检索结果-内蒙古大学图书馆

Growth of Gd0.3ca2.7co3.82cu0.18o9-Δ-Bace0.6zr0.2y0.2o3-Δ Bulk Heterojunction Cathode Interlayer by Pulsed Laser Deposition for Enhancing Protonic Solid Oxide Fuel Cell Performance

学校读者我要写书评

暂无评论

SSRN

SSRN 2023年

作者： Umer, Muhammad Abdullah Cheng, Cheng-Yang Lai, Bo-Ruei Tseng, Chung-Jen Chen, Szu-Yuan Lee, Sheng-Wei Molecular Science and Technology program Taiwan International Graduate Program Academia Sinica Taipei City106923 Taiwan Department of Physics National Central University Taoyuan City320317 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei City106923 Taiwan Institute of Materials Science and Engineering National Central University Taoyuan City320317 Taiwan Department of Mechanical Engineering National Central University Taoyuan City320317 Taiwan Department of Chemical and Materials Engineering National Central University Taoyuan City320317 Taiwan

The triple-conducting (e-/H+/O2-) oxides have been extensively studied as the most promising cathode materials for protonic solid oxide fuel cells (P-SOFCs) because of their excellent catalytic activity at lower operating temperatures. However, direct application of these cathode materials by brush-painting or screen-printing provides limited contact area with the underlying electrolyte layer, resulting in high cathode ohmic and polarization resistances. In this study, it is demonstrated that a bulk heterojunction Gd0.3Ca2.7Co3.82Cu0.18O9-δ (GCCCO)-BaCe0.6Zr0.2Y0.2O3-δ (BCZY) layer with a domain width of ~5 nm can be grown by pulsed laser deposition (PLD) via spontaneous phase separation. Such a nanocomposite interlayer between spin-coated BCZY electrolyte and brush-painted GCCCO cathode can effectively increases the interfacial area between the two distinct phases and facilitates proton transport across the interface. This electrode design reduces the ohmic resistance by 0.35 Ω cm2 and the polarization resistance by a factor of three, thus significantly boosting the cell performance. © 2023, The Authors. All rights reserved.

关键词： Pulsed laser deposition

Local Volume Concentration, Packing Domains and Scaling Properties of Chromatin

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Carignano, Marcelo Kröger, Martin Almassalha, Luay Matthew Agrawal, Vasundhara Li, Wing Shun Pujadas-Liwag, Emily M. Nap, Rikkert J. Backman, Vadim Szleifer, Igal Department of Biomedical Engineering Northwestern University EvanstonIL60208 United States Magnetism and Interface Physics & Computational Polymer Physics Department of Materials ETH Zurich ZurichCH-8093 Switzerland Applied Physics Program Northwestern University EvanstonIL60208 United States Department of Gastroenterology and Hepatology Northwestern Memorial Hospital ChicagoIL60611 United States Department of Chemistry Northwestern University EvanstonIL60208 United States

We propose the Self Returning Excluded Volume (SR-EV) model for the structure of chromatin based on stochastic rules and physical interactions. The SR-EV rules of return generate conformationally-defined domains observed by single cell imaging techniques. From nucleosome to chromosome scales, the model captures the overall chromatin organization as a corrugated system, with dense and dilute regions alternating in a manner that resembles the mixing of two disordered bi-continuous phases. This particular organizational topology is a consequence of the multiplicity of interactions and processes occurring in the nuclei, and mimicked by the proposed return rules. Single configuration properties and ensemble averages show a robust agreement between theoretical and experimental results including chromatin volume concentration, contact probability, packing domain identification and size characterization, and packing scaling behavior. Model and experimental results suggest that there is an inherent chromatin organization regardless of the cell character and resistant to an external forcing such as Rad21 degradation. © 2023, CC BY-SA.

关键词： Stochastic systems

Non-Hermitian metasurface for asymmetric thermal emission

学校读者我要写书评

暂无评论

Non-Hermitian metasurface for asymmetric thermal emission

Conference on Lasers and Electro-Optics (CLEO)

作者： Ciril S. Prasad Henry O. Everitt Gururaj V. Naik Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA U.S. Army DEVCOM Army Research Laboratory-South Houston TX USA

Non-Hermitian optics provides a unique platform to take advantage of absorption losses in materials and control radiative properties. We demonstrate a non-Hermitian metasurface that exhibit directional suppression of ... 详细信息

ISBN: (纸本)9781957171258

关键词： Fused silica Optical constants Photon counting Remote sensing Thermal emission Thermal imaging

Chemical Structures and Stability of Amine Plasma Polymers Deposited on Porous Hydroxyapatite Artificial Bone with Bipolar Pulsed Discharges

学校读者我要写书评

暂无评论

SSRN

SSRN 2024年

作者： Harumningtyas, Anjar Anggraini Ito, Tomoko Michlíček, Miroslav Kodama, Joe Nečas, David Kita, Hidekazu Kaito, Takashi Zajíčková, Lenka Hamaguchi, Satoshi International Priority Graduate Program on Applied and Engineering Physics Division of Precision Engineering and Applied Physics Osaka University 2-1 Yamadaoka Suita Osaka565-0871 Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka565-0871 Japan Jalan Babarsari Kotak Pos 6101 ykbb Yogyakarta55281 Indonesia Department of Condensed Matter Physics Faculty of Science Masaryk University Kotlarska 2 Brno61137 Czech Republic Department of Orthopaedic Surgery Osaka University Graduate School of Medicine Osaka565-0871 Japan CEITEC Central European Institute of Technology Brno University of Technology Purkyňova 123 Brno61200 Czech Republic

A recent in vivo study by Kodama et al. shows that porous artificial bones coated with aminecontaining polymers deposited in a plasma-enhanced chemical vapour deposition (PECVD) process with high-voltage, low-frequency bipolar pulsed discharges significantly enhanced bone regeneration. This article reports the chemical and physical properties of amine plasma polymers (PPs) formed under the same deposition conditions, including the film stability for up to two months, the effects of sterilization on the chemical compositions of the films, and the penetration of amine PPs into the inner surfaces of interconnected microscopic pores of the amine-PP-coated porous artificial bone. It was found that, immediately after the plasma polymerization process, approximately 15% of nitrogen atoms on the surface of the deposited amine PP formed primary amines but the number decreased to approximately 5% over one month if the sample was exposed to ambient air or sterilized by autoclaving or ethylene oxide gas. Nitriles ( –CN) were also detected in the deposited amine PPs. Molecular dynamics simulations of simplified deposition processes suggest that the observed nitriles were likely to be formed by the incorporation of gas-phase cyano radicals that were also observed in the experiments of this study. © 2024, The Authors. All rights reserved.

关键词： Hydroxyapatite

Million-Q Free Space Meta-Optical Resonator at Visible Wavelengths

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Fang, Jie Chen, Rui Sharp, David Renzi, Enrico M. Manna, Arnab Kala, Abhinav Mann, Sander A. Yao, Kan Munley, Christopher Rarick, Hannah Tang, Andrew Pumulo, Sinabu Zheng, Yuebing Menon, Vinod M. Alù, Andrea Majumdar, Arka Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States Department of Physics University of Washington SeattleWA98195 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York New YorkNY10016 United States Walker Department of Mechanical Engineering Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Department of Materials Science and Engineering University of Washington SeattleWA98195 United States Department of Physics City College of New York New YorkNY10031 United States

High-quality (Q)-factor optical resonators with extreme temporal coherence are of both technological and fundamental importance in optical metrology1,2, continuous-wave lasing3-5, and semiconductor quantum optics6-8. Despite extensive efforts in designing high-Q resonators across different spectral regimes, the experimental realization of very large Q-factors at visible wavelengths remains challenging due to the small feature size that is sensitive to fabrication imperfections9-12, and thus is typically implemented in integrated photonics1-4,9,10. In the pursuit of free-space optics with the benefits of large space-bandwidth product and massive parallel operations13,14, here we design and fabricate a visible-wavelength etch-free metasurface with minimized fabrication defects and experimentally demonstrate a million-scale ultrahigh-Q resonance. A new laser-scanning momentum-space-resolved spectroscopy technique with extremely high spectral and angular resolution is developed to characterize the record-high Qfactor as well as the dispersion of the million-Q resonance in free space. By integrating monolayer WSe2 into our ultrahigh-Q meta-resonator, we further demonstrate laser-like highly unidirectional and narrow-linewidth exciton emission, albeit without any operating power density threshold. Under continuous-wave laser pumping, we observe pump-power-dependent linewidth narrowing at room temperature, indicating the potential of our meta-optics platform in controlling coherent quantum light-sources. Our result also holds great promise for applications like optical sensing, spectral filtering, and few-photon nonlinear optics. Copyright © 2024, The Authors. All rights reserved.

关键词： Continuous wave lasers

BPS2025 - Transport of chemical signals within cell filopodia

学校读者我要写书评

暂无评论

Biophysical Journal 2025年第3期124卷 143a-143a页

作者： Mohamed O. Mahmoud Khattab C. Nadir Kaplan Engineering Mechanics Program Virginia Tech Blacksburg VA USA Department of Physics Virginia Tech Blacksburg VA USA

Physically consistent gravitational waveform for capturing beyond general relativity effects in the compact object merger phase

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Watarai, Daiki Nishizawa, Atsushi Cannon, Kipp Graduate School of Science The University of Tokyo Tokyo113-0033 Japan Graduate School of Science The University of Tokyo Tokyo113-0033 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima Hiroshima739-8526 Japan

The merger phase of compact binary coalescences is the strongest gravity regime that can be observed. To test the validity of general relativity (GR) in strong gravitational fields, we propose a gravitational waveform parameterized for deviations from GR in the dynamical and nonlinear regime of gravity. Our fundamental idea is that perturbative modifications to a GR waveform can capture possible deviations in the merger phase that are difficult to model in a specific theory of gravity. One of notable points is that our waveform is physically consistent in the sense that the additional radiative losses of energy and angular momentum associated with beyond-GR modifications are included. Our prescription to ensure physical consistency in the whole coalescence process is expected to be applicable to any deviation from the standard model of compact binary coalescence, such as the extended models of gravity or the environmental effects of compact objects, as long as perturbative modifications are considered. Based on the Fisher analysis and the compatibility with Einstein-dilaton Gauss-Bonnet waveforms, we show that our parameterization is a physically-consistent minimal one that captures the deviations in the nonlinear regime. Copyright © 2023, The Authors. All rights reserved.

关键词： Merging

Investigating the effects of QCD matter’s electrical conductivity on charge dependent directed flow

学校读者我要写书评

暂无评论

arXiv 2025年

作者： Benoit, Nicholas J. Miyoshi, Takahiro Nonaka, Chiho Takahashi, Hiroyuki R. Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8511 Japan Department of Physics Nagoya University Nagoya464-8602 Japan Kobayashi Maskawa Institute Nagoya University Nagoya464-8602 Japan International Institute for Sustainability with Knotted Chiral Meta Matter Hiroshima University Higashi-Hiroshima739-8511 Japan Department of Natural Sciences Faculty of Arts and Sciences Komazawa University Tokyo154-8525 Japan

Charge dependent directed flow is an important observable of electromagnetic fields in relativistic heavy-ion collisions. We demonstrate how the difference in charge dependent directed flows between protons and antiprotons is sensitive to the resistivity, inverse of quark-gluon plasma’s electric conductivity, over different collision centralities. Our model numerically solves the 3+1D relativistic resistive magneto-hydrodynamic (RRMHD) equations, assuming the electric conductivity to be a scalar. For this work, we focus on symmetric Au + Au collisions at the top RHIC energy of √s = 200 GeV. We illustrate the time evolution of the electromagnetic fields in our model and connect that to the charge dependent directed flow results. Our results highlight the importance of modeling quark-gluon plasma’s electric conductivity for charge dependent observables in relativistic heavy-ion collisions. Copyright © 2025, The Authors. All rights reserved.

关键词： Heavy ions

Gaussian Mixture Model based Convolutional Sparse Coding for Radar Heartbeat Detection 14

学校读者我要写书评

暂无评论

Gaussian Mixture Model based Convolutional Sparse Coding for...

14th International Conference on Signal Processing and Communication Systems, ICSPCS 2020

作者： Liu, Jingwei Zhang, J. Andrew Xu, Richard Pearce, Andre Ni, Wei Hedley, Mark University of Technology School of Electrical and Data Engineering SydneyNSW Australia CSIRO Cyber Physics Program Data61 Australia

ISBN: (纸本)9781728199726

Accurate detection of heartbeat through radar has many potential applications in, e.g., security and health. However, it is generally challenging to obtain clear heart-beat signature, due to its weak signal and relatively large interference caused by, e.g., body and respiration movement. In this paper, we propose an advanced algorithm based on convolutional sparse coding (CSC) and Gaussian mixture model (GMM) for suppressing the interference and extracting clear heartbeat signals. In this study, heartbeat signals are modelled by CSC and recovered by exploiting the sparsity of the signal. GMM is introduced to model the unknown noise, which could be a mixture from multiple noise/interference sources. The parameters of GMM, dictionary and codes are computed via the expectation maximization (EM) algorithm. To achieve faster processing, convolution computing is proposed to be processed in the frequency domain. The proposed method is tested and validated by simulation and experiments. The results show that our proposed algorithm can accurately extract the heartbeat components. © 2020 IEEE.

关键词： Convolution