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Prescribed-time stabilisation control of differential driven automated guided vehicle

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IET Cyber-Systems and Robotics 2023年第1期5卷 143-153页

作者： Qiyuan Chen Pengfei Zhang School of Engineering Huzhou UlniversityHuzhouZhejiangChina

The position control problem of differential-driven automated guided vehicles(AGVs)based on the prescribed-time control method is studied.First,an innovative orientation error function is proposed by an auxiliary arcsine function about the orientation angle.Thus,the problem of position control of AGV is transformed into the stabilisation control of the kinematic system.Second,by introducing a reserved time parameter and a smooth switching function,a novel time-varying scaling function is proposed.This novel scaling function avoids the risk of infinite gain in the conventional prescribed-time control method while ensuring the smoothness of control laws.Then,an improved velocity constraint function is proposed using the Gaussian function.Compared with the existing constraint function,the proposed method not only has more smoothness but also solves the balance point errors caused by the large AGV orientation errors.The presented method ensures that the AGV reaches the target position in a prescribed time.Hence,the upper bound of the AGV system state can be determined by adjusting parameters.Matlab simulation results show that the proposed controller can effectively make the AGV system state satisfy the prescribed bound.

关键词： Automated guided vehicle kinematic system position control prescribed-time stabilisation

Fusion, fission, and annihilation of complex waves for the(2+1)-dimensional generalized Calogero–Bogoyavlenskii–Schiff system

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Chinese Physics B 2014年第6期23卷 118-122页

作者：朱维婷马松华方建平马正义朱海平 College of Science Lishui University

With the help of the symbolic computation system, Maple and Riccati equation （ξ＇ = ao ＋ a1ξ＋ a2ξ2）, expansion method, and a linear variable separation approach, a new family of exact solutions with q = lx ＋ my ＋ nt ＋ Г（x,y, t） for the （2＋1）-dimensional generalized Calogero-Bogoyavlenskii-Schiff system （GCBS） are derived. Based on the derived solitary wave solution, some novel localized excitations such as fusion, fission, and annihilation of complex waves are investigated.

关键词： Riccati equation expansion method GCBS system exact solutions fusion fission and annihilationof complex waves

Design and Optimization of Omnidirectional Band Gap for One-Dimensional Periodic and Quasiperiodic Phononic Heterostructures

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Chinese Physics Letters 2015年第1期32卷 87-90页

作者：陈赵江 department of Physics Zhejiang Normal University State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences

A new kind of one-dimensional multilayer phononie heterostructure is constructed to obtain a broad acoustic omnidirectional reflection （ODR） band. The heterostructure is formed by combining finite periodic phononic crystals （PnCs） and Fibonacci （or Thue-Morse） quasiperiodic PnCs. From the numerical results performed by the transfer matrix method, it is found that the ODR bands can be enlarged obviously by using the combination of periodic and quasi-periodic PnCs. Moreover, an application of particle swarm optimization in designing and optimizing acoustic ODR bands is reported. With regards to different thickness ratios and periodic numbers in the heterostructure, we give some optimization examples and finally achieve phononic heterostructure with a very broad ODR bandwidth. The result provides a new approach to achieve broad acoustic ODR bandwidth, and will be applied in design of omnidirectional acoustic mirrors.

关键词： ODR Design and Optimization of Omnidirectional Band Gap for One-Dimensional Periodic and Quasiperiodic Phononic Heterostructures

Adsorption of 1,3,5-Triphenylbenzene Molecules and Growth of Graphene Nanoflakes on Cu(100)Surface

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Chinese Physics Letters 2017年第11期34卷 66-70页

作者：刘巧云宋俊杰蔡亦良乔丹井立威何丕模张寒洁 department of Physics Zhejiang UniversityHangzhou 310027 School of Information Science and Engineering Ningbo Institute of TechnologyZhejiang UniversityNingbo 315100 department of fundamental and Social Science Zhejiang University of Water Resources and Electric PowerHangzhou 310018

Adsorption of 1,3,5-triphenylbenzene （TPB） molecules on Cu（100） surface is studied using ultraviolet photo- electron spectroscopy （UPS） and density functional theory （DFT） calculations. researches on the bottom-up fabrication of graphene nanoflakes （GNFs） with TPB as a precursor on the Cu（100） surface are carried out based on UPS and DFT calculations. Three emission features d, e and f originating from the TPB molecules are located at 3.095, 7.326 and 9.349 eV below the Fermi level, respectively. With the increase of TPB coverage on the Cu（100） substrate, the work function decreases due to the formation of interfacial dipoles and charge （electron） rearrangement at the TPB/Cu（100） interface. Upon the formation of GNFs, five emission characteristic peaks of g, h, i, j and k originating from the GNFs are located at 1.100, 3.529, 6.984, 8.465 and 9.606eV below the Fermi level, respectively. Angle resolved ultraviolet photoelectron spectroscopy （ARUPS） and DFT calculations indicate that TPB molecules adopt a lying-down configuration with their molecular plane nearly parallel to the Cu（100） substrate at the monolayer stage. At the same time, the lying-down configuration for the GNFs on the Cu（100） surface is also unveiled by ARUPS and DFT calculations.

关键词： TPB Adsorption of 1,3,5-Triphenylbenzene Molecules and Growth of Graphene Nanoflakes on Cu Surface

Low-Temperature Properties of CePt_3P Tuned by Magnetic Field

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Chinese Physics Letters 2019年第5期36卷 98-101页

作者：陈健吕柏江郑实益李玉科 zhejiang University of Water Resources and Electric Power zhejiang provincial Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang University department of Physics Hangzhou Normal University

We present low-temperature magnetization, magnetoresistance and specific heat measurements on the Kondo lattice compound CePt_3P under applied magnetic fields up to 9.0 T. At zero field, CePt_3P exhibits a moderately enhanced Sommerfeld coefficient of electronic specific heat γCe=86 mJ/mol·K^2 as well as two successive magnetic transitions of Ce 4f moments: an antiferromagnetic ordering at T_(N_1) = 3.0 K and a spin reorientation at T_(N_2)=1.9 K. The value of T_(N_1) shifts to lower temperature as magnetic field increases, and it is ultimately suppressed around B_c ～3.0 T at 1.5 K. No evidence of non-Fermi liquid behavior is observed around B_c down to the lowest temperature measured. Moreover, γ decreases monotonously with increasing the magnetic field. On the other hand, the electrical resistivity shows an anomalous temperature dependence ρ∝T^n with the exponent n decreasing monotonously from ～2.6 around B_c down to ～1.7 for B = 9.0 T. The T-B phase diagram constructed from the present experimental results of CePt_3P does not match the quantum criticality scenario of heavy fermion systems.

关键词： Low-Temperature Properties of CePt3P Tuned by Magnetic Field AFM MMT QCP

CRE Method for Solving m Kd V Equation and New Interactions Between Solitons and Cnoidal Periodic Waves

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Communications in Theoretical Physics 2015年第1期63卷 7-9页

作者：焦向莉楼森岳 Faculty of Science Ningbo University Shanghai Key Laboratory of Trustworthy Computing East China Normal University

In nonlinear physics, the modified Korteweg de-Vries(m Kd V) as one of the important equation of nonlinear partial differential equations, its various solutions have been found by many methods. In this paper, the CRE method is presented for constructing new exact solutions. In addition to the new solutions of the m Kd V equation, the consistent Riccati expansion(CRE) method can unearth other equations.

关键词： mKdV方程 CRE 相互作用周期波孤子求解非线性物理偏微分方程

Efficient Excitation of a Symmetric Collective Atomic State with a Single-Photon Through Dipole Blockade

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Communications in Theoretical Physics 2013年第3期59卷 365-369页

作者：洪方昱熊诗杰傅景礼朱志艳 department of Physics Center for Optoelectronics Materials and DevicesZhejiang Sci-Tech UniversityXiasha College Park National Laboratory of Solid State Microstructures and department of Physics Nanjing University

In the famous quantum communication scheme developed by Duan et al.[L.M.Duan,M.D.Lukin,J.I.Cirac,and P.Zoller,Nature(London) 414(2001) 413],the probability of successful generating a symmetric collective atomic state with a single-photon emitted have to be far smaller than 1 to obtain an acceptable entangled state.Based on strong dipole-dipole interaction between two Rydberg atoms,two simultaneous excitations in an atomic ensemble are greatly suppressed,which makes it possible to excite a mesoscopic cold atomic ensemble into a near-ideal singly-excited symmetric collective state accompanied by a signal-photon with near unity success probability.

关键词：偶极相互作用单光子发射集体激发原子态对称封锁原子状态成功概率

Mechanisms and applications of antitumor immunotherapy of responsive drug-loaded nanoparticles in breast cancer

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BIOCELL 2023年第7期47卷 1483-1498页

作者： LETIAN JIN HETING CHEN QI RUAN RUI LIU yIFENG FAN XIUFANG XU DAJIANG WANG JIAHUI LU School of Medical Imaging Hangzhou Medical CollegeHangzhou310053China

During the chemotherapy of tumors,the cytotoxic effect of drugs is vital to kill tumor cells,and the delivery of a chemotherapeutic agent is of great importance for optimal therapeutic effects.The high in vivo clearance rate and low delivery efficiency of conventional chemotherapeutic agents affect the therapeutic effect.In recent years,the responsive drug delivery nanosystem has received increasing concern owing to its excellent biocompatibility,stable delivery performance,and controlled drug release strategies.To lucidly explain the cytocidal and immunotherapeutic effects of such responsive nanosystems in breast cancer,this review discusses the various stimuli and responses of drug-loaded liposomal nanosystems.The light/magnetic response of drug-loaded bionic membranes nanosystems and the heat/magnetic response of drug-loaded iron oxide nanosystems are also elaborated.Their cancer cell-killing efficacy and antitumor immunotherapeutic effects are also scrutinized.

关键词： Responsive nanoparticles Antitumor immunotherapy Breast cancer

Interactions Between Solitons and Cnoidal Periodic Waves of the Boussinesq Equation

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Communications in Theoretical Physics 2013年第10期60卷 387-390页

作者：杨铎楼森岳余炜沣 Faculty of Science Ningbo University Shanghai Key Laboratory of Trustworthy Computing East China Normal University

The Boussinesq equation is one of important prototypic models in nonlinear physics.Various nonlinear excitations of the Boussinesq equation have been found by many methods.However,it is very difcult to find interaction solutions among diferent types of nonlinear excitations.In this peper,two equivalent very simple methods,the truncated Painlev′e analysis and the generalized tanh function expansion approaches,are developed to find interaction solutions between solitons and any other types of Boussinesq waves.

关键词： Boussinesq方程相互作用孤子 Painlevé分析周期波非线性物理模型非线性激发余弦