Passive force balancing of an active magnetic regenerative liquefier

Active magnetic regenerators (AMR) have the potential for high efficiency cryogen liquefaction. One active magnetic regenerative liquefier (AMRL) configuration consists of dual magnetocaloric regenerators that reciprocate in a persistent-mode superconducting solenoid. Issues with this configuration are the spatial and temporal magnetization gradients that induce large magnetic forces and winding currents. To solve the coupled problem, we present a force minimization approach using passive magnetic material to balance a dual-regenerator AMR. A magnetostatic model is developed and simulated force waveforms are compared with experimental measurements. A genetic algorithm identifies force-minimizing passive structures with virtually ideal balancing characteristics. Implementation details are investigated which affirm the potential of the proposed methodology

Passive force balancing of an active magnetic regenerative liquefier

Active magnetic regenerators (AMR) have the potential for high efficiency cryogen liquefaction. One active magnetic regenerative liquefier (AMRL) configuration consists of dual magnetocaloric regenerators that reciprocate in a persistent-mode superconducting solenoid. Issues with this configuration are the spatial and temporal magnetization gradients that induce large magnetic forces and winding currents. To solve the coupled problem, we present a force minimization approach using passive magnetic material to balance a dual-regenerator AMR. A magnetostatic model is developed and simulated force waveforms are compared with experimental measurements. A genetic algorithm identifies force-minimizing passive structures with virtually ideal balancing characteristics. Implementation details are investigated which affirm the potential of the proposed methodology.</p

Improvements in psychologists’ metacommunication self‐efficacy, willingness, and skill following online training and a supervision exercise

2019 Wiley Periodicals, Inc. Objective(s): Psychologists\u27 experiences of an online training tool in metacommunication as well as an in-supervisory metacommunication exercise were examined. Method: A total of 101 participants completed a training tool in metacommunication and changes in self-efficacy (SE) to use metacommunication with clients, the proportion of metacommunication used in vignette-responses, and their willingness to use metacommunication in supervision were assessed pre- and posttraining and at 6-week follow-up. A total of 48 participants elected to undertake the in-supervision exercise. Results: Participants reported significantly higher willingness and self-efficacy after completing the online training. They also showed a higher proportion of metacommunicative statements in their posttraining vignette responses compared with pretraining. The increase in willingness was retained at 6-week follow-up. There was an increase in self-efficacy from pre- to postonline-training, and this increased at follow-up. Conclusions: This opens the door to better developing metacommunication skills in supervisees through both online training and the metacommunication supervisory exercise. Areas for continued research are outlined