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Miniature of Winslows: Pilgrims, Patrons, and Portraits
Winslows: Pilgrims, Patrons, and Portraits

Date: 1974-01-01

Access: Open access

Catalogue from a joint exhibition at Bowdoin College Museum of Art and the Museum of Fine Arts, Boston. Includes biographical references.
Miniature of pp-wave limits and orientifolds
pp-wave limits and orientifolds

Date: 2003-02-03

Creator: Stephen G. Naculich, Howard J. Schnitzer, Niclas Wyllard

Access: Open access

We study the pp-wave limits of various elliptic models with orientifold planes and D7-branes, as well as the pp-wave limit of an orientifold of AdS5 × T11. Many of the limits contain both open and closed strings. We also present pp-wave limits of theories which give rise to a compact null direction and contain open strings. Maps between the string theory states and gauge theory operators are proposed. © 2002 Elsevier Science B.V. All rights reserved.
Miniature of All Maine Biennial '79
All Maine Biennial '79

Date: 1979-01-01

Access: Open access

"Exhibition dates: July 27-September 16, 1979." "Supported by the Maine State Commission on the Arts and the Humanities."
Miniature of Plasma membrane-cell wall contacts
Plasma membrane-cell wall contacts

Date: 2000-01-01

Creator: B. D. Kohorn

Access: Open access

Miniature of Replacement of histidines of light harvesting chlorophyll a/b binding protein II disrupts chlorophyll-Protein complex assembly
Replacement of histidines of light harvesting chlorophyll a/b binding protein II disrupts chlorophyll-Protein complex assembly

Date: 1990-01-01

Creator: Bruce D. Kohorn

Access: Open access

Eukaryotic light harvesting proteins (LHCPs) bind pigments and assemble into complexes (LHCs) that channel light energy into photosynthetic reaction centers. The structures of several prokaryotic LHCPs are known and histidines are important for the binding of the associated pigments. It has been difficult to predict how the eukaryotic LHCPs associate with pigments as the structure of the major LHCP of photosystem II is not yet known. While each LHCPII binds approximately 13 chlorophylls the protein contains only three histidines, one in each putative transmembrane helix. Experiments that use isolated pea (Pisum sativum L.) chloroplasts and mutant LHCPII synthesized in vitro show that the substitution of either an alanine or an arginine for each histidine residue inhibits some aspect of LHCII assembly. The histidine of the first membrane helix, but not the second or third, may be involved in the transport across the chloroplast envelope. No histidine alone is essential for the insertion of LHCP into thylakoid membranes, yet arginine substitutions are more inhibitory than those of alanine. The histidine replacements have their most pronounced effect on the assembly of LHCP into LHCII.
Miniature of Calculating the Local Biotic Exchange Ratio of O<sub>2</sub> and CO<sub>2</sub> at Harvard Forest: Using Flux Measurements to Improve Past Estimates
Calculating the Local Biotic Exchange Ratio of O2 and CO2 at Harvard Forest: Using Flux Measurements to Improve Past Estimates
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  • Restriction End Date: 2025-06-01

    Date: 2020-01-01

    Creator: Diana Katalina Grandas

    Access: Access restricted to the Bowdoin Community

      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.

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