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ACS Electrochemistry 2025年第4期1卷 516-522页

作者： Charles Soulen Stewart Sherrit Erik Brandon Ping Liu Program of Materials Science and Engineering University of California San Diego 9500 Gilman Drive La Jolla California 92093 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena California 91109 United States Program of Materials Science and Engineering University of California San Diego 9500 Gilman Drive La Jolla California 92093 United States；Aiiso Yufeng Li Department of Chemical and Nano Engineering University of California San Diego 9500 Gilman Drive La Jolla California 92093 United States

The mechanical properties of lithium-ion batteries (LIB) are closely related to their state-of-charge (SOC) and state-of-health (SOH). Here, we introduce an in-operando acoustic technique based on acoustic impedance spectroscopy (AIS) which probes the mechanical changes that occur in the LIB during operation. Using thin, inexpensive piezoelectric resonators and widely available impedance analyzers, we can identify the acoustic resonances of commercial LIBs by measuring the complex electrical impedance of the resonator. In-operando AIS shows that these resonances are dependent on the bulk mechanical properties of the LIB, which change reversibly as the cell is cycled. We show that this technique can provide substantial information on both the SOC and SOH of a commercial LIB.

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mechanical AND ELECTRICAL CHARACTERIZATION OF 3D PRINTED POLYAMIDE 6 NANOGRAPHENE COMPOSITE FOR ELECTROSTATIC DISCHARGE APPLICATIONS

MECHANICAL AND ELECTRICAL CHARACTERIZATION OF 3D PRINTED POL...

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SAMPE 2022 Conference and Exhibition

作者： Arigbabowo, Oluwasola K. Omer, Liam Tate, Jitendra Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551417

Polyamide 6 (PA 6) is an engineering thermoplastic that can be used to develop polymer nanocomposite with high potential in electrostatic discharge applications. By the incorporation of nanofillers in PA 6 to enhance multifunctional properties, PA 6 nanocomposites can serve as technological alternatives to commercial thermoplastics for 3D printing via fused deposition modelling (FDM). Hence, this study evaluated the mechanical and electrical properties of 3D printed PA6 nanographene composites for electrostatic discharge applications. 2, 4 and 6 wt.% of Graphene Nanoplatelets (GNP) was compounded with PA6 using co-rotating twin screw extruder to produce 1.75mm diameter monofilaments for FDM 3D printing. The test samples were printed using commercial-off-the-shelf (COTS) 3D printer, Lulzbot TAZ 6 FDM printer. Morphology, mechanical and electrical characterization was carried out according to their respective ASTM standard. An improvement in tensile and flexural properties were observed with an increase in nanographene addition, and a maximum improvement of 61.4 and 55.9% in tensile and flexural modulus respectively was recorded at 6wt% loading level. Electrical conduction of the insulative polyamide 6 matrix was enhanced by an appreciable reduction of its volume resistivity to 1011 Ω.cm by 2wt% nanographene loading, which seems promising for manufacturing static discharge products. Copyright 2022. Used by the Society of the Advancement of Material and Process engineering with permission.

关键词： Graphene

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On the origin of non-basal texture in extruded Mg-RE alloys and its implication for texture engineering

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Journal of Magnesium and Alloys 2024年

作者： Jin, X.Z. Yang, G.J. Xu, Xinyu Shan, D.B. Guo, B. He, B.B. Fan, C. Xu, W.C. National Key Laboratory for Precision Hot Processing of Metals & School of Materials Science and Engineering Harbin Institute of Technology Heilongjiang Harbin150001 China Zhejiang Institute of Modern Physics School of Physics Zhejiang University Zhejiang Hang Zhou310058 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China Department of Mechanical Engineering The University of Hong Kong Hong Kong999077 China

The work aims to investigate the formation and transformation mechanism of non-basal texture in the extruded Mg alloys. With this purpose a pure Mg as reference and eight Mg-Gd binary alloys with the Gd concentration ranging from 0.5 wt.% to 18 wt.% were prepared for extrusion. This study shows that the basal fiber texture in pure Mg transited into RE (rare earth) texture in diluted Mg-Gd alloys and into the abnormal C-texture in high-concentration Mg-Gd alloys. In pure Mg, discontinuous dynamic recrystallization plays a predominant role during the extrusion process, resulting in the formation of a typical basal fiber texture. Alloying with high concentration of Gd impedes the dynamic recrystallization process, facilitating the heterogeneous nucleation of shear bands as well as the dynamic recrystallization within shear bands. Dynamic recrystallized grains within shear bands nucleate with a similar orientation to the host deformed parent grains and gradually tilt their c-axis to the extrusion direction during growth by absorbing dislocations, leading to the formation of either the RE-texture orientation or the C-texture orientation, depending on the stored energy within shear bands. The analysis aided by IGMA and TEM characterization reveals that the shear bands originate from the extensive but heterogeneous activation of pyramidal I slip. Tensile tests illustrate a close correlation between the fracture elongation and texture types. A comprehensive understanding of the formation and transformation mechanism of different texture components in Mg alloys holds significant importance for the design of high-performance Mg alloys by texture engineering. © 2024

关键词： Magnesium alloys

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Edge Detection and Alignment Control Method for Mobile Robots based on multi-Lidar Fusion 5

Edge Detection and Alignment Control Method for Mobile Robot...

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5th World Robot Conference Symposium on Advanced Robotics and Automation, WRC SARA 2023

作者： Gao, He Tao, Yong Liu, Xiaonan Zhang, Yufan Liu, Haitao Wan, Jiahao Beihang University Research Institute of Aero-Engine Beijing102206 China Beijing New Materials and New Energy Technology Development Promotion Center Administrative Commission of Zhongguancun Science Park Beijing100191 China Beihang University School of Large Aircraft Engineering Beijing100191 China Beihang University School of Mechanical Engineering and Automation Beijing100191 China

ISBN: (纸本)9798350307320

Currently, there is a growing demand for intelligent maintenance of large-scale infrastructure, prompting a shift from manual to semi-automatic solutions in the control schemes of inspection robots. Mobile inspection robots play a crucial role in tasks such as flip-over inspection, fall prevention warning, defect identification, all of which necessitate edge detection and alignment processes. Laser alignment, with its high precision and low computational complexity, offers significant advantages over manual observation and visual alignment methods. This paper addresses practical engineering requirements by proposing a lidar-based structural edge detection algorithm and an automatic alignment controller. To validate the effectiveness of the proposed method, edge detection and alignment control experiments were conducted in a simulated environment. The results show that the edge detection algorithm reduces the direction detection error to 2.7°. The developed alignment controller exhibits a convergence time approximately 40% shorter than the standard PID controller. The proposed scheme effectively meets the accuracy and real-time requirements for edge detection and automatic alignment functions in mobile inspection robots and holds significant application potential for the infrastructure project's intelligent maintenance. © 2023 IEEE.

关键词： Alignment

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Sessile Binary Mixture Droplet Evaporation Cycle: Marangoni and Buoyancy Effects in Phase Transition

SSRN

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SSRN 2025年

作者： Zang, Zixun Zhang, Tianwei Yao, Ryan Zhu, Rui Hou, Xiaoya Zhang, Jie School of Mechanical Engineering Jiangnan University Jiangsu Key Lab of Advanced Food Manufacturing Technology 214100 China Institute of Advanced Technology Jiangnan University 214100 China The Grainger College of Engineering Materials Science and Engineering University of Illinois at Urbana-Champaign IL United States

Evaporation of a binary mixture droplet (BMD) is a fundamental physical phenomenon in nature that is widely applicable in inkjet printing, spray coating, microfluidics in medical diagnosis, surface cooling, and cleaning processes. In this study, the numerical model of the sessile BMDs in a pinned state is established to illustrate the impacts of selective evaporation, Marangoni and buoyancy effects, and continuum-compensated flow in droplet evaporation stages, where the flow characteristics and assessment criteria of the dynamic flow development are presented. Initially, Marangoni instability-driven flow (MIF) originates from the competition between thermal and solutal Marangoni effects, followed by chaotic flow with multiple vortices creation. As evaporation progresses, the droplet is stabilized to an internal axisymmetric vortex. When the majority of ethanol is depleted, the dominated capillary flow drives radial outward flow similar to that of pure water droplets. The transition stages are governed by the new dimensionless number of when Marangoni effects become fast decay for the chaotic flow to axisymmetric vortex phase transition, and the as the threshold for the subsequent transition to capillary flow, respectively. In principle, the manipulation of the solutally driven flow allows us to suppress the coffee-ring phenomenon and achieve more uniform deposition. © 2025, The Authors. All rights reserved.

关键词： Vortex flow

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Time-Dependent Low-Rank Input-Output Operator for Forced Linearized Dynamics with Unsteady Base Flows

arXiv

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arXiv 2023年

作者： Amiri-Margavi, Alireza Babaee, Hessam Department of Mechanical Engineering and Materials Science University of Pittsburgh 3700 O’Hara Street PittsburghPA15213 United States

Understanding the linear growth of disturbances due to external forcing is crucial for flow stability analysis, flow control, and uncertainty quantification. These applications typically require a large number of forward simulations of the forced linearized dynamics, often in a brute-force fashion. When dealing with simple steady-state or periodic base flows, there exist powerful and cost-effective solution operator techniques. Once these solution operators are constructed, they can be used to determine the response to various forcings with negligible computational cost. However, these methods do not apply to problems with arbitrarily time-dependent base flows. This paper develops and investigates reduced-order modeling with time-dependent bases (TDBs) to build low-rank solution operators for forced linearized dynamics with arbitrarily time-dependent base flows. In particular, we use forced optimally time-dependent decomposition (f-OTD), which extracts the time-dependent correlated structures of the flow response to various excitations. Several demonstrations are included to illustrate the utility of the f-OTD low-rank approximation for performing global transient stability analysis. Additionally, we demonstrate the application of f-OTD in computing the post-transient response of linearized Navier-Stokes equations to a large number of impulses, which has applications in flow control. © 2023, CC0.

关键词： Navier Stokes equations

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Study of SiGeSn-based Multiple Quantum Well Laser for Photonics Integrated Circuits 18

Study of SiGeSn-based Multiple Quantum Well Laser for Photon...

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Silicon Photonics XVIII 2023

作者： Olorunsola, Oluwatobi Said, Abdulla Ojo, Solomon Stanchu, Hryhorii Abernathy, Grey Amoah, Sylvester Saha, Samir Wangila, Emmanuel Grant, Joshua Acharya, Sudip Jheng, Yue-Tong Chang, Guo-En Li, Baohua Salamo, Gregory Yu, Shui-Qing Du, Wei Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States Material Science and Engineering Program University of Arkansas FayettevilleAR72701 United States Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States Department of Physics University of Arkansas FayettevilleAR72701 United States Department of Mechanical Engineering National Chun Cheng University Chiayi County62101 Taiwan Arktonics LLC 1339 South Pinnacle Drive FayettevilleAR72701 United States

ISBN: (纸本)9781510659575

As one of two mainstream platforms, photonics integrated circuits (PICs) on Si photonics platform benefits from the mature complementary metal-oxide-semiconductor (CMOS) manufacturing capabilities and allows for the processing of Si-based PICs with ultra-high volume and low cost. Recent studies of SiGeSn materials, which yield true direct bandgap with sufficient Sn incorporation, hold great promise for PICs featuring scalable, cost-effective, and power-efficient. While the exciting developments in bulk devices including lasers, light emitting diodes (LEDs), and photodetector were reported, the quantum wells (QWs) structure and devices have been investigated targeting the dramatically improved and/or novel device performance via variety of quantum confinement effects. In this work, we report the recent progress on SiGeSn QW development. Particularly, the study of MQW laser is presented. Devices with higher optical confinement factors exhibit clear lasing confirmed by the threshold characteristic and the emission spectra below and above threshold. Only spontaneous emission was observed with the thinner cap layer samples. On the other hand, samples with thicker cap layers of 250 and 290 nm exhibit clear lasing at 77 K with thresholds of 214 and 664 kW/cm2, respectively. These promising results establish the guidance for the device design and pave the way for the SiGeSn QW devices towards future high-performance PICs on Si platform. © 2023 SPIE.

关键词： Timing circuits

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Phase formation,texture evolutions,and mechanical behaviors of Al0.5CoCr0.8FeNi2.5V0.2 high-entropy alloys upon cold rolling

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Progress in Natural science:materials International 2022年第2期32卷 196-205页

作者： Tongtong Sun Weidong Song Feilong Shan Kaikai Song Kun Zhang Chuanxiao Peng Honggang Sun Lina Hu School of Mechanical Electrical & Information Engineering Shandong University State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology CAS Key Laboratory of Microgravity (National Microgravity Laboratory) Institute of Mechanics Chinese Academy of Sciences Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education) Shandong University

The cold rolling（CR） reduction dependence of microstructure evolutions and mechanical properties for Al0.5CoCr0.8FeNi2.5V0.2high-entropy alloy（HEA） were *** HEA remains FCC structures consisting of nanoscale ordered L12phase,confirming the phase formation *** increasing CR reduction,the textures transform from random ones to FCC rolling ones accompanied by dense slip bands and deformation *** a 50% CR reduction,the deformation textures started to become evident and were governed by typical {111}<112>F,{110}<100>Goss and {112}<111>Cu texture *** the CR reduction approached 90%,the deformation textures mainly contained the {110}<111>A,{114}<110>X,and {112}<111>Cu texture *** a result,both Vickers hardness and ultimate strength increased,but the ductility decreased *** enhanced strength should be attributed to the anisotropy and work hardening behavior from *** plastic deformation for the samples under low CR reductions was dominated by deformation twins and slip ***,under high CR reductions,the textures severely impeded the further propagation of pre-existing slip bands,leading to the rapid decrease of ***,the CR reduction should be carefully designed before optimal heat treatments to enhance the strength and ductility synergy.

关键词： High-entropy alloys Cold rolling Texture mechanical property Ductility

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Study on Measurement Method of Omnidirectional Receiver in Laser Scanning System

Study on Measurement Method of Omnidirectional Receiver in L...

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International Conference on Information, Communication and Networks (ICICN)

作者： Fei Liu Yaohui Zhi Libin Niu Qing Liu Xinfeng Wang Zhen Wang School of Materials Science and Engineering Xi’an University of Science and Technology Xi’an China School of Automation and Information Engineering Xi’an University of Technology Xi’an China School of Mechanical and Precision Instrument Engineering Xi’an University of Technology Xi’an China

High-accuracy laser positioning system (ALPS) is a distributed large-size rendezvous positioning system for indoor laser scanning, widely used in the assembly and manufacturing of large-size components. Due to the weak rendezvous measurement problem caused by spatial occlusion of laser planes in large space measurement, this paper proposes an omnidirectional spatial localization method based on circumferential bundle constraints and establishes an omnidirectional receiver measurement model. Compared with the traditional positioning methods, it can satisfy the position measurement under multi-station conditions as well as the high-precision measurement under single-station conditions, and at the same time, it can optimize the station deployment requirements of ALPS and realize the reception of circumferential 360° laser signals. The simulation results show that the repeatability error is better than ± 0.12mm, and the repeatability error of the three-axis attitude angle is within ± 0.035°, which meets the measurement accuracy requirements of the system, verifying the feasibility of the omnidirectional measurement method proposed in this paper and providing a theoretical basis for the omnidirectional measurement method of high-precision laser positioning system.

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Instabilities of longitudinal vortex rolls in katabatic Prandtl slope flows

arXiv

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arXiv 2023年

作者： Xiao, Cheng-Nian Senocak, Inanc Department of Mechanical Engineering and Materials Science University of Pittsburgh 3700 O’Hara St PittsburghPA15261 United States

Stationary counter-rotating longitudinal vortex pairs emerge from one-dimensional Prandtl slope flows under katabatic as well as anabatic conditions due to a linear instability when the imposed surface heat flux magnitude is sufficiently strong relative to the stable ambient stratification. For anabatic flows, these vortices have already been identified to exhibit an unique topology that bears a striking resemblance to speaker-wires since they stay coherent as a single unit without the presence of another vortex pair. Under katabatic conditions and at a constant Prandtl number, we find that the longitudinal vortices emerging at a range of different slope angles possess the similar topology as their anabatic counterparts. We determine the existence of both fundamental and subharmonic secondary instabilities depending on the slope angle for the most likely transverse base flow wavelength. Our results indicate that the most dominant instability shifts from a fundamental to subharmonic mode with increasing slope angle. At shallow slopes, this dynamic contrast with the speaker-wire vortices in anabatic slope flows at the same angle which for which the subharmonic instability is clearly dominant. These modes are responsible for the bending and movement of single or multiple speaker-wire vortices, which may merge or reconnect to lead to dynamically more unstable states, eventually leading to transition towards turbulence. We demonstrate that at sufficiently steep slopes, the dynamics of these vortex pairs are dominated by long-wave reconnections or two-dimensional mergers between adjacent pairs. © 2023, CC BY-SA.

关键词： Vortex flow

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