John S. Duffield

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In case of accidental release of radionuclides into the environment, actinides represent a severe health risk to human beings following internal contamination (inhalation, ingestion or wound). For a better understanding of the actinide behaviour in man (in term of metabolism, retention, excretion) and in specific biological systems (organs, cells or(More)
A model is a representation of some real phenomena and contains aspects or elements of the real system to be modeled. The model reflects (or duplicates) the type of behavior (or mechanisms) seen in the real system. The main characteristic of any model is the mapping of elements or parameters found in the system being studied (e.g. tongue dorsum biofilm in(More)
We know from observation that some democracies intervene deeply in their domestic economies while others adopt a more laissez faire approach. Can we explain these differences solely with ideology, or are other political influences also at work? I argue in this paper that elected leaders sometimes opt for hefty economic regulation purely to generate sources(More)
The 0-5 organoleptic scale is used widely in breath research and in trials to measure the efficacy of anti-odor agents. However, the precise relationship between odor scores and gas concentrations of target odorants is unknown. The purpose of this study was to relate mean organoleptic scores from odor judges (n = 7) for pure odorants (n = 8) representative(More)
A new model about the genesis of malodour emanating from the tongue is introduced. A new approach uses mathematical formulae to combine existing empirical knowledge and bring it into context. The resulting description of halitosis includes the three-dimensional structure of the tongue dorsum surface as the substratum, and the transfer of oxygen and(More)
BACKGROUND The purpose of this review was to assess the relationship between mean organoleptic scores (using a 0-to-5 scale) and concentrations of putative odorants representative of those thought to be important in oral malodor, as well as to propose a simple model that explains the dose-response curves obtained from a group of odor judges. METHODS The(More)
In this paper we estimate the economic loss of hypothetical beach closures on the Padre Island National Seashore on the Gulf Coast of Texas. We use a travel cost random utility maximization (RUM) model with data from a random phone survey of Texas residents completed in 2001. We simulate realistic closures that may occur in event of an oil spill or other(More)
  • Charles R. Hankla, Charles Robert Hankla, +4 authors Eric Reinhardt
  • 2013
We know from observation that some democracies intervene deeply in their domestic economies while others adopt a more laissez faire approach. Can we explain these differences solely with ideology, or are other political influences also at work? I argue in this paper that elected leaders sometimes opt for hefty economic regulation purely to generate sources(More)
This project seeks to expand the dialogue about international humanitarian intervention in a complex emergency or mass atrocity situation by asserting that post-intervention political reconstruction is as essential to the intervention as is the provision of material humanitarian aid and even the ostensive goal of protecting the aid regimes. As a result of(More)