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SSRN 2023年

作者： Qian, Hongtao Yang, Zhengyu Zhang, Xiaofei Feng, Jie Li, Cheng Department of Mechanical Engineering Guangdong Technion Israel Institute of Technology Shantou515000 China Department of Mechanical Science & Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Mechanical Engineering Technion-Israel Institute of Technology Haifa3200003 Israel Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion-Israel Institute of Technology Shantou515063 China

The air bubble bursting dynamics involve intricate interfacial phenomena of millisecond timescale, which are of interest in many natural and industrial processes. The current study concerns bubble containing oil droplets with size comparable to bubble cap thickness. The assumption is that the dynamics of bubble bursting and aerosol formation will be modified as oil droplets interact with the air-water interface during drainage. Indeed, the experiments show that with the increase of the droplet spreading coefficient (S), the average film retraction speed decreases and the average film thickness increases at breakup. Notably, as S reaches 3.6 mN/m, a distinct multiple hole formation phenomenon has been observed for the first time during bubble bursting. The frequency of multiple hole formation increases with increasing S, and is as high as 22 holes per bursting event observed when S = 21.3 mN/m. The multiple holes evolve with time and form convoluted ligament structures that finally break up into much more aerosolized droplets. However, after normalization, all droplet size distribution is well predicated by a Gamma *** results highlight the importance of the interfacial physiochemistry for the bubble cap rupture, regarding the wetting state between the oil droplets, air, water phase. © 2023, The Authors. All rights reserved.

关键词： Emulsification

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Hierarchically porous composite fabrics with ultrahigh metal–organic framework loading for zero-energy-consumption heat dissipation

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science Bulletin 2022年第19期67卷 1991-2000页

作者： Xiangyu Liu Pengli Li Jie Chen Pingkai Jiang Yiu-Wing Mai Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingDepartment of Polymer Science and EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China Centre for Advanced Materials Technology School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydney NSW 2006Australia

The long-term safe operation of high-power equipment and integrated electronic devices requires efficient thermal management,which in turn increases the energy consumption ***,the sustainable development of our society needs advanced thermal management with low,even zero,energy *** water from the atmosphere,followed by moisture desorption to dissipate heat,is an efficient and feasible approach for zero-energy-consumption thermal ***,current methods are limited by the low absorbance of water,low water vapor transmission rate(WVTR)and low stability,thus resulting in low thermal management *** this study,we report an innovative electrospinning method to process hierarchically porous metal–organic framework(MOF)composite fabrics with high-efficiency and zero-energy-consumption thermal *** composite fabrics are highly loaded with MOF(75 wt%)and their WVTR value can be up to 3138 g m^(-2) d^(-1).The composite fabrics also exhibit stable microstructure and *** a conventional environment(30℃,60%relative humidity),the composite fabrics adsorb water vapor for regeneration within 1.5 h to a saturated value Wsat of 0.614 g g^(-1),and a corresponding equivalent enthalpy of 1705.6 J g^(-1).In the thermal management tests,the composite fabrics show a strong cooling capability and significantly improve the performance of thermoelectric devices,portable storage devices and wireless *** results suggest that hierarchically porous MOF composite fabrics are highly promising for thermal management of intermittent-operation electronic devices.

关键词： Metal-organic framework Hierarchically porous materials Adsorption-based cooling Electrospinning

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Shrinkage of alginate hydrogel bioinks potentially used in 3d bioprinting technology 3rd

Shrinkage of alginate hydrogel bioinks potentially used in 3...

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3rd International Symposium on Material science and engineering, ISMSE 2020 and 4th International Conference on Advanced Material and engineering Structural Technology, ICAMEST 2020

作者： Labowska, Magdalena Beata Jankowska, Agnieszka Maria Michalak, Izabela Detyna, Jerzy Department of Mechanics Materials and Biomedical Engineering Faculty of Mechanical Engineering Wroclaw University of Science and Technology Smoluchowskiego 25 Wroclaw50-370 Poland Faculty of Chemistry Wroclaw University of Science and Technology Smoluchowskiego 25 Wroclaw50-370 Poland

ISBN: (纸本)9783035717952

Hydrogels are cross-linked polymeric structures, which consist of up to approximately 90% water, the remainder is polymer chain. Retention of large volumes of water in the intermolecular space is related to the presence of hydrophilic functional groups in the network. The unique hydrogels properties, such as porosity, and biological and mechanical properties, make them suitable for a wide range of applications, especially in the medical sector. Furthermore, ease of modification and good printability are expected in 3D bioprinting technologies. Nevertheless, to maintain their structure and softness, hydrogels must be stored in suitable conditions to prevent water vaporization. The water removal from the hydrogel network results in weight reduction, structural and volumetric changes. It is a considerable challenge for the printouts manufactured by 3D bioprinting technology, where hydrogel products are exposed to drying during the production process, which may affect their shape change and shrinkage. The paper presents a cross-linking process of a hydrogel based on sodium alginate and the shrinkage of dried hydrogels depending on the cross-linking procedure. An investigation focused on the alginate hydrogel water content, as well as shrinkage of alginate hydrogel degree depending on the concentration of the cross-linking (CaCl2) solution and the duration of the process. For longer cross-linking time or using higher cross-linking agent concentration, the crosslinking was more efficient. However, it is necessary to optimize the parameters for the bioprinting process. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Shrinkage

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Subdivision Surface-Based Isogeometric Boundary Element Method for Steady Heat Conduction Problems with Variable Coefficient

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Computer Modeling in engineering & sciences 2021年第10期129卷 323-339页

作者： Xiuyun Chen Xiaomeng Yin Kunpeng Li Ruhui Cheng Yanming Xu Wei Zhang School of Architectural Engineering Huanghuai UniversityZhumadian463003China College of Intelligent Construction Wuchang University of TechnologyWuhan430223China College of Civil Engineering and Architecture China Three Gorges UniversityYichang443000China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei230026China

The present work couples isogeometric analysis(IGA)and boundary element methods(BEM)for three dimensional steady heat conduction problems with variable *** Computer-Aided Design(CAD)geometries are built by subdivision surfaces,and meantime the basis functions of subdivision surfaces are employed to discretize the boundary integral equations for heat conduction ***,the radial integration method is adopted to transform the additional domain integrals caused by variable coefficients to the boundary *** numerical examples are provided to demonstrate the correctness and advantages of the proposed algorithm in the integration of CAD and numerical analysis.

关键词： Subdivision surface isogeometric boundary element method heat conduction radial integration

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Accelerated Multi-Objective Alloy Discovery Through Efficient Bayesian Methods: Application to the FCC High Entropy Alloy Space

SSRN

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SSRN 2025年

作者： Hastings, Trevor Mulukutla, Mrinalini Khatamsaz, Danial Salas, Daniel Xu, Wenle Lewis, Daniel Person, Nicole Skokan, Matthew Miller, Braden Paramore, James Butler, Brady Allaire, Douglas Attari, Vahid Karaman, Ibrahim Pharr, George M. Srivastava, Ankit Arróyave, Raymundo Department of Materials Science and Engineering College StationTX77843-3003 United States DEVCOM Army Research Laboratory South at Texas A&M University College StationTX77843-3003 United States Texas A&M University Department of Mechanical Engineering College StationTX77843 United States

This study introduces BIRDSHOT, an integrated Bayesian materials discovery framework designed to efficiently explore complex compositional spaces while optimizing multiple material properties. We applied this framework to the CoCrFeNiVAl FCC high entropy alloy (HEA) system, targeting three key performance objectives: ultimate tensile strength/yield strength ratio, hardness, and strain rate sensitivity. The experimental campaign employed an integrated cyber-physical approach that combined vacuum arc melting (VAM) for alloy synthesis with advanced mechanical testing, including tensile and high-strain-rate nanoindentation testing. By incorporating batch Bayesian optimization schemes that allowed the parallel exploration of the alloy space, we completed five iterative design-make-test-learn loops, identifying a non-trivial three-objective Pareto set in a high-dimensional alloy space. Notably, this was achieved by exploring only 0.15% of the feasible design space, representing a significant acceleration in discovery rate relative to traditional methods. This work demonstrates the capability of BIRDSHOT to navigate complex, multi-objective optimization challenges and highlights its potential for broader application in accelerating materials discovery. © 2025, The Authors. All rights reserved.

关键词： Tensile testing

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Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites

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Nano Research 2020年第5期13卷 1339-1346页

作者： Enzheng Shi Shuang Cui Nicholas Kempf Qingfeng Xing Thomas Chasapis Huazhang Zhu Zhe Li Je-Hyeong Bahk G.Jeffrey Snyder Yanliang Zhang Renkun Chen Yue Wu Department of Chemical and Biological Engineering Iowa State UniversityAmesIA 50011USA Ames Laboratory Department of EnergyIowa State UniversityAmesIA 50011USA Department of Mechanical and Aerospace Engineering University of California-San DiegoLa JollaCA 92093USA Buildings and Thermal Sciences Center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Aerospace and Mechanical Engineering University of Notre DameNotre DameIN 46556USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Mechanical and Materials Engineering University of CincinnatiCincinnatiOH 45221USA

Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric ***,the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so ***,we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride(BiSbTe)thermoelectric nanocomposites fabricated from solution-synthesized *** figure of merit can reach 1.18,which,however,can be overestimated to 1.88 without considering the *** study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity,textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy *** finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.

关键词： bismuth antimony telluride solution synthesis thermoelectrics inhomogeneity

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Emerging Neuroimaging Approach of Hybrid EEG-fNIRS Recordings: Data Collection and Analysis Challenges

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Data science in science 2024年第1期3卷

作者： Pinto-Orellana, Marco Antonio Khan, Haroon Ombao, Hernando Mirtaheri, Peyman Biomedical Engineering Department University of California Irvine Irvine CA United States Department of Mechanical Electronics and Chemical Engineering Oslomet–Oslo Metropolitan University Oslo Norway Statistics Program King Abdullah University of Science and Technology Thuwal Saudi Arabia

The hybrid EEG-fNIRS (electroencephalogram - functional near-infrared spectroscopy) modality provides a comprehensive understanding of brain activity by simultaneously capturing electrical and hemodynamic responses. It takes advantage of the temporal resolution in EEG with the good spatial resolution of fNIRS. This hybrid system is non-invasive, portable, and relatively affordable compared to functional magnetic resonance imaging (fMRI). Despite its inherent limitations, EEG-fNIRS systems can be a valuable tool in neuroimaging, suitable for cognitive and clinical research that requires temporal and spatial information about brain function. They are well-suited in naturalistic experimental settings, brain-computer interface applications, and disease diagnosis. This paper also explores electro-metabolic interactions in the motor cortex during left- and right-hand grip tasks. We analyzed cross-frequency coupling (CFC) between delta rhythms (0–4Hz) and oxyhemoglobin (HbO) and deoxyhemoglobin (HbR) concentrations calculated from fNIRS. CFC was estimated as the correlation between HbO, HbR, and the instantaneous amplitude of delta signals. CFC cannot be studied with non-synchronous measurements and is not directly related to activation amplitudes. Based on previous fMRI-EEG studies, some categories of oscillations denote a negligible correlation with fNIRS signals. However, our results showed a contra-lateral coupling between delta-EEG and HbO with significant pattern differences in the left motor cortex. © 2024 The Author(s). Published with license by Taylor & Francis Group, LLC.

关键词： cross-frequency coupling data pre-processing electrical-hemodynamic coupling Hybrid EEG-fNIRS statistical modeling synchronization

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Application Research of Computational Design Aesthetics

Application Research of Computational Design Aesthetics

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Intelligent Design (ICID), International Conference on

作者： Ding Zhou Jiawei Huang Yukun Zhang Bingjian Liu School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Department of Mechanical Materials and Manufacturing Engineering University of Nottingham Ningbo China Ningbo China

This study explores the application of computational design aesthetics to conform to Chinese aesthetic standards in customized glasses frames. Through quantitative analysis, it examines the impact of key design variables (upper frame position, middle beam height, and lower frame position) on the aesthetics of wearing. The results indicate that achieving a better aesthetic feeling can be attained when the upper frame of the glasses is approximately 20% above the vertical distance between the eyebrow and eye, the middle beam is about 20% above the height of the frame, or the lower frame is roughly 40% above the vertical distance between the lower eyelid and the angle of the mouth. These findings hold significant value for the eyewear industry and cultural confidence. They empower enterprises to leverage computational design tools, enhancing the harmony and attractiveness of individual facial frames, catering to the preferences of the Chinese market, and deepening the understanding of cultural factors in aesthetic perception. Furthermore, it contributes to realizing the goal of socialist cultural confidence with Chinese characteristics. In conclusion, this study is a valuable reference for creating eyewear frames that exude individual and cultural confidence, fostering innovation in the eyewear industry and the principles of harmonious design aesthetics.

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The journey of multifunctional bone scaffolds fabricated from traditional toward modern techniques

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Bio-Design and Manufacturing 2020年第4期3卷 281-306页

作者： Ashkan Bigham Firoozeh Foroughi Erfan Rezvani Ghomi Mohammad Rafienia Rasoul Esmaeely Neisiany Seeram Ramakrishna Department of Biomaterials Tissue Engineering and NanotechnologySchool of Advanced Technologies in Medicine(ATiM)Isfahan University of Medical SciencesIsfahanIran Department of Materials Science and Engineering Faculty of EngineeringNational University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Mechanical Engineering Center for Nanofibers and NanotechnologyNational University of SingaporeSingapore 119260Singapore Biosensor Research Center Isfahan University of Medical SciencesIsfahanIran Department of Materials and Polymer Engineering Faculty of EngineeringHakim Sabzevari University*** SabzevarIran

As a bone scaffold,meeting all basic requirements besides dealing with other bone-related issues-bone cancer and accelerated regeneration-is not expected from traditional scaffolds,but a newer class of scaffolds called *** a clinical point of view,being a multifunctional scaffold means reducing in healing time,direct costs-medicine,surgery,and hospitalization-and indirect costs-loss of mobility,losing job,and *** main aim of the present review is following the multifunctional bone scaffolds trend to deal with both bone regeneration and cancer *** consideration is given to different fabrication techniques which have been applied to yield these materials spanning from traditional to modern ***,the hierarchical structure of bone plus bone cancers and available medicines to them are introduced to familiarize the potential reader of review with the pluri-disciplinary essence of the ***,a brief discussion relating to the future trend of these materials is provided.

关键词： Multifunctional scaffolds Bone cancer Fabrication techniques Bone tissue regeneration

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Anti-Termite Activity of Azadirachta excelsa Seed Kernel and Its Isolated Compound against Coptotermes curvignathus

Journal of the Korean Wood Science and Technology

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Journal of the Korean Wood science and Technology 2023年第3期51卷 157-172页

作者： Adfa, Morina Wiradimafan, Khafit Pratama, Ricky Febri Sanjaya, Angga Triawan, Deni Agus Yudha S., Salprima Ninomiya, Masayuki Rafi, Mohamad Koketsu, Mamoru Department of Chemistry Faculty of Mathematics and Natural Sciences University of Bengkulu Bengkulu38371 Indonesia Research Center of Sumatera Natural Product and Functional Materials University of Bengkulu Bengkulu38371 Indonesia Master of Chemistry Study Program Faculty of Mathematics and Natural Sciences University of Bengkulu Bengkulu38371 Indonesia Department of Chemistry and Biomolecular Science Faculty of Engineering Gifu University Gifu5011193 Japan Department of Chemistry Faculty of Mathematics and Natural Sciences IPB University Bogor16128 Indonesia Tropical Biopharmaca Research Center-Institute of Research and Community Services IPB University Bogor16128 Indonesia

Azadirachta excelsa, is a plant belonging to the same genus as Indian neem (Azadirachta indica), and its use as a pesticide is reported by few studies. Despite being a different species, it is expected to have the same biopesticide potential as A. indica. Therefore, this study aims to investigate the anti-termite activity of n-hexane and methanol extracts of A. excelsa seed kernel at various concentrations against Coptotermes curvignathus. The methanol extract demonstrated greater termicidal activity than n-hexane at doses test of 2%, 4%, and 8%. It also showed 100% termite mortality on the third day of administering the 8% dose. According to the gas chromatography with mass spectrometry data, the putative main components of the n-hexane extract were hexadecanoic acid, ethyl ester (18.99%), 9,12-octadecadienoic acid (Z,Z)-(16.31%), and 9-octadecenal (16.23%). In contrast, the principal constituents of methanol extract were patchouli alcohol (28.1%), delta-guaiene (15.15%), and alpha-guaiene (11.93%). Furthermore, limonoids profiling of A. excelsa methanol extract was determined using Ultrahigh-performance liquid chromatography coupled with quadrupole-Orbitrap high-resolution mass spectrometry. The number of limonoids identified tentatively was fifteen, such as 6-deacetylnimbin, nimbolidin C, nimbolide, 6-acetylnimbandiol, 6-deacetyl-nimbinene, salannol, 28-deoxonimbolide, gedunin, nimbandiol, epoxyazadiradione, azadirone, 2',3'-dihydrosalannin, marrangin, nimbocinol, and azadirachtin. They were the same as those reported in the seed and leaves of A. indica, but its largest component in A. excelsa was 6-deacetylnimbin. As a result, the presence of these compounds may be responsible for the anti-termite activity of A. excelsa seed kernel extract. Additionally, column chromatography of methanol extract yielded 6-deacetylnimbin, which was found to be antifeedant and termiticide against C. curvignathus. © 2023 The Korean Society of Wood science & Technology.

关键词： Mass spectrometry

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