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Evolution of hierarchical petal-like 3D SnS2 as high-performance electrode materials for supercapacitor applications

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Materials Today: Proceedings 2022年 67卷 1039-1042页

作者： Kumar, Niraj Bhusan Sahoo, Bibhuti Chandra Sahu, Krushna Kumar Sahoo, Naresh Naik, Brundabana Soam, Ankur Kumar, Rahul Tripathi, Abhishek Kumar Sahoo, Prasanta Maharashtra Pune 411025 India Department of Mechanical Engineering Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Chemistry Environmental Science and Technology Program Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Energy Science and Engineering IIT Delhi New Delhi 110016 India Department of Metallurgical and Materials Engineering Malaviya National Institute of Technology Jaipur Jaipur 302017 India

A simple one-step solvothermal approach has been adopted for the synthesis of SnS2. SEM shows hierarchically SnS2 with petal-like 3-dimensional layer structures because of this process. In this investigation, the as-prepared electrode material have an excellent specific capacitance of 721F g−1 at 1 mVs−1, indicating extraordinary performance. The improved electrochemical performance is because to unique ultrathin petal discrete structure, which provides increased electrolyte/electrode interface, high active sites, rapid ion/electron transfer, and short diffusion distances. A manufactured symmetric solid-state supercapacitor (SSC) device also has a large capacity to operate commercial LEDs, which allows for the assessment of its practical applicability in device-level application. According to the findings of this work, suitably layered 3D SnS2 electrode materials could be a promising route for the development of environmentally friendly energy storage applications. © 2022

关键词： Supercapacitor

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Automated Microrobotic Manipulation with Micron-scale Precision Using Multimodal Magnetic Microswarms

Automated Microrobotic Manipulation with Micron-scale Precis...

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2023 IEEE International Conference on Real-Time Computing and robotics, RCAR 2023

作者： Jiang, Jialin Yang, Lidong Zhang, Li The Chinese University of HongKong Department of Mechanical and Automation Engineering Hong Kong Hong Kong Department of Industrial and Systems Engineering China The Chinese University of Hong Kong Department of Surgery Hong Kong The Chinese University of Hong Kong Cuhk T Stone Robotics Institute Hong Kong Hong Kong The Chinese University of Hong Kong Chow Yuk Ho Technology Center for Innovative Medicine Hong Kong Hong Kong Science Park Multi-Scale Medical Robotics Center China

ISBN: (纸本)9798350327182

Untethered microrobots possess a promising perspective for micro-manipulation applications. With specifically designed morphologies and structures, microrobots are able to perform controllable delivery of target objects. However, the manipulation process still lacks autonomy, the picking, transporting, and releasing behaviors of microrobots need analysis. In this paper, we propose to achieve automated microrobotic manipulation with multimodal magnetic microswarms. The microswarm is composed of numerous Fe3O4 nanoparticles. When exposed to different dynamic magnetic fields (rotating magnetic field and oscillating magnetic field), the swarm could exhibit corresponding forms and generate attracting and repelling effects for micro-objects, respectively. Exploiting these two types of swarms, precise and controllable picking and releasing can be realized. The manipulation process is quantitatively divided into five stages, and a finite state machine (FSM) is presented to govern the transition between the stages. To guarantee accurate motion control of the swarm, a disturbance observer (DOB)-based super-twisting sliding mode control (STSMC) is designed. Experiments are conducted to validate the feasibility of the proposed manipulation scheme. The results demonstrate that the swarm is capable of automatically and effectively delivering micro-cargoes with different sizes to the target positions. © 2023 IEEE.

关键词： Magnetite

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!D-architected gratings for polarization-sensitive, nature-inspired structural color

arXiv

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arXiv 2024年

作者： Ibarra Miranda, Moisés H. Osterberg, Lars W. Shah, Dev H. Regulagadda, Kartik Poulikakos, Lisa V. Department of Mechanical and Aerospace Engineering Program of Materials Science and Engineering University of California San Diego La Jolla CA United States Program of Materials Science and Engineering University of California San Diego La Jolla CA United States Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla CA United States Laboratory for Multiphase Thermofluidics and Surface Nanoengineering Department of Mechanical Engineering University of California BerkeleyCA United States

Structural coloration, a color-generation mechanism often found in nature, arises from light-matter interactions such as diffraction, interference and scattering, with micro- and nanostructured elements. Herein, we systematically study anisotropic,:D-architected grating structures with polarization-tunable optical properties, inspired by the vivid blue of Morpho butterfly wings. Using two-photon lithography, we fabricate multilayered gratings, varying parameters such as height (through scanning speed and laser power), periodicity, and number of layers. In transmission, significant color transitions from blue to brown were identified when varying structural parameters and incident light polarization conditions (azimuthal angle and ellipticity). Based on thin film diffraction efficiency theory in the Raman-Nath regime, optical characterization results are analytically explained, evaluating the impact of each parameter variation. Overall, these findings contribute to technological implementations of polarization-sensitive,:D-architected gratings for structural color applications. Copyright © 2024, The Authors. All rights reserved.

关键词： Color

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Towards Scalable Automated Grading: Leveraging Large Language Models for Conceptual Question Evaluation in engineering 1

Towards Scalable Automated Grading: Leveraging Large Languag...

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1st Workshop on Large Foundation Models for Educational Assessment

作者： Gao, Rujun Guo, Xiaosu Li, Xiaodi Narayanan, Arun Balajiee Lekshmi Thomas, Naveen Srinivasa, Arun R. J. Mike Walker’66 Department of Mechanical Engineering Texas A&M University United States Computer Science Department University of Texas Dallas United States Intelligent Systems Program University of Pittsburgh United States Department of Artificial Intelligence and Informatics Mayo Clinic United States

This study explores the feasibility of using large language models (LLMs), specifically GPT-4o (ChatGPT), for automated grading of conceptual questions in an undergraduate mechanical engineering course. We compared the grading performance of GPT-4o with that of human teaching assistants (TAs) on ten quiz problems from the MEEN 361 course at Texas A&M University, each answered by approximately 225 students. Both the LLM and TAs followed the same instructor-provided rubric to ensure grading consistency. We evaluated performance using Spearman’s rank correlation coefficient and Root Mean Square Error (RMSE) to assess the alignment between rankings and the accuracy of scores assigned by GPT-4o and TAs under zero- and few-shot grading settings. In the zero-shot setting, GPT-4o demonstrated a strong correlation with TA grading, with Spearman’s rank correlation coefficient exceeding 0.6 in seven out of ten datasets and reaching a high of 0.9387. Our analysis reveals that GPT-4o performs well when grading criteria are straightforward but struggles with nuanced answers, particularly those involving synonyms not present in the rubric. The model also tends to grade more stringently in ambiguous cases compared to human TAs. Overall, ChatGPT shows promise as a tool for grading conceptual questions, offering scalability and consistency. © 2024 R. Gao1, X. Guo2, X. Li4, A.B.L. Narayanan3, N. Thomas1 & A.R. Srinivasa1.

关键词： Mean square error

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A Novel Design of Soft Pneumatic Actuator with Variable Stiffness Using Granular Jamming

A Novel Design of Soft Pneumatic Actuator with Variable Stif...

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International Conference on Advanced robotics and Mechatronics (ICARM)

作者： Yuanzhong Li Hiroyuki Ishii Graduate School of Creative Science and Engineering Waseda University Tokyo Japan Department of Modern Mechanical Engineering Waseda University Tokyo Japan Humanoid Robotics Institute Waseda University Tokyo Japan

ISBN: (数字)9798350385724

ISBN: (纸本)9798350385731

Soft robotics is attracting researchers’ interest with its advantages of flexibility and portability in current years. Soft pneumatic actuator is a popular design to be used on soft manipulator and gripper. In comparison of rigid actuator, the softness of material limits the controllability and stability under constrained conditions. On the other hand, soft pneumatic actuator with controllable stiffness can overcome this challenge. In this research, we present a design of soft pneumatic actuator using granular jamming to vary the stiffness of actuator. This actuator is a cylinder which has 70mm length and 25 mm diameter, which can bend from 12.8° to 45.6°. By combining the granular jamming with soft pneumatic actuator, this actuator has variability of stiffness and keeps the softness of soft actuator.

关键词： Pneumatic actuators Mechatronics Force Soft robotics Bending Manipulators Controllability Time factors Jamming Grippers

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Experimental Study and CFD Simulation of Air-Water Bubbly Flow in a Rectangular Channel 20

Experimental Study and CFD Simulation of Air-Water Bubbly Fl...

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20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023

作者： Liu, Qingqing Liu, Yang Sun, Xiaodong Wang, Dewei Liu, Yang Buchanan, John Worosz, Ted Department of Nuclear Engineering and Radiological Sciences University of Michigan 2355 Bonisteel Blvd Ann ArborMI48109-2104 United States Nuclear Engineering Program Department of Mechanical Engineering Virginia Tech 635 Price Fork Road BlacksburgVA24061 United States Naval Nuclear Laboratory PO Box 79 West MifflinPA15122 United States

ISBN: (纸本)9780894487934

This paper presents an experimental study that measures the liquid-phase velocity and turbulence in upward air-water two-phase flow using a particle image velocimetry-planar laser-induced fluorescence (PIV-PLIF) system. The test section is a vertical 30 mm × 10 mm rectangular channel with a height of 3.0 m. Experimental data were collected at three instrumentation ports along the test section with the normalized axial distances of z/Dh = 8.8, 72.4, and 136.0 from the exit of a two-phase flow injector. Three bubbly flow conditions were studied with the gas and liquid superficial velocities ranging from 0.03 to 0.25 m/s and from 0.8 to 3.0 m/s, respectively. The void fraction was measured by double-sensor conductivity probes. The two-dimensional (2-D) distributions of the local time-averaged liquid velocity, Reynolds stress, turbulence kinetic energy (TKE), and turbulence intensity were obtained from the PIV-PLIF measurements. This study adds a dataset of 2-D liquid-phase velocity and turbulence measurements in bubbly flows to the literature, which could assist with two-phase turbulence model development as well as two-phase high-fidelity computational model/code assessment and validation. In addition, multiphase computational fluid dynamics (MCFD) simulations were performed using ANSYS FLUENT for the three bubbly flows in the rectangular flow channel. The Eulerian-Eulerian multiphase approach with the k-ω shear stress transport turbulence model was used in the MCFD simulations. In general, the relative differences between the experimental data and simulation results for the local liquid velocity are less than 10% in the central region of the flow channel but can be up to 25% near the wall region. The MCFD code predicts the Reynolds normal stress in the spanwise direction more accurately than that in the streamwise direction. It also predicts the Reynolds shear stress relatively well in the central region but not as good in the near-wall region. © 2023 Proceedings of

关键词： Computational fluid dynamics

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Suitability of Sacrum Motion in Computing Dynamic Gait Stability Indices

Suitability of Sacrum Motion in Computing Dynamic Gait Stabi...

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Ziqi Liu Tomohito Kuroda Shogo Okamoto Yasuhiro Akiyama Department of Computer Science Tokyo Metropolitan University Hino Japan Department of Mechanical Engineering and Robotics Shinshu University Ueda Japan

Gait stability indices are expected to preemptively detect people at high risk of falling. Among these, the margin of stability (MoS) is known as a valid index. Usually, the computation of MoS requires the motion-related information of multiple feature points of the body; however, we have been pursuing the use of only one feature point. We estimated the anterior and mediolateral MoS values from the velocity time series of the sacrum, knee, or toe using principal motion analysis. Based on open gait data for 60 people over 60 years of age, the sacrum was best suited for computing MoS in the anterior and mediolateral directions. The correlation coefficients between the estimated and observed values were 0.77 and 0.73, respectively. Our findings will help establish an easy-to-access and accurate measurement of MoS values using an inertial measurement unit attached to a body feature.

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A Comparative Analysis of Modular Design Methods: A Case Study of a Horizontal Flipping Workpiece Machine

A Comparative Analysis of Modular Design Methods: A Case Stu...

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IEEE International Conference on Industrial engineering and engineering Management

作者： T. Assawarungsri N. Tunsakul N. Janthong Department of Mechanical Engineering Technology College of Industrial Technology King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Production and Robotics Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9798350386097

ISBN: (纸本)9798350386103

This study examines the efficiency of modular design methodologies by comparing traditional methods with advanced approaches, specifically Axiomatic Design and DSM Cladistics Analysis. Utilizing a horizontal flipping workpiece machine case study, the research evaluates the modularity index of various clustering techniques. The traditional methods, Design Structure Matrix (DSM) and Hierarchical Clustering, are assessed against the newer methodologies to determine their effectiveness in grouping components modularly. Results indicate that Axiomatic Design and DSM Cladistics Analysis significantly enhance modular design, offering superior performance and control ease. This comparative analysis highlights the potential of advanced methodologies to improve machinery design, suggesting a paradigm shift towards these innovative approaches for enhanced modularization in engineering practices.

关键词： Design methodology Scalability engineering management Industrial engineering Phylogeny Maintenance Indexes Machinery Optimization

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A Pilot Study on Fabric-based Pneumatic Soft Gloves for Assisting Patients with Severe Brachial Plexus Injury

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IEEE Transactions on Biomedical engineering 2025年 PP卷 PP页

作者： Feng, Miao Yang, Dezhi Sun, Jianing Lao, Jie Rui, Jing Gu, Guoying Shanghai Jiao Tong University Robotics Institute State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Key Laboratory of Intelligent Robotics Meta Robotics Institute Shanghai200240 China Southwest Technology and Engineering Research Institute Chongqing400039 China Fudan University Department of Hand Surgery Huashan Hospital China NHC Key Laboratory of Limbs Reconstruction Shanghai Key Laboratory of Peripheral Nerve and Microsurgery Shanghai200040 China

Objective: Robotic gloves show promise in hand assistance due to their wearability and home-based potential, yet empirical research remains limited. This pilot study presents a fabric-based pneumatic soft glove, aiming to identify its potential and challenges in clinical practice by evaluating its effectiveness in assisting patients with severe brachial plexus injury (BPI). Methods: The glove integrates a thumb abduction actuator and four bidirectional fabric-based pneumatic actuators (FPAs) with asymmetric chambers for high output force. Sixteen healthy volunteers and five individuals with BPI, all of whom lacked active hand and wrist movements, were recruited. Participants performed object grasping across 25 cm. The healthy group performed seven tasks using objects weighing up to 2 kg, with muscle activities recorded for analysis. The BPI group further performed tasks with eight objects from the action research arm test (ARAT) and twelve objects for activities of daily living (ADLs), encompassing various sizes, weights, and geometries. Results: In the healthy group, sEMG showed a decrease in 89.3% of trials, with 56.0% of these decreases being significant (p © 1964-2012 IEEE.

关键词： Pneumatic actuators

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Influence of directional solidification parameters on the amount of quasicrystalline phase of an AlCuFe alloy

Journal of Alloys and Metallurgical Systems

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Journal of Alloys and Metallurgical Systems 2025年 9卷

作者： dos Santos Barros, Thayza Pacheco Caluête, Rafael E. da Silva, Aline Karla Barbosa de Oliveira, Danniel Ferreira Feitosa, Francisco Riccelly Pereira de Lima, Bruno Alessandro Silva Guedes de Lima, Danielle Guedes Federal University of Paraíba Graduate Program in Mechanical Engineering PB João Pessoa58051-900 Brazil Federal University of Paraíba Department of Mechanical Engineering PB João Pessoa58051-900 Brazil Federal University of Paraíba Department of Materials Engineering João Pessoa58051-900 Brazil

In this work, a casting processing route via unidirectional solidification is proposed, where the severity of cooling can be increased to maximize the amount of quasicrystalline phase. For this, the alloy with nominal composition Al62.5Cu25Fe12.5 was melted and solidified unidirectionally under optimized processing conditions. Our results evidenced a dependence of the quasicrystalline phase percentage, obtained for an AlCuFe alloy, as a function of the position of the ingot and the type of mold used during the directional solidification process. This analysis expands the spectrum of studies on structural properties, for alloys of the AlCuFe system, indicating the cooling conditions, during the directional solidification process, necessary to maximize the amount of quasicrystalline phase. © 2024 The Authors

关键词： Iron alloys

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