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  • 1
    Electronic Resource
    Electronic Resource
    Soil moisture profiles from multifrequency radar data at basin scale (1996)
    Springer
    Meccanica 31 (1996), S. 59-72 
    Details
    ISSN: 1572-9648
    Keywords: Soil moisture ; Active microwave sensor ; Hydrometeorology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario Misure a microonde attive (radar) in multifrequenza e valori misurati di umidità del suolo sono stati utilizzati per analizzare la profondità di penetrazione del segnale radar e la relativa possibilità di stimare il profilo di umidità verticale. Un modello teorico di scattering è stato utilizzato per ricavare dai dati radar relativi alle bande di frequenze C (5.3 GHz), L (1,25 GHz), e P (0.44 GHz) i valori di costante dielettrica del suolo ed il corrispondente contenuto d'acqua. I dati analizzati, relativi al bacino sperimentale del Virginiolo (Toscana), sono stati acquisiti durante la campagna di misura MAC-Europe '91. La penetrazione del segnale radar nel suolo è stata analizzata confrontando i valori ottenuti dall'inversione del segnale radar alle diverse frequenze. La stima da sensore remoto del contenuto idrico alle due profondità esaminate ha evidenziato la potenzialità applicativa della metodologia implementata per la determinazione dei profili di ‘exfiltrazione’ nel suolo.
    Notes: Abstract Multifrequency radar data are used to investigate the possibility offered by microwave remote sensing in estimating soil moisture on bare soil fields. Surface soil moisture values obtained from the inversion of a theoretical scattering model for the MAC-Europe '91 airborne campaign are compared with sampled ground measures of soil moisture for the Virginiolo experimental catchment (Tuscany, Italy). The radar signal penetration depth is then analysed for the examined fields comparing soil moisture values measured at two different depths and simulated values retrieved from the inverted radar data at different frequencies. The experienced soil moisture exfiltration profiles are detected by the radar signal in L and P band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00444155
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  • 2
    Electronic Resource
    Electronic Resource
    Two implementation relations and the correctness of communicating replicated processes (1997)
    Springer
    Formal aspects of computing 9 (1997), S. 119-148 
    Details
    ISSN: 1433-299X
    Keywords: Fault-tolerance ; Distributed replicated systems ; Communicating sequential processes ; Nondeterminism ; Partial and total correctness ; Divergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper studies the correctness of distributed systems made up of replicated processes that communicate by message passing. Processes are described within the divergence model of CSP. The notion of correctness introduced is based on a relation that formally expresses the conformance of an implementation process with the target process it is intended to implement. A weak and a strong version of the relation are introduced, aimed at treating acyclic and cyclic process networks respectively. Both allow the study of (total) correctness and may cope with non-deterministic targets and implementations. We then show how a target process may be implemented (in the formal sense introduced) by replicating it in a set of copies, a majority of which is non-faulty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01211616
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    Paper (German National Licenses)
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