Reservoir operation plays an important role in reservoir management. In operation, water balance calculation is a very step. At present, one of the main challenges that inflow cannot be calculated accurately due to jacking reservoir, which produced by downstream after original course river has changed. Another reason capacity influence dynamic storage capacity. order overcome these problems, th...

background&aim;:blood loss reducing approaches improve surgery outcomes through making appropriate operation field and reducing transfusion needing . in this study two blood loss reducing techniques compare with together. method & material:in a randomized clinical trial study 60 patients candidate for elective femoral shaft operation were included in two groups.the first group induced hypotensi...