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  • 1
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    The speckled scallop, Argopecten circularis, in Aqua Hedionda Lagoon, San Diego County, California (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/724 | 8 | 2011-09-29 21:38:24 | 724 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Speckled scallops, Argopecten circularis (Sowerby, 1835), were sampled at Agua Hedionda Lagoon, Carlsbad, San Diego County from March 1984 to October 1986, to obtain basic life history data. Monthly samples of scallops were collected, measured, and released to obtain length frequency data for estimates of growth, life span, and spawning period. Subsamples of scallops were collected for determination of gonadal-somatic and adductor muscle-somatic indices.In 1984 large concentrations of speckled scallops were found on the sand-silt bottom of the lagoon, closely associated with eelgrass, Zostra marina. During the course of the study the numbers of scallops declined, until their virtual disappearance at the end of 1986. Monthly length frequency plots from 24,375 scallop measurements indicate that this is a rapidly growing species with a short life span. Gonadal- and adductor muscle-somatic indices from subsamples of 1,714 scallops indicate first spawning at age one and a relationship between temperature and spawning.Based on this study management recommendations are made for the speckled scallop. (39pp.)
    Keywords: Management ; Fisheries ; Biology ; speckled scallop ; Argopecten circularis ; Aqua Hedionda Lagoon ; San Diego ; California
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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    PAPER (OA)
  • 2
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    Red abalone size data from Johnsons Lee, Santa Rosa Island, collected from 1978 to 1984 (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/720 | 8 | 2011-09-29 21:39:31 | 720 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Red abalone, Haliotis rufescens, were collected at Johnsons Lee, Santa Rosa Island, in the summers of 1978 through 1982, and in 1984, to obtain data for determining various fishery population parameters. Annual visits to the study site were made at yearly intervals to simplify growth calculations.During the first four visits, 2145 red abalones were tagged,measured, and replaced. Shell damage, soft tissue injuries, and causes of mortality were noted. The method of tagging isdescribed.Recovery of first tagged abalone after one year was approximately 30%. Analysis of variance of the annual samples indicated that the samples were, with one exception, not different. Summaries are presented of the number of abalone collected and tagged by year, frequencies of shell damage, soft tissue injury, predatory sponge infestation, and total mortality. Appendices include a listing of the raw size data and various codes for each tagged abalone. (56pp.)
    Keywords: Management ; Fisheries ; Biology ; Red abalone ; Haliotis rufescens ; Santa Roas Island ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    Densities and size compositions of red abalone, Haliotis rufescens, at five locations on the Mendocino and Sonoma County coasts, September 1986 (2021)
    California Department of Fish and Game, Marine Resources Region | Fort Bragg, CA
    In:  http://aquaticcommons.org/id/eprint/449 | 8 | 2011-09-29 22:04:33 | 449 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: Red abalone, Haliotis rufescens, populations were sampled on 155 transects at five locations along the Mendocino and Sonoma County coast in September 1986. Although abalone occurrence was highly variable, the highest abundance usually occurred in relatively shallow nearshore areas. Size compositions were dominated by large, old abalone with all locations having 50% or more abalone larger than the recreational minimum size. Densities of red sea urchins, Strongylocentrotus franciscanus, on the transects were also variable, but high urchin abundance tended to occur at greater depths than high abalone abundance.(Document has 72 pages.)
    Description: 72pp.
    Keywords: Management ; Fisheries ; Biology ; red abalone ; Haliotis rufescens ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    Techniques for extreme attitude suspension of a wind tunnel model in a magnetic suspension and balance system (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Although small scale magnetic suspension and balance systems (MSBSs) for wind tunnel use have been in existence for many years, they have not found general application in the production testing of flight vehicles. One reason for this is thought to lie in the relatively limited range of attitudes over which a wind tunnel model may be suspended. Modifications to a small MSBS to permit the suspension and control of axisymmetric models over angles of attack from less than zero to over ninety degrees are reported. Previous work has shown that existing arrangement of ten electromagnets was unable to generate one of the force components needed for control at extreme attitudes. Examination of possible solutions resulted in a simple alteration to rectify this deficiency. To generate the feedback signals to control the suspended model, an optical position sensing system using collimated laser beams and photodiode arrays was installed and tested. An analytical basis was developed for distributing the demands for force and moment needed for model stabilization amonge the electromagnets over the full attitude range. This was implemented by an MSBS control program able to continually adjust the distribution for the instantaneous incidence in accordance with prescheduled data. Results presented demonstrate rotations of models from zero to ninety degrees at rates up to ninety degrees per second, with pitching rates rising to several hundred degrees per second in response to step-change demands. A study of a design for a large MSBS suggests that such a system could be given the capability to control a model in six degrees of freedom over an unlimited angle of attack range.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-181895 , NAS 1.26:181895
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    NASA TECHNICAL REPORTS
  • 5
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    High angle of attack position sensing for the Southampton University magnetic suspension and balance system (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An all digital five channel position detection system is to be installed in the Southampton University Magnetic Suspension and Balance System (SUMSBS). The system is intended to monitor a much larger range of model pitch attitudes than has been possible hitherto, up to a maximum of a 90 degree angle of attack. It is based on the use of self-scanning photodiode arrays and illuminating laser light beams, together with purpose built processing electronics. The principles behind the design of the system are discussed, together with the results of testing one channel of the system which was used to control the axial position of a magnetically suspended model in SUMSBS. The removal of optically coupled heave position information from the axial position sensing channel is described.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-178358 , NAS 1.26:178358 , AASU-87/3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Progress towards extreme attitude testing with Magnetic Suspension and Balance Systems (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Progress is reported in a research effort aimed towards demonstration of the feasibility of suspension and aerodynamic testing of models at high angles of attack in wind tunnel Magnetic Suspension and Balance Systems. Extensive modifications, described in this paper, have been made to the Southampton University suspension system in order to facilitate this work. They include revision of electromagnet configuration, installation of all-new position sensors and expansion of control system programs. An angle of attack range of 0 to 90 deg is expected for axisymmetric models. To date, suspension up to 80 deg angle of attack has been achieved.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AIAA PAPER 88-2012 , Aerodynamic Testing Conference; May 18, 1988 - May 20, 1988; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Digital control of wind tunnel magnetic suspension and balance systems (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Digital controllers are being developed for wind tunnel magnetic suspension and balance systems, which in turn permit wind tunnel testing of aircraft models free from support interference. Hardware and software features of two existing digital control systems are reviewed. Some aspects of model position sensing and system calibration are also discussed.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: ICIASF ''87 - International Congress on Instrumentation in Aerospace Simulation Facilities; Jun 22, 1987 - Jun 25, 1987; Williamsburg, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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