An incompressible Newtonian fluid flows steadily betweentwo infinitely long, concentric cylinders as shown in Fig. P6.96.The outer cylinder is fixed, but the inner cylinder moves with alongitudinal velocity V0 as shown. The pressure gradient in theaxial direction is p/. For what value of V0 will the drag on theinner cylinder be zero? Assume that the flow is laminar, axisymmetric,and fully developed.
9/19/17 Generation Interval The average age of the parents when offspring are born The shorter the generation interval, the faster the genetic improvement Selection Methods Tandem selection- selection for one trait at a time o Least effective- makes rapid gain in a single trait, but is slow to reach selection goal involving several traits Independent culling- establishes minimum culling levels for each trait o Makes SLOWER gain for each trait, but reaches goals faster. Most effective when few traits are involved o (No matter what they look like, as long as they meet the requirements they’re good) Selection Index- each animal is rated numerically by combining performance of several traits into a single index o New Mexico Ram Test Selection Index Index= 12 + 40(ADG) + 30(CWF) + SL – 12(DIA) - .5(VAR) ADG- average daily gain CFW- Clean wool fibers SL- Staple length- (how long is the wool) DIA- fiber diameter (diameter of wool in microns) VAR- difference between side and britch (variability, less= more points) Heritability- the amount of phenotypic expression of a trait that s transmitted to the offspring Breeding Systems Purebred Breeder- develop breeding stock that possess the highest predictability for transmitting the most desirable inheritan
