Dataset:  asphalt_binder.csv

Source: J. Wei, F. Dong, Y. Li, and Y. Zhang (2014). "Relationship Analysis
Between Surface Free Energy and Chemical Composition of Ashalt Binder," 
Construction and Building Materials, Vol. 71, pp. 116-123.

Description: Experiment relating:
Asphalt suface free energy in mJ/m^2 (srf.fr.eng)
to groups of Component and Elemental Factors:
% Saturates (saturates)
% Aromatics   (aromatics)
% Resins    (resins)
% Asphaltenes  (asptenes)
% Wax     (wax)
% Carbon    (carbon)
% Hydrogen    (hydrogen)
% Oxygen     (oxygen)
% Nitrogen   (nitrogen)
% Sulfur    (sulfur)
Nickel in ppm   (nickel)
Vanadium in ppm   (vanadium)