abstract: impeller trimming is a proper way to alter the performance of centrifugal pump with a constant speed so as to meet the demand on the specified flow rate and head in pumping systems. the affinity law accounting for the impeller trimming is the key relation to determine the pump performance with a trimmed impeller. there seems no experimental study dealing with such an affinity law for ...

To investigate the impact of soaking strategy on entire shut-in, flowback, and production processes following hydraulic fracturing, we developed a core simulation system using nuclear magnetic resonance technology to track fluid migration across process. This system, with specially designed sample, enabled us quantify contribution each stage oil analyze stimulation mechanism from an integrated ...

Distributed systems execute background or alternative jobs while waiting for data or requests to arrive from another processor. In those cases, the following shut-down scheduling problem arises: given a set of jobs of known processing time, schedule them on m machines so as to maximize the total weight of jobs completed before an initially unknown deadline. We will present optimally competitive...