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An anisotropic lattice Boltzmann-phase field model for dendrite growth and movement in rapid solidification of binary alloys

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npj Computational Materials 2024年第1期10卷 2591-2606页

作者： Shilin Mao Yuting Cao Wei Chen Dongke Sun Key Laboratory of Structure and Thermal Protection of High Speed Aircraft Ministry of EducationSchool of Mechanical EngineeringSoutheast UniversityNanjing 211189China Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing 211189China Department of Mechanical Engineering University of Michigan2350 Hayward St.G.G.Brown BuildingAnn ArborMI 48109USA Power Beam Processing Lab AVIC Manufacturing Technology InstituteBeijing 100024China

A model coupling the lattice Boltzmann and the phase field methods with anisotropic effects is proposed,which is used to numerically describe the growth and movement of dendrites in rapid solidification of *** model is quantitatively validated by the simulation of the continuous growth and the drafting-kissing-tumbling phenomenon of two falling particles.

关键词： solidification alloys anisotropic

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Characterization of deformation transition in the rolled LZ91 magnesium alloy under tensile loading

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Journal of Magnesium and Alloys 2024年第8期12卷 3173-3179页

作者： Yutaka Yoshida Jun-ichi Shibano Jyunpei Hagikura Ryuhei Misutani Yuto Monden Faculty of Engineering Kitami Institute of TechnologyKoen-choKitamiHokkaido 090-8507Japan Department of Mechanical Engineering Kitami Institute of TechnologyKoenchoKitamiHokkaido 090-8507Japan School of Regional Innovation and Social Design Engineering Intelligent Machines and Biomechanics Course Program Kitami Institute of TechnologyKoen-choKitamiHokkaido 090-8507Japan

In this study,the mechanical behavior of crystal group of hexagonal close-packed(hcp;αphase)and body-centered cubic(bcc;βphase)during tensile loading was investigated to elucidate the mechanism from elastic to plastic deformation transition of the rolled LZ91 Mg alloy using transmission-X-ray diffraction(transmission-XRD)measurement,transmission electron microscopy(TEM),scanning transmission electron microscopy(STEM),energy dispersive X-ray spectroscopy(EDS).The approximate proof stress of the LZ91 Mg alloy sample was found that the lattice strain retained the expanded state from 0.6%nominal strain,and the transmission-XRD measurement characterized the crystalline behavior during the transition by the integrated intensity of crystal group hcp(100).The lattice strain of bcc(110)decreased from the 0.6%nominal strain due to dislocation activity,which occurred nearβ/βgrain *** addition,we performed the analyses of electron energy loss spectroscopy(EELS)modes,the Li-K peak disappeared from the segregated Li regions of 10–60 nm nearβ/βgrain boundary at the nominal strain of 0.8%.Understanding this mechanical behavior during the elastic to plastic deformation transition by transmission-XRD is crucial for the development of Mg-Li alloys.

关键词： Magnesium-lithium alloy Plastic deformation X-ray diffraction Scanning/transmission electron microscopy Electron energy loss spectroscopy

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Extracellular matrix-templating fibrous hydrogels promote ovarian tissue remodeling and oocyte growth

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Bioactive Materials 2024年第2期32卷 292-303页

作者： Claire E.Nason-Tomaszewski Emily E.Thomas Daniel L.Matera Brendon M.Baker Ariella Shikanov Department of Biomedical Engineering University of MichiganAnn ArborMI 48109USA Department of Chemical Engineering University of MichiganAnn ArborMI 48109USA Department of Obstetrics and Gynecology University of MichiganAnn ArborMI 48109USA Cellular and Molecular Biology Program University of MichiganAnn ArborMI 48109USA

Synthetic matrices which mimic the extracellular composition of native tissue create a comprehensive model for studying development and ***,we have engineered a composite material which retains cell-secreted ECM for the culture of ovarian follicles by embedding electrospun dextran fibers functionalized with basement membrane binder(BMB)peptide in PEG *** the presence of ECM-sequestering fibers,encapsulated immature primordial follicles and ovarian stromal cells aggregated into large organoid-like structures with dense deposition of laminin,perlecan,and collagen I,leading to steroidogenesis and significantly greater rates of oocyte survival and *** determined that cell aggregation restored key cell-cell interactions critical for oocyte survival,whereas oocyte growth was dependent on cell-matrix interactions achieved in the presence of *** we have shown that sequestration and retention of cell-secreted ECM along synthetic fibers mimics fibrous ECM structure and restores the cell-cell and cell-matrix interactions critical for engineering an artificial ovary.

关键词： Biomimetic matrix Ovarian follicle Fibrous hydrogels

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Recent advances in lung-on-a-chip technology for modeling respiratory disease

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Bio-Design and Manufacturing 2023年第5期6卷 563-585页

作者： Jorge A.Tavares-Negrete Prativa Das Sahar Najafikhoshnoo Steven Zanganeh Rahim Esfandyarpour Department of Electrical Engineering University of CaliforniaIrvineCA 92697USA Department of Biomedical Engineering University of CaliforniaIrvineCA 92697USA Henry Samueli School of Engineering University of CaliforniaIrvineCA 92697USA Laboratory for Integrated Nano Bio Electronics Innovation Henry Samueli School of EngineeringUniversity of CaliforniaIrvineCA 92697USA Department of Mechanical and Aerospace Engineering University of CaliforniaIrvineCA 92697USA Department of Bioengineering University of Massachusetts DartmouthDartmouthMAUSA

Tissue engineering approaches,including those to functional lung tissues,are finely honed by the inclusion of upgraded devices that mimic biophysical and biochemical features in *** culture is one of these essential biophysical characteristics enabled by the introduction of microfluidic devices in recent *** review links the importance of dynamic culture for in vitro maintenance of functional lung cells to the modeling of respiratory *** identify and discuss different parameters for fabricating the requisite microfluidic models for lung cells,as well as their application in modeling lung diseases caused by external factors such as smoking and *** possibility of creating a multi-organ-on-a-chip to establish a more physiologically relevant model is ***,the focus is on different prospects for the in vitro modeling approach and for lungs-on-a-chip for developing advanced,reliable technology to analyze the pathophysiology of respiratory diseases and screen potential treatments.

关键词： Lung-on-a-chip In vitromodeling Lung pathophysiology Respiratory diseases 3D culturemodel

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mechanical Evaluation of the PEEK Cranial Implants 61

Mechanical Evaluation of the PEEK Cranial Implants

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61st International Scientific Conference on Experimental Stress Analysis, EAN 2023

作者： Varga, Patrik Tóth, Teodor Hudák, Radovan Huňady, Róbert Kostka, Ján Department of Biomedical Engineering and Measurement Faculty of Mechanical Engineering Technical University of Košice Letná 1/9 Sever Košice042 00 Slovakia Department of Applied Mechanics and Mechanical Engineering Faculty of Mechanical Engineering Technical University of Košice Letná 1/9 Sever Košice042 00 Slovakia

ISBN: (纸本)9788055336770

Additive manufacturing and new polymeric progressive biocompatible materials enable the production of individual cranial implants. The advantage of this approach is a reduction in the number of complications during surgery due to inaccuracies in the design and manufacture of the implant. Critical areas of implants are their attachment to the skull and their mechanical properties. The paper deals with the finite element method analysis of force action on a cranial implant made of PEEK. The simulation was made for two methods of fixing the implant to the skull, where in case A, they were used to fix the screw, and in case B, it was only about placing the implant on the defect without fixing it to the bone. © 2024 EAN 2023 - 61st Conference on Experimental Stress Analysis, Proceedings of Full Papers. All rights reserved.

关键词： Finite element method

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Unobstructive andsafe-to-wear watt-level wireless charger

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npj Flexible Electronics 2024年第1期8卷 117-131页

作者： Sangjun Kim Jonathan Wells Sarnab Bhattacharya Hamsi Nathan Jiaming He Isabella Tubilla Heeyong Huh Pooja Kakani Ali Farshkaran Praveenkum Pasupathy Jianshi Zhou Emily Porter Nathan Lazarus Nanshu Lu Department of Mechanical Engineering The University of Texas at AustinAustinTXUSA Department of Electrical and Computer Engineering The University of Texas at AustinAustinTXUSA Department of Biomedical Engineering The University of Texas at AustinAustinTXUSA Texas Materials Institute The University of Texas at AustinAustinTXUSA Department of Aerospace Engineering and Engineering Mechanics The University of Texas at AustinAustinTXUSA Department of Electrical and Computer Engineering University of DelawareNewarkDEUSA US Army Research Laboratory AdelphiMDUSA

A wearable microgrid that centralizes and distributes harvested energy across different body regions can optimize power utilization and reduce overall battery *** setup underscores the importance of developing cable-free wireless power transfer(WPT)systems for mobile and portable devices to eliminate the risks posed by wired connections,especially in dynamic and hazardous *** introduce a thin,stretchable,and safe hand band capable of watt-level wireless charging through the widely adopted Qi protocol operating at 130 *** implementation of nonadhesive fabric encapsulation serves to protect the 50-μm-thin spiral copper antenna from mechanical strain,ensuring an overall hand band stretchability of 50%.We also create a stretchable“Ferrofabric”,characterized by a magnetic permeability of 11.3 and a tensile modulus of 75.3 kPa,that provides magnetic shielding for the antenna without compromising ***“Ferrofabric”improves the coil inductance but induces core loss in AC *** fully understanding and managing loss mechanisms such as the skin effect,proximity effect,core loss,and joule heating,we achieve a wireless charging efficiency of71%andpower delivery of 3.81Win the kHz frequency *** band is unobstructive to hand motion and can charge a handheld smartphone as fast as a desktop charger or power a battery-free chest-laminated e-tattoo sensor,with well-managed thermal and electromagnetic *** a holistic electromagnetic,structural,and thermal design,our device culminates in a safe,rugged,and versatile solution for wearable WPT systems.

关键词： antenna charge wear

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Bringing Bearing Fault Detection to Embedded Systems Using Low-Cost Machine Learning Techniques

Bringing Bearing Fault Detection to Embedded Systems Using L...

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2024 IEEE Latin American Conference on Computational Intelligence, LA-CCI 2024

作者： Teixeira, Natalia S. Pastrana, M.A. Moura, Henrique G. Munoz, Daniel M. University of Brasilia Faculty of Gama Automotive Engineering Undergraduate Program Brasilia Brazil University of Brasilia Department of Mechanical Engineering Mechatronics Graduate Program Brasilia Brazil University of Brasilia Faculty of Gama Electronics Engineering Undergraduate Program Brasilia Brazil

ISBN: (纸本)9798350374575

Vibration analysis is crucial for predictive maintenance of bearing systems, aiming to reduce costs and prevent failures. This paper investigates signal processing techniques such as FFTs and Hilbert Transforms for fault diagnosis, alongside decision tree models, particularly the J48 algorithm within the WEKA environment, for fault classification. The study emphasizes the integration of signal processing and machine learning for effective fault diagnosis and maintenance. Notably, a classification model with low computational cost has been chosen, facilitating implementation in embedded systems. This model also offers interpretability of outputs, as it is based on decision trees of frequency components obtained through preprocessing. © 2024 IEEE.

关键词： Predictive maintenance

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Sub-optimal Perceptron Controller Using WOA Algorithm for Farming Watering Mobile Robot

Sub-optimal Perceptron Controller Using WOA Algorithm for Fa...

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2024 IEEE Latin American Conference on Computational Intelligence, LA-CCI 2024

作者： Pastrana, M.A. Oliveira, L.H. Bautista, J. Pinto-Lopera, Jesus Mendoza-Penaloza, Jose Munoz, Daniel M. University of the Amazonia Faculty of Engineering Systems Undergraduate Program Florencia Caquetá Colombia University of Brasilia Mechatronics Graduate Program Department of Mechanical Engineering Brasilia Brazil University of Brasilia Faculty of Gama Electronics Engineering Undergraduate Program Brasilia Brazil

ISBN: (纸本)9798350374575

Artificial neural networks (ANNs) are intricate mathematical models, drawing inspiration from the biological nervous system, and offering intelligence alongside nonparametric capabilities. The efficacy of ANNs heavily relies on their learning process. Heuristic search algorithms have been proposed in literature as reliable options for optimizing neural networks utilizing the Perceptron architecture. This paper presents an suboptimal neural network Perceptron training method employing the Whale Optimization Algorithm for the application of farming watering mobile robots. To achieve this, a fitness function based on system responses such as overshoot, settling Time, and steady-state Error was developed. The sub-optimal Perceptron controller was then implemented using MATLAB, CoppeliaSim software and the EVA robot, resulting in a 66.17% overshoot, a 4.7% steady-state error, and a settling time of 3.05 seconds. Moreover, the sub-optimal Perceptron controller was mapped onto a System on Chip FPGA AMD-Xilinx Zynq 7020, resulting in a hardware resources consumption of 1,870 (3.52%) Lookup table, 2 (0.9%) Digital Signal Processing blocks, 1,019 (0.96%) Flip-Flops and a power consumtion of 0.005 W. Finally, Hardware-in-The-Loop validation was performed using CoppeliaSim, Python, Universal Direct Memory Access, and the EVA robot. The results showed an overshoot of 94.83%, a settling time of 2 seconds, and a steady-state error of 4.5%. © 2024 IEEE.

关键词： MATLAB

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Real-time trajectory optimization for powered planetary landings based on analytical shooting equations

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Chinese Journal of Aeronautics 2022年第7期35卷 91-99页

作者： Lin CHENG Peng SHI Shengping GONG Zhenbo WANG School of Astronautics Beihang UniversityBeijing 100191China Department of Mechanical Aerospaceand Biomedical EngineeringUniversity of TennesseeKnoxville 37996USA

Traditionally,numerical trajectory integration for shooting equation calculation and iterations for shooting with randomly guessed initial solutions deteriorate the real-time performance of indirect methods for on-board *** this study,the indirect method is improved to achieve real-time trajectory optimization of fuel-optimal powered planetary landings with the help of analytical shooting equation derivations and a practical homotopy ***,the contributions of this paper are ***,the analytical expressions for shooting equation calculation are derived to replace the traditional time-consuming trajectory ***,the computational efficiency is significantly ***,the original three-dimensional landing problem is connected with a simplified one-dimensional problem that only involves the vertical dynamics,and its analytical solution is obtained based on Pontryagin’s minimum ***,starting with the analytical solution,the accurate solution of the original landing problem can be obtained through an adaptive homotopy *** results of Earth landing scenarios are given to substantiate the effectiveness of the proposed techniques and illustrate that the developed method can obtain a fuel-optimal landing trajectory in 5 ms with 100%success rate.

关键词： Adaptive homotopy Analytical solution Fuel-optimal landings Indirect method Real-time control

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A COMPREHENSIVE METHODOLOGY FOR CALCULATING THE THEORETICAL, TECHNICAL, AND ECONOMIC POTENTIALS OF BIOMASS RESIDUES: A CASE STUDY OF MINAS GERAIS, BRAZIL 32nd

A COMPREHENSIVE METHODOLOGY FOR CALCULATING THE THEORETICAL,...

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32nd European Biomass Conference and Exhibition, EUBCE 2024

作者： Filho, Fernando Bruno Dovichi Lora, Electo Eduardo Silva Maya, Diego Yepes Palacio, Jose Carlos Escobar Mayer, Flavio Dias Venturini, Osvaldo Jose Errera, Marcelo Risso Program of Energy Engineering Institute of Mechanical Engineering Federal University of Itajubá Brazil Chemical Engineering at the Federal University of Santa Maria Brazil Department of Environmental Engineering Federal University of Parana Brazil

The present investigation aims to determine the technical and economic potentials of electricity generation from different types of biomasses in the state of Minas Gerais, using different electricity generation technologies, supported by different thermochemical combustion and gasification routes. The five most available biomasses in the state of Minas Gerais were selected: corn, soybeans, coffee, eucalyptus and sugar cane, whose crops produce residues that can be used for electricity generation. Considering the technical, logistical and economic data of the selected biomasses, the research sought to define the most viable types of residual biomass for electricity generation, in different locations within the state, through a multi-criteria decision-making approach (MCDM). A bibliographic review of the maturity of different types of electricity generation technologies from biomass was carried out, based on available information, schemes and operational parameters of real installations. The level of technological readiness of the different alternatives was also evaluated through a survey with specialists in the sector, concluding that the technologies with the highest level of readiness are the conventional Rankine cycle, the organic Rankine cycle and the use of gasifiers integrated with internal combustion. These three technological alternatives were adopted as options for the generation of electricity from biomass, obtaining a scale of the types of biomasses available, through a multicriteria methodology. The determination of the criteria weight was carried out from an integration with the analytical hierarchy process (AHP). In conjunction with a GIS-MCDA approach, different micro-regions were evaluated considering their respective biomass resources, allowing the estimation of costs and performance of different electricity production technologies. A logical algorithm was developed for the selection of alternatives for energy production from biomass, giving priority

关键词： Operating costs

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