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  • ASTRONOMY  (35)
  • SPACECRAFT INSTRUMENTATION  (6)
  • 42.10  (1)
  • Earth Sciences  (1)
  • JEL classification: J12  (1)
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  • 1
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    Saline water intrusion from deep artesian sources in McGregor Isles area of Lee County, Florida (2021)
    Florida Geological Survey | Tallahassee, FL
    In:  http://aquaticcommons.org/id/eprint/1206 | 3 | 2011-09-29 20:58:25 | 1206 | Florida Geological Survey
    Details
    Publication Date: 2021-07-06
    Description: Upward leakage of saline water from an artesian aquifer below 1,500 feethas caused an increase in chloride concentration in the lower Hawthorn aquiferfrom less than 1,000 mg/1 (milligrams per liter) to values ranging from about1,300 to 15,000 mg/1. Similarly the higher temperatures of the intruding waterhas caused an increase in water temperatures in the aquifer from 82"F to valuesranging from 83 to 93"F. The intruding water moves upward either through theopen bore hole of deep wells or test holes, or along a fault or fracture system,which has been identified in the area. From these points of entry into the lowerHawthorn aquifer, the saline water spreads laterally toward the south andsoutheast, but is generally confined to components of the fault system.The saline water moves upward from the lower Hawthorn aquifer into theupper Hawthorn aquifer through the open bore hole of wells, which connect theaquifers. This movement has resulted in an increase in chloride from less than200 mg/1 in the unaffected parts of the upper Hawthorn aquifer to valuescommonly ranging from about 300 to more than 3,000 mg/1 in parts of theaquifer affected by upward leakage. The upper Hawthorn aquifer is the principalsource of ground-water supply for public water-supply systems in western LeeCounty.Similar effects have been noted in the water-table aquifer, where chlorideincreased from less than 100 to concentrations ranging from about 500 to morethan 5,000 mg/1. This was caused by the downward infiltration of waterdischarged at land surface from wells tapping the lower Hawthorn aquifer.The spread of saline water throughout most of the McGregor Isles area iscontinuing as of 1971.(40 page document)
    Keywords: Oceanography ; Limnology ; Earth Sciences ; saline intrustion ; Florida ; Lee County
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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    PAPER (OA)
  • 2
    Electronic Resource
    Electronic Resource
    Nonlinear optical processes (1982)
    Springer
    Applied physics 29 (1982), S. 159-160 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688658
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Family structure, economic status, and educational attainment (1998)
    Springer
    Journal of population economics 11 (1998), S. 205-222 
    Details
    ISSN: 1432-1475
    Keywords: JEL classification: J12 ; I20 ; I30 ; Key words: Family structure ; education ; income
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract. This study examines the effect of family structure on high school graduation by race and gender using data from the first twenty-one waves of the Panel Study of Income Dynamics and recently available retrospective marital histories. The nature of the data allows for a more complete specification of family structure than has been heretofore possible. The analysis tests the hypothesis that the negative effect on educational attainment often associated with living in a mother-only or stepfather family stems primarily from the reduced level of economic resources available to these households. Empirical findings indicate that living with a widowed, divorced, or separated mother has little or no effect on educational attainment once we control for economic status. However, living in a stepfather family appears to have a persistent negative effect on high school graduation rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001480050065
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    Paper (German National Licenses)
    Fulltext
  • 4
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    COBE diffuse infrared background experiment observations of Galactic reddening and stellar populations (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This Letter describes the results of an initial study of Galactic extinction and the colors of Galactic stellar populations in the near-IR using the Diffuse Infrared Background Experiment (DIRBE) aboard the Cosmic Background Explorer (COBE) spacecraft. The near-IR reddening observed by DIRBE is consistent with the extinction law tabulated by Rieke & Lebofsky (1985). The distribution of dust and stars in most of the first and fourth quadrants of the Galactic plane (0 deg less than l less than 90 deg, and 270 deg less than l less than 360 deg, respectively) can be modeled as a stellar background source seen through up to approximately 4 mag of extinction at 1.25 micrometers. The unreddened near-IR colors of the Galactic disk are similar to those of late-K and M giants. The Galactic bulge exhibits slightly bluer colors in the 2.2-3.5 micrometers range, as noted by Terndrup et al. (1991). Star-forming regions exhibit colors that indicate the presence of a approximately 900 K continuum produced by hot dust or polycyclic aromatic hydrocarbons (PAHs) contributing at wavelengths as short as 3.5 micrometers.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 425; 2; p. L85-L88
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The Goddard High Resolution Spectrograph: Instrument, goals, and science results (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Goddard High Resolution Spectrograph (GHRS), currently in Earth orbit on the Hubble Space Telescope (HST), operates in the wavelength range 1150-3200 A with spectral resolutions (lambda/delta lambda) of approximately 2 x 10(exp 3), 2 x 10(exp 4), and 1 x 10(exp 3). The instrument and its development from inception, its current status, the approach to operations, representative results in the major areas of the scientific goals, and prospects for the future are described.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 106; 702; p. 890-908
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The Hubble Space Telescope (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Hubble Space Telescope was launched from the Kennedy Space Center on April 24, 1990. Its initial check-out indicates that all sub-systems of the satellite are working very well, with two key exceptions: The line-of-sight pointing is subject to occasional jitter apparently induced by thermal stresses in the solar arrays; this is expected to be overcome. The telescope mirrors are found to contain approximately 0.5 wave rms of spherical aberration which cannot be overcome by any controls on board the satellite. This defect will limit the scientific performance of the telescope in the short run. However, the aberration can be fully corrected in the optical designs of future replacement instruments, and the delivery schedules of these instruments are being accelerated.
    Keywords: ASTRONOMY
    Type: In: Observatories in earth orbit and beyond (A93-23401 07-89); p. 3-7.
    Format: text
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  • 7
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    The High Resolution Spectrograph for the Space Telescope (1982)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: The High Resoltuion Spectrograph (HRS) in conjunction with the Space Telescope (ST), extends ultraviolet astronomical spectroscopy to higher spectra, spatial, and time resolutions than previously achieved, as well as to fainter and more distant celestial objects. Other significant advances inherent in the instrument are high photometric accuracy and efficient operation via exposure meter control and real time rejection of bad data. These capabilities are provided to accomplish the scientific programs of the HRS investigation definition team, which concern the interstellar medium, stellar winds, and evolutionary aspects of stellar atmosphere studies; the determination of chemical abundances relevant to stellar evolution; the investigation of quasars and Seyfert galaxy nuclei; and the analysis of the atmospheres of solar system objects, including comets.
    Keywords: ASTRONOMY
    Type: Space Telescope Science Inst. The Space Telescope Obs.; p 76-105
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    COBE DIRBE near-infrared polarimetry of the zodiacal light: Initial results (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This Letter describes near-infrared polarimetry of the zodiacal light at 2.2 micrometers, measured with the Diffuse Infrared Background Experiment (DIRBE) aboard the Cosmic Background Explorer (COBE) spacecraft. The polarization is due to scattering of sunlight. The polarization vector is perpendicular to the scattering plane, and its observed amplitude on the ecliptic equator at an elongation of 90 deg and ecliptic longitude of 10 deg declines from 12.0 +/- 0.4% at 1.25 micrometers to 8.0 +/- 0.6% at 3.5 micrometers (cf. 16% in the visible); the principal source of uncertainty is photometric noise due to stars. The observed near-infrared colors at this location are redder than Solar, but at 3.5 micrometers this is due at least in part to the thermal emission contribution from the interplanetary dust. Mie theory calculations show that both polarizations and colors are important in constraining models of interplanetary dust.
    Keywords: ASTRONOMY
    Type: The Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 431; 1; p. L63-L66
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Early results from the Cosmic Background Explorer (COBE) (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Data obtained with the FIR Absolute Spectrophotometer, Differential Microwave Radiometers, and Diffuse IR Background Experiment (DIRBE) on the COBE satellite since its launch in November 1989 are briefly characterized. The COBE spacecraft and its 900-km 99-deg orbit are described; the scientific goals and capabilities of the instruments are reviewed; and sample DIRBE data are presented in a map and graph. Upper limits on the Comptonization parameter (y less than 0.001) and the chemical potential (mu less than 0.01 at the 3sigma level) are determined, and the spectrum of the dipole anisotropy is shown to be that of a Doppler-shifted blackbody. The DIRBE 100-micron sky brightness values at the ecliptic poles are found to be significantly lower than those measured by IRAS.
    Keywords: ASTRONOMY
    Type: Advances in Space Research (ISSN 0273-1177); 11; 2, 19; 181-191
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    NASA TECHNICAL REPORTS
  • 10
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    Second generation spectrograph for the Hubble Space Telescope (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The preliminary design for the Space Telescope Imaging Spectrograph (STIS), which has been selected by NASA for definition study for future flight as a second-generation instrument on the Hubble Space Telescope (HST), is presented. STIS is a two-dimensional spectrograph that will operate from 1050 A to 11,000 A at the limiting HST resolution of 0.05 arcsec FWHM, with spectral resolutions of 100, 1200, 20,000, and 100,000 and a maximum field-of-view of 50 x 50 arcsec. Its basic operating modes include echelle model, long slit mode, slitless spectrograph mode, coronographic spectroscopy, photon time-tagging, and direct imaging. Research objectives are active galactic nuclei, the intergalactic medium, global properties of galaxies, the origin of stellar systems, stelalr spectral variability, and spectrographic mapping of solar system processes.
    Keywords: SPACECRAFT INSTRUMENTATION
    Format: text
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