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Distance Learning at the MS and PhD Levels in the Nuclear and Radiation engineering program, Nuclear and Applied robotics, Materials Science and engineering and Walker department of mechanical engineering at the University of Texas at Austin

Distance Learning at the MS and PhD Levels in the Nuclear an...

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2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Landsberger1, Sheldon Charlton, William Clamo, Kevin Ezekoye, Ofodike Kovar, Desiderio Haas, Derek Pryor, Mitchell University of Texas at Austin Nuclear and Radiation Engineering Program Nuclear Engineering Teaching Lab 10100 Burnet Road Pickle Research Campus R-9000 AustinTX United States Walker Department of Mechanical Engineering University of Texas at Austin 204.Dean Keeton ETC II 5.160 AustinTX United States The University of Texas at Austin Materials Science and Engineering Walker Department of Mechanical Engineering 204 Dean Keeton ETC II 5.100 AustinTX United States

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Sedimentation-driven one-step fabrication of bifunctional single-layered triboelectric nanogenerator from sol-state composite precursor

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Friction 2025年第2期13卷 49-56页

作者： Yoonsang Ra Dongik Kam Sunmin Jang Sumin Cho Donghan Lee Dongwhi Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityGyeonggi 17104Republic of Korea

Although the triboelectric nanogenerator(TENG)has been highlighted as a promising mechanical energy harvester,the requirement of stacking the two individual layers,contact and conductive layers,has been ball and chain around the ankle of unleashing potential and an advantage of TENGs in their application expansion and ***,one-step fabrication of a single-layered bifunctional composite film-based TENG(BFTENG)driven by the sedimentation of a sol-state precursor is proposed for the extremely facile conversion of various ordinary items into energy *** BF-TENG consists of the polydimethylsiloxane(PDMS)matrix and a carbon nanopowder filler,and it includes both the dielectric part(DP)and conductive part(CP)in one single *** electrical percolation threshold of the incorporated concentration of carbon,ICC,for CP to act as a passage through which induced charges move in BF-TENGs is determined to be 1.0 wt%.The degree of carbon sedimentation in developing the proposed composite can be controlled by the curing speed and the probability of a crosslinking *** maximum peak power is approximately 0.093μW when the contact surface area is 78.5 mm2;the contact frequency is 8 Hz,and the connected load resistance is 9 MΩ.Based on these results,the electrical performance of BF-TENGs in response to various physical stimuli is characterized considering the mechanical energy sources available in daily ***,converting ordinary surfaces such as desks and human skin into BF-TENGs through a single coating procedure and harvesting energy to power an electric device are demonstrated as a proof-of-concept.

关键词： triboelectric nanogenerator one-step fabrication sedimentation bifunctional composite film

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Adaptive Discrete-Time Sliding Mode Control Applied to the Pitch Motion of a Micro Air Vehicle with Flapping Wings

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Journal of Bionic engineering 2025年第2期22卷 585-595页

作者： Joshua Hill Farbod Fahimi Chang-kwon Kang Hikaru Aono Department of Mechanical&Aerospace Engineering University of Alabama in HuntsvilleHuntsvilleAL35899USA Department of Mechanical Engineering and Robotics Shinshu University3-15-1 Tokida3868567UedaNaganoJapan

A robust Adaptive Discrete-time Sliding Mode Controller (ADSMC) is formulated, and is applied to control the pitch motion of a simulated Flapping-Wing Micro Air Vehicle (FWMAV). There is great potential for FWMAVs to be used as aerial tools to assist with gathering data and surveying environments. Thanks to modern manufacturing and technology, along with an increased comprehension behind the aerodynamics of wing flaps, these vehicles are now a reality, though not without limitations. Given their diminutive size, FWMAVs are susceptible to real-world disturbances, such as wind gusts, and are sensitive to particular variations in their build quality. While external forces such as wind gusts can be reasonably bounded, the unknown variations in the state may be difficult to characterize or bound without affecting performance. To address these problems, an ADSMC is developed. First, the FWMAV model is converted from continuous-time to discrete-time. Second, an ADSMC for the newly discretized FWMAV model is developed. Using this controller, the trajectory tracking performance of the FWMAV is assessed against a traditional discrete sliding mode controller, and is found to have a decreased chattering frequency and decreased control effort for the same task. Therefore, the ADSMC is assessed as the superior controller, despite being completely unaware of the model parameters or wind gust.

关键词： Discrete-time sliding-mode control Adaptive sliding-mode control Flapping-wing micro air vehicles Wind gust

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Concurrent generation and amplification of longitudinal and bending waves using defective phononic crystals

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Applied Mathematics and Mechanics(English Edition) 2025年第2期46卷 269-288页

作者： S.H.JO Department of Mechanical Roboticsand Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

Defective phononic crystals(PnCs)have enabled spatial localization and quantitative amplification of elastic wave *** previous research has focused on applications such as narrow-bandpass filters,ultrasonic sensors,and piezoelectric energy harvesters,typically operating under the assumption of an external elastic wave ***,a novel approach that uses defective PnCs as ultrasonic actuators to generate amplified waves has ***,the existing studies are limited to the generation of either longitudinal or bending waves,with no research addressing the concurrent generation of ***,this paper proposes a straightforward methodology for the concurrent generation and amplification of both wave types utilizing defect modes at independent defect-band *** piezoelectric elements are attached to the defect,with each element connected to independent external voltage *** precisely adjusting the magnitude and temporal phase differences between the voltage sources,concurrently amplified wave generation is *** paper highlights the advantages of the proposed analytical *** model is both computationally time-efficient and accurate,in comparison with the COMSOL simulation *** instance,in case studies,the analytical model reduces the computational time from one hour to mere seconds,while maintaining acceptable error rates of 1%in peak *** concurrent wave-generation methodology opens new avenues for applications in rotating machinery fault diagnosis,structural health monitoring,and medical imaging.

关键词： phononic crystal(PnC) defect concurrent generation piezoelectric ultrasonic actuator

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Evaluation of Windshield Impact on Embedded LiDAR Systems in Autonomous Vehicles

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Transactions of the Korean Society of mechanical Engineers, A 2025年第5期49卷 371-381页

作者： Park, Kyutae Ki, Daeyeon Choi, Haram Song, Jinwoo Kim, Heung Soo Department of Mechanical Robotics and Energy Engineering Dongguk Univ. Korea Republic of

In this study, the effect of the vehicle windshield on the light detection and ranging (LiDAR) sensor signal was analyzed in constructing an embedded LiDAR system for an autonomous vehicle. Ten different types of tinted films were attached to the windshield to simulate the vehicle environment, and changes in the LiDAR signal transmission were observed. One-dimensional (1D) LiDAR sensors and Lambertian targets were used to derive data that passed through the windshield and reflected from the target. The changes in signal strength and distance measurements of the LiDAR sensor were quantitatively evaluated and analyzed. In experiments, the signal strength of the LiDAR sensor decreased and was scattered when transmitted through the windshield and some tinting films, leading to an increase in the uncertainty of the distance measurement accuracy. The experimental model proposed in this paper is expected to provide a basis for evaluating the effects of windshields and tinting films on LiDAR sensor signals in advance when designing an embedded LiDAR system for autonomous vehicles. © 2025 The Korean Society of mechanical Engineers.

关键词： Distance measurement

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Ankle Exoskeleton Control via Data-Driven Gait Estimation for Walking, Running, and Inclines

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IEEE robotics and Automation Letters 2025年第6期10卷 5855-5862页

作者： Shetty, Pavan R. Menezes, Jayston A. Song, Seungmoon Young, Aaron J. Shepherd, Max K. Northeastern University Department of Mechanical Engineering BostonMA02115 United States Northeastern University Department of Mechanical Engineering Institute for Experiential Robotics BostonMA02115 United States Georgia Institute of Technology Woodruff School of Mechanical Engineering Institute for Robotics and Intelligent Machines AtlantaGA30332-0405 United States Northeastern University Department of Mechanical Engineering Institute for Experiential Robotics Department of Physical Therapy Movement and Rehabilitation Science BostonMA02115 United States

Ankle exoskeletons have the potential to augment mobility, but control strategies have largely failed to seamlessly adapt to changes in the locomotion task. Here, we introduce a multi-headed network that predicts gait speed, ground incline, stance/swing transitions, and percent stance. These predictions are mapped to exoskeleton torque using typical biological torques as a guide. The model was trained on 9 subjects walking/jogging for 12 minutes across a range of speeds and inclines. The controller was validated on 4 subjects, and achieved stance phase prediction error of 3.4% across a range of speeds and inclines, both inside and outside the training set distribution. A secondary analysis showed similar accuracy could have been obtained with only 10% of the collected data, suggesting researchers may need fewer total strides of training data, provided the data is sufficiently diverse across users and tasks. Metabolic cost was improved during running compared to wearing the exoskeleton powered off, but was beneficial for only one subject during level walking and ramp ascent when compared to no exoskeleton. Overall, our controller smoothly adapted to time-varying inclines and walking/jogging speeds, and achieved high accuracy with a reduced training dataset, though larger torque magnitudes may be required to see metabolic benefit. © 2016 IEEE.

关键词： Exoskeleton (robotics)

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Studying the Impact of T4 and T6 Heat Treatments on Corrosion and mechanical Properties of 6082-Al Alloy Treated with Al-5Ti-1B Grain Refiner

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Journal of Bio- and Tribo-Corrosion 2025年第1期11卷 1-13页

作者： Abd El-Aziz, Kh. Saber, D. Materials Engineering Department Faculty of Engineering Zagazig University Zagazig44519 Egypt Mechanical Engineering Department College of Engineering Taif University Taif Saudi Arabia Industrial Engineering Program Mechanical Engineering Department College of Engineering Taif University Taif Saudi Arabia

The mechanical and corrosion characteristics of aluminum alloys can be influenced not only by the addition of grain refiners but also by heat treatment that modifies the microstructure and introduces variations in these characteristics. The purpose of this work was to examine how the mechanical properties and corrosion resistance of 6082-Al alloy with Al-5Ti-1B grain refiner are affected by both artificial and natural aging heat treatments. By using the permanent mold casting process, the required specimens of the investigated alloys were produced. A VHS-1000 microhardness testing apparatus is used to measure microhardness at a 100 g load. A sliding wear test is carried out using a pin-on-disk apparatus. Potentiodynamic polarization curves in a 3.5 weight percent NaCl solution are used to assess the corrosion behavior of every specimen. The current results revealed that the mechanical properties improved markedly with the additions of Al–5Ti-1B grain refiner to the investigated alloy, this is maybe due to the microstructure changes as a result of grain refiner additions. Although the addition of Al-5Ti-1B grain refiner to 6082-Al alloy improved the hardness and wear resistance, it showed a negative influence on the corrosion resistance of these alloys. The results also demonstrated that, when compared to as-cast condition, artificial heat treatment of 6082-Al alloy inoculated by Al-5Ti-1B grain refiner improved their hardness, wear resistance, and corrosion properties significantly. Furthermore, compared to natural aging heat treatment, artificial aging heat treatment demonstrated a noticeably improved level of hardness, wear, and corrosion behavior. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Aluminum corrosion

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Quenched PVDF/PMMA Porous Matrix for Triboelectric Energy Harvesting and Sensing

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Energy & Environmental Materials 2025年第1期8卷 229-238页

作者： Assem Mubarak Bayandy Sarsembayev Yerzhigit Serik Abdirakhman Onabek Zhanat Kappassov Zhumabay Bakenov Kazuyoshi Tsuchiya Gulnur Kalimuldina Department of Mechanical and Aerospace Engineering School of Engineering and Digital Sciences Nazarbayev University Institute of Smart Systems and Artificial Intelligence Nazarbayev University Department of Robotics Engineering School of Engineering and Digital Sciences Nazarbayev University Department of Chemical and Materials Engineering School of Engineering and Digital Sciences Nazarbayev University Micro/Nano Technology Center Tokai University

The rapid development of nanotechnology has significantly revolutionized wearable electronics and expanded their *** introducing innovative solutions for energy harvesting and autonomous sensing,this research presents a cost-effective strategy to enhance the performance of triboelectric nanogenerators(TENGs).The TENG was fabricated from polyvinylidene fluoride(PVDF) and N,N'-poly(methyl methacrylate)(PMMA) blend with a porous structure via a novel optimized quenching method.

关键词： N,N′-poly(methyl methacrylate) (PMMA) robotic tactile sensors polyvinylidene fluoride (PVDF) quenching triboelectric nanogenerators (TENGs)

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Continuous sign language recognition using intra-inter gloss attention

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Multimedia Tools and Applications 2025年 1-19页

作者： Ranjbar, Hossein Taheri, Alireza Social and Cognitive Robotics Lab. Mechanical Engineering Department Sharif University of Technology Tehran Iran

Many continuous sign language recognition (CSLR) studies adopt transformer-based architectures for sequence modeling due to their powerful capacity for capturing global contexts. Nevertheless, vanilla self-attention, which serves as the core module of the transformer, performs context-aware weighted aggregation over all time steps. Therefore, the local temporal semantics of sign videos may not be fully exploited. This study introduces a novel module for sign language recognition, the intra-inter gloss attention module, designed to leverage relationships among frames within glosses and to capture the semantic and grammatical dependencies between glosses in the video. In the intra-gloss attention module, the video is divided into equally sized chunks, and a self-attention mechanism is applied within each chunk. This localized self-attention significantly reduces complexity and eliminates noise introduced by considering non-relative frames, and achieves a 0.6 improvement in WER based on the baseline model while increasing inference speed by 20%. In the inter-gloss attention module, the chunk-level features within each gloss chunk are initially aggregated by average pooling along the temporal dimension, which leads to a 0.7 improvement in WER. Subsequently, multi-head self-attention is applied to all chunk-level features. Given the non-significance of the signer-environment interaction, we utilize segmentation module to remove the background of the videos. This enables the proposed model to direct its focus toward the signer and achieve an additional 1.5 improvement in WER. Experimental results on the PHOENIX-2014 benchmark dataset demonstrate that our method can effectively extract sign language features in an end-to-end manner without any prior knowledge, improve the accuracy of CSLR, and achieve the word error rate (WER) of 20.4 on the test set which is a competitive result compare to the state-of-the-art which uses additional supervisions. © The Author(s), under exc

关键词： Semantics

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A comparative study on the influence of nanoclay and nanosilica on the mechanical properties of NR/SBR/NBR ternary rubber nanocomposites

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Journal of Polymer Research 2025年第5期32卷 1-22页

作者： Srinivas, J. Jagatheeshwaran, M.S. Vishvanathperumal, S. Elayaperumal, A. Department of Robotics and Automation Karpaga Vinayaga College of Engineering and Technology Chinna Kolambakkam Tamilnadu Maduranthagam Taluk Chengalpet603308 India Department of Mechanical Engineering Easwari Engineering College Bharathi Salai 600089 Ramapuram Chennai India Department of Mechanical Engineering SA Engineering College Tamilnadu Chennai600077 India Department of Mechanical Engineering College of Engineering Anna University Tamilnadu Chennai600025 India

The unfilled rubber blends composed of natural rubber (NR), styrene-butadiene rubber (SBR), and acrylonitrile-butadiene rubber (NBR) exhibited inferior properties due to the lack of a reinforcing agent. However, the incorporation of nanofillers significantly improved the strength of the compound. Two nanofillers, nanoclay (NC) and nanosilica (NS), were added to the NR/SBR/NBR blends, which were prepared using an open milling process with nanofiller contents varying from 0 to 10 phr. The use of fine particle-sized fillers required consideration of potential outcomes related to rubber-filler and filler-filler interactions, as well as the varying polarity and composition of the rubber components, which influenced these interactions. To enhance the compatibility between the non-polar and polar rubber phases, 3 phr of Ultrablend 4000 was used. The rubber compound was cured using conventional sulfur vulcanization. Cure characteristic results showed that NC had minimal effect on curing time. The mechanical properties and swelling resistance of the blends compatibilized with Ultrablend 4000 were evaluated using tensile tests, hardness, rebound resilience, abrasion resistance, and mole percent uptake measurements. NS proved to be more effective than NC in enhancing tensile strength, with optimal stress at 100% elongation and tensile strength occurring at 6 phr of NS. Beyond this point, tensile strength decreased due to NS particle agglomeration, which weakened the nanocomposites. Increasing nanofiller content in the NR/SBR/NBR vulcanizates led to improvements in tear strength, hardness, and abrasion resistance, attributed to better filler dispersion and stronger filler-rubber interactions. Notably, NS had a more significant impact on the mechanical properties and swelling resistance of the nanocomposites compared to NC. The percentage increase in tensile strength, stress at 100% elongation, and tear strength of the NR/SBR/NBR nanocomposites shows increases of 154%, 48%, and

关键词： Tensile strength

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