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The detailed study of crystals and the dynamics of the melting process in two and three dimensions is a fundamental and interesting research topic, which is important for increasing our knowledge of solid state physics. In natural crystals, structure information can be obtained principally by Bragg-scattering of neutrons, electrons or photons on the crystal, followed by an analysis in Fourier space. Dynamical aspects cannot be investigated in these systems. Recently, a new crystalline system was discovered whose properties are such that the melting transition can be investigated in great detail — the ‘plasma crystal’. This article presents the results of such an investigation and shows evidence for the existence of intermediate phases between the solid, liquid and gaseous phases. The observed ‘structured’ phase transition may be specific for plasma crystals but, alternatively, it may indicate the existence of intermediate stages in the melting transition more generally. 相似文献
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Prof. Dr. Vera Moser Dr. Jan Kuhl Hubertus Redlich Lea Schäfer 《Zeitschrift für Erziehungswissenschaft》2014,17(4):661-678
The implementation of inclusion in schools currently requires new reflections of competence profiles of the teachers involved. Especially in elementary school, which can so far be considered as the most developed institution of inclusive schooling in Germany, questions of differences in the profiles of elementary and special education teachers have been raised. As professional skills also have motivational and volitional aspects, a beliefs model (domain overlapping) was developed based on the construction of the TEDS-M research project, which aims to study specific special educational beliefs. Using a quantitative questionnaire designed in the context of a corresponding preliminary investigation a three-factor-solution for mapping a special supportive belief profile among student teachers and teachers in the field of elementary and special education was tested. Initially this profile model was confirmed by the results of a subsequent analysis based on a nationwide sample of elementary school and special education students (N = 951). In addition to these findings different manifestations of the beliefs model could be identified among student teachers for elementary schools and student teachers for special education. 相似文献
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Quas JA Goodman GS Ghetti S Alexander KW Edelstein R Redlich AD Cordon IM Jones DP 《Monographs of the Society for Research in Child Development》2005,70(2):vii, 1-vii128
We report a longitudinal study of long-term outcomes of participating in criminal cases following child sexual abuse (CSA). In the 1980s, 218 child victim/witnesses took part in a study of short-term sequelae of legal involvement. Approximately 12 years later, 174 of them, as well as a comparison group of 41 matched individuals with no CSA history, were interviewed about their mental health and legal attitudes. Being young when the legal case started was associated with poorer later adjustment. Additionally, even when controlling for psychological problems at the start of the legal case and other familial, CSA, and life stressors, testifying repeatedly in childhood predicted poorer current functioning. These associations were often moderated by the severity of both the CSA and the perpetrator's sentence: Testifying repeatedly in cases involving severe abuse, and not testifying when the perpetrator received a light sentence, predicted poorer current mental health. In partial contrast to the mental health results, being older when the case began and the perpetrator receiving a lenient sentence predicted more negative feelings about the legal system. In addition, not having testified when the perpetrator received a light sentence predicted more negative legal attitudes. Individuals' emotional reactions while waiting to testify and while actually testifying were also associated with their current mental health and attitudes toward the legal system: Greater distress predicted poorer adjustment, especially in individuals who were adolescents when they went to court. Greater distress also predicted more negative attitudes. Finally, when the former CSA victim/witnesses were compared with individuals with no CSA history, the former reported poorer adjustment and more negative feelings about the legal system. Results have implications for multilevel-transactional models of development, for understanding developmental sequelae of legal involvement following childhood trauma, and for social policy concerning the treatment of child victim/witnesses. 相似文献
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Hubertus F. von Bremen 《Journal of The Franklin Institute》2010,347(1):315-338
A general method for accurately computing the Lyapunov characteristic exponents (LCEs) of continuous dynamical systems has been developed in [10]. In this paper, this method is extended to implementations on systems of arbitrary dimensions. An accurate implementation of the extension of the method to compute LCEs that uses available numerical techniques is presented for systems of arbitrary dimensions. Previously in [10], the original approach had only been implemented for general systems of up to dimension three. Closed form expressions for the exponential of skew symmetric matrices of order 4 and 5 will be presented. These formulas are used to obtain an accurate and efficient implementation of the method for dynamical systems of dimensions 4 and 5. Numerical examples illustrating the accuracy of the implementations are presented. 相似文献
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