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Hanisch C.,Dusseldorf University of Applied Sciences | Hautmann C.,University of Cologne | Pluck J.,University of Cologne | Eichelberger I.,University of Cologne | Dopfner M.,University of Cologne
Journal of Child Psychology and Psychiatry and Allied Disciplines | Year: 2014

Background: Our indicated Prevention program for preschool children with Externalizing Problem behavior (PEP) demonstrated improved parenting and child problem behavior in a randomized controlled efficacy trial and in a study with an effectiveness design. The aim of the present analysis of data from the randomized controlled trial was to identify the mediating processes that account for these positive treatment effects. We hypothesized that a decrease in negative parenting and increases in positive parenting and parental warmth would mediate the relationship between treatment and child improvement. Method: Parents of 155 children were randomly assigned to the PEP intervention group (n = 91) or a nontreated control group (n = 64). Parents rated their child's problem behavior and their own parenting practices before and after PEP training. Parental warmth was assessed during standardized play situations. Four mediation models were tested using structural equation modeling. Trial registration number ISRCTN12686222; http://www.controlled-trials.com/isrctn/pf/ 12686222. Results: Changes in child externalizing problem behavior were most strongly mediated by reductions of negative parenting in difficult parenting situations. Increases in positive parenting also served as a mediator. Changes in parental warmth, parents' feeling of self-efficacy, and parental mental health did not play a mediating role in the association between PEP treatment and child behavior. Conclusions In our program, the most important component was to teach parents how to reduce dysfunctional parenting strategies in conflict situations. © 2013 The Authors. Journal of Child Psychology and Psychiatry © 2013 Association for Child and Adolescent Mental Health. Source

Enhancing Development of Children at Risk and Their Parents by Video Counselling According to the Marte Meo Method Marte Meo is a low-intensity programme of counselling parents and other persons significantly involved with children which aims to foster parenting capacity and facilitate child development. The article describes a preliminary pilot study with the aim of identifying variables for the future evaluation of efficacy and effectiveness of the Marte Meo method. © Vandenhoeck & Ruprecht GmbH & Co. KG. Source

Baekler P.,Dusseldorf University of Applied Sciences | Hehl F.W.,University of Cologne | Hehl F.W.,University of Missouri
Classical and Quantum Gravity | Year: 2011

Recently, gravitational gauge theories with torsion have been discussed by an increasing number of authors from a classical as well as from a quantum field theoretical point of view. The Einstein-Cartan(-Sciama-Kibble) Lagrangian has been enriched by the parity odd pseudoscalar curvature (Hojman, Mukku and Sayed) and by torsion square and curvature square pieces, likewise of even and odd parity. (i) We show that the inverse of the so-called Barbero-Immirzi parameter multiplying the pseudoscalar curvature, because of the topological Nieh-Yan form, can be appropriately discussed if torsion square pieces are included. (ii) The quadratic gauge Lagrangian with both parities, proposed by Obukhov et al and Baekler et al, emerges also in the framework of Diakonov et al. We establish the exact relations between both approaches by applying the topological Euler and Pontryagin forms in a Riemann-Cartan space expressed for the first time in terms of irreducible pieces of the curvature tensor. (iii) In a Riemann-Cartan spacetime, that is, in a spacetime with torsion, parity-violating terms can be brought into the gravitational Lagrangian in a straightforward and natural way. Accordingly, Riemann-Cartan spacetime is a natural habitat for chiral fermionic matter fields. © 2011 IOP Publishing Ltd. Source

Baekler P.,Dusseldorf University of Applied Sciences | Hehl F.W.,University of Cologne | Hehl F.W.,University of Missouri | Nester J.M.,National Central University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

We propose a cosmological model in the framework of the Poincaré gauge theory of gravity (PG). The gravitational Lagrangian is quadratic in both curvature and torsion. In our specific model, the Lagrangian contains (i) the curvature scalar R and the curvature pseudoscalar X linearly and quadratically (including an RX term) and (ii) pieces quadratic in the torsion vector V and the torsion axial vector A (including a VA term). We show generally that in quadratic PG models we have nearly the same number of parity conserving terms ("world") and of parity violating terms ("shadow world"). This offers new perspectives in cosmology for the coupling of gravity to matter and antimatter. Our specific model generalizes the fairly realistic "torsion cosmologies" of Shie-Nester-Yo (2008) and Chen et al. (2009). With a Friedman type ansatz for an orthonormal coframe and a Lorentz connection, we derive the two field equations of PG in an explicit form and discuss their general structure in detail. In particular, the second field equation can be reduced to first order ordinary differential equations for the curvature pieces R(t) and X(t). Including these along with certain relations obtained from the first field equation and curvature definitions, we present a first order system of equations suitable for numerical evaluation. This is deferred to the second, numerical part of this paper. © 2011 The American Physical Society. Source

Anders D.,University of Siegen | Weinberg K.,University of Siegen | Reichardt R.,Dusseldorf University of Applied Sciences
Computational Materials Science | Year: 2012

In modern technical applications diverse multiphase mixtures are used to meet demanding mechanical, chemical and electrical requirements. Consequently multicomponent systems such as biological tissues in medical science, metallic alloys or polymer solutions occupy a crucial role in everyday life. Therefore the material specific modulation of these systems and their application became a subject of recent studies. In this contribution we will study the impact of thermal diffusion (Ludwig-Soret effect) on the microstructural evolution of the binary polymer blend consisting of poly(dimethylsiloxane) and poly(ethyl-methylsiloxane). This polymer blend has a wide range of applications such as coating implementations and cosmetics manufacturing. For this reason we focus on diffusion induced phase separation and coarsening in the presence of a local non-uniform temperature field. In order to capture the microstructural evolution we apply a Cahn-Hilliard phase-field model, which is here extended by an additional thermal diffusivity. The diffusion equation under consideration constitutes a partial differential equation involving spatial derivatives of fourth order. Thus, the variational formulation of the problem requires approximation functions which are piecewise smooth and globally C 1-continuous. In this paper we employ the innovative isogeometric concept of finite element analysis in order to fulfill this demanding continuity requirement. A concluding comparison of experimental observations and numerical simulations of phase separation in the presence of local temperature fields of a critical PDMS/PEMS polymer blend will illustrate the flexibility and versatility of our approach. © 2011 Elsevier B.V. All rights reserved. Source

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