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.     

Defining Compulsive Behavior

Neuropsychology Review - Compulsive tendencies are a central feature of problematic human behavior and thereby are of great interest to the scientific and clinical community. However, no consensus...     

The medial temporal lobe and visual working memory: Comparisons across tasks, delays, and visual similarity

Whether the hippocampus and medial temporal lobe (MTL) play any important role in visual working memory is a relatively new and controversial research question. The primary goal of this study was to assess working memory for faces over very short delays in patients with MTL damage. Patients and matched controls were required to remember one face that was parametrically morphed to be more or less similar to a probe face, over either a 1- or an 8-sec delay. Memory was assessed using both forced choice and old-new recognition tasks. The results show that MTL damage impairs both speed and accuracy of visual working memory across tasks. We speculate that the hippocampus is generally necessary for memory encoding.     

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.