TEM in situ straining experiments in Fe at low temperature

In situ transmission electron microscopy straining experiments were carried out in pure Fe to investigate the origin of the discontinuity observed at 250 K in the temperature variation of the deformation activation parameters. The results show that the motion of screw dislocations is steady at 300 K, in agreement with a kink-pair mechanism, but jerky at 110 K. This change has been attributed to a transition from a kink-pair mechanism to a locking–unlocking mechanism, similar to that observed previously in Ti.     

Deformation twins induced by multi-mode deformation in nanocrystalline copper

A multi-mode deformation model is used in a molecular dynamics simulation of nanocrystalline copper. Abundant deformation twin lamellae are developed by shearing the following compression to the elastic limit. Deformation twins (DTs) nucleate through two different mechanisms facilitated by Shockley partial slips. Interactions between DTs and Shockley partials are observed in this simulation.     

Molecular dynamics simulations of the size effect of titanium single-crystal nanopillars orientated for double prismatic slips

An inverse “smaller is stronger” trend is predicted on the basis of molecular dynamics simulations of α-titanium (Ti) single-crystal nanopillars orientated for double prismatic slips when the nanopillars are less than 7?nm wide. This trend is attributed to a significant increase in the surface energy due to the nucleation and propagation of edge dislocations on the surface of the pillars.     

Chaos,creativity, and counseling: Aspects of a Transtheoretical model of the counseling process

Counselors ask their clients to become creative in their personal lives and within their counseling process. The process of counseling is a creative process. Growth is necessary for effective improvement in the counseling process. This paper will examine creativity from the point of view of the affective experience of the creator, and the relationship of this experience to the client in counseling.

The position here is that the process of counseling is both a creative process and one that involves tensions and turbulence. Based on a model of nonlinear dynamics, and ideas about the creative process, this study draws a dynamical fractal movie of the counseling process in which the counselor serves as an attractor for the construction of opposites in the client behavior that allow for growth and the construction of a new state of psychosocial events.     

Facilitating the highly bonded cohort: Should more be done to anticipate and reduce the potential for hyper-cohesiveness and deindividuation in therapy training cohorts in universities?

Successfully facilitating learning for small therapy training programmes requires a special understanding of the psychological work of group processes. Students in therapy training spend almost every class together over two or more years. In these student groups, or cohorts, individuals manage themselves within a unique interpersonal and intragroup dynamic. Course instructors must develop their capacity to work effectively with this specific learning milieu. At the same time, the particular dynamics of the cohort context might not be understood by university management where increasingly few cohort contexts exist for students. Consequently, phenomena arising from the specialised nature of the group environment may not be well understood outside of the expertise of the course. In the first part of the paper, the international literature about learning in cohorts is reviewed. In the second part, this reflection is further developed to explore facilitation of a group that has some features of what might be described as negative cohesiveness, or what is described in family theory as enmeshment. Some consideration as to how to anticipate and off-set potential difficulties for groups in therapy training courses is also contributed.     

Experiences of young adult women with emotionally absent fathers

This study explored the experiences of young adult women (n = 11) who grew up with emotionally absent fathers. The women (White: Afrikaans) were between the ages of 20 and 31 (5 were married, 1 was engaged, 1 was in a relationship, and 4 were single). The participants completed in-depth interviews regarding their retrospective perceptions of emotionally absent father experiences and the related effects on them. Data were thematically analyzed. Findings indicated that the participants experienced difficulty in sharing emotions with their fathers and fathers did not show affection or express their love. The participants perceived their fathers to have shown no interest, approval or acknowledgement of them, and viewed them as untrustworthy. They also believed that relationship qualities with their fathers influenced how they related to men in general. Father emotional absence negatively impacts on daughter's emotional well-being.     

The Persistence Of Psychological Refractoriness

The view that psychological refractoriness is a fundamental characteristic of human performance was supported by its survival of a determined attempt to eliminate it through training. An S was given practice for 87 days on a successive choice-response task with a constant inter-signal interval of 100 msec. Although his performance became better than any exhibited by Ss with more typical practice, he was not able to reduce psychological refractoriness to less than 20 or 25 msec. Moreover, when S was then shifted to variable inter-signal intervals he showed greater than the usual amount of psychological refractoriness at the intervals next longer than 100 msec. This indicated that he had learned a special skill rather than a generally “less refractory” mode of response (or merely better technique on the separate tasks). Training was found to be an effective way of eliminating holding back on the first response.     

Coordination Dynamics of the Horse-Rider System

The authors studied the interaction between rider and horse by measuring their ensemble motions in a trot sequence, comparing 1 expert and 1 novice rider. Whereas the novice's movements displayed transient departures from phase synchrony, the expert's motions were continuously phase-matched with those of the horse. The tight ensemble synchrony between the expert and the horse was accompanied by an increase in the temporal regularity of the oscillations of the trunk of the horse. Observed differences between expert and novice riders indicated that phase synchronization is by no means perfect but requires extended practice. Points of contact between horse and rider may haptically convey effective communication between them.     

Mathematical Models of Central Pattern Generators in Locomotion

Possible neural connective patterns and functions with respect to interlimb coordination are studied theoretically with a mathematical model of the central pattern generating system for cat locomotion. Activities in populations of neurons controlling limb joint flexors and extensors in all four limbs are represented by a system of nonlinear differential equations. Solutions of the system for various parameter values simulate various gaits of the cat. The model is shown to be capable of generating all gaits of the cat and accounting for corresponding phase changes in interlimb coordination. The model also exhibits smooth changes of gait, and smooth initiation and termination of stepping. Further, within each limb, muscle sequencing, step cycle phases, and flexor-extensor interactions can be studied. The model suggests that one of the simplest mechanisms for a central command system to change the gait is via inhibition of specific interlimb propriospinal pathways. In a final section, properties of both proposed single limb and interlimb models are reviewed with specific reference to planning future experimental and theoretical studies.