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  • 1
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    Coupled commensurate charge density wave and lattice distortion in Na_{2} Ti_{2} Pn_{2} O(Pn=As,Sb) determined by x-ray diffraction and angle-resolved photoemission spectroscopy (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-09-21
    Description: Author(s): N. R. Davies, R. D. Johnson, A. J. Princep, L. A. Gannon, J.-Z. Ma, T. Qian, P. Richard, H. Li, M. Shi, H. Nowell, P. J. Baker, Y. G. Shi, H. Ding, J. Luo, Y. F. Guo, and A. T. Boothroyd We report single-crystal x-ray-diffraction measurements on Na 2 Ti 2 P n 2 O ( P n = As , Sb ) which reveal a charge superstructure that appears below the density wave transitions previously observed in bulk data. From symmetry-constrained structure refinements we establish that the associated distortion mode can … [Phys. Rev. B 94, 104515] Published Mon Sep 19, 2016
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Effects of breeding density, feeding cycle, and light environment on the artificial culture of Poecilobdella manillensis (2020)
    Details
    Publication Date: 2021-05-19
    Description: To provide a scientific basis for artificial culture, the effects of different breeding densities, feeding cycles, and light environments on the growth regulation of Poecilobdella manillensis were studied. After P. manillensis were cultured at breeding densities of 250 ~ 3250 leeches m-2; feeding cycles of 2 ~ 16 days; and a light environment with noise or a light-free environment without noise, the weight gain rate (RWG), specific growth rate (SGR), feed conversion rate (FCR), and total content of the effective component (TCEC) were measured for 64 days. The results showed that the RWG and SGR presented the same growth indexes, which decreased with the increase in breeding density and the lengthening of the feeding cycle. In the light environment, the RWG and SGR of P. manillensis were lower than in the dark environment. The TCEC of groups 2 d and 4 d were significantly higher than in the other feeding cycle experiment groups. From these results, we advise that the optimal breeding density for artificial culture is 1750 leeches m-2 and the feeding cycle is 4 days; in the dark and quiet environment, P. manillensis grew better.
    Description: Published
    Keywords: Poecilobdella manillensis ; Artificial culture ; Growth rate ; Feed conversion rate ; Annelida ; Breeding
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.775-789
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  • 3
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    The Status and Interconnections of Selected Environmental Issues in the Global Coastal Zones: Problem of Increasing Vulnerability (2005)
    Details
    Publication Date: 2021-05-19
    Description: This study focuses on assessing the state of population distribution, land cover distribution, biodiversity hotspots and protected areas in global coastal zones. The coastal zone is defined as land within 100 km of the coastline. This study attempts to answer such questions as: how crowded are the coastal zones, what is the pattern of land cover distribution in these areas, how many of these areas are designated as protected areas, and what is the state of the biodiversity hotspots. This study uses globally consistent and comprehensive geo-spatial data sets based on remote sensing and other sources. The application of modern Geographic Information System (GIS) layering methods and consistent data sets has made it possible to identify and quantify selected coastal zones environmental issues and their interconnections. It is expected that such information provide a scientific basis for global coastal zones management and assist in policy formulations at the national and international levels.
    Description: UDEP,NASA,USGS
    Keywords: Coastal zone ; Biodiversity
    Repository Name: AquaDocs
    Type: Conference Material , Non-Refereed , Paper
    Format: 270347 bytes
    Format: application/pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Melting thermodynamics of organic nanocrystals (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 2176-2180 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The size-dependent melting temperature and the size-dependent melting entropy of organic nanocrystals are predicted by use of our simple model being free of any adjustable parameter. The model predictions for the size-dependent melting temperature and the size-dependent melting entropy are supported by the experimental results on benzene, chlorobenzene, heptane, and naphthalene nanocrystals. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479489
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  • 5
    Electronic Resource
    Electronic Resource
    A monolithic nonlinear transmission line system for the experimental study of lattice solitons (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2558-2564 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a new method, applying molecular beam epitaxial (MBE) growth and microfabrication techniques, to experimentally model nonlinear phenomena. Specifically, we have built a periodically loaded monolithic nonlinear transmission line which has been fabricated on a specially designed MBE GaAs wafer to duplicate a theoretical physics model, the one-dimensional exponential lattice, which was proposed by Toda. An advantage of the current approach over previous lumped element circuits is that it precisely reproduces the physics of the model without depending upon mathematical manipulations and corrections. To accomplish this, the line capacitance and parasitic capacitance were canceled by proper design of the MBE wafer profile. The conditions required to apply this approach to other nonlinear systems have also been studied. The experimentally measured pulse shapes for the Toda soliton system were compared against calculated results, with good agreement. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360113
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication and temperature dependence of the resistance of single-crystalline Bi nanowires (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3847-3851 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystalline Bi nanowires with diameters ranging from 20 to 70 nm were prepared by electrodeposition using nanoporous aluminum oxide membranes rather than the more usual track-etched polycarbonate membranes. X-ray diffraction and selected area electron diffraction investigations revealed that the nanowires are essentially single crystalline and highly oriented. The temperature dependence of zero-field resistance of different diameter nanowires indicated that these Bi nanowires undergo a semimetal–semiconductor transition due to two-dimensional quantum confinement effects. The resistance maximum was observed at 50 K in zero magnetic field for 20 nm Bi nanowires, while the resistance minimum at 258 K for 50 nm Bi nanowires, due to the quantum size effect. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1352562
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  • 7
    Electronic Resource
    Electronic Resource
    Annealed Co thin films: Pit formation and magnetic anisotropy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6095-6097 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a study of the morphological and magnetic transformation of hcp(0001) Co thin films, grown via sputtering on Al2O3(112¯0), which occurs when they are annealed in vacuum in the temperature range of 500 °C〈TA〈600 °C. In this temperature range, the films undergo a reentrant smoothening transition. For very thin films (thickness t〈20 nm), this coincides with a fcc(111) to fcc(001) recrystallization, and with the appearance of rectangular pits. For thicker films, the recrystallization does not occur, even though the surface smoothens out leaving hexagonal pits behind. The number of pits per unit area decreases exponentially as the thickness of the film is increased, demonstrating that interactions at the film surface and film–substrate interface cause the smoothening and pit formation during the annealing process. Whereas the hcp(0001) and fcc(111) phases are magnetically isotropic in the film's plane, the fcc(001) films exhibit a biaxial in-plane anisotropy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372620
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  • 8
    Electronic Resource
    Electronic Resource
    Dissociative chemisorption of nitrogen on Ru(0001) (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9248-9254 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dissociative chemisorption of nitrogen on clean and cesiated Ru(0001) surfaces has been studied using high-resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). N2 (at 300 K) chemisorbs dissociatively with a sticking coefficient of 2×10−6, independent of substrate temperature which was varied between 420 and 700 K. The saturation coverage is found at 0.5 monolayer. The energy of the N–Ru stretching vibration is 71 meV at the bare surface and 69 meV at the cesiated Ru(0001) surface. The activation energy for desorption is about 190 kJ/mol for small coverages. The kinetic data suggest the existence of an activation barrier in the entrance channel of adsorption. Preadsorption of 0.08 monolayer of Cs increases the sticking coefficient only by a factor of 1.3, and the maximum amount of adsorbed N is reduced due to blocking of adsorption sites through Cs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465541
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of annealing on superconductivity of Pb-doped Bi-Sr-Ca-Cu-O single-crystal superconductors (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1693-1695 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure of high quality Pb-doped Bi2Sr2CaCu2Ox single crystals grown by the flux technique has been studied by transmission electron microscopy (TEM). The single crystals have a superconducting transition temperature (Tc) of about 90 K as grown; Tc drops to about 83 K after annealing in air at 600 °C. TEM results show that the as-grown crystals exhibit twinning. The twin boundaries were found to be parallel to the (100) and (010) lattice planes. However, upon annealing the twin structure disappeared. This microstructure change is discussed in terms of a possible cause for the Tc decrease in the annealed crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104139
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  • 10
    Electronic Resource
    Electronic Resource
    Aggregation and permeation of 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran molecules in Alq (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 1122-1124 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The morphologic and luminescent behaviors of various 4-(dicyanomethylene)-2methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) containing films have been investigated. This involves pure DCM layers deposited on top of a tris-(8-hydroxyquinoline) aluminum (Alq) layer or positioned between two Alq layer, DCM-doped Alq films, and periodically arranged Alq/DCM multilayer structures. The occurrence over a period of time of aggregation and permeation of DCM molecules at room temperature and at temperatures as low as ∼260 K is found in all the cases studied. Such a phenomenon will result in degradation of related organic light-emitting devices and is closely related to the electric polarity of the DCM molecule. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1497438
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