By Mark Lardas
Via 1805 the 44-gun frigate used to be most likely seen as a failed scan while the 38-gun frigate used to be considered because the vessel of the longer term. Ten years later each army was once construction 44-gun frigates and at the present time it really is considered because the image of the Napoleonic-era cruiser. This awesome transformation resulted from the functionality of 3 ships – the structure, usa, and President – 44-gun frigates outfitted for the U.S. military among 1794 and 1799. Their victories within the naval warfare of 1812, in addition to their functionality opposed to the Barbary Pirates, stuck the mind's eye of the area – and spurred all navies into re-examining the category.
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Extra info for American Heavy Frigates 1794-1826
It decreases for a doping level of 1 0 and disappears entirely above a doping level of 3 X 1 0 boron atoms per c m . This is consistent with the a c t i o n found for deeper traps where the overlapping of the wave functions from adjacent boron atoms eliminates the trapping energy. In accordance with the interpretation given below the intervalley relaxation time is extended along the dashed line until it approaches the collision line. An attempt was made to verify this concept by measuring the velocity and attenuation for a doping of 5 X 1 0 boron atoms per c m .
3 X 1 0 boron atoms per c m . The corresponding attenuation differences are shown by Fig. 35. F o r the highest doping level, scattering of the wave occurs due probably to segregation of the impurities and attenuation measurements can be made only to 100 Mc. The indicated relaxation time is less than 1 0 ~ sec independent of the temperature. The intersurface relaxation times can be calculated from the equation 1 4 2 0 1 9 1 9 3 13 (73) nepers/cm where Ac is the change in elastic modulus deduced from the difference in velocities of the doped and undoped samples.
30 it appears that the relaxation time of impurity scattering is determined by the ratio of the number of collisions which cause a change of valley to the total number of collisions. 025 for phonon scat16 3 17 FIG. 3 1 . 3 Attenuation for longitudinal waves in pure and p-type silicon with a doping o f 2 . 5 x 1 0 b o r o n a t o m s per c m . 1 8 3 tering at room temperature. The time of 2 x 10~ sec as compared to the overall scattering time of 2 X 10~ sec calculated previously, indicates that about 1 in 10 collisions results in a change of valley at a doping of 3 x 1 0 arsenic atoms per c m .