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  • 1
    Electronic Resource
    Electronic Resource
    Computer control and data-acquisition system for the rf test facility (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1904-1906 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The radio frequency test facility (RFTF) at Oak Ridge National Laboratory, used to test and evaluate high-power ion cyclotron resonance heating (ICRH) systems and components, is monitored and controlled by a multicomponent computer system. This data-acquisition and control system consists of three major hardware elements: (1) an Allen-Bradley PLC-3 programmable controller, (2) a VAX 11/780 computer, and (3) a CAMAC serial highway interface. Operating in LOCAL as well as REMOTE mode, the programmable logic controller (PLC) performs all the control functions of the test facility. The VAX computer acts as the operator's interface to the test facility by providing color mimic panel displays and allowing input via a trackball device. The VAX also provides archiving of trend data acquired by the PLC. Communications between the PLC and the VAX are via the CAMAC serial highway. Details of the hardware, software, and the operation of the system are presented in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138790
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    ATF data system (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1765-1767 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The data system for the advanced toroidal facility (ATF) is a logical extension of the system used for the Impurity Studies Experiment ISX-B. Based on the ISX-B concepts and hardware, it extends them to provide support for long-pulse or steady-state operation of ATF. The system is now network based rather than shared memory based and can dynamically add or remove processors. The hardware consists of a pair of VAX 8700 CPUs and an assortment of MicroVAX front ends. This hardware acquires all data, generates all control waveforms, and provides trending and logging services for the safety interlock and control systems. These systems are based on programmable logic controllers (PLCs) which are independent of the data system. The software consists of three major components: a master scheduling and monitoring system (SAMS) that provides synchronizing services and allocates files and memory; a signal-based data and file management package (DMG) that provides data access services; and the ORNL CAMAC driver package. All diagnostics are supported by data acquisition and analysis software (either generic or specialized) that is based on and shared by these services.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140105
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Energy flow and the number of trophic levels in ecological communities (1978)
    [s.l.] : Nature Publishing Group
    Nature 273 (1978), S. 406-407 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PIMM and Lawton1 showed, using Monte Carlo simulation methods, that the return times to equilibrium, 7"R, following small perturbations to ecological food chain populations modelled by Lotka-Volterra equations, are positively correlated with the lengths, L, of the food chains. We have made similar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/273406c0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Regional environmental simulation of African cattle herding societies (1986)
    Springer
    Human ecology 14 (1986), S. 117-130 
    Details
    ISSN: 1572-9915
    Keywords: regional ; East Africa ; cattle ; simulation ; food supply
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract Regional analyses of the interaction between human populations and natural resources must integrate landscape scale environmental problems. An approach that considers human culture, environmental processes, and resource needs offers an appropriate methodology. With this methodology, we analyze problems of food availability in African cattle-keeping societies. The analysis interrelates cattle biomass, forage availability, milk and blood production, crop yields, gathering, food subsidies, population, and variable precipitation. While an excess of cattle leads to overgrazing, cattle also serve as valuable food storage mechanisms during low rainfall periods. Food subsidies support higher population levels but do not alter drought-induced population fluctuations. Variable precipitation patterns require solutions that stabilize year-to-year food production and also address problems of overpopulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889213
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    Paper (German National Licenses)
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