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Author Correction: Atomic-resolution three-dimensional hydration structures on a heterogeneously charged surface

Nature communications 2018年第1期9卷 2099页

作者： Kenichi Umeda Lidija Zivanovic Kei Kobayashi Juha Ritala Hiroaki Kominami Peter Spijker Adam S Foster Hirofumi Yamada Department of Electronic Science and Engineering Kyoto University Katsura Nishikyo Kyoto 615-8510 Japan. Department of Advanced Material Science The University of Tokyo Kashiwa Chiba 277-8561 Japan. COMP Centre of Excellence Department of Applied Physics Aalto University Helsinki FI-00076 Finland. The Hakubi Center for Advanced Research Kyoto University Katsura Nishikyo Kyoto 615-8520 Japan. COMP Centre of Excellence Department of Applied Physics Aalto University Helsinki FI-00076 Finland. adam.foster@aalto.fi. Division of Electrical Engineering and Computer Science Kanazawa University Kanazawa 920-1192 Japan. adam.foster@aalto.fi. Department of Electronic Science and Engineering Kyoto University Katsura Nishikyo Kyoto 615-8510 Japan. h-yamada@kuee.kyoto-u.ac.jp.

The original version of the Supplementary Information associated with this Article contained an error in Supplementary Figure 9e,f in which the y-axes were incorrectly labelled from '-40' to '40', rather than the correct '-400' to '400'. The HTML has been updated to include a corrected version of the Supplementary Information.

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Growth mode of nitride semiconductors on nano-patterned sapphire substrates by molecular beam epitaxy

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Physica Status Solidi (C) Current Topics in Solid State Physics 2016年第5-6期13卷 195-199页

作者： Song, Bowen Sun, Haiding Kao, Chen-Kai Moustakas, Theodore D. Electrical and Computer Engineering Department Photonics Center Boston University 8 Saint Mary's Street BostonMA02215 United States Materials Science and Engineering Division Boston University 8 Saint Mary's Street BostonMA0221 United States

In this paper we report on the growth mode by plasmaassisted MBE of nitride films on nano-patterned sapphire substrates. Such substrates were fabricated using nano-sphere and nano-imprint lithographies, which led to cone-and cylinder-shaped patterns respectively. The data indicate that the pillars of the patterned substrate act a seeds for the subsequent growth and that the growth proceeds through the formation of a fully faceted pyramidal top surface. As the growth proceeds to more than 3 μm, the growth is dominated by the lateral growth of the top (0001) facets since the fluxes of the precursors on the inclined facets are lower. Eventually, these hexagonal (0001) facets coalesce leading to a continuous film with a smooth surface morphology. This multifaceted growth mode at the initial stages has the potential of lateral expulsion of threading dislocation by the inclined facets leading to nitride pillars with minimum number of threading dislocations. Cathodoluminescence measurements indicate significant increase in the emission intensity from the films grown on the nanopatterned sapphire substrates, compared to the emission from the films grown on the un-patterned sapphire substrates. This increase is partly due to improvements in light extraction and partly to the improved crystalline quality of the films. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Nitrides

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Solution box

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URSI Radio science Bulletin 2016年第357期2016卷 51-53页

作者： Özgür Ergül Ismail E. Uysai H. Arda Ulkü Hakan Bağci Department of Electrical and Electronics Engineering Middle East Technical University TR-06800 Ankara Turkey Division of Computer Electrical and Mathematical Sciences and Engineering (CEMSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Department of Electronics Gebze Technical University Gebze Kocaeli 41400 Turkey

We have received a pair of new problems involving plasmonic spheres and their reference solutions in the time domain. The main focus of SOLBOX-04, which was submitted by Ismail E. Uysal, H. Arda Olku, and Hakan BagcI, is computing scattered fields from gold spheres. The challenge is incorporating plasmonic effects that dominate at optical frequencies. In addition to negative permittivity values to be used in the implementations, the submitters had to deal with the highly dispersive properties of the structures in the time domain. Reference solutions were also provided along with the descriptions of the problems. Mie-series solutions were also available for one of them, demonstrating the accuracy of their approach. We are looking forward to receiving alternative solutions for these new, challenging problems, as well as for the previous submissions in the earlier issues (SOLBOX-Ol, SOLBOX-02, and SOLBOX-03).

关键词： Time-domain analysis Gold Integral equations Plasmons Antennas Optical scattering Electronic mail

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Designing dielectric light trapping structures for c-si solar cells

Designing dielectric light trapping structures for c-si sola...

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International Conference on Fibre Optics and Photonics, Photonics 2016

作者： Pathi, Prathap Biswas, Rana Ames Laboratory and Microelectronics Research Center Iowa State University AmesIA50011 United States Silicon Solar Cell Division National Physical Laboratory Dr. K.S. Krishnan Road New Delhi110012 India Ames Laboratory Microelectronics Research Center Department of Physics and Astronomy Department of Electrical and Computer Engineering Iowa State University AmesIA50011 United States

ISBN: (纸本)9781943580224

Unique three-dimensional TiO2 dielectric nanostructures that efficiently trap light in thin silicon cells over a broad-band solar spectrum (300-1100 nm) were developed using rigorous scattering matrix simulations. We find a high optical absorbance of > 95 % with a predicted shortcircuit current density approaching the 4n2 limit. The simulations elaborate the light trapping performance of 3-D dielectric structures, providing guidance for designing the 3-D structures to be integrated over the flat silicon substrate surfaces. The study demonstrates a promising approach for designing a variety of photovoltaic devices, particularly flexible crystalline silicon solar cells. © OSA 2016.

关键词： Titanium dioxide

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Inflammation in gastric cancer: Interplay of the COX-2/prostaglandin E₂ and Toll-like receptor/MyD88 pathways (vol 107, pg 391, 2016)

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CANCER science 2016年第7期107卷 1059-1059页

作者： Echizen, K. Hirose, O. Maeda, Y. Oshima, M. Division of Genetics Cancer Research Institute Kanazawa University Kanazawa Japan. AMED-CREST AMED Japan Agency for Medical Research and Development Tokyo Japan. Faculty of Electrical and Computer Engineering Institute of Science and Engineering Kanazawa University Kanazawa Japan. Division of Gene Regulation Institute for Advanced Medical Research Keio University Tokyo Japan.

Cyclooxygenase-2 (COX-2) and its downstream product prostaglandin E2 (PGE2 ) play a key role in generation of the inflammatory microenvironment in tumor tissues. Gastric cancer is closely associated with Helicobacter pylori infection, which stimulates innate immune responses through Toll-like receptors (TLRs), inducing COX-2/PGE2 pathway through nuclear factor-κB activation. A pathway analysis of human gastric cancer shows that both the COX-2 pathway and Wnt/β-catenin signaling are significantly activated in tubular-type gastric cancer, and basal levels of these pathways are also increased in other types of gastric cancer. Expression of interleukin-11, chemokine (C-X-C motif) ligand 1 (CXCL1), CXCL2, and CXCL5, which play tumor-promoting roles through a variety of mechanisms, is induced in a COX-2/PGE2 pathway-dependent manner in both human and mouse gastric tumors. Moreover, the COX-2/PGE2 pathway plays an important role in the maintenance of stemness with expression of stem cell markers, including CD44, Prom1, and Sox9, which are induced in both gastritis and gastric tumors through a COX-2/PGE2 -dependent mechanism. In contrast, disruption of Myd88 results in suppression of the inflammatory microenvironment in gastric tumors even when the COX-2/PGE2 pathway is activated, indicating that the interplay of the COX-2/PGE2 and TLR/MyD88 pathways is needed for inflammatory response in tumor tissues. Furthermore, TLR2/MyD88 signaling plays a role in maintenance of stemness in normal stem cells as well as gastric tumor cells. Accordingly, these results suggest that targeting the COX-2/PGE2 pathway together with TLR/MyD88 signaling, which would suppress the inflammatory microenvironment and maintenance of stemness, could be an effective preventive or therapeutic strategy for gastric cancer.

关键词： Gastric cancer inflammation innate immunity microenvironment stemness

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(S)TEM Characterization of Chemically Exfoliated Black Phosphorus

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Microscopy and Microanalysis 2016年第S3期22卷 1544-1545页

作者： Amy Ng Thomas E. Sutto Yexin Deng Rhonda M. Stroud Todd H. Brintlinger Peide D. Ye Nabil D. Bassim NRC Postdoctoral Associate Naval Research Laboratory Washington DC USA Naval Research Laboratory Materials Science & Technology Division Washington DC USA Purdue University School of Electrical and Computer Engineering West Lafayette IN USA

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The MISO Wiretap Channel with Noisy Main Channel Estimation in the High Power Regime

The MISO Wiretap Channel with Noisy Main Channel Estimation ...

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Global Communications Conference

作者： Zouheir Rezki Anas Chaaban Basel Alomair Mohamed-Slim Alouini Electrical and Computer Engineering Department University of Idaho Moscow ID USA Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology Thuwal Mekkah Province Saudi Arabia The National Center for Cybersecurity Technology (C4C) King Abdulaziz City for Science and Technology Riyadh Saudi Arabia

We improve upon our previous upper bound on the secrecy capacity of the wiretap channel with multiple transmit antennas and single-antenna receivers, with noisy main channel state information (CSI) at the transmitter (CSI-T). Specifically, we show that if the main CSI error does not scale with the power budget at the transmitter P, then the secrecy capacity is bounded above essentially by log log (P) yielding a secure degree of freedom (sdof) equal to zero. However, if the main CSI error scales as {formula},for β∈e [0,1], then the sdof is equal to β.

关键词： transmitter antennas single-antenna

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An autonomous, visually-guided, counter-sUAS aerial vehicle with net countermeasure

An autonomous, visually-guided, counter-sUAS aerial vehicle ...

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AIAA Atmospheric Flight Mechanics Conference, 2016

作者： Horiuchi, Timothy K. Paras, Marc Cervi, Tim Oursler, Brent Sanz, Santiago Gaus, Joshua Mccoll, Daniel Woller, Stephen Woodbury, Donald Faruque, Imraan Xu, Huan Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Department of Mechanical Engineering University of Maryland College ParkMD20742 United States Department of Aerospace Engineering University of Maryland College ParkMD20742 United States Division of Research University of Maryland College ParkMD20742 United States Institute for Systems Research University of Maryland College ParkMD20742 United States Neuroscience and Cognitive Science Program University of Maryland College ParkMD20742 United States

ISBN: (数字)9781624104305

ISBN: (纸本)9781510827431

To address the growing concern of small unmanned aircraft systems (sUAS) entering the airspace over a public event, building, or other protected spaces (whether for recreational purposes or with malicious intent), we are developing a counter-sUAS solution. This solution is based on an aerial intercept vehicle that autonomously pursues the target sUAS and launches a net to entangle the propellers and/or unbalance the sUAS to bring it to the ground. The intercept vehicle is a hexacopter that is guided by a visible-light camera and a single-pixel lidar mounted on a gimbal to track the target sUAS. A custom-built, lightweight, C02 cartridge-powered, net launcher mounted to the top of the vehicle fires when the intercept vehicle is oriented properly at the target and when it is in range. In this manuscript, we describe the problem constraints, system design, image processing chain, computational infrastructure, physical implementations, and various measurements of performance. We describe the current state of development and our experience with the challenge of designing effective countermeasures. Copyright © 2016 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Image processing

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Nanoscale Optoregulation of Neural Stem Cell Differentiation by Intracellular Alteration of Redox Balance

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Advanced Functional Materials 2017年第38期27卷

作者： Hassanpour-Tamrin, Sara Taheri, Hossein Mahdi Hasani-Sadrabadi, Mohammad Hamed Shams Mousavi, S. Dashtimoghadam, Erfan Tondar, Mahdi Adibi, Ali Moshaverinia, Alireza Sanati Nezhad, Amir Jacob, Karl I. University of Calgary CalgaryABT2N 1N4 Canada Department of Biomedical Engineering Amirkabir University of Technology Tehran15916-34311 Iran School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States Parker H. Petit Institute for Bioengineering and Bioscience G.W. Woodruff School of Mechanical Engineering School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332 United States Weintraub Center for Reconstructive Biotechnology Division of Advanced Prosthodontics School of Dentistry University of California Los AngelesCA900951668 United States California NanoSystems Institute University of California 570 Westwood Plaza Los AngelesCA90095-7227 United States Marquette University School of Dentistry MilwaukeeWI United States Department of Biomedical Sciences Board of Governors Regenerative Medicine Institute Cedars Sinai Medical Center Los AngelesCA United States

Regulation of stem cell (SC) fate, a decision between self-renewal and differentiation, is of immense importance in regenerative medicine and has been proven to be a powerful stimulus regulating many cell functions influencing the SC fate. This study uses triphenylphosphonium-functionalized gold nanoparticles (TPP-AuNPs) to explore the interplay of intracellular electromagnetic (EM) exposure and the SC fate. Localized EM waves are generated inside neural stem cells (NSCs) to stimulate TPP-AuNPs (AuNPs), targeting the mitochondria through inducing reactive oxygen species and differentiating these cells into neurons. Following laser irradiation of TPP-AuNPs-transfected NSCs, their differentiation to neurons is monitored by tracing the relevant markers both at the genetic and protein levels. The electrophysiology technique is further used to examine the functionality of neurons. The results confirm that TPP-AuNPs subjected to electromotive forces have the potential to regulate cellular fate, although further investigations are still required to shed light on the mechanisms underlying the interaction of EM-stimulated TPP-AuNPs on cellular fate to design highly adjustable cell differentiation and reprogramming methods. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： Stem cells

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Resonant properties of dipole skyrmions in amorphous Fe/Gd multilayers

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physical Review B 2017年第22期95卷 224405-224405页

作者： S. A. Montoya S. Couture J. J. Chess J. C. T. Lee N. Kent M.-Y. Im S. D. Kevan P. Fischer B. J. McMorran S. Roy V. Lomakin E. E. Fullerton Center for Memory and Recording Research University of California San Diego La Jolla California 92093 USA Department of Electrical and Computer Engineering University of California San Diego La Jolla California 92093 USA Space and Naval Warfare Systems Center - Pacific San Diego California 92152 USA Department of Physics University of Oregon Eugene Oregon 97401 USA Center for X-Ray Optics Lawrence Berkeley National Laboratory Berkeley California 94720 USA Physics Department University of California Santa Cruz California 94056 USA Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology Daegu Korea Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

The dynamic response of dipole skyrmions in Fe/Gd multilayer films is investigated by ferromagnetic resonance measurements and compared to micromagnetic simulations. We detail thickness- and temperature-dependent studies of the observed modes as well as the effects of magnetic field history on the resonant spectra. Correlation between the modes and the magnetic phase maps constructed from real-space imaging and scattering patterns allows us to conclude that the resonant modes arise from local topological features such as dipole skyrmions but do not depend on the collective response of a close-packed lattice of these chiral textures. Using micromagnetic modeling, we are able to quantitatively reproduce our experimental observations which suggests the existence of localized spin-wave modes that are dependent on the helicity of the dipole skyrmion. We identify four localized spin-wave excitations for the skyrmions that are excited under either in-plane or out-of-plane rf fields. Lastly we show that dipole skyrmions and nonchiral bubble domains exhibit qualitatively different localized spin-wave modes.

关键词： Magnetic susceptibility Magnetism Micromagnetism Skyrmions Spin waves

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