Effects of screened Coulomb impurities on autoionizing two-electron resonances in spherical quantum dots

In a recent paper (Phys. Rev. B {\bf 78}, 075316 (2008)), Sajeev and Moiseyev demonstrated that the bound-to-resonant transitions and lifetimes of autoionizing states in spherical quantum dots can be controlled by varying the confinment strength. In the present paper, we report that such control can in some cases be compromised by the presence of Coulomb impurities. It is demonstrated that a screened Coulomb impurity placed in the vicinity of the dot center can lead to bound-to-resonant transitions and to avoided crossings-like behavior when the screening of the impurity charge is varied. It is argued that these properties also can have impact on electron transport through quantum dot arrays

Keystroke logging – a didactic tool for analysis and development of writing and language skills

Proceedings of the Workshop on NLP for Reading and Writing – Resources, Algorithms and Tools (SLTC 2008). Editors: Rickard Domeij, Sofie Johansson Kokkinakis, Ola Knutsson and Sylvana Sofkova Hashemi. NEALT Proceedings Series, Vol. 3 (2009), 12-13. © 2009 The editors and contributors. Published by Northern European Association for Language Technology (NEALT) http://omilia.uio.no/nealt . Electronically published at Tartu University Library (Estonia) http://hdl.handle.net/10062/4116

Digital Maps for Linguistic Diversity

Peer reviewe

Dinamika vrednot tujih jezikov na Švedskem: socialna zgodovina

This paper gives an account of the history of foreign language values in Sweden from the seventeenth century to the present. The paper is informed by sociocultural standpoints on language and language learning according to which language is a dynamic tool that is appropriated by individuals to achieve particular purposes, and that dialogically creates and renews our social world(s). Since the sixteenth century, three languages (German, French and English) have been taught in Sweden as foreign languages during particular eras. In this paper, we explore how language value can be understood as a system that evolves over time as a result of triggers such as power, trade and personal benefits. The impact of these variables on Swedish society’s efforts to invest in learning a particular language during specific eras is critically examined from the perspectives of nested systems. (DIPF/Orig.

Honesty of Larval Begging Signals Covaries With Colony Kin Structure in Formica Ants

Social insects live in highly complex societies with efficient communication systems. Begging is one display commonly used by offspring to signal their nutritional state, however begging behavior has received very little attention in social insects. Theory predicts that begging can be either an honest (i.e., honest-signaling strategy) or a dishonest (i.e., scrambling competition) signal of need, with dishonest signals expected to be more likely when relatedness within the group is low. To investigate the presence and honesty of begging, as well as the nature of the involved signals, we used a comparative approach with four species of the ant genus Formica known to differ in the degree of intra-colony relatedness. We investigated the behavior of starved and non-starved larvae of F. aquilonia, F. pressilabris (both low intra-colony relatedness), F. exsecta (intermediate relatedness), and F. fusca (high relatedness). In addition, we assessed the attraction of conspecific workers toward odors extracted from these two classes of larvae and analyzed the larval cuticular hydrocarbon profiles. We found that in F. fusca and F. exsecta, larvae signaled significantly more when starved. In contrast, larvae of F. aquilonia signaled significantly more when they were non-starved, while there was no significant difference in the behavior of starved vs. non-starved larvae in F. pressilabris. Our results show that workers were not preferentially attracted to the odor of starved larvae, and we also did not detect any differences between the cuticular hydrocarbon profiles of starved and non-starved larvae. Overall, this study demonstrates among species variation in larval hunger signaling in Formica ants, and encourages further studies to confirm the link between kin structure variation and the honesty of begging signals.Peer reviewe

Climate Warming and Tick-borne Encephalitis, Slovakia

Increased tick-borne encephalitis (TBE) cases have been reported in central Europe. To investigate temporal trends in the altitude at which TBE cases occur in Slovakia, we analyzed the number of TBE cases during 1961–2004. Since 1980, TBE cases moved from lowlands to submountainous areas, most likely because of rising temperature

Functional network connectivity and topology during naturalistic stimulus is altered in first-episode psychosis

Background: Psychotic disorders have been suggested to derive from dysfunctional integration of signaling between brain regions. Earlier studies have found several changes in functional network synchronization as well as altered network topology in patients with psychotic disorders. However, studies have used mainly resting-state that makes it more difficult to link functional alterations to any specific stimulus or experience. We set out to examine functional connectivity as well as graph (topological) measures and their association to symptoms in first-episode psychosis patients during movie viewing. Our goal was to understand whole-brain functional dynamics of complex naturalistic information processing in psychosis and changes in brain functional organization related to symptoms. Methods: 71 first-episode psychosis patients and 57 control subjects watched scenes from the movie Alice in Wonderland during 3 T fMRI. We compared functional connectivity and graph measures indicating integration, segregation and centrality between groups, and examined the association between topology and symptom scores in the patient group. Results: We identified a subnetwork with predominantly decreased links of functional connectivity in firstepisode psychosis patients. The subnetwork was mainly comprised of nodes of and links between the cinguloopercular, sensorimotor and default-mode networks. In topological measures, we observed between-group differences in properties of centrality. Conclusions: Functional brain networks are affected during naturalistic information processing already in the early stages of psychosis, concentrated in salience- and cognitive control-related hubs and subnetworks. Understanding these aberrant dynamics could add to better targeted cognitive and behavioral interventions in the early stages of psychotic disorders.Peer reviewe

Physical Education Teacher’s Professional Learning of Implementing a Health Promotion Intervention in the Practice of a Research Circle

Scholars recommend that health promotion researchers engage practitioners in the analysis and reporting phase and expand their ability to share their research beyond academia. The purpose of this study was to draw benefit from physical education (PE) teachers’ discussions and reflections of the implementation of a health promotion intervention in school during research circle meetings. The health promotion intervention ‘Pulse for Health and Learning’ (PuLH) focused on moderate-to-vigorous physical activity, incorporating a child-centred coaching approach. This study has an action research approach. The research circle consisted of PE teachers (N = 22, approximately 18 per meeting) from eight primary and middle schools (from grades 4 to 9) in eight municipalities in Sweden and three researchers. The theory of ‘practice architectures’ was employed to interpret, discuss, and clarify what enables and constrain PE teachers’ implementation of the health promotion intervention. During the analysis, three discourses were identified: technical-rational discourse, participating discourse, and steering and supporting discourse. The practice architectures both enabled and constrained the implementation of PuLH. The research circle meetings stimulated critically conscious acting and decision-making through collaboration between PE teachers and together with researchers which improved the implementation of PuLH and contributed to PE teachers’ professional development

Assessing Error Correlations in Remote Sensing-Based Estimates of Forest Attributes for Improved Composite Estimation

Today, non-expensive remote sensing (RS) data from different sensors and platforms can be obtained at short intervals and be used for assessing several kinds of forest characteristics at the level of plots, stands and landscapes. Methods such as composite estimation and data assimilation can be used for combining the different sources of information to obtain up-to-date and precise estimates of the characteristics of interest. In composite estimation a standard procedure is to assign weights to the different individual estimates inversely proportional to their variance. However, in case the estimates are correlated, the correlations must be considered in assigning weights or otherwise a composite estimator may be inefficient and its variance be underestimated. In this study we assessed the correlation of plot level estimates of forest characteristics from different RS datasets, between assessments using the same type of sensor as well as across different sensors. The RS data evaluated were SPOT-5 multispectral data, 3D airborne laser scanning data, and TanDEM-X interferometric radar data. Studies were made for plot level mean diameter, mean height, and growing stock volume. All data were acquired from a test site dominated by coniferous forest in southern Sweden. We found that the correlation between plot level estimates based on the same type of RS data were positive and strong, whereas the correlations between estimates using different sources of RS data were not as strong, and weaker for mean height than for mean diameter and volume. The implications of such correlations in composite estimation are demonstrated and it is discussed how correlations may affect results from data assimilation procedures