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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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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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Control of a Two-wheeled Self-balancing Robot With a Sliding Mechanism

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Journal of Institute of Control, robotics and Systems 2025年第1期31卷 37-43页

作者： Kim, David Kim, Hyun Seok Choi, Dongil Department of Mechanical Engineering Myongji University Korea Republic of Smart Robotics Team Hyundai Rotem Korea Republic of

Two-wheeled self-balancing robot maintains balance and performs driving functions using two wheels, featuring excellent mobility due to its simple structure and wheel-driven system. However, when a long longitudinal structure is applied to increase space efficiency, challenges may arise in balance control and slope entry. In this study, a sliding mechanism and Model Predictive Control (MPC) were applied to achieve balance and driving control for a robot with a long longitudinal body. The system dynamics were analyzed using the Lagrangian method, and a reference for the sliding mechanism was generated to support balance control. Through Gazebo simulations, the performance of the MPC algorithm was verified, confirming that the robot could reach a stable balance state through Swing-up motion and maintain balance consistently. Additionally, stable driving performance was demonstrated in slope driving tests. We conducted experiments by applying the same algorithm to the actual robot, confirming that it successfully performed stable balance control and slope driving control in real-world environments. © ICROS 2025.

关键词： Model predictive control

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Synthesis and Characterization of Magnetic Nano Particle Materials (Fe2O3 & Fe3O4) Synthesized by Arc Discharge Method

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Journal of The Institution of Engineers (India): Series D 2025年 1-12页

作者： Junaidi, Md. Abdul Raheem Ranjitha, P. Kumar, K. V. Pradeep Rajanish, M. Reddy, Maramreddy Raghu Tilak Manjulaiah, Hareesha Thanuj Kumar, M. Nagaraj, P. Revanna, K. Raghavendra, N. Udayashankar, S. Mechanical Engineering Department Muffakham Jah College of Engineering & Technology Telangana Hyderabad500034 India Mechanical Engineering Department Dayanand Sagar College of Engineering Karnataka Bangalore560078 India Mechanical Engineering Department Ramaiah Institute of Technology Karnataka Bengaluru560054 India Mechanical Engineering Department Dayananda Sagar Academy of Technology and Management Karnataka Bengaluru560082 India Mechanical Engineering Department New Horizon College of Engineering Karnataka Bangalore560103 India Department of Mechanical Engineering Malnad College of Engineering Hassan573202 India Visvesvaraya Technological University Karnataka Belagavi590018 India Department of Robotics and Automation Rajarajeswari College of Engineering Bengaluru560074 India Department of Chemistry Yenepoya Institute of Technology Karnataka Mangalore574225 India Department of Mechanical Engineering Government Engineering College Krishnarajapet571426 India Department of Mechanical Engineering BNM Institute of Technology Karnataka Bangalore560070 India Department of Mechanical Engineering VTU Karnataka Belgaum590018 India

This research work thoroughly describes the process of obtaining and characterizing iron oxide (Fe3O4) nanoparticles as well as emphasizes how different pH levels, reaction environments and synthesis methods can respectively control its size or activity. Characterization of the crystalline structure, morphology and size of the nanoparticles was carried out. It describes key methods of synthesis such as arc discharge or electrode configuration in electrolyte solutions emphasizing on applied voltage or processing time, which resulted in good quality of nanoparticles, concluding with comparing particle diameters and prepared form of nanoparticles in mentioned methods. In this proposed synthesis mechanism, ferrous and ferric ions are hydroxylated in a controlled anaerobic process to yield Fe3O4 precipitates. Synthesis of the iron oxide (Fe3O4) nanoparticles was found to highly depend on pH parameters, and pH 11 was optimized as the favorable pH parameter based on the results acquired, as it well controls the growth and stability of the particles. The findings highlight the promise of Fe3O4 nanoparticles for various biomedicine and environmental remediation applications where particle stability, magnetic properties and cheap synthesis are crucial. © The Institution of Engineers (India) 2025.

关键词： Magnetic nanoparticles

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