Ultra-wideband (UWB) signals originated from research and development work on high resolution radiofrequency (RF) radar systems in the 1950-60s. The current FCC regulations in the US, define a UWB signal as having an absolute bandwidth which exceeds 500 MHz or fractional bandwidth over 20%. The FCC frequency band assigned to UWB systems extends from 3.1 GHz to 10.6 GHz, i.e. a bandwidth of 7.5 ...

I. THE 1996 TELECOM ACT OVERVIEW...................................... 32 II. IS THE FCC THE REGULATORY SOLUTION? ........................... 33 A. Disparities in Regularity Treatment ...................................... 34 1. Pricing issues.................................................................... 35 2. Service roll out .................................................................

We present results from density functional theory and computer simulations that unambiguously predict the occurrence of first-order freezing transitions for a large class of ultrasoft model systems into cluster crystals. The clusters consist of fully overlapping particles and arise without the existence of attractive forces. The number of particles participating in a cluster scales linearly wit...

The finite-temperature magnetism of Ni and permalloy in body-centered-cubic bcc and face-centered-cubic fcc phases is studied theoretically using ab initio supercell calculations and Green’s function methods. The results confirm and explain the general experimental trend that the fcc phases have higher Curie temperatures than the bcc counterparts. In addition, the spin-wave stiffness constants ...

The partial occupation numbers and density of states (DOS), and the total DOS at the Fermi level are calculated as a function of reduced atomic volume for bcc and fcc alkali metals employing the linearmuffin-tin-orbital (LMTO) method. By means of the abrupt changes obtained in the partial and total DOS values at the Fermi level, good agreement with regard to experiment were found in predicting ...

This paper shows that, contrary to their favourable effect in the EU non-FCC (Former Communist Countries), fiscal rules do not significantly affect performance group of FCC. finding, which may echo differences between FCC and other inherited from Cold War period, is robust when considering various estimation methods, dividing along dimensions, using several observed computed measures performanc...

Structures of carbon supported Pt-Ru catalyst in a polymer-electrolyte-fuel-cell (PEFC) were analyzed by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAFS). XRD analysis identified a face-centered-cubic (fcc) alloy structure for Pt-Ru. XAFS analysis revealed that Pt and Ru atoms were, however, not randomly distributed in the Pt-Ru fcc lattice. A Pt atom was more likely surrounded ...

In UWB systems three factors have to be considered to design a radio link: (i) peakand (ii) average power limits defined by FCC Regulations and (iii) low supply voltage available in handheld cheap devices. An exact mathematical model for the interpretation of FCC Regulations is derived. The radio coverage of UWB networking devices is determined and a chaos-based approach for the coverage extens...

A quasi-sd4 hybridization state for group VIIIB and IB face-centered cubic (FCC) transition metals in low-dimensional nanostructures is identified, in contrast to the sd5 hybridization state in bulk. For Au, a novel three-shelled nanowire is designed with a hexagonal close-packed core in the sd5 hybridization, wrapped by FCC-(111) shell that adopts the quasi-sd4 hybridization. This new nanostru...