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32 results on '"Charles D. Duncan"'

1. Subject Index

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

3. Bird Species Index

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

4. Works Cited

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

6. Acknowledgments

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

8. Species Accounts

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

9. 5 Introduction to Species Accounts

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

10. 3 Maine's Ornithological History

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

14. 1 Introduction

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

15. Foreword

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

17. Title Page, Copyright Page

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

18. Contents

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Published
2020

21. Birds of Maine

Author

Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, Barbara Vickery, Peter D. Vickery, Charles D. Duncan, Jeffrey V. Wells, William J. Sheehan, Scott Weidensaul, and Barbara Vickery

Subjects
Birds--Maine
Abstract

A comprehensive and beautifully illustrated overview to the birds of Maine The first comprehensive overview of Maine's incredibly rich birdlife in more than seven decades, Birds of Maine is a detailed account of all 464 species recorded in the Pine Tree State. It is also a thoroughly researched, accessible portrait of a region undergoing rapid changes, with southern birds pushing north, northern birds expanding south, and once-absent natives like Atlantic Puffins brought back by innovative conservation techniques pioneered in Maine.Written by the late Peter Vickery in cooperation with a team of leading ornithologists, this guide offers a detailed look at the state's dynamic avifauna—from the Wild Turkey to the Arctic Tern—with information on migration patterns and timing, current status and changes in bird abundance and distribution, and how Maine's geography and shifting climate mold its birdlife. It delves into the conservation status for Maine's birds, as well as the state's unusually textured ornithological history, involving such famous names as John James Audubon and Theodore Roosevelt, and home-grown experts like Cordelia Stanwood and Ralph Palmer. Sidebars explore diverse topics, including the Old Sow whirlpool that draws multitudes of seabirds and the famed Monhegan Island, a mecca for migrant birds.Gorgeously illustrated with watercolors by Lars Jonsson and scores of line drawings by Barry Van Dusen, Birds of Maine is a remarkable guide that birders will rely on for decades to come.Copublished with the Nuttall Ornithological Club

Published
2020

22. A ranking of diylophilic reactivities of olefins toward the singlet and triplet forms of the trimethylenemethane biradical, 2-isopropylidenecyclopenta-1,3-diyl

Author

Jerome A. Berson, Leonard R. Corwin, Charles D. Duncan, and James Davis

Subjects
chemistry.chemical_compound, Colloid and Surface Chemistry, chemistry, Computational chemistry, Trimethylenemethane, General Chemistry, Singlet state, Biochemistry, Catalysis, Ranking (information retrieval)
Published
1980
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23. Group theory and reaction mechanisms: Permutation theoretic prediction and computational support for pseudorotation modes in C2H5+ and C5H5+ rearrangements

Author

Thomas D. Bouman, Charles D. Duncan, and Carl Trindle

Subjects
Physics, Computation, Degenerate energy levels, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Symmetry (physics), Transition state, CNDO/2, Permutation, Computational chemistry, Pseudorotation, Statistical physics, Physical and Theoretical Chemistry, Group theory
Abstract

The McIver–Stanton rules concerning the symmetry of transition states have a counterpart in rules concerning the permutation symmetry of single steps in degenerate rearrangements, derivable with the aid of Longuet–Higgins group theory. The generalized rules are illustrated by the widely studied PX5 polytopal rearrangements. The analysis leads to prediction of hitherto unexplored “pseudorotation” pathways for rearrangements in ethyl and homotetrahedryl cations. CNDO computations of system energies, gradients, and curvatures at critical points on the C2H and C5H surfaces indicate that symmetry-breaking in keeping with the permutation-theoretic predictions is a key feature of the low-energy rearrangements of these systems. In particular, computation indicates that the C2v “classical” homotetrahedral cation corresponds to an energy maximum rather than an energy minimum, or a transition state.

Published
1977
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24. Mechanistic characterization of the intermediates in the thermal and photochemical deazetation of two isomeric methylenepyrazolines, 7-isopropylidene-2,3-diazabicyclo[2.2.1]hept-2-ene and 2,2-dimethyl-3,4-diazabicyclo[3.3.0]octa-3,8-diene. An aproach to the generation and capture of protoplanar and protobisected trimethylene methanes

Author

Jerome A. Berson, Charles D. Duncan, and Dorothy Cichra

Subjects
chemistry.chemical_compound, Colloid and Surface Chemistry, Diene, chemistry, Organic chemistry, General Chemistry, Photochemistry, Biochemistry, Catalysis, Ene reaction, Characterization (materials science)
Published
1980
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26. Rates of spin-forbidden organic reactions. Theoretical study of the rate of direct production of triplet methylene by dissociation of singlet diazomethane

Author

Carl Trindle, Charles D. Duncan, H. Önder Pamuk, and Sambhu N. Datta

Subjects
chemistry.chemical_compound, Direct production, chemistry, Organic reaction, Diazomethane, General Engineering, Singlet state, Physical and Theoretical Chemistry, Methylene, Photochemistry, Dissociation (chemistry)
Published
1977
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29. Kinetic confirmation and synthetic circumvention of the cascade mechanism for population of the triplet ground state of a trimethylenemethane

Author

Charles D. Duncan, Genevieve C. O'Connell, Jerome A. Berson, and Matthew S. Platz

Subjects
education.field_of_study, Chemistry, Population, Trimethylenemethane, General Chemistry, Kinetic energy, Biochemistry, Catalysis, chemistry.chemical_compound, Colloid and Surface Chemistry, Cascade, Computational chemistry, education, Ground state, Mechanism (sociology)
Published
1976
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