Current SAE practices for evaluating potential improvements in fuel economy on heavy-duty vehicles rely on gravimetric measurements of fuel tanks. However, the recent evolution of portable emissions measurement systems (PEMS) offers an alternative means of evaluating real-world fuel economy that may be faster and more cost effective. This paper provides a direct comparison of these two methods ...

The Military Geographic Institute (IGM) is the institution responsible for maintaining and updating official geodesic reference system of Chile put into effect through National Geodesic Network (RGN), which consists Horizontal Vertical RGNs. This latter element made up leveling network, constituted by altitude points referenced to Mean Sea Level (M.S.L.) Gravimetric Network, consisting absolute...

Gravimetric quantities are commonly represented in terms of high degree surface or solid spherical harmonics. After EGM2008, such expansions routinely extend to spherical harmonic degree 2190, which makes the computation of gravimetric quantities at a large number of arbitrarily scattered points in space using harmonic synthesis, a very computationally demanding process. We present here the dev...