Problematic Internet Use in early adolescence: The role of attachment and negative beliefs about worry

AbstractBackground and aimsProblematic Internet Use (PIU) might be a potential mental health problem. Few studies have investigated the relative contribution of individual and family factors in the development of PIU in early adolescence. The aim of the current study was to model the relationship between attachment styles, negative beliefs about worry, and PIU in early adolescence.MethodsFive hundred and thirty-eight Italian early adolescents (51% females, M age = 12.7 years, SD = 0.87) were included in this study. The pattern of relationships specified by the theoretical model was examined through path analysis.ResultsResults showed that avoidance (mother) and anxiety (father) were directly associated with PIU. Anxiety (mother) and avoidance (father) were indirectly associated with PIU via negative beliefs about worry.Discussion and conclusionsOverall, our findings show that attachment toward mother and father are differently linked to PIU and that negative beliefs about worry may play a mediating role in the association between attachment and PIU. Findings are discussed within clinical and preventive implications

Ética, pesquisa e imagem de povos indígenas

Este artigo explora dois temas principais: a) a centralidade das imagens na cultura contemporânea b) e o candente debate sobre questões éticas em pesquisa a partir da aplicação do modelo biomédico às ciências humanas. Ele explora a ética e a pesquisa em educação com foco na legislação que regulamenta a pesquisa com povos indígenas. O texto ainda argumenta que a reiteração de certas imagens constitui uma poderosa iconografia sobre os povos indígenas, a qual contribui para naturalizar certas representações sobre eles. Finalmente, o artigo também defende que seria oportuno garantir práticas éticas pluralistas (de mudança e ética circunstancial de pesquisa em educação) em vez de considerar um conjunto de princípios e condutas éticas predeterminado.This paper explores two main topics: a) the centrality of images in the contemporary culture, b) and the burning debate on ethical issues in research concerning the application of the biomedical model to the human sciences. It explores ethics and research in education focusing on the legislation that regulates the research with indigenous people. The paper argues that the reiteration of certain images constitutes a powerful iconography on indigenous peoples, which contributes to naturalize certain representations about them. Finally, this paper also advocates that would be appropriate ensure pluralist ethical practices (of changing and circumstantial ethics of research in education) rather than to consider a set of pre-given ethical principles and conducts

Why cultural studies?

Por Que Estudos Culturais? Argumenta-se, neste texto, que a vitalidade dos Estudos Culturais está na abertura e receptividade para promover enlaces conceituais e teóricos variados. De modo a adensar a discussão sobre o frutífero encontro entre Estudos Culturais e Educação, no presente artigo promove-se um rastreamento de pesquisas sobre natureza e, também, daquelas dedicadas às temáticas indígenas e afro-brasileiras de modo a indicar enlaces teóricos, caminhos investigativos e pontos de atenção promovidos por pesquisadores identificados com este campo articulatório. Observa-se que, como parte de um projeto ético-político mais amplo, estes estudos questionam essencialismos, fundamentalismos, eurocentrismos, racismos e acenam para possíveis formas de resistência político-acadêmica.Why Cultural Studies? In this text it is argued that the vitality of Cultural Studies is in its openness and receptivity to promote varied conceptual and theoretical articulations. In order to deepen the analysis on the productive encounter between Cultural Studies and education, this article makes a survey of researchs on nature and, also, of those themes dedicated to indigenous and afro-Brazilians. It is done in order to indicate theoretical articulations, investigative paths and points of attention promoted by researchers identified with this articulatory field. As part of a broader ethicalpolitical project, it is observed that these studies question essentialisms, fundamentalisms, eurocentris

Reaching the Oldest Stars beyond the Local Group: Ancient Star Formation in UGC 4483

We present new WFC3/UVIS observations of UGC 4483, the closest example of a metal-poor blue compact dwarf galaxy, with a metallicity of Z ≃ 1/15 Z⊙ and located at a distance of D ≃ 3.4 Mpc. The extremely high quality of our new data allows us to clearly resolve the multiple stellar evolutionary phases populating the color-magnitude diagram (CMD), to reach more than 4 mag deeper than the tip of the red giant branch, and to detect for the first time core He-burning stars with masses ≲2 M⊙, populating the red clump and possibly the horizontal branch (HB) of the galaxy. By applying the synthetic CMD method to our observations, we determine an average star formation rate over the whole Hubble time of at least $(7.01\pm 0.44)\times {10}^{-4}$ ${M}_{\odot }\,{{yr}}^{-1}$ , corresponding to a total astrated stellar mass of $(9.60\pm 0.61)\times {10}^{6}$ M⊙, 87% of which went into stars at epochs earlier than 1 Gyr ago. With our star formation history recovery method we find the best fit with a distance modulus of DM = 27.45 ± 0.10, slightly lower than previous estimates. Finally, we find strong evidence of an old (≳10 Gyr) stellar population in UGC 4483 thanks to the detection of an HB phase and the identification of six candidate RR Lyrae variable stars. * Based on observations obtained with the NASA/ESA Hubble Space Telescope at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy under NASA Contract NAS 5-26555

Differential cross section measurements for the production of a W boson in association with jets in proton–proton collisions at √s = 7 TeV

Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb[superscript −1]. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph + pythia and sherpa, and to next-to-leading-order calculations from BlackHat + sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio

Optimasi Portofolio Resiko Menggunakan Model Markowitz MVO Dikaitkan dengan Keterbatasan Manusia dalam Memprediksi Masa Depan dalam Perspektif Al-Qur`an

Risk portfolio on modern finance has become increasingly technical, requiring the use of sophisticated mathematical tools in both research and practice. Since companies cannot insure themselves completely against risk, as human incompetence in predicting the future precisely that written in Al-Quran surah Luqman verse 34, they have to manage it to yield an optimal portfolio. The objective here is to minimize the variance among all portfolios, or alternatively, to maximize expected return among all portfolios that has at least a certain expected return. Furthermore, this study focuses on optimizing risk portfolio so called Markowitz MVO (Mean-Variance Optimization). Some theoretical frameworks for analysis are arithmetic mean, geometric mean, variance, covariance, linear programming, and quadratic programming. Moreover, finding a minimum variance portfolio produces a convex quadratic programming, that is minimizing the objective function ðð¥with constraintsð ð 𥠥 ðandð´ð¥ = ð. The outcome of this research is the solution of optimal risk portofolio in some investments that could be finished smoothly using MATLAB R2007b software together with its graphic analysis

Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good