Search results for "quantitative"
showing 10 items of 2409 documents
I hate my workplace but I am very attached to it: workplace attachment style
2017
Purpose The purpose of this paper is to investigate whether different patterns of workplace attachment exist and to explore the relations between adult attachment styles and the level of workplace attachment. Design/methodology/approach Participants were 351 Italian employees who completed a questionnaire composed of the Workplace Attachment Scale and the Relationship Questionnaire. Data were analyzed using correspondence analysis. Findings The results showed that high scores on workplace attachment correlated significantly with secure attachment style, while low scores correlated with insecure attachment styles. These results shed light on different workplace attachment styles. Research l…
Factors and information sources influencing students' consumer behaviour: a case study at an Italian public university
2018
This article examines the factors and the preferred sources of information that influence prospective Italian students' choice of a Department of Business and Economics at a public university. Results, based on quantitative survey data, show that both future undergraduate and future postgraduate students value the reputation of the university, the guidance services offered by the institution and the degree of specialisation as important factors that drive their choice, and peers' suggestions are the most relevant information source for both groups. The paper provides insights on how traditional elements are combined with more contemporary ones in domestic Students' Consumer Behaviour. Findi…
Risks Management Profile in Local Public Services Administration
2015
Abstract This paper aims improving local public services practices, at least, for our national local communities’ administration. Such possibilities may arise by case study regarding delegated management of a public entity charged with central heating public service, turned in private company. Paper treats local public finance and reveals the risks of defection management and even fraud risk by periodical re-negotiating of significant contracts with related parties and internal controls deficiency. The moral value of case study is economics considerations over legal considerations prevalence by applying principle of correlating demands with resources, not upside-down. Romanian local public …
Topological linguistics and the study of linguistic variation
1994
Publisher Summary This chapter focuses on topological linguistics and the study of linguistic variation. It discusses the problem of linguistic variation. A topological model has been developed for internal linguistics, starting from the epistemological problem that all linguists must deal with. A topological space could be conceived of as a set of elements where some elements limit the others and are said to be open-sets, and the former and the latter together constitute the closed-sets. Linguistics, when approaching its object of study, is faced with a very similar situation: a language is a set of elements—from utterances to minimal phonic items—where each is described by other surroundi…
Free fatty acids and other volatile compounds for the characterisation of "Vastedda della valle del Belice" cheese.
2010
The analysis of the volatile constituents of “Vastedda della valle del Belìce”, a typical Sicilian pasta filata cheese, was performed using solid phase microextraction and high-resolution gas chromatography/mass spectrometry. The research aimed to verify if the volatile fraction, determinant for cheese flavor, differs among producers and/or production seasons. The samples were provided by four producers from the area of the Protected Designation of Origin (PDO) production, during two different seasons of production. A total of 42 volatile components were identified: the main components were found to be butanoic, hexanoic, octanoic, and decanoic acid. Free fatty acids were quantified using t…
Control Strategy for Induction Motor Drives Based on Decoupling Techniques
1989
Abstract In this work a new closed loop, synchronous microprocessor-based controller is proposed for field oriented controlled induction motor drives, using a PWM voltage source inverter. This controller is based on a non linear state feedback compensator which gives decoupling of both rotor current and rotor flux, and direct and inquadrature components of the stator current vector. The compensator has a linearizing effect on the synchronous model of the electromagnetic circuit of the motor. It follows that the control laws can be obtained using optimal control techniques for linear systems. The controller in question gives directly the conduction sequences of the inverter supplying the ind…
QSPR with descriptors based on averages of vertex invariants. An artificial neural network study
2014
New type of indices, the mean molecular connectivity indices (MMCI), based on nine different concepts of mean are proposed to model, together with molecular connectivity indices (MCI), experimental parameters and random variables, eleven properties of organic solvents. Two model methodologies are used to test the different descriptors: the multilinear least-squares (MLS) methodology and the Artificial Neural Network (ANN) methodology. The top three quantitative structure–property relationships (QSPR) for each property are chosen with the MLS method. The indices of these three QSPRs were used to train the ANNs that selected the best training sets of indices to estimate the evaluation sets of…
QSPR/QSAR Studies of 2-Furylethylenes Using Bond-Level Quadratic Indices and Comparison with Other Computational Approaches
2017
The recently introduced, non-stochastic and stochastic quadratic indices (Marrero-Ponce <em>et al. J. Comp. Aided Mol. Des.</em> 2006, 20, 685-701) were applied to QSAR/QSPR studies of heteroatomic molecules. These novel bond-based molecular descriptors (MDs) were used for the prediction of the partition coefficient (log P), and the antibacterial activity of 34 derivatives of 2-furylethylenes. Two statistically significant QSPR models using non-stochastic and stochastic bond-based quadratic indices were obtained (R<sup>2</sup> = 0.971, s = 0.137 and R<sup>2</sup> = 0.986, s = 0.096). These models showed good stability to data variation in leave-one-out (L…
Determination of pesticides and veterinary drug residues in food by liquid chromatography-mass spectrometry: A review
2015
Monitoring of pesticides and veterinary drug residues is required to enforce legislation and guarantee food safety. Liquid chromatography-mass spectrometry (LC-MS) is the prevailing technique for assessing both types of residues because LC offers a versatile and universal separation mechanism suitable for non-gas chromatography (GC) amenable and the majority of GC-amenable compounds. This characteristic becomes more relevant when LC is coupled to MS because the high sensitivity and specificity of the detector allows to apply generic sample preparation procedures, which simultaneously extract a wide variety of residues with different physico-chemical properties. Determination of metabolites …
Effect of somatic cell count level on functional longevity in Valle del Belice dairy sheep assessed using survival analysis.
2009
The objectives of this study were to evaluate the effect of somatic cell count (SCC) on functional longevity and to estimate the heritability of functional longevity using survival analysis in Valle del Belice dairy sheep. A total of 4,880 lactations of 2,190 ewes from 11 flocks were used. In this study, SCC was considered as an indication of subclinical mastitis. In case of clinical cases, identified by the technicians at milking time, test-day weights and milk samples of those ewes were not considered. Somatic cells were analyzed as counts, without any transformation, and were grouped in 3 classes based on the observed SCC maximum (mxSCC). The mxSCC classes, expressed as 103 cells/mL, wer…