The analysis of lifting point motion and its load is done to be compared with conventional one,hence,a perfect motion performance and power performance,bala.

Analysis of flow rate and polished rod load for hydraulic feedback hollow sucker rod pump;

Effect of centralizer on polished rod load for polymer flooding artificial lift wells;

Mathematical simulation for calculation chart of polished rod load in beam pumping unit

Of all trees on given order n,diameter d and pendant vertices number s, which achieves the maximal spectral radius? Let Tn,d,s be a tree with order n,diameter d and pendant vertex number s obtained by spanning s-2 paths of almost equal lengths at r th-vertex of fixed path Pd+1,where r=r(d) is the integer part on(d+1)/2.