检索结果-内蒙古大学图书馆

Post-pinch-off relaxation of two-dimensional droplets in a Hele-Shaw cell

Physical Review Fluids 2018年第12期3卷 124202-124202页

作者： Dhirendra Tiwari Lionel Mercury Marcel Dijkstra Himanshu Chaudhary José Federico Hernández-Sánchez Institut des sciences de la Terre d'Orléans UMR 7327 Université d'Orléans CNRS BRGM 1A rue de la Férollerie 45071 Orléans France Mesoscale Chemical Systems Group MESA+ Institute for Nanotechnology University of Twente P.O. Box 217 7500 AE Enschede The Netherlands The BIOS Lab-on-a-Chip Group MESA+ Institute for Nanotechnology University of Twente P.O. Box 217 7500 AE Enschede The Netherlands Faculty of Electrical Engineering Mathematics and Computer Science (EEMCS) University of Twente P.O. Box 217 7500 AE Enschede The Netherlands School of Engineering Sciences in Chemistry Biotechnology and Health Dept. Chemistry Division of Applied Physical Chemistry KTH Royal Institute of Technology SE-10044 Stockholm Sweden Instituto de Ciencias Aplicadas y Tecnología Universidad Nacional Autónoma de México Circuito Exterior S/N Ciudad Universitaria A.P. 70-186 Delegación Coyoacán C.P. 04510 Ciudad de México México Physics of Fluids group MESA+ Institute for Nanotechnology J. M. Burgers Centre for Fluid Dynamics University of Twente P.O. Box 217 7500 AE Enschede The Netherlands

We report on the shape relaxation of two-dimensional (2D) droplets, formed right after the spontaneous pinch-off of a capillary bridge droplet confined within a Hele-Shaw cell. An array of bridge droplets confined within a microchip device first undergoes neck thinning due to the evaporation-driven volume change. Subsequently, an abrupt topological change transforms each bridge droplet into a small central satellite droplet and the twin droplets pinned at the edges of the cell. We monitor the shape relaxation with high-temporal-resolution optical microscopy. Capillary action drives the 2D shape relaxation, while the viscous dissipation in the film retards it. As a result, the tip of the twin droplets exhibits a self-similar parabolic shape evolution. Based on these observations, the lubrication-approximation model accurately predicts the internal pressure evolution and the droplet tip displacement. The geometrical confinement substantially slows down the dynamics, facilitating visualization of the capillary-viscous regime, even for low-viscosity liquids. The characteristic relaxation timescale shows an explicit dependence on the confinement ratio (width/gap) and the capillary velocity of liquid. We verify the broad applicability of the model using different liquids.

关键词： Complex fluids Interfacial flows Microfluidics Nanofluidics Surface & interfacial phenomena Surface tension effects

来源：评论

学校读者我要写书评

暂无评论

Numerical method for exposure assessment in the low-frequency ranges

Numerical method for exposure assessment in the low-frequenc...

引用

URSI Asia-Pacific Radio Science Conference (URSI AP-RASC)

作者： SangWook Park MinHyuk Kim EMI/EMC R&D Center Korea Automotive Technology Institute Choenan Korea Dept. of Electrical and Computer Engineering Seoul National University Seoul Korea

This paper proposes an effective numerical method for electromagnetic field exposure assessment using anatomical human-body voxel model in the low-frequency ranges. The proposed method is based on the quasi-static finite-difference time-domain method which can rapidly solve the electromagnetic interaction with heterogeneous dielectric and conductive body excited by plane wave even in low-frequency ranges. The equivalent principle is employed to solve the arbitrary source problems. To verify the proposed approach, the internal electric field induced in the simplified human phantom of sphere model exposed to magnetic dipole source is obtained by our approach and compared to those from theory.

关键词： Magnetic resonance imaging Frequency measurement Magnetic field measurement Biological system modeling Surface impedance Impedance measurement

来源：评论

学校读者我要写书评

暂无评论

Neuroimaging Biomarkers of Cognitive Decline in Healthy Older Adults via Unified Learning

Neuroimaging Biomarkers of Cognitive Decline in Healthy Olde...

引用

IEEE Symposium Series on Computational Intelligence

作者： Tayo Obafemi-Ajayi Khalid Al-Jabery Lauren Salminen David Laidlaw Ryan Cabeen Donald Wunsch Robert Paul Engineering Program Missouri State University Springfield MO Dept. of Electrical and Computer Eng. Missouri University of Science and Technology Rolla MO University of Southern California Imaging Genetics Center Los Angeles CA Dept. of Computer Science Brown University Providence RI USC Stevens Neuroimaging and Informatics Institute Los Angeles CA Dept. of Psychological Sciences University of Missouri St. Louis MO

Cognitive aging in healthy adults exhibits significant and heterogeneous variability. In this study, we apply a robust unified learning framework to cluster subgroups using neuroimaging data (brain volume and white matter), to identify neurological phenotypes that can sort out the heterogeneity in cognitive aging and help identify potential risk factors for suboptimal brain aging. Using machine learning analytics, results revealed two unique subgroups in healthy older adults with different patterns of white matter integrity and brain volumetric measures. The classification of phenotypical subgroups in healthy older adults may inform the understanding of the complexity of brain changes before the onset of clinical symptoms. The identified neuroimaging features that defined group classification are recognized as important structures that subserve cognitive performance. Further analysis of these potential biomarkers that help predict trajectory of cognitive decline in symptom free individuals could lead to the detection of early stages of neurodegenerative diseases.

关键词： Neuroimaging Feature extraction Aging Clustering algorithms Algorithm design and analysis Predictive models Biological system modeling

来源：评论

学校读者我要写书评

暂无评论

Investment timing study for residential distributed energy resource projects: A Real-Option approach

Investment timing study for residential distributed energy r...

引用

Innovative Smart Grid Technologies (ISGT)

作者： Xian Guo Jo Min He Guo Dept. of Electrical and Computer Engineering Iowa State University Ames Iowa U.S.A. Dept. of Industrial and Manufacturing Systems Engineering Iowa State Univesrity Ames Iowa U.S.A Shanghai Power Equipment Technology Corporation Shanghai China

ISBN: (纸本)9781509051687

With increasing penetration of distributed energy resources (DERs), the application of DERs projects is of interest. Since it has significant property of flexibility (for example, the option to defer investment), the traditional decision making method-`now or never' is not applicable. In this paper, we propose the utilization of Real Options (RO) method in making decision on the entry time for residential DERs, which considers the decrease in initial costs and can recommend the best investment timing for home owners, in order to maximize the profits, thus flexibility value is addressed in making investments. Monte-Carlo simulation is applied to generate random passes for electricity price. The investment on roof-top solar energy for a community is used as the study case, to verify our theory and corresponding methods.

关键词： Optimization Green products Computational modeling

来源：评论

学校读者我要写书评

暂无评论

Annoyance models for videos with spatio-temporal artifacts

Annoyance models for videos with spatio-temporal artifacts

引用

International Workshop on Quality of Multimedia Experience, QoMEx

作者： Alexandre F. Silva Mylene C. Q. Farias Judith A. Redi Department of Electrical Engineering University of Brasilia Brasilia Brazil Department of Computer Science University of Brasilia Brasilia Brazil Multimedia Computing Dept. Intelligent Systems Delft University of Technology Delft Netherlands

ISBN: (纸本)9781509003556

Although compression and transmission artifacts are likely to appear simultaneously in digital videos, their annoyance has been traditionally studied and modeled in isolation. So, while blockiness, blurriness, and packet-loss metrics exist, hardly any attempt has been made at modeling their joint impact on visual perception. In this paper, we evaluate the perceptual impact of those three artifacts on video quality. Based on data from three different experiments, in which a pool of participants evaluated videos impaired with packet-loss, blurriness and blockiness (in isolation and in combination), we analyze how the different artifacts combine to produce annoyance and propose several models for predicting the annoyance of videos impaired with combinations of packet-loss, blurriness and blockiness.

关键词： Videos Measurement Quality assessment Degradation Monitoring Training

来源：评论

学校读者我要写书评

暂无评论

Effect of alkyl chain length of fluorinated self-assemble monolayer to organic light-emitting diodes as a hole injection layer

Effect of alkyl chain length of fluorinated self-assemble mo...

引用

Indium Phosphide and Related Materials Conference

作者： Tatsuo Mori Tomoya Inden Takao Nishikawa Dept. of Electrical Engineering Aichi Institute of Technology Japan Dept of Electrical Engineering and Computer Science Nagaya University Nagoya Furo-cho Chikusa-ku Japan Center for Regional Collaboration in Research and Education Iwate University Ueda Morioka Iwate Japan

ISBN: (纸本)9781509019656

The introduction of fluorinated self-assembled monolayer (FSAM) enhanced hole injection from indium-tin-oxide (ITO) and improved device lifetime for organic light-emitting diodes. These effects were caused by the large dipole moment of FSAM molecule. We studied the effect of fluorinated alkyl chain length. Although the increase in alkyl chain let to the increase in dipole moment, it also meant the increase in insulating part. However, a small increase in alkyl chain did not influence the enhancement of hole injection from ITO. A short alkyl chain disturbed the regular formation of SAM by lowering an intermolecular interaction.

关键词： Indium tin oxide Organic light emitting diodes Substrates Spontaneous emission electrical engineering Education

来源：评论

学校读者我要写书评

暂无评论

Event reconstruction using pattern spectra and convolutional neural networks for the Cherenkov Telescope Array

arXiv

引用

arXiv 2023年

作者： Peletier, R.F. Abdalla, H. Abe, H. Abe, S. Abusleme, A. Acero, F. Acharyya, A. Acín Portella, V. Ackley, K. Adam, R. Adams, C. Adhikari, S.S. Aguado-Ruesga, I. Agudo, I. Aguilera, R. Aguirre-Santaella, A. Aharonian, F. Alberdi, A. Alfaro, R. Alfaro, J. Alispach, C. Aloisio, R. Alves Batista, R. Amans, J.-P. Amati, L. Amato, E. Ambrogi, L. Ambrosi, G. Ambrosio, M. Ammendola, R. Anderson, J. Anduze, M. Angüner, E.O. Antonelli, L.A. Antonuccio, V. Antoranz, P. Anutarawiramkul, R. Aragunde Gutierrez, J. Aramo, C. Araudo, A. Araya, M. Arbet-Engels, A. Arcaro, C. Arendt, V. Armand, C. Armstrong, T. Arqueros, F. Arrabito, L. Arsioli, B. Artero, M. Asano, K. Ascasíbar, Y. Aschersleben, J. Ashley, M. Attinà, P. Aubert, P. Singh, C.B. Baack, D. Babic, A. Backes, M. Baena, V. Bajtlik, S. Baktash, A. Balazs, C. Balbo, M. Ballester, O. Ballet, J. Balmaverde, B. Bamba, A. Bandiera, R. Baquero Larriva, A. Barai, P. Barbier, C. Barbosa Martins, V. Barcelo, M. Barkov, M. Barnard, M. Baroncelli, L. Barres de Almeida, U. Barrio, J.A. Bastieri, D. Batista, P.I. Batkovic, I. Bauer, C. Bautista-González, R. Baxter, J. Becciani, U. Becerra González, J. Becherini, Y. Beck, G. Becker Tjus, J. Bednarek, W. Belfiore, A. Bellizzi, L. Belmont, R. Benbow, W. Berge, D. Bernardini, E. Bernardos, M.I. Bernlöhr, K. Berti, A. Berton, M. Bertucci, B. Beshley, V. Bhatt, N. Bhattacharyya, S. Bhattacharyya, W. Bhattacharyya, S. Bi, B. Bicknell, G. Biederbeck, N. Bigongiari, C. Biland, A. Bird, R. Bissaldi, E. Biteau, J. Bitossi, M. Blanch, O. Blank, M. Blazek, J. Bobin, J. Boccato, C. Bocchino, F. Boehm, C. Bohacova, M. Boisson, C. Boix, J. Bolle, J.-P. Bolmont, J. Bonanno, G. Bonavolontà, C. Bonneau Arbeletche, L. Bonnoli, G. Bordas, P. Borkowski, J. Bórquez, S. Bose, R. Bose, D. Bosnjak, Z. Bottacini, E. Böttcher, M. Botticella, M.T. Boutonnet, C. Bouyjou, F. Bozhilov, V. Bozzo, E. Brahimi, L. Braiding, C. Brau-Nogué, S. Breen, S. Bregeon, J. Breuhaus, M. Bernoulli Institute for Mathematics Computer Science and Artificial Intelligence University of Groningen PO Box 407 GroningenNL-9700 AK Netherlands Centre for Space Research North-West University Potchefstroom2520 South Africa Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwa-no-ha Chiba Kashiwa277-8582 Japan Pontificia Universidad Católica de Chile Av. Libertador Bernardo O'Higgins 340 Santiago Chile AIM CEA CNRS Université Paris-Saclay Université Paris Diderot Sorbonne Paris Cité CEA Paris-Saclay IRFU/DAp Bat 709 Orme des Merisiers Gif-sur-Yvette91191 France Centre for Advanced Instrumentation Dept. of Physics Durham University South Road DurhamDH1 3LE United Kingdom Port d'Informació Científica Edifici D Carrer de l'Albareda Bellaterrra Cerdanyola del Vallès08193 Spain School of Physics and Astronomy Monash University MelbourneVIC3800 Australia Laboratoire Leprince-Ringuet École Polytechnique UMR 7638 CNRS IN2P3 Institut Polytechnique de Paris Palaiseau91128 France Department of Physics Columbia University 538 West 120th Street New YorkNY10027 United States University of Oslo Department of Physics Sem Saelandsvei 24 - PO Box 1048 Blindern OsloN-0316 Norway EMFTEL department IPARCOS Universidad Complutense de Madrid Madrid28040 Spain Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain Campus UAB Carrer de Can Magrans s/n Cerdanyola del Vallés08193 Spain Instituto de Física Teórica UAM/CSIC Departamento de Física Teórica Universidad Autónoma de Madrid Campus de Cantoblanco UAM c/Nicolás Cabrera 13-15 Madrid28049 Spain Dublin Institute for Advanced Studies 31 Fitzwilliam Place Dublin 2 Ireland Universidad Nacional Autónoma de México Delegación Coyoacán Ciudad de México04510 Mexico University of Geneva Département de Physique Nucléaire et Corpusculaire 24 rue du Général-Dufour Genève 41211 Switzerland INFN Dipartimento di Scienze Fisiche e Chimiche Univer

The Cherenkov Telescope Array (CTA) is the future observatory for ground-based imaging atmospheric Cherenkov telescopes. Each telescope will provide a snapshot of gamma-ray induced particle showers by capturing the induced Cherenkov emission at ground level. The simulation of such events provides camera images that can be used as training data for convolutional neural networks (CNNs) to differentiate signals from background events and to determine the energy of the initial gamma-ray events. Pattern spectra are commonly used tools for image classification and provide the distributions of the sizes and shapes of features comprising an image. The application of pattern spectra on a CNN allows the selection of relevant combinations of features within an image. In this work, we generate pattern spectra from simulated gamma-ray images to train a CNN for signal-background separation and energy reconstruction for CTA. We compare our results to a CNN trained with CTA images and find that the pattern spectra-based analysis is computationally less expensive but not competitive with the purely CTA images-based analysis. Thus, we conclude that the CNN must rely on additional features in the CTA images not captured by the pattern spectra. © 2023, CC BY.

关键词： Gamma rays

来源：评论

学校读者我要写书评

暂无评论

CAD-assisted microwave characterization of ink-jet printed CPW on PET substrates

CAD-assisted microwave characterization of ink-jet printed C...

引用

ARFTG Conference

作者： A. Sahu V. Devabhaktuni A. Lewandowski T. M. Wallis P. H. Aaen Dept. of Electrical Engineering and Computer Science The University of Toledo Toledo Ohio USA Institute of Electronic Systems Warsaw University of Technology Warsaw Poland National Institute of Standards and Technology Boulder Colorado USA Department of Electronic Engineering Advanced Technology Institute University of Surrey UK

ISBN: (纸本)9781509045150

This paper describes the computer-aided-design (CAD)-assited microwave characterization of coplanar waveguide (CPW) lines formed by ink-jet printed technology on flexible polyethylene terephthalate (PET) substrates. A spacemapping technique is used to link the measured results with simulations and the mapping is used to extract the electrical properties of the ink and supporting dielectric spacer employed during measurements. Results indicate that the losses in lines are predominantly due to the loss tangent of the substrate and the conductivity of the ink. Estimates of the conductivity of the ink and the dielectric constant of the spacer used during measurement were obtained as 2.97x10 7 S/m, and 1.79 respectively.

关键词： Substrates Coplanar waveguides Dielectric measurement Ink jet printing Microwave circuits

来源：评论

学校读者我要写书评

暂无评论

Variable slope external ramp to improve the transient performance in constant on-time current mode control

Variable slope external ramp to improve the transient perfor...

引用

IEEE Energy Conversion Congress and Exposition

作者： Syed Bari Qiang Li Fred C. Lee Kuang-Yao Brian Cheng Center for Power Electronics Systems The Bradley Dept. of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24061 USA Texas Instruments 875 Centerville Road Warwick RI 02886 USA

ISBN: (纸本)9781509007387

These days, constant on-time current mode (COTCM) control schemes are widely used in the industry VR controllers for its light load efficiency and higher BW design with simpler compensation requirement. In COTCM control, external ramp is required to be added for jittering reduction to improve the noise performance of the controller. But unfortunately, with the increment of external ramp value, although the jittering in the system gets better, transient performance becomes worse. For this reasons, from transient point of view, it is very challenging to use large external ramp in the system to improve the noise performance. In this paper, a novel method is proposed to modify the external ramp at the transient instant to improve the transient response by increasing the slope of the ramp, and thus allows the control to use the large external ramp for noise performance improvement and enjoys the fast transient response at the same time.

关键词： multi-phase operation constant on-time external ramp transient performance noise sensitivity jittering

来源：评论

学校读者我要写书评

暂无评论

Open and Collaborative Product Design and Production in IoT-enabled Manufacturing Cloud

Open and Collaborative Product Design and Production in IoT-...

引用

IEEE International Conference on systems, Man, and Cybernetics

作者： Chen Yang George Q. Huang Weiming Shen Tingyu Lin Xianbin Wang Shulin Lan HKU-ZIRI Lab for Physical Internet Dept. of Industrial and Manufacturing Systems Engineering The University of Hong Kong Pokfulam Road Hong Kong P.R. China Dept. of Electrical and Computer Engineering University of Western Ontario London ON Canada State Key Lab of Intelligent Manufacturing System Technology Beijing Simulation Center Beijing P.R. China

ISBN: (纸本)9781509018987

Customized/personalized products are gaining more shares in today's product market. Such products need collective efforts from consumers, manufacturers and third parties. On the other side, the Internet of Things (IoT) with pervasive sensing/actuating/networking ability greatly facilitates remote operation of manufacturing activities and efficient collaboration among stakeholders. This provides great opportunities to the above demand. Thus we propose a full-connection model of product lifecycle in the IoT-enabled cloud manufacturing environment. The model uses social networks to connect multiple parties and facilitate open innovations, IoT to glue physical space to cyber space and cloud manufacturing to provide various elastic services, so that the on-demand workspace, interaction, information sharing or collective problem solving are enabled. We also propose a supporting infrastructure for this model using the latest information and communication technologies. Finally, we present a RFID (Radio-frequency identification) enabled production system for customized/personalized products with the ability to enable a new paradigm of "dynamic processes and close collaborations among different roles" and secure robust production.

关键词： RFID Cloud Manufacturing Internet of Things Concurrent engineering Social Network

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：