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Tunable valley filter efficiency by spin-orbit coupling in silicene nanoconstrictions

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Chinese Physics B 2021年第5期30卷 589-594页

作者： Yi-Jian Shi Yuan-Chun Wang Peng-Jun Wang college of Electrical and Electronic Engineering Wenzhou UniversityWenzhou 325035China

Valley filter is a promising device for producing valley polarized current in graphene-like two-dimensional honeycomb lattice *** relatively large spin-orbit coupling in silicene contributes to remarkable quantum spin Hall effect,which leads to distinctive valley-dependent transport properties compared with intrinsic *** this paper,quantized conductance and valley polarization in silicene nanoconstrictions are theoretically investigated in quantum spin-Hall insulator *** perfect valley filter effect is found by aligning the gate voltage in the central constriction ***,the valley polarization plateaus are shifted with the increase of spin-orbit coupling strength,accompanied by smooth variation of polarization *** findings provide new strategies to control the valley polarization in valleytronic devices.

关键词： valley polarization spin-orbit coupling quantization silicene

Improving Recording Density of All-Optical Magnetic Storage by Using High-Pass Angular Spectrum Filters

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Chinese Physics Letters 2009年第10期26卷 209-211页

作者：庄友谊张耀举 college of Physics and Electronic Information Wenzhou University Wenzhou 325035

A new design is presented to improve the magnetic recording density in all-optical magnetic storage. By using the high numerical lens with a high-pass angular spectrum filter, circularly polarized laser pulses are focused into the magneto-optic film with the perpendicular anisotropy. Magnetization of the film is induced by the inverse Faraday effect. As the obstructed angle of the filter increases the magnetic recording density increases evidently. The magnetization intensity and the sidelobe effect are also discussed.

关键词： sea surface nonliear interaction numerical method

Fabrication of bulk Al-Co-Cr-Fe-Ni high-entropy alloy using combined cable wire arc additive manufacturing(CCW-AAM):Microstructure and mechanical properties

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Journal of Materials Science & Technology 2021年第15期74卷 136-142页

作者： Qingkai Shen Xiangdong Kong Xizhang Chen college of Mechanical and Electrical Engineering Wenzhou UniversityWenzhou325000China

Additive manufacturing is a very promising manufacturing method widely used in various *** this study,for the first time,a new type of combined cable wire(CCW)with multi-element composition has been designed and developed for arc additive manufacturing(AAM)of non-equiatomic Al-Co-Cr-FeNi high-entropy *** composed of 7 filaments and 5 elements has the advantages of high deposition efficiency,self-rotation of welding arc and energy saving *** HEA walls were fabricated under pure argon gas using cold metal transfer *** observations of the developed HEA reveal(i)BCC and FCC phases,(ii)Good bonding between layers and(iii)defect-free *** developed alloy exhibits high compression strength(~2.8 GPa)coupled with high plastic strain(~42%)values(possess both strength and ductility).It has been identified that by varying the heat input via torch travel speed,the microstructure and mechanical properties of the HEA can be *** this feasibility study,it has been proved that the innovative CCW method can be used to manufacture HEAs with ***,the study highlights the advantage of the rapid cooling involved in the CCW-AAM process which gives rise to superior mechanical properties.

关键词： Combined cable wire Arc additive manufacturing High-entropy alloy Microstructure Mechanical properties

Machinery fault diagnostic method based on numerical simulation driving partial transfer learning

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Science China(Technological Sciences) 2023年第12期66卷 3462-3474页

作者： LOU YunXia KUMAR Anil XIANG JiaWei college of Mechanical and Electrical Engineering Wenzhou UniversityWenzhou 325035China

Artificial intelligence(AI),which has recently gained popularity,is being extensively employed in modern fault diagnostic research to preserve the reliability and productivity of *** effectiveness of AI is influenced by the quality of the labeled training ***,in engineering scenarios,available data on mechanical equipment are scarce,and collecting massive amounts of well-annotated fault data to train AI models is expensive and *** response to the inadequacy of training samples,a numerical simulation-based partial transfer learning method for machinery fault diagnosis is ***,a suitable simulation model of critical components in a mechanical system is developed using the finite element method(FEM),and numerical simulation is performed to acquire FEM simulation samples containing different fault ***,several synthetic simulation samples are generated to form complete source domain training samples using a generative adversarial ***,the partial transfer learning network is trained to extract shared fault characteristics between the simulation and measured samples in the case of class ***,the resulting model is used to diagnose unknown samples from real-world mechanical systems in *** proposed method is tested on actual fault samples of bearings and gears obtained from a public dataset and experimental test rig available in our laboratory,achieving average classification accuracy of 99.54%and 99.64%,*** investigations reveal that the proposed method has superior classification and generalization ability when detecting faults in real mechanical systems.

关键词： finite element method generative adversarial network fault diagnosis partial transfer learning bearing gear

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Controllably Coupling Superconducting Charge and Flux Qubits by Using Nanomechanical Resonator

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Chinese Physics Letters 2017年第5期34卷 9-12页

作者：郭羊青姜年权 college of Physics and Electric Information Wenzhou University Wenzhou 325035

We propose an effective mechanism to couple superconducting charge and flux qubits by using a quantized nanomechanical resonator. The coupling between the charge and flux qubits can be controlled by the external flux of the charge qubit. Under the strong coupling limR, an iSWAP gate can be generated by this scheme. The experimental feasibility in our scheme is also presented.

关键词： Controllably Coupling Superconducting Charge and Flux Qubits by Using Nanomechanical Resonator

Quantitative Analysis of Composition Change in AZ31 Magnesium Alloy Using CF-LIBS After Laser Material Processing

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Plasma Science and Technology 2015年第11期17卷 909-913页

作者：朱德华曹宇钟蓉陈孝敬 college of Mechanical & Electrical Engineering Wenzhou University college of Physics & Electronic Information Engineering Wenzhou University

The concentration of elements in molten metal of AZ31 magnesium alloy after long pulsed Nd：YAG laser processing was quantitatively analyzed by using calibration-free laser-induced breakdown spectroscopy （CF-LIBS）. The composition change in AZ31 magnesium alloy under different laser pulse width was also investigated. The experimental results showed that CF-LIBS can obtain satisfactory quantitative or semi-quantitative results for matrix or major elements, while only qualitative analysis was possible for minor or trace elements. Moreover, it is found that the chemical composition of molten metal will change after laser processing. The concentration of magnesium in molten metal is lower than that present in the base metal. The Mg loss increases with an increase of pulse width in the laser processing. This result shows that the selective vaporization of different elements is affected by the pulse width during laser processing.

关键词： laser processing CF-LIBS emission spectra composition change AZ31 magnesium alloy

One-Step Generation of Multi-Qubit GHZ and W States in Superconducting Transmon Qubit System

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Communications in Theoretical Physics 2012年第2期57卷 205-208页

作者：高贵龙蔡根畅黄寿胜王明锋姜年权 college of Physics and Electric Information Wenzhou University college of Music Wenzhou University

We propose a one-step method to prepare multi-qubit GHZ and W states with transmon qubits capacitively coupled to a superconducting transmission line resonator(TLR).Compared with the scheme firstly introduced by Wang et al.[***.B 81(2010) 104524],our schemes have longer dephasing time and much shorter operation time because the transmon qubits we used are not only more robust to the decoherence and the unavoidable parameter variations,but also have much stronger coupling constant with *** on the favourable properties of transmons and TLR,our method is more feasible in experiment.

关键词： transmon transmission line resonator GHZ state W state

1→N quantum controlled phase gate realized in a circuit QED system

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1422-1426页

作者： GAO GuiLong CAI GenChang HUANG.ShouSheng TANG LongYing GU WenJing WANG MingFeng JIANG-NianQuan college of Physics and Electric Information Wenzhou University Wenzhou 325035 China college of Music Wenzhou University Wenzhou 325035 China

We propose an effective method to realize the quantum phase gate the system in which the transmon qubits are capacitively coupled to of one qubit simultaneously controlling N qubits. We use a superconducting transmission line resonator driven by a strong microwave field. In our scheme, the phase gate can be realized in a time （nanosecond-scale） much shorter than deco herence time （microsecond-scale）, and it is more immune to the l/（charge noise and has longer dephasing time due to the fa vorable properties of the transmon qubits in the system.

关键词： phase gate transmon qubit transmission line resonator

Surface-induced Morphologies of ABC Star Triblock Copolymer in Spherical Cavities

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Chinese Journal of Polymer Science 2015年第11期33卷 1503-1515页

作者： Wen-bo Jiang Yong-yun Ji Wen-chang Lang 李士本王向红 Department of Physics Wenzhou University Department of Physics Wenzhou Vocational and Technical College

The morphologies and phase diagrams exhibited by symmetric ABC star triblock copolymer nanoparticles are investigated on the basis of real-space self-consistent field theory. The ABC star triblock copolymers were chosen to be tiling-forming with fixed polymer parameter and the spherical boundaries were modeled using the masking technique. We first study a number of examples where the ABC triblock copolymers confined in spherical cavities with neutral surface. Then, two types of spherical cavity distinct preferential surfaces are considered, including both A-block attractive and repulsive preferential surfaces. We aim at the effects due to various spherical cavity diameters and the degree of interactions between the polymer and the spherical surface. A variety of morphologies, such as ring-like structures, concentric sphere, and irregular cylinder, were identified in phase diagrams. The results show that both the degree of interactions and spherical diameters can influence the formation of morphologies so that ring-like structures and other novel structures could be obtained.

关键词： Morphology Star triblock copolymer Spherical cavity SCFT