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SPE Polymers 2024年第4期5卷 557-567页

作者： Akter, Nasrin Repon, Md. Reazuddin Pranta, Arnob Dhar Islam, Shaima Khan, Azmat Ali Malik, Abdul Department of Textile Engineering Ahsanullah University of Science and Technology Dhaka Bangladesh Department of Textile Engineering Daffodil International University Dhaka Bangladesh Department of Bioproducts and Biosystems School of Chemical Engineering Aalto University Espoo Finland Department of Production Engineering Faculty of Mechanical Engineering and Design Kaunas University of Technology Kaunas Lithuania ZR Research Institute for Advanced Materials Sherpur Bangladesh Department of Textile Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh Pharmaceutical Biotechnology Laboratory Department of Pharmaceutical Chemistry College of Pharmacy King Saud University Riyadh Saudi Arabia

Cotton is the most widely used natural cellulosic polymer and polyester is a synthetic polymer. The use of polyester fiber is increasing gradually day by day due to its strength and longevity, while the use of cotton fiber is decreasing due to its unavailability. At present, the use of cotton-polyester composites is ubiquitous. This research work aims to assess the physical, mechanical and comfort properties of the woven fabric using cotton-polyester composite yarns in a weft direction and coarser yarn count because of the use of these fabrics in the future for the denim manufacturing process. Four different samples were fabricated by using 100% cotton (10 Ne) yarn in the warp direction and 100% cotton, cotton-polyester composite, and 100% polyester yarn in the weft direction of the fabric. Similar fabric and machine parameters were maintained for manufacturing all the samples. The samples were then tested for areal density, tensile strength, thickness, abrasion resistance and pilling, drape, flexural rigidity, and air permeability to find the optimum capability of the fabric. Physico-mechanical properties with the proportion of increasing polyester components in fabrics improves areal density (184 to 199 g/m²), strength (almost 19 times in weft direction), drape (0.655% to 0.789%), and flexural rigidity (almost double). On the other hand, increasing comfortability properties with the proportion of cotton components in fabrics improve air permeability (139.85 to 159.58 cc/s/cm²), abrasion (only 3.036% mass loss), and pilling resistance (grading 4 after 2000 cycles). Highlights: Composite yarns made of cotton and polyester provide a method of improving fabric properties for better performance. Higher proportions of cotton make clothes more breathable and less likely to pill and wear out. Polyester parts make fabrics stronger, more durable, and less likely to wear out. Cotton-polyester composites are ideal and have potential for various textile a

关键词： abrasion resistance air permeability flexural rigidity tensile strength

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Electron-phonon coupling and thermal conductivity of MAB compounds

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Physical Review materials 2024年第5期8卷 055002-055002页

作者： Tuğbey Kocabaş Bipasa Samanta Elisangela da Silva Barboza Cem Sevik Milorad V. Milošević Deniz Çakır Department of Materials Science and Engineering Institute of Graduate Programs Department of Physics and Astrophysics Instituto de Física Department of Physics & NANOlab Center of Excellence Department of Mechanical Engineering Faculty of Engineering

We investigated the electron-phonon (e-ph) coupling and vibrational thermal conductivity in the representative MAB compounds, namely MoAlB, WAlB, Tc2AlB2, and Cr2AlB2. The spectral distribution functions of e-ph interaction, obtained through ab initio linear-response calculations, reveal that the electron-phonon coupling values range from low (0.15) to moderate (0.58). With such e-ph coupling, out of the considered compounds, only Tc2AlB2 exhibits a superconducting transition, at 4 K. We further evaluated the thermal conductivity and associated properties like scattering rates, obtained using ab initio and other methodologies. The latter included the iterative solution of the Peierls-Boltzmann transport equation, using hiphive package for advanced optimization and machine learning techniques, and employing maximum likelihood estimation to approximate scattering rates from a limited set of scattering processes. We found that these methods yield nearly identical predictions for thermal conductivity values, with a significant decrease in the computational cost compared to the first-principles methods. We examined interactions arising from both three-phonon (3ph) and four-phonon (4ph) scattering processes. The 4ph interactions demonstrated a smaller yet significant impact on the overall vibrational thermal conductivity, most notably in Tc2AlB2. Our findings indicate that Cr2AlB2 has the highest thermal conductivity across all considered crystal directions, with the thermal conductivity being spatially anisotropic, most pronouncedly in Tc2AlB2. Finally, we show that empirical expressions based on Slack models are well suited for screening the thermal conductivity properties of MAB phases, and can be employed to establish upper and lower limits of their thermal conductivity.

关键词： Thermal conductivity MAX phase compounds Boltzmann theory First-principles calculations

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Determination of Fiber Volume Fraction of Carbon Fiber-reinforced Thermoplastic Polymer Using Thermogravimetric Methods

Determination of Fiber Volume Fraction of Carbon Fiber-reinf...

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Fiber Society 2022 Fall Meeting and Technical Conference: 80 Years of Excellence in Advancing Scientific Knowledge Pertaining to Fibers and Fiber materials

作者： Asfew, Kasahun Niguse Ivens, Jan Moens, David Department of Materials Engineering KU Leuven Leuven Belgium Department of Mechanical Engineering KU Leuven Leuven Belgium Department of Mechanical Engineering Adama Science and Technology University Adama Ethiopia

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Identification of the Aeromechanical Parameters of a Compressor Rotor from Blade Tip Timing Data

Identification of the Aeromechanical Parameters of a Compres...

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作者： Hall, Kenneth C. Hall, Steven R. Department of Mechanical Engineering and Materials Science Duke University DurhamNC 27708 United States Department of Aeronautics and Astronautics Massachusetts Institute of Technology CambridgeMA02139 United States

This article presents a maximum likelihood approach to identifying the mistuning, aerodynamic forcing functions, and aerodynamic influence coefficients of compressor rotor blades from noisy experimental measurements of blade deflection. The maximum likelihood estimation approach leads naturally to a nonlinear least squares optimization problem that can be solved using numerical optimization techniques such as quasi-Newton methods. An eigenmode decomposition approach is presented that permits the optimization objective function and gradient to be efficiently calculated so that the optimization is computationally feasible, even for experiments involving very large data sets. Simulation results show that the method has the potential to accurately identify the mistuning and aerodynamic nodal diameter forcing functions, but obtaining accurate results for influence coefficients may not be possible if there is significant disk flexibility. We demonstrate the method using both simulated and experimental blade vibration data from rotor 2 of the Purdue University three-stage axial compressor research facility collected using a light probe tip timing system as the rotor is slowly accelerated or decelerated through a Campbell diagram crossing. © 2024 American Society of mechanical Engineers (ASME). All rights reserved.

关键词： Aerodynamics

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Coaxial boron nitride nanotubes as interfacial dielectric layers to lower interface trap density in carbon nanotube transistors

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Nano Research 2023年第11期16卷 12840-12848页

作者： Keigo Otsuka Taiki Sugihara Taiki Inoue Weijie Jia Satoru Matsushita Takanobu Saito Minhyeok Lee Takashi Taniguchi Kenji Watanabe Gregory Pitner Ming-Yang Li Tzu-Ang Chao Rong Xiang Shohei Chiashi Shigeo Maruyama Department of Mechanical Engineering The University of TokyoTokyo 113-8656Japan Department of Applied Physics Osaka UniversityOsaka 565-0871Japan Research Center for Materials Nanoarchitectonics National Institute for Materials ScienceTsukuba 305-0044Japan Research Center for Electronic and Optical Materials National Institute for Materials ScienceTsukuba 305-0044Japan Corporate Research Taiwan Semiconductor Manufacturing CompanySan JoseCA 95134USA Corporate Research Taiwan Semiconductor Manufacturing CompanyHsinchu 30078

A semiconductor/dielectric interface is one of the dominant factors in device characteristics,and a variety of oxides with high dielectric constants and low interface trap densities have been used in carbon nanotube *** the crystal structure of nanotubes with no dangling bonds,there remains room to investigate unconventional dielectric ***,we fabricate carbon nanotube transistors with boron nitride nanotubes as interfacial layers between channels and gate dielectrics,where a single semiconducting nanotube is used to focus on switching behaviors at the subthreshold *** subthreshold swing of 68 mV·dec^(−1)is obtained despite a 100-nm-thick Sio_(2)dielectric,corresponding to the effective interface trap density of 5.2×10^(11)cm^(−2)·eV^(−1),one order of magnitude lower than those of carbon nanotube devices without boron nitride *** interfacial layers also result in the mild suppression of threshold voltage variation and *** achieve Ohmic contacts through the selective etching of boron nitride nanotubes with XeF2 gas,overcoming the trade-off imposed by wrapping the inner *** impacts of fluorinating carbon nanotubes on device performances are also confirmed as long as the etching is applied exclusively at source/drain *** results represent an important step toward nanoelectronics that exploit the advantage of one-dimensional van der Waals heterostructures.

关键词： carbon nanotubes hexagonal boron nitride van der Waals interfaces field-effect transistors subthreshold swing selective etching

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Extremely large water droplet impact onto a deep liquid pool

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Physical Review E 2024年第4期109卷 045107-045107页

作者： Sandip Dighe Dilip Kumar Maity Jeffrey N. Fonnesbeck Som Dutta Tadd Truscott Mechanical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal 23955 Kingdom of Saudi Arabia Department of Mechanical Engineering Utah State University Logan Utah 84322 USA

Most studies of droplet impact on liquid pools focus on droplet diameters up to the capillary length (0.27 cm). We break from convention and study extremely large water droplets (1 to 6 cm diameter) falling into a pool of water. We demonstrate that the depth and width of the cavity formed by large droplet impact is greatly influenced by the deformed shape of the droplet at impact (i.e., prolate, spherical, and oblate), and larger droplets amplify this behavior by flattening before impact. In particular, the maximum cavity depth is a function of the Froude number and axis ratio of the droplet just before impact. Further, the cavity depth is more dependent on the droplet height than width, and the maximum cavity diameter is independent of the droplet height. In general, we observe that more oblate droplets result in decreasing cavity depths for a fixed liquid volume. This is because an increase in horizontal droplet diameter results in a reduced impact energy flux and therefore reduced cavity depth.

关键词： Capillary interactions Drop breakup Drops & bubbles Thin fluid films Wakes & jets Water

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Dynamic deformation behavior of a FeCrNi medium entropy alloy

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Journal of materials science & Technology 2022年第5期100卷 120-128页

作者： Ao Fu Bin Liu Zezhou Li Bingfeng Wang Yuankui Cao Yong Liu State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Department of Mechanical and Aerospace Engineering University of CaliforniaSan DiegoUnited States School of Materials Science and Engineering Central South UniversityChangsha 410083China

Deformation behavior of a FeCrNi medium entropy alloy(MEA)prepared by powder metallurgy(P/M)method was investigated over a wide range of strain *** FeCrNi MEA exhibits high strain-hardening ability,which can be attributed to the multiple deformation mechanisms,including dislocation slip,deformation induced stacking fault and mechanical *** shear localization behavior of the FeCrNi MEA was also analyzed by dynamically loading hat-shaped specimens,and the distinct adiabatic shear band cannot be observed until the shear strain reaches~*** microstructures within and outside the shear band exhibit different characteristics:the grains near the shear band are severely elongated and significantly refined by dislocation slip and twinning;inside the shear band,the initial coarse grains completely disappear,and transform into recrystallized ultrafine equiaxed grains by the classical rotational dynamic recrystallization ***,microvoids preferentially nucleate in the central areas of the shear band where the temperature is very high and the shear stress is highly *** microvoids will coalesce into microcracks with the increase of strain,which eventually leads to the fracture of the shear band.

关键词： Medium entropy alloys mechanical response Dynamic shear properties Grain refinement Adiabatic shear band

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Taguchi-Optimized Friction Stir Welding of Aluminum Alloy AA2219: Investigating the Influence of Process Parameters on mechanical Properties Via Grain Refinement

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Multiscale science and engineering 2024年第3期5卷 166-179页

作者： Ahmad, Shahid Khan, Asif Mehmood, Asim Mehmood, Kashif Kousar, Humaira Ahmad, Salman Adnan, Muhammad Sattar, Abdul Ali, Sarim Department of Mechanical Engineering HITEC University Taxila Punjab Pakistan Department of Computer Science Friedrich-Alexander-Universität Erlangen-Nürnberg Nuremberg Germany School of Chemical and Materials Engineering (SCME) National University of Science and Technology Islamabad Pakistan Department of Materials Science and Engineering Institute of Space Technology (IST) Islamabad Pakistan Department of Mechanical Engineering University of Engineering and Technology Taxila Pakistan Department of Metallurgy and Materials Engineering University of Engineering and Technology Taxila Punjab Pakistan

mechanical properties of fusion welded joints can be improved by refinement of grain size. This study presents the effect of the friction stir welding process on grain refinements (grain size and grain morphology) of aluminum alloy AA2219-To butt welded joints of gas tungsten arc welding (GTAW). Traditional cold working and heat treatment processes are compared and contrasted with a novel hybrid welding approach, which incorporates the use of Friction Stir Welding (FSW) in unification with the TIG welding. Our analysis encompasses to evaluating the impact of FSW process parameters on grain refinement (grain size and morphology), particularly rotational speed (RPM), traverse speed (feed), and tool pin geometry. Employing the multi-objective Taguchi method, these FSW parameters were optimized to yield superior mechanical properties and quality features. Our results highlight that the introduction of FSW as an adjunct to traditional GTAW, a process referred to as ‘Hybrid Welding’ in this study, can achieve notable grain refinement in the Aluminum alloy welded joints.

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Exceptional thermal stability of ultrafine-grained long-period stacking ordered Mg alloy

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Rare Metals 2022年第5期41卷 1537-1542页

作者： Shuai-Jun Ding Li-Dong Xu Xue-Cheng Cai Shen-Xiang-Yu Gu Kang-Kang Wen Hui Yu Zheng Chen Bao-Ru Sun Sheng-Wei Xin Tong-De Shen State Key Laboratory of Metastable Materials Science and Technology Clean Nano Energy CenterYanshan UniversityQinhuangdao 066004China Department of Mechanical Engineering the University of Hong KongHong Kong 999077China School of Material Science and Engineering China University of Mining and TechnologyXuzhou 221116China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132China

The hierarchical long-period stacking ordered(LPSO)architecture composed mainly of an ultrafine-grained LPSO matrix has been demonstrated to be a feasible design strategy for achieving ultra-strong Mg ***,we report an... 详细信息

关键词： grain alloy alloy

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Fully rubbery synaptic transistors made out of all-organic materials for elastic neurological electronic skin

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Nano Research 2022年第2期15卷 758-764页

作者： Hyunseok Shim Seonmin Jang Jae Gyu Jang Zhoulyu Rao Jong-ln Hong Kyoseung Sim Cunjiang Yu Materials Science and Engineering Program University of HoustonHoustonTX 77204 USA Department of Chemistry Seoul National UniversitySeoul 08826Republic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Mechanical Engineering University of HoustonHoustonTX 77204 USA Department of Biomedical Engineering University of HoustonHoustonTX 77204USA Department of Electrical and Computer Engineering University of HoustonHoustonTX 77204 USA Texas Center for Superconductivity University of HoustonHoustonTX 77204USA

Neurologic function implemented soft organic electronic skin holds promise for wide range of applications,such as skin prosthetics,neurorobot,bioelectronics,human-robotic interaction(HRI),***,we report the development of a fully rubbery synaptic transistor which consists of all-organic materials,which shows unique synaptic characteristics existing in biological *** synaptic characteristics retained even under mechanical stretch by 30%.We further developed a neurological electronic skin in a fully rubbery format based on two mechanoreceptors(for synaptic potentiation or depression)of pressure-sensitive rubber and an all-organic synaptic *** converting tactile signals into Morse Code,potentiation and depression of excitatory postsynaptic current(EPSC)signals allow the neurological electronic skin on a human forearm to communicate with a robotic *** collective studies on the materials,devices,and their characteristics revealed the fundamental aspects and applicability of the all-organic synaptic transistor and the neurological electronic skin.

关键词： synaptic transistor stretchable electronic skin all-organic

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