No abstract

This experiment is mainly aimed to determine which one of various available formulas is the most satisfactory for describing the drag force experienced by a moving object of different shape, size and material in viscous fluid in a long cylindrical container. The interesting problem on drag coefficient Cd and drag function f(R/D, Re) for moving objects of finite-length cylinders are also investigated. We find that Oseen's formula is the best for steel spheres whereas the Happel and Brenner's cylinder formula is satisfactory for Cu and Al cylinders.

No abstract

Our numerical simulation first displays exponential increase of the mean number of attractors with N for K = 2,3,4 and 50≦ N ≦350. The mean length of attractors also increases exponentially with N for K = 2, but increases linearly with N for K = 3,4. We further found the larger the K the larger S/N value; which yields the results that the mean length and the mean number of attractors of critical random Boolean networks will decrease with larger K.