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Abstract:Abstract. In this paper we consider a restricted class of polyominoes that we call Z-convex polyominoes. Z-convex polyominoes are polyominoes such that any two pairs of cells can be connected by a monotone path making at most two turns (like the letter Z). In particular they are convex polyominoes, but they appear to resist standard decompositions. We propose a construction by ?inflation ? that allows to write a system of functional equations for their generating functions. The generating function P(t) of Z-convex polyominoes with respect to the semi-perimeter turns out to be algebraic all the same and surprisingly, like the generating function of convex polyominoes, it can be expressed as a rational function of t and the generating function of Catalan numbers. 1.
Operational and environmental tests of pressure regulator for Apollo spacecraft access arm
Operational and environmental tests of pressure regulator for Apollo spacecraft access arm
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Conference August 16-25, 2001 ?La bibliograf?a nacional debe presentarse de manera que satisfaga las necesidades de los usuarios.? Esta es una de las recomendaciones de la Conferencia Internacional sobre Servicios Bibliogr?ficos Nacionales (Copenhague, 1998), aprobadas por la Junta Profesional de la IFLA en 1999. En este siglo de realidad virtual, los usuarios esperan que la recuperaci?n de la informaci?n sea r?pida. Afrontar el reto de las necesidades de los usuarios es una tarea de dif?cil ejecuci?n. Lo que significa que una Agencia Bibliogr?...
No Abstract Available
No Abstract Available
Human speech perception is robust in the face of a wide variety of distortions, both experimentally applied and naturally-occurring. In these conditions, state-of-the-art automatic speech recognition technology fails. This paper describes an approach to robust ASR which acknowledges the fact that some spectro-temporal regions will be dominated by noise. For the purposes of recognition, these regions are treated as missing or unreliable. The primary advantage of this viewpoint is that it makes minimal assumptions about any noise background. Inst...
Operational and environmental testing of calibration valve for pressure sensing instruments at Launch Complex 34
Operational and environmental testing of calibration valve for pressure sensing instruments at Launch Complex 34
The behavior of a vertical jet of helium issuing into a co-flow of air at a fixed exit velocity ratio of 2 was investigated experimentally over a wide range of governing parameters with emphasis on flow structure and the scaling properties of the natural frequency of the jet. The experiments were conducted in a variable-pressure facility, which made it possible to vary the Reynolds number and the Richardson number independently. At all the experimental conditions studied, the flow exhibits a strong self-excited periodicity. A buoyancy Strouhal ...
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provost of the University of Virginia and author of `Health Care Half Truths: Too Many Myths, Not En...
over. It gets old fast, and it's usually wrong (they have changed!) and the photography, while lovel...
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In mathematical number theory and computer science, a Morton...
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