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Miniature of Breathers and other time-periodic solutions in an array of cantilevers decorated with magnetsy
Breathers and other time-periodic solutions in an array of cantilevers decorated with magnetsy

Date: 2019-01-01

Creator: Christopher Chong, Andre Foehr, Efstathios G. Charalampidis, Panayotis G. Kevrekidis, Chiara, Daraio

Access: Open access

In this article, the existence, stability and bifurcation structure of time-periodic solutions (including ones that also have the property of spatial localization, i.e., breathers) are studied in an array of cantilevers that have magnetic tips. The repelling magnetic tips are responsible for the intersite nonlinearity of the system, whereas the cantilevers are responsible for the onsite (potentially nonlinear) force. The relevant model is of the mixed Fermi-Pasta-Ulam-Tsingou and Klein-Gordon type with both damping and driving. In the case of base excitation, we provide experimental results to validate the model. In particular, we identify regions of bistability in the model and in the experiment, which agree with minimal tuning of the system parameters. We carry out additional numerical explorations in order to contrast the base excitation problem with the boundary excitation problem and the problem with a single mass defect. We find that the base excitation problem is more stable than the boundary excitation problem and that breathers are possible in the defect system. The effect of an onsite nonlinearity is also considered, where it is shown that bistability is possible for both softening and hardening cubic nonlinearities.
Miniature of Democracy Promotion in U.S. Counterinsurgency: Tracing Post-War Security Sector Reconstruction in El Salvador and Iraq
Democracy Promotion in U.S. Counterinsurgency: Tracing Post-War Security Sector Reconstruction in El Salvador and Iraq

Date: 2020-01-01

Creator: Emma Redington Lawry

Access: Open access

Throughout the 21st century, certain facets of the democratic peace theory have informed American foreign policy, as policymakers credit democracy promotion with long-term stability and peace. In contrast, many political scientists have documented the often destabilizing and violent effects of democratization, particularly in underdeveloped states. How can we reconcile these tensions, and in what ways do they affect American foreign policy abroad? Under the lens of just war theory, or the doctrine of military ethics detailing the conditions under which it is morally acceptable to go to war, wage war and restore peace after war, this paper seeks to examine security sector reconstruction in post-counterinsurgency eras. In doing so, my analysis documents the effects of electoral processes on security and underscores the many difficulties of post-war rebuilding processes. In understanding these difficulties, I attempt to extract crucial lessons from the “best case” scenario of El Salvador and the “worst case” scenario of Iraq, both of which illuminate the fundamental tension between democratization and stability.
Miniature of Bowdoin College Catalogue (1907-1908)
Bowdoin College Catalogue (1907-1908)

Date: 1908-01-01

Access: Open access

Bowdoin College Bulletin no. 14
Miniature of Bounding right-arm rotation distances
Bounding right-arm rotation distances

Date: 2007-03-01

Creator: Sean Cleary, Jennifer Taback

Access: Open access

Rotation distance measures the difference in shape between binary trees of the same size by counting the minimum number of rotations needed to transform one tree to the other. We describe several types of rotation distance where restrictions are put on the locations where rotations are permitted, and provide upper bounds on distances between trees with a fixed number of nodes with respect to several families of these restrictions. These bounds are sharp in a certain asymptotic sense and are obtained by relating each restricted rotation distance to the word length of elements of Thompson's group F with respect to different generating sets, including both finite and infinite generating sets. © World Scientific Publishing Company.
Miniature of A Gift Of Knowing: The Art Of Dorothea Rockburne
A Gift Of Knowing: The Art Of Dorothea Rockburne

Date: 2015-01-01

Access: Open access

Published for the exhibition A Gift of Knowing: The Art of Dorothea Rockburne at the Bowdoin College Museum of Art from March 14 through April 26, 2015, supported by the Elizabeth B. G. Hamlin Fund and the Shapell Family Art Fund. Design by Wilcox Design, Cambridge, Massachusetts Copyright© 2015 Bowdoin College
Miniature of Report of the President, Bowdoin College 1954-1955
Report of the President, Bowdoin College 1954-1955

Date: 1955-01-01

Access: Open access

Miniature of Bowdoin College Catalogue (1919-1920)
Bowdoin College Catalogue (1919-1920)

Date: 1920-01-01

Access: Open access

Bowdoin College Bulletin no. 98
Miniature of Directed interactions during episodic memory
Directed interactions during episodic memory
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  • Restriction End Date: 2025-06-01

    Date: 2020-01-01

    Creator: Rhianna J Patel

    Access: Access restricted to the Bowdoin Community

      Miniature of Simplified insertion of transgenes onto balancer chromosomes via recombinase-mediated cassette exchange
      Simplified insertion of transgenes onto balancer chromosomes via recombinase-mediated cassette exchange

      Date: 2012-05-01

      Creator: Florence F. Sun, Justine E. Johnson, Martin P. Zeidler, Jack R. Bateman

      Access: Open access

      Balancer chromosomes are critical tools for Drosophila genetics. Many useful transgenes are inserted onto balancers using a random and inefficient process. Here we describe balancer chromosomes that can be directly targeted with transgenes of interest via recombinase-mediated cassette exchange (RMCE). ©2012 Sun et al.
      Miniature of An Ode to the Birth Justice Movement Birthing, Battling, Being: Black
      An Ode to the Birth Justice Movement Birthing, Battling, Being: Black
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          Date: 2020-01-01

          Creator: Eskedar Girmash

          Access: Access restricted to the Bowdoin Community

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