منابع مشابه
Full-Sampling Focal Plane Arrays
The eeciency of single dish mapping and synthesis array mosaicing can be increased by completely sampling the information in the antenna's focal plane. This requires a densely packed array of electrically small elements. Each telescope beam is formed with a weighted combination of signals from seven or more elements. This has the added advantage of correcting for large scale reeector distortion...
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Let B be a square region in the plane. We give an efficient algorithm that takes a set P of n points from B, and produces a set M ⊂ B with the property that the distance to the second nearest point in M approximates the distance to the kth nearest point of P . That is, there are constants α, β ∈ R such that for all x ∈ B, we have αdP,k(x) ≤ dM,2(x) ≤ βdP,k(x), where dM,2 and dP,k denote the sec...
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A 3-uniform hypergraph is called tight if for any 3-coloring of its vertex set a heterochromatic edge can be found. In this paper we study tightness of 3-graphs with vertex set IR and edge sets arising from simple geometrical considerations. Basically we show that sets of triangles with \fat shadows" are tight and also that some interesting sets of triangles with \thin shadows" are tight.
متن کاملRadon-in-Water Sampling Problems
Numerous past studies of waterborne radon sampling and measurement techniques have concluded that today's most frequently used sample collection methods are cumbersome and/or require highly trained and careful technicians. All are prone to error if there is the slightest deviation from the prescribed procedure. Obtaining reasonable accuracy and precision requires a high skill level on the part ...
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ژورنال
عنوان ژورنال: The Annals of Mathematical Statistics
سال: 1949
ISSN: 0003-4851
DOI: 10.1214/aoms/1177729989