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arXiv 2018年

作者： Silverman, J.D. Daddi, E. Rujopakarn, W. Renzini, A. Mancini, C. Bournaud, F. Puglisi, A. Rodighiero, G. Liu, D. Sargent, M. Arimoto, N. Béthermin, M. Fensch, J. Hayward, C.C. Kartaltepe, J. Kashino, D. Koekemoer, A. Magdis, G. McCracken, H.J. Nagao, T. Sheth, K. Smolčić, V. Valentino, F. Kavli Institute for the Physics and Mathematics of the Universe University of Tokyo Kashiwa277-8583 Japan Laboratoire AIM CEA/DSM-CNRS-Universite Paris Diderot Irfu/Service d'Astrophysique CEA Saclay Department of Physics Faculty of Science Chulalongkorn University 254 Phayathai Road Pathumwan Bangkok10330 Thailand Don Kaeo Mae Rim Chiang Mai50180 Thailand Kavli Institute for the Physics and Mathematics of the Universe Todai Institutes for Advanced Study University of Tokyo Kashiwa277-8583 Japan Instituto Nazionale de Astrofisica Osservatorio Astronomico di Padova v.co dell'Osservatorio 5 PadovaI-35122 Italy Dipartimento di Fisica e Astronomia Universita di Padova vicolo Osservatorio 3 Padova35122 Italy Astronomy Centre Department of Physics and Astronomy University of Sussex BrightonBN1 9QH United Kingdom Astronomy Program Department of Physics and Astronomy Seoul National University 599 Gwanak-ro Gwanak-gu Seoul151-742 Korea Republic of Subaru Telescope 650 North A'ohoku Place Hilo Hawaii96720 United States European Southern Observatory Karl-Schwarzschild-Str. 2 Garching85748 Germany European Southern Observatory Karl-Schwarzschild-Str. 2 Garching bei München85748 Germany Center for Computational Astrophysics Flatiron Institute 162 Fifth Avenue New YorkNY10010 United States School of Physics and Astronomy Rochester Institute of Technology 84 Lomb Memorial Drive RochesterNY14623 United States Institute of Astronomy ETH Zürich Wolfgang-Pauli-Strasse 27 ZürichCH-8093 Switzerland Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Cosmic DAWN Centre Niels Bohr Institute University of Copenhagen Juliane Mariesvej 30 Copenhagen2100 Denmark Institut d'Astrophysique de Paris CNRS UMR 7095 and UPMC 98bis boulevard Arago ParisF-75014 France Graduate School of Science and Engineering Ehime University 2-5 Bunkyo-cho Matsuyama790-8577 Japan NASA Headquaters 300 E. St SW WashingtonDC2054

We report on the discovery of a merger-driven starburst at z = 1:52, PACS-787, based on high signal-to-noise ALMA observations. CO(5-4) and continuum emission (850μm) at a spatial resolution of 0.3" reveal two compact (r1/2 ∼ 1 kpc) and interacting molecular gas disks at a separation of 8.6 kpc thus indicative of an early stage in a merger. With a SFR of 991 Mo yr-1, this starburst event should occur closer to final coalescence, as usually seen in hydrodynamical simulations. From the CO size, inclination, and velocity profile for both disks, the dynamical mass is calculated through a novel method that incorporates a calibration using simulations of galaxy mergers. Based on the dynamical mass, we measure (1) the molecular gas mass, independent from the CO luminosity, (2) the ratio of the total gas mass and the CO(1 - 0) luminosity (αCO ≡ Mgas/L'CO1-0), and (3) the gas-to-dust ratio, with the latter two being lower than typically assumed. We find that the high star formation, triggered in both galaxies, is caused by a set of optimal conditions: a high gas mass/fraction, a short depletion time (τdepl = 85 and 67 Myrs) to convert gas into stars, and the interaction of likely counter-rotating molecular disks that may accelerate the loss of angular momentum. The state of interaction is further established by the detection of di_use CO and continuum emission, tidal debris that bridges the two nuclei and is associated with stellar emission seen by HST/WFC3. This observation demonstrates the power of ALMA to study the dynamics of galaxy mergers at high redshift. Copyright © 2018, The Authors. All rights reserved.

关键词： Galaxies

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Band offset formation at semiconductor heterojunctions through density-based minimization of interface energy

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Physical Review B 2016年第7期94卷 075310-075310页

作者： Raymond T. Tung Leeor Kronik Department of Physics Brooklyn College CUNY Brooklyn New York 11210 USA and Physics Ph.D. Program Graduate Center CUNY New York New York 10016 USA Department of Materials and Interfaces Weizmann Institute of Science Rehovoth 76100 Israel

It is well known that the magnitude of band offset (BO) at any semiconductor heterojunction is directly derivable from the distribution of charge at that interface and that the latter is decided by a minimization of total energy. However, the fact that BO formation is governed by energy minimization has not been explicitly used in theoretical BO models, likely because the equilibrium charge densities at heterojunction interfaces appear difficult to predict, except via explicit calculation. In this paper, electron densities at a large number of (100), (110), and (111) oriented heterojunctions between lattice-matched, isovalent semiconductors with the zinc blende (ZB) structure have been calculated by first-principles methods and analyzed in detail for possible common characteristics among energy-minimized densities. Remarkably, the heterojunction electron density was found to largely depend only on the immediate, local atomic arrangement. In fact, it is so much so that a juxtaposition of local electron-densities generated in oligo-cells (LEGOs) accurately reproduced the charge densities that minimize the energy for the heterojunctions. Furthermore, the charge distribution for each bulk semiconductor was found to display a striking separability of its electrostatic effect into two neutral parts, associated with the cation and the anion, which are approximately transferrable among semiconductors. These discoveries form the basis of a neutral polyhedra theory (NPT) that approximately predicts the equilibrium charge density and BO of relaxed heterojunctions from the energy minimization requirement. Well-known experimentally observed characteristics of heterojunctions, such as the insensitivity of BO to heterojunction orientation and the identity of interface bonds, the transitivity rule, etc., are all in good agreement with the NPT. Therefore, energy minimization, which essentially decides the electronic properties of all other solid and molecular systems, also governs t

关键词： Semiconductors Surface & interfacial phenomena Interfaces Density functional theory Electronic structure

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Correction: Extended visible to near-infrared harvesting of earth-abundant FeS2–TiO2 heterostructures for highly active photocatalytic hydrogen evolution

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Green Chemistry 2018年第11期20卷 2663-2663页

作者： Tsung-Rong Kuo Hsiang-Ju Liao Yu-Ting Chen Chuan-Yu Wei Chia-Che Chang Yi-Chia Chen Yi-Hsuan Chang Jou-Chun Lin Yi-Cheng Lee Cheng-Yen Wen Shao-Sian Li Kung-Hsuan Lin Di-Yan Wang Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University Taipei 11031 Taiwan International Ph.D. Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei 11031 Taiwan Department of Chemistry Tunghai University Taichung 40704 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Department of Materials Science and Engineering National Taiwan University Taipei Taiwan Graduate Institute of Biomedical Optomechatronics College of Biomedical Engineering Taipei Medical University Taipei 11031 Taiwan

Correction for ‘Extended visible to near-infrared harvesting of earth-abundant FeS2–TiO2 heterostructures for highly active photocatalytic hydrogen evolution’ by Tsung-Rong Kuo et al., Green Chem., 2018, 20, 1640–...

Correction for ‘Extended visible to near-infrared harvesting of earth-abundant FeS₂–TiO₂ heterostructures for highly active photocatalytic hydrogen evolution’ by Tsung-Rong Kuo et al., Green Chem., 2018, 20, 1640–1647.

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A continuum poisson-‐boltzmann model for membrane channel proteins

arXiv

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arXiv 2017年

作者： Xiao, Li Diao, Jianxiong Greene, D'Artagnan Wang, Junmei Luo, Ray Department of Biomedical Engineering University of California IrvineCA92697 United States Department of Molecular Biology and Biochemistry University of California IrvineCA92697 United States Chemical and Materials Physics Graduate Program University of California IrvineCA92697 Department of Chemical Engineering and Materials Science University of California IrvineCA92697 United States Department of Pharmaceutical Sciences University of Pittsburg PittsburghPA15261 United States

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THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT Z ∼ 1.6 VI: REDSHIFT AND EMISSION-LINE CATALOG AND BASIC PROPERTIES OF STAR-FORMING GALAXIES

arXiv

引用

arXiv 2018年

作者： Kashino, Daichi Silverman, John D. Sanders, David Kartaltepe, Jeyhan Daddi, Emanuele Renzini, Alvio Rodighiero, Giulia Puglisi, Annagrazia Valentino, Francesco Juneau, Stéphanie Arimoto, Nobuo Nagao, Tohru Ilbert, Olivier Le Fèvre, Olivier Koekemoer, Anton M. Department of Physics ETH Zürich Wolfgang-Pauli-strasse 27 ZürichCH-8093 Switzerland Kavli Institute for the Physics and Mathematics of the Universe University of Tokyo Kavli IPMU WPI Kashiwanoha KashiwaChiba277-8583 Japan Institute for Astronomy University of Hawaii 2680 Woodlawn Drive HonoluluHI96822 United States School of Physics and Astronomy Rochester Institute of Technology 84 Lomb Memorial Drive RochesterNY14623 United States Laboratoire AIM-Paris-Saclay CEA/DSM-CNRS-Université Paris Diderot Irfu/Service d’Astrophysique CEA-Saclay Service d’Astrophysique Gif-sur-YvetteF-91191 France INAF Osservatorio Astronomico di Padova vicolo dell’Osservatorio 5 PadovaI-35122 Italy Dipartimento di Fisica e Astronomia Universitá di Padova vicolo dell’Osservatorio 2 PadovaI-35122 Italy Dark Cosmology Centre Niels Bohr Institute University of Copenhagen Juliane Maries Vej 30 CopenhagenDK-2100 Denmark National Optical Astronomy Observatory 950 North Cherry Avenue TucsonAZ85719 United States Astronomy Program Department of Physics and Astronomy Seoul National University 599 Gwanak-ro Gwanaku-gu Seoul151-742 Korea Republic of Graduate School of Science and Engineering Ehime University 2-5 Bunkyo-cho Matsuyama790-8577 Japan Aix Marseille Université CNRS LAM - Laboratoire d’Astrophysique de Marseille 38 rue F. Joliot-Curie MarseilleF-13388 France Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States

We present a new data release from the Fiber Multi-Object Spectrograph (FMOS)-COSMOS survey, which contains the measurements of spectroscopic redshift and flux of rest-frame optical emission lines (Hα, [N ii], [S ii], Hβ, [O iii]) for 1931 galaxies out of a total of 5484 objects observed over the 1.7 deg2 COSMOS field. We obtained H-band and J-band medium-resolution (R ∼ 3000) spectra with FMOS mounted on the Subaru telescope, which offers an in-fiber line flux sensitivity limit of ∼ 1 × 10−17 erg s−1 cm−2 for an on-source exposure time of five hours. The full sample contains the main population of star-forming galaxies at z ∼ 1.6 over the stellar mass range 109.5 . M∗/M☉ . 1011.5, as well as other subsamples of infrared-luminous galaxies detected by Spitzer and Herschel at the same and lower (z ∼ 0.9) redshifts and X-ray emitting galaxies detected by Chandra. This paper presents an overview of our spectral analyses, a description of the sample characteristics, and a summary of the basic properties of emission-line galaxies. We use the larger sample to re-define the stellar mass–star formation rate relation based on the dust-corrected Hα luminosity, and find that the individual galaxies are better fit with a parametrization including a bending feature at M∗ ≈ 1010.2 M☉, and that the intrinsic scatter increases with M∗ from 0.19 to 0.37 dex. We also confirm with higher confidence that the massive (M∗ & 1010.5 M☉) galaxies are chemically mature as much as local galaxies with the same stellar masses, and that the massive galaxies have lower [S ii]/Hα ratios for their [O iii]/Hβ, as compared to local galaxies, which is indicative of enhancement in ionization parameter. Copyright © 2018, The Authors. All rights reserved.

关键词： Galaxies

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In-situThermal Testing on Nanostructures in TEM

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Microscopy and Microanalysis 2016年第S3期22卷 770-771页

作者： Hua Guo Will J. Hardy Panpan Zhou Douglas Natelson Jun Lou Department of Materials Science and NanoEngineering Rice University Houston Texas USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas USA Department of Physics and Astronomy Rice University Houston Texas USA

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(OA48) Prospective In-Silico Quality Assurance Study of Contouring Target Volumes in Thoracic Tumors Within a Cooperative Group Setting

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International Journal of Radiation Oncology*Biology*physics 2018年第2期101卷 e20-e20页

作者： Hesham Elhalawani Abdallah Mohamed Fran Laurie Laurie E. Gaspar Thomas J. Fitzgerald Paul Okunieff Clifton D. Fuller Charles R. Thomas Radiation Oncology University of Texas MD Anderson Cancer Center Imaging and Radiation Oncology Core Rhode Island University of Massachusetts Medical School University of Colorado Denver Department of Radiation Oncology University of Massachusetts Medical School Department of Radiation Oncology University of Florida Medical Physics Program The University of Texas Graduate School of Biomedical Sciences Department of Radiation Medicine Knight Cancer Institute Oregon Health & Science University

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Thermal current-induced charge redistribution in wide CVD-grown graphene constriction

Thermal current-induced charge redistribution in wide CVD-gr...

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Indium Phosphide and Related Materials Conference

作者： Chiashain Chuang Tak-Pong Woo Fan-Hung Liu Masahiro Matsunaga Yuichi Ochiai Chi-Te Liang Nubuyuki Aoki Graduate School of Advanced Integration Science Chiba University Chiba Japan The Germination Program Office Science & Technology Policy Research and Information Center Taipei Taiwan Department of Physics National Taiwan University Taipei Taiwan Graduate Institute of Applied Physics National Taiwan University taipei Taiwan

ISBN: (纸本)9781509019656

Chemical vapor deposition (CVD) graphene would find great applications in industrial graphene-based electronics recently. Most importantly, the one-dimensional constriction of CVD graphene due to its grain boundaries and merged domains revealing interesting interference effects, like Aharonov-Bohm effect. Such interesting interference transport behavior can be revealed by low-temperature scanning gate microscopy (LT-SGM) and be numerical simulated about the dynamic transport point of view by mean-field Gross-Pitaevskii equation. In order to realize graphene-based quantum transport device, our results suggested that the supplying additional thermal current could flood into the grain boundaries and merged domains in one-dimensional quantum confined CVD graphene so as to suppress the interference effect, a great discovery for graphene-based materials coherent electronic devices.

关键词： Graphene Interference Grain boundaries Logic gates Scanning electron microscopy Compounds

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Development of two tier test to assess conceptual understanding in heat and temperature

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Journal of physics: Conference Series 2017年第1期795卷

作者： Winarti Cari Suparmi Widha Sunarno Edi Istiyono Graduate Students Sebelas Maret University Physics Graduate of Doctorate Program Sebelas Maret University Doctorate Program on Science Education. Sebelas Maret University Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 INDONESIA Physics Education Department faculty of Mathematics and Natural Sciences Yogyakarta State University

Heat and temperature is a concept that has been learnt from primary school to undergraduate levels. One problem about heat and temperature is that they are presented abstractly, theoretical concept. A student conceptual frameworks develop from their daily experiences. The purpose of this research was to develop a two-tier test of heat and temperature concept and measure conceptual understanding of heat and temperature of the student. This study consist of two method is qualitative and quantitative method. The two-tier test was developed using procedures defined by Borg and Gall. The two-tier test consisted of 20 question and was tested for 137 students for collecting data. The result of the study showed that the two-tier test was effective in determining the students' conceptual understanding and also it might be used as an alternative for assessment and evaluation of students' achievement

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Boundary effects of weak nonlocality in multilayered dielectric metamaterials

arXiv

引用

arXiv 2017年

作者： Castaldi, Giuseppe Alù, Andrea Galdi, Vincenzo Fields and Waves Lab Department of Engineering University of Sannio BeneventoI-82100 Italy 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 YorkNY10026 United States Department of Electrical Engineering City College of New York New YorkNY10031 United States

Nonlocal (spatial-dispersion) effects in multilayered metamaterials composed of periodic stacks of alternating, deeply subwavelength dielectric layers are known to be negligibly weak. Counterintuitively, under certain critical conditions, weak nonlocality may build up strong boundary effects that are not captured by conventional (local) effective-medium models based on simple mixing formulas. Here, we show that this phenomenon can be fruitfully studied and understood in terms of error propagation in the iterated maps of the trace and anti-trace of the optical transfer matrix of the multilayer. Our approach effectively parameterizes these peculiar effects via remarkably simple and insightful closed-form expressions, which enable direct identification of the critical parameters and regimes. We also show how these boundary effects can be captured by suitable nonlocal corrections. Copyright © 2017, The Authors. All rights reserved.

关键词： Metamaterials

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