منابع مشابه
The Tycho User Interface System
Tycho is the next-generation user-interface system we are building for the Ptolemy project. It is a complete [incr Tcl] application structured as an extensible class library. Our goal is to make it easy to extend this basic application with functionality and a user interface for specialized applications such as electronic design and simulation. The Tycho library includes a selection of general-...
متن کاملElementary Gates for Quantum Computation Tycho Sleator
We show that a set of gates that consists of all one-bit quantum gates (U(2)) and the two-bit exclusive-or gate (that maps Boolean values (x; y) to (x; xy)) is universal in the sense that all unitary operations on arbitrarily many bits n (U(2 n)) can be expressed as compositions of these gates. We investigate the number of the above gates required to implement other gates, such as generalized D...
متن کاملComparing Tycho–2 Astrometry with Ucac1
The Tycho–2 Catalogue, released in February 2000, is based on the ESA Hipparcos space mission data and various ground–based catalogs for proper motions. An external comparison of the Tycho–2 astrometry is presented here using the first U.S. Naval Observatory CCD As-trograph Catalog (UCAC1). The UCAC1 data were obtained from observations performed at CTIO between February 1998 and November 1999,...
متن کاملLeiden Observatory
In this paper we summarize the main properties of the ENACS (the ESO Nearby Abell Cluster Survey), which was one of the ESO Keypro-grammes carried out in the first half of the 1990's, and we discuss some recent work on the properties of the galaxies in the rich clusters in the ENACS sample. We stress the importance of the ENACS sample as a local , volume-limited sample of rich ACO clusters, whi...
متن کاملMorphological Analyses of Tycho Crater with Kaguya Data
M. Ohtake, T. Matsunaga, Y. Yokota, T. Morota, C. Honda, Y. Ogawa, T. Sugihara, H. Miyamoto, H. Demura, and N. Asada, The University of Aizu, Ikki-machi, Aizu-Wakamatsu, Fukushima, 965-8580, Japan, The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, National Institute for Environmental Studies, Center for Deep Earth exploration, Japan Agency for Marine-Science ...
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ژورنال
عنوان ژورنال: Nature
سال: 1901
ISSN: 0028-0836,1476-4687
DOI: 10.1038/065104a0