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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Lin, Tong Chen, Xiaotong Xu, Rui Luo, Jiaming Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States

Linearly and circularly polarized phonons in monolayer WS2 are directly excited by resonant infrared pulses. The dynamics of coherent and incoherent chiral phonons are measured by time-resolved Raman spectroscopy and ... 详细信息

ISBN: (纸本)9781957171395

关键词： Time-resolved spectroscopy

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Study of structural, optical, surface and electrochemical properties of Co3O4 nanoparticles for energy storage applications

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Interactions 2024年第1期245卷 1-13页

作者： Ravina Srivastava, Garima Dalela, Saurabh Kumar, Shalendra Nasit, Manas Singh, Jasgurpreet Ahmad, M. Ayaz Alvi, P.A. Department of Physical Science Banasthali Vidyapith Rajasthan 304022 India Department of Pure & amp Applied Physics University of Kota Rajasthan Kota India Dehradun India Department of Mechanical Engineering University Centre for Research & ampDevelopment Chandigarh University Punjab Gharuan India Department of Mathematics Physics and Statistics Faculty of Natural Sciences University of Guyana Georgetown Guyana

Supercapacitors (SCs) are a kind of energy storage that replaces conventional batteries and capacitors. Compared to capacitors, they can store more energy and supply power at a faster rate. Co3O4 nanoparticles have been employed in various products, including rechargeable Li-ion batteries, solar cells, supercapacitors, field effect transistors, field emission materials, magneto-resistive devices, capacitors, and gas sensors. Cobalt is valuable in various undertakings because, as early research found, it may reveal irregular oxidation forms (Co2+, Co3+, and Co4+). Because cobalt has a dual nature, its oxide structures can contain three distinct twist forms: inferior, intermediate, and superior. Co3O4 nanoparticles were created in the current study utilizing the sol-gel technique. Co3O4 nanoparticles with a cubic phase and a spinel structure underwent a two-hour thermal treatment at 600 °C in a furnace. The exceedingly pure cubic crystalline phases are visible using XRD. The crystallite size is 47 nm. Optical parameters were discovered via FTIR and U-V Visible spectroscopy with an energy band gap of 3.67 eV. The FESEM and EDX were also used to compute the surface morphology and elemental mapping of Co3O4. Additionally, Co3O4 electrochemical characteristics as determined by cyclic voltammetry (CV) with a specific capacitance of 532 F/g, galvanostatic charge-discharge with a specific capacitance of 614.2 F/g, and EIS confirmed the capacitive behavior of the Co3O4, which displayed a straight line at low frequencies and a very brief kinetic arc at high frequencies. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Fourier transform infrared spectroscopy

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Hybrid fs/ps CARS for non-equilibrium temperature measurements in N2/H2 DC glow discharges

Hybrid fs/ps CARS for non-equilibrium temperature measuremen...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Chang, Ziqiao Liu, Ning Xu, Yijie Chen, Timothy Y. Sun, Zijian Ju, Yiguang Department of Mechanical and Aerospace Engineering Princeton University PrincetonNJ08544 United States Department of Mechanical and Aerospace Engineering Applied Materials Inc Santa ClaraCA95054 United States Princeton Plasma Physics Laboratory PrincetonNJ08540 United States

ISBN: (纸本)9781624107238

This manuscript presents the development of a hybrid fs/ps coherent anti-Stokes Raman scattering system for rotational and vibrational temperatures measurements in a non-equilibrium N2/H2 DC plasma. A simple 3-beam configuration is used to simultaneously excite both the pure-rotational and rovibrational Raman transitions of the N2 molecule. Vibrational population distributions of Ns(v) up to v= 9 are measured in both pure N2 and N2/H2 DC discharges. Strong vibrational non-equilibrium is observed at both the anode and cathode. The results show that the anode has a stronger non-Boltzmann N2(v) distribution. The addition of H2 reduces the vibrationally excited N2(v) population and increases the gas temperature. These results provide insights into the vibration-vibration (V-V′) energy transfer and vibrational-translational (V-T) relaxation of N2(v) by H2 in DC discharges. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

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Enhanced Hoek-Brown(H-B)criterion for rocks exposed to chemical corrosion

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International Journal of Mining Science and Technology 2024年第5期34卷 609-630页

作者： Hao Li Leo Pel Zhenjiang You David Smeulders Department of Mechanical Engineering Eindhoven University of TechnologyEindhoven 5600 MBthe Netherlands Department of Applied Physics Eindhoven University of TechnologyEindhoven 5600 MBthe Netherlands Center for Sustainable Energy and Resources School of EngineeringEdith Cowan UniversityJoondalupWA 6027Australia School of Chemical Engineering The University of QueenslandBrisbaneQLD 4072Australia Gas and Energy Transition Research Centre The University of QueenslandBrisbaneQLD 4072Australia

Underground constructions often encounter water environments,where water–rock interaction can increase porosity,thereby weakening engineering ***,the failure criterion for chemically corroded rocks becomes essential in the stability analysis and design of such *** study enhances the applicability of the Hoek-Brown(H-B)criterion for engineering structures operating in chemically corrosive conditions by introducing a kinetic porosity-dependent instantaneous mi(KPIM).A multiscale experimental investigation,including nuclear magnetic resonance(NMR),X-ray diffraction(XRD),scanning electron microscopy(SEM),pH and ion chromatography analysis,and triaxial compression tests,is employed to quantify pore structural changes and their linkage with the strength responses of limestone under coupled chemical-mechanical(C-M)*** employing ion chromatography and NMR analysis,along with incorporating the principles of free-face dissolution theory accounting for both congruent and incongruent dissolution,a kinetic chemical corrosion model is *** model aims to calculate the kinetic porosity alterations within rocks exposed to varying H+concentrations and ***,utilizing the generalized mixture rule(GMR),the kinetic porositydependent mi is *** of the KPIM-enhanced H-B criterion using compression test data from 5 types of rocks demonstrated a high level of consistency between the criterion and the experimental results,with a coefficient of determination greater than 0.96,a mean absolute percentage error less than 4.84%,and a root-mean-square deviation less than 5.95 ***,the physical significance of the porosity-dependent instantaneous mi is clarified:it serves as an indicator of a rock’s capacity to leverage the confining pressure effect.

关键词： Hoek-Brown(H-B)criterion Instantaneous mi Kinetic porosity-dependency Chemical corrosion Compressive strength

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Closure equation and higher-order moment relations in the Gauss-Hermite lattice Boltzmann method

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Physical Review E 2024年第5期110卷 055301页

作者： Mahyar Madadi Joseph T. Johnson Yong Shi John E. Sader Department of Materials Physics Research School of Physics School of Mathematics and Statistics The Department of Mechanical Materials and Manufacturing Engineering Graduate Aerospace Laboratories and Department of Applied Physics

Moment methods are often used to solve transport problems involving the Boltzmann-BGK equation. Because the moment equations are underdetermined, these methods require an additional "closure equation" that relates higher to lower-order moments. Here, we examine the closure equation and higher-order moment relations implicit in the lattice Boltzmann method (LBM) that use Gauss-Hermite quadrature for their discrete velocity sets. It is shown that the discrete-velocity-set itself defines the closure equation and higher-order moment relations, the precise forms of which are yet to be reported. The general formula we present facilitates the efficient computational evaluation of higher-order moments and provides insight into the operation of LBM that is anticipated to be useful in theoretical analyses of its performance. Derived formulas for two different velocity sets are validated against numerical implementations of the LBM for steady Couette flow.

关键词： Lattice-Boltzmann methods

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Adaptive Identification of Second-Order mechanical Systems with Nullspace Parameter Structure: Stability and Parameter Convergence 63

Adaptive Identification of Second-Order Mechanical Systems w...

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63rd IEEE Conference on Decision and Control, CDC 2024

作者： Mao, Annie M. Moore, Joseph L. Whitcomb, Louis L. Johns Hopkins University Department of Mechanical Engineering BaltimoreMD United States Johns Hopkins University Applied Physics Laboratory LaurelMD United States

ISBN: (纸本)9798350316339

The relationships between persistence of excitation (PE) conditions and asymptotically stable convergence of parameter estimates are well-known for adaptive systems where stability and convergence are derived with respect to the origin of a combined state error and parameter estimation error system. We address a class of second-order mechanical systems in which the true parameters are, rather than one single point in parameter space, members of a nullspace defined by feasible evolutions of a regressor matrix. Differences within the set of true parameters are unobservable, requiring a new characterization of PE and parameter convergence. We report an adaptive identification (AID) approach for this class of systems and show local stability and parameter estimate convergence to the true parameter set under a subspace PE condition. This approach is applicable to many second-order mechanical systems, including robot arms and undersea, land, aerial, and space vehicles, and enables a more complete parameterization of uncertainty in the dynamics, e.g. enabling simultaneous AID of plant and actuator parameters for mechanical systems. © 2024 IEEE.

关键词： Robotic arms

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Thermal Stability of Bi in Sn-Cu Based High Strength Pb-Free Solder Alloys 23

Thermal Stability of Bi in Sn-Cu Based High Strength Pb-Free...

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23rd International Conference on Electronics Packaging, ICEP 2024

作者： Zhou, Jiye Tan, Xin F. McDonald, Stuart D. Sweatman, Keith Akaiwa, Tetsuya Nogita, Kazuhiro School Of Mechanical And Mining Engineering The University Of Queensland Australia Kyushu University Department Of Applied Quantum Physics And Nuclear Engineering Japan Nihon Superior Co. Ltd. Japan

ISBN: (纸本)9784991191176

Commercial solder alloys with the addition of bismuth (Bi) have gained prominence in the electronics manufacturing industry, because of their low melting point and the strengthening effect associated with Bi. If the Bi concentration exceeds the solubility of Bi in Sn at room temperature (approximately 1.7 wt' in typical Sn-based solder alloys), there will be a driving force for precipitation of Bi within the Sn phase. However, the solubility of Bi in Sn is strongly temperature dependent and dissolution of some or all of the Bi precipitates may occur at higher temperatures, depending on the alloy composition. To study the thermal stability in solders with different Bi content, two samples: ***-3Bi-2Sb-O.8Cu and *** (in wt.%) were characterised by in-situ scanning electron microscopy (SEM) and in-situ powder x-ray diffraction (PXRD). Bi dissolution was observed in the sample with higher Bi addition upon heating and pores remained when the sample was cooled down. On the contrary, in the sample with lower Bi concentration the microstructure remained identical before and after heating, indicating better thermal stability. Furthermore, the microstructure change caused by Bi dissolution is reflected in a volume expansion in the Sn phase lattice obtained by PXRD data. © 2024 Japan Institute of Electronics Packaging.

关键词： Thermal expansion

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Distinct amorphization resistance in highentropy MAX-phases(Ti,M)_(2)AlC(M=Nb,Ta,V,Zr)under in situ irradiation

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npj Computational Materials 2024年第1期10卷 1208-1217页

作者： Hao Xiao Shuang Zhao Jun Zhang Shijun Zhao Youbing Li Ke Chen Liuxuan Cao Yugang Wang Qing Huang Chenxu Wang State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking University100871 BeijingChina Shenzhen Pinghu Laboratory Shenzhen518111China Department of Mechanical Engineering City University of Hong KongHong Kong999077China Ningbo Institute of Material Technology&Engineering Chinese Academy of Sciences(CAS)Ningbo315201China College of Energy Xiamen UniversityXiamen361102China

High-entropy materials have been proposed for applications in nuclear systems recently due to their outstanding properties in extreme *** complexity in these materials plays an important role in irradiation tolerance ... 详细信息

关键词： entropy extreme dissipation

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Fully relativistic many-body perturbation energies,transition properties,and lifetimes of lithium-like iron Fe XXIV

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Chinese physics B 2023年第10期32卷 90-99页

作者：李双赵敏刘国庆胡昌宝潘国柱 School of Electrical and Opto-electronic Engineering West Anhui UniversityLu'an 237012China College of Mechanical and Electronic Engineering Fujian Agriculture and Forestry UniversityFuzhou 350002China Institute of Applied Physics and Computational Mathematics Beijing 100088China Shanghai EBIT Laboratory Institute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghai 200433China

Employing the advanced relativistic configuration interaction(RCI)combined with the many-body perturbation theory(RMBPT)method,we report energies and lifetime values for the lowest 35 energy levels from the(1s^(2))nl configurations(where the principal quantum number n=2–6 and the angular quantum number l=0,...,n-1)of lithium-like iron Fe XXIV,as well as complete data on the transition wavelengths,radiative rates,absorption oscillator strengths,and line strengths between the *** the allowed(E1)and forbidden(magnetic dipole M1,magnetic quadrupole M2,and electric quadrupole E2)ones are *** detailed comparisons with previous results,we assess the overall accuracies of present RMBPT results to be likely the most precise ones to *** interaction effects are found to be very important for the energies and radiative properties for the *** present RMBPT results are valuable for spectral line identification,plasma modeling,and diagnosing.

关键词： relativistic many-body perturbation multi-reference configuration radiative rates lifetime

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Multiferroic and nanomechanical properties of Bi1-xYxFeO3 polycrystalline films (x = 0.0–0.1)

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Journal of Materials Science: Materials in Electronics 2023年第8期34卷 1-14页

作者： Lin, T.K. Chang, H.W. Wang, C.R. Wei, D.H. Tu, C.S. Chen, P.Y. Institute of Manufacturing Technology and Department of Mechanical Engineering National Taipei University of Technology Taipei10608 Taiwan Department of Physics National Chung Cheng University Chia-Yi621 Taiwan Department of Applied Physics Tunghai University Taichung407 Taiwan Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Department of Mechanical Engineering Ming Chi University of Technology New Taipei City24301 Taiwan

In order to improve the multiferroic properties of BiFeO3 and to clarify the Y substitution effect, we use an Nd:YAG laser to grow Bi1-xYxFeO3 (BYFO) films on glass substrates at low deposition temperatures by pulsed laser deposition (PLD). Their phase structure, microstructure, ferroelectric and magnetic characteristics, and leakage mechanism are explored. The existence of the perovskite phase in BYFO films with x = 0.00–0.10 is confirmed. The structure is transformed from rhombohedral for x = 0.00 to pseudo-cubic for x = 0.05, and an additional phase, orthorhombic, is coexisted for x = 0.10. The microstructure and surface morphology analyses demonstrate a decrease in grain size and film roughness when the Y concentration is increased. The crystalline structure and grain size dominate the hardness of 6.5–10.1 GPa, as measured by nanoindenter. We attain good ferroelectric characteristics for BYFO films with x = 0.00–0.05, where the greatest remanent polarization (2Pr) of 102.6 µC/cm2 is achieved for x = 0.05, connected to minimizing leakage and oxygen vacancy suppression. The typical ferromagnetic behavior with increased saturation magnetization from 4.4 emu/cm3 to 6.5 emu/cm3 by Y substitution possibly attributed to the suppressed spiral spin structure of G-type antiferromagnetism. The mechanisms of electric conduction behavior as functions of Y content and growth temperature are also discussed. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Iron compounds

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