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  • Articles  (95)
  • Physics  (95)
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  • Articles  (95)
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  • 1
    Electronic Resource
    Electronic Resource
    Frequency Selective Surfaces with Anisotropic Dielectric Superstrates (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 461-475 
    Details
    ISSN: 1572-9559
    Keywords: frequency selective surfaces ; FSS ; dielectric anisotropy ; anisotropic superstrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A full wave analysis is developed for frequency selective surfaces composed of rectangular patches mounted on a dielectric anisotropic substrate and covered with a uniaxial anisotropic superstrate. The moment method is used in combination with the spectral domain immittance approach to determine the FSS structure reflection and transmission coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006615316368
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  • 2
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    Residual entropy and waterlike anomalies in the repulsive one dimensional lattice gas (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-04-14
    Description: The thermodynamics and kinetics of the one dimensional lattice gas with repulsive interaction are investigated using transfer matrix technique and Monte Carlo simulations. This simple model is shown to exhibit waterlike anomalies in density, thermal expansion coefficient, and self-diffusion. An unified description for the thermodynamic anomalies in this model is achieved based on the ground state residual entropy which appears in the model due to mixing entropy in a ground state phase transition.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    A survey of extended H2 emission from massive YSOs (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-28
    Description: We present the results from a survey, designed to investigate the accretion process of massive young stellar objects (MYSOs) through near-infrared narrow-band imaging using the H 2 =1–0 S(1) transition filter. A sample of 353 MYSO candidates was selected from the Red MSX Source survey using photometric criteria at longer wavelengths (infrared and submillimetre) and chosen with positions throughout the Galactic plane. Our survey was carried out at the Southern Astrophysical Research Telescope Telescope in Chile and Canada–France–Hawaii Telescope in Hawaii covering both hemispheres. The data reveal that extended H 2 emission is a good tracer of outflow activity, which is a signpost of accretion process on young massive stars. Almost half of the sample exhibit extended H 2 emission and 74 sources (21 per cent) have polar morphology, suggesting collimated outflows. The polar-like structures are more likely to appear on radio-quiet sources, indicating these structures occur during the pre-UCH ii phase. We also found an important fraction of sources associated with fluorescent H 2 diffuse emission that could be due to a more evolved phase. The images also indicate only ~23 per cent (80) of the sample is associated with extant (young) stellar clusters. These results support the scenario in which massive stars are formed by accretion discs, since the merging of low-mass stars would not produce outflow structures.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 4
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    Total variation regularization for depth-to-basement estimate: Part 1 — Mathematical details and applications (2011)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2011-01-01
    Description: We have developed an inversion approach that estimates the basement relief of a fault-bounded sedimentary basin. The sedimentary pack is approximated by a grid of 3D or 2D vertical prisms juxtaposed in the horizontal directions of a right-handed coordinate system. The prisms' thicknesses represent the depths to the basement and are the parameters to be estimated from the gravity data. To obtain depth-to-basement estimates, we introduce the total variation (TV) regularization as a stabilizing function. This approach lets us estimate a nonsmooth basement relief because it does not penalize sharp features of the solution. We have deduced a compact matrix form of the gradient vector and the Hessian matrix of the approximation to the TV function that allows a regularized Gauss-Newton minimization approach. Because the Hessian matrix of the approximation to the TV function is ill conditioned, we have modified this Hessian matrix to improve its condition and to accelerate the convergence of the Gauss-Newton algorithm. Tests conducted with synthetic data show that the inversion method can delineate discontinuous basements presenting large slips or sequences of small-slip step faults. Tests on field data from the Almada Basin, Brazil, and from the San Jacinto Graben, California, U.S.A., confirm the potential of the method in detecting and locating in-depth normal faults in the basement relief of a sedimentary basin.
    Print ISSN: 0016-8033
    Electronic ISSN: 1942-2156
    Topics: Geosciences , Physics
    Published by Society of Exploration Geophysicists (SEG)
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  • 5
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    Support for a colleague (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-03-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alatalo, R V -- Aragon, S -- Aviles, J M -- Barbosa, A -- Gomes, C Bessa -- Cadee, N -- Christe, P -- Cuervo, J J -- Diaz, M -- Erritzoe, J -- Galeotti, P -- Garamszegi, L Z -- Gil, D -- Gontard-Danek, M -- Legendre, S -- Martin, T E -- Martinez, J -- Martin-Vivaldi, M -- Martinez, J G -- Merino, S -- Moreno, J -- Mousseau, Tim -- Ninni, P -- Petrie, M -- Pulido, F -- Rubolini, D -- Saino, N -- Soler, J J -- Soler, M -- Spottiswoode, C -- Szep, T -- Thornhill, R -- Zamora, C -- Sacchi, Roberto -- New York, N.Y. -- Science. 2004 Mar 12;303(5664):1612.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15016981" target="_blank"〉PubMed〈/a〉
    Keywords: *Ecology ; Publishing ; *Scientific Misconduct
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    The neurotrophic factor receptor RET drives haematopoietic stem cell survival and function (2014)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2014-08-01
    Description: Haematopoiesis is a developmental cascade that generates all blood cell lineages in health and disease. This process relies on quiescent haematopoietic stem cells capable of differentiating, self renewing and expanding upon physiological demand. However, the mechanisms that regulate haematopoietic stem cell homeostasis and function remain largely unknown. Here we show that the neurotrophic factor receptor RET (rearranged during transfection) drives haematopoietic stem cell survival, expansion and function. We find that haematopoietic stem cells express RET and that its neurotrophic factor partners are produced in the haematopoietic stem cell environment. Ablation of Ret leads to impaired survival and reduced numbers of haematopoietic stem cells with normal differentiation potential, but loss of cell-autonomous stress response and reconstitution potential. Strikingly, RET signals provide haematopoietic stem cells with critical Bcl2 and Bcl2l1 surviving cues, downstream of p38 mitogen-activated protein (MAP) kinase and cyclic-AMP-response element binding protein (CREB) activation. Accordingly, enforced expression of RET downstream targets, Bcl2 or Bcl2l1, is sufficient to restore the activity of Ret null progenitors in vivo. Activation of RET results in improved haematopoietic stem cell survival, expansion and in vivo transplantation efficiency. Remarkably, human cord-blood progenitor expansion and transplantation is also improved by neurotrophic factors, opening the way for exploration of RET agonists in human haematopoietic stem cell transplantation. Our work shows that neurotrophic factors are novel components of the haematopoietic stem cell microenvironment, revealing that haematopoietic stem cells and neurons are regulated by similar signals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fonseca-Pereira, Diogo -- Arroz-Madeira, Silvia -- Rodrigues-Campos, Mariana -- Barbosa, Ines A M -- Domingues, Rita G -- Bento, Teresa -- Almeida, Afonso R M -- Ribeiro, Helder -- Potocnik, Alexandre J -- Enomoto, Hideki -- Veiga-Fernandes, Henrique -- England -- Nature. 2014 Oct 2;514(7520):98-101. doi: 10.1038/nature13498. Epub 2014 Jul 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Instituto de Medicina Molecular, Faculdade de Medicina de Lisboa, Avenida Professor Egas Moniz, Edificio Egas Moniz, 1649-028 Lisboa, Portugal [2]. ; Instituto de Medicina Molecular, Faculdade de Medicina de Lisboa, Avenida Professor Egas Moniz, Edificio Egas Moniz, 1649-028 Lisboa, Portugal. ; 1] Division of Molecular Immunology, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK [2] Institute of Immunology and Infection Research, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK. ; 1] Laboratory for Neuronal Differentiation and Regeneration, RIKEN Center for Developmental Biology, Kobe 650-0047, Japan [2] Graduate School of Medicine, Kobe University7-5-1 Kusunoki-cho, Chuo-ku, Kobe City, Hyogo 650-0017, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25079320" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Survival ; Cyclic AMP Response Element-Binding Protein/metabolism ; Enzyme Activation ; Female ; Hematopoiesis ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells/*cytology/*metabolism ; Humans ; Male ; Mice ; Mice, Inbred C57BL ; Nerve Growth Factors/*metabolism ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Proto-Oncogene Proteins c-ret/deficiency/genetics/*metabolism ; Signal Transduction ; Stem Cell Niche ; bcl-X Protein/metabolism ; p38 Mitogen-Activated Protein Kinases/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 7
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    Three-color entanglement (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-09-19
    Description: Entanglement is an essential quantum resource for the acceleration of information processing as well as for sophisticated quantum communication protocols. Quantum information networks are expected to convey information from one place to another by using entangled light beams. We demonstrated the generation of entanglement among three bright beams of light, all of different wavelengths (532.251, 1062.102, and 1066.915 nanometers). We also observed disentanglement for finite channel losses, the continuous variable counterpart to entanglement sudden death.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Coelho, A S -- Barbosa, F A S -- Cassemiro, K N -- Villar, A S -- Martinelli, M -- Nussenzveig, P -- New York, N.Y. -- Science. 2009 Nov 6;326(5954):823-6. doi: 10.1126/science.1178683. Epub 2009 Sep 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Fisica, Universidade de Sao Paulo, Post Office Box 66318, Sao Paulo, SP 05314-970, Brazil.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19762598" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Multiple liquid-liquid critical points and density anomaly in core-softened potentials (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-03-12
    Description: Author(s): Marco Aurélio A. Barbosa, Evy Salcedo, and Marcia C. Barbosa The relation between liquid-liquid phase transitions and waterlike density anomalies in core-softened potentials of fluids was investigated in an exactly solvable one-dimensional lattice model and in a three-dimensional fluid with a Fermi-like potential, the latter by molecular dynamics. Both system... [Phys. Rev. E 87, 032303] Published Mon Mar 11, 2013
    Keywords: Colloids and Complex Fluids
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Substituent-Modulated Conformation and Supramolecular Assembly of Tetronamides (2016)
    American Chemical Society (ACS)
    Details
    Publication Date: 2016-09-02
    Description: Crystal Growth & Design DOI: 10.1021/acs.cgd.6b00881
    Print ISSN: 1528-7483
    Electronic ISSN: 1528-7505
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by American Chemical Society (ACS)
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  • 10
    Electronic Resource
    Electronic Resource
    An x-ray gas position sensitive detector: Construction and characterization : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2315-2317 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A linear x-ray gas position sensitive detector with delay line readout has been constructed. The detector is described, characterized, and used for detecting x-ray diffraction patterns from polycrystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140750
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