Figures 2(a) and 2(b) show the results for a batch distillation column operating at constant reflux ratio of 2.0 with ten theoretical stages. In Figure 2(a) it is observed that at the bottom of the column, the composition of benzene decreased with time while the composition of the heavy components increased.arolo and Guarice [ 8 ] extended their continuous short-cut method to batch distillation columns and used an infinite stage column. Seader and Henley [ 9, 10 ] applied Sundaram and Evans [ 3 ] method and showed how the FUG equations were used to solve a simulation problem with constant reflux.
Executive Summary on Persistence and Retention Topics. â¢ Retention rates commonly measure the percentage of freshmen that re-enroll the next academic year as sophomores. The primary reason that retention rates, along with graduation rates, are important is that retention rates are. perceived as indicators of academic quality and student success. â¢ In addition to retention, persistence, a studentâs continuation behavior leading to a desired goal, helps describe.
Retention Retention rates are a measure of academic progression of a group of students from one period of time to the next. Graduation rates are a measure of the success of those students in attaining their academic goals. Both retention rates and graduation rates are affected by student characteristics, choices, and behaviors and by institutional characteristics and programs. A retention rate is the percentage of students in a given cohort who are enrolled in a USG institution in a specified term (in this case, one year later) or are not enrolled in the specified term but have graduated from a USG institution between matriculation and that