A planar phased-array antenna has been constructed from a 15x15 square grid of z-directed monopoles with a length of 0.475 λ, element spacing of 0.29 λ, average directivity of 20.0 dBi across all scan angles, an average H-plane HPBW of 37 degrees, an average E-plane HPBW of 23 degrees, and an efficiency of 99.6%. Two current distributions are tested: uniform and binomial. The binomial current d...

The subject of the research is optimization mechanism cross planer. In article, on basis condition closed contours, equations projection links corresponding coordinate axes are compiled. A functional relationship has been established between kinematic parameters characterizing movement input and output mechanism. obtained numerical calculations presented in form graphic dependences. aim work op...

Review of Ronald J. Planer and Kim Sterelny’s From Signal to Symbol – Sterelny, Symbol: The Evolution Language. Cambridge: MIT Press (2021), 296 pp., $35.00 (hardcover)

Effect of drying temperatures 180 Defect categories 180 Rupture of wood tissue 180 surface checks 180 End checks and splits 182 Collapse 183 H o n e y c o m b 1 8 5 Ring failure 186 Boxed-heart splits 186 Checked knots 186 Loose knots 186 Warp 187 Uneven moisture content 188 Board rejects 188 Water pockets 188 Control measures 188 Discoloration 189 Sapwood discolorations 189 Heartwood discolora...

This paper presents a methodology to analyze dynamics of flexible space robot using bond graph. In case of space robots the position and orientation of the satellite main body may change when the manipulator moves. Motion of the space robots also induces vibrating motions in structurally flexible manipulators. Researchers working on terrestrial flexible robot arms principally have focused on is...

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objective: in recent years, farmers have shown great interest to using native drill planter rather than complex planters to grow vegetables. methods: in this study, we tested a native planter independent variables were the two types of substrate surface (asphalt and plowed field), three ground speed (3, 5 and 7 kph) and four types of seeds (tomatoes, onions, radishes and lettuce). dependent var...