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  • DOCUMENTATION AND INFORMATION SCIENCE  (3)
  • Global change  (3)
  • Astrophysics
  • Mice
  • 2015-2019  (2)
  • 1990-1994  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Elevated CO2 and plant nitrogen-use: is reduced tissue nitrogen concentration size-dependent? (1993)
    Springer
    Oecologia 93 (1993), S. 195-200 
    Details
    ISSN: 1432-1939
    Keywords: Allometry ; C/N Balance ; Global change ; Nitrogen-use efficiency ; Physiological adjustments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plants often respond to elevated atmospheric CO2 levels with reduced tissue nitrogen concentrations relative to ambient CO2-grown plants when comparisons are made at a common time. Another common response to enriched CO2 atmospheres is an acceleration in plant growth rates. Because plant nitrogen concentrations are often highest in seedlings and subsequently decrease during growth, comparisons between ambient and elevated CO2-grown plants made at a common time may not demonstrate CO2-induced reductions in plant nitrogen concentration per se. Rather, this comparison may be highlighting differences in nitrogen concentration between bigger, more developed plants and smaller, less developed plants. In this study, we directly examined whether elevated CO2 environments reduce plant nitrogen concentrations independent of changes in plant growth rates. We grew two annual plant species. Abutilon theophrasti (C3 photosynthetic pathway) and Amaranthus retroflexus (C4 photosynthetic pathway), from seed in glass-sided growth chambers with atmospheric CO2 levels of 350 μmol·mol−1 or 700 μmol·mol−1 and with high or low fertilizer applications. Individual plants were harvested every 2 days starting 3 days after germination to determine plant biomass and nitrogen concentration. We found: 1. High CO2-grown plants had reduced nitrogen concentrations and increased biomass relative to ambient CO2-grown plants when compared at a common time; 2. Tissue nitrogen concentrations did not vary as a function of CO2 level when plants were compared at a common size; and 3. The rate of biomass accumulation per rate of increase in plant nitrogen was unaffected by CO2 availability, but was altered by nutrient availability. These results indicate that a CO2-induced reduction in plant nitrogen concentration may not be due to physiological changes in plant nitrogen use efficiency, but is probably a size-dependent phenomenon resulting from accelerated plant growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317671
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Will increases in atmospheric CO2 affect regrowth following grazing in C4 grasses from tropical grasslands? A test with Sporobolus kentrophyllus (1994)
    Springer
    Oecologia 99 (1994), S. 141-144 
    Details
    ISSN: 1432-1939
    Keywords: Africa ; Grazing ; Global change ; Grasslands ; Herbivory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We grew a C4 grass from the Serengeti ecosystem under ambient (370 ppm) and elevated (700 ppm) CO2, and under clipped and unclipped conditions to test whether regrowth following grazing would be affected by elevated CO2. Above-ground productivity was slightly decreased under elevated CO2, and was similar between clipped and unclipped plants. Regrowth (clipping offtake) following clipping was similar in the two CO2 treatments, and there was no CO2 by clipping interaction on biomass, productivity, or leaf nutrient concentrations. Based on this evidence, we suggest that C4 grasses from the Serengeti will show little direct response to future increases in atmospheric CO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317094
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  • 3
    Electronic Resource
    Electronic Resource
    Soil biology, soil ecology, and global change (1992)
    Springer
    Biology and fertility of soils 14 (1992), S. 104-111 
    Details
    ISSN: 1432-0789
    Keywords: Global change ; Scaling ; Hierarchies ; Soil organisms ; Soil processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This overview paper addresses aspects of scaling in space and time, and scaling in relation to micro-and macrohabitats. Ecological processes in soils are examined for possible generalizations about processes and organisms, across a wide range of different habitats. Problems of scaling in space and time that have an important impact on processes associated with global change are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336258
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  • 4
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    Storage needs in future supercomputer environments (1992)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: The Lawrence Livermore National Laboratory (LLNL) is a Department of Energy contractor, managed by the University of California since 1952. Major projects at the Laboratory include the Strategic Defense Initiative, nuclear weapon design, magnetic and laser fusion, laser isotope separation, and weather modeling. The Laboratory employs about 8,000 people. There are two major computer centers: The Livermore Computer Center and the National Energy Research Supercomputer Center. As we increase the computing capacity of LLNL systems and develop new applications, the need for archival capacity will increase. Rather than quantify that increase, I will discuss the hardware and software architectures that we will need to support advanced applications.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, NSSDC Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications, Volume 3; 13 p
    Format: text
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  • 5
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    Storage needs in future supercomputer environments (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: As the computing capacity of the Lawrence Livermore National Laboratory (LLNL) systems is increased and new applications are developed, the need for archival capacity will increase. The hardware and software architectures that will be needed to support advanced applications are discussed. Viewgraphs are included.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, Proceedings of the NSSDC Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications; p 276-295
    Format: application/pdf
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  • 6
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    Mass storage system reference model, Version 4 (1993)
    In:  Other Sources
    Details
    Publication Date: 2016-03-10
    Description: The high-level abstractions that underlie modern storage systems are identified. The information to generate the model was collected from major practitioners who have built and operated large storage facilities, and represents a distillation of the wisdom they have acquired over the years. The model provides a common terminology and set of concepts to allow existing systems to be examined and new systems to be discussed and built. It is intended that the model and the interfaces identified from it will allow and encourage vendors to develop mutually-compatible storage components that can be combined to form integrated storage systems and services. The reference model presents an abstract view of the concepts and organization of storage systems. From this abstraction will come the identification of the interfaces and modules that will be used in IEEE storage system standards. The model is not yet suitable as a standard; it does not contain implementation decisions, such as how abstract objects should be broken up into software modules or how software modules should be mapped to hosts; it does not give policy specifications, such as when files should be migrated; does not describe how the abstract objects should be used or connected; and does not refer to specific hardware components. In particular, it does not fully specify the interfaces.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, Goddard Conference on Mass Storage Systems and Technologies, Volume 1,; p 1-72
    Format: text
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  • 7
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    On the Persistence of QPOs During the SGR 1806-20 Giant Flare (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-07-09
    Description: The discovery of quasi-periodic brightness oscillations (QPOs) in the X-ray emission accompanying the giant flares of the soft gamma-ray repeaters SGR 180620 and SGR 1900+14 has led to intense speculation about their nature and what they might reveal about the interiors of neutron stars. Here we take a fresh look at the giant flare data for SGR 180620, and in particular we analyze short segments of the post-peak emission using a Bayesian procedure, which has not previously been applied to these data. We find at best weak evidence that any QPO persists for more than ~1 s; instead, almost all the data are consistent with a picture in which there are numerous independently excited modes that decay within a few tenths of a second. This has interesting implications for the rapidity of decay of the QPO modes, which could occur by the previously suggested mechanism of coupling to the MHD continuum. The strongest QPOs favor certain rotational phases, which might suggest special regions of the crust or of the magnetosphere. We also find several previously unreported QPOs in these data, which may help in tracking down their origin.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN68610 , The Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 871; 1; 95
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  • 8
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    A Search for High-Energy Counterparts to Fast Radio Bursts (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-11-30
    Description: We report on a search for high-energy counterparts to fast radio bursts (FRBs) with the Fermi Gamma-ray Burst Monitor, Fermi Large Area Telescope, and the Neil Gehrels Swift Observatory Burst Alert Telescope. We find no significant associations for any of the 23 FRBs in our sample, but report upper limits to the high-energy fluence for each on timescales of 0.1, 1, 10, and 100 s. We report lower limits on the ratio of the radio to high-energy fluence, f(sub r) /f(sub ), for timescales of 0.1 and 100 s. We discuss the implications of our non-detections on various proposed progenitor models for FRBs, including analogs of giant pulses from the Crab pulsar and hyperflares from magnetars. This work demonstrates the utility of analyses of high-energy data for FRBs in tracking down the nature of these elusive sources..
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN75257 , Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 879; 1; 40
    Format: text
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