Pentagon shoots across space station's bows
نویسندگان
چکیده
منابع مشابه
Soviet Space Stations: Achievements, Trends, and Outlook
It is a widely held belief that the Soviet space program deliberately follows the paths described in the early years of the century by Konstantin Tsiolkovsky. 1 Be that as it may, it is certainly possible to find close parallels between Tsiolkovsky’s writing and the course of events, but more likely these parallels result because modern engineers have arrived at similar solutions to the same pr...
متن کاملA Space CoBot for personal assistance in space stations
Microgravity environments inside inhabited space stations are particularly challenging for service robots, being quite different from Earth in various ways. In this paper we propose and discuss the design and applicability of a collaborative aerial robot, called Space CoBot, to provide personal assistance to astronauts in microgravity environments. The platform is based on a modular holonomic a...
متن کاملDimensionally Regulated Pentagon Integrals?
We present methods for evaluating the Feynman parameter integrals associated with the pentagon diagram in 4 − 2 dimensions, along with explicit results for the integrals with all masses vanishing or with one non-vanishing external mass. The scalar pentagon integral can be expressed as a linear combination of box integrals, up to O( ) corrections, a result which is the dimensionallyregulated ver...
متن کاملDeflating the Pentagon
In this paper we consider deflations (inverse pocket flips) of n-gons for small n. We show that every pentagon can be deflated after finitely many deflations, and that any infinite deflation sequence of a pentagon results from deflating an induced quadrilateral on four of the vertices. We describe a family of hexagons that deflate infinitely for a specific deflation sequence, yet induce no infi...
متن کاملSteiner pentagon covering designs
Let Kn denote the complete undirected graph on n vertices. A Steiner pentagon covering design (SPCD) of order n is a pair (Kn;B), where B is a collection of c(n)= n=5 n−1=2 pentagons from Kn such that any two vertices are joined by a path of length 1 in at least one pentagon of B, and also by a path of length 2 in at least one pentagon of B. The existence of SPCDs is investigated. The main appr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1987
ISSN: 0028-0836,1476-4687
DOI: 10.1038/326628a0