检索结果-内蒙古大学图书馆

arXiv 2025年

作者： Paruchuri, Aanish Thrasher, Carl Hart, A.J. Macfarlane, Robert Jayaraman, Arthi Science in Data Science Program University of Delaware NewarkDE19713 United States Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Chemical and Biomolecular Engineering University of Delaware 150 Academy St NewarkDE19713 United States Department of Materials Science and Engineering University of Delaware NewarkDE19713 United States Data Science Institute University of Delaware NewarkDE19713 United States

Nanoparticle superlattices consisting of ordered arrangements of nanoparticles exhibit unique optical, magnetic, and electronic properties arising from nanoparticle characteristics as well as their collective behaviors. Understanding how processing conditions influence the nanoscale arrangement and microstructure is critical for engineering materials with desired macroscopic properties. Microstructural features such as grain boundaries, lattice defects, and pores significantly affect these properties but are challenging to quantify using traditional manual analyses as they are labor-intensive and prone to errors. In this work, we present a machine learning workflow for automating grain segmentation in scanning electron microscopy (SEM) images of nanoparticle superlattices. This workflow integrates signal processing techniques, such as Radon transforms, with unsupervised learning methods like agglomerative hierarchical clustering to identify and segment grains without requiring manually annotated data. In the workflow we transform the raw pixel data into explainable numerical representation of superlattice orientations for clustering. Benchmarking results demonstrate the workflow's robustness against noisy images and edge cases, with a processing speed of four images per minute on standard computational hardware. This efficiency makes the workflow scalable to large datasets and makes it a valuable tool for integrating data-driven models into decision-making processes for material design and analysis. For example, one can use this workflow to quantify grain size distributions at varying processing conditions like temperature and pressure and using that knowledge adjust processing conditions to achieve desired superlattice orientations and grain sizes. © 2025, CC BY.

关键词： Grain boundaries

来源：评论

学校读者我要写书评

暂无评论

Microfluidic Synthesis of Ag@Fe3o4-Coated Helical Microfibers for High-Sensitivity Surface Enhanced Raman Spectroscopy

SSRN

引用

SSRN 2025年

作者： Sharma, Kajal Nguyen, Lan Liu, Jingying Cao, Chang Ou, Qingdong Jasieniak, Jacek Gundabala, Venkat Alan, Tuncay Dynamic Micro Devices Laboratory Department of Mechanical and Aerospace Engineering Monash University ClaytonVIC3800 Australia Bombay Powai Mumbai400076 India Department of Materials Science and Engineering Monash University ClaytonVIC3800 Australia ARC Centre of Excellence in Exciton Science Monash University ClaytonVIC3800 Australia Faculty of Innovation Engineering Taipa999078 China

HypothesisSurface-enhanced Raman spectroscopy (SERS) is a powerful technique that significantly enhances the Raman scattering signals of molecules adsorbed on specific substrates to detect a wide range of chemical and biological analytes with a high sensitivity and specificity. Traditional substrates often have limitations in terms of reproducibility, sensitivity, and ease of fabrication. Despite their huge potential for rapid detection, there is a high demand for multifunctional substrates that can be produced at a low cost and are capable of flexible bending and mobility for sample collection. Here, we hypothesize a helical microfibrous substrate uniformly coated with nanoparticles (NPs) will enhance SERS detection by increasing the surface area for analyte adsorption and improving light scattering, leading to stronger signal amplification compared to traditional flat ***@Fe3O4 core-shell NPs were synthesized via a microwave-assisted solvothermal method, followed by PEI coating. These NPs were then used to coat PVDF-HFP helical microfibers in a microfluidic device in the presence of an external magnet. The flow rates of the inner and outer solutions were varied to study their effects on microfiber morphology and deposition and to evaluate their SERS sensitivity for Rhodamine B sensing across a wide concentration range (10-10 - 10-5 M).FindingsThe finding confirmed that the magnetically assisted microfluidic synthesis of Ag@Fe3O4 core-shell NP-decorated helical microfibers resulted in a significant enhancement of the SERS effect. Characterization by Scanning Electron Microscopy (SEM), High-Resolution Transmission Electron Microscopy (HR-TEM), and X-Ray Diffraction (XRD) confirmed the successful synthesis of Ag@Fe3O4 core-shell NPs and their deposition on the helical microfiber. The 3D substrate demonstrated a high SERS sensitivity for Rhodamine B sensing across a wide concentration range (10-10 - 10-5 M). © 2025, The Authors. All rights reserve

关键词： High resolution transmission electron microscopy

来源：评论

学校读者我要写书评

暂无评论

Harnessing Discrete Differential Geometry: A Virtual Playground for the Bilayer Soft Robotics

arXiv

引用

arXiv 2025年

作者： Li, Jiahao Tong, Dezhong Hao, Zhuonan Zhu, Yinbo Wu, Hengan Liu, Mingchao Huang, Weicheng CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230027 China Department of Material Science and Engineering University of Michigan Ann ArborMI48105 United States Department of Mechanical and Aerospace Engineering University of California Los AngelesCA90095 United States Department of Mechanical Engineering University of Birmingham BirminghamB15 2TT United Kingdom School of Engineering Newcastle University Newcastle upon TyneNE1 7RU United Kingdom

Soft robots have garnered significant attention due to their promising applications across various domains. A hallmark of these systems is their bilayer structure, where strain mismatch caused by differential expansion between layers induces complex deformations. Despite progress in theoretical modeling and numerical simulation, accurately capturing their dynamic behavior, especially during environmental interactions, remains challenging. This study presents a novel simulation environment based on the Discrete Elastic Rod (DER) model to address the challenge. By leveraging discrete differential geometry (DDG), the DER approach offers superior convergence compared to conventional methods like Finite Element Method (FEM), particularly in handling contact interactions – an essential aspect of soft robot dynamics in real-world scenarios. Our simulation framework incorporates key features of bilayer structures, including stretching, bending, twisting, and inter-layer coupling. This enables the exploration of a wide range of dynamic behaviors for bilayer soft robots, such as gripping, crawling, jumping, and swimming. The insights gained from this work provide a robust foundation for the design and control of advanced bilayer soft robotic systems. © 2025, CC BY-NC-ND.

关键词： Machine design

来源：评论

学校读者我要写书评

暂无评论

Low voltage graphene interface engineered organic ferroelectric tunnel junction devices

arXiv

引用

arXiv 2025年

作者： Natani, S. Khajanji, P. Cheng, L. Eshraghi, K. Zhang, Z. Shipley, W. Tao, A. Bandaru, P.R. Department of Mechanical Engineering University of California San Diego La Jolla CA United States Program in Materials Science University of California San Diego La Jolla CA United States Applied Materials Santa ClaraCA United States

It has been indicated 1 that the path forward for the widespread usage of ferroelectric (FE) materials may be considerably facilitated through the reduction of programming voltages to on-chip logic compatible values o... 详细信息

关键词： Ferroelectric devices

来源：评论

学校读者我要写书评

暂无评论

Fabrication of self-supporting hierarchical porous metallic glass for pH-universal hydrogen evolution reaction

引用

Chemical engineering Journal 2025年 515卷

作者： Zhao, Xingran Liu, Junsheng Zhang, Heting Jiang, Jihan Lin, Jiaqing Fu, Jianan Zhang, Yu Li, Xin Ruan, Wenqing Ma, Jiang Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control Engineering Shenzhen University Shenzhen518060 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China School of Mechanical Electrical and Information Engineering Shandong University Weihai264209 China

The development of efficient pH-universal electrocatalysts is crucial for large-scale hydrogen production via the electrochemical hydrogen evolution reaction (HER). A simple and environmentally benign dissolution manufacturing (DM) strategy is adopted to synthesize a self-supported hierarchical porous Pt-based metallic glass (HPMG) catalyst. In a pH-universal electrolyte, the HPMG demonstrates remarkable HER performance. At 10 mA cm−2, the optimal HPMG-4 catalyst shows low overpotentials of 35 mV in 1.0 M KOH, 16 mV in 0.5 M H2SO4, and 54 mV in a 1.0 M phosphate buffer solution. The catalyst also exhibits a large electrochemically active surface area and outstanding stability. The hierarchical porous structure of HPMG-4 is attributed to its hydrophilic and gas-repellent properties, which are critical factors contributing to the excellent HER activity. Additionally, the continuously renewed active sites are believed to enhance the performance. Computational analyses indicate that the amorphous structure reduces the energy barrier for water adsorption and dissociation, with a hydrogen ad/desorption free energy value close to zero (−0.067 eV). In conclusion, this study provides a universal strategy for developing HER catalysts with exceptional activity and stability across diverse media. © 2025 Elsevier B.V.

关键词： Amorphous alloys

来源：评论

学校读者我要写书评

暂无评论

Magnetotransport properties and Shubnikov–de Haas oscillations in a type-II nodal-line semimetal candidate n-type Mg3Bi2 single crystal

引用

Physical Review B 2025年第7期111卷 075163-075163页

作者： Yosuke Goto Masayuki Murata Hidetomo Usui Keigo Ono Joseph P. Heremans Taichi Terashima Chul-Ho Lee National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8568 Japan Department of Applied Physics Shimane University Matsue 690-8504 Japan Department of Applied Physics and Physico-Informatics Faculty of Science and Technology Keio University Yokohama Kanagawa 223-8522 Japan Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 USA Research Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Tsukuba Ibaraki 305-0003 Japan

Mg3Bi2 is a candidate type-II nodal-line semimetal (a novel category of topological semimetals). However, the exotic transport properties of Mg3Bi2 single crystals are yet to be elucidated. Herein, we report the magnetotransport properties of an n-type Mg3Bi2 single crystal grown from a melt. The results revealed that the single crystal exhibited a very large, nonsaturating magnetoresistance (5000%) under an 8-T field, significantly exceeding that of polycrystals. The combined analysis of Shubnikov–de Haas (SdH) oscillations, Hall resistivity, and first-principles calculations suggest that SdH oscillations originate from trivial electron bands rather than hole bands, which contain an almost linear dispersion. We confirmed that the electron mobility reached 10 000 cm2/Vs by analyzing Hall resistivity and magnetoresistance based on a two-band model. The electron/hole concentration and mobility were used to investigate the measured transport properties, such as the Nernst coefficient. Overall, these results are critical for elucidating the electronic structure and transport properties of Mg3Bi2.

关键词： Hole concentration

来源：评论

学校读者我要写书评

暂无评论

engineering the mechanical properties of Ti3C2Tx MXene films via thermal annealing treatment

引用

Nano materials science 2025年

作者： Kamal, Abdallah Li, Baosong Luo, Shaohong Kinloch, Ian Zheng, Lianxi Liao, Kin Department of Mechanical and Nuclear Engineering Khalifa University of Science and Technology Abu Dhabi127788 United Arab Emirates Department of Aerospace Engineering Khalifa University of Science and Technology Abu Dhabi127788 United Arab Emirates Abu Dhabi127788 United Arab Emirates Department of Biomedical Engineering Khalifa University of Science and Technology Abu Dhabi127788 United Arab Emirates Herny Royce Institute National Graphene Institute and Department of Materials University of Manchester ManchesterM13 9PL United Kingdom

Films fabricated from two-dimensional (2D) materials introduce a distinct assembly structure that imparts the inherent properties of pristine 2D materials into a macroscopic scale. Freestanding Ti3C2Tx MXene films have a highly compacted structure of hierarchically assembled nanoflakes and are candidates for various applications. We experimentally investigated various factors impacting the mechanical properties of Ti3C2Tx MXene films for acquiring improved strength and toughness. To scrutinize the effect of the fabrication technique and the thickness of the Ti3C2Tx MXene films, vacuum-assisted filtration (VAF) and casting processes were utilized to fabricate Ti3C2Tx MXene films with varying thicknesses. Additionally, the influence of annealing temperature on the acquired Ti3C2Tx MXene films' mechanical properties, under various straining rates, was elucidated. The annealing temperature, ranging between room temperature (RT) and 300 °C, has a major impact on the obtained mechanical properties of Ti3C2Tx MXene films. For all strain rates, ranging between 10−1 min−1 and 10−5 min−1, the tensile strength of the film increases with an increase of temperature, to 200 °C. Annealing treatment at 200 °C improved the average tensile strength and Young's modulus by about 44.6 % and 35.1 %, respectively, for films made via VAF. Similarly, they increased by 32.8 % and 20 %, respectively, for films made via casting process. This behavior is independent of the fabrication technique and the thickness. However, thin Ti3C2Tx MXene films showed superior mechanical properties compared to thick films. Additionally, the mechanical properties of casted films were inferior to those fabricated via VAF process. The obtained deformation mechanism seems to be highly dependent on the structural features of the film and the characteristics of interlayer spacing between adjacent Ti3C2Tx MXene flakes. © 2025 Chongqing University

关键词： Tensile strength

来源：评论

学校读者我要写书评

暂无评论

Observation of mechanical kink control and generation via phonons

arXiv

引用

arXiv 2025年

作者： Qian, Kai Cheng, Nan Serafin, Francesco Sun, Kai Theocharis, Georgios Mao, Xiaoming Boechler, Nicholas Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla CA92093 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Physics and Materials Science University of Luxembourg 2 Avenue de l’Universite L Esch-sur-Alzette4365 Luxembourg CNRS Le Mans Université France Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States

Kinks (or domain walls) are localized transitions between distinct ground states associated with a topological invariant, and are central to many phenomena across physics, from condensed matter to cosmology. While phonon (i.e., small-amplitude vibration) wave packets have been theorized to deterministically interact with kinks and initiate their movement, this interaction has remained elusive in experiments, where only uncontrollable stochastic kink motion generated by thermal phonons or dislocation glide by low-frequency quasi-static loading have been observed. This is partly because all physical systems that support kinks are, at some level, discrete, making deterministic phonon control of kinks extremely challenging due to the existence of Peierls-Nabarro (PN) barrier. Here, we demonstrate, for the first time, experimental observation of phonon-mediated control and generation of mechanical kinks, which we enable using a topological metamaterial that constitutes an elastic realization of the Kane-Lubensky chain model. Our metamaterial overcomes the PN barrier by supporting a single, topologically protected kink that requires zero energy to form and move. Using simulations that show close agreement with our experimental observations, we also reveal unique dynamics of phonon interplay with highly discrete kinks, including long-duration motion and a continuous family of internal modes, features absent in other discrete nonlinear systems. This work introduces a new paradigm for topological kink control, with potential applications in material stiffness tuning, shape morphing, locomotion, and robust signal transmission. © 2025, CC BY-NC-ND.

关键词： Stochastic systems

来源：评论

学校读者我要写书评

暂无评论

mechanical properties of Portland cement concrete mixed with different doses of recycled brick powder and steel fiber

引用

Heliyon 2025年第2期11卷 e41900页

作者： Moein, Mohammad Mohtasham Moein, Ali Mohtasham Saradar, Ashkan Rigby, Sam E. Tazari, Hassan Karakouzian, Moses Department of Civil Engineering Allameh Mohaddes Nouri University Mazandaran Nour Iran School of Mechanical Engineering Iran University of Science and Technology Tehran Iran Department of Civil Engineering University of Guilan Rasht Iran School of Mechanical Aerospace and Civil Engineering University of Sheffield United Kingdom Faculty of Materials Science and Engineering K. N. Toosi University of Technology Tehran Iran Department of Civil and Environmental Engineering and Construction University of Nevada Las Vegas NV United States

This research investigates the mechanical properties of Portland Cement Concrete (PCC), incorporating recycled brick powder (RBP) and steel fibers and addressing sustainability and performance enhancement in concrete materials. The experimental design systematically varied RBP content (0–15 %) and incorporated crimped steel fibers of two lengths (20 and 50 mm) at dosages of 0 %, 0.5 %, and 1 %. The rationale for these percentages stems from balancing material recycling potential with maintaining concrete structural integrity, with RBP serving as a partial cement replacement to reduce environmental impact and material waste. Comprehensive testing encompassed compressive strength, flexural strength, tensile strength, and impact resistance. Due to the high variability of impact data, a two-parameter Weibull distribution was applied to provide a more robust statistical interpretation of the results. The findings revealed that 5 % RBP in plain concrete caused slight reductions in mechanical properties, with decreases of 1.48 % in compressive, 1.12 % in flexural, 1.42 % in tensile, 3.19 % in first crack, and 3.03 % in failure strengths. Steel fiber incorporation significantly enhanced the concrete's response to static and short-term dynamic loading. The combination of lengths (20-mm and 50-mm steel fibers) demonstrated the greatest impact resistance, offering potential applications in infrastructure elements requiring improved durability, such as bridge decks, industrial flooring, and earthquake-resistant structures. While steel fibers substantially improved fatigue resistance under repeated impact loading, the addition of RBP was observed to partially mitigate these benefits. The impact test data for all mixtures were effectively characterized by the two-parameter Weibull distribution, with R² values consistently exceeding 0.88, providing a reliable statistical framework for assessing concrete performance. The study contributes to sustainable construction prac

关键词： Construction and demolition wastes Impact strength mechanical properties Recycled brick powder Steel fiber reinforced concrete Weibull distribution

来源：评论

学校读者我要写书评

暂无评论

Synergetic integration of elastic constraint and linkages for enhancing vibration isolation

引用

International Journal of mechanical sciences 2025年 296卷

作者： Dai, Wei Xu, Weiye Wang, Lin Yang, Jian Li, Tianyun Zhu, Xiang Meng, Xueliang Ran, Liaoyuan School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan430074 China School of Aerospace Engineering Huazhong University of Science and Technology Wuhan430074 China Department of Mechanical Materials and Manufacturing Engineering University of Nottingham Ningbo China Ningbo315100 China School of Mechanical Engineering Sciences University of Surrey GuildfordGU2 7XH United Kingdom

This study proposes synergic use of elastic constraints and linkage mechanism in creating nonlinear vibration isolators to enhance their low-frequency isolation performance. The use of constraint overcomes the folding problem of linkages under large deflections and their hybrid use offers great performance benefits. The vibration-attenuation enhancement owing to the integration of nonlinear elements into a single-stage isolation system and an isolation system with a flexible foundation is investigated considering applications in marine or aerospace engineering. The harmonic-balance method (HBM) with an alternating frequency/time scheme and time-marching method are employed to calculate the responses. The performance of the proposed nonlinear isolator is experimentally validated. The vibration transmissibilities and power-transmission indices are used as measures of the isolation performance. The results show that the nonlinear isolator considerably decreases the power flow and vibration transmissibility to the base over a broad frequency range. The use of the elastic constraint enables a wider range of spring-linkage parameters in the design, and the proposed isolator can provide improved vibration-attenuation capabilities at low frequencies. With the integration of constraint and linkages, the peaks in the curves for the force transmission and power flow to the flexible foundation are significantly suppressed and shifted towards lower frequencies. A base-motion excitation experiment is conducted, and the results validate the effectiveness of the proposed nonlinear isolator, showing a lower resonant frequency and reduction in the peak displacement transmissibility. This study demonstrates that the proposed isolator design can be further applied to the isolation platform of onboard mechanical systems. © 2025

关键词： Marine applications

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：