crystal Superalloy

Experimental and analytical studies on the vibration serviceability of long-span prestressed concrete floor

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 417-428页

作者： cao liang Liu Jiepeng Li Jiang Zhang Ruizhi School of Civil Engineering Chongqing University Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University) Ministry of Education

An extensive experimental and theoretical research study was undertaken to study the vibration serviceability of a long-span prestressed concrete floor system to be used in the lounge of a major ***,jumping impact tests were carried out to obtain the floor’s modal parameters,followed by an analysis of the distribution of peak *** tests were also performed to capture the acceleration *** prestressed concrete floor was found to have a low fundamental natural frequency（≈8.86 Hz）corresponding to the average modal damping ratio of≈2.17%.A coefficients plate with simply-supported *** calculated analytical results（natural frequencies and root-mean-square acceleration）agree well with the experimental *** analytical approach is thus validated.

关键词： vibration serviceability prestressed concrete floor airport lounge theoretical analysis modal superposition method

Scheme for Entanglement Generation of Two Atoms in Two Bad Cavities

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Communications in Theoretical Physics 2008年第3期49卷 595-598页

作者： ZHANG Li-Hua cao Zhuo-liang Department of Physics Anqing Teachers College Anqing 246011 China Anhui Key Laboratory of Information Material and Devices School of Physics and Materials Science Anhui University Hefei 230039 China

We present a scheme for generation of two-atomic entangled state by using the interference of polarized photons. The scheme does not require complete mapping between the atomic state and the photonic state, nor does it require the establishment of maximal entanglement between the atom and the cavity. And the atom-cavity coupling strength is smaller than the cavity decay rate. This greatly relaxes the requirement on the cavity quality. The scheme is for non-post-selection results and all the steps of the scheme are within the current technologies.

关键词： entangled state cavity QED

Teleportation of an Unknown Atomic Entangled State Without Any Joint Bell-state Measurement via a Cluster State

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Communications in Theoretical Physics 2008年第2期49卷 369-372页

作者： cao Zhuo-liang LI Da-Chuang Key Laboratory of Opto-electronic Information Acquisition and Manipulation Ministry of Education and School of Physics and Material Science Anhui University Hefei 230039 China The School of Scinece Nangzhou Dianzi University Hangzhou 310018 China

An experimentally feasible scheme for teleportation of an unknown two-atom entangled state is proposed. Our scheme uses a duster state as the quantum channel, where we do not need any joint Bell-state measurement. Moreover the successful probability and fidelity of teleportation can both reach 1.0. The current scheme can be realized within the current experimental technology.

关键词： quantum teleportation joint Bell-state measurement cavity QED quantum controlled phase gate