Search results for "validation"

Simultaneous determinations of zirconium, hafnium, yttrium and lanthanides in seawater according to a co-precipitation technique onto iron-hydroxide

2013

Very low concentrations (pg mL 1 or sub-pg mL 1 level) along with the high salinity are the main problems in determining trace metal contents in seawater. This problem is mainly considered for investigations of naturally occurring YLOID (Y and Lanthanides) and Zr and Hf in order to provide precise and accurate results. The inductively coupled plasma mass spectrometry (ICP-MS), both in high and low resolution, offers many advantages including simultaneous analyses of all elements and their quantitative determination with detection limits of the order of pg mL 1. However in the analysis of YLOID in seawater, a better determination needs an efficient combination of ICP-MS measurement with a pr…

Speeding up the Consensus Clustering methodology for microarray data analysis

2010

Abstract Background The inference of the number of clusters in a dataset, a fundamental problem in Statistics, Data Analysis and Classification, is usually addressed via internal validation measures. The stated problem is quite difficult, in particular for microarrays, since the inferred prediction must be sensible enough to capture the inherent biological structure in a dataset, e.g., functionally related genes. Despite the rich literature present in that area, the identification of an internal validation measure that is both fast and precise has proved to be elusive. In order to partially fill this gap, we propose a speed-up of Consensus (Consensus Clustering), a methodology whose purpose…

Special Issue on Analysing, Modelling and Visualizing Spatial Environmental Data (Part1)

2012

Pressure drop at low reynolds numbers in woven-spacer-filled channels for membrane processes: CFD prediction and experimental validation

2017

The energy consumption due to pumping power is a crucial issue in membrane processes. Spacers provide mechanical stability and promote mixing, yet increasing pressure drop. Woven spacers and their behaviour at low Reynolds numbers are less studied in the literature. Nevertheless, they are typical of some membrane technologies, as reverse electrodialysis (RED). RED is a promising technology for electric power generation by the chemical potential difference of two salt solutions within a stack equipped by selective ion-exchange membranes. The mechanical energy required for pumping the feed solutions, can dramatically reduce the net power output. In this work computational fluid dynamics (CFD)…

Fixed speed wind turbine generator model validation and dynamic simulation using Matlab/Simulink

2007

In the last two decades an increasing amount of electricity has been generated from renewable sources in order to mitigate the environmental impact of the conventional power plants. In the next future wind turbines may affect the behaviour of electrical power system. This paper describes the model of a typical fixed speed wind turbine connected to the grid; the model is developed in the simulation tool Matlab/Simulink. It’s composed by the aerodynamic system, the shaft model (two-mass system), the induction generator (fifth order model) and the stall control system of the wind turbine rotor. The validation of the wind turbine model is made in steady-state operation, and the results are veri…

Automatic classification of acoustically detected krill aggregations: A case study from Southern Ocean

2022

Acoustic surveys represent the standard methodology to assess the spatial distribution and abundance of pelagic organisms characterized by aggregative behaviour. The species identification of acoustically observed aggregations is usually performed by taking into account the biological sampling and according to expert-based knowledge. The precision of survey estimates, such as total abundance and spatial distribution, strongly depends on the efficiency of acoustic and biological sampling as well as on the species identification. In this context, the automatic identification of specific groups based on energetic and morphological features could improve the species identification process, allo…

The Italian Validation of Singelis’s Self-Construal Scale (SCS): a Short 10-Item Version Shows Improved Psychometric Properties

2015

This study validates an Italian version of Singelis’s Independent and Interdependent Self-Construal Scale (SCS; Singelis in Personality and Social Psychology Bulletin, 20, 580–591, 1994; Singelis et al. in Cross-Cultural Research, 29, 240–275, 1995), a scale intended to measure individuals' feelings of connectedness to and separateness from social situations. Results of the Italian validation, carried out through three studies involved a total of 803 Italian university students, has led to a short 10-item version, with two 5-item orthogonal factors respectively reflecting independent self-construal and interdependent self-construal. The new short version of Singelis’s scale, as examined thr…

Measurement invariance of the nine-item Internet Gaming Disorder Scale (IGDS9-SF) across Albania, USA, UK, and Italy

2018

The IGDS9-SF, which assesses Internet Gaming Disorder behaviors, has been validated in a number of countries (Portugal, Italy, Iran, Slovenia), although the psychometric equivalence of the instrument has been assessed only across Australia, the USA, the UK, and India. This research aimed at providing further cross-cultural insights into IGD by assessing the factorial structure of the IGDS9-SF in Albania and investigating its measurement invariance across Albanian, Italian, American, and British gamers. Multi-Group Confirmatory Factor Analyses were performed on a sample of 1411 participants from Albania (n = 228), USA (n = 237), the UK (n = 275), and Italy (n = 671). The CFAs confirmed the s…

Spanish validation of the Sexual Addiction Screening Test.

2018

Background and aims Sexual addiction is a pathological behavior characterized by a combination of excessive sexual desire and impaired ability to control it. Its incidence ranges between 1.2% and 32.2%, although this number may vary depending on the screening tool used. This wide variability is largely due to the use of non-validated instruments (e.g., structural validity relying on exploratory analyses, instruments translated without an additional validation process, or instruments validated in another format). To deal with these limitations, this study tested the psychometric properties of the Spanish paper-and-pencil and online versions of the Sexual Addiction Screening Test (SAST). Met…

Eine Validierungsstudie der deutschen Version des Hypersexual Behavior Inventory (HBI)

2013

Hypersexuelles Erleben und Verhalten umfasst gemas der aktuell diskutierten diagnostischen Kriterien wiederkehrende und intensive sexuelle Fantasien, sexuelles Verlangen oder sexuelle Verhaltensweisen, die zu klinisch relevantem personlichen Leidensdruck oder Funktionseinbusen im sozialen oder beruflichen Umfeld oder in anderen wichtigen Bereichen fuhren konnen. Das Hypersexual Behavior Inventory (HBI, Reid et al., 2011) dient der Erfassung hypersexuellen Erlebens und Verhaltens anhand von 3 Faktoren (Coping, Kontrolle und Konsequenzen). Die vorliegende Studie diente der Uberprufung der psychometrischen Eigenschaften der deutschen Version des HBI. Im Rahmen einer Online-Studie wurde die deu…