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Quantum properties of nonclassical states generated by an optomechanical system with catalytic quantum scissors

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Chinese Physics B 2023年第1期32卷 311-318页

作者：李恒梅杨保华袁洪春许业军 school of Information engineering Changzhou Vocational Institute of Mechatronic TechnologyChangzhou 213164China school of Electrical and Information engineering Changzhou Institute of TechnologyChangzhou 213032China school of mechanical and Electronic engineering Chizhou UniversityChizhou 247000China

A scheme is proposed to investigate the non-classical states generated by a quantum scissors device(QSD) operating on the the cavity mode of an optomechanical system. When the catalytic QSD acts on the cavity mode of the optomechanical system, the resulting state contains only the vacuum, single-photon and two-photon states depending upon the coupling parameter of the optomechanical system as well as the transmission coefficients of beam splitters(BSs). Especially, the output state is just a class of multicomponent cat state truncations at time t = 2π by choosing the appropriate value of coupling parameter. We discuss the success probability of such a state and the fidelity between the output state and input state via QSD. Then the linear entropy is used to investigate the entanglement between the two subsystems, finding that QSD operation can enhance their entanglement degree. Furthermore, we also derive the analytical expression of the Wigner function(WF) for the cavity mode via QSD and numerically analyze the WF distribution in phase space at time t =2π. These results show that the high non-classicality of output state can always be achieved by modulating the coupling parameter of the optomechanical system as well as the transmittance of BSs.

关键词： optomechanical system quantum scissors device quantum state engineering linear entropy

One-pot Synthesis of Hierarchical Flower-like WS_(2) Microspheres as Anode Materials for Lithium-ion Batteries

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Journal of Wuhan University of technology(Materials Science) 2024年第1期39卷 1-6页

作者：张向华 TAN Hen WANG Ze XUE Maoquan school of mechanical engineering Jiangsu University of TechnologyChangzhou 213001China school of Materials engineering Jiangsu University of TechnologyChangzhou 213001China changzhou Vocational institute of Industry technology Changzhou 213164China

3D hierarchical flowerlike WS_(2) microspheres were synthesized through a facile one-pot hydrothermal *** as-synthesized samples were characterized by powder X-ray powder diffraction (XRD),energy-dispersive spectroscopy (EDS),scanning electron microscopy (SEM) and *** images of the samples reveal that the hierarchical flowerlike WS_(2) microspheres with diameters of about 3-5μm are composed of a number of curled *** tests such as charge/discharge,cyclic voltammetry,cycle life and rate performance were carried out on the WS_(2) *** an anode material for lithium-ion batteries,hierarchical flowerlike WS_(2) microspheres show excellent electrochemical *** a current density of100 mA·g^(-1),a high specific capacity of 647.8 mA·h·g^(-1) was achieved after 120 discharge/charge *** excellent electrochemical performance of WS_(2) as an anode material for lithium-ion batteries can be attributed to its special 3D hierarchical structure.

关键词： WS_(2) microspheres lithium-ion batteries electrochemical performance

Formation and mechanical properties of bulk Cu-Ti-Zr-Ni metallic glasses with high glass forming ability

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中国有色金属学会会刊：英文版 2007年第1期17卷 16-20页

作者：杨英俊康福伟邢大伟孙剑飞沈庆克沈军 school of Materials Science and engineering Harbin Institute of Technology Department of mechanical engineering Aviation University of Air Force

Bulk amorphous Cu52.5Ti30Zr11.5Ni6 and Cu53.1Ti31.4Zr9.5Ni6 alloys with a high glass forming ability can be quenched into single amorphous rods with a diameter of 5 mm, and exhibit a high fracture strength of 2 212 MPa and 2 184 MPa under compressive condition, respectively. The stress—strain curves show nearly 2% elastic strain limit, yet display no appreciable macroscopic plastic deformation prior to the catastrophic fracture due to highly localized shear bands. The present work shows clearly evidence of molten droplets besides well-developed vein patterns typical of bulk metallic glasses on the fracture surface, suggesting that localized melting induced by adiabatic heating may occur during the final failure event.

关键词：金属玻璃成形能力机械性能绝热升温合金

Experimental Investigation of fluid-structure interaction of composite hydrofoils in cavitating flow

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Journal of Hydrodynamics 2022年第2期34卷 207-213页

作者： Hou-sheng Zhang Zhi-pu Guo Qin Wu Han-zhe Zhang Guo-yu Wang school of mechanical engineering Beijing Institute of TechnologyBeijing100081China aviation engineering school Air Force Engineering UniversityXian710038China

This paper experimentally studies the cavitating fluid-structure interaction of composite hydrofoils with different ply *** synchronous measurement system with high-speed camera and for laser Doppler vibrometer(LDV),the feedback pressure regulation system,and the flow rate control system are *** experimental results of the cavitation evolution show that,compared with the rigid hydrofoil,the composite hydrofoils with+45°ply angle and 0°ply angle accelerate the cavitation inception,and the composite hydrofoil with−45°ply angle delays the cavitation *** the same cavitation number,the cloud cavitation of the+45°laminated hydrofoil is the most severe,followed by that of the 0°laminated hydrofoil,and that of the−45°laminated hydrofoil is relatively weak and close to that of the rigid *** analyses of the structural vibration of the composite hydrofoils in different cavitation stages show that the three composite hydrofoils have no significant vibration at the incipient cavitation and the supercavitation,but relatively significant vibration is observed in the sheet and cloud *** vibration amplitude of the composite hydrofoil with+45°ply angle is the largest,followed by those of the−45°,0°laminated *** the sheet cavitation,the dominant frequencies of the structural vibration velocity of the+45°laminated hydrofoil and the−45°laminated hydrofoil are the first and second modal frequencies,but no explicit dominant frequency is observed for the 0°laminated *** the cloud cavitation,the dominant frequencies of the three composite hydrofoils mainly include the first modal frequency,the second modal frequency,and the cavity shedding frequency.

关键词： Cavitation fluid-structure interaction composite hydrofoil cavity induced vibration

New operator identities with regard to the two-variable Hermite polynomial by virtue of entangled state representation

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Chinese Physics B 2013年第6期22卷 162-165页

作者：袁洪春李恒梅许雪芬 College of Optoelectronic engineering Changzhou Institute of Technology school of Science Changzhou Institute of Technology school of Mathematics and Physics Jiangsu Teachers University of Technology

By virtue of the entangled state representation we concisely derive some new operator identities with regard to the two-variable Hermite polynomial （TVHP）. By them and the technique of integration within an ordered product （IWOP） of operators we further derive new generating function formulas of the TVHP. They are useful in quantum optical theoretical calculations. It is seen from this work that by combining the IWOP technique and quantum mechanical representations one can derive some new integration formulas even without really performing the integration.

关键词： two-variable Hermite polynomial entangled state representation operator identities

A thermo-viscoelastic model for particle-reinforced composites based on micromechanical modeling

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Acta Mechanica Sinica 2021年第3期37卷 402-413,I0001页

作者： Yang Chen Xiaohao Shi Zhenqiang Zhao Zaoyang Guo Yulong Li school of Civil aviation Northwestern Polytechnical UniversityXi’an 710072China institute of Biomedical engineering and Health Sciences Changzhou UniversityChangzhou 213164China school of Science Harbin Institute of TechnologyShenzhen 518055China

Micromechanics-based constitutive models offer superior ability to estimate the effective mechanical properties for the composites,which greatly promote the computational efficiency in the multiscale analysis for composite *** this work,a thermo-viscoelastic model for particle-reinforced composites is proposed to estimate their thermal-mechanical coupling behaviors in terms of a micromechanics-based homogenization method in the time *** matrix and particles of the composites are modeled as“thermo-rheologically complex”viscoelastic *** temperature-dependent effective elastic strain energy ratios of particle to composite are proposed to evaluate the contributions of the matrix and *** thermo-viscoelastic model for the composites is then formulated by superposing the matrix and particle’s *** element simulations based on the representative volume element models are employed to validate the constitutive model under various thermal-mechanical coupling *** effects of the loading rate,viscous parameter and particle content on the effective thermal-mechanical responses of the composites are also comprehensively *** experimental data from literature are also employed to verify the constitutive *** findings show that the proposed thermo-viscoelastic model can accurately predict the thermal-mechanical coupling behaviors for the particle-reinforced composites.

关键词： Particle-reinforced composites Thermo-viscoelastic model Thermal-mechanical coupling Homogenization method Numerical validation

Effect of initial orientation on microstructure and mechanical properties of AZ31 Mg alloy sheets via accumulated extrusion bonding

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Progress in Natural Science:Materials International 2023年第2期33卷 178-184页

作者： Xia Cao Tingzhuang Han Ji Xu Guangsheng Huang Hua Zhang Jianhui Bai Fusheng Pan Department of Mechanics and Surface engineering Changzhou Institute of Technology Department of aviation Manufacturing engineering Changzhou Institute of Technology State Key Laboratory of Solidification Processing School of Materials Science & Engineering Northwestern Polytechnical University State Key Laboratory of mechanical Transmission College of Materials Science and Engineering Chongqing University institute for Advanced Studies in Precision Materials Yantai University

In this study, effects of initial orientation on microstructure evolution and mechanical properties of AZ31 Mg alloy sheets via accumulated extrusion bonding(AEB) was systematically studied. The samples with RD and TD parallel to extrusion direction(ED) were labeled as RED and TED, respectively. RD and TD pieces alternately stacked was named as RTED. The results revealed that under three-dimensional compressive stress, {10-12} tensile twinning dominated the first stage deformation in container. As the plunger continuous press down, dynamic recrystallization(DRX) occurred, and the newly fine DRXed grains along original and twin grain boundaries gradually consumed the matrix and twin grains. The microstructure was completely transformed into recrystallized grain structure at sizing band with an average grain size of ～0.9 μm in TED sample, smaller than that of RED *** the alloys extruded out of the die, DRXed grains significantly grew to ～4.5 μm and 3.5 μm for RED and TED samples, respectively. A laminated microstructure was obtained with average grain sizes of～4.4 μm in RD layers and 3.5 μm in TD layers for RTED sample. The AEB processed samples exhibited an ED-tilt double-peak basal texture with similar texture intensity. The tensile tests results indicated that attributed to the combined effect of grain refinement and texture evolution, the yield strength and fracture elongation of RED and TED samples was significantly improved. The heterogeneous microstructure in RTED sample induced an extra work hardening(HDI-work hardening) in tensile deformation and resulted in a further improved elongation of 32.0%.

关键词： Magnesium alloy Accumulated extrusion bonding Initial orientation Microstructure Texture mechanical properties

Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400℃

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Journal of Materials Science & technology 2024年第5期172卷 71-82页

作者： Xiang Su Yuan Lei Yang Chen Hongjie Qu Zhixiang Qi Gong Zheng Xu Liu Henggao Xiang Guang Chen National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China school of aviation and mechanical engineering Changzhou Institute of TechnologyChangzhou 213032China

Heat-resistant aluminum alloys are widely used in aerospace and automotive fields for manufacturing hot components due to their advantages in lightweight design and energy ***,the high-temperature strength of existing cast aluminum alloys is always limited to about 100 MPa at 350℃due to coarsening and transformation of strengthening ***,we reveal that the yield strength and ultimate tensile strength of the T6 state Al-8.4Cu-2.3Ce-1.0Mn-0.5Ni-0.2Zr alloy at 400◦C increase by 34%and 44%after re-aging at 300℃for 100 h,and its thermal strength exhibits distinguished ad-vantage over traditional heat-resistant aluminum *** enhanced elevated-temperature strength is attributed to the reprecipitation of the Ni-bearing T-Al_(20)Cu_(2)Mn_(3)phase,whose number density increases over one *** significant segregation of Ni,Ce,and Zr elements at the interfaces helps improve the thermal stability of the T *** thermostable T phase effectively strengthens the matrix by in-hibiting dislocation ***,a highly interconnected 3D intermetallic network along the grain boundaries can still remain after long-term re-aging at 300℃,which is conducive to imposing a drag on the grain boundaries at high *** finding offers a viable route for enhancing the elevated-temperature strength of heat-resistant aluminum alloys,which could provide expanded opportunities for higher-temperature applications.

关键词： Aluminum alloys Precipitation Thermally reinforcement phase Re-aging treatment High-temperature strength

New ANCF solid-beam element:relationship with Bézier volume and application on leaf spring modeling

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Acta Mechanica Sinica 2021年第8期37卷 1318-1330,I0003页

作者： Zuqing Yu Yaqi Cui College of mechanical and Electrical engineering Hohai UniversityChangzhou 213022China school of Mechatronics engineering Harbin Institute of TechnologyHarbin 150001China

An eight-node solid-beam element based on absolute nodal coordinate formulation(ANCF)which uses cubic interpolation at the longitudinal direction and linear at the transverse direction is *** element can accurately discretize the geometry represented by the Bézier volume with the same basis function *** continuity property of the proposed beam element is *** of the proposed element can be found in the application of leaf spring *** parabolically varying thickness of the leaf can be accurately *** in leaf spring such as the spring eye and the rubber bushing can be assembled efficiently since the proposed element can be connected at any *** ANCF reference node is used to represent the rigid components and the revolute joints in the vehicle suspension *** I-shaped cross-section cantilever beam and flexible pendulum model are used to test the accuracy and dynamic performance of the proposed solid-beam *** leaf spring model shows the flexibility of the element in modeling the complex mechanical system and the balance between the accuracy and the efficiency.

关键词： Solid-beam element Leaf spring Integration of computer aided design and analysis Absolute nodal coordinate formulation Multibody system dynamics