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Author: Theodore Drange
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3111352870
Category : Language Arts & Disciplines
Languages : en
Pages : 220
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Book Description
No detailed description available for "Type crossings".
Author: Theodore Drange
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3111352870
Category : Language Arts & Disciplines
Languages : en
Pages : 220
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Book Description
No detailed description available for "Type crossings".
Author: George Allan Hagedorn
Publisher: American Mathematical Soc.
ISBN: 0821826050
Category : Mathematics
Languages : en
Pages : 142
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Book Description
The principal results of this paper involve the extension of the time-dependent Born-Oppenheimer approximation to accommodate the propagation of nuclei through generic, minimal multiplicity electron energy level crossings. The Born-Oppenheimer approximation breaks down at electron energy level crossings, which are prevalent in molecular systems. We classify generic, minimal multiplicity level crossings and derives a normal form for the electron Hamiltonian near each type of crossing. We then extend the time-dependent Born-Oppenheimer approximation to accommodate the propagation of nuclei through each type of electron energy level crossing.
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Publisher:
ISBN:
Category : Railroad accidents
Languages : en
Pages : 48
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Book Description
Author: United States. Federal Railroad Administration. Office of Safety
Publisher:
ISBN:
Category : Railroad crossings
Languages : en
Pages : 132
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Book Description
Author:
Publisher:
ISBN:
Category : Railroad accidents
Languages : en
Pages : 48
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Book Description
Author: United States. Bureau of Railroad Safety
Publisher:
ISBN:
Category : Railroads
Languages : en
Pages : 514
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Book Description
Author: United States. Federal Railroad Administration. Office of Safety
Publisher:
ISBN:
Category : Railroads
Languages : en
Pages : 1570
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Book Description
Author: Hoy A. Richards
Publisher: Transportation Research Board
ISBN: 9780309061063
Category : Technology & Engineering
Languages : en
Pages : 68
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Book Description
This synthesis will be of interest to state and local highway personnel who are responsible for the design, construction, and maintenance of road surfaces and to railroad personnel with similar responsibilities associated with highway-rail grade crossings. It will also be of interest to manufacturers and suppliers of pavement and track materials for crossings. It presents information on the current practices related to highway-rail grade crossing surfaces, including the design and selection of crossing surface materials. This report of the Transportation Research Board describes the various types of highway- rail crossing surfaces, and the issues related to design, operation, and maintenance. Design elements include intersection geometry; drainage; special users, such as bicyclists; and descriptions of failures and their causes. Information is presented on crossing material selection factors, including life-cycle costs and on state practices in selection. Funding issues are also discussed.
Author: United States. Federal Railroad Administration. Office of Safety
Publisher:
ISBN:
Category : Railroad crossings
Languages : en
Pages : 424
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Book Description
Author: Thomas Fiedler
Publisher: World Scientific
ISBN: 9811263019
Category : Mathematics
Languages : en
Pages : 341
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Book Description
One-Cocycles and Knot Invariants is about classical knots, i.e., smooth oriented knots in 3-space. It introduces discrete combinatorial analysis in knot theory in order to solve a global tetrahedron equation. This new technique is then used to construct combinatorial 1-cocycles in a certain moduli space of knot diagrams. The construction of the moduli space makes use of the meridian and the longitude of the knot. The combinatorial 1-cocycles are therefore lifts of the well-known Conway polynomial of knots, and they can be calculated in polynomial time. The 1-cocycles can distinguish loops consisting of knot diagrams in the moduli space up to homology. They give knot invariants when they are evaluated on canonical loops in the connected components of the moduli space. They are a first candidate for numerical knot invariants which can perhaps distinguish the orientation of knots.
