检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Owsiński, Robert Miozga, Rafael Lagoda, Agnieszka Kurek, Marta Department of Mechanics and Machine Design Faculty of Mechanical Engineering Opole University of Technology Poland Science and Technology Park in Opole 2 Street Technologiczna United Kingdom Department of Manufacturing and Materials Engineering Faculty of Mechanical Engineering Opole University of Technology Poland

The article's subject is to analyze the influence of the print orientation using the DLMS method on the strength of the tested material before and after heat treatment. The heat treatment consisted of heating to the temperature of 490˚C and then cooling with the furnace for four hours. The maraging steel MS1 was selected for the experiment research. The test results analysis showed an increase in strength value after applying heat treatment. A numerical study of the mechanical characteristics of MS1 tool steel made by 3D printing was conducted. Fractographic analysis of the breakthrough of the specimens was carried out, and the results were compared. © 2024, The Authors. All rights reserved.

关键词： Maraging steel

来源：评论

学校读者我要写书评

暂无评论

Strain-driven control of spin-splitting parameters in the persistent spin helix state of monolayer XO2Y2(X=W, Mo;Y=Cl, Br, I)

引用

Physical Review B 2025年第7期111卷 075164-075164页

作者： Siti Amalia Harutaka Saito Katsuhiro Suzuki Kazunori Sato Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan Department of Mechanical Engineering National Institute of Technology Niihama College 7-1 Yagumocho Niihama Ehime 792-0805 Japan

The realization of spin field-effect transistors requires robust spin-orbit splitting and coherent spin precession in the presence of ferroelectric polarization, which can be observed in two-dimensional noncentrosymmetric systems. To control the spin-orbit coupling (SOC) parameters, we adopted strain engineering. Within the framework of the density functional theory, we investigated the electronic structure, spontaneous electric polarization, and spin texture of XO2Y2 (X=W, Mo; Y=Cl, Br, I) monolayer under uniaxial strain from −1% to 5%. We obtained tunable spin splitting in the conduction band minimum of all the monolayers. Among them, WO2Cl2 monolayer shows considerable SOC strength reaching up to 2.16 eV Å, allowing the device to function at room temperature. We also found that the spontaneous electric polarization is substantially influenced by the applied strain, which is increased from 156.2 pC/m to 255.3 pC/m. Additionally, we highlight the emergence of a reversible persistent spin helix (PSH) across all the compounds, maintained across strained variants. For practical applications, we confirm the fully reversed PSH under external electric −0.8 V/nm. The highly tunable spontaneous electric polarization and the SOC strength as well as the emergence and reversibility of the PSH state in XO2Y2 (X=W, Mo; Y=Cl, Br, I) monolayer underscore the potential for the application to the spin diffusion channel in spin-field effect transistors.

关键词： Monolayers

来源：评论

学校读者我要写书评

暂无评论

Nanoarchitectonics of point-of-care diagnostics for sweat biomarkers analysis

引用

Nano materials science 2024年第6期6卷 647-671页

作者： Xuan Lin Arya Vasanth Aditya Ashok Hoang-Phuong Phan Kevin M.Koo Mohammed A.Amin Yusuf Valentino Kaneti Carlos Salomon Md Shahriar A.Hossain Yusuke Yamauchi Mostafa Kamal Masud School of Chemistry and Molecular Biosciences The University of QueenslandBrisbaneQLD4072Australia Australian Institute of Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD4076Australia Graduate School of Biomedical Engineering The University of New South WalesSydneyNSW2052Australia The University of Queensland Centre for Clinical Research(UQCCR) HerstonQueensland4029Australia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Translational Extracellular Vesicles in Obstetrics and Gynae-Oncology Group University of Queensland Centre for Clinical ResearchFaculty of MedicineThe University of QueenslandBrisbaneQLD 4029Australia School of Mechanical and Mining Engineering Faculty of EngineeringArchitecture and Information Technology(EAIT)The University of QueenslandBrisbaneQLD4072Australia Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoyaAichi464-8603Japan Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722South Korea

Sweat contains numerous vital biomarkers such as metabolites,electrolytes,proteins,nucleic acids and antigens that reflect hydration status,exhaustion,nutrition,and physiological *** healthcare diagnosis relies on disease diagnostics in sophisticated centralized laboratories with invasive sample collection(e.g.,chemical analyses,plasma separation via centrifugation,tissue biopsy,etc.).Cutting-edge point-of-care diagnostics for sweat biomarker analysis allow for non-invasive monitoring of physiologically related biomarkers in sweat and real-time health status ***,using advanced nanoarchitectures,including nanostructured platforms and nanoparticles,can enhance the specificity,sensitivity,wearability and widen the sensing modality of sweat ***,we comprehensively review the secretory mechanisms,clinical uses of sweat biomarkers,and the design,principle,and latest technologies of sweat *** an emphasis on cutting-edge technologies for sweat biomarker analysis,this review chronicles the issues associated with the current sweat biomarkers analysis of sweat biomarkers and provides insights into strategies for enhancing the translation of such biosensors into routine clinical practice.

关键词： Sweat biomarker Nanoarchitectonics Nanostructures Sweat biosensor Point-of-care diagnostics Wearable sweat sensor

来源：评论

学校读者我要写书评

暂无评论

GHz-speed wavefront shaping metasurface modulators enabled by resonant electro-optic nanoantennas

arXiv

引用

arXiv 2025年

作者： Dagli, Sahil Shim, Jiyong Delgado, Hamish Carr Balch, Halleh B. Abdollahramezani, Sajjad Chen, Chih-Yi Dolia, Varun Klopfer, Elissa Dixon, Jefferson Hu, Jack Ogunlade, Babatunde Song, Jung-Hwan Brongersma, Mark L. Barton, David Dionne, Jennifer A. Department of Materials Science and Engineering Stanford University StanfordCA United States Department of Mechanical Engineering Stanford University StanfordCA United States Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Geballe Laboratory for Advanced Materials Stanford University StanfordCA United States Department of Materials Science and Engineering Northwestern University EvanstonIL United States

Electrically tunable metasurfaces that control the amplitude and phase of light through biasing of nanoscale antennas present a route to compact, sub-micron thick modulator devices. However, most platforms face limitations in bandwidth, absolute optical efficiency, and tuning response. Here, we present electro-optically tunable metasurfaces capable of both GHz amplitude modulation and transmissive wavefront shaping in the telecom range. Our resonant electro-optic nanoantenna design consists of a silicon nanobar atop thin-film lithium niobate, with gold electrodes. The silicon nanobar is a periodically perturbed optical waveguide that supports high quality factor (Q > 1000) guided mode resonances excited with free space light. Applying a voltage bias to the lithium niobate tunes its refractive index, modulating the resonant behavior of the silicon nanobar through evanescent mode overlap. We demonstrate an absolute transmittance modulation of 7.1% with ±5 V applied voltage, and show the dependence of this modulation behavior on the resonance quality factor. We additionally study the electrode limitations on modulation bandwidth, demonstrating bandwidths exceeding 800 MHz. Finally, we show how this resonant antenna platform can be used to design wavefront shaping metasurfaces. We demonstrate a beamsplitting metasurface device, whose diffraction efficiency can be modulated with a bandwidth of 1.03 GHz. The high-speed modulation and wavefront control capabilities of this platform provide a foundation for compact, high bandwidth free space communications and sensing devices. © 2025, CC BY.

关键词： Light modulation

来源：评论

学校读者我要写书评

暂无评论

Non-radical activation of persulfate with Bi_(2)O_(3)/BiO_(1.3)I_(0.4)for efficient degradation of propranolol under visible light

引用

Journal of Environmental sciences 2024年第8期142卷 57-68页

作者： Yuehua Deng Qianqian Che Yani Li Jiating Luo Xiang Gao Yan He Yiling Liu Tong Liu Xiaolong Zhao Xiaobin Hu Wei Zhao College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation Xi’an 710054China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Life Science Huzhou UniversityHuzhou 313000China School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China

Non-radical activation of persulfate(PS)by photocatalysts is an effective approach for removing organic pollutants from aqueous *** this study,a novel Bi_(2)O_(3)/BiO_(1.3)I_(0.4)heterojunction was synthesized using a facile solvothermal approach and used for the first time for non-radical activation of PS to degrade propranolol(PRO)in the presence of visible *** findings found that the degradation rate of PRO in the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)/PS system was significantly increased from 19%to more than 90%within 90 min compared to the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)*** indicated that the composite system exerted an excellent synergistic effect between the photocatalyst and the persulfate-based *** tests and electron paramagnetic resonance demonstrated that the non-radical pathway with singlet oxygen as the active species played a major role in the photocatalytic *** existence of photo-generated holes during the reaction could also be directly involved in the oxidation of ***,a possible PRO degradation pathway was also ***,the impacts of pH,humic acid and common anions on the PRO degradation by the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)/PS were explored,and the system’s stability and reusability were also *** study exhibits a highly productive catalyst for PS activation via a non-radical pathway and provides a new idea for the degradation of PRO.

关键词： Iodine deficiency Heterojunction Persulfate(PS) Propranolol(PRO) Photocatalytic degradation

来源：评论

学校读者我要写书评

暂无评论

Effects of residual stress on the isothermal tensile behavior of nanocrystalline superelastic NiTi shape memory alloy

arXiv

引用

arXiv 2024年

作者： Yan, Kai Wei, Pengbo He, Weifeng Sun, Qingping Department of Materials Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong State Key Laboratory for Manufacturing Systems Engineering School of Mechanical Engineering Xi’an Jiaotong University Xi’an710049 China Science and Technology on Plasma Dynamics Laboratory Air Force Engineering University Xi’an710038 China

The residual stress greatly affects the mechanical behavior of a material. In this work, the effect of residual stress on the isothermal tensile behavior of a NiTi shape memory alloy is studied. The focused ion beam and digital image correlation are combined to measure the two-dimensional residual stress in nanocrystalline NiTi plates processed with prestrain laser shock peening. A four-point bending experiment verified the accuracy of this measurement method. The FIB-DIC method is an attractive tool for measuring the two-dimensional residual stress in phase transition nanocrystalline materials. The internal residual stress significantly decreases the phase transition stress, and the mechanism is studied via finite element and theoretical analyses. This work implies that the mechanical behavior of NiTi shape memory alloys can be tailored via residual stress engineering. Copyright © 2024, The Authors. All rights reserved.

关键词： Nanocrystals

来源：评论

学校读者我要写书评

暂无评论

Characterizing catalyst function and transformations in the plasma reduction of CO₂ on atomic layer deposition-synthesized catalysts

RSC Applied Interfaces

引用

RSC Applied Interfaces 2024年第3期1卷 552-563页

作者： Conlin, Samuel K. Mehrabi, Hamed Parette, David N. Nichols, Eva M. Coridan, Robert H. Department of Chemistry and Biochemistry University of Arkansas Fayetteville 72701 AR United States Materials Science and Engineering Program University of Arkansas Fayetteville 72701 AR United States Department of Chemistry University of British Columbia Vancouver V6T 1Z1 BC Canada

The enhancement of CO2 reduction in atmospheric-pressure, non-thermal plasma has been shown using a variety of catalyst systems with ranging composition, particle sizes, and morphologies. Improvements in CO2 conversio...

The enhancement of CO₂ reduction in atmospheric-pressure, non-thermal plasma has been shown using a variety of catalyst systems with ranging composition, particle sizes, and morphologies. Improvements in CO₂ conversion can be attained by choice of catalyst material. However, inhomogeneity in the material distribution arising from the synthesis affects the catalytically active surface area and dielectric environment that modulates the plasma properties near the catalyst. Atomic layer deposition (ALD) can be used to control the composition of ultra-thin layers on support materials. We used ALD to synthesize metal oxide catalyst coatings on high surface area supports. We found that TiO₂ achieved significantly higher yields of CO₂ conversion (to CO and O₂) at low reactor power compared to ZnO or Al₂O₃, materials commonly used as a support for other catalysts. We also observed an unexpected increase in the catalytic activity on ZnO with increasing power. The results here suggest that ALD can unambiguously isolate the catalytic effects of materials in plasma reactors. © 2024 RSC.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A stochastic MPEC approach for grid tariff design with demand-side flexibility

引用

ENERGY SYSTEMS-OPTIMIZATION MODELING SIMULATION AND ECONOMIC ASPECTS 2023年第3期14卷 707-729页

作者： Askeland, Magnus Burandt, Thorsten Gabriel, Steven A. Energy Systems SINTEF Energy Research Trondheim Norway Department of Electric Power Engineering Norwegian University of Science and Technology Trondheim Norway Workgroup for Infrastructure Policy Technical University of Berlin Berlin Germany The Energy Transportation Environment Department German Institute for Economic Research (DIW Berlin) Berlin Germany Department of Industrial Economics and Technology Management Norwegian University of Science and Technology Trondheim Norway Department of Mechanical Engineering Applied Math and Statistics Scientific Computation Program University of Maryland College Park MD USA

As the end-users increasingly can provide flexibility to the power system, it is important to consider how this flexibility can be activated as a resource for the grid. Electricity network tariffs is one option that can be used to activate this flexibility. Therefore, by designing efficient grid tariffs, it might be possible to reduce the total costs in the power system by incentivizing a change in consumption patterns. This paper provides a methodology for optimal grid tariff design under decentralized decision-making and uncertainty in demand, power prices, and renewable generation. A bilevel model is formulated to adequately describe the interaction between the end-users and a distribution system operator. In addition, a centralized decision-making model is provided for benchmarking purposes. The bilevel model is reformulated as a mixed-integer linear problem solvable by branch-and-cut techniques. Results based on both deterministic and stochastic settings are presented and discussed. The findings suggest how electricity grid tariffs should be designed to provide an efficient price signal for reducing aggregate network peaks.

关键词： Bilevel problem Grid tariffs Mathematical program with equilibrium constraints (MPEC) Uncertainty

来源：评论

学校读者我要写书评

暂无评论

Green Synthesis of Hierarchical Ag Nanostructures for Sers Detection of Rhodamine Dye

SSRN

引用

SSRN 2024年

作者： Sayson, Luce Vida A. Taaca, Kathrina Lois M. Madera, Rozen Grace B. Vasquez, Magdaleno R. Regulacio, Michelle D. Materials Science and Engineering Program College of Science University of the Philippines Diliman Quezon City1101 Philippines Department of Mining Metallurgical and Materials Engineering College of Engineering University of the Philippines Diliman Quezon City1101 Philippines Institute of Chemistry College of Science University of the Philippines Diliman Quezon City1101 Philippines

This study presents a simple benchtop synthetic protocol for the fabrication of silver (Ag) nanostructures in aqueous media using environmentally friendly and inexpensive reagents under mild experimental conditions. Natural organic acids that are known to be present in plants were employed as reducing and morphology-directing reagents. SEM and TEM imaging revealed that the resultant nanostructures are three-dimensional hierarchical structures that were formed from self-assembly of smaller nanoparticles. They are generally spherical in shape and possess highly roughened surfaces due to the interstitial gaps between their nanoparticle subunits. Their hierarchical architecture allows for strong absorption of light in a broad range of wavelengths that extends to the near-infrared region. In addition, their surface morphology has an abundance of hot spot regions, which are capable of inducing strong SERS enhancement effects. The green-synthesized Ag nanostructures showed remarkable SERS activity when used as substrates for the detection of rhodamine 6G dye, a highly toxic water contaminant. Overall, this study does not only provide a greener approach to hierarchical Ag nanostructures, but also demonstrates theimmense potential of these nanostructures in the sensitive detection of organic dyepollutants. © 2024, The Authors. All rights reserved.

关键词： Substrates

来源：评论

学校读者我要写书评

暂无评论

Micromechanical origin of heat transfer to granular flow

引用

Physical Review E 2024年第4期109卷 L042902-L042902页

作者： Xintong Zhang Sarath Adapa Tianshi Feng Jian Zeng Ka Man Chung Clifford Ho Kevin Albrecht Renkun Chen Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 USA Program in Materials Science and Engineering University of California San Diego La Jolla California 92093 USA Concentrating Solar Technologies Department Sandia National Laboratories 1515 Eubank Boulevard SE Albuquerque New Mexico 87123 USA

Heat transfer across a granular flow is comprised of two resistances in series : near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contribution. Here, we use a frequency modulated photothermal technique to separately quantify the thermal resistances in the near-wall and the bulk bed regions of particles in flowing states. Compared to the stationary state, the flowing leads to a higher near-wall resistance and a lower thermal conductivity of bulk beds. Coupled with discrete element method simulation, we show that the near-wall resistance can be explained by particle diffusion in granular flows.

关键词： Fluidized beds Granular flows Granular materials Granular packing Interparticle interactions

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：