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ENHANCING IMPACT RESISTANCE AND VIBRATION PERFORMANCE OF COMPOSITE SANDWICH PANELS USING SHAPE MEMORY ALLOYS: A LITERATURE REVIEW AND IDENTIFICATION OF RESEARCH GAPS 50

ENHANCING IMPACT RESISTANCE AND VIBRATION PERFORMANCE OF COM...

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50th International Conference on Computers and Industrial engineering: Sustainable Digital Transformation, CIE 2023

作者： Thomas, K.K. Hassan, N.M. Bahroun, Z. Material Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Industrial Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9781713886952

Composite sandwich panels are widely used in aeros pace and civil applications due to their lightweight nature, strength, stiffness, corrosion resistance, and sound insulation properties. However, these panels often lack sufficient resistance to impact damage, resulting in reduced mechanical performance. Shape memory alloys (SMAs) have shown potential in improving the impact resistance of composite sandwich panels. SMAs can dissipate energy through phase transformations, leading to hysteresis loops in stress -strain diagrams during structural vibrations and impact loading. This paper presents a literature review of the use of SMAs in composite sandwich panels, focusing on their impact resistance and vibration performance. Various studies on incorporating SMA in composite panels have been analyzed, considering factors such as natural vibration, buckling behavior, impact resistance, energy absorption, and fracture behavior. The findings demonstrate that SMA can enhance the performance of composite sandwich panels, leading to improved impact resistance, reduced d eflection, increased contact forces, and enhanced energy absorption. However, the optimal configuration and parameters of SMA reinforcement in composite panels require further investigation. The review highlights current research trends and identifies gaps that can be addressed for further improvement in composite sandwich panels' performance. © 2023 Computers and Industrial engineering. All rights reserved.

关键词： Stress-strain curves

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A new role for universities in training the nuclear workforce

A new role for universities in training the nuclear workforc...

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Conference on Nuclear Training and Education 2015, CONTE 2015

作者： Littrell, Janet L. Cole, Daniel G. University of Pittsburgh Swanson School of Engineering Department of Mechanical Engineering and Material Science Nuclear Engineering Program Benedum Hall 3700 0 Hara Street PittsburghPA United States

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Low-velocity Impact Behavior of Sandwich Panels with Different Core Configurations: Numerical Study 50

Low-velocity Impact Behavior of Sandwich Panels with Differe...

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50th International Conference on Computers and Industrial engineering: Sustainable Digital Transformation, CIE 2023

作者： Charkaoui, Assil Hassan, Noha M. Bahroun, Zied Material Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Industrial Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9781713886952

Sandwich panels with cellular cores are increasingly prominent in several industries like marine, aerospace, and automotive, owing to their exceptional stiffness and strength-toweight ratio. Their adaptability is further enhanced by the ability to tailor properties such as size, volume fraction, and unit cell geometry. This research investigates the response of sandwich panels to low-velocity impacts, focusing on two distinct core designs: rhombic and I-shaped unit cells, each with a core volume fraction of 15%. It also examines how the impact behaviour is influenced by varying the number of unit cells. The study employs finite element analysis using ABAQUS software to determine the energy absorption capacity and plastic strain in these panels. Findings reveal that changes in the unit cell configuration and number of unit cells significantly alter the panels' energy absorption characteristics. This approach of using numerical simulations offers a cost-effective alternative to extensive experimental testing, enabling the evaluation of various topologies and structures. © 2023 Computers and Industrial engineering. All rights reserved.

关键词： Finite element method

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High resolution and high sensitivity imaging magnetometer with magnetic nanoparticle and optical heterodyne detection

High resolution and high sensitivity imaging magnetometer wi...

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2024 Laser science, LS 2024

作者： Bartos, Jan Ba Tis, Taleb Park, Wounjhang Huang, Shu-Wei Department of Electrical Computer and Energy Engineering University of Colorado Boulder80309 United States Material Science and Engineering Program University of Colorado Boulder80309 United States

We present progress towards an imaging magnetometer using a magneto-optical polymer nanocomposite thin film, experimentally demonstrating 29nT/√Hz sensitivity with © 2024 The Author(s). © Optica Publishing ... 详细信息

关键词： Heterodyne detection

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Microstructure of 2D/2D Nanosheets Interface for Improved ORR Electrochemical Kinetics

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1352-1353页

作者： Iqbal, Anum Hamdan, Nasser M. Material Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Physics Department American University of Sharjah Sharjah United Arab Emirates

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Heteroepitaxial growth of ZnO nanosheet bands on ZnCo204 submicron rods toward high-performance Li ion battery electrodes

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Nano Research 2013年第5期6卷 348-355页

作者： Chan Woo Lee Seung-Deok Seo Dong Wook Kim Sangbaek Park Kyoungsuk Jin Dong-Wan Kim Kug Sun Hong DepartmentofMatefials Science andEngineering Seoul National University Seou1151-744 Korea WCU Hybrid Materials Program Department of Materials Science and Engineering Seoul National University Seou1151-744 Korea Department of Material Science and Engineering Ajou University Suwon 443-749 Korea Department of Chemistry Northwestern University 245 Sheridan Road Evanston IL 60208 USA

We report the direct synthesis of ZnC0204 and ZnO/ZnC0204 submicron rod arrays grown on Ni foil current collectors via an ammonia-evaporation-induced method by controlling the ratio of Zn to Co. These three-dimensional （3D） hierar- chical self-supported nanostructures are composed of one-dimensional （1D） ZnCo204 rods and two-dimensional （2D） ZnO nanosheet bands perpendicular to the axis of the each ZnCo204 rod. We carefully deal with the heteroepitaxial growth mechanisms of hexagonal ZnO nanosheets from a crystallographic point of view. Furthermore, we demonstrate the ability of these high-surface-area ZnO/ZnCo204 heterostructured rods to enable improved electrolyte permeability and Li ion transfer, thereby enhancing their Li storage capability （-900 mA.h.g-1 at a rate of 45 mA.h.g-1） for Li ion battery electrodes.

关键词： ZnCo204 submicron rods ZnO nanosheets hierarchicalheterostructure ammonia-evaporation-induced method Li ion battery

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Thermal energy dependent transient permittivity of epsilon-near-zero material

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science China(Physics,Mechanics & Astronomy) 2022年第8期65卷 96-101页

作者： Heng Wang Lixun Sun Kang Du Wending Zhang SooJin Chua Guixin Li Ting Mei MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an710129China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen518055China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen518055China Department of Electrical and Computer Engineering National University of SingaporeSingapore117583Singapore LEES Program Singapore-MIT Alliance for Research&Technology(SMART)Singapore138602Singapore

Transparent conductive oxides exhibit attractive optical nonlinearity with ultrafast response and giant refractive index change near the epsilon-near-zero(ENZ) wavelength, originating from the intraband dynamics of conduction electrons. The optical nonlinearity of ENZ materials has been explained by using the overall-effective-mass and the overall-scattering-time of electrons in the extended Drude model. However, their response to optical excitation is yet the last building block to complete the theory. In this paper, the concept of thermal energy is theoretically proposed to account for the total energy of conduction electrons exceeding their thermal equilibrium value. The time-varying thermal energy is adopted to describe the transient optical response of indium-tin-oxide(ITO), a typical ENZ material. A spectrally-resolved femtosecond pump-probe experiment was conducted to verify our theory. By correlating the thermal energy with the pumping density, both the giant change and the transient response of the permittivity of ITO can be predicted. The results in this work provide a new methodology to describe the transient permittivities of ENZ materials, which will benefit the design of ENZ-based nonlinear photonic devices.

关键词： epsilon-near-zero optical nonlinearity transient response thermal energy hot electron indium tin oxide

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Characterization of indigo-doped poly(3-hexylthiophene):-phenyl C61-butyric acid methyl ester bulk heterojunction solar cells

Characterization of indigo-doped poly(3-hexylthiophene):-phe...

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作者： Lu, Yang-Ming Wong, Jing-Syun Hsu, Lien-Chung Master Program of Electro-Optical Engineering Department of Electrical Engineering National University of Tainan Tainan Taiwan Graduate Institute of Material Science and Engineering National Cheng Kung University Tainan Taiwan

Poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acid methyl ester bulk hetero-junction photovoltaic cells doped with indigo dye as a p-type solar collector were studied. Doping indigo increases the absorption of the visible light spectrum, as determined using ultraviolet-visible spectrophotometry analysis. The photocurrent was measured in air under a solar simulator with AM 1.5G illumination (100 mW/cm2). The best photovoltaic efficiency obtained was 2.55% after doping indigo into the cell. © 2012 Elsevier B.V.

关键词： Organic solar cells

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Evaluating mechanism of banana pseudo-stem retting using seawater:A cost-effective surface pre-treatment approach

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Journal of Bioresources and Bioproducts 2024年第3期9卷 322-335页

作者： Prince Hotor Ahmed H.Hassanin Osbert Akatwijuka Mohamed A.H.Gepreel Mitsuo Yamamoto Yukie Saito Ahmed Abdel-Mawgood Egypt-Japan University of Science and Technology Biotechnology ProgramAlexandria GovernorateNew Borg Al Arab 21934Egypt Alexandria University Department of Textile EngineeringAlexandria GovernorateBab Sharqi 5424041Egypt Egypt-Japan University of Science and Technology Material Science and EngineeringAlexandria GovernorateNew Borg Al Arab 21934Egypt Graduate School of Agricultural and Life Sciences The University of TokyoBunkyo-KuTokyo 113-8657Japan

Retting has been employed to extract natural fibers from agricultural wastes as a biological and cost-effective approach for *** its global abundance,banana pseudo-stem is a promising agro-waste for lignocellulosic fiber *** this study,fibers were extracted from the pseudo-stems after being pre-treated under four conditions using seawater at room temperature for up to 35 d Bacterial isolation from the fresh seawater sample and screening for ligninolytic ability were *** load as well as laccase and manganese peroxidase enzyme activity profile assay during the retting duration were *** transform infrared(FT-IR)and X-day diffraction(XRD)analyses were also examined for both pre-treated and untreated extracted *** results shows that six out of the eight bacterial isolates had the ability to degrade *** treatments(Raw stem+Raw seawater)and(Autoclaved stem+Raw seawater)recorded the highest viable bacterial load of 9.24×102 and 4.46×102 CFU,respectively,on the 14th day of the retting ***,the highest laccase and manganese peroxidase enzymes activity was recorded for(Raw stem+Raw seawater)and(Autoclaved stem+Raw seawater)treatments in the second to the third *** FT-IR spectra of the pre-treated fibers revealed relative reductions in peaks attributed to polysaccharides and other amorphous substances for all retting *** XRD diffractogram revealed that the crystallinity index(CI)of pre-treated fibers increased in all seawater retting treatment ***,the CI for fibers pre-treated under enzymatic conditions were enhanced even after five *** analysis for selected bacterial isolates showed homology to sequences of Bacillus velezensis,Shewanella sp.L8–5,and Citrobacter amalonaticus and Bacillus subtilis j8 *** these findings,it was suggested that physical,biological,and chemical actions were collectively involved in the seawater retting process of banana ps

关键词： Seawater retting Banana pseudo-stem Natural fiber Enzyme activity Colony forming unit

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Change of Electrical and Transport Properties of Nickel Oxide by Carrier Concentration and Temperature through First‑Principle Calculations

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Nanomanufacturing and Metrology 2023年第4期6卷 109-118页

作者： Nayem Md.Reza Shah Chang‑Dong Yeo Minyeong Choi Yang‑Ki Hong Jeong H.You Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79409USA Department of Electrical and Computer Engineering and Material Science Ph.D.Program The University of AlabamaTuscaloosaAL 35487USA Department of Mechanical Engineering School of EngineeringUniversity of St.ThomasSt.PaulMN 55105USA

Nickel is typically used as one of the main components in electrical contact devices or *** oxide(NiO)is usually formed on the surfaces of electrodes and can negatively impact system performance by introducing electrical contact *** thermal,electrical,and transport properties of NiO,as a Mott insulator or a p-type semiconductor,can be altered by operating and environmental conditions such as temperature and stress/strain by *** this study,we inves-tigate the fundamental material properties of NiO through the first-principle ***,we obtain and compare the lattice parameter,magnetic moment,and electronic structure for NiO via the WIEN2K simulations with four different poten-tials(i.e.,GGA,GGA+U,LSDA,and LSDA+U).Then,using the WIEN2K simulation results with LSDA+U potential that produces a highly accurate bandgap for NiO,we calculate the electrical conductivity and electrical part of the thermal conductivity of nickel and NiO as a function of temperature and carrier concentration through the BoltzTraP *** simulation results revealed that the electrical conductivity relative to the relaxation time for NiO increases with the carrier concentration,while it shows a slightly decreasing trend with temperature under a fixed carrier *** contrast,the electrical part of the thermal conductivity shows an increasing trend considering carrier concentration and temperature.

关键词： Nickel oxide Magnetic moments Density of states Seebeck coefcient Electrical conductivity

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