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  • FLUID MECHANICS AND HEAT TRANSFER  (7)
  • INSTRUMENTATION AND PHOTOGRAPHY  (6)
  • Ateles  (3)
  • 2020-2024
  • 1985-1989  (13)
  • 1965-1969  (3)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Multiple central place foraging by spider monkeys: travel consequences of using many sleeping sites (1989)
    Springer
    Oecologia 79 (1989), S. 506-511 
    Details
    ISSN: 1432-1939
    Keywords: Multiple central place foragers ; Ateles ; Sleeping sites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Central place foraging models assume that animals return to a single central place such as a nest, burrow, or sleeping site. Many animals, however choose between one of a limited number of central places. Such animals can be considered Multiple Central Place Foragers (MCPF), and such a strategy could reduce overall travel costs, if the forager selected a sleeping site close to current feeding areas. We examined the selection of sleeping sites (central places) by a community of spider monkeys (Ateles geoffroyi) in Santa Rosa National Park, Costa Rica in relation to the location of their feeding areas. Spider monkeys repeatedly used 11 sleeping trees, and they tended to choose the sleeping site closest to their current feeding area. A comparison of the observed travel distances with distances predicted for a MCPF strategy, a single central place strategy, and a strategy of randomly selecting sleeping sites demonstrated (1) that the MCPF strategy entailed the lowest travel costs, and (2) that the observed travel distance was best predicted by the MCPF strategy. Deviations between the observed distance travelled and the values predicted by the MCPF model increased after a feeding site had been used for several days. This appears to result from animals sampling their home range to locate new feeding sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378668
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Social responses to the traumatic injury of a juvenile spider monkey (Ateles geoffroyi) (1987)
    Springer
    Primates 28 (1987), S. 271-275 
    Details
    ISSN: 0032-8332
    Keywords: Compensatory care ; Spider monkey ; Ateles ; Injury
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The behavioural development of a juvenile male spider monkey (Ateles geoffroyi) preceding and subsequent to a traumatic injury resulting in the loss of his tail, was documented over a nine-month period in Santa Rosa National Park, Costa Rica. The juvenile became heavily reliant on his mother, who readily provided compensatory care, including nursing the juvenile even though he had previously been weaned. In comparison to another juvenile male spider monkey of similar age, the development of the injured animal was severely retarded and even five months after the accident, the juvenile was still nursing and being carried by his mother. As injuries may be relatively common among primates it is suggested that the provision of compensatory care is an important trait in many primate species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382577
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Patterns of foraging and range use by three species of neotropical primates (1988)
    Springer
    Primates 29 (1988), S. 177-194 
    Details
    ISSN: 0032-8332
    Keywords: Foraging ; Range use ; Ateles ; Alouatta ; Cebus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper describes the diet and range use patterns of the three species of primates in Santa Rosa National Park, Costa Rica (Ateles geoffroyi, Alouatta palliata, andCebus capucinus) and examines the variation in these variables as they relate to seasonal changes and concomitant changes in food availability. These three primate species were studied over a four-year period for a total of 24 months in the field. Santa Rosa National Park is in an area that experiences a long severe dry season in which little if any rain falls and the majority of the non-riparian trees lose their leaves. However, even though the three species were very flexible in terms of diet and range use, the behavioural variability did not correspond to changes in food availability or season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02381121
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    Paper (German National Licenses)
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  • 4
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    Ground truth/sensor correlation (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Investigating remote sensing applications to simple geological features using microwave radiometers
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. MANNED SPACECRAFT CENTER STATUS REV., VOL. 2 1969 (SEE N71-11976 02-13)
    Format: text
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  • 5
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    Analytical and experimental investigations of low level acceleration measurement techniques (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Construction techniques for accelerometer with low level threshold sensitivity
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-78050 , RE-23
    Format: application/pdf
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  • 6
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    Superconducting suspension for a sensitive accelerometer. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-05-24
    Description: Permanent magnet suspension over superconducting surface used as linear bearing for low level accelerometer
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 7
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    Topological classification of flow separation on three-dimensional bodies (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In the study of three-dimensional, separated flows, a topological approach to separation and a phenomenological approach have been considered. The topological approach is based on ideas of Poincare (1928), while the phenomenological approach distinguishes between 'open' and 'closed' separation as posed by Wang (1974). In the present paper, the topological description provided by Legendre (1956, 1965, 1982) is considered, taking into account its utilization by Tobak and Peake (1979, 1982). An attempt is made to provide a more complete framework for the description of separated as well as attached flows. Nomenclature is introduced to describe the topology of the skin-friction-line portraits on a three-dimensional body. The topological ideas are illustrated by the use of hypothetical oil-flow experiments supplemented with actual flow-visualization data when possible.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 86-0485
    Format: text
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  • 8
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    Simulation and modeling of homogeneous, compressed turbulence (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Low Reynolds number homogeneous turbulence undergoing low Mach number isotropic and one-dimensional compression was simulated by numerically solving the Navier-Stokes equations. The numerical simulations were performed on a CYBER 205 computer using a 64 x 64 x 64 mesh. A spectral method was used for spatial differencing and the second-order Runge-Kutta method for time advancement. A variety of statistical information was extracted from the computed flow fields. These include three-dimensional energy and dissipation spectra, two-point velocity correlations, one-dimensional energy spectra, turbulent kinetic energy and its dissipation rate, integral length scales, Taylor microscales, and Kolmogorov length scale. Results from the simulated flow fields were used to test one-point closure, two-equation models. A new one-point-closure, three-equation turbulence model which accounts for the effect of compression is proposed. The new model accurately calculates four types of flows (isotropic decay, isotropic compression, one-dimensional compression, and axisymmetric expansion flows) for a wide range of strain rates.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-176939 , NAS 1.26:176939 , SU-TF-21
    Format: application/pdf
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  • 9
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    Hypersonic shock structure with Burnett terms in the viscous stress and heat flux (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The continuum Navier-Stokes and Burnett equations are solved for one-dimensional shock structure in various monatomic gases. A new numerical method is employed which utilizes the complete time-dependent continuum equations and obtains the steady-state shock structure by allowing the system to relax from arbitrary initial conditions. Included is discussion of numerical difficulties encountered when solving the Burnett equations. Continuum solutions are compared to those obtained utilizing the Direct Simulation Monte Carlo method. Shock solutions are obtained for a hard sphere gas and for argon from Mach 1.3 to Mach 50. Solutions for a Maxwellian gas are obtained from Mach 1.3 to Mach 3.8. It is shown that the Burnett equations yield shock structure solutions in much closer agreement to both Monte Carlo and experimental results than do the Navier-Stokes equations. Shock density thickness, density asymmetry, and density-temperature separation are all more accurately predicted by the Burnett equations than by the Navier-Stokes equations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 88-2733
    Format: text
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  • 10
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    A new rotational relaxation model for use in hypersonic computational fluid dynamics (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The theoretical basis for the Landau-Teller equation commonly used to model rotational nonequilibrium is reviewed. Several assumptions underlying this model are indicated to be unrealistic for rarefied hypersonic flow. A new rotational nonequilibrium model based on recent measurements up to 2000K of quantum state transition rates is presented. The new model is applied to the continuum study of normal shock wave structure using both the Burnett equations and a simplified nonlinear constitutive relation. Comparisons are made between shock wave temperature profiles generated from the new model and those generated using the Landau-Teller model. Comparisons of shock reciprocal thicknesses between experimental data for nitrogen and continuum solutions using both rotational models are made. The new rotational model agrees well with experiment up to Mach 6, and under predicts shock thickness at higher Mach numbers. The Landau-Teller model agrees well with experimental shock thickness up to Mach 3, and over predicts the thickness at higher Mach numbers. A modification to the rotational collision number in the Landau-Teller model is found to give results which agree with experimental shock thicknesses at all Mach numbers up to 11.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 89-1737
    Format: text
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