6,469 research outputs found
The display of spatial information and visually guided behavior
The basic informational elements of spatial orientation are attitude and position within a coordinate system. The problem that faces aeronautical designers is that a pilot must deal with several coordinate systems, sometimes simultaneously. The display must depict unambiguously not only position and attitude, but also designate the relevant coordinate system. If this is not done accurately, spatial disorientation can occur. The different coordinate systems used in aeronautical tasks and the problems that occur in the display of spatial information are explained
Cumberland Congregational Church History and Vital Records 3rd Edition
https://digitalmaine.com/cumberland_books/1008/thumbnail.jp
Record of Persons Liable to Enrollment in the Militia of Maine, Town of Cumberland, 1881-1917
https://digitalmaine.com/cumberland_books/1068/thumbnail.jp
1910 and 1920 U.S. Census: Cumberland Town, Cumberland County, Maine
https://digitalmaine.com/cumberland_books/1003/thumbnail.jp
Vital Records of Cumberland, Maine 1701-1892
https://digitalmaine.com/cumberland_books/1000/thumbnail.jp
1896 List of Students in Cumberland Schools 2nd Edition
https://digitalmaine.com/cumberland_books/1002/thumbnail.jp
“Changes in Character of Response”: Population Decline in Cumberland, Maine, 1860-1920
https://digitalmaine.com/cumberland_books/1078/thumbnail.jp
Heralded single-photon generation using imperfect single-photon sources and a two-photon-absorbing medium
We propose a setup for a heralded, i.e. announced generation of a pure
single-photon state given two imperfect sources whose outputs are represented
by mixtures of the single-photon Fock state with the vacuum
. Our purification scheme uses beam splitters, photodetection and a
two-photon-absorbing medium. The admixture of the vacuum is fully eliminated.
We discuss two potential realizations of the scheme.Comment: 22 pages, 8 figures (LaTeX). In version v2 we have slightly modified
our setup so as to increase the success probability of single-photon
generation by a factor of two. In addition, in an appendix we discuss
alternative realizations of single-photon generation without a Mach-Zehnder
interferometer. Three new figures have been added. Version v3 is a revised
version published in Phys. Rev. A. It contains numerous minor corrections and
clarifications. A new figure has been added in order to clarify our
convention regarding labelling the field modes. The action of the beam
splitters in the Schroedinger picture is introduced. A new reference has been
include
Locating the Old Houses of Cumberland Maine
https://digitalmaine.com/cumberland_books/1001/thumbnail.jp
- …