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  • STRUCTURAL MECHANICS  (4)
  • Aquaculture  (1)
  • General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.  (1)
  • 1
    Publication Date: 2014-09-25
    Description: Author(s): A. G. Manning, R. Khakimov, R. G. Dall, and A. G. Truscott Researchers have demonstrated a new source of individual helium atoms at picokelvin temperatures, paving the way for testing the entanglement of particles with mass. [Phys. Rev. Lett. 113, 130403] Published Wed Sep 24, 2014
    Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 2
    Publication Date: 2013-08-31
    Description: During the past few years it has been recognized that combining passive structural design methods with active control techniques offers the prospect of being able to find substantially improved designs. These developments have stimulated interest in augmenting structural synthesis by adding active control system design variables to those usually considered in structural optimization. An essential step in extending the approximation concepts approach to control augmented structural synthesis is the development of a behavior sensitivity analysis capability for determining rates of change of dynamic response quantities with respect to changes in structural and control system design variables. Behavior sensitivity information is also useful for man-machine interactive design as well as in the context of system identification studies. Behavior sensitivity formulations for both steady state and transient response are presented and the quality of the resulting derivative information is evaluated.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Sensitivity Analysis in Engineering; p 33-57
    Format: application/pdf
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  • 3
    Publication Date: 2019-06-28
    Description: Recent research efforts have led to the development of simultaneous structural/control system design procedures. Absent in any of the work is the time delay present in the control system sensors and actuators and the computational time delay for synthesizing actuator commands from sensor measurements. Madden has shown that the time delay present in the control system can have profound effects on the resulting system performance and stability regardless of its source. In addition, many of the simultaneous structural/control system design procedures have used colocated sensors and actuators for implementation of the control system. In actual practice, colocation in not always possible. The issue of stability degradation when using noncolocated sensor and actuators was raised. The integrated structural/control system design procedure is extended to include the effects of time lag and noncolocation of sensors and actuators on the resulting optimum designs.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Langley Research Center, Research in Structures, Structural Dynamics and Materials, 1989; p 35-45
    Format: application/pdf
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  • 4
    Publication Date: 2019-06-28
    Description: An integrated approach to the optimum design of control augmented structural systems is presented in which structural variables and control variables are changed simultaneously during the design process. Constraints are imposed on peak transient dynamic displacements and accelerations, static displacements, natural frequencies, and control system effort. Side constraints imposed on structural member sizes and control system thresholds and actuator output forces insure the generation of physically meaningful designs. Example problems are presented which bring out the benefits of simultaneous treatment of both the structural design variables and the control design variables.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 87-0749
    Format: text
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  • 5
    Publication Date: 2019-07-12
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 28; 883-891
    Format: text
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  • 6
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    In:  http://aquaticcommons.org/id/eprint/9042 | 115 | 2012-11-24 07:39:05 | 9042 | WorldFish Center
    Publication Date: 2021-07-01
    Description: Jamaica, with its overfish marine resources, has become a major tilapia producer in Latin America led by a small number of large farms practicing tilapia culture with considerable commercial success. Across the country, however, aquaculture is typically practiced by a large number of small-scale fish farmers who own less than 1.0 ha of land. Production is constrained by lack of credit, finite land space and suitable soil type, but larger existing aquaculturists are expanding further for overseas markets. Inspired by pioneering tilapia fish culture demonstration projects funded by the USAID and the goverment of Jamaica, fish culture production rose from a few hundred kg of Oreochromis niloticus in 1977, to about 5000 t of processed fish mainly red hybrid tilapia, in 2000. Most of this quantity was exported to Europe and North America.
    Keywords: Aquaculture ; Aquaculture development ; Aquaculture enterprises ; Fish culture ; Jamaica ; Oreochromis niloticus ; Oreochromis mossambicus ; Colossoma macropomus ; Macrobrachium rosenbergii
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 10-15
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