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Risk assessment of chemicals in the river Main (Germany): application of selected partial order ranking tools
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2011 - Special issue. Partial orders in applied sciences
Anno: 2011
Assessments of the behavior and impact of chemicals in the environment typically require a multicriteria approach as a multitude of parameters has to be taken into account in order to disclose the full picture. In the present paper we demonstrate how selected partial order ranking tools can be applied as decision support. As an illustrative example a series of 14 chemicals, belonging to 4 different classes of chemicals, found in the river Main (Germany) have been assessed based on 3 parameters, i.e. volatilization, sedimentation and advection, determinative for their exposure behavior. In addition to ordinary partial order ranking more advanced tools as average ranks and dominance analysis have been applied leading to conclusions as to which class of chemicals should receive primary attention. Further, the analyses suggest directions for risk management such as pointing to specific sources for the most problematic pollutants. Keywords: Partial Order Ranking, Hasse Diagram Technique, Average Rank, Dominance Analysis, Environmental Impact Assessment, EIA, River Main.
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Ranking of coagulants for wastewater treatment using partial order theory
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2011 - Special issue. Partial orders in applied sciences
Anno: 2011
Jar-test is a useful tool for chemicals selection for physical–chemical wastewater treatment. The results show the treatment efficiency in terms of suspended matter and organic matter removal. However, in spite of having all these results, coagulant selection is not an easy task because one coagulant can remove efficiently the suspended solids but at the same time increase the conductivity. In this paper, the use of Partial Order Scaling Analysis (POSA) is proposed to help on the selection of the coagulant and its concentration in a sequencing batch reactor (SBR). An evaluation of two commonly used coagulation-flocculation aids was conducted and based on jar tests and POSA model, Ferric Chloride (100 ppm) was the best choice. Keywords: Coagulation, Jar Test, Partial Order Scaling Analysis, Treatment Selection.
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Application of the PyHasse program features: Sensitivity,Similarity, and Separability for environmental health data
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2011 - Special issue. Partial orders in applied sciences
Anno: 2011
It has been evident for decades that many environmental chemicals pose an enormous risk to the environment as well as to humans. There is increasing pressure to intensify the research and to more efficiently evaluate the data on persistent and bioaccumulative chemicals in the environment as well as in human bodies. An appropriate data analysis method is based on the theory of partially ordered sets. The program PyHasse, developed by the third author, provides several features which are useful for gaining information out of the data and drawing conclusions concerning the impact of those chemicals and their prevention. In our data analysis approach we investigated data sets of breast milk samples of women in Denmark and Finland which contained measurable levels of 32 persistent organic pollutants (POPs). Three important features of the PyHasse program are used: The Sensitivity Analysis, the Similarity Analysis and the Separability Analysis. The aim of this discrete mathematical approach is to find differences in the chemicals’ contamination between the healthy boys and those boys who were suffering from congenital malformations (cryptorchidism). Keywords: Environmental Health Data, Persistent Organic Pollutants (POPs), Cryptorchidism, Partial Order, PyHasse Program.
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La rivolta araba: è vera primavera?
Gratis
digital
formato: Articolo | VITA E PENSIERO - 2011 - 2
Anno: 2011
Richiesta di democrazia e pluralismo, rifiuto dell’uomo forte, disponibilità verso l’Occidente: un’analisi della protesta che sta interessando il Nord Africa, ma anche tutto il Medio Oriente.
€ 3,60 Gratis
EDITORIALE: «Finché la terra durerà»
Gratis
digital
formato: Articolo | LA RIVISTA DEL CLERO ITALIANO - 2011 - 2
Anno: 2011
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Introduzione - Introduction
Gratis
digital
formato: Articolo | COMUNICAZIONI SOCIALI - 2011 - 1. Cinema e sonoro in Italia (1945-1970)
Anno: 2011
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Note biografiche - Biographical notes
Gratis
digital
formato: Articolo | COMUNICAZIONI SOCIALI - 2011 - 1. Cinema e sonoro in Italia (1945-1970)
Anno: 2011
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Per-formazione. Un'introduzione critica
Gratis
digital
formato: Articolo | COMUNICAZIONI SOCIALI - 2011 - 2. Per-formazione. Teatro e arti performative nella scuola e nella formazione della persona
Anno: 2011
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Note biografiche - Biographical notes
Gratis
digital
formato: Articolo | COMUNICAZIONI SOCIALI - 2011 - 2. Per-formazione. Teatro e arti performative nella scuola e nella formazione della persona
Anno: 2011
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Libri ricevuti
Gratis
digital
formato: Articolo | RIVISTA DI STORIA DELLA CHIESA IN ITALIA - 2011 - 2
Anno: 2011
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Indice generale dell’annata
Gratis
digital
formato: Articolo | RIVISTA DI STORIA DELLA CHIESA IN ITALIA - 2011 - 2
Anno: 2011
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Editorial
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2011 - 1
Anno: 2011
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