Search results for " Sensitivity"
showing 10 items of 947 documents
Chemical composition of the essential oils of Centaurea tomentella Hand.-Mazz. and C. haussknechtii Boiss. (Asteraceae) collected wild in Turkey and …
2018
In the present study the chemical composition of the essential oils from aerial parts of Centaurea tomentella Hand.-Mazz. and C. haussknechtii Boiss. collected in Turkey was evaluated by GC and GC-MS. The main components of C. tomentella L. were hexadecanoic acid (19.7%), caryophyllene oxide (6.6%) and spathulenol (4.8%) whereas C. haussknechtii was rich in hexadecanoic acid (26.2%), (Z,Z)-9,12-octadecadienoic acid (19.3%), heptacosane (5.3%) and nonacosane (5.1%). Antibacterial and antifungal activities against some microorganisms infesting historical art craft, were also determined.
Giant reedasenergycropforSouthernItaly: An economicfeasibilitystudy
2016
Among renewablesourcesgiantreedhasattractedagrowinginterestasenergycropespeciallyin Southern Europe,thankstoitslowagronomicinputrequirements.Thispaperaimedatevaluatingthe economic feasibilityofintroductionofgiantreedplantationasenergycropintheSouthernItaly.In particular,aneconomicand financial analysiswasperformedbycomparinggiantreed(bothfor woodchip andchoppedforageproduction)withtraditionalcrops(pluriannualandannual)thatare currentlycultivatedinthesamearea,suchaswinegrape,melonandtomato.Resultsshowedthehighest profitability ofgiantreedrespecttoothercropswithcurrentmarketprices.Inparticular,giantreed destined towoodchipproductiondenotedthehighestannualgrossmarginwithavalueof647.10 € ha1, f…
ECONOMIC EVALUATION OF MEDITERRANEAN SEA BASS FARMS ACCORDING TO MARKET TYPOLOGY
2014
Italy represents one of the main production countries of European sea bass and, in this context, Sicilian fish farms play a key role. Since in the last years the economic development has led to an increasingly globalized market, in this paper it has been carried out an economic evaluation of two Sicilian European sea bass farms according to the market typology in which their product is allocated: competitive and oligopolistic market. Moreover, a sensitivity analysis allows to understand how market prices could influence farm economic performances. Results showed higher profit for farm that sold product in oligopolistic market, even if sensitivity analysis highlighted that both farms were ve…
Multiple stressors facilitate the spread of a non-indigenous bivalve in the Mediterranean Sea
2018
Aim The introduction of non‐indigenous species (NIS) via man‐made corridors connecting previously disparate oceanic regions is increasing globally. However, the environmental and anthropogenic factors facilitating invasion dynamics and their interactions are still largely unknown. This study compiles and inputs available data for the NIS bivalve Brachidontes pharaonis across the invaded biogeographic range in the Mediterranean basin into a species distribution model to predict future spread under a range of marine scenarios. Location Mediterranean Sea. Methods A systematic review produced the largest presence database ever assembled to inform the selection of biological, chemical and physic…
Essential oil components of orange peels and antimicrobial activity
2016
In this study, the orange peel of 12 cultivars of Citrus sinensis from central-eastern Sicily was employed to obtain essential oils and extracts. The ones were extracted through steam distillation, the others through extraction in hexane. Chemical constituents were evaluated in terms of qualitative and quantitative analyses by gas chromatography/mass spectrometry. Fifty-four components were identified in the steam essential oils and 44 in the extracts. In all the cultivars, the main component is d-limonene (73.9–97%); discrete percentages of linalool, geraniol and nerol were also found. Cluster analysis based on essential oils composition showed a certain degree of affinity between cultivar…
Global sensitivity analysis for micropollutant modeling by means of an urban integrated approach
2015
The paper presents the sensitivity analysis of an integrated urban water quality system by means of the global sensitivity analysis (GSA). Specifically, an home-made integrated model developed in previous studies has been modified in order to include the micropollutant assessment (namely, sulfamethoxazole - SMX). The model is able to estimate also the interactions between the three components of the system: sewer system (SS), wastewater treatment plant (WWTP) and the receiving water body (RWB). The analysis has been applied to an experimental catchment nearby Palermo (Italy): the Nocella catchment. Five scenarios each characterized by different combinations of sub-systems (i.e., SS, WWTP an…
Global sensitivity analysis in integrated water quality modelling: an application to a real case study
2012
The increasing sensitivity towards water quality environmental issues led to the setting up of water quality integrated modelling approaches and the definition of water quality criteria that better represent the receiving water body quality status. More specifically, compared to the past, the tendency today is to design and manage the whole integrated urban drainage system, i.e. , wastewater treatment plant and receiving water body (RWB) considering each component not separately but jointly. Despite the advantages of a holistic approach for the assessment of the RWB quality state there are some limits that may prevent a straightforward application. Indeed, integrated models are generally ch…
Sensitivity analysis: fundamentals
2015
Sensitivity analysis (SA) is a valuable tool to support the use of mathematical models for environmental systems. Local or global SA (namely, LSA and GSA) are performed in order to better understand processes and to select the most influential factors affecting processes. The main objective of this extended abstract is to provide an informed problem statement of the issues surrounding LSA and GSA applications in the environmental water quality modelling field. Specifically, this paper aims at identifying, for the most popular methods, their potential use, the critical issues to be solved and the limits identified in a comprehensive literature review.
Variance-based sensitivity analysis for wastewater treatment plant modelling
2014
Global sensitivity analysis (GSA) is a valuable tool to support the use of mathematical models that characterise technical or natural systems. In the field of wastewater modelling, most of the recent applications of GSA use either regression-based methods, which require close to linear relationships between the model outputs and model factors, or screening methods, which only yield qualitative results. However, due to the characteristics of membrane bioreactors (MBR) (non-linear kinetics, complexity, etc.) there is an interest to adequately quantify the effects of non-linearity and interactions. This can be achieved with variance-based sensitivity analysis methods. In this paper, the Extend…
Global sensitivity analysis in ASM applications: comparison of the SRC and Extended-FAST method for a UCT-MBR model
2011
In this study global sensitivity analysis is performed to identify influential as well as non-influential parameters in a model of a University Cape Town Membrane Bioreactor (UCT-MBR). In particular, the Standardised Regression Coefficients (SRC) and Extended-FAST sensitivity analysis methods are applied. The sensitivity of model variables towards parameter variation is analysed for CODTOT, SNH4, SNO3, SPO, and MLSS along five reactor compartments. Both methods indicate that the parameters identified as being influential differ from section to section due to the different processes involved. Moreover, the relevant influence of the membrane filtration parameters is detected in the first plan…