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Bowdoin Orient, v. 36, no. 9

Date: 1906-06-15

Access: Open access

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Bowdoin Orient, v. 37, no. 17

Date: 1907-11-22

Access: Open access

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Bowdoin Orient, v. 39, no. 20

Date: 1909-12-10

Access: Open access

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Bowdoin Orient, v. 40, no. 5

Date: 1910-05-06

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Bowdoin Alumnus Volume 41 (1966-1967)

Date: 1967-01-01

Access: Open access



Bowdoin College Catalogue (1913-1914)

Date: 1914-01-01

Access: Open access

Bowdoin College Bulletin no. 50


Miniature of Application of the Landau-Zener Model and Fermi's Golden Rule to Estimate Triplet Quantum Yield for Organic Molecules
Application of the Landau-Zener Model and Fermi's Golden Rule to Estimate Triplet Quantum Yield for Organic Molecules
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      Date: 2014-05-01

      Creator: Nathan D Ricke

      Access: Access restricted to the Bowdoin Community



        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.


        Nontranscribed spacer sequences promote in vitro transcription of Drosophila ribosomal DNA

        Date: 1982-11-11

        Creator: Bruce D. Kohorn, Peter M.m. Rae

        Access: Open access

        Tandem repeats of ribosomal RNA transcription units in Drosophila melanogaster are separated by a nontranscribed spacer that is comprised in part of serial repeats of a 0.24 kb sequence. DNA sequence analysis shows that such repeats are imperfect copies of a region that includes the site of in vivo rRNA transcription initiation (ca. -240 to +30). Subclones of the rDNA spacer that are copies of the sequence extending from -34 through the initiation site support detectable in vitro transcription in a mixture involving a Drosophila cell-free extract, but accurate in vitro transcription is considerably enhanced when a nontranscribed spacer template includes a copy of the sequence extending upstream of -34. From a comparison of the sequence and transcription template-effectiveness of various rDNA subclones, we infer that a major promoter of RNA polymerase I activity lies between -150 and -30 in the rDNA nontranscribed spacer. The nontranscribed spacer copies of the initiation region are less effective templates for transcription than is the region of in vivo initiation and there are differences between spacer repeates and the authentic sequence downstream of -240 that may account for this. © 1982 IRL Press Limited.


        Report of the President, Bowdoin College 1948-1949

        Date: 1949-01-01

        Access: Open access