SQUID developments for the gravitational wave antenna MiniGRAIL

We designed two different sensor SQUIDs for the readout of the resonant mass gravitational wave detector MiniGRAIL. Both designs have integrated input inductors in the order of 1.5 muH and are planned for operation in the mK temperature range. Cooling fins were added to the shunt resistors. The fabricated SQUIDs show a behavior that differs from standard DC-SQUIDs. We were able to operate a design with a parallel configuration of washers at reasonable sensitivities. The flux noise saturated to a value of 0.84 muPhi0/radicHz below a temperature of 200 mK. The equivalent noise referred to the current through the input coil is 155 fA/radicHz and the energy resolution yields 62 h

Vortex Trapping an Expulsion in Thin-Film Type-II Supercondu cting Strips

Vortex trapping is investigated in thin-film strips of superconducting material. We present a model for the critical field above which vortex trapping occurs in these strips. This model includes the pairing energy of vortex-antivortex pairs in addition to the energy of single vortices. Experimental verification of the model with a scanning SQUID microscope shows very good agreement between the model and experiments on YBa2Cu3O7-delta and Nb strips. Statistical analysis of the vortex distribution in the strips above the critical field has been performed and a comparison has been made between Nb and YBa2Cu3O7-delta for the distributions in the lateral and longitudinal directions

Constructs of relationships and issues of authority in nursing

The research on which this paper is based was designed to investigate nurses' perceptions of relationships in their work. The most important issue to emerge from their descriptions of relationships was that of the nature of authority. From their own accounts; examples of which are included in this paper; it can be seen that views of authority in the hospital setting are both complex and varied. We have identified four different types of authority as seen by nurses: parental, reciprocal, political and arbitrary. Our research suggests that any analysis of authority relationships based purely on structural arrangements would be too simplistic. One possible implication of the findings we present might be that more explicit discussion of the nature of authority in nursing relationships should be encouraged both in training and subsequently