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Nanodevices engineering and spin transport properties of MnBi_(2)Te_(4) monolayer

npj Computational Materials 2021年第1期7卷 414-421页

作者： Yipeng An Kun Wang Shijing Gong Yusheng Hou Chunlan Ma Mingfu Zhu Chuanxi Zhao Tianxing Wang Shuhong Ma Heyan Wang Ruqian Wu Wuming Liu School of Physics&Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Henan Normal UniversityXinxiangChina Department of Physics and Astronomy Mississippi State UniversityStarkvilleMSUSA Department of Chemistry Mississippi State UniversityStarkvilleMSUSA Key Laboratory of Polar Materials and Devices(MOE)&Department of Optoelectronics East China Normal UniversityShanghaiChina Department of Physics and Astronomy University of CaliforniaIrvineCAUSA School of Physics Sun Yat-Sen UniversityGuangzhouChina School of Physics and Technology Suzhou University of Science and TechnologySuzhouJiangsuChina Hebi National Lighting Co.Ltd HebiChina Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhouChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina

Two-dimensional(2D)magnetic materials are essential for the development of the next-generation spintronic ***,layered van der Waals(vdW)compound MnBi2Te4(MBT)has attracted great interest,and its 2D structure has been reported to host coexisting magnetism and ***,we design several conceptual nanodevices based on MBT monolayer(MBT-ML)and reveal their spin-dependent transport properties by means of the first-principles *** pn-junction diodes and sub-3-nm pin-junction field-effect transistors(FETs)show a strong rectifying effect and a spin filtering effect,with an ideality factor n close to 1 even at a reasonably high *** addition,the pip-and nin-junction FETs give an interesting negative differential resistive(NDR)*** gate voltages can tune currents through these FETs in a large ***,the MBT-ML has a strong response to *** results uncover the multifunctional nature of MBT-ML,pave the road for its applications in diverse next-generation semiconductor spin electric devices.

关键词： temperature ideality transport

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EWT: Efficient Wavelet-Transformer for Single Image Denoising

arXiv

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arXiv 2023年

作者： Li, Juncheng Cheng, Bodong Chen, Ying Gao, Guangwei Zeng, Tieyong The School of Communication & Information Engineering Shanghai University Shanghai China Jiangsu Key Laboratory of Image and Video Understanding for Social Safety Nanjing University of Science and Technology Nanjing China The School of Computer Science and Technology Xidian University Xian China The Department of Cyberspace Security Beijing Electronic Science & Technology Institute Beijing China The Institute of Advanced Technology Nanjing University of Posts and Telecommunications Nanjing China The Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou China The Department of Mathematics The Chinese University of Hong Kong New Territories Hong Kong

Transformer-based image denoising methods have achieved encouraging results in the past year. However, it must uses linear operations to model long-range dependencies, which greatly increases model inference time and consumes GPU storage space. Compared with convolutional neural network-based methods, current Transformer-based image denoising methods cannot achieve a balance between performance improvement and resource consumption. In this paper, we propose an Efficient Wavelet Transformer (EWT) for image denoising. Specifically, we use Discrete Wavelet Transform (DWT) and Inverse Wavelet Transform (IWT) for downsampling and upsampling, respectively. This method can fully preserve the image features while reducing the image resolution, thereby greatly reducing the device resource consumption of the Transformer model. Furthermore, we propose a novel Dual-stream Feature Extraction Block (DFEB) to extract image features at different levels, which can further reduce model inference time and GPU memory usage. Experiments show that our method speeds up the original Transformer by more than 80%, reduces GPU memory usage by more than 60%, and achieves excellent denoising results. All code will be public. © 2023, CC BY.

关键词： Image denoising

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Epitaxial strain tuning of electronic and spin excitations in La3Ni2O7 thin films

arXiv

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arXiv 2025年

作者： Zhong, Hengyang Haobo Wei, Yuan Zhang, Zhijia Liu, Ruixian Huang, Xinru Ni, Xiao-Sheng dos Reis Cantarino, Marli Cao, Kun Nie, Yuefeng Schmitt, Thorsten Lu, Xingye Center for Advanced Quantum Studies School of Physics and Astronomy Beijing Normal University Beijing100875 China Key Laboratory of Multiscale Spin Physics Ministry of Education Beijing100875 China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Photon Science Division Swiss Light Source Paul Scherrer Institut Villigen PSICH-5232 Switzerland Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies Center for Neutron Science and Technology School of Physics Sun Yat-Sen University Guangzhou510275 China European Synchrotron Radiation Facility BP 220 GrenobleF-38043 Cedex France

The discovery of ambient-pressure superconductivity with Tc,onset > 40 K in La3Ni2O7 (LNO) thin films under in-plane biaxial compressive strain underscores the pivotal role of epitaxial strain in tuning exotic electronic states and provides a unique platform for investigating the superconducting mechanisms in nickelate superconductors. Here, we use resonant inelastic X-ray scattering (RIXS) to probe the strain-dependent electronic and spin excitations in LNO thin films with biaxial strain ranging from ϵ ≈ −1.04% to 1.91%. Compared with the bulk crystal, the LNO thin film grown on LaAlO3 (with ϵ ≈ −1.04%) exhibits similar dd excitations and enhanced spin excitation bandwidth. In contrast, the 0.4 eV and 1.6 eV dd excitations associated with the Ni 3dz2 orbital, along with the spin excitations, are significantly suppressed in the film grown on SrTiO3 (Ε ≈ 1.91%). The c-axis compression and the reduced out-of-plane Ni-O-Ni bond angle, induced by in-plane tensile strain in LNO/SrTiO3 broaden the Ni 3dz2 bandwidth and decrease the Ni 3dz2-O 2pz hybridization, thereby suppressing the dd excitations. The evolution of spin excitations reflects significant changes in the interlayer exchange coupling Jz, which can be attributed to the strain-tuned Ni-O-Ni bond angle. Since superconductivity is observed only in films with in-plane compressive strain (ϵ ∼ −2%), the strain-dependent spin correlations align with the emergence of superconductivity, providing indirect evidence for spin-fluctuation-mediated unconventional superconductivity in LNO. © 2025, CC BY-NC-ND.

关键词： X ray scattering

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Hierarchical Nicop/Nico Architecture on Ni Mesh Boosts Hydrogen Production Under Industrial Alkaline Conditions

SSRN

引用

SSRN 2023年

作者： Chen, Cong Zhou, Ju Shen, Junxia An, Tai Wei, Zhihe Zhang, Yazhou Ju, Sheng Peng, Yang Fan, Ronglei Shen, Mingrong School of Physical Science and Technology Jiangsu Key Laboratory of Thin Films Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University 1 Shizi Street Suzhou215006 China Soochow Institute of Energy and Material Innovations College of Energy Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies Soochow University Suzhou215006 China School of advanced Energy Shenzhen campus of Sun Yat-sen University Guangdong Shenzhen518107 China Department of Photoelectric Science and Energy Engineering Suzhou City University Suzhou215104 China

Industrial alkaline water electrolysis (AWE) has been burdened with huge energy consumption due to the large overpotential and poor stability of electrocatalysts for hydrogen evolution reaction (HER). Herein, we developed a hierarchical NiCoP/NiCo catalyst on Ni mesh (NCP/NC/Ni) via a facile electrodeposition method, which exhibits a remarkable HER performance under laboratory conditions with a small overpotential of 237 mV to yield -500 mA cm-2 for 30 days. When pairing with a Ni mesh anode in an AWE device under industrial conditions (30 wt% KOH, 85 ℃), the NCP/NC/Ni||Ni electrolyzer can give a steady current density of 500 mA cm-2 at 1.88 V for 30 days, overmatching that of the industrial-used Raney Ni/Ni||Ni (2.05 V). Systemic experiments and theoretical calculations elucidated that the outstanding HER performance is originated from the excellent intrinsic HER activity of the amorphous NCP and the multifunctional roles of the NC buffer layer. The micro-cones textured NC layer provides abundant active sites and promotes the mass transfer of H2-bubbles and charge transfer due to the improvement of the electrical contact between NCP and Ni. More impressively, NC also releases the stress between Ni and NCP, making the disappearance of the cracks on the dense NCP layer and improving the lifetime of the catalyst. This work gives an avenue to develop highly efficient and stable catalytic materials for industrial AWE through designing a hierarchical architecture. © 2023, The Authors. All rights reserved.

关键词： Hydrogen production

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Hierarchical Nicop/Nico Architecture on Ni Mesh Boosts Hydrogen Production Under Industrial Alkaline Conditions

SSRN

引用

SSRN 2023年

Industrial alkaline water electrolysis (AWE) has been burdened with huge energy consumption due to the large overpotential and poor stability of catalysts for hydrogen evolution reaction (HER). Herein, we developed a hierarchical NiCoP/NiCo catalyst on Ni mesh (NCP/NC/Ni) via a facile electrodeposition method, which exhibits a remarkable HER performance. When pairing with a Ni mesh anode under industrial conditions (30 wt% KOH, 85 ℃), the AWE device can give a steady current density of 500 mA cm-2 at 1.88 V for 30 days, overmatching that of the industrial-used Raney Ni (2.05 V). Systemic experiments and theoretical calculations elucidated that the superb HER performance is attributed to the excellent intrinsic activity of the amorphous NCP and the multifunctional role of the NC buffer layer in charge transport, mass transfer, and interfacial contact. This work gives a strategy to achieve highly efficient and stable AWE devices. © 2023, The Authors. All rights reserved.

关键词： Hydrogen production

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M13 Phage-Loaded Quaternized Chitosan Nano-Vaccine Against H9N2 Avian Influenza Virus

SSRN

引用

SSRN 2023年

作者： Zhao, Kai Shi, Mingze Xin, Meiyi Zhou, Xin Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation Taizhou Key Laboratory of Biomedicine and Advanced Dosage Forms School of Life Sciences Taizhou University Zhejiang Taizhou318000 China Engineering Research Center of Agricultural Microbiology Technology Ministry of Education Heilongjiang University Harbin150500 China Key Laboratory of Microbiology College of Heilongjiang Province School of Life Sciences Heilongjiang University Heilongjiang Harbin150080 China College of Veterinary Medicine Institute of Comparative Medicine Yangzhou University Jiangsu Yangzhou225009 China

Background: Traditional vaccines have limited protective efficacy and a short duration of effective protection. Therefore, new vaccines with higher protective efficiency must be ***: We used gene recombination technology to construct a genetically engineered M13 phage with the HA gene of H9N2 avian influenza virus (HA-M13). We prepared N-2-Hydroxypropyl trimethyl ammonium chloride chitosan/N, O-carboxymethyl chitosan nanoparticles (N-2-HACC/CMCS NPs) and obtained the composite nanoparticles (HA-M13/N-2-HACC/CMCS) by assembling the two NPs. The N-2-HACC/CMCS NPs and M13 phages were investigated as vaccine adjuvants and gene delivery vehicles. They were also evaluated for their ability to induce immune responses and protect mice from H9N2 AIV infection following intramuscular injection and intranasal ***: The average particle size of HA-M13/N-2-HACC/CMCS was 135.24±4.36 nm and had good safety and stability. N-2-HACC/CMCS NPs efficiently encapsulated HA/M13 to form HA-M13/N-2-HACC/CMCS with an average of approximately 50 phages per particle. The HA-M13/N-2-HACC/CMCS induced immune responses and expressed the HA gene in vitro. Furthermore, the N-2-HACC/CMCS NPs promoted the maturation of DC2.4 to improve MHC I and MHC II pathways and enhance cellular, humoral, and mucosal immune responses. In addition, the N-2-HACC/CMCS NPs had higher stability, protected the HA gene and M13 phage from degradation, and sustainably released antigens. Mice immunized with HA-M13/N-2-HACC/CMCS induced higher titers of anti-H9N2 AIV IgG, IgG1, IgG2a, and sIgA antibodies than combined inactivated vaccines against Newcastle disease virus and H9N2 AIV. Lymphocyte proliferation and IL-2, IL-4, IFN-γ, CD4+, CD8+ T lymphocyte levels also significantly increased. The nano-vaccine effectively protected mice from H9N2 AIV infection after 154 days of immunization, whereas the commercial vaccine provided protection for only 120 ***: We used M13 phages loaded

关键词： Chitosan

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Nanostructured active fiber for mode-locked and Q-switched all-fiber laser systems

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Journal of Lightwave technology 2025年

作者： Wang, Yutian Buczynski, Ryszard Krupa, Katarzyna Barton, Ivo Aubrecht, Jan Kamradek, Michal Fu, Songnian Tang, Ming Franczyk, Marcin Stepanenko, Yuriy Klimczak, Mariusz Kasik, Ivan Peterka, Pavel Zhao, Luming Huazhong University of Science and Technology School of Optical and Electronic Information Wuhan National Laboratory for Optoelectronics Optics Valley Laboratory Wuhan430074 China University of Warsaw Faculty of Physics Warsaw02-093 Poland Lukasiewicz Research Network - Institute of Microelectronics and Photonics Department of Optical Fiber Technology Warsaw02-668 Poland Polish Academy of Sciences Institute of Physical Chemistry Warsaw01-224 Poland Institute of Photonics and Electronics of the Czech Academy of Sciences Prague182 51 Czech Republic Guangdong University of Technology Advanced Institute of Photonics Technology School of Information Engineering Guangdong Provincial Key Laboratory of Information Photonics Technology Guangzhou51006 China Jiangsu Institute of Mid Infrared Laser Technology & Applications Xuzhou221000 China

Mode-locked and Q-switched all-fiber lasers using nanostructured core silica fiber are demonstrated. A novel active fiber has been developed, consisting of a collection of discrete nanorods doped with ytterbium and erbium within an aluminosilicate matrix. The arrangement of nanorods within the fiber core dictates the spatial distribution of amplification and refractive index, enabling the tailored design of the fiber's modal characteristics and dispersion properties. We demonstrate that the employed pumping strategy, which involves stimulating Yb3+ ions situated in nanorods and leveraging a non-radiative energy transfer from Yb3+ to Er3+ ions in distinct nanorods, is effective. This approach facilitates efficient laser performance comparable to fibers with a continuous dispersion of active ions throughout the core. The femtosecond mode-locked pulse at wavelength of 1560 nm, featuring a bandwidth of 5.2 nm, a pulse duration of 860 femtoseconds, and an RF spectral purity with an extinction ratio of 80 dB has been successfully obtained. These results underscore the potential of the nanostructured core fiber concept as an active medium in ultrafast, all-fiber devices © 1983-2012 IEEE.

关键词： Nanorods

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High efficient catalytic oxidation of 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid under benign conditions with nitrogen-doped graphene encapsulated Cu nanoparticles

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Journal of Energy Chemistry 2020年第11期29卷 96-105页

作者： Chaoxin Yang Xiao Li Zhenzhou Zhang Bohan Lv Jiachun Li Zhenjian Liu Wanzhen Zhu Furong Tao Guangqiang Lv Yongxing Yang Shandong Provincial Key Laboratory of Molecular Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353ShandongChina Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou University.Zhengzhou 450001HenanChina School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan 030006ShanxiChina

Selective oxidation of 5-hydroxymethylfurfual(HMF) to 2,5-furandicarboxylic acid(FDCA) as a bioplastics monomer is efficiently promoted by a simple system without noble-metal and base additives. In this work, graphene oxide(GO) was first synthesised by an electrochemical method with flexible graphite paper(FGP) as start carbon material, then, nitrogen-doped graphene(NG) layers encapsulated Cu nanoparticles(NPs) was prepared by one-step thermal treatment of GO supported Cu2+ in flowing NH3 atmosphere. Compared with NG supported Cu NPs prepared by the traditional impregnation method, enhanced catalytic activity was achieved over Cu/NG and an FDCA yield of 95.2% was achieved under mild reaction conditions with tert-butylhydroperoxide(t-BuOOH) as the oxidant. Control experiments with different catalysts and different addition procedure of t-BuOOH showed the yield of HMF and various intermediates during reaction. From the changing of intermediates concentrations and reaction rates, a reaction pathway through HMF-DFF-FFCA-FDCA was proposed. This work gives a more convenient, more green,more economical and effective method in encapsulated metal NPs preparation and high selectivity in HMF oxidation to FDCA under mild conditions.

关键词： Graphene oxide Encapsulated nanoparticles 5-hydroxymethylfurfual 2,5-furandicarboxylic acid Oxidation Noble-metal free

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The Hybrid Path Planning Algorithm Based on Improved Artificial Potential Field and Grid Method for Uuv in 3d Environments

SSRN

引用

SSRN 2023年

作者： Sun, Mingxiao Zhen, Liqiang Luan, Tiantian Zhang, Xiaoshuang Wu, Baoqi School of Automation Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Heilongjiang Provincial Key Laboratory of Complex Intelligent System and Integration Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Jiangsu Automation Research Institution No. 18 Shenghu Road Haizhou District Jiangsu Province Lianyungang City222000 China

The artificial potential field approach (APFA) has the advantages of short computation time and easy implementation, which is widely used in path planning. The problems of local oscillation and susceptibility to local minima for APFA are considered in three dimensions (3D) path planning application of unmanned underwater vehicle (UUV), and the artificial potential field grid method (APFG) is proposed. Firstly, the obstacles are rasterized in 3D map. The repulsive points are attached to the surface of the raster to change the repulsive influence range, which can compensate the shortcoming of the traditional APFA modelling idealization leading to the long planning path. At the same time, the repulsion function on the grid surface is changed so that the potential field on the grid surface is parallel to the grid surface, which will solve the local oscillation problem in the path planning of UUV. Then, virtual target points are introduced to avoid the UUV falling into local optimization. The simulations show that APFG effectively overcomes the shortcomings of local oscillations and the tendency to fall into local minima for UUV in 3D path planning, and the path planning is smooth and efficient. © 2023, The Authors. All rights reserved.

关键词： Unmanned underwater vehicles

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3d Path Planning for Uuv Based on Artificial Potential Field Grid Method

SSRN

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SSRN 2023年

关键词： Motion planning

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