检索结果-内蒙古大学图书馆

38th IMAC, A Conference and Exposition on Structural Dynamics, 2020

作者： Koller, Lukas Witteveen, Wolfgang Pichler, Florian Study Program "Mechanical Engineering" University of Applied Sciences Upper Austria Wels Austria

ISBN: (纸本)9783030476250

The determination of nonlinear state-dependent surface loads, acting on finite element (FE) structures, represents a computationally challenging and costly task in dynamic simulations. While for time integration an enormous reduction of the FE models number of degrees of freedom (DOFs) can be achieved by subspace projection, the computation of nonlinear surface loads usually depends on the non-reduced physical DOFs. In order to overcome this issue, so-called Hyper-Reduction (HR) methods have been introduced. These methods try to compute the surface loads in a reduced subspace as well. In this publication, an intermediate approach is proposed, which is called "Semi Hyper-Reduction" (SHR). The equations for computing the surface loads are built up in the full space and then projected into a lower dimensional subspace via proper force trial vectors. The required force trial vectors, called "stress modes", thereby can be determined a priori without any nonlinear computations using the full DOF model. As a numerical example, a 3D crank drive is used, where the piston and the cylinder are separated by a hydrodynamic lubrication film, which is considered by Reynolds equation. © The Society for Experimental Mechanics, Inc 2021.

关键词： Vectors

来源：评论

学校读者我要写书评

暂无评论

Framework for time-varying DoA estimation and beamforming against radio jamming in V2X applications

Framework for time-varying DoA estimation and beamforming ag...

引用

International Conference on Transparent Optical Networks

作者： Daniel V. De Lima Antonio S. Da Silva João Paulo J. Da Costa Giovanni A. Santos Kira Kastell Auzuir R. De Alexandria Melissa B. Da Conceição Postgraduate Program in Telecommunications Engineering (PPGET) IFCE Fortaleza Brazil Hamm-Lippstadt University of Applied Sciences (HSHL) Hamm Germany

ISBN: (数字)9798350377323

ISBN: (纸本)9798350377330

Smart mobility is a crucial aspect of smart cities, and its performance can be further improved by exploiting Vehicle-to-Everything (V2X) communication available on Advanced Driver Assistance Systems (ADAS) and autonomous vehicles. V2X communication has the potential to improve traffic in smart cities drastically, but it plays a crucial role in terms of safety and the environment. The V2X communication can be completely impaired due to cyberattacks, including radio jamming, where the electromagnetic spectrum is interfered or blocked. In this paper, we propose three frameworks to deal with radio jamming in V2X applications. First, we present a batch framework, then a recursive framework, and finally, a subspace tracking framework. We validate the proposed frameworks considering the left turn assist driving use case, and we compare their performances.

关键词： Electric potential Direction-of-arrival estimation Smart cities Prevention and mitigation Estimation Optical fiber networks Safety

来源：评论

学校读者我要写书评

暂无评论

New insights into the hardening and pitting corrosion mechanisms of thermally aged duplex stainless steel at 475℃:A comparative study between 2205 and 2101 steels

引用

Journal of Materials Science & Technology 2022年第3期98卷 123-135页

作者： R.Silva G.S.Vacchi C.L.Kugelmeier I.G.R.Santos A.A.Mendes Filho D.C.C.Magalhães C.R.M.Afonso V.L.Sordi C.A.D.Rovere Munir Rachid Corrosion Laboratory Department of Materials EngineeringFederal University of São CarlosRodovia Washington Luis Km 23513565-905 São CarlosSPBrazil Engineering Modeling and Applied Social Sciences Center(CECS)Federal University of ABCAvenida dos Estados 500109210580 Santo AndréSPBrazil Federal University of São Carlos Graduate Program in Materials Science and EngineeringBrazil

In this study,the relationship between spinodal decomposition and the formation of Ni-rich clusters and G-phase in the ferrite on hardening and pitting corrosion of two thermally aged duplex stainless steels(DSSs)at 475℃was *** indicate that,for 2205 DSS,pitting corrosion behavior is influenced by the presence and size of G-phase precipitates for longer aging times,but this contribution is masked by the advanced stage of spinodal decomposition in the ferritic *** the other hand,for 2101 DSS,the formation of Cr-richer nitrides impairs pitting corrosion resistance more than spinodal decomposition.

关键词： Duplex stainless steel Spinodal decomposition G-phase precipitation Pitting corrosion Hardening

来源：评论

学校读者我要写书评

暂无评论

Role of Computational Intelligence Techniques in Diagnosing Alzheimer's disease at Early Stages: A Systematic Literature Review

Role of Computational Intelligence Techniques in Diagnosing ...

引用

2022 International Conference on Electronics and Renewable Systems, ICEARS 2022

作者： Senthil Kumar, S. Ranga Swamy, K. School of Engineering Presidency University Program Head Cse Department of Cse Kolkata India Anantha Lakshmi Institute of Technology Sciences Department of Cse Anantapur India

ISBN: (纸本)9781665484251

Computer aided disease diagnosis with computational intelligence research has shown that several intelligent models have been developed to assess medical data and make assumptions about illness severity and early diagnosis. Many researchers find it difficult to anticipate and diagnose the deadly neurodegenerative disorders that fall under the category of dementia using medical image data. Alzhiemers is now the most common dementia, affecting around a third of all people. Many machine learning models have been developed, but there is still a lot of room for further improvement in the field of Alzheimer's disease detection and prevention. This article includes a thorough literature evaluation of machine learning approaches that have been developed to detect Alzheimer's disease at an earlier stage. As a result of these studies, budding Alzheimer's disease researchers will be able to better understand the extent of study in forecasting the illness via the use of artificial neural networks, support vector machines, and deep learning-based ensemble models. © 2022 IEEE.

关键词： Soft computing

来源：评论

学校读者我要写书评

暂无评论

Conversion of biochar into sulfonate-bearing solid acids used for the hydrolysis of tylosin:the effect of aromaticity and degree of condensation

引用

Biochar 2023年第1期5卷 1514-1526页

作者： Qianqian Xie Xiao Yang Binoy Sarkar Xiaomin Dou Piumi Amasha Withana Yong Sik Ok College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083People’s Republic of China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China Future Industries Institute University of South AustraliaMawson LakesSA 5095Australia Korea Biochar Research Center APRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoul 02841Republic of Korea International ESG Association(IESGA) Seoul 06621Republic of Korea

In the last few decades,sulfonated carbon materials have garnered significant attention as Brøsted solid acid *** sulfonation process and catalytic activity of sulfonated biochar can be influenced by the aromaticity and degree of condensation exhibited by ***,the relationships between the aromaticity,sulfonating ability,and resultant catalytic activity are not fully *** this study,biochar samples pyrolyzed at 300-650℃ exhibiting different aromaticity and degrees of condensation were sulfonated and employed as sulfonate-bearing solid catalysts for hydrolytically removing *** exhibited excellent hydrolytic performance and their kinetic constants were positively correlated with the total acidity and negatively correlated with their *** study has uncovered the relationship between the structure,properties,sulfonating ability,and subsequent hydrolytic performance of biochar *** was observed that the aromaticity of biochar decreased as the pyrolysis temperature *** pyrolysis temperatures resulted in a reduced degree of condensation,smaller ring size,and an increased number of ring edge sites available for sulfonation,ultimately leading to enhanced catalytic *** findings provide valuable insights into the fundamental chemistry behind sulfonation upgrading of biochar,with the aim of developing functional catalysts for mitigating antibiotics in contaminated water.

关键词： Biochar upgrading Sulfonation Hydrolytic mitigation Tylosin removal Biochar-based solid acids

来源：评论

学校读者我要写书评

暂无评论

A critical review of the interactions between rhizosphere and biochar during the remediation of metal(loid)contaminated soils

引用

Biochar 2023年第1期5卷 1481-1513页

作者： Chuanfang Fan Yanshan Cui Qianru Zhang Naiyi Yin Xiaolin Cai Xiangzhou Yuan Sachini Senadheera Yoora Cho Yong Sik Ok College of Resources and Environment University of Chinese Academy of SciencesBeijing 101408China Research Center for Eco-Environment Sciences Chinese Academy of SciencesBeijing 100085China Korea Biochar Research Center APRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoul 02841Republic of Korea State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Biochar has a large specific surface area,well-developed pore structure,abundant surface functional groups,and superior nutrient supply capacity,which is widely available and environmentally friendly with its advantages in waste resource utilization,heavy metal(loid)remediation,and carbon *** review focuses on the interactions between biochar(including raw biochar,functional biochar(modified/engineered/designer biochar),and composite biochar)and rhizosphere during the remediation of soil contaminated with heavy metal(loid)s(Pb,As,Cd,Hg,Co,Cu,Ni,Zn,Cr,etc.)and the effects of these interactions on the microbial communities and root exudates(enzymes and low-molecular-weight organic acids(LMWOAs)).In terms of microorganisms,biochar affects the composition,diversity,and structure of microbial communities through the supply of nutrients,provision of microbial colonization sites,immobilization of heavy metal(loid)s,and introduction of exogenous *** regard to root exudates,biochar provides electron transfer support between the microorganisms and exudates,regulates the secretion of enzymes to resist the oxidative stress stimulated by heavy metal(loid)s,ameliorates rhizosphere acidification caused by LMWOAs,and promotes the activity of soil *** roles and mechanisms of biochar on rhizosphere soils are discussed,as well as the challenges of biochar in the remediation of heavy metal(loid)-contaminated soils,and the issues that need to be addressed in future research are foreseen.

关键词： Green and sustainable remediation Sustainability Biochar Soil Root Heavy metal(loid)s

来源：评论

学校读者我要写书评

暂无评论

Retinal oxygen extraction during systemic hypoxia assessed with laser-speckle flowgraphy and retinal oximetry

引用

ACTA OPHTHALMOLOGICA 2025年第S284期103卷

作者： Pai, Viktoria Lindner, Theresa Janku, Patrick Schmetterer, Leopold Schmidl, Doreen Garhofer, Gerhard Department of Clinical Pharmacology Medical University of Vienna Vienna Austria Singapore National Eye Centre Singapore Eye Research Institute Singapore Singapore Duke-NUS Medical School Ophthalmology and Visual Sciences Academic Clinical Program Singapore Singapore SERI-NTU Advanced Ocular Engineering (STANCE) Nanyang Technological University Singapore Singapore Center for Medical Physics and Biomedical Engineering Medical University of Vienna Vienna Austria Institute of Molecular and Clinical Ophthalmology Basel Switzerland School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore Singapore

Aims/Purpose: Retinal oxygen extraction has been found to be altered in several ocular and systemic diseases, such as diabetic retinopathy, glaucoma or neurodegenerative diseases. However, measurement techniques for the assessment of retinal oxygen extraction are limited because most of them are based on time-consuming and custom-built devices. In the present pilot study, we assessed retinal oxygen extraction during systemic hypoxia with a combination of two commercially available devices: Laser-Speckle Flowgraphy (LSFG) and retinal oximetry. Methods: Retinal blood flow and retinal oxygen saturation were measured in each vessel around the optic nerve head at the same position. Arterial and venous oxygen content was estimated from the measured retinal oxygen saturation parameters and the difference between these two parameters was calculated (cO 2 , DIFF ). By using mean vessel flow rate (MV) for retinal blood flow and cO 2 , DIFF , retinal oxygen extraction was determined. For each healthy study participant, baseline measurement and measurement during inhalation of 88% nitrogen in 12% oxygen were performed. Results: Ten (10) healthy subjects (4 females, 6 males) with a mean age of 27 ± 3 years were included in this study. During systemic hypoxia, a significant decrease in arterial oxygen content occurred ( p = 0.046) while venous oxygen content did not change, leading to a decrease in cO 2 , DIFF . As expected, this was accompanied by a significant increase in MV ( p = 0.014). No change in retinal oxygen extraction was observed (46 ± 8 a.u. at baseline vs. 46 ± 5 a.u. during hypoxia, p = 0.997). Conclusions: Breathing of 88% nitrogen in 12% oxygen caused a significant decrease in retinal arterial oxygen content. This was compensated by an increase in retinal blood flow in order to keep retinal oxygen extraction constant. This was physiologically expected, and these findings are consistent with the literature. Therefore, the presented approach for measurement of reti

关键词：

来源：评论

学校读者我要写书评

暂无评论

A dimension reduction procedure for the design of lattice-spring systems with minimal fabrication cost and required multi-functional properties

arXiv

引用

arXiv 2025年

作者： Makarenkov, Egor Malhotra, Sakshi Jiao, Yang Allen High School TX United States Mathematical Sciences University of Texas at Dallas TX United States Material Sciences and Engineering Program School for Engineering of Matter Transport and Energy Arizona State University AZ United States

We show that the problem of the design of the lattices of elastoplastic current conducting springs with optimal multi-functional properties leads to an analytically tractable problem. Specifically, focusing on a lattice with a small number of springs, we use the technique of inequalities to reduce the number variables and to compute the minimal cost of lattice fabrication *** Codes 26D05, 49Q10, 70K42 Copyright © 2025, The Authors. All rights reserved.

关键词： Elastoplasticity

来源：评论

学校读者我要写书评

暂无评论

Mxene/Polydimethylsiloxane (PDMS) Based Implantable and Flexible Bioelectrodes for Neural Sensing

Mxene/Polydimethylsiloxane (PDMS) Based Implantable and Flex...

引用

2023 Advances in Science and engineering Technology International Conferences, ASET 2023

作者： Baz Khan, Kashif Rast Al-Othman, Amani Al-Nashash, Hasan Al-Sayah, Mohammad American University of Sharjah Biomedical Engineering Graduate Program Sharjah United Arab Emirates American University of Sharjah Department of Chemical and Biological Engineering Sharjah United Arab Emirates American University of Sharjah Department of Electrical Engineering Sharjah United Arab Emirates American University of Sharjah Chemistry and Environmental Sciences Sharjah United Arab Emirates

ISBN: (纸本)9781665454742

Research applications of neural sensing and muscle stimulation have been advanced by the development of bioelectrodes that are biocompatible, flexible and long lasting. The existing metallic made bioelectrodes exhibit extremely high electrochemical resistances that would interfere with the neural-electrode bridge and suffer from mechanical and immunological mismatch. Novel, flexible, implantable bioelectrodes based on MXenes (Ti3C2) and Polydimethylsiloxane (PDMS) composite are proposed. Mxenes possess the advantage of having metallic ultra-conductive transition metals consisting of large groups of carbides, nitrides, or carbonitrides, while PDMS has inherent biostability, flexibility and biocompatibility. In the current research, PDMS has been used as the supporting matrix for conductive fillers such as PMMA, PEDOT, and Mxenes. A series of characterization techniques were performed such as Electrochemical Impedance Spectroscopy (EIS), Cyclic Voltammetry (CV) and mechanical testing. The average results of triplicate samples exhibited samples' bulk impedance of 0.913 kΩ, an impedance of 1.612 MΩ, at 1 kHz frequency and a conductivity of 1.41x10-4S/cm, charge storage capacity of 0.056 mC/cm2 and Young's modulus of 3.81 MPa. © 2023 IEEE.

关键词： Elastic moduli

来源：评论

学校读者我要写书评

暂无评论

Z-Laminating Assembly of Graphene Nanoflakes for Super-Strong Membranes and Functional Coatings

引用

ACS Applied Nano Materials 2024年第13期7卷 14957-14963页

作者： Santos, Ian Daniell Tjarks, Patrick Muthu, Jeyavelan Lin, You-Chen Yen, Zhi-Long Chand, Pradyumna Kumar Raman, Radha Nguyen, Dinh Tuan Rouhani, Mehdi Jeng, Yeau-Ren Hsieh, Ya-Ping Hofmann, Mario Department of Physics National Taiwan University Taipei 106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei 106 Taiwan J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Prague 18200 Czech Republic Institute of Atomic and Molecular Sciences Academia Sinica Taipei 106 Taiwan Department of Chemistry National Taiwan University Taipei 106 Taiwan Department of Physics National Central University Taoyuan 320 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Central University Taipei 106 Taiwan Department of Biomedical Engineering National Cheng Kung University 1 University Road Tainan 70101 Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan 70101 Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng-Kung University (NCKU) Tainan 70101 Taiwan

We demonstrate the strengthening of graphene, an atomically thin carbon allotrope, by out-of-plane folding. Through lateral confinement of graphene at the water-air interface, nanoscale buckling was induced in suspended flakes, leading to an unexpected folding transition beyond a critical surface pressure. The emergence of folding was confirmed by in situ Brewster angle reflectivity and ex situ microscopy, showing a unique “z-laminated” nanostructure. Molecular dynamics simulations indicate that z-lamination yields an enhanced adhesion between neighboring flakes compared to lateral sliding, which was confirmed by a surface pressure hysteresis during the folding process. Mechanical testing reveals superior Young’s modulus and yield strength when compared to conventional graphene assemblies and even compared to composites. We demonstrate the potential of the z-lamination approach for applications in graphene-based structural materials, tribological layers, and functional electrochemical coatings. Finally, the complete recyclability of z-laminated graphene opens up new routes toward sustainable nanostructured materials. © 2024 The Authors. Published by American Chemical Society

关键词： 2D materials composites laminated graphene membranes recyclable

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：