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  • 1
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    Effects of size and temperature on metabolic rate (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-22
    Description: We derive a general model, based on principles of biochemical kinetics and allometry, that characterizes the effects of temperature and body mass on metabolic rate. The model fits metabolic rates of microbes, ectotherms, endotherms (including those in hibernation), and plants in temperatures ranging from 0 degrees to 40 degrees C. Mass- and temperature-compensated resting metabolic rates of all organisms are similar: The lowest (for unicellular organisms and plants) is separated from the highest (for endothermic vertebrates) by a factor of about 20. Temperature and body size are primary determinants of biological time and ecological roles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gillooly, J F -- Brown, J H -- West, G B -- Savage, V M -- Charnov, E L -- New York, N.Y. -- Science. 2001 Sep 21;293(5538):2248-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, The University of New Mexico, Albuquerque, NM 87131, USA. gillooly@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11567137" target="_blank"〉PubMed〈/a〉
    Keywords: Amphibians/metabolism ; Animals ; *Basal Metabolism ; *Body Constitution ; Body Temperature ; *Body Weight ; Carbon Dioxide/metabolism ; Fishes/metabolism ; Fractals ; Longevity ; Mammals/metabolism ; Mathematics ; *Models, Biological ; Oxygen Consumption ; Plants/metabolism ; Reptiles/metabolism ; Species Specificity ; *Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    Comment on "The illusion of invariant quantities in life histories" (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-04-15
    Description: Nee et al. (Reports, 19 August 2005, p. 1236) used a null model to argue that life history invariants are illusions. We show that their results are largely inconsequential for life history theory because the authors confound two definitions of invariance, and rigorous analysis of their null model demonstrates that it does not match observed data.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Savage, Van M -- White, Ethan P -- Moses, Melanie E -- Ernest, S K Morgan -- Enquist, Brian J -- Charnov, Eric L -- New York, N.Y. -- Science. 2006 Apr 14;312(5771):198; author reply 198.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Bauer Center for Genomics Research, Harvard University, Cambridge, MA 02138, USA. vsavage@cgr.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16614200" target="_blank"〉PubMed〈/a〉
    Keywords: Analysis of Variance ; Animals ; *Biological Evolution ; Body Size ; *Body Weight ; Clutch Size ; *Growth ; Longevity ; Mathematics ; *Models, Biological ; Regression Analysis ; *Reproduction ; Sexual Maturation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    PSHFT - COMPUTERIZED LIFE AND RELIABILITY MODELLING FOR TURBOPROP TRANSMISSIONS (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The computer program PSHFT calculates the life of a variety of aircraft transmissions. A generalized life and reliability model is presented for turboprop and parallel shaft geared prop-fan aircraft transmissions. The transmission life and reliability model is a combination of the individual reliability models for all the bearings and gears in the main load paths. The bearing and gear reliability models are based on the statistical two parameter Weibull failure distribution method and classical fatigue theories. The computer program developed to calculate the transmission model is modular. In its present form, the program can analyze five different transmissions arrangements. Moreover, the program can be easily modified to include additional transmission arrangements. PSHFT uses the properties of a common block two-dimensional array to separate the component and transmission property values from the analysis subroutines. The rows correspond to specific components with the first row containing the values for the entire transmission. Columns contain the values for specific properties. Since the subroutines (which determine the transmission life and dynamic capacity) interface solely with this property array, they are separated from any specific transmission configuration. The system analysis subroutines work in an identical manner for all transmission configurations considered. Thus, other configurations can be added to the program by simply adding component property determination subroutines. PSHFT consists of a main program, a series of configuration specific subroutines, generic component property analysis subroutines, systems analysis subroutines, and a common block. The main program selects the routines to be used in the analysis and sequences their operation. The series of configuration specific subroutines input the configuration data, perform the component force and life analyses (with the help of the generic component property analysis subroutines), fill the property array, call up the system analysis routines, and finally print out the analysis results for the system and components. PSHFT is written in FORTRAN 77 and compiled on a MicroSoft FORTRAN compiler. The program will run on an IBM PC AT compatible with at least 104k bytes of memory. The program was developed in 1988.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: LEW-14905
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Transmission overhaul and component replacement predictions using Weibull and renewal theory (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 7; 1049-105
    Format: text
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    NASA TECHNICAL REPORTS
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