Hale W.W.,University Utrecht |
Crocetti E.,University of Macerata |
Raaijmakers Q.A.W.,University Utrecht |
Meeus W.H.J.,University Utrecht
Journal of Child Psychology and Psychiatry and Allied Disciplines | Year: 2011
Background: Accumulating studies have demonstrated that the Screen for Child Anxiety Related Emotional Disorders (SCARED), a modern youth anxiety questionnaire with scales explicitly designed to map onto specific DSM-IV-TR anxiety disorders, has good psychometric properties for children and adolescents from various countries. However, no study has yet been conducted as to the overall strength of the psychometric properties found in these studies. Methods: Studies were collected from the PsycINFO, PubMed, SSCI, SCI-Expanded, ERIC, and A&HCI databases from the year of the SCARED's first publication (1997) to the present. The inclusion criteria focused on all studies that examined the psychometric properties of the SCARED. Results: We retained 21 articles, reporting a total of 25 studies from predominately Europe (Belgium, Germany, Italy, the Netherlands) and the USA, as well as South Africa and China, which matched our inclusion criteria. It was found that the psychometric properties were robust for the SCARED scales related to the symptoms of DSM-IV-TR anxiety disorders, that females scored significantly higher than males and that age had a moderating effect on male and female score differences. Conclusions: This meta-analysis suggests that the SCARED can be utilized as a screening instrument for DSM-IV-TR anxiety disorder symptom dimensions for children and adolescents from various countries. © 2010 The Authors. Journal of Child Psychology and Psychiatry. © 2010 Association for Child and Adolescent Mental Health.
Crocetti E.,University of Macerata |
Jahromi P.,Stanford University |
Meeus W.,University Utrecht
Journal of Adolescence | Year: 2012
The purpose of this study was to examine the links between identity (statuses and processes) and adolescent civic engagement (volunteer and political participation). Participants were 392 Italian high school students (42% males) aged 14-20 years (. M age = 16.23 years; . SD age = 1.53) who completed a self-report questionnaire. First, using a person-centered approach, we found that achieved adolescents were more involved in volunteer activities, reported higher civic efficacy, and stronger aspirations to contribute to their communities than their diffused counterparts. Second, by means of a variable-centered approach, we demonstrated that the link between identity processes (i.e., commitment and in-depth exploration) and past and future volunteer and political participation was mediated by social responsibility. Implications of the findings for current understanding of the link between adolescent identity formation and civic engagement are discussed and suggestions for future research are outlined. © 2011 The Foundation for Professionals in Services for Adolescents.
Minervini L.F.,University of Macerata
Telecommunications Policy | Year: 2014
Unparalleled growth in wireless communications has increased the pressure for more spectrum to support more users, more uses and more capacity. To alleviate that pressure, major regulatory changes were introduced in several countries in two key areas of spectrum management, namely spectrum assignment and allocation. This paper analyzes those changes and discusses strategies and tactics for deregulating the use of radio spectrum. Spectrum management reforms are considered within the theoretical framework of transition economics, which is concerned with optimal reform speed and sequencing. The paper shows how Anglo-Saxon and European countries have been implementing gradual reforms. Meanwhile, Central American reformers have chosen a fast transition from command-and-control regulation to market mechanisms. Transition economics is used to evaluate the advantages and drawbacks of different spectrum reform strategies. © 2013 Elsevier Ltd.
Buonanno F.,University of Macerata
Biologia | Year: 2011
It is known that the microturbellarian Stenostomum sphagnetorum, a common ciliate predator, is very sensitive against different types of toxins produced by other ciliates for chemical defense, and consequently, it is not able to capture and ingests these ciliates. In particular, when the predator tries to attack one of these toxin-secreting ciliates, it is forced to regurgitate the captured prey in response to the toxin discharged from the ciliates. In this study it is shown that after repeated attacks by S. sphagnetorum against two species of toxic ciliates (Spirostomum ambiguum and Spirostomum teres), the predator acquires a behavior of prey selection that leads to the exclusion of these ciliates among the possible prey and to the distinction between edible and inedible (toxic) ciliates. This learned behavior, which is maintained for days, is lost only after the asexual reproduction of the microturbellarian. In addition, S. sphagnetorum learns to recognize and avoid specimens of S. ambiguum and S. teres artificially deprived of their toxins, strongly suggesting that the toxins are not exclusively associated in the prey recognition of the microturbellarian. © 2011 Versita Warsaw and Springer-Verlag Wien.
Cerqueti R.,University of Macerata
Journal of Global Optimization | Year: 2012
This paper deals with a theoretical stochastic dynamic optimization model for the external financing of firms. We aim at searching for the best intensity of payment that a financier has to apply to a company in order to have a loan repaid. The techniques involved are related to the optimal control theory with exit time. We follow a dynamic programming approach. Our model also presents a distinction between the legal and the illegal financier, and a theoretical comparison analysis of the results is presented. Some numerical examples provide further validation of the theoretical results. © Springer Science+Business Media, LLC 2012.