Magnetomechanical performance of directionally solidified Fe-Ga alloys

Iron-gallium alloys can produce magnetostrictions of ~400 ppm and might serve as mechanically robust actuator/sensing materials. However, for polycrystalline Fe-Ga alloys, the magnetostrictive performance decreases with the increasing deviations from the ideal <100> texture. In this paper, three directionally solidified Fe-Ga alloys with gallium contents of 17, 18.4, and 19.5 at. % were characterized at ambient temperature. These specimens exhibit high d33 and magnetic permeability when subjected to applied magnetic fields, indicating their suitability for light weight actuator applications but not for high force applications due to their low saturation magnetostriction and hence low blocking force. All the alloys produce significant changes in magnetization, around 0.7Ms-0.8Ms when subjected to cyclic compressive stresses of 51 MPa, making them promising candidate materials for sensing and energy harvesting applications. However, eddy current effects may easily become a problem when such materials are subjected to a high frequency vibration or magnetic field due to their intrinsic high magnetic permeability

Early evaluation of Unistats: user experiences

This paper sets out the findings of the user evaluation of Unistats.UK Higher Education Funding Bodie

Understanding how people choose to pursue taught postgraduate study

HEFC

Geological and engineering characteristics of some Kent brickearths

Imperial Users onl

The Deformation of Subglacial Till: A Numerical Model

Prior work has shown that ice streams in West Antarctica are probably underlain by a layer of till 6 to 12 m thick. This till layer may be similiar to mobile drift found by Kamb (1979) on Blue Glacier in Washington State and by Boulton (1979) at Breidamerjokull in Iceland. This paper presents a preliminary model for flow of this till layer. The till is assumed to be linearly viscous with a calculated viscosity of 3Xl0**8 Pa s. Flow is caused by shear stress from the ice above and by pressure differences. The thickness over time is tested by solving equations numerically using a time-centered finite-difference method. Results show that the till layer tends towards a constant thickness despite initial gradients in thickness.No embarg

Acculturative strategies and the outcomes of self-esteem and well-being of Latino immigrants to Boston

Acculturation is the negotiation process that immigrants undergo as they struggle to adapt to their new culture. Four acculturative strategies are thought to exist that immigrants can choose, and, although the selection of an acculturative strategy is influenced by the sociocultural context, the adoptions of different strategies have been associated with specific psychological outcomes (Berry, 1997, 2005; Neto, 2002; Sam, 2000). Past acculturative research has largely focused on areas outside of the United States; the current project is designed to fill a gap in the psychological literature by exploring Boston, Massachusetts, a city which has experienced a tremendous increase of Latino immigrants over the past decade