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arXiv 2021年

作者： Barani, Zahra Kargar, Fariborz Ghafouri, Yassamin Baraghani, Saba Sudhindra, Sriharsha Mohammadzadeh, Amirmahdi Salguero, Tina T. Balandin, Alexander A. Center Department of Electrical and Computer Engineering University of California RiversideCA92521 United States Department of Chemical and Environmental Engineering University of California RiversideCA92521 United States Department of Chemistry University of Georgia AthensGA30602 United States Material Science and Engineering Program University of California RiversideCA92521 United States

We report on the preparation of flexible polymer composite films with aligned metallic fillers comprised of atomic chain bundles of the quasi-one-dimensional (1D) van der Waals material tantalum triselenide, TaSe3. The material functionality, embedded at the nanoscale level, is achieved by mimicking the design of an electromagnetic aperture grid antenna. The processed composites employ chemically exfoliated TaSe3 nanowires as the grid building blocks incorporated within the thin film. Filler alignment is achieved using the "blade coating" method. Measurements conducted in the X-band frequency range demonstrate that the electromagnetic transmission through such films can be varied significantly by changing the relative orientations of the quasi-1D fillers and the polarization of the electromagnetic wave. We argue that such polarization-sensitive polymer films with quasi-1D fillers are applicable to advanced electromagnetic interference shielding in future communication systems. Copyright © 2021, The Authors. All rights reserved.

关键词： Van der Waals forces

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Untrained, Physics-Informed Neural Networks for Structured Illumination Microscopy

arXiv

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arXiv 2022年

作者： Burns, Zachary Liu, Zhaowei Department of Electrical and Computer Engineering University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Material Science and Engineering Program University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Center for Memory and Recording Research University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States

In recent years there has been great interest in using deep neural networks (DNN) for super-resolution image reconstruction including for structured illumination microscopy (SIM). While these methods have shown very promising results, they all rely on data-driven, supervised training strategies that need a large number of ground truth images, which is experimentally difficult to realize. Additionally, such trained methods are prone to overfitting and often fail to generalize well to data that is out of the training distribution making them unsuitable as tools of discovery. For SIM imaging, there exists a need for a flexible, general, and open-source reconstruction method that can be readily adapted to different forms of structured illumination. We demonstrate that we can combine a deep neural network with the forward model of the structured illumination process to reconstruct sub-diffraction images without training data. The resulting physics-informed neural network (PINN) can be optimized on a single set of diffraction limited sub-images and thus doesn’t require any training set. We show with simulated and experimental data that this PINN can be applied to a wide variety of SIM methods by simply changing the known illumination patterns used in the loss function and can achieve resolution improvements that match well with theoretical expectations. © 2022, CC BY.

关键词： Deep neural networks

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Two-dimensional ReS2: Solution to the unresolved queries on its structure and inter-layer coupling leading to potential optical applications

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Physical Review materials 2021年第5期5卷 054006-054006页

作者： Janardhan Rao Gadde Anasuya Karmakar Tuhin Kumar Maji Subhrajit Mukherjee Rajath Alexander Anjanashree M. R. Sharma Sarthak Das Anirban Mandal Kinshuk Dasgupta Akshay Naik Kausik Majumdar Ranjit Hawaldar K. V. Adarsh Samit Kumar Ray Debjani Karmakar Centre for Materials for Electronic Technology Pune 411008 India Indian Institute of Science Education and Research Pune 411008 India Department of Chemical Biological and Macromolecular Sciences S. N. Bose National Centre for Basic Sciences Salt Lake Kolkata 700106 India Department of Physics Indian Institute of Technology Kharagpur Kharagpur 721302 India Advanced Carbon Materials Section Materials Science Group Bhabha Atomic Research Centre Trombay Mumbai 400085 India Centre for Nano Science and Engineering Indian Institute of Science Bangalore 560012 India Department of Electrical Communication Engineering Indian Institute of Science Bangalore 560012 India Department of Physics Indian Institute of Science Education and Research Bhopal 462066 India Department of Condensed Matter Physics and Material Science S. N. Bose National Centre for Basic Sciences Salt Lake Kolkata 700106 India Technical Physics Division Bhabha Atomic Research Centre Trombay Mumbai 400085 India

Over the last few years, ReS2 has generated a myriad of unattended queries regarding its structure, the concomitant thickness-dependent electronic properties, and its apparently contrasting experimental optical response. In this paper, with elaborate first-principles investigations, using density functional theory (DFT) and time-dependent DFT, we identify the structure of ReS2, which is capable of reproducing and analyzing the layer-dependent optical response. The theoretical results are further validated by an in-depth structural, chemical, optical, and optoelectronic analysis of the large-area ReS2 thin films, grown by the chemical vapor deposition (CVD) process. Micro-Raman, x-ray photoelectron spectroscopy, cross-sectional transmission electron microscopy, and energy-dispersive x-ray analysis have enabled the optimization of the uniform growth of the CVD films. The correlation between the optical and electronic properties was established by static photoluminescence and excited state transient absorption measurements. Sulfur vacancy-induced localized mid-gap states render a significantly long lifetime of the excitons in these films. The ionic gel top-gated photodetectors, fabricated from the as-prepared CVD films, exhibit a large photo-response of ∼5 A/W and a remarkable detectivity of ∼1011 Jones. The outcome of this paper will be useful in promoting the application of vertically grown large-area films in the field of optics and opto-electronics.

关键词： Electronic structure Optoelectronics Thin films Transition metal dichalcogenides Chemical vapor deposition Density functional theory Photoluminescence Transient absorption spectroscopy Transmission electron microscopy

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Performance of vehicle direction behavior on turning conditions by adding braking force proportion control

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AIP Conference Proceedings 2024年第1期3053卷

作者： I. Ketut Adi Atmika I. Gusti Agung Kade Suriadi Mechanical Engineering Department of Udayana University Street of Bukit Jimbaran Bali 80361 Indonesia Technology and Material Research Center of Udayana University Street of Bukit Jimbaran Bali 80361 Indonesia Doctoral Program of Engineering Science Engineering Faculty of Udayana University Street of PB Sudirman Bali 80114 Indonesia

The performance of vehicle direction stability both on straight roads and turning roads is one of the important aspects to be considered in designing automotive products as a whole. In straight road conditions, an antilock brake system has been developed or better known as the Antilock Breaking System (ABS), but in turning conditions, the standard ABS performance is less than optimal to overcome oversteer or understeer vehicle conditions. The less optimal performance of vehicle direction stability is due to the magnitude of the braking force of each wheel is still the same while in turning conditions the braking force requirements of each wheel are not the same. One strategy to overcome these weaknesses is to control the proportion of braking force on each wheel. The research was conducted by formulating the physical model of the system into a mathematical model, then simulating it with a Simulink matlab. The braking force proportion control system model, and the vehicle model are made completely, then integrated into the vehicle direction stability performance plant/system. The simulation results show that at a fairly high speed of 80 km/hour the braking system with control of the proportion of braking force is still quite good, while the standard ABS at speeds above 60 km/hour tends to oversteer.

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Linewidth broadening induced by fundamental thermal fluctuations in metallo-dielectric nanolasers

Linewidth broadening induced by fundamental thermal fluctuat...

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CLEO: Applications and Technology, CLEO_AT 2020

作者： Jiang, Sizhu Pan, Si Hui Deka, Suruj S. Chengyi-Fang Chen, Zijun Fainman, Yeshaiahu El Amili, Abdelkrim Department of Electrical and Computer Engineering University of California San Diego San DiegoCA92093-0407 United States Department of Physics University of California San Diego San DiegoCA92093-0407 United States Material Science and Engineering Program University of California San Diego San DiegoCA92093-0407 United States

We demonstrate that the fundamental thermal fluctuations can induce significant linewidth broadening effect in metallo-dielectric nanolasers through numerical simulation. Broader linewidths are observed with the decre... 详细信息

ISBN: (数字)9781943580767

ISBN: (纸本)9781557528209

关键词： Linewidth

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Linewidth Broadening Induced by Fundamental Thermal Fluctuations in Metallo-Dielectric Nanolasers

Linewidth Broadening Induced by Fundamental Thermal Fluctuat...

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2020 Conference on Lasers and Electro-Optics, CLEO 2020

作者： Jiang, Sizhu Pan, Si Hui Deka, Suruj S. Chengyi-Fang Chen, Zijun Fainman, Yeshaiahu Amili, Abdelkrim El Department of Electrical and Computer Engineering University of California San Diego San DiegoCA92093-0407 United States Department of Physics University of California San Diego San DiegoCA92093-0407 United States Material Science and Engineering Program University of California San Diego La Jolla CA92093-0407 United States

ISBN: (纸本)9781943580767

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Eu@C86 isomers: Calculated relative populations

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Fullerenes, Nanotubes & Carbon Nanostructures 2020年第7期28卷 565-570页

作者： Slanina, Zdeněk Uhlík, Filip Bao, Lipiao Akasaka, Takeshi Lu, Xing Adamowicz, Ludwik State Key Laboratory of Materials Processing and Die & Mould Technology School of Material Science and Engineering Huazhong University of Science and Technology Wuhan China Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Prague Czech Republic Department of Chemistry and Biochemistry University of Arizona Tucson AZ USA

Relative populations of four energy-lowest IPR (isolated-pentagon-rule) isomers of Eu@C86 are computed using the Gibbs energy based on characteristics from density functional theory calculations (M06-2X/3-21G ∼ SDD entropy term, M06-2X/6-31G*∼SDD or B2PLYP(D)/6-31G*∼SDD energetics). The calculations confirm that the recently isolated Eu@C1(7)-C86 species is a major isomer in a relevant temperature region. Relationship to the empty C86 cages is discussed, too. [ABSTRACT FROM AUTHOR]

关键词： DFT & MP2 computations Eu@C86 Gibbs-energy evaluations IPR fullerene cages isomeric populations metallofullerenes

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Effects of gas grafting treatment with different amounts of palmitoyl chloride on properties of CNF-coated paper

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2020年第1期52卷 55-65页

作者： Park, Min-A. Choi, Kyoung-Hwa Cho, Byoung-Uk Department of Paper Science and Engineering College of Forest and Environmental Sciences Kangwon National University Korea Republic of Changgang Institute of Paper Science and Technology Kangwon National University Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Korea Republic of

Effects of gas grafting treatment using palmitoyl chloride on properties of papers coated with three different types of CNFs whose crystalline structures are different were investigated. One type of cellulose I based CNF (cellulose nanofibril) and two types of cellulose II based CNFs were utilized for this study. Effects of the applied amount of palmitoyl chloride on the CNF coated papers were also investigated. It was found that tensile strength and stabilities of optical properties of the CNF coated papers such as color, brightness, and yellowness were deteriorated with the gas grafting treatment with palmitoyl chloride. Increasing the applied amount of palmitoyl chloride increased the degree of deterioration. Applying excess amount of palmitoyl chloride for gas grafting increased the roughness of the CNF coated paper. In addition, increasing the pick-up of CNF on paper increased air resistance while the applied amount of palmitoyl chloride did not show any significant effects on air permeability. © 2020 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Gases

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Evolution of Incommensurate Charge Density Waves Quantified with In Situ TEM

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Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Shen, Jeremy M Sung, Suk Hyun Agarwal, Nishkarsh Stangel, Alex Hovden, Robert Department of Electrical and Computer Engineering University of Michigan Ann Arbor MI USA Rowland Institute at Harvard Harvard University Cambridge MA USA Department of Material Science and Engineering University of Michigan Ann Arbor MI USA Applied Physics Program University of Michigan Ann Arbor MI USA

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Finite element modeling of the seepage flow of water under concrete dams with sheet piles

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AIP Conference Proceedings 2024年第1期3034卷

作者： Raed Abokwiek Rami H. Hawileh Jamal A. Abdalla Graduate student Material Science and Engineering PhD Program American University of Sharjah P.O.Box 26666 Sharjah United Arab Emirates Professor Department of Civil Engineering American University of Sharjah P.O.Box 26666 Sharjah United Arab Emirates

A finite element model (FEM) is developed to analyze the problem of seepage flow of water under concrete dams with sheet piles. The model was developed using the finite element software ANSYS, based on equivalent thermal analysis and correlation with seepage performance. The issue of water seepage under concrete dams is addressed mathematically. In this study, the effects of several parameters on porous soil seepage velocity distribution are studied. Sheet pile parameters were varied in depth, location and number of sheet piles. The sheet pile with variables of 0, 1, 2, and 3 pieces, location of 0, 0.5, and 1 of dam width, and the depth of the sheet piles varying as 2 and 4 m, respectively. The developed FE models were verified by a previous study and used for further parametric studies. It was concluded that increased sheet pile depth reduces the seepage flow. In addition, the location of the sheet pile is an important factor in seepage velocity, as it might increase the flow away from dam toe in a similar fashion to dam depth effects. Moreover, increasing the number of sheet piles further reduces the seepage velocity in comparison to usage of a single sheet pile. The sheet pile configuration and parameters are integrated with each other and each factor influence the others, resulting in various seepage flow patterns. This study demonstrates that FE modeling can effectively predict seepage flow under concrete dams with sheet piles.

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