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The Mechanics and Trajectory Control in Locust Jumping

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Journal of Bionic Engineering 2013年第2期10卷 194-200页

作者： longbao han Zhouyi Wang Aihong Ji Zhendong Dai Institute of Bio-Inspired Structure and Surface Engineering Nanjing University of Aeronautics and Astronauties Nanjing 210016 P. R. China China International Engineering Consulting Corporation Beijing 100048 P. R. China

Locusts （Locusta migratoria manilensis） are characterised by their flying ability and abiding jump ability. Research on the jumping mechanics and behavior of locusts plays an important role in elucidating the mechanism of hexapod locomotion. The jump gestures of locusts were observed using high-speed video camera at 250 fps. The reaction forces of the hindlegs were measured using two three-dimensional sensors, in case the two hindlegs attached on separated sensor plates. The jump gestures and reaction forces were used to illustrate the locust jumping mechanism. Results show that the trajectory control is achieved by rapid rolling and yawing movements of the locust body, caused by the forelegs, midlegs and hindlegs in different jumping phases. The final jump trajectory was not determined until hind tarsi left platform. The horizontal co-impulse between two hindlegs might play a key role in jump stability and accuracy. Besides, the angle between two hindlegs affects the control of jump trajectory but has a little effect on the elevation angle of a jump, which is controlled mechanically by the initial position of the hindlegs. This research lays the groundwork for the probable design and development ofbiomimetic robotics.

关键词： locust hindleg reaction force elevation angle jump trajectory

Corrigendum to ＂The Mechanics and Trajectory Control in Locust Jumping＂ [Journal of Bionic Engineering, 2013, 10, 194-200]

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Journal of Bionic Engineering 2014年第2期11卷 322-323页

作者： longbao han Zhouyi Wang Aihong Ji Zhendong Dai Institute of Bio-inspired Structure and Surface Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China China International Engineering Consulting Corporation Beijing 100048 P. R. China

This communication gives the corrigendum to the paper ＂The Mechanics and Trajectory Control in Locust Jumping＂, Journal of Bionic Engineering, 2013, 10, 194-200. doi： 10.1016/S1672-6529（13）60215-2

关键词： Mechanics Trajectory Control Locust Jumping

Multicopy quantum state discrimination

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Science China(Physics,Mechanics & Astronomy) 2012年第1期55卷 60-65页

作者： ZhanG WenHai YU longbao YANG Ming ZhuoLiang Department of Physics Huainan Normal University Huainan 232038 China Department of Physics and Electronic Engineering Hefei Teachers College Hefei 230061 China School of Physics and Material Science Anhui University Hefei 230039 China

In this paper, we study the problem of multicopy quantum two-state discrimination. By exploring the quantum hypothesis testing, i.e., the probabilisfic quantum cloning, we derive the upper bounds of the minimal error discrimination （MED） and the optimal unambiguous discrimination （OUD）, which coincides with the Helstrom theorem and the JS limit. Furthermore, when prior probabilities are unknown, we derive the minimax MED and the minimax OUD. Based on the optimal NM probabilistic quantum cloning, we present the optimal strategies of collective measurements of the MED and the OUD. When the number of the copies is infinite, regardless of whether prior probabilities are known or not, the success probabilities of the MED and the OUD go to 100%, in accordance with the quantum measurement hypothesis that unknown quantum state can be determined if and only if infinite identical quantum state copies are given.

关键词： quantum state discrimination Helstrom theorem JS limit minimal error discrimination (MED) optimal unambiguousdiscrimination (OUD)

Quantum cloning with multicopy in d-dimensions

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Science China(Physics,Mechanics & Astronomy) 2011年第12期54卷 2217-2224页

作者： ZhanG WenHai YU longbao YANG Ming CAO ZhuoLiang Department of Physics Huainan Normal University Huainan 232038 China Department of Physics and Electronic Engineering Hefei Teachers College Hefei 230061 China School of Physics and Material Science Anhui University Hefei 230039 China

The explicit transformations of the 1→ 3 optimal universal quantum cloning and the optimal phase-covariant quantum cloning in d-dimensions are presented, and the dimensionalities of their ancillary systems are both d-dimensions. As d→∞ , their clone fidelities move toward 1/3, showing a classical limit for the fidelity of quantum cloning. Based on the reduction of the unitary transformation of quantum cloning, the transformation of the 1→M=d+1 optimal economical phase-covariant quantum cloning in d-dimensions is derived, and the clone fidelity is covered by the theoretical value.

关键词： quantum cloning universal quantum cloning phase-covariant quantum cloning economical phase-covariant quantum cloning

Optical scheme for realization of optimal unambiguous state discrimination of the JS limit

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Science China(Physics,Mechanics & Astronomy) 2013年第3期56卷 606-609页

作者： ZhanG WenHai YU longbao CAO ZhuoLiang YE Liu Department of Physics Huainan Normal University Department of Physics and Electronic Engineering Hefei Normal University School of Physics and Material Science Anhui University

We exploit optimal probabilistic cloning to rederive the JS *** on the formulation given by the optimal probabilistic cloning,the explicit transformation of a measure of the JS limit is *** on linear optical devices,we propose an experimentally feasible scheme to implement the JS limit measure of a general pair of two nonorthogonal quantum *** success probability of the proposed scheme is unity.

关键词： quantum state discrimination optimal unambiguous discrimination JS limit optimal probabilistic quantum cloning

Geometric measure of quantum discord and the geometry of a class of two-qubit states

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Science China(Physics,Mechanics & Astronomy) 2013年第4期56卷 737-744页

作者： SONG Wei YU longbao DONG Ping LI DaChuang YANG Ming CAO ZhuoLiang School of Electronic and Information Engineering Hefei Normal University Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China School of Physics and Material Science Anhui University

We investigate the geometric picture of the level surfaces of quantum entanglement and geometric measure of quantum discord(GMQD) of a class of X-states, respectively. This pictorial approach provides us a direct understanding of the structure of entanglement and GMQD. The dynamic evolution of GMQD under two typical kinds of quantum decoherence channels is also investigated. It is shown that there exists a class of initial states for which the GMQD is not destroyed by decoherence in a finite time interval. Furthermore, we establish a factorization law between the initial and final GMQD, which allows us to infer the evolution of entanglement under the influences of the environment.

关键词： geometric measure of quantum discord geometric picture two-qubit states

Simulation of the spin-boson model with superconducting phase qubit coupled to a transmission line

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Science China(Physics,Mechanics & Astronomy) 2012年第9期55卷 1557-1561页

作者： YU longbao TONG NingHua XUE ZhengYuan WANG ZiDan ZHU ShiLiang Laboratory of Quantum Information Technology and School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 China School of Electronic and Information Electronic Engineering Hefei Normal University Hefei 230601 China Department of Physics Renmin University of China Beijing 100872-China Department of Physics and Center of Theoretical and Computational Physics the University of Hong Kong Pokfulam Road Hong Kong China

Based on the rapid experimental developments of circuit QED,we propose a feasible scheme to simulate the spin-boson model with superconducting circuits,which can be used to detect quantum Kosterlitz-Thouless(KT) phase *** design the spinboson model by using a superconducting phase qubit coupled to a semi-infinite transmission line,which is regarded as a bosonic reservoir with a continuum *** tuning the bias current or the coupling capacitance,the quantum KT transition can be directly detected through tomography measurement on the states of the phase *** also estimate the experimental parameters using the numerical renormalization group method.

关键词： spin-boson model superconducting qubit quantum phase transition numerical renormalization group method

Interfacial morphologies between iron and Ag-Cu-Sn alloy

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Chinese Science Bulletin 1999年第16期44卷 1463-1466页

作者： Hong Li Haifeng Zhang longbao Wang Guangjie Zhai Bingzhe Ding Zhenhong Mai Zhuangqi Hu Chinese Acad Sci Inst Met Res State Key Lab Rapidly Solidified Nonequilibrium A Shenyang 110015 Peoples R China Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China

A series of experiments have been designed to investigate the effect of different space positions between liquid Ag-Cu-Sn alloy drop and iron substrates on the liquid/solid inter-facial morphologies by a sessile drop method. The results show that Ag-Cu-Sn alloy diffuses into the solid iron substrate, and the amounts are greater and the distances are longer when it dif-

关键词： liquid/solid interface diffusion α-Fe dendrite.

FBG Arrays for Quasi-Distributed Sensing: A Review

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Photonic Sensors 2021年第1期11卷 91-108页

作者： Chengli LI Jianguan TANG Cheng CHENG longbao CAI Minghong YANG National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of TechnologyWuhan430070China

Fiber Bragg grating (FBG) array is a powerful technique for quasi-distributed sensing along the entire length of sensing fiber with fast response and high precision. It has been widely used for temperature, strain, and vibration monitoring. In this review work, an overview on the recent advances of FBG arrays is conducted. Firstly, the fabrication methods of FBG array are reviewed, which include femtosecond laser system and online writing technique. Then, the demodulation techniques for FBG arrays are presented and discussed. Distributed static sensing can be performed by demodulating wavelength shift of each FBG, while phase demodulation techniques with low noise are employed for dynamic vibration sensing. Simultaneous distributed dynamic and static sensing system based on FBG array is also outlined. Finally, possible future directions are discussed and concluded. It is believed that the FBG array has great development potential and application prospect.

关键词： FBG array on-line writing FBG wavelength demodulation phase demodulation