检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Zhang, Zhi-Xuan Ren, Fang-Bin Hsu, Chia-Hsun Zhang, Xiao-Ying Gao, Peng Wu, Wan-Yu Wuu, Dong-Sing Jiang, Linqin Qiu, Yu Lai, Feng-Min Lien, Shui-Yang Zhu, Wen-Zhang Xiamen Key Laboratory of Development and Application for Advanced Semiconductor Coating Technology The School of Opto-electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen361024 China Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China Department of Materials Science and Engineering National United University Miaoli36063 Taiwan Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou54561 Taiwan College of Electronic Information Science Fujian Jiangxia University Fuzhou350108 China Department of Biomedical Engineering Da-Yeh University Changhua51591 Taiwan

In this study, aluminum gallium nitride (AlGaN) films are prepared by supercycle plasma enhanced vapor deposition (PEALD) with trimethylgallium, trimethylaluminum, and NH3 plasma. The ratio of aluminum nitride (AlN) to gallium nitride (GaN) PEALD cycle number is varied to investigated its effect on film properties. The experimental results show that the growth per cycle is lower than that of the mixing rule prediction, and the Ga content dramatically drops with increasing the AlN cycle ratio. It is implied that AlN surface partly hinders the growth of GaN during supercycle deposition. The Ga:Al elemental ratio is found to be 1:1 at the AlN cycle ratio of 20%, beyond which the film transforms from Ga-rich to Ga-poor and is accompanied with increased Al-Al metallic bonds. The film with the 20% AlN cycle ratio also exhibits the least aggregated surface morphology. The elemental depth profile investigated using secondary ion mass spectroscopy indicates an uniform distribution of Ga, Al and N. The bandgap of supercycle PEALD AlGaN films can be tuned when the AlN cycle ratio is less than 20%. Moreover, the AlGaN film with 20% AlN cycle ratio shows a photoluminescence peak centered at 277 nm, agreeing with the bandgap of the film. © 2023, The Authors. All rights reserved.

关键词： Aluminum nitride

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Matter and radiation at extremes:Prospects and impacts

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Matter and Radiation at Extremes 2021年第1期6卷 3-4页

作者： Michel Koenig David Crandall Ho-Kwang Mao Ke Lan Dieter H.H.Hoffmann Weiyan Zhang Laboratoire LULI CNRSCEAEcole PolytechniqueUPMCUniv Paris 06:Sorbonne UniversitesInstitut Polytechnique de ParisF-91128 Palaiseau cedexFrance Independent Consultant Retired from United States Department of EnergyRockvilleMaryland 20850USA Center for High Pressure Science and Technology Advanced Research ShanghaiChina Institute of Applied Physics and Computational Mathematics BeijingChina Center for Applied Physics and Technology Peking UniversityBeijing100871China Xi’an Jiaotong University Xi’anChina China Academy of Engineering Physics MianyangChina

High-energy-density science(HEDS)has been recognized as a comprehensive new area of physical science,with the potential to revolutionize various scientific and technological fields,including nuclear fusion,particle acceleration,astrophysics,and the properties of condensed matter under extreme *** is why this journal,Matter and Radiation at Extremes(MRE),was established five years ago by the China Academy of Engineering Physics(CAEP)with the mission of informing the worldwide scientific community about progress related to HEDS,whether this be in the basic physics.

关键词： conditions. extreme acceleration

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A sustainable and green approach towards the utilization of biopolymers for effective wound dressing applications: A detailed review

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Nano-Structures and Nano-Objects 2024年 37卷

作者： Verma, Deepak Okhawilai, Manunya Nangan, Senthilkumar Thakur, Vijay Kumar Gopi, Sreeraj Kuppusamy, Kanagaraj Sharma, Mohit Uyama, Hiroshi International Graduate Program of Nanoscience and Technology Chulalongkorn University Bangkok Thailand Metallurgy and Materials Science Research Institute Chulalongkorn University Bangkok 10330 Thailand Center of Excellence in Polymeric Materials for Medical Practice Devices Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand Biorefining and Advanced Materials Research Centre SRUC Kings Buildings West Mains Road Edinburgh EH9 3JG United Kingdom Centre for Research and Development Chandigarh University Punjab Mohali 140413 India Gdansk University of Technology Faculty of Chemistry Polymer Technology Department Gdansk Poland Molecule Food solutions Pvt Ltd Prestiga Atlanda Karnataka Bengaluru 560034 India Center for Supramolecular Chemistry & Catalysis and Department of Chemistry College of Science Shanghai University 99 Shang-Da Road Shanghai 200444 China Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A⁎STAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Singapore Department of Applied Chemistry Graduate School of Engineering Osaka University Osaka 565-0871 Japan

Millions of people worldwide are suffering and struggling to obtain the most effective wound care/treatment. In previous years, a steep rise in metabolic disorders such as diabetic wound ulcers has been noticed. The primary function of an effective wound dressing is to protect the wound bed from contamination and provide an accelerated healing environment. Biopolymers, a natural boon, can be used for distinct applications from food packaging, biomedicine, and biomedical applications. Natural and synthetic biopolymers have distinct advantages, such as biocompatibility, biodegradability, and environmental friendliness. Cellulose, chitosan, alginates, hyaluronic acid, collagen, etc., are natural biopolymers primarily used to develop wound dressings. Most common synthetic biopolymers such as PVA, PCL, and PLA are examples of how an individual biopolymer or its blends can be used to develop an effective wound dressing. Biopolymer properties for wound dressing applications can be improved by applying the concepts of nanotechnology, bioengineering, and drug delivery. These improvements may help meet the current and future wound care demands for tissue repair and restoration. The current review focuses on using natural and synthetic functionalized biopolymers for effective wound-dressing applications and exhibiting their antibacterial and antimicrobial properties. © 2024 Elsevier B.V.

关键词： Biopolymer functionalization Drug delivery Natural and synthetic Biopolymers Wound dressings Wounds

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Solar Biomass Pyrolysis with Latent Heat Ballast

Solar Biomass Pyrolysis with Latent Heat Ballast

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Power and Energy Engineering (ICPEE), International Conference on

作者： Zhang Huili Baeyens Jan Dewil Raf Li Shuo Deng Yimin Reyes-Urrutia Andrés Venier César Martin Mazza Germán College of Life Science and Technology Beijing University of Chemical Technology Beijing China Beijing Advanced Innovation Centre for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing China Process and Environmental Technology Lab KU Leuven Sint-Katelijne-Waver Belgium Biotechnology and Alternative Energies Institute for Research and Development in Process Engineering Neuquén Argentina Research Center for Computational Methods CIMEC-CONICET National University of the Littoral Santa Fe Argentina

ISBN: (纸本)9781665420471

The concentrated solar-driven pyrolysis of biomass (sawdust) was examined in a fluidized bed reactor with 0.15 mI.D. and 0.3 m bed height, using cristobalite sand as bed material. The fluidized bed a reactor was fitted with in-bed tubes, filled with a phase change material with phase change temperature of 450 to 475°C. Four, 5 and 9 tube-inserts were examined. The solution with 5 tube-insert was experimentally demonstrated to considerably influence the bubble sizes and frequencies in the reactor, leading to an enhanced heat transfer from the irradiated reactor wall to the fluidized bed, and from the fluidized bed to the in-bed tubes. The steam assisted pyrolysis produced between 40 and 55 wt% of high-quality biochar (BET $\gg 100 m^{2}$/g), about 20 to 25 wt% of oxygenated bio-oil and the balance as syngas. The operation at moderate temperature and with steam injection drives the pyrolysis reactor towards biochar production. In using the PCM-ballasted inserts, the temperature could be narrowly controlled within the selected operation range, whereas it was also possible to maintain the temperature at the required level for 15 to 20 minutes during non-sun periods.

关键词： Phase change materials Temperature distribution Electronic ballasts Software packages Electron tubes Biomass Temperature control

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Interfacial magnetic spin Hall effect in van der Waals Fe3GeTe2/MoTe2 heterostructure

arXiv

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arXiv 2024年

作者： Dai, Yudi Xiong, Junlin Ge, Yanfeng Cheng, Bin Wang, Lizheng Wang, Pengfei Liu, Zenglin Yan, Shengnan Zhang, Cuiwei Xu, Xianghan Shi, Youguo Cheong, Sang-Wook Xiao, Cong Yang, Shengyuan A. Liang, Shi-Jun Miao, Feng National Laboratory of Solid State Microstructures Institute of Brain-Inspired Intelligence School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore Singapore Institute of Interdisciplinary Physical Sciences School of Science Nanjing University of Science and Technology Nanjing210094 China Institute of Physics Chinese Academy of Sciences Beijing100190 China Center for Quantum Materials Synthesis Department of Physics and Astronomy Rutgers The State University of New Jersey PiscatawayNJ08854 United States Institute of Applied Physics and Materials Engineering University of Macau Taipa Macau China Department of Physics University of Hong Kong Hong Kong Hong Kong HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong Hong Kong Hong Kong

The spin Hall effect (SHE) allows efficient generation of spin polarization or spin current through charge current and plays a crucial role in the development of spintronics. While SHE typically occurs in non-magnetic materials and is time-reversal even, exploring time-reversal-odd (T-odd) SHE, which couples SHE to magnetization in ferromagnetic materials, offers a new charge-spin conversion mechanism with new functionalities. Here, we report the observation of giant Todd SHE in Fe3GeTe2/MoTe2 van der Waals heterostructure, representing a previously unidentified interfacial magnetic spin Hall effect (interfacial-MSHE). Through rigorous symmetry analysis and theoretical calculations, we attribute the interfacial-MSHE to a symmetry-breaking induced spin current dipole at the vdW interface. Furthermore, we show that this linear effect can be used for implementing multiply-accumulate operations and binary convolutional neural networks with cascaded multi-terminal devices. Our findings uncover an interfacial T-odd charge-spin conversion mechanism with promising potential for energy-efficient in-memory computing. © 2024, CC BY-NC-SA.

关键词： Spin Hall effect

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Covariant density and velocity perturbations of the quasi-Newtonian cosmological model in f(T) gravity

arXiv

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arXiv 2021年

作者： Sami, Heba Sahlu, Shambel Abebe, Amare Dunsby, Peter K.S. Center for Space Research North-West University South Africa Astronomy and Astrophysics Research Development Department Entoto Observatory and Research Center Ethiopian Space Science and Technology Institute Ethiopia Department of Physics College of Natural and Computational Science Wolkite University Ethiopia Cosmology and Gravity Group Department of Mathematics and Applied Mathematics University of Cape Town Rondebosch Cape Town7701 South Africa

We investigate classes of shear-free cosmological dust models with irrotational fluid flows within the framework of f(T) gravity. In particular, we use the 1+3 covariant formalism and present the covariant linearised evolution and constraint equations describing such models. We then derive the integrability conditions describing a consistent evolution of the linearised field equations of these quasi-Newtonian universes in the f(T) gravitational theory. Finally, we derive the evolution equations for the density and velocity perturbations of the quasi-Newtonian universe. We explore the behaviour of the matter density contrast for two models - f(T) = µT0(T/T0)n and the more generalised case, where f(T) = T + µT0(T/T0)n, with and without the application of the quasi-static approximation. Our numerical solutions show that these f(T) theories can be suitable alternatives to study the background dynamics, whereas the growth of energy density fluctuations change dramatically from the expected ΛCDM behaviour even for small deviations away from the general relativistic limits of the underlying f(T) theory. Moreover, applying the so-called quasi-static approximation yields exact-solution results that are orders of magnitude different from the numerically integrated solutions of the full system, suggesting that these approximations are not applicable here. Copyright © 2021, The Authors. All rights reserved.

关键词： Flow of fluids

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Ultrafast Hole Deformation Revealed by Molecular Attosecond Interferometry

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Ultrafast science 2021年第1期1卷 68-79页

作者： Yindong Huang Jing Zhao Zheng Shu Yalei Zhu Jinlei Liu Wenpu Dong Xiaowei Wang Zhihui Lü Dongwen Zhang Jianmin Yuan Jing Chen Zengxiu Zhao Department of Physics National University of Defense TechnologyChangshaHunanChina Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijingChina Institute of Applied Physics and Computational Mathematics BeijingChina Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyangSichuanChina Graduate School of China Academic of Engineering Physics BeijingChina Shenzhen Key Laboratory of Ultra Intense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhenChina

Understanding the evolution of molecular electronic structures is the key to explore and control photochemical reactions and photobiological *** to strong laser fields,electronic holes are formed upon ionization and evolve in the attosecond *** is crucial to probe the electronic dynamics in real time with attosecond-temporal and atomic-spatial ***,we present molecular attosecond interferometry that enables the in situ manipulation of holes in carbon dioxide molecules via the interferometry of the phase-locked electrons(propagating in opposite directions)of a laser-triggered rotational wave *** joint measurement on high-harmonic and terahertz spectroscopy(HATS)provides a unique tool for understanding electron dynamics from picoseconds to *** optimum phases of two-color pulses for controlling the electron wave packet are precisely determined owing to the robust reference provided with the terahertz pulse *** is noteworthy that the contribution of HOMO-1 and HOMO-2 increases reflecting the deformation of the hole as the harmonic order *** method can be applied to study hole dynamics of complex molecules and electron correlations during the strong-field *** threefold control through molecular alignment,laser polarization,and the two-color pulse phase delay allows the precise manipulation of the transient hole paving the way for new advances in attochemistry.

关键词： polarization second interferometry

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Real-Time Krylov Theory for Quantum Computing Algorithms

arXiv

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arXiv 2022年

作者： Shen, Yizhi Klymko, Katherine Sud, James Williams-Young, David B. de Jong, Wibe A. Tubman, Norm M. NASA Ames Research Center Moffett FieldCA94035 United States KBR 601 Jefferson St. HoustonTX77002 United States Department of Chemistry Massachusetts Institute of Technology CambridgeMA02139 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States USRA Research Institute for Advanced Computer Science Mountain ViewCA94043 United States Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Quantum computers provide alternative avenues to access ground and excited state properties of systems difficult to simulate on classical hardware. New approaches using subspaces generated by real-time evolution have shown efficiency in extracting eigenstate information, but the full capabilities of such approaches are still not understood. In recent work, we developed the variational quantum phase estimation (VQPE) method, a compact and efficient real-time algorithm to extract eigenvalues using quantum hardware. Here we build on that work by theoretically and numerically exploring a generalized Krylov scheme where the Krylov subspace is constructed through a parametrized real-time evolution, applicable to the VQPE algorithm as well as others. We establish an error bound that justifies the fast convergence of our spectral approximation. We also derive how the overlap with high energy eigenstates becomes suppressed from real-time subspace diagonalization and we visualize the process that shows the signature phase cancellations at specific eigenenergies. We investigate various algorithm implementations and consider performance when stochasticity is added to the target Hamiltonian in the form of spectral statistics. To demonstrate the practicality of such real-time evolution methods, we discuss its application to fundamental problems in quantum computation such as electronic structure predictions for strongly correlated systems. © 2022, CC BY.

关键词： Quantum computers

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First-principles study on the role of surface in the heavy fermion compound CeRh2Si2

arXiv

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arXiv 2021年

作者： Wang, Yue-Chao Xu, Yuan-Ji Liu, Yu Han, Xing-Jie Zhu, Xie-Gang Yang, Yi-Feng Bi, Yan Liu, Hai-Feng Song, Hai-Feng Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100088 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing100190 China Science and Technology on Surface Physics and Chemistry Laboratory Sichuan Jiangyou621908 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China

In the heavy fermion materials, the characteristic energy scales of many exotic strongly correlated phenomena (Kondo effect, magnetic order, superconductivity, etc.) are at milli-electron-volt order, implying that the heavy fermion materials are surface sensitive. Here, we investigate the electronic structures for Si- and Ce-terminated surfaces of CeRh2Si2 by first-principles methods. Our research reveals three notable impacts of surface effects on electronic structures, which are consistent with recent angle-resolved photoemission spectroscopy (ARPES) experiments. Firstly, the relaxation of surface crystal structures changes the relative position of Fermi level, adjusts the dispersion of bands and enhances the Kondo resonance. Secondly, the decrease of the hybridization between the Ce-4f and conduction electrons in the surface layer leads to a weaker Kondo resonance peak and the shift of spin-orbit bands. Thirdly, the variation of crystal electric field around surface Ce atoms affects the splitting of Kondo resonance peaks, and also pushes down the lower-Hubbard bands of surface 4f electrons. Moreover, we find the characteristic of bulk's lower-Hubbard bands, which was overlooked in previous works. Our investigation suggests that these surface effects are potentially important and highlighted in the future researches on properties of strongly correlated materials. Copyright © 2021, The Authors. All rights reserved.

关键词： Electronic structure

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Ultrafast RTA Induced the Structural Properties of the Deficient Oxygen Β-Ga2o3 Film

SSRN

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SSRN 2023年

作者： Huang, Pao-Hsun Zhu, Yu-Quan Wei, Su-Fen Liu, Yi Huang, Chien-Jung Lai, Feng-Min Liu, Jing Lien, Shui-Yang School of Ocean Information Engineering Jimei University Jimei District Fujian Xiamen361021 China Micro & Nano Semiconductor Research Center of Jimei University Jimei District Xiamen361021 China Department of Applied Physics Nation University of Kaohsiung Kaohsiung University Road Kaohsiung81148 Taiwan Department of Biomedical Engineering Da-Yeh University Changhua51591 Taiwan Xiamen Key Laboratory of Development and Application for Advanced Semiconductor Coating Technology School of Opto-electronic and Communication Engineering Xiamen University of Technology Xiamen361024 China Department of Materials Science and Engineering Da-Yeh University Changhua51591 Taiwan

The RF-sputtered β-Ga2O3 films prepared on sapphire substrates were treated by rapid thermal annealing (RTA) under an ultrafast process of 30 sec. The effects of RTA at different process temperatures from 600 to 800 °C on the β-Ga2O3 films were researched. Meanwhile, the schematic diagram for the RTA-induced lattice expansion of films was proposed. The experimental results show that the variation of Ga oxidation states and lattice oxygen was demonstrated, revealing the greater value of lattice oxygen at 700 °C. The preferred (-201) and extra (111) orientations of Ga2O3 films are observed at 700 °C and 800 °C, respectively. The larger grain size, smallest FWHM, and interplanar distance of 4.71 Å for the (-201) were also obtained at 700 °C, accounting for the high-quality β-Ga2O3 films and their lattice expansion. As a result, this RF-sputtered β-Ga2O3 films via the RTA process not only provide a new reference condition but are also suitable for optoelectronic devices requiring control of crystallizing temperature and lattice variation. © 2023, The Authors. All rights reserved.

关键词： Rapid thermal annealing

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