Guide to the Linfield College Photograph Collection

This collection contains photographs, glass lantern and plastic slides, and film negatives depicting the many-layered facets of life at Linfield College on its McMinnville and Portland campuses. The photography features (without limit to): students, faculty and staff, commencements, guest speakers and performers, buildings, activities and clubs, athletics, the arts (studio and performance), residence life, social, and study scenes

Corridors for LIFE; ecological network analysis Regione Emilia-Romagna - the plains of Provincia di Modena & Bologna

This report gives the result of an analysis of the ecological network, designed for the agricultural plains of the Provinces of Modena and and Bologna. Three ecosystem types were selected: woodland, wetland, and grassland. Species were selected which can be considered representative of these ecosystems. The LARCH model was used to assess whether these ecosystems still function as an ecological network. We found that the region has a serious fragmentation problem. After implementation of the ecological network the situation would improve much. Larger areas for nature rehabilitation would further improve the functioning of the ecological network

On the continuous spectral component of the Floquet operator for a periodically kicked quantum system

By a straightforward generalisation, we extend the work of Combescure from rank-1 to rank-N perturbations. The requirement for the Floquet operator to be pure point is established and compared to that in Combescure. The result matches that in McCaw. The method here is an alternative to that work. We show that if the condition for the Floquet operator to be pure point is relaxed, then in the case of the delta-kicked Harmonic oscillator, a singularly continuous component of the Floquet operator spectrum exists. We also provide an in depth discussion of the conjecture presented in Combescure of the case where the unperturbed Hamiltonian is more general. We link the physics conjecture directly to a number-theoretic conjecture of Vinogradov and show that a solution of Vinogradov's conjecture solves the physics conjecture. The result is extended to the rank-N case. The relationship between our work and the work of Bourget on the physics conjecture is discussed.Comment: 25 pages, published in Journal of Mathematical Physic