Screw misfit dislocations perpendicular to one or two free surfaces

ABSTRACT

When a screw dislocation pierces one or two free surface(s), noticeable elastic relaxation takes place nearby these surfaces. To refine the theoretical interpretation of an electron microscopy image this relaxation should be included in a precise imaging model. In the present work, the relaxation field is evaluated for a periodic set of misfit screw dislocations normal to the free surface of a semi-infinite or plate-like heterogeneous bicrystal. The proposed approach uses an appropriate combination of known biperiodic elastic fields. For a homogeneous medium and when the period increases, the results around a misfit screw dislocation converge to those of Eshelby and Stroh (1951) who considered an isolated translation screw dislocation.     

Examining the Growth Trajectories of Physical Education Students’ Motivation,Enjoyment, and Physical Activity: A Person-Oriented Approach

The study examined the growth trajectories in 757 (M age = 12.71) Finnish middle school students’ intrinsic and extrinsic motivation along with their enjoyment and physical activity. In addition, the study aimed to examine the role of intrinsic and extrinsic physical education motivation in the development in adolescents’ enjoyment and physical activity by identifying adolescents’ subgroups. Adolescents’ enjoyment and physical activity declined, intrinsic motivation was stable, and extrinsic motivation increased across middle school. Adolescents with highest levels of intrinsic motivation and moderate to high levels of extrinsic regulation had the highest levels of enjoyment and physical activity.     

The Effect of Proximal and Psychological Factors on Future Orientation and Developmental Outcomes: The Case of Palestinian Adolescents in Israel

The main question of this study concerns the future orientation antecedents pertaining family relationship effect on the future orientation of Palestinian adolescent and its outcomes pertaining academic achievement and career expectations. Data were collected from 881 Palestinian adolescents in Israel: 71.4% female participants and 28.60% male participants. Four sets of questionnaires were administered: family atmosphere, intrapersonal variables, higher education domain of future orientation, and developmental outcomes. Structural equation modeling analysis revealed that in the case of girls, future orientation variables are affected by two proximal variables: family environment and family attitudes, whereas in the case of boys, only family environment affects future orientation. In addition, girls’ future orientation affects both career expectation and academic achievements, whereas males’ future orientation affects only career expectation.     

Reliance on schemas in source memory: age differences and similarity of schemas

The present study has examined the effects of source-schema-consistency, schematic distinctiveness and encoding time of schematic information on source memory of younger and older adults. Participants were administered a source memory test, in which two sources presented statements that were congruent with, incongruent with or irrelevant to sources' professions. Professions of sources were schematically similar or distinct, and they were revealed before or after the presentation of items. The results yielded that revelation of profession information before presentation of items enhanced source memory for incongruent items. Aging was associated with a general decrease in source monitoring processes. Participants who were assigned to similar-source condition and had their schemas activated before learning phase had higher source monitoring scores. Results are discussed in relation to source monitoring framework and aging of memory.     

Achievement strategies in peer groups and adolescents' school adjustment and norm-breaking behavior

The present study examined the extent to which the achievement strategies deployed by adolescents, and those used by their peers would predict adolescents' school adjustment, academic achievement and problem behavior. The participants were 287 14–15-year-old comprehensive school students (121 boys and 165 girls) from a middle-sized town in central Sweden. The results showed that not only the maladaptive strategies used by adolescents, but also those reported by their peers predicted adolescents' norm-breaking behavior, low school adjustment and low level of achievement: high levels of failure expectations and task-avoidance among adolescents' peers were positively associated with adolescents' own norm-breaking behavior, and indirectly via this, also with their maladjustment at school and low grades. These associations were found after controlling for the impact of adolescents' own achievement strategies.     

Horizontal and vertical Simon effect: different underlying mechanisms?

Reaction times are usually faster when stimulus and response occur at the same location than when they do not, even if stimulus location is irrelevant to the task (Simon effect). This effect was found with both horizontal and vertical stimulus-response arrangements. The same mechanisms have been proposed to be involved in either case. Here, we compared a horizontal and a vertical Simon task by means of a RT time-course analysis of the Simon effect. Also, we analysed the lateralised readiness potential (LRP), an index of covert response-preparation processes. In the horizontal task, the Simon effect decays over time and pre-activation occurs above the motor cortex ipsilateral to the stimulus. In contrast, the Simon effect does not decay over time and no early incorrect LRP deflection is observed in the vertical task. These findings suggest that typical activation accounts can fit only the horizontal Simon effect, while a translation explanation is more suitable for the vertical Simon effect.     

TRANSCENDENTAL GUILT: On an Emotional Condition of Moral Experience

This article considers a central ethically relevant interpersonal emotion, guilt. It is argued that guilt, as an irreducible moral category, has a constitutive role to play in our ways of conceptualizing our relations to other people. Without experiencing guilt, or being able to do so, we would not be capable of employing the moral concepts and judgments we do employ. Elaborating on this argument, the paper deals with what may be described as the “metaphysics of guilt.” More generally, it is suggested, through a case study on the concept of guilt, that a moral theory avoiding naïve emotivism yet emphasizing the role of emotions in morality can and should pay attention to the transcendental status of emotions such as guilt—emotions constitutive of our concept of moral seriousness. Instead of psychologizing moral emotions, the paper employs Raimond Gaita's Wittgenstein‐inspired way of examining the place of the concepts of guilt and remorse in our ethical language‐use. Finally, some methodological remarks on the possibility of transcendental reflection in moral philosophy are presented. While it is not necessary to commit oneself to any specific religious tradition in order to emphasize the constitutive role of guilt in the way suggested in the paper, it turns out that the moral depth of this concept requires that one is at least open to religiously relevant ways of using moral language. In the fundamental metaphysical sense examined in the paper, guilt is a concept whose home language‐game is religious rather than secular ethics.     

Project DyAdd: Visual attention in adult dyslexia and ADHD

In this study of the project DyAdd, three aspects of visual attention were investigated in adults (18–55 years) with dyslexia (n = 35) or attention deficit/hyperactivity disorder (ADHD, n = 22), and in healthy controls (n = 35). Temporal characteristics of visual attention were assessed with Attentional Blink (AB), capacity of visual attention with Multiple Object Tracking (MOT), and spatial aspects of visual attention with Useful Field of View (UFOV) task. Results showed that adults with dyslexia had difficulties performing the AB and UFOV tasks, which were explained by an impaired ability to process dual targets, longer AB recovery time, and deficits in processing rapidly changing visual displays. The ADHD group did not have difficulties in any of the tasks. Further, performance in the visual attention tasks predicted variation in measures of phonological processing and reading when all of the participants were considered together. Thus, difficulties in tasks of visual attention were related to dyslexia and variation of visual attention had a role in the reading ability of the general population.