A one-dimensional lattice model for a quantum mechanical free particle

Two types of particles, A and B with their corresponding antiparticles, are defined in a one dimensional cyclic lattice with an odd number of sites. In each step of time evolution, each particle acts as a source for the polarization field of the other type of particle with nonlocal action but with an effect decreasing with the distance: A -->...\bar{B} B \bar{B} B \bar{B} ... ; B --> A \bar{A} A \bar{A} A ... . It is shown that the combined distribution of these particles obeys the time evolution of a free particle as given by quantum mechanics.Comment: 8 pages. Revte

Understanding recovery in the context of lived experience of personality disorders: a collaborative, qualitative research study

Background Concepts of recovery increasingly inform the development and delivery of mental health services internationally. In the UK recent policy advocates the application of recovery concepts to the treatment of personality disorders. However diagnosis and understanding of personality disorders remains contested, challenging any assumption that mainstream recovery thinking can be directly translated into personality disorders services. Methods In a qualitative interview-based study understandings of recovery were explored in extended, in-depth interviews with six people purposively sampled from a specialist personality disorders’ service in the UK. An interpretive, collaborative approach to research was adopted in which university-, clinical- and service user (consumer) researchers were jointly involved in carrying out interviews and analysing interview data. Results Findings suggested that recovery cannot be conceptualised separately from an understanding of the lived experience of personality disorders. This experience was characterised by a complexity of ambiguous, interrelating and conflicting feelings, thoughts and actions as individuals tried to cope with tensions between internally and externally experienced worlds. Our analysis was suggestive of a process of recovering or, for some, discovering a sense of self that can safely coexist in both worlds. Conclusions We conclude that key facilitators of recovery – positive personal relationships and wider social interaction – are also where the core vulnerabilities of individuals with lived experience of personaility disorders can lie. There is a role for personality disorders services in providing a safe space in which to develop positive relationships. Through discursive practice within the research team understandings of recovery were co-produced that responded to the lived experience of personality disorders and were of applied relevance to practitioners

Screening for depression and anxiety after stroke : developing protocols for use in the community

Purpose: To develop screening protocols to detect depression and anxiety after stroke in a community setting and train therapists to administer them. Method: Psychologists and a community therapist met to design a system suitable for screening for anxiety and depression in all those with stroke, including people with cognitive and/or communication problems. Other therapists and a local user group were also consulted. Therapists were then trained in the use of the protocols. The ability to enact the protocols was assessed via case vignettes and staff experience, over a month-long trial. Results: It was considered appropriate for community therapists to screen patients and to do this within 4 weeks of first contact. Two protocols were designed, one for patients without significant communication/cognitive deficits and one for patients with these difficulties. Therapists applied the protocols with accuracy to the case vignettes and rated the training highly. No challenges in applying the protocols in the clinical setting were reported over an initial 1-month trial. Conclusion: Two protocols to screen for depression and anxiety after stroke have been developed. These appear feasible for use when trialled via case vignette and in clinical practice. Further research might consider the usefulness of the screens in detecting actual clinical disorder and developing better screens to identify anxiety after stroke, particularly in those with a cognitive and/or communication disorder. Implications for Rehabilitation Depression and anxiety are common after stroke and likely affect rehabilitation outcomes. These problems can be identified via screening protocols that include measures appropriate for use with those patients having significant cognitive and/or communication disabilities. Rehabilitation therapists can enact these protocols

Untersuchungen zur Molekulardynamik, Struktur und Umwandlungserscheinungen in Homopolymeren und Copolymeren mit Hilfe von Streuexperimenten und ergaenzenden Methoden Schlussbericht

SIGLEAvailable from TIB Hannover: DtF QN1(37,10) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Indication for hyperdeformed cluster states in

An activation technique was used to investigate relative yields of fission products from the reaction 232Th(n, f ) for neutron energies between 1.3 and 1.8MeV covering the region around the first hyperdeformed resonances. Intensities of characteristic γ-ray transitions were analyzed to search for changes in the mass distribution for neutron energies corresponding to the resonances and below the resonances. Relative increases in yield between 7 and 23% are observed for A ≈ 100 and 132 in the resonance region around 1.6MeV. It is proposed that the yield enhancement of daughter nuclei of the preformed fragments 132Sn and 101Zr arises from cold fission of a di-cluster configuration. The experimental results support theoretical predictions for the existence of hyperdeformed octupole shapes based on the di-nuclear configuration 132Sn + 101Zr