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Correction to: Emergence of melt and glass states of halide perovskite semiconductors (Nature Reviews materials, (2025), 10.1038/s41578-024-00759-x)

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Nature Reviews materials 2025年

作者： Singh, Akash Mitzi, David B. Department of Mechanical Engineering and Materials Science Duke University DurhamNC United States University Program in Materials Science and Engineering Duke University DurhamNC United States Department of Chemistry Duke University DurhamNC United States

Correction to: Nature Reviews materialshttps://***/10.1038/s41578-024-00759-x, published online 9 January 2025 In the version of the article initially published, the Acknowledgements section was missing and has now been added to read "This work is supported by the National science Foundation under grant no. DMR-2114117" in the HTML and PDF versions of the article. © Springer Nature Limited 2025.

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Applications of Acoustic Emission Monitoring in Grinding: A Review

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International Journal of Precision engineering and Manufacturing - Green Technology 2025年 1-26页

作者： Jia, Jianfei Guo, Bing Krajnik, Peter Gu, Yan Wu, Guicheng Yao, Honghui Zhao, Huan Li, Kenan Yang, Wei Zhao, Qingliang Center for Precision Engineering School of Mechatronics Engineering Harbin Institute of Technology P.O. Box 413 Harbin150001 China Department of Industrial and Materials Science Chalmers University of Technology Gothenburg Sweden Chongqing Research Institute Harbin Institute of Technology Chongqing401120 China Sichuan Aerospace Fenghuo Servo Control Technology Co. Ltd Chengdu611130 China Zhongshan Sprecision Technology Co. Ltd Zhongshan528437 China State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory for High Performance Tools Zhengzhou Abrasive Grinding Research Institute Co. Ltd Henan450001 China

Grinding is typically the final operation in many manufacturing chains owing to its ability to achieve high surface quality. However, any failure in this process can lead to irreparable damage to the workpiece and increased costs. Reliable, online, and onsite monitoring techniques must be implemented to avoid these problems. Over the past decades, various technologies have been developed to monitor grinding processes, utilizing a range of signals. Among these, acoustic emission (AE) has demonstrated significant advantages, including high sensitivity to fine dynamic interactions between the grinding wheel and workpiece, as well as excellent performance in filtering mechanical noise. Consequently, AE is widely recognized as one of the most effective monitoring and detection methods in grinding. However, comprehensive literature reviews on AE monitoring in grinding remain scarce. This paper provides an overview of the history and sources of AE monitoring in grinding. Subsequently, it outlines the process of AE monitoring in grinding and introduces different methods applied in AE monitoring. Lastly, research gaps and future trends for the applications of AE monitoring in grinding are highlighted. Overall, this paper systematically summarizes the monitoring system, analysis methods, and practical applications of AE in grinding, while also identifying knowledge gaps and scope for future work. © The Author(s), under exclusive licence to Korean Society for Precision engineering 2025.

关键词： Precision engineering

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Large eddy simulation of partially-premixed O2–H2 combustion with steam dilution in multi-cluster jet

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International Journal of Hydrogen Energy 2025年

作者： Siahaan, Gabriele Maruli Tondi Jiang, Shan Tanahashi, Mamoru Juangsa, Firman Bagja Mechanical Engineering Undergraduate Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Thermal Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Department of Mechanical Engineering Institute of Science Tokyo 2-12-1 Ookayama Meguro-ku Tokyo152-8550 Japan

Over the past 150 years, carbon dioxide levels in the atmosphere have risen significantly, causing a rise in temperatures due to disruptions in the natural carbon cycle. One proposed solution is transitioning to non-carbon fuels like hydrogen, which requires modifications to current gas turbine systems despite its higher flame temperature and flammability than carbon-based fuels. A suggested modification involves a non-premixed multi-cluster jet configuration with steam dilution to achieve a lifted flame. Steam dilution is utilized to lower the combustion temperature due to material limitations and to achieve a high systematical efficiency, which can be achieved through the Graz Cycle system. This study employs large eddy simulation (LES) to analyze oxy-hydrogen combustion with steam dilution, focusing on flow dynamics, flame structure, and combustion behavior. The study also examines the impact of oxidizer jet angles and fuel jet velocities. Three simulations with different oxidizer jet angles and four variations of fuel jet velocity reveal that narrower oxidizer jet angles produce richer combustion regions. Larger oxidizer jet angles yield less turbulent flow but a more stable flame. In contrast, higher fuel jet velocities intensify turbulence, resulting in a more stable flame. This can occur since the combustion shifts towards stoichiometric and rich combustion region as fuel jet velocity increases. A more pronounced recirculation flow and enhanced mixing process also allow the flame to hold on to the flame anchor, which helps reach a more stable flame. The maximum heat release rates within the simulation domain are approximately 270 W and 250 W for angle and fuel jet velocity cases, respectively. © 2025 Hydrogen Energy Publications LLC

关键词： Steam

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Large spin accumulation signals in ultrafast magneto-optical experiments.

arXiv

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arXiv 2025年

作者： Anadón, Alberto Singh, Harjinder Díaz, Eva Le-Guen, Yann Hohlfeld, Julius Wilson, Richard B. Malinowski, Gregory Hehn, Michel Gorchon, Jon Université de Lorraine CNRS IJL NancyF-54000 France Department of Mechanical Engineering and Materials Science and Engineering Program University of California RiversideCA United States

Magneto-optical techniques have become essential tools in spintronics, enabling the investigation of spin dynamics in the ultrafast regime. A key challenge in this field has been to accurately isolate the contributions to magneto-optical signals of spin transport phenomena from the local magnetization dynamics. The contribution of transported and accumulated spins was long believed to be orders of magnitude smaller than that of the magnetization and thus previous approaches to disentangle these signals have relied on specific experimental designs, usually including thick metal layers. Here, we present experimental evidence demonstrating that the magneto-optical signal from ultrafast spin accumulations can, under certain conditions, be comparable to or even exceed that of the magnetic layer in a standard ultrafast demagnetization experiment. Our findings provide a new framework for accessing and isolating these spin accumulations, allowing for time and depth dependent probing of transported spin and/or orbital angular momentum. © 2025, CC BY.

关键词： Spin dynamics

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A novel photovoltaic/thermal (PVT) system using nano-enhanced micro-encapsulated PCM slurry for steam production: A numerical study

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International Journal of Thermofluids 2025年 27卷

作者： Azmeer, Ahmed Sheikh, Yahya Kanjo, Hasan A. Sabouni, Hamzeh Physical Science and Engineering Department King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates Department of Sustainable and Renewable Energy Engineering University of Sharjah Sharjah United Arab Emirates Materials Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates

As industries reliant on steam-based processes strive to reduce fossil fuel consumption and carbon emissions, interest in renewable technologies, particularly photovoltaic/thermal (PVT) systems that generate both thermal and electrical energy, is increasing. However, the limited thermal performance of PVT systems remains a key barrier. Traditional working fluids, such as water, nanofluids, and phase change material (PCM) slurries, exhibit low thermal conductivity, poor temperature regulation, and inefficient heat storage. To address these issues, a novel working fluid incorporating graphene oxide (GO) nanoparticles into microencapsulated PCM (MPCM) slurry is proposed. The integration of GO nanoparticles not only enhances the dispersion stability of the MPCM slurry but also significantly increases its thermal conductivity, leading to improved heat dissipation from PV cells. A comprehensive CFD investigation is conducted using ANSYS Fluent 2021, employing an Eulerian–Eulerian multiphase model to simulate the three-phase flow. In this model, water serves as the primary phase, while GO nanoparticles and MPCM function as secondary dispersed phases. The results demonstrate that increasing the GO volume fraction from 0 to 0.005 reduces average PV cell temperatures by up to 5°C at 40°C. Additionally, the nano-enhanced MPCM slurry achieves a thermal efficiency of 88.1 % and an electrical efficiency of 10.3 %. It is also found that using MPCM slurry as the working fluid, a 15 % volume fraction of MPCM with a melting point of 40°C achieves the highest thermal efficiency of 90.1 %, outperforming water by 20.1 % and surpassing previous studies on MPCM slurry and nanofluids. © 2025 The Author(s)

关键词： Nanofluidics

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Insights into the role of metal dopant on ammonia decomposition over graphene-supported Ni6, Ni5Pt, and Ni5Rh clusters

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International Journal of Hydrogen Energy 2025年 130卷 168-175页

作者： Yusuf, Alfani Budiantono, Reva Juangsa, Firman Bagja Aziz, Muhammad Budiyanto, Muhammad Arif Saputro, Adhitya Gandaryus Mahyuddin, Muhammad Haris Graduate Program of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia PLN Nusantara Power UMRO Jl. Pluit Karang Ayu Barat No. 1 Jakarta14450 Indonesia Thermal Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Institute of Industrial Science The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8505 Japan Department of Mechanical Engineering Universitas Indonesia Depok16424 Indonesia Quantum and Nano Technology Research Group Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Research Center for Nanoscience and Nanotechnology Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Ammonia (NH3) is a promising hydrogen (H2) carrier, owing to its high hydrogen content and ease of storage. However, efficient catalytic decomposition of NH3 to H2 remains challenging. This study investigates the catalytic activity of graphene-supported Ni6, Ni5Pt, and Ni5Rh clusters for NH3 decomposition to N2 and H2 using density functional theory (DFT) calculations. The results show that the addition of Pt and Rh dopants weakens the adsorption of intermediates formed during the NH3 dehydrogenation step and slightly increases the activation energies. Interestingly, however, this drawback becomes a key factor in enhancing the activity of the subsequent N–N association and H–H recombination steps, which are critical for the reaction to cycle. Our electronic structure analysis reveals that the decreased activity in the NH3 dehydrogenation step but increased activity in the N2 and H2 formation steps are due to the ligand effect exerted by Pt and Rh. Specifically, since the metal dopants have higher electronegativities than Ni, the number of electrons at the preferred Ni-edge site decreases and eventually weakens the adsorption. Furthermore, the spatially broad nature of the Pt-5d and Rh-4d orbitals delocalizes the cluster's electron distribution, which weakens the 2N and 2H adsorption and thus eases the N2 and H2 formation. This study provides insights into the role of noble metal dopants in optimizing Ni-based catalysts for NH3 decomposition, paving the way for efficient H2 utility technologies. © 2025 Hydrogen Energy Publications LLC

关键词： Dehydrogenation

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A preliminary data fusion study to assess the feasibility of Foundation Process-Property Models in Laser Powder Bed Fusion

arXiv

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arXiv 2025年

作者： Vendrell-Gallart, Oriol Negarandeh, Nima Foumani, Zahra Zanjani Amiri, Mahsa Valdevit, Lorenzo Bostanabad, Ramin Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States Materials and Manufacturing Technology Program University of California IrvineCA92697 United States Department of Materials Science and Engineering University of California IrvineCA92697 United States Department of Civil and Environmental Engineering University of California IrvineCA92697 United States

Foundation models are at the forefront of an increasing number of critical applications. In regards to technologies such as additive manufacturing (AM), these models have the potential to dramatically accelerate process optimization and, in turn, design of next generation materials. A major challenge that impedes the construction of foundation process-property models is data scarcity. To understand the impact of this challenge, and since foundation models rely on data fusion, in this work we conduct controlled experiments where we focus on the transferability of information across different material systems and properties. More specifically, we generate experimental datasets from 17-4 PH and 316L stainless steels (SSs) in Laser Powder Bed Fusion (LPBF) where we measure the effect of five process parameters on porosity and hardness. We then leverage Gaussian processes (GPs) for process-property modeling in various configurations to test if knowledge about one material system or property can be leveraged to build more accurate machine learning models for other material systems or properties. Through extensive cross-validation studies and probing the GPs’ interpretable hyperparameters, we study the intricate relation among data size and dimensionality, complexity of the process-property relations, noise, and characteristics of machine learning models. Our findings highlight the need for structured learning approaches that incorporate domain knowledge in building foundation process-property models rather than relying on uninformed data fusion in data-limited applications. © 2025, CC BY.

关键词： Data fusion

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Achieving rapid actuation in liquid crystal elastomers

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National science Open 2025年第2期4卷 63-85页

作者： Changyue Liu Liuchao Jin Wei-Hsin Liao Zhijian Wang Qiguang He Tianmushan Laboratory Key Laboratory of Aerospace Advanced Materials and Performance Ministry of EducationSchool of Materials Science and EngineeringBeihang University Department of Mechanical and Automation Engineering The Chinese University of Hong Kong

Liquid crystal elastomer (LCE) is one kind of soft actuating material capable of producing large and reversible actuation strain,versatile and programmable actuation modes,and high work density,which can be widely exploited for nextgeneration soft ***,the slow response speed and low power density in LCE-based actuators remain a challenge,limiting their practical *** have been considering how to improve these *** this review,we discuss the fundamentals of the LCEs and emphasize the fast actuation strategies developed in recent ***,we introduce conventional preparation ***,we describe typical actuation mechanisms of LCEs,discussing their features and ***,we summarize several possible approaches as case studies to enhance the actuation performance of LCEs,including reducing physical sizes,introducing active heating-cooling mechanisms,utilizing mechanical instability,and developing dielectric ***,we discuss the future research opportunities and challenges for rapid actuation of LCEs.

关键词： liquid crystal elastomer soft robotics rapid actuation

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Saturable intercalation doping enables scalable and selective graphene gas sensors on plastic

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Chemical engineering Journal 2025年 515卷

作者： Kwon, Bitnuri Lee, Jung Hun Jo, Sae Byeok Hwang, Jinhyun Lee, Donggeun Cha, Jonghyun Lim, Soomook Suk, Ji Won Lee, Wi Hyoung Department of Organic and Nano System Engineering Konkuk University Seoul05029 Cuba Department of Materials Science and Engineering and the Materials Research Center Northwestern University 2220 Campus Drive EvanstonIL60208-3108 United States School of Chemical Engineering Sungkyunkwan University Suwon16419 Cuba Sungkyunkwan University Suwon16419 Cuba Advanced Materials Program Department of Materials Science and Engineering Konkuk University Seoul05029 Cuba School of Mechanical Engineering Sungkyunkwan University Suwon16419 Cuba Department of Smart-Fab. Technology Sungkyunkwan University Suwon16419 Cuba Department of Materials Science and Engineering Konkuk University Seoul05029 Cuba

Developing highly sensitive and selective gas sensors for nitrogen dioxide (NO2) detection remains crucial for environmental monitoring and public health protection. Graphene-based chemiresistive sensors show promise due to their exceptional electronic properties and high surface area, which enhance gas adsorption. However, they face persistent challenges in selectivity, stability, and sensitivity characteristics. This study presents a facile one-step molecular intercalation doping approach that can effectively overcome these limitations. By intercalating carefully selected dopant molecules between graphene and flexible substrates during the wet-transfer process, we achieve uniform doping distribution while maintaining intrinsic carrier mobility. The resulting sensors demonstrate remarkable NO2 detection capabilities with a limit of detection of 1 ppb at room temperature. Importantly, the intercalated devices exhibit exceptional stability over extended periods of time and show minimal cross-sensitivity to common interfering gases. Moreover, the sensors retain their sensing characteristics under mechanical deformation, including fully transparent gas sensors with a dogbone structure, thereby enabling seamless integration into wearable monitoring systems. Our scalable fabrication process and comprehensive understanding of the intercalation doping mechanism provide a practical pathway for the development of reliable, flexible gas sensors capable of addressing real-world environmental and healthcare challenges. © 2025 Elsevier B.V.

关键词： pH sensors

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Flight Demonstration of Detonation Engine System Using Sounding Rocket S-520-34: Performance of Rotating Detonation Engine Using Liquid Propellants

Flight Demonstration of Detonation Engine System Using Sound...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Sato, Tomoki Matsuoka, Ken Itouyama, Noboru Yasui, Masaaki Matsuyama, Koichi Ide, Yuichiro Nakata, Kotaro Suzuki, Yamato Ishibashi, Ryoto Suzuki, Sota Kasahara, Jiro Kawasaki, Akira Hirashima, Hidetoshi Nakata, Daisuke Eguchi, Hikaru Takano, Tomoyuki Uchiumi, Masaharu Matsuo, Akiko Funaki, Ikkoh Habu, Hiroto Arakawa, Satoshi Masuda, Junichi Kawahara, Kosuke Usuki, Tomoaki Maehara, Kenji Shida, Maki Nakao, Tatsuro Yamada, Kazuhiko Himeno, Takehiro Yahata, Yusei Department of Aerospace Engineering Nagoya University Aichi Nagoya464-8603 Japan Institute of Materials and Systems for Sustainability Nagoya University Aichi Nagoya464-8603 Japan Department of Engineering Shizuoka University Hamamatsu Shizuoka464-8603 Japan Department of Aerospace Systems Engineering Sojo University Kumamoto Kumamoto860-0082 Japan Aerospace Plane Research Center Muroran Institute of Technology Hokkaido Muroran100-0014 Japan Department of Mechanical Engineering Keio University Kanagawa Yokohama223-8522 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Kanagawa252-5210 Japan Sounding Rocket Research and Operation Group Japan Aerospace Exploration Agency Sagamihara Kanagawa252-5210 Japan Research Unit II Research and Development Directorate Japan Aerospace Exploration Agency Sagamihara Kanagawa252-5210 Japan Research Unit I Sagamihara Kanagawa252-5210 Japan Department of Aeronautics and Astronautics Tokyo University Tokyo Bunkyo113-8656 Japan

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

One of the most important aspects of aerospace engineering applications is to create new "flyable" systems. We plan to demonstrate Detonation Engine System2 (DES2) operation using liquid propellants in the space environment for the first time, using the sounding rocket S-520-34. A cylindrical rotating detonation engine was used with liquid ethanol as fuel and liquid nitrous oxide as oxidizer. The plume images were successfully acquired by the onboard digital and analog cameras, and the ignition was successful, which can be confirmed from the image. From pressure and temperature histories, nitrous oxide was considered to be supplied into the combustor with nitrogen from X+125.5 s. Therefore, the combustion pressure decreased due to decrease in total mass flow rate. From the Short-time Fourier transform (STFT) result, a peak value of 21.0 kHz (two-wave mode) was measured, and a peak value of 13.5 kHz (single wave mode) was measured. Therefore, the bipropellant RDE operation was successful. As for the propulsive performance, we measured the RDE axial thrust from the flyable system’s axial acceleration directly, and the thrust was in good agreement with the value calculated from the combustion pressure. In addition, the specific impulse efficiency of 82±7% was achieved. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Detonation

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