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The calculation of low-energy electron-impact excitation cross sections of Helium from excited states

Journal of physics: Conference Series 2014年第4期488卷

作者： De-Ling Zeng Xiang Gao Xiao-Ying Han Jia-Ming Li Beijing Computational Science Research Center Beijing 100084 China Data Center for High Energy Density Materials Institute of Applied Physics and Computational Mathematics Beijing 100088 China Department of Physics and Center for Atomic and Molecular Nanosciences Tsinghua University Beijing 100084 China Department of Physics and Joint Center for Inertial Fusion Science and Application of China Shanghai Jiao Tong University Shanghai 200240 China

The low energy electron impact cross sections of helium from some low excited states are calculated in the R-matrix method. The convergences of the cross sections are checked systematically by using 5 sets of high qua...

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Joint Analysis of BICEP2/Keck Array and Planck data

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Physical Review Letters 2015年第10期114卷 101301-101301页

作者： P. A. R. Ade N. Aghanim Z. Ahmed R. W. Aikin K. D. Alexander M. Arnaud J. Aumont C. Baccigalupi A. J. Banday D. Barkats R. B. Barreiro J. G. Bartlett N. Bartolo E. Battaner K. Benabed A. Benoît A. Benoit-Lévy S. J. Benton J.-P. Bernard M. Bersanelli P. Bielewicz C. A. Bischoff J. J. Bock A. Bonaldi L. Bonavera J. R. Bond J. Borrill F. R. Bouchet F. Boulanger J. A. Brevik M. Bucher I. Buder E. Bullock C. Burigana R. C. Butler V. Buza E. Calabrese J.-F. Cardoso A. Catalano A. Challinor R.-R. Chary H. C. Chiang P. R. Christensen L. P. L. Colombo C. Combet J. Connors F. Couchot A. Coulais B. P. Crill A. Curto F. Cuttaia L. Danese R. D. Davies R. J. Davis P. de Bernardis A. de Rosa G. de Zotti J. Delabrouille J.-M. Delouis F.-X. Désert C. Dickinson J. M. Diego H. Dole S. Donzelli O. Doré M. Douspis C. D. Dowell L. Duband A. Ducout J. Dunkley X. Dupac C. Dvorkin G. Efstathiou F. Elsner T. A. Enßlin H. K. Eriksen E. Falgarone J. P. Filippini F. Finelli S. Fliescher O. Forni M. Frailis A. A. Fraisse E. Franceschi A. Frejsel S. Galeotta S. Galli K. Ganga T. Ghosh M. Giard E. Gjerløw S. R. Golwala J. González-Nuevo K. M. Górski S. Gratton A. Gregorio A. Gruppuso J. E. Gudmundsson M. Halpern F. K. Hansen D. Hanson D. L. Harrison M. Hasselfield G. Helou S. Henrot-Versillé D. Herranz S. R. Hildebrandt G. C. Hilton E. Hivon M. Hobson W. A. Holmes W. Hovest V. V. Hristov K. M. Huffenberger H. Hui G. Hurier K. D. Irwin A. H. Jaffe T. R. Jaffe J. Jewell W. C. Jones M. Juvela A. Karakci K. S. Karkare J. P. Kaufman B. G. Keating S. Kefeli E. Keihänen S. A. Kernasovskiy R. Keskitalo T. S. Kisner R. Kneissl J. Knoche L. Knox J. M. Kovac N. Krachmalnicoff M. Kunz C. L. Kuo H. Kurki-Suonio G. Lagache A. Lähteenmäki J.-M. Lamarre A. Lasenby M. Lattanzi C. R. Lawrence E. M. Leitch R. Leonardi F. Levrier A. Lewis M. Liguori P. B. Lilje M. Linden-Vørnle M. López-Caniego P. M. Lubin M. Lueker J. F. Macías-Pérez B. Maffei D. Maino N. Mandolesi A. Mangilli M. Maris P. G. Martin E. Martínez-González S. Masi P. Mason S. Matarrese K. G. Megerian School of Physics and Astronomy Cardiff University Queens Buildings The Parade Cardiff CF24 3AA United Kingdom Institut d’Astrophysique Spatiale CNRS (UMR8617) Université Paris-Sud 11 Bâtiment 121 Orsay France Department of Physics Stanford University Stanford California 94305 USA California Institute of Technology Pasadena California USA Harvard-Smithsonian Center for Astrophysics 60 Garden Street MS 42 Cambridge Massachusetts 02138 USA Laboratoire AIM IRFU/Service d’Astrophysique–CEA/DSM–CNRS–Université Paris Diderot Bâtiment 709 CEA-Saclay F-91191 Gif-sur-Yvette Cedex France SISSA Astrophysics Sector via Bonomea 265 34136 Trieste Italy Université de Toulouse UPS-OMP IRAP F-31028 Toulouse cedex 4 France CNRS IRAP 9 Avenue colonel Roche BP 44346 F-31028 Toulouse cedex 4 France Joint ALMA Observatory Vitacura Santiago Chile Instituto de Física de Cantabria (CSIC-Universidad de Cantabria) Avenida de los Castros s/n Santander Spain APC AstroParticule et Cosmologie Université Paris Diderot CNRS/IN2P3 CEA/lrfu Observatoire de Paris Sorbonne Paris Cité 10 rue Alice Domon et Léonie Duquet 75205 Paris Cedex 13 France Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena California USA Dipartimento di Fisica e Astronomia G. Galilei Università degli Studi di Padova via Marzolo 8 35131 Padova Italy Istituto Nazionale di Fisica Nucleare Sezione di Padova via Marzolo 8 I-35131 Padova Italy University of Granada Departamento de Física Teórica y del Cosmos Facultad de Ciencias Granada Spain University of Granada Instituto Carlos I de Física Teórica y Computacional Granada Spain Institut d’Astrophysique de Paris CNRS (UMR7095) 98 bis Boulevard Arago F-75014 Paris France UPMC Université de Paris 06 UMR7095 98 bis Boulevard Arago F-75014 Paris France Institut Néel CNRS Université Joseph Fourier Grenoble I 25 rue des Martyrs Grenoble France Department of Physics and Astronomy University College London L

We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and Keck Array have observed the same approximately 400 deg2 patch of sky centered on RA 0 h, Dec. −57.5°. The combined maps reach a depth of 57 nK deg in Stokes Q and U in a band centered at 150 GHz. Planck has observed the full sky in polarization at seven frequencies from 30 to 353 GHz, but much less deeply in any given region (1.2 μK deg in Q and U at 143 GHz). We detect 150×353 cross-correlation in B modes at high significance. We fit the single- and cross-frequency power spectra at frequencies ≥150 GHz to a lensed-ΛCDM model that includes dust and a possible contribution from inflationary gravitational waves (as parametrized by the tensor-to-scalar ratio r), using a prior on the frequency spectral behavior of polarized dust emission from previous Planck analysis of other regions of the sky. We find strong evidence for dust and no statistically significant evidence for tensor modes. We probe various model variations and extensions, including adding a synchrotron component in combination with lower frequency data, and find that these make little difference to the r constraint. Finally, we present an alternative analysis which is similar to a map-based cleaning of the dust contribution, and show that this gives similar constraints. The final result is expressed as a likelihood curve for r, and yields an upper limit r0.05<0.12 at 95% confidence. Marginalizing over dust and r, lensing B modes are detected at 7.0σ significance.

关键词： STOKES equations FREQUENCIES of oscillating systems POWER spectra GRAVITATIONAL waves

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Ratio of forbidden transition rates in the ground-state configuration of O ii

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Physical Review A 2012年第6期85卷 062506-062506页

作者： Xiao-Ying Han Xiang Gao De-Ling Zeng Jun Yan Jia-Ming Li Data Center for High Energy Density Materials Institute of Applied Physics and Computational Mathematics Beijing 100088 China Beijing Computational Science Research Center Beijing 100084 China Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China Key Laboratory for Laser Plasma (Ministry of Education) and Department of Physics Shanghai Jiao Tong University Shanghai 200240 China Department of Physics and Center for Atomic and Molecular Nanosciences Tsinghua University Beijing 100084 China

Based on a set of “quasicomplete bases,” using the large-scale multiconfiguration Dirac-Fock (MCDF) method, we calculate the forbidden electric quadrupole (E2) and magnetic dipole (M1) transition rates of the transitions 2D5/2,3/2o→4S3/2o of the O ii ground state considering the quantum electrodynamics (QED) corrections. Our calculations demonstrate that the Breit interactions are most important among all the QED corrections. The calculated E2 and M1 transition rates converge in a systematical and uniform manner with the extending orbital basis and the calculation uncertainty of 2.5% is achieved by considering the valence- and core-excitation correlations totally. With the converged transition rates, a value of the intensity ratio between the two transitions in high-electron-density limit in planetary nebulas is given, that is, r(∞)=0.363±0.009, which is within the overlap of the different observations and with the least uncertainty up to now. In addition, the E2 and M1 transition rates of two transitions 2P3/2,1/2o→4S3/2o of O ii ground state and the ratio between the two transition rates in high-electron-density limit are calculated and compared with the previous results.

关键词： Ground state

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A constant cyclotron line energy in 4U 0115+634

A constant cyclotron line energy in 4U 0115+634

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9th INTEGRAL Workshop and Celebration of the 10th Anniversary of the Launch, INTEGRAL 2012

作者： Müller, S. Ferrigno, C. Kühnel, M. Schönherr, G. Becker, P.A. Wolff, M.T. Hertel, D. Schwarm, F.-W. Grinberg, V. Obst, M. Caballero, I. Pottschmidt, K. Fürst, F. Kreykenbohm, I. Rothschild, R.E. Hemphill, P. Martínez Núñez, S. Torrejón, J.M. Klochkov, D. Staubert, R. Wilms, J. Dr. Karl Remeis-Observatory and ECAP Universität Erlangen-Nürnberg Bamberg Germany ISDC Data Center for Astrophysics University of Geneva Versoix Switzerland Leibniz-Institut für Astrophysik Potsdam Potsdam Germany School of Physics Astronomy and Computational Sciences MS 5C3 George Mason University Fairfax VA 22030 United States Space Science Division Naval Research Laboratory S.W. Washington DC 20375 United States CNRS/CEA Université Paris 7 Diderot Gif sur Yvette France CRESST NASA Goddard Space Flight Center Greenbelt MD 20771 United States Center for Space Science and Technology UMBC Baltimore MD 21250 United States Space Radiation Laboratory 290-17 Cahill Caltech Pasadena CA 91125 United States Center for Astrophysics and Space Sciences University of California San Diego San Diego CA 92093 United States Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías University of Alicante Alicante Spain Institut für Astronomie und Astrophysik Universität Tübingen Tübingen Germany

We present a study of RXTE and INTEGRAL spectra of the transient 3.6 s X-ray pulsar 4U 0115+634 taken during a giant outburst in 2008 March/April. The spectra can be almost equally well modeled by two different semi-empirical continuum models, modified by an Fe Kα fluorescence line, interstellar absorption, and cyclotron resonance scattering features (CRSFs) located at ∼10.7, 21.8, 35.5, 46.7, and 59.7 keV. One of these two models, the so called NPEX model, leads to an anticorrelation between the centroid energy of the fundamental CRSF E0 and the X-ray flux FX, in agreement with previous works. The other model, consisting of a simple exponentially cutoff power law modified by a Gaussian emission feature around 10 keV, however, leads to a constant value for E0 for the observed fluxes and a comparatively narrow line shape. We show that the cyclotron line model component resulting from the NPEX fits rather contribute to the broadband continuum model. We conclude that the previously reported anticorrelation is probably due to an artifact of the particular modeling of the continuum. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Cyclotrons

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Near field properties of monolayers of colloidal polystyrene microspheres on silicon

Near field properties of monolayers of colloidal polystyrene...

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IEEE International Nanoelectronics Conference (INEC)

作者： S. M. Huang Z. A. Wang Z Sun Z. B. Wang Boris Luk'yanchuk Engineering Research Center of Nanophotonics and Advanced Instrument Ministry of Education Department of Physics East China Jiao Tong University Shanghai China Engineering Research Center for Nanophotonics and Advanced Instrument Ministry of Education Department of physics East China Normal University Shanghai P. R. China Laser Processing Research Centre School of Mechanical Aerospace and Civil Engineering University of Manchester Manchester UK Data Storage Institute DSI Building Singapore Republic of Singapore

ISBN: (纸本)9781424435432;9781424435449

We have investigated the optical resonance and near field effects of 2D periodic and absorptive polystyrene (PS) microspheres on Si wafers. The light scattering and coupling of neighbored PS spheres was numerically studied. Nanostructures were prepared on Si substrates using the regular 2D arrays by a single pulsed laser irradiation (KrF, ¿ = 248 nm). Periodical PS nanoparticle, PS nanoflowers and Si nanobumps were fabricated by different laser fluence. Mechanisms for PS particle size reduction and Si nanobump formation by laser irradiation were discussed on the base of the theoretical calculations. Good agreement between theoretical calculations and experimental results has been observed.

关键词： Silicon Laser theory High speed optical techniques Optical films data engineering Atomic force microscopy Scanning electron microscopy Optical scattering Optical sensors Nanostructures

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Thermostability of the N-terminal RNA-binding domain of the SARS-CoV nucleocapsid protein: Experiments and numerical simulations

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Biophysical Journal 2009年第5期96卷 1892-1901页

作者： Fang, Huey-Jen Chen, Yong-Zhong Mai, Suan Li Wu, Ming-Chya Chang, Chun-Ling Chang, Chung-Ke Hsu, Yen-Lan Huang, Tai-Huang Chen, Hueih-Min Tsong, Tian-Yow Hu, Chin-Kun Institute of Physics Academia Sinica Warsaw Poland Agricultural Biotechnology Research Center Academia Sinica Warsaw Poland Institute of Biomedical Sciences Academia Sinica Nankang Taipei Taiwan Institute of Physics Polish Academy of Sciences Warsaw Poland Institute for Computational Science and Technology Ho Chi Minh City Viet Nam Research Center for Adaptive Data Analysis National Central University Chungli Taiwan Department of Physics National Central University Chungli Taiwan Nano Biosystem Technology Division National Nano Device Laboratories Hsinchu Taiwan Institute of Physics Academy of Sciences Taipei Taiwan National Chiao Tung University Hsinchu Taiwan Center for Nonlinear and Complex Systems Department of Physics Chung Yuan Christian University Chungli Taiwan

Differential scanning calorimetry, circular dichroism spectroscopy, nuclear magnetic resonance spectroscopy, and numerical simulations were used to study the thermostability of the N-terminal RNA-binding domain (RBD) of the SARSCoV nucleocapsid protein. The transition temperature of the RBD in a mixing buffer, composed of glycine, sodium acetate, and sodium phosphate with 100 mM sodium chloride, at pH 6.8, determined by differential scanning calorimetry and circular dichroism, is 48.74°C. Experimental results showed that the thermal-induced unfolding-folding transition of the RBD follows a two-state model with a reversibility >90%. Using a simple Gō-like model and Langevin dynamics we have shown that, in agreement with our experiments, the folding of the RBD is two-state. Theoretical estimates of thermodynamic quantities are in reasonable agreement with the experiments. Folding and thermal unfolding pathways of the RBD also were experimentally and numerically studied in detail. It was shown that the strand β1 from the N-terminal folds last and unfolds first, while the remaining β-strands fold/unfold cooperatively. © 2009 by the Biophysical Society.

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Dynamics and evolution of stochastic bistable gene networks with sensing in fluctuating environments

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Physical Review E 2008年第6期78卷 061902-061902页

作者： Andre S. Ribeiro []Computational Systems Biology Research Group Department of Signal Processing Tampere University of Technology Finland and Center for Computational Physics University of Coimbra P-3004-516 Coimbra Portugal

We study how cells can optimize fitness in variable environments by tuning the internal fluctuations of protein expression of a bistable genetic switch. We model cells as bistable toggle switches whose dynamics are governed by a delayed stochastic simulation algorithm. Each state of the toggle switch makes the cell more fit in one of two environmental conditions. Different noise levels in protein expression yield different fitness values for cells in an environment that randomly switches between the two conditions. We compare the behavior of two cell types, one that can sense the environmental condition and one that cannot. In fast changing environments both cell types evolve to be as noisy as possible while maintaining bistability of the toggle switch. In slowly changing environments, evolved nonsensing cells are less noisy while sensing cells evolve the same noise level as in fast changing environments. Sensing removes the need of genotypic changes to adapt to changes in the environment fluctuation rate, providing an evolutionary advantage in unpredictable environments.

关键词： Cells

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BOOMERANG-BO3 observations of CMB anisotropy and polarization 41

BOOMERANG-BO3 observations of CMB anisotropy and polarizatio...

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41st Rencontres de Moriond on Cosmology: Contents and Structures of the Universe 2006

作者： Bernardis, P. De Ade, P.A.R. Bock, J.J. Bond, J.R. Borrill, J. Boscaleri, A. Cabella, P. Contaldi, C.R. Crill, B.P. Gasperis, G. De Oliveira-Costa, A. De Ivoia, G. De Stefano, G. Di Ehlers, P. Hivon, E. Hristov, V. Iacoangeli, A. Jaffe, A.H. Jones, W.C. Kisner, T.S. Lange, A.E. MacTavish, C.J. Bettolo, C. Marini Masi, S. Mason, P. Mauskopr, P.D. Melchiorri, A. Montroy, T.E. Nati, F. Nati, L. Natoli, P. Netterfield, C.B. Pascale, E. Piacentini, F. Pogosyan, D. Polenta, G. Prunet, S. Ricciardi, S. Romeo, G. Ruhl, J.E. Santini, P. Tegmark, M. Torbet, E. Veneziani, M. Vittorio, N. Dipartimcnto di Fisica Universita' di Roma la Sapienza Roma Italy School of Physics and Astronomy Cardiff University United Kingdom Jet Propulsion Laboratory PasadenaCA United States University of Toronto TorontoON Canada Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA United States Space Sciences Laboratory University of California BerkeleyCA United States IF AC-CNR Firenze Italy Dipartimcnto di Fisica Universita' di Roma Tor Vergata Roma Italy Department of Physics Imperial College London United Kingdom Infrared Processing and Analysis Center California Institute of Technology PasadenaCA United States Department of Physics Massachusetts Institute of Technology CambridgeMA United States Istituto Nazionqle di Geo Fisica e Vulcanologia Roma Italy Department of Astronomy and Astrophysics University of Toronto TorontoON Canada Department of Physics California Institute of Technology PasadenaCA United States Physics Department Case Western Reserve University ClevelandOH United States Department of Physics University of California Santa BarbaraCA United States Department of Physics University of Toronto TorontoON Canada IN FN Sezione di Roma 2 Roma Italy Department of Physics University of Alberta EdmontonAB Canada Institut d' Astrophysique de Paris Paris France INFN Sezione di Roma 1 Roma Italy

The BOOMERANg-B03 experiment has performed three surveys (deep, shallow, galactic) of selected regions of the southern sky. Maps of the Stores parameters I. Q, U at 145, 245, 345 GHz have been obtained, covering several hundreds of square degrees, with a resolution of ~ 10'. In the deep and shallow surveys, both at high Galactic: Latitudes, the 1 45 GHz I map is dominated by CMB anisotropy. The angular power spectrum cj 1 is consistent with previous measurements from BOOMERanG-B98 . with extended multipoles range and improved precision. A polarized CMB component is detected in the deep survey. The level and shape of cjE and cfE are consistent with the CMB polarization expected in the adiabatic inflationary model best fitting the c7r. Foregrounds are shown to be negligible in the deep survey at 145 GHz. © Copyright 2006 by Rencontres de Moriond.

关键词： Anisotropy

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The Building of Galactic Disks: Insights from the Triangulum Spiral Galaxy Messier 33

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Proceedings of the International Astronomical Union 2006年第S235期2卷 29-35页

作者： David L. Block Ivânio Puerari Giovanni G. Fazio Alan Stockton Gabriela Canalizo Kenneth C. Freeman Thomas H. Jarrett Françoise Combes Robert Groess Guy Worthey Anglo American Cosmic Dust Laboratory School of Computational and Applied Mathematics University of Witwatersrand Johannesburg 2050 South Africa email: block@cam.wits.ac.za Instituto Nacional de Astrofísica Optica y Electrónica Tonantzintla 72840 México email: puerari@inaoep.mx Harvard-Smithsonian Center for Astrophysics 60 Garden St. Cambridge MA 02138 USA email: gfazio@cfa.harvard.edu Institute for Astronomy University of Hawaii 2680 Woodlawn Drive Honolulu Hawaii USA email: stockton@ifa.hawaii.edu Institute of Geophysics and Planetary Physics and Department of Physics University of California Riverside CA 92521 USA Mount Stromlo and Siding Spring Observatories Research School of Astronomy and Astrophysics Australian National University Australia email: kcf@mso.anu.edu.au Infrared Processing and Analysis Centre 100-22 CALTECH 770 South Wilson Ave Pasadena CA 91125 USA email: jarrett@ipac.caltech.edu Observatoire de Paris LERMA 61 Av. de l'Observatoire F-75014 Paris France email: francoise.combes@obspm.fr Washington State University 1245 Webster Hall Pullman WA 99163-2814 USA email: gworthey@wsu.edu

The Triangulum Spiral Galaxy Messier 33 offers unique insights into the building of a galactic disk. We identify spectacular arcs of intermediate age (0.6 Gyr − 2 Gyr) stars in the low-metallicity outer disk. The northern arc spans ~120 degrees in azimuth and up to 5 arcmin in width. The arcs are located 2-3 disk scale lengths from the galaxy centre (where 1 disk scale length is equivalent to 0.1 degrees in the V-band) and lie precisely where there is a warp in the HI profile of M33. Warps and infall are inextricably linked (Binney, 1992). We present spectroscopy of candidate stars in the outer northern arc, secured using the Keck I telescope in Hawaii. The target stars have estimated visual magnitudes as faint as V~ 25m. Absorption bands of CN are seen in all spectra reported in this review talk, confirming their carbon star status. Also presented are PAH emissivity radial profiles generated from IRAC observations of M33 using the Spitzer Space Telescope. A dramatic change of phase in the m = 2 Fourier component is detected at the domain of the arcs. M33 serves as an excellent example how the disks of spiral galaxies in our Universe are built: as dynamically open systems, growing from the inward, outward.

关键词： galaxies: evolution – galaxies: spiral – galaxies: individual (M33 = NGC598)

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Shielding technology and the bush initiative - Shielding for lunar and martian missions

Shielding technology and the bush initiative - Shielding for...

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AIAA Space 2005 Conference and Exposition

作者： Thibeault, Sheila A. Wilson, John W. Clowdsley, Martha S. Kiefer, Richard L. Orwoll, Robert A. Boone, Amanda Hu, Lucy Y. Huttenhower, Hillary A. Besal, Barbara H. Schulz, Meghan E. Yang, Sha O'Neill, Christopher A. Miller, Adriane K. NASA Langley Research Center Hampton VA 23681 College of William and Mary Williamsburg VA 23185 Advanced Materials and Processing Branch Mail Stop 226 Computational Structures and Materials Branch Mail Stop 388 Department of Chemistry Department of Physics

ISBN: (纸本)1563477386

Past space missions beyond the confines of Earth's protective magnetic field have been of short duration, and protection from the effects of solar particle events was of primary concern. Aluminum alloy structures provided sufficient protection to meet requirements to prevent early radiation syndrome and were further successfully employed as protection against trapped protons in low Earth orbit (LEO). Aluminum alloys have been the materials of choice for the first 40 years of the space program. The extension of operations beyond LEO to enable routine access to other interesting regions of space will require protection from the hazards of the accumulated exposures of Galactic Cosmic Rays (GCR), and efficient fragmentation of GCR ions with minimal production of secondary particles in shielding materials is essential to protecting the astronauts. Aliphatic polymer composites are the most efficient structural materials exhibiting significantly improved radiation shielding properties, but they are limited in meeting the requirements of the service environment. Aromatic polymer composites developed mainly for high-speed aircraft applications have improved thermal-mechanical properties over aluminum alloys, as well as improved radiation shielding performance. Aliphatic/aromatic hybrid polymers are being developed to give a range of thermal-mechanical properties. The development of functionally graded structures will provide optimum solutions to multifunctional materials requirements in the near-term space program, with far-term utility.

关键词： Magnetic shielding

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