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  • 1
    Publication Date: 2019
    Print ISSN: 1097-6256
    Electronic ISSN: 1546-1726
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 2
    Publication Date: 2003-08-16
    Description: The diversity, frequency, and scale of human impacts on coral reefs are increasing to the extent that reefs are threatened globally. Projected increases in carbon dioxide and temperature over the next 50 years exceed the conditions under which coral reefs have flourished over the past half-million years. However, reefs will change rather than disappear entirely, with some species already showing far greater tolerance to climate change and coral bleaching than others. International integration of management strategies that support reef resilience need to be vigorously implemented, and complemented by strong policy decisions to reduce the rate of global warming.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hughes, T P -- Baird, A H -- Bellwood, D R -- Card, M -- Connolly, S R -- Folke, C -- Grosberg, R -- Hoegh-Guldberg, O -- Jackson, J B C -- Kleypas, J -- Lough, J M -- Marshall, P -- Nystrom, M -- Palumbi, S R -- Pandolfi, J M -- Rosen, B -- Roughgarden, J -- New York, N.Y. -- Science. 2003 Aug 15;301(5635):929-33.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Coral Reef Biodiversity, James Cook University, Townsville, Qld 4811, Australia. terry.hughes@jcu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12920289" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Biological ; Animals ; Anthozoa/growth & development/*physiology ; *Climate ; *Conservation of Natural Resources ; *Ecosystem ; Environment ; Fishes ; Greenhouse Effect ; Humans
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2005-11-30
    Description: The development of weight-saving advanced design concepts for shuttle airframe structure is presented. Design concepts under investigation employ selective composite reinforcement and/or efficient geometric arrangements. An effort to develop metallic panel designs which exploit the relaxation of smooth external-surface requirements for skin structure is reviewed. Available highlights from research and development studies which investigate the application of composite reinforcement to the design of two types of fuselage panels, a shear web, a large fuselage frame, and a landing-gear-door assembly are presented. Preliminary results from these studies suggest weight savings of 25 percent can be obtained.
    Keywords: SPACE VEHICLES
    Type: NASA Space Shuttle Technol. Conf.; p 537-572
    Format: text
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  • 4
    Publication Date: 2005-11-27
    Description: NASA programs for composite space shuttle structures
    Keywords: SPACE VEHICLES
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 3 JUL. 1970; P 73-92
    Format: text
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  • 5
    Publication Date: 2006-02-14
    Description: A baseline structure proposed for the microwave radiometer spacecraft (MRS) reflector is a large graphite-epoxy truss. The truss structure was selected to provide adequate stiffness to minimize control problems and to provide a low-expansion 'strong back' on which to mount and control reflector mesh panels. Details of the structural members, joints and assembly concepts are presented, a concept for the reflector mesh surface is discussed, and preliminary estimates of the mass and structural natural frequencies of the reflector system are presented.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: The Microwave Radiometer Spacecraft; p 95-107
    Format: text
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  • 6
    Publication Date: 2006-10-26
    Description: Buckling of reinforced orthotropic cylinders
    Keywords: THERMODYNAMICS AND COMBUSTION
    Format: text
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  • 7
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    In:  Other Sources
    Publication Date: 2011-08-18
    Description: The design of prospective NASA space station components which inherently possess the means for structural growth without compromising initial system characteristics is considered. In structural design terms, space station growth can be achieved by increasing design safety factors, introducing dynamic isolators to prevent loads from reaching the initial components, or preplanning the refurbishment of the original structure with stronger elements. Design tradeoffs will be based on the definition of on-orbit loads, including docking and maneuvering, whose derived load spectra will allow the estimation of fatigue life. Improvements must be made in structural materials selection in order to reduce contamination, slow degradation, and extend the life of coatings. To minimize on-orbit maintenance, long service life lubrication systems with advanced sealing devices must be developed.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Astronautics and Aeronautics; 21; Mar. 198
    Format: text
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  • 8
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    Publication Date: 2011-08-17
    Description: Recent developments indicate that there may soon be a revolution in aerospace structures. Increases in allowable operational stress levels, utilization of high-strength, high-toughness materials, and new structural concepts will highlight this advancement. Improved titanium and aluminum alloys and high-modulus, high-strength advanced composites, with higher specific properties than aluminum and high-strength nickel alloys, are expected to be the principal materials. Significant advances in computer technology will cause major changes in the preliminary design cycle and permit solutions of otherwise too-complex interactive structural problems and thus the development of vehicles and components of higher performance. The energy crisis will have an impact on material costs and choices and will spur the development of more weight-efficient structures. There will also be significant spinoffs of aerospace structures technology, particularly in composites and design/analysis software.
    Keywords: STRUCTURAL MECHANICS
    Type: Astronautics and Aeronautics; 16; July-Aug
    Format: text
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  • 9
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    In:  Other Sources
    Publication Date: 2011-08-17
    Description: The development of large space structures (LSS) for the 1980s is surveyed. Consideration is given to LSS mission requirements, large space antenna technology, several steps towards LSS development (1985-1995), structures technology needs (e.g., structural design criteria, assembly concepts, and practical joint and member concepts), structural dynamics/controls technology needs, and materials technology needs (e.g., accelerated test techniques and life prediction techniques).
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Astronautics and Aeronautics; 16; Oct. 197
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  • 10
    Publication Date: 2011-08-18
    Description: A concept for approximating curved antenna surfaces using flat facets is discussed. A preliminary design technique for determining the size of the reflector surface facets necessary to meet antenna surface accuracy requirements is presented. A proposed large microwave radiometer satellite (MRS) is selected as an application, and the far-field electromagnetic response of a faceted reflector surface is compared with that from a spherical reflector surface.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IEEE Transactions on Antennas and Propagation; AP-29; July 198
    Format: text
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