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  • Biology
  • INSTRUMENTATION AND PHOTOGRAPHY
  • MACHINERY
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  • 1
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    Cosmic X-ray spectroscopy with multilayer optics (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Multilayer optics operated at normal incidence offer a powerful new technology for the study of the solar spectrum in the XUV. The spectra of most cosmic X-ray sources are strongly extinguished at wavelengths above 40 A due to absorption and scattering by interstellar grains. We describe a number of configurations which allow multilayer optics to be used at nonnormal angles of incidence in conjunction with grazing incidence optics to analyze the spectra of cosmic X-ray sources in the wavelength interval between 1.5 and 40 A. These optical configurations utilize both multilayer mirrors and gratings, and permit the efficient observation of extended sources using stigmatic spectrographs. The response of the instruments described to typical cosmic X-ray sources is also discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Multilayer and grazing incidence X-ray(EUV optics; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-39658 15-74); p. 333-344.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Thermoprobe - An instrument for determining the temperature of opaque, translucent, and transparent surfaces in the incandescent temperature range. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 43; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Improved burst disk/cutter assembly (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Burst disk/cutter, prewelded before assembly, eliminates external leakage into a vacuum annulus and provides a means for more accurate burst-pressure prediction. Two reverse buckling type configurations are described and test results are given.
    Keywords: MACHINERY
    Type: KSC-10516
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Monitoring Bearing Vibrations For Signs Of Damage (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Real-time spectral analysis of vibrations being developed for use in monitoring conditions of critical bearings in rotating machinery. Underlying concept simple and fairly well established: appearance and growth of vibrations at frequencies associated with rotations of various parts of bearing system indicate wear, damage, and imperfections of manufacture. Frequencies include fundamental and harmonics of frequency of rotation of ball cage, frequency of passage of balls, and frequency of rotation of shaft.
    Keywords: MACHINERY
    Type: MFS-29734 , NASA Tech Briefs (ISSN 0145-319X); 15; 12; P. 78
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Monitoring Engine Vibrations And Spectrum Of Exhaust (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Real-time computation of intensities of peaks in visible-light emission spectrum of exhaust combined with real-time spectrum analysis of vibrations into developmental monitoring technique providing up-to-the-second information on conditions of critical bearings in engine. Conceived to monitor conditions of bearings in turbopump suppling oxygen to Space Shuttle main engine, based on observations that both vibrations in bearings and intensities of visible light emitted at specific wavelengths by exhaust plume of engine indicate wear and incipient failure of bearings. Applicable to monitoring "health" of other machinery via spectra of vibrations and electromagnetic emissions from exhausts. Concept related to one described in "Monitoring Bearing Vibrations For Signs Of Damage", (MFS-29734).
    Keywords: MACHINERY
    Type: MFS-29733 , NASA Tech Briefs (ISSN 0145-319X); 15; 12; P. 79
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Blade-Tip-Clearance Forces in Turbines (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Study reviews field and proposes experiments. Report summarizes present knowledge and discusses plans for experiments on blade-tipclearance excitation forces in turbines. Of particular interest Alford forces, named after pioneering worker in this field. These are cross forces due to uneven clearances, which in turn caused by and also cause rotor vibrations. Because blade-tip clearances affect turbine efficiency and excitation forces affect rotor stability, report proves useful to researchers and designers of advanced turbomachinery.
    Keywords: MACHINERY
    Type: MFS-27122 , NASA Tech Briefs (ISSN 0145-319X); 11; 1; P. 67
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Colección de corales pétreos de Cuba. [Versión electrónica para multimedia del libro Corales Pétreos de Cuba publicado en 1980 por Nereida Martínez Estalella y Vasil Zlatarski.] (2021)
    Acuario Nacional de Cuba | La Habana, Cuba
    In:  elenag@acuarionacional.cu | http://aquaticcommons.org/id/eprint/15273 | 1545 | 2014-06-30 10:46:33 | 15273 | Acuario Nacional de Cuba
    Details
    Publication Date: 2021-07-05
    Description: Versión electrónica para multimedia del libro Corales Pétreos de Cuba publicado en 1980 por Nereida Martínez Estalella y Vasil Zlatarski. La colección de Corales pétreos se formó en el Instituto de Oceanología entre los años 1970 y 1975. En 2005 pasa a ser custodiada por el Acuario Nacional con el resto de las colecciones biológicas.La colección está formada por 4,990 ejemplares, 2 Clases Anthozoa e Hydrozoa , 16 familias, 30 géneros, 45 especies y 23 formas.Multimedia electronic book version of Stony Corals Cuba published in 1980 by Nereida Martínez Estalella and Vasil Zlatarski.The collection of stony corals are formed at the Institute of Oceanology between 1970 and 1975. Renumbered in 2005 by the National Aquarium guarded with other biological collections. The collection consists of 4,990 samples, 2 classes Anthozoa and Hydrozoa, 16 families, 30 genera, 45 species and 23 forms.
    Keywords: Biology ; Conservation ; Ecology ; Instituto de Oceanología ; corals ; taxonomía ; taxonomy ; videos ; Scleractinea ; Acroporidae ; Agariciidae ; Astrangiidae ; Caryophylliidae ; Columnastraeidae ; Hydrozoa ; Milleporina ; zlatarski
    Repository Name: AquaDocs
    Type: book , TRUE
    Format: other
    Format: application/zip
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    PAPER (OA)
  • 8
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    Larval development of the spotfin tonguefish (Symphurus oligomerus Mahadeva and Munroe, 1990) (Pleuronectiformes: Cynoglossidae) from the Gulf of California, Mexico (2021)
    In:  http://aquaticcommons.org/id/eprint/8766 | 403 | 2012-06-10 09:02:05 | 8766 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: Larval and early juvenile stages of Symphurus oligomerus aredescribed from 24 specimens from the Gulf of California. Meristic features were 48 – 49 total vertebrae, 87–94dorsal-fin rays, 73–77 anal-fin rays, 12 caudal-fin rays, and five hypural bones. Seven larvae and one juvenile were cleared and stained to obtain the pterygiophore formula (1-3-2-2-2) that confirmed the identification of S. oligomerus. The pigment pattern from preflexion to juvenile stage consists of three bands on the dorsal margin and two bands on the ventral margin formed by star-shaped melanophores on the left side of the body. The intestine in preflexion to postflexion larvae forms an abdominalprojection that ends in a short conical appendix. The intestine is supported by three cartilaginous struts; larvaewith these physical attributes are called exterilium larvae. Preflexion larvae have two elongated dorsal-finrays, and in flexion to postflexion larvae the second to the fourth dorsalfin rays are elongate. We found anapparent connection between the size at metamorphosis of the species of Symphurus and the depth distributionrange of adults such that the fish species that metamorphose at a larger size have a deeper distributionas adults and exterilium larvae seem to correspond to species that have deeper distributions.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 45-55
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  • 9
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    Spatial and seasonal abundance of sand seatrout (Cynoscion arenarius) and silver seatrout (C. nothus) off the coast of Texas, determined with twenty years of data (1987–200 (2021)
    In:  http://aquaticcommons.org/id/eprint/8809 | 403 | 2012-06-12 17:57:49 | 8809 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: Sand seatrout (Cynoscion arenarius) and silver seatrout (C.nothus) are both found within the immediate offshore areas of the Gulf of Mexico, especially around Texas; however information is limited on how much distributional overlap really occurs between these species. In order to investigate spatial and seasonal differences between species, we analyzed twenty years of bay and offshore trawl data collected by biologists of the Coastal Fisheries Division, Texas Parks and Wildlife Department. Sand seatrout and silver seatrout were distributed differently among offshore sampling areas, and salinity and water depth appeared to correlate with their distribution. Additionally,within the northernmost sampling area of the gulf waters, water depth correlated significantly with the presence of silver seatrout, which were found at deeper depths than sandseatrout. There was also an overall significant decrease in silver seatrout abundance during the summer season, when temperatures were at their highest, and this decrease mayhave indicated a migration farther offshore. Sand seatrout abundance had an inverse relationship with salinity and water depth offshore. In addition, sand seatrout abundance was highest in bays with direct passes to the gulf and correlated with corresponding abundance in offshore areas. These data highlight the seasonal and spatial differences in abundance between sand and silver seatrout and relatethese differences to the hydrological and geological features found along the Texas coastline.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 24-35
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  • 10
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    Short communication: Effects of the addition of a marigold extract to diets fed to channel catfish (Ictalurus punctatus) on growth parameters (2021)
    In:  http://aquaticcommons.org/id/eprint/22817 | 18721 | 2018-05-24 22:03:44 | 22817 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: The expansion of aquaculture in the last 10 years has made it an important source of protein worldwide. However, increased production, and the culture intensification it carries, results in higher risk of infectious disease due to poor water quality and high stocking densities. ... Marigold (Tagetes erecta L.) is a plant native to Mexico whose flowers accumulate carotenoids. Natural carotenoids extracted from marigold have been used in aquaculture to help in the survival of fish juvenile stages by strengthening their immunological system, thus reducing mortality rates. The effect of carotenoids in fish health may exert a positive effect on fish growth indices; however, these effects on growth parameters have not been studied in channel catfish (Ictalurus punctatus), which is the most cultured fish species in north-eastern Mexico, and one of the most cultured on the southern United States. Consequently, the aim of this study was to investigate if there were significant differences in growth among channel catfish juveniles when fed diets containing various carotenoid doses from a natural source.
    Keywords: Aquaculture ; Biology ; Fisheries ; Catfish ; Marigold extract ; Growth ; Ictalurus punctatus ; aquaculture ; México
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 797-804
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