2 for Arsenic 3 Ka-Ming Wai,†,# Shiliang Wu,*,†,‡ Xueling Li,‡ Daniel A. Jaffe, and Kevin D. Perry 4 †Department of Geological and Mining Engineering and Sciences and ‡Department of Civil and Environmental Engineering, 5 Michigan Technological University, Houghton, Michigan, 49931 United States 6 Physical Sciences Division, School of Science, Technology, Engineering, and Mathematics, University...

Relatively few finite non desarguesian flag-transitive affine planes are known whose collineation groups are solvable. With a single exception (see below), all of the known ones of odd order fall into two families studied in [Ka, Su l ] ; those references also contain some historical remarks. The purpose of this note is to construct an additional family of such planes, explain why they are new,...

A general multiobjective optimization and design procedure of a Luneberg lens antenna (LLA) with a compact multiband multi-polarized feed-system for a broadband satellite communication terminal is presented. The LLA utilizes a compact multiband feed horn, consisting of an inner dielectric loaded circular horn for the K/Ka-band (dual-circular polarization) and a coaxial waveguide with axially co...

We introduce a new parameter, symmetric average, which measures the asymmetry of a given non-degenerated convex body K in Rn. Namely, sav(K) = infa∈intK ∫ Ka ‖ − x‖Ka dx/|K|, where |K| denotes the volume of K and Ka = K − a. We show that for polytopes sav(K) ≤ C ln N , where N is the number of facets of K. Moreover, in general n n+1 ≤ sav(K) < √ n and equality in the lower bound holds if and on...

Active antenna arrays working at higher frequencies result in higher packaging densities. The antenna array under consideration operates at about 30 GHz and will be installed in an aircraft. Commercially available power amplifiers at these frequencies have an efficiency of typically 20 %, which results in high amounts of dissipated heat for the required high radiated power. The dissipated power...

The present thesis deals with the design of a planar antenna array for the communication between a civil aircraft (Dassault Aviation’s Falcon) and an Inmarsat satellite. The final goal is to provide high speed Internet access in X/Ku-Band (8-12GHz / 12-18GHz), and possibly even in K/Ka-Band (18-27GHz / 17-40GHz). The study starts with the Ku-Band only, then evolves towards the transmission band...

The dual-frequency altimeter of Topex allows since few years the observations of earth from 62°N to 62°S both in Ku and in C band. Previous works has been already performed above continental areas by [1, 2, 3, 4] and above the southern part of the Greenland ice sheet [5, 6]. These works show the great interest of a dual-frequency above both for the retrieval of some geophysical parameters and f...

1. Aeronautical Communications Systems must be reliable and efficient. Connection to Aeronautical networks is considered to be achieved by satellites with large coverage areas especially over oceanic regions during long-haul flights. The service concept needs to take into account today's peculiarities of satellite communications, thus it must cope with the available or in near future available ...