..............page:74-77,89
A simple method to measure the fluid velocity
zhang yan xia 1; liu fu dong 2; li wen hui 3 (1 zunhua jianlong steel workers; zunhua hebei 064200; china; 2.zunhua chengiagou iron mine; zunhua hebei 064200; china; 3.department of mathematical; hebei institute of technology; tangshan hebei 063009; chi
..............page:21-25
..............page:6-12,25
A proof of the queueing formula: L=λW
shang zhi en 1; yagn jun hua 2 (1 department of computer; hebei normal university; shijiazhuang hebei 050016; china; 2 department of electronics; hebei normal university; shijiazhuang hebei 050016; china)
..............page:81-83