Per Bak Jensen's Books

How Nature Works

the science of self-organized criticality

By: Per Bak

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How Nature Works

the science of self-organized criticality

By: Per Bak

Self-organized criticality, the spontaneous development of systems to a critical state, is the first general theory of complex systems with a firm mathematical basis. This theory describes how many seemingly desperate aspects of the world, from stock market crashes to mass extinctions, avalanches to solar flares, all share a set of simple, easily described properties. "...a'must read'...Bak writes with such ease and lucidity, and his ideas are so intriguing...essential reading for those interested in complex systems...it will reward a sufficiently skeptical reader." -NATURE "...presents the theory (self-organized criticality) in a form easily absorbed by the non-mathematically inclined reader." -BOSTON BOOK REVIEW "I picture Bak as a kind of scientific musketeer; flamboyant, touchy, full of swagger and ready to join every fray... His book is written with panache. The style is brisk, the content stimulating. I recommend it as a bracing experience." -NEW SCIENTIST

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Page Count

229

Publisher

Springer Science & Business Media

Published Date

ISBN 10

1475754264

ISBN 13

9781475754261

Molecular Symmetry and Spectroscopy

By: Philip R. Bunker,Per Jensen

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Molecular Symmetry and Spectroscopy

By: Philip R. Bunker,Per Jensen

The first edition, by P.R. Bunker, published in 1979, remains the sole textbook that explains the use of the molecular symmetry group in understanding high resolution molecular spectra. Since 1979 there has been considerable progress in the field and a second edition is required; the original author has been joined in its writing by Per Jensen. The Material of the first edition has been reorganized and much has been added. The molecular symmetry group is now introduced early on, and the explanation of how to determine nuclear spin statistical weights has been consolidated in one chapter, after groups, symmetry groups, character tables and the Hamiltonian have been introduced. A description of the symmetry in the three-dimensional rotation group K(spatial), irreducible spherical tensor operators, and vector coupling coefficients is now included. The chapters on energy levels and selection rules contain a great deal of material that was not in the first edition (much of it was undiscovered in 1979), concerning the Jahn-Teller effect, the Renner effect, Multichannel Quantum Defect Theory, the use of variational methods for calculating rotational-vibration energy levels, and the contact transformed rotation-vibration Hamiltonian. A new chapter is devoted entirely to weakly bound cluster molecules (often called Van der Waals molecules). A selection of experimental spectra is included in order to illustrate particular theoretical points.

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Page Count

778

Publisher

NRC Research Press

Published Date

ISBN 10

066019628X

ISBN 13

9780660196282

Before the darkness

By: Per Bak Jensen,Andreas Nilsson

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Before the darkness

By: Per Bak Jensen,Andreas Nilsson

Udstilling, Dunkers Kulturhus, Helsingborg, 30. januar - 3. maj 2009.

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Page Count

263

Published Date

ISBN 10

9197709662

ISBN 13

9789197709668

Book's by Per Bak Jensen

How Nature Works

How Nature Works

Molecular Symmetry and Spectroscopy

Molecular Symmetry and Spectroscopy

Before the darkness

Before the darkness

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