检索结果-内蒙古大学图书馆

Meta Shack–Hartmannwavefront sensor with large sampling density and large angular field of view:phase imaging of complex objects

引用

Light(science & Applications) 2024年第9期13卷 1908-1918页

作者： Gi-Hyun Go Dong-gu Lee Jaeyeon Oh Gookho Song Doeon Lee Mooseok Jang Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea

Shack–Hartmann wavefront sensors measure the local slopes of an incoming wavefront based on the displacement of focal spots created by a lenslet array,serving as key components for adaptive optics for astronomical and biomedical ***,the challenges in increasing the density and the curvature of the lenslet have limited the use of such wavefront sensors in characterizing slowly varying wavefront ***,we develop a metasurfaceenhanced Shack–Hartmann wavefront sensor(meta SHWFS)to break this limit,considering the interplay between the lenslet parameters and the performance of *** experimentally validate the meta SHWFS with a sampling density of 5963 permm2 and a maximum acceptance angle of 8°which outperforms the traditional SFWFS by an order of ***,to the best of our knowledge,we demonstrate the first use of a wavefront sensing scheme in single-shot phase imaging of highly complex patterns,including biological tissue *** proposed approach opens up new opportunities in incorporating exceptional light manipulation capabilities of the metasurface platform in complex wavefront characterization.

关键词： angular curvature exceptional

来源：评论

学校读者我要写书评

暂无评论

Hyperreflective photonic crystals created by shearing colloidal dispersions at ultrahigh volume fraction

引用

Microsystems & Nanoengineering 2024年第1期10卷 161-173页

作者： Minji Kim Jong Bin Kim Shin-Hyun Kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

Colloidal crystallization serves as one of the most economic and scalable production methods for photonic ***,insufficient optical performance,nonuniformity and low reproducibility remain challenges for advanced high-value *** this study,we optimally formulate a photocurable dispersion of silica particles and apply shear flow to unify the orientation of the colloidal crystals,ensuring high optical performance and *** silica particles experience strong repulsion at ultrahigh volume fractions of 50%but demonstrate low mobility,leading to polycrystalline *** shear flow to the dispersions allows the silica particles to rearrange into larger crystalline domains with a unidirectional orientation along the *** shear-induced structural change produces absolute reflectivity at the stopband as high as 90%and a high transparency of 90%at off-resonant wavelengths with minimal diffusive ***,the strong interparticle repulsion ensures a uniform volume fraction of particles throughout the dispersion,reducing deviations in the optical *** intricately micropattern the photocurable dispersions using ***,the photonic films and patterns can be stacked to form multiple layers,displaying mixed structural colors and multiple reflectance peaks without sacrificing *** superior photonic materials hold promise for various optical applications,including optical components and anticounterfeiting patches.

关键词： properties. dispersion reflectivity

来源：评论

学校读者我要写书评

暂无评论

Control of Manufacturing Process of Soft Actuator Made of Magnetorheological Elastomer

引用

Journal of institute of Control, Robotics and Systems 2024年第4期30卷 428-437页

作者： Kim, Min Sung Park, Chan Young Lee, Doo Yong Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Korea Republic of

Microscale soft actuators can be used in medical catheters and guidewires for active steering, which can reduce the procedure time and the risk of infection in vascular interventions. Pressure-driven soft actuators have a simpler structure than other mechanisms because they have a single asymmetric shape and can be made of a single material. Pressure-driven soft actuators are, therefore, suitable for microscale miniaturization, and considerable research on applying pressure-driven soft actuators to medical micro-guidewires has been conducted. Closed and open molding have been proposed as methods for fabricating pressure-driven soft actuators. However, it is difficult to control the diameter and the degree of asymmetry of the produced actuators due to the effect of microbubbles and surface tension during the manufacturing process. This paper proposes a novel fabrication method to control the degree of asymmetry using the magnetic field and dip coating the magnetorheological elastomer. The diameter is controlled by adjusting the precuring time of MR-elastomer and the travel speed of the inner mold during manufacturing. The degree of asymmetry is controlled independently by controlling the current of the electromagnet. The manufacturing process and the parameters are modeled to control the outer diameter and the eccentricity of the resulting actuators. The manufacturing parameters are experimentally controlled to ensure consistency in the fabrication of the actuators. Specifically, the manufacturing system is controlled to produce actuators with a diameter of 0.7 mm and an eccentricity of 80 μm with errors of 1.7% and 3.75%, respectively. The fabricated microscale pressure-driven actuators can bend sharply up to 115° for a length of 5.41 mm. © ICROS 2024.

关键词： Catheters

来源：评论

学校读者我要写书评

暂无评论

Perception and Sensing Technologies for Maritime Autonomous Ships

引用

Journal of institute of Control, Robotics and Systems 2024年第4期30卷 383-393页

作者： Kim, Jonghwi Kim, Jinwhan Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Korea Republic of

Recent advancements in artificial intelligence and sensor technology have promoted increasing interest in maritime autonomous ships. In this paper, we present an overview of the perception and sensing technologies applied in autonomous ship research. We introduce various datasets collected using perception sensors, such as a camera, LiDAR, and marine radar. Object detection and semantic segmentation methods for detecting floating objects and navigable regions using individual sensors are presented. Additionally, sensor fusion methods that integrate data from multiple sensors to enhance detection and navigation capabilities are addressed. © ICROS 2024.

关键词： Ships

来源：评论

学校读者我要写书评

暂无评论

Fe-based high-entropy alloy with excellent mechanical properties enabled by nanosized precipitates and heterogeneous grain distribution

引用

Journal of Materials science & technology 2024年第14期181卷 71-81页

作者： Heechan Jung Sangwon Lee Taehyeok Kang Alireza Zargaran Pyuck-Pa Choi Seok Su Sohn Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Graduate Institute of Ferrous and Energy Materials Technology Pohang University of Science and TechnologyPohang 37673Republic of Korea

High-entropy alloys(HEAs)consisting of CoCrFeNiAlTi systems,with a face-centered cubic(FCC)matrix reinforced by ordered L12 precipitates,have demonstrated exceptional strength-ductility ***,the current compositional design of HEAs heavily relies on high Ni and Co contents,compro-mising the balance between properties and ***,it is crucial to optimize the cost-performance trade-offby fine-tuning the range of Fe,Co,and Ni,while maintaining excellent strength-ductility *** this study,we propose a novel Fe-based HEA with nanosized precipitates and a heteroge-neous grain distribution,achieving a strength-ductility combination comparable to state-of-the-art Ni-or Co-based *** alloy benefits from both precipitation hardening and hetero-deformation-induced strengthening attributed to the heterogeneous grain distribution,resulting in excellent yield strength of 1433 MPa,tensile strength of 1599 MPa,and ductility of 22%.The microstructural evolution and its in-fluence on mechanical properties are unraveled with respect to the observation of precipitate-dislocation interaction and hetero-deformation-induced stress(HDI stress)*** study suggests that the challenge of balancing properties and cost can be addressed through optimized compositional and mi-crostructural design.

关键词： High-entropy alloys Precipitation Heterogeneous microstructure Mechanical property HDI stress

来源：评论

学校读者我要写书评

暂无评论

Toward multicomponent mesoporous single-crystalline metal oxides

引用

National science Review 2024年第5期11卷 92-93页

作者： Minkyeong Ban Jinwoo Lee Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST)

Mesoporous metal oxide materials have attracted significant interest due to their porous frameworks and large surface areas, finding applications in sensors, catalysis and energy storage [1]. The performance of these ... 详细信息

关键词： single metal crystalline mesoporous multicomponent oxides toward

来源：评论

学校读者我要写书评

暂无评论

Enhancement of strength and ductile-brittle transition temperature of SA508 Gr.3 low-alloy steel by controlling heat accumulation in laser powder-directed energy deposition

引用

Journal of Materials science & technology 2024年第35期202卷 240-252页

作者： Wonjong Jeong Young-Bum Chun Suk Hoon Kang Chang Kyu Rhee Chang Hyoung Yoo Seongjin Yoo Hongmul Kim Muhammad Akmal Ho Jin Ryu Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and TechnologyYuseong-guDaejeon34141Republic of Korea Korea Atomic Energy Research Institute Yuseong-guDaejeon34057Republic of Korea Advanced powder technology team HANA AMTCheongwon-guCheongju-si28126Republic of Korea Department of Material Science and Engineering Korea Advanced Institute of Science and TechnologyYuseong-guDaejeon34141Republic of Korea

The safety and longevity of small modular reactors are affected by reactor pressure vessels,which are complex integral components made of SA508 Gr.3 low-alloy *** this study,the impacts of heat accumulation on the microstructural and mechanical characteristics(tensile properties and Charpy V-notched impact energy)of SA508 Gr.3 steel fabricated using laser powder-directed energy deposition were *** samples were prepared using long raster and short raster scanning strate-gies for changing heat buildup,and the mechanical tests were conducted depending on build *** time-temperature profile measured at a fixed point in the long raster sample showed a lower max-imum temperature and a higher cooling rate,indicating lower heat accumulation compared to that of the short raster *** each build direction,the yield strength of the long raster sample was 45.8%-60.5%higher and its ductile-brittle transition temperature was 76.8-103.8℃ lower than that of the short raster ***,compared to conventionally made samples and without requiring heat treat-ment,the long raster sample exhibited over a 45%increase in yield strength and a 22.7℃ reduction in the ductile-brittle transition *** superior combination in long raster samples is induced by smaller effective grain size,smaller cementite,and a higher pre-existing dislocation *** re-sults emphasize the importance of controlling heat accumulation throughout the additive manufacturing process and provide valuable insights into the use of additive manufacturing for manufacturing reactor pressure vessels in the nuclear industry.

关键词： Reactor pressure vessel Laser powder directed energy deposition SA508 Gr.3 Low-alloy steel Heat accumulation Ductile-brittle transition temperature

来源：评论

学校读者我要写书评

暂无评论

Chloride-Ion Blocking in Seawater Electrolysis:Narrating the Tale of Likes and Dislikes Between Anode and Ions

引用

Energy & Environmental Materials 2025年第1期8卷 255-272页

作者： Ashish Gaur Enkhtuvshin Enkhbayar Jatin Sharma Sungwook Mhin HyukSu Han Department of Energy Science Sungkyunkwan UniversitySuwon 16419Korea Institute of Nano Science and Technology Sector-81Knowledge CitySahibzada Ajit Singh NagarMohali 140306PunjabIndia Department of Advanced Materials Engineering Kyonggi UniversitySuwon 16227Korea

Seawater is the most abundant source of molecular *** the hydrogen reserves present in the seawater may inaugurate innovative strategies aimed at advancing sustainable energy and environmental preservation endeavors in the ***,there has been a surge in study in the field addressing the production of hydrogen through the electrochemical seawater ***,the performance and durability of the electrode have limitations due to the fact that there are a few challenges that need to be addressed in order to make the technology suitable for the industrial *** active site blockage caused by chloride ions that are prevalent in seawater and chloride corrosion is the most significant issue;it has a negative impact on both the activity and the durability of the anode *** this particular issue is of upmost importance in the seawater splitting *** review concentrates on the newly developed materials and techniques for inhibiting chloride ions by blocking the active sites,simultaneously preventing the chloride *** is anticipated that the concept will be advantageous for a large audience and will inspire researchers to study on this particular area of concern.

关键词： chloride ion blocking electrocatalysis Lewis acid oxygen evolution reaction seawater electrolysis

来源：评论

学校读者我要写书评

暂无评论

Giant anisotropy of magnetic damping in an epitaxial Cr/Fe bilayer with the absence of magnetocrystalline anisotropy

引用

Physical Review Materials 2024年第4期8卷 L041401-L041401页

作者： Thanh-Huong Thi Nguyen Jungmin Park Jae-Hyun Ha Soogil Lee Van Quang Nguyen Nyun Jong Lee Byong-Guk Park Sunglae Cho Jung-Il Hong Sanghoon Kim Department of Physics and Chemistry Daegu Gyeongbuk Institute of Science and Technology Daegu 42988 Korea Department of Physics Korea Advanced Institute of Science and Technology Daejeon 34141 Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Korea Korea Atomic Energy Research Institute Daejeon 34057 Korea Department of Physics University of Ulsan Ulsan 44610 Korea

Magnetic damping is one of the most important parameters governing the critical current density for current-induced magnetization switching in spin-torque devices. The anisotropic nature of magnetic damping, influenced by both intrinsic and extrinsic factors, has been demonstrated in both theoretical and experimental studies. Nevertheless, understanding the underlying mechanisms of magnetic damping anisotropy, particularly in the bilayer structure of a ferromagnet and a nonmagnetic metal, remains an open challenge. In this study, we investigate the crystallographic dependence of magnetic damping in an epitaxial Cr/Fe bilayer, which has negligible magnetocrystalline anisotropy. We experimentally extracted the total damping by conducting frequency-dependent ferromagnetic resonance measurement at different in-plane angles. The observed damping reveals a strong angular dependence with an anisotropy of ∼400% in the bilayer. All possible contributions to the total damping will be discussed carefully to clarify the origin of the profound damping anisotropy observed in our Cr/Fe bilayer.

关键词： Magnetotransport Magnons Spin dynamics

来源：评论

学校读者我要写书评

暂无评论

Analytic modeling and validation of strain in textile-based OLEDs for advanced textile display technologies

引用

npj Flexible Electronics 2024年第1期8卷 143-156页

作者： Junwoo Lee Chang-Yeon Gu Jaehyeock Chang Eun Hae Cho Taek-Soo Kim Kyung Cheol Choi School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea

In the IoT era,the demand for wearable displays is rapidly growing,catalyzing the advancement of research into textile-based organic light-emitting diodes(OLEDs).This growing interest stems particularly from the inherent flexibility of textile-based OLEDs^(1,2),allowing for seamless integration into the dynamic and interactive functionalities of cutting-edge wearable technology,alongside their superior electrical *** durability and mechanical robustness of these displays,especially under physical stress and deformation,are critical to their practical application and ***,understanding and enhancing the mechanical properties of textile-based OLEDs is paramount for their successful integration into wearable ***,many studies assessing the mechanical properties of OLEDs have predominantly relied on simplistic bending test outcomes determined by the radius,often neglecting or insufficiently analyzing the strain exerted on the OLEDs atop textile substrates in relation to curvature of these *** analyses typically presume pure bending,though such an assumption leads to considerable errors in strain estimations,making such approaches problematic if the goal is practical application in actual wearable display *** address these limitations,an analytic model that includes a comprehensive energy equation is introduced,considering the stretching energy,bending energy,and shear energy of each layer composing the textile *** holistic approach provides a novel formula specifically designed to calculate the top surface strain of textile *** validation of this formula is conducted by comparing its results with strain measurements obtained from digital image correlation(DIC)and finite element analysis(FEA)outcomes from ANSYS across various bending radii(or equivalently,curvatures).The close alignment of the calculated strain values with those derived from DIC and FEA not only underscores the precision

关键词： OLEDs strain bending

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：