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

Give Us Your Poor and Indigent

https://digitalmaine.com/cumberland_books/1059/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 $\ket{1}$ with the vacuum $\ket{0}$. 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