Crossover from bulk to surface diffusion in the fluctuations of step edges on Pt(111)

Using low-energy electron microscopy we explore the fluctuations of step edges on Pt(111) in the temperature range 1190?K<T<1520?K. Below 1400?K the relaxation times vary with wave vector q as q ³, and above 1400?K as q ², while the observed activation energy changes from 1.25 to 2.75?eV. A discussion shows that surface diffusion is responsible for the rates at low temperatures, and that bulk vacancy diffusion becomes dominant above 1400?K. We infer that a similar crossover must occur for steps on most metal surfaces. The step stiffness is determined as 175 ± 20?meV?nm^?1 at 1500?K.     

Psychoanalytic aspects of inpatient treatment

This paper looks at the experience of inpatient hospital treatment at the Cassel Hospital and how formal psychoanalytic psychotherapy, with its emphasis on the transference and the inner world, fits into that context and orientates itself to some of the realities of the setting. It outlines how psychotherapy and nursing can work to inform and enrich each other, and what is psychoanalytic about the overall work. A bridge of understanding is built using the patients' perceptions of, adjustment to and conflict about the inpatient setting, and the affective impact of the processes on patients and staff alike. Two clinical examples of severe child abuse family cases are given, the first of Munchhausen syndrome by proxy, the second in which a baby sibling had been killed. They show how in-depth psychoanalytic work with mother and child and individual psychotherapy of the child can be combined with psychotherapy of the parents and intensive work in the therapeutic community. Such a combination can contribute, even in cases of severe pathology, to the development of the relationship between mother and child and promote successful rehabilitation in the outside community.