检索结果-内蒙古大学图书馆

Ti-Nb-Zr Ternary Alloy Coatings Sputter Deposited on Aisi 316l Stainless Steel

学校读者我要写书评

暂无评论

SSRN

SSRN 2023年

作者： Lemos, Lucas L.D. de Castro, Ana Luiza Costa, Sidney C.Z. Mastelaro, Valmor Roberto Nascente, Pedro A.P. Graduate Program in Materials Science and Engineering Federal University of Sao Carlos SP Sao CarlosCEP 13565-905 Brazil Sao Carlos Institute of Physics University of Sao Paulo SP Sao CarlosCEP 13560-590 Brazil Department of Materials Engineering Federal University of Sao Carlos SP Sao CarlosCEP 13565-905 Brazil

Titanium, niobium, and zirconium are non-toxic and non-allergenic biocompatible metals, and the ternary Ti-Nb-Zr bulk alloys having predominantly β phase (body-centered cubic structure) present superior corrosion resistance and biocompatibility than medical grade AISI 316L stainless steel (SS) which is commonly used as metallic prosthetic material. However, the Ti-Nb-Zr alloys are much more costly than SS, so the main goal of this study is to produce and characterize lesser costly Ti-Nb-Zr coatings. Magnetron sputtering has shown to be an adequate technique to coat SS surfaces with Ti-based alloys. Three ternary alloy coatings having approximately the same amount of Zr (12-14 at.%) and different amounts of Ti (76, 62, and 53 at.%) and Nb (10, 26, and 34 at.%) were deposited on AISI 316L SS by magnetron sputtering. Only the β phase was detected and the coating surfaces were oxidized, having a beneficial effect on corrosion resistance and presents lesser cytotoxicity. The elastic moduli were evaluated by nanoindentation tests, and the obtained values were smaller than that for the SS substrate. These findings suggest that the Ti-Nb-Zr ternary alloy coatings have promising characteristics for biomedical applications. © 2023, The Authors. All rights reserved.

关键词： Magnetron sputtering

Cavity-mediated superthermal phonon correlations in the ultrastrong coupling regime

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Kim, Dasom Hou, Jin Lee, Geon Agrawal, Ayush Kim, Sunghwan Zhang, Hao Bao, Di Baydin, Andrey Wu, Wenjing Tay, Fuyang Huang, Shengxi Chia, Elbert E.M. Kim, Dai-Sik Seo, Minah Mohite, Aditya D. Hagenmüller, David Kono, Junichiro Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Sensor System Research Center Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Department of Chemical and Biomolecular Engineering Rice University Houston77005 United States Ulsan44919 Korea Republic of Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Smalley–Curl Institute Rice University HoustonTX77005 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States KU–KIST Graduate School of Converging Science and Technology Korea University Seoul02841 Korea Republic of Université de Strasbourg CNRS Strasbourg67200 France Department of Physics and Astronomy Rice University HoustonTX77005 United States

Phonons, or vibrational quanta, are behind some of the most fundamental physical phenomena in solids, including superconductivity, Raman processes, and broken-symmetry phases. It is therefore of fundamental importance to find ways to harness phonons for controlling these phenomena and developing novel quantum technologies. However, the majority of current phonon control techniques rely on the use of intense external driving fields or strong anharmonicities, which restricts their range of applications. Here, we present a scheme for controlling the intensity fluctuations in phonon emission at room temperature based on multimode ultrastrong light–matter coupling. The multimode ultrastrong coupling regime is achieved by coupling two optical phonon modes in lead halide perovskites to an array of nanoslots, which operates as a single-mode cavity. The extremely small mode volume of the nanoslots enables unprecedented coupling strengths in a cavity phonon-polariton system. In the far-detuned, low-cavity-frequency regime, we demonstrate that the nanoslot resonator mediates an effective coupling between the phonon modes, resulting in superthermal phonon bunching in thermal equilibrium, both within the same mode and between different modes. Experimental results are in good agreement with a multimode Hopfield model. Our work paves the way for the tailoring of phonons to modify charge and energy transport in perovskite materials, with potential applications in light-collecting or emitting devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Perovskite

Gyromagnetic Angular Momentum Interconversion in Neutron Stars

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Funaki, Hiroshi Sekino, Yuta Tajima, Hiroyuki Kisaka, Shota Yasutake, Nobutoshi Matsuo, Mamoru Kavli Institute for Theoretical Sciences University of Chinese Academy of Sciences Beijing100190 China RIKEN Saitama Wako351-0198 Japan Saitama Wako351-0198 Japan Saitama Wako351-0198 Japan Department of Physics School of Science The University of Tokyo Tokyo113-0033 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan 2-1-1 Shibazono Chiba Narashino275-0023 Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai319-1195 Japan CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Saitama Wako351-0198 Japan

We propose a novel mechanism for angular momentum (AM) exchange between the crust and core of a neutron star (NS) via the gyromagnetic effect. Using extended hydrodynamics, we model the star by incorporating macroscopic AM and microscopic AM originating from neutron orbital and spin AM. We reveal that macroscopic dynamics in the crust can inform microscopic AM in the core leading to neutron spin polarization, and offer alternative scenario of (anti-)glitches. This work highlights the overlooked multi-scale AM interconversions in NS physics, paving the way for gyromagnetic astrophysics. Copyright © 2025, The Authors. All rights reserved.

关键词： Spin polarization

An Efficient Three-Factor Authenticated Key Agreement Technique Using FCM Under HC-IoT Architectures

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第7期72卷 1373-1389页

作者： Chandrashekhar Meshram Agbotiname Lucky Imoize Sajjad Shaukat Jamal Parkash Tambare Adel R.Alharbi Iqtadar Hussain Department of Post Graduate Studies and Research in Mathematics Jayawanti Haksar Government Post-Graduation CollegeCollege of Chhindwara UniversityBetul460001M.P.India Department of Electrical and Electronics Engineering Faculty of EngineeringUniversity of LagosAkokaLagos100213Nigeria Department of Electrical Engineering and Information Technology Institute of Digital CommunicationRuhr University44801BochumGermany Department of Mathematics College of ScienceKing Khalid UniversityAbhaSaudi Arabia Water Resources&Applied Mathematics Research Lab Nagpur440027India College of Computing and Information Technology University of TabukTabuk71491Saudi Arabia Mathematics Program Department of MathematicsStatistics and PhysicsCollege of Arts and SciencesQatar University2713DohaQatar

The Human-Centered Internet of Things(HC-IoT)is fast becoming a hotbed of security and privacy *** users can establish a common session key through a trusted server over an open communication channel using a three-party authenticated key *** of the early authenticated key agreement systems relied on pairing,hashing,or modular exponentiation processes that are computationally intensive and *** order to address this problem,this paper offers a new three-party authenticated key agreement technique based on fractional chaotic *** new scheme uses fractional chaotic maps and supports the dynamic sensing of HC-IoT devices in the network architecture without a password *** projected security scheme utilized a hash function,which works well for the resource-limited HC-IoT *** results show that our new technique is resistant to password guessing attacks since it does not use a ***,our approach provides users with comprehensive privacy protection,ensuring that a user forgery attack causes no ***,our new technique offers better security features than the techniques currently available in the literature.

关键词： Three-party authenticated key agreement anonymity fractional chaotic maps Chebyshev polynomial password table human-centered internet of things(HC-IoT)

Characterizations of Second-order Nonlinear Optical Susceptibility for ϵ-phase Gallium Oxide

学校读者我要写书评

暂无评论

Characterizations of Second-order Nonlinear Optical Suscepti...

2022 Compound Semiconductor Week, CSW 2022

作者： Zhou, Jingan Zhao, Xuan Xu, Rui Fu, Kai Li, Tao Xu, Mingfei He, Ziyi Robinson, Jacob T. Zhu, Hanyu Zhang, Xiaodong Zhao, Yuji Rice University Department of Electrical and Computer Engineering HoustonTX77005 United States Rice University Smalley-Curl Institute Applied Physics Graduate Program HoustonTX77005 United States Rice University Department of Materials Science and NanoEngineering HoustonTX77005 United States Arizona State University School of Electrical Computer and Energy Engineering TempeAZ85287 United States Suzhou Institute of Nano-tech and Nano-bionics CAS Key Laboratory of Nanodevices and Applications Suzhou215123 China

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

In this work, we report the second-order nonlinear optical susceptibility χ(2) for epsilon phase Gallium Oxide (ϵ-Ga2O3) thin film on sapphire. ϵ-Ga2O3 exhibits hexagonal P63mc space group symmetry, which is a non-centrosymmetric structure with non-zero second order susceptibility. By focusing a pulsed laser beam on to a polished ϵ-Ga2O3 thin film, we collected the generated second harmonic photons with an ultra-sensitive femtowatt photodetector, obtaining effective second-order nonlinear optical susceptibility of χ(2) = 4.89×10-3 pm/V at wavelength of 800 nm. Two different measurement systems collecting reflected and transmitted photons were applied separately to make the result more convincing. The wavelength dependence from 790 nm to 900 nm and polarization dependence from TM mode to TE mode were measured as well. These results will be helpful for the design and fabrication of Ga2O3 based integrated photonics platform in the infrared-visible spectral range. © 2022 IEEE.

关键词： Gallium compounds

Microparticles obtained via spray pyrolysis for random laser and luminescence thermometry applications

学校读者我要写书评

暂无评论

Microparticles obtained via spray pyrolysis for random laser...

Latin America Optics and Photonics Conference, LAOP 2022

作者： Pugina, Roberta S. Hilário, Eloísa G. da Silva-Neto, Manoel L. Gomes, Anderson S.L. Caiut, José Maurício A. Chemistry Department Faculdade de Filosofia Ciências e Letras de Ribeirão Preto Universidade de São Paulo Ribeirão Preto São Paulo14040-901 Brazil Graduate Program in Materials Science Universidade Federal de Pernambuco PE Recife50670-901 Brazil Physics Department Universidade Federal de Pernambuco Cidade Universitária Av. Prof. Moraes Rego 1235 PE Recife50670-901 Brazil

YAG (Yttrium Aluminum Garnet) spheres doped with different lanthanide ions were obtained via Spray Pyrolysis. The Nd3+:YAG particles were studied for their stimulated emissions in disordered environments, while Yb3+/E... 详细信息

ISBN: (纸本)9781957171135

关键词： Spray pyrolysis

A Cluster-Based Filtering Technique for Denoising 4D-STEM Datasets

学校读者我要写书评

暂无评论

Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Mireles, Adan Han, Yimo Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Materials Science and NanoEngineering Rice University Houston TX USA

Optical coherent perfect absorption and amplification in a time-varying medium

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Galiffi, Emanuele Harwood, Anthony C. Vezzoli, Stefano Tirole, Romain Alù, Andrea Sapienza, Riccardo Photonics Initiative Advanced Science Research Center City University of New York 85 St. Nicholas Terrace New York10031 United States The Blackett Laboratory Imperial College London South Kensington Campus LondonSW72AZ United Kingdom Physics Program Graduate Center City University of New York 365 5th Avenue New York10016 United States

Time-invariant photonic structures amplify or absorb light based on their intrinsic material gain or loss. The coherent interference of multiple beams in space, e.g., in a resonator, can be exploited to tailor the wave interaction with material gain or loss, respectively maximizing lasing or coherent perfect absorption. By contrast, a time-varying system is not bound to conserve energy, even in the absence of material gain or loss, and can support amplification or absorption of a probe wave through parametric phenomena. Here, we demonstrate theoretically and experimentally how a subwavelength film of indium tin oxide, whose bulk permittivity is homogeneously and periodically modulated via optical pumping, can be dynamically tuned to act both as a non-resonant amplifier and a perfect absorber, by manipulating the relative phase of two counterpropagating probe beams. This extends the concept of coherent perfect absorption to the temporal domain. We interpret this result as selective switching between the gain and loss modes present in the momentum bandgap of a periodically modulated medium. By tailoring the relative intensity of the two probes, high-contrast modulation can be achieved with up to 80% absorption and 400% amplification. Our results demonstrate control of gain and loss in time-varying media at optical frequencies and pave the way towards coherent manipulation of light in Floquet-engineered complex photonic systems. © 2024, CC BY.

关键词： Optical parametric amplifiers

Leaky-wave metasurfaces for integrated photonics

学校读者我要写书评

暂无评论

arXiv 2022年

作者： Huang, Heqing Overvig, Adam C. Xu, Yuan Malek, Stephanie C. Tsai, Cheng-Chia Alù, Andrea Yu, Nanfang Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States

Metasurfaces have been rapidly advancing our command over the many degrees of freedom of light within compact, lightweight devices. However, so far, they have mostly been limited to manipulating light in free space. Grating couplers provide the opportunity of bridging far-field optical radiation and in-plane guided waves, and thus have become fundamental building blocks in photonic integrated circuits. However, their operation and degree of light control is much more limited than metasurfaces. Metasurfaces integrated on top of guided wave photonic systems have been explored to control the scattering of light off-chip with enhanced functionalities – namely, point-by-point manipulation of amplitude, phase or polarization. However, these efforts have so far been limited to controlling one or two optical degrees of freedom at best, and to device configurations much more complex compared to conventional grating couplers. Here, we introduce leaky-wave metasurfaces, which are based on symmetry-broken photonic crystal slabs that support quasi-bound states in the continuum. This platform has a compact form factor equivalent to the one of conventional grating couplers, but it provides full command over amplitude, phase and polarization (four optical degrees of freedom) across large apertures. We present experimental demonstrations of various functionalities for operation at λ = 1.55 μm based on leaky-wave metasurfaces, including devices for phase and amplitude control at a fixed polarization state, and devices controlling all four optical degrees of freedom. Our results merge the fields of guided and free-space optics under the umbrella of metasurfaces, exploiting the hybrid nature of quasi-bound states in the continuum, for opportunities to advance in disruptive ways imaging, communications, augmented reality, quantum optics, LIDAR and integrated photonic systems. © 2022, CC BY.

关键词： Guided electromagnetic wave propagation