The Cowl - v.66 - n.27 - May 2, 2002

The Cowl - student newspaper of Providence College. Vol 66 - No. 27 - May 2, 2002. 36 pages

Daring to Lead 2006

Presents findings from a survey that examines why nonprofit executives leave their jobs. Offers recommendations for strengthening and supporting current leadership, creating more diversity, and developing the next generation of nonprofit leaders

The Cowl - v.67 - n.3 - Sept 12, 2002

The Cowl - student newspaper of Providence College. Vol 67 - No. 3 - September 12, 2002. 28 pages

From Seed to Impact: Building the Foundations for a High-Impact Social Entrepreneurship Ecosystem

In this paper GSEN has collaborated with its global network of intermediary organisations to conduct one of the first dedicated investigations into support for early-stage social entrepreneurs. It draws on the data and experiences of 33 GSEN members to uncover the methodologies they use, as well as the opportunities and benefits of joining forces within a network

The Crescent Student Newspaper, January 23, 2004

Student newspaper of George Fox University.https://digitalcommons.georgefox.edu/the_crescent/2267/thumbnail.jp

Floquet generation of Majorana end modes and topological invariants

We show how Majorana end modes can be generated in a one-dimensional system by varying some of the parameters in the Hamiltonian periodically in time. The specific model we consider is a chain containing spinless electrons with a nearest-neighbor hopping amplitude, a p-wave superconducting term and a chemical potential; this is equivalent to a spin-1/2 chain with anisotropic XY couplings between nearest neighbors and a magnetic field applied in the z-direction. We show that varying the chemical potential (or magnetic field) periodically in time can produce Majorana modes at the ends of a long chain. We discuss two kinds of periodic driving, periodic delta-function kicks and a simple harmonic variation with time. We discuss some distinctive features of the end modes such as the inverse participation ratio of their wave functions and their Floquet eigenvalues which are always equal to +/- 1 for time-reversal symmetric systems. For the case of periodic delta-function kicks, we use the effective Hamiltonian of a system with periodic boundary conditions to define two topological invariants. The first invariant is a well-known winding number while the second invariant has not appeared in the literature before. The second invariant is more powerful in that it always correctly predicts the numbers of end modes with Floquet eigenvalues equal to +1 and -1, while the first invariant does not. We find that the number of end modes can become very large as the driving frequency decreases. We show that periodic delta-function kicks in the hopping and superconducting terms can also produce end modes. Finally, we study the effect of electron-phonon interactions (which are relevant at finite temperatures) and a random noise in the chemical potential on the Majorana modes.Comment: 15 pages, 11 figures; added more numerical and analytical results about second topological invariant, and a discussion of effects of electron-phonon interactions and noise on Majorana end mode

The Cowl - v.81 - n.13 - Jan 19, 2017

The Cowl - student newspaper of Providence College. Volume 81, Number 13 - January 19, 2017. 28 pages

The Cowl - v.58 - n.7 - Oct 28, 1993

The Cowl - student newspaper of Providence College. Volume 58, Number 7 - October 28, 1993. 24 pages

The Crescent Student Newspaper, September 16, 1994

Student newspaper of George Fox College (later George Fox University). 8 pages, black and white.https://digitalcommons.georgefox.edu/the_crescent/2115/thumbnail.jp