Effect of Mg content on Portevin–Le Chatelier band strain in Al–Mg sheet alloys

Experimental measurements of stress drops and band strains in type-B Portevin–Le Chatelier (PLC) bands were carried out for 5xxx series Al–Mg sheets with Mg content between 1.8 and 4.5?wt%. While the stress drops increase with global strain, the band strain values in all the samples follow a common linear relationship with global strain. The results indicate that the type-B PLC band strain is independent of solute content at given strain rate.     

Yielding and strain hardening in aluminium single-crystal foils subjected to tension and bending

A series of tensile and microbend tests were conducted on aluminium single-crystal foil specimens with different thicknesses ranging from 20 to 90?µm. Two different crystal orientations relative to the tensile direction were considered in the tests: one is an orientation that was excepted to activate at least four slip systems on four different slip planes, and the other is an orientation that was expected to activate only a single-slip system. In the tensile tests, typical size dependence of initial yield strength was observed. The microbend test method was extended to include a reversal of bending direction. Using the curves of bending moment normalized by the square of foil thickness versus surface strain, which were obtained from the reversed bending tests, the total amounts of strain hardening were divided into isotropic and kinematic hardening components. In the microbend tests, a pronounced size-dependent kinematic hardening behaviour was clearly observed; meanwhile, the amounts of isotropic hardening were very small, particularly for the single-slip orientation.     

Solutal gradients in strained equilibrium

Abstract

We demonstrate that the distortion of a crystal, caused by secondary phase precipitates, can stabilize a solutal gradient around the precipitate. The gradient persists in the quasi-static state stabilized by the gradient of the elastic energy around the precipitate. The peak concentration at the interface between precipitate and matrix hereby is independent of the radius of the precipitate and no mechanism of ripening is active in an arrangement of precipitates of different size. The model offers an explanation of experimental observations of the anomalous stability of nano-precipitates in Al–Cu.     

Written on the body: Deliberate self-harm as communication

The inability to manage distress would be problematic at any time; but it is especially problematic when distress is accompanied by (or made up of) feelings of rage, cruelty and self-hatred. I will argue here that people who self-harm are communicating rage and hostility to themselves and others in ways that often leave them frustrated and hopeless; and leave professional carers aghast. I will conclude with some ideas about psychological therapies that may help such people; drawing very much upon the work of colleagues in the forensic psychotherapy field: especially Anne Aiyegbusi (2004 Aiyegbusi, A. 2004. “Forensic mental health nursing: Care with security in mind”. In A matter of security: The application of attachment theory to forensic psychiatry and psychotherapy, Edited by: Pfafflin, F. and Adshead, G. 167–192. London: Jessica Kingsley.  [Google Scholar]), Anna Motz (2008 Motz, A. 2008. The psychology of female violence: Crimes against the body, 2nd edn, Hove: Brunner Routledge.  [Google Scholar], 2009 Motz, A. 2009. Managing self harm: Psychological perspectives, London: Routledge.  [Google Scholar]) and Estela Welldon (1992).     

The Return of the Native: Globalization and the Adaptive Responses of Transmigrants

The intent of this study is to examine the adaptive responses of Hong Kong transmigrants and their transnational and transcultural practices in terms of their consequent behavioral and emotional patterns. Their transnational practices and relative adaptability can be explained with Robert Merton's (1957) “strain theory.” More specifically, the study aims to identify, describe, and explain the variety of behavioral patterns and modes of emotional manifestations of adaptation of Hong Kong returnees, and to identify their individual and collective strategies of adaptation to help them solve their adjustment and integration problems in their adopted countries.     

The infant and the infinite: On psychoanalytic faith – Bion,Meltzer and Kierkegaard

This paper discusses the meaning of psychoanalytic faith as a useful developmental concept, which applies to the therapeutic process in the consulting room as to other intimate educational experiences. Faith is a concept which has been little considered in relation to psychoanalysis, partly owing to semantic confusion with ‘the Faith’ as in religious or psychoanalytic dogma, and partly owing to the difficulty of defining or describing what it is, outside accepted jargon. Yet, faith is traditionally the gateway to experiencing the unknown – a psychoanalytic goal-demanding negative capability. It is suggested that philosophy and poetry, where the concept is more familiar, can provide psychoanalytic parallels for this particular type of learning from experience. The viewpoints of Bion, Meltzer and Kierkegaard are taken as contributing to a picture of how, in the psychoanalytic session, there may be a developmental encounter between the infant (patient) and the infinite (the transference process, rather than the analyst as a person).     

The Failure to Contain: How Persecutory Anxieties Contribute to Noncompliance in Adult Patients with Congenital Chronic Pain Conditions

ABSTRACT

Patients with sickle-cell disease suffer from lifelong pain. Many prefer to receive emergent rather than managed health care, which results in these people being termed “noncompliant.” This paper explores the contributing factors of such noncompliance in the adult patient with painful chronic illness. In the earliest stages of development, internal pain is attributed to external origins, and the effects of this on the psyche are analogous to those of physical abuse. When the infant's pain cannot be contained, projective identification and persecutory anxieties become deeply ingrained. Interventions that focus on healing from trauma and building trust are preferable to those which most value immediate compliance, as the patterns of behavior are so firmly entrenched.     

Split Self Affairs and Their Treatment

SUMMARY

The Split Self Affair is a long-term serious relationship. The split being played out in the affair reflects an internal split between doing things “right” and the emotional self. Treatment for those involved centers on understanding the origins of the internal split and on reclaiming the neglected emotional self. Long term individual therapy is the treatment of choice, augmented by other modalities.     

Internal Forces During Static Prehension: Effects of Age and Grasp Configuration

The authors studied effects of healthy aging on 3 components of the internal force vector during static prehensile tasks. Young and older subjects held an instrumented handle using a 5-digit prismatic grasp under different digit configurations and external torques. Across digit configurations, older subjects showed larger internal normal (grip) and tangential (load-resisting) digit force components and larger internal moment of force. In contrast to earlier reports, safety margin values were not higher in the older subjects. The results show that the increased grip force in older persons is a specific example of a more general age-related problem reflected in the generation of large internal force vectors in prehensile tasks. It is possible that the higher internal forces increase the apparent stiffness of the hand+handle system and, hence, contribute to its stability. This strategy, however, may be maladaptive, energetically wasteful, and inefficient in ensuring safety of hand-held objects.