naxmike.blogg.se - Serial vs parallel search strategy definition

Evidence for this method is also found in reaction time studies. On the other hand, exhaustive implies that comparisons continue until the entire set is compared and then a response is generated. This is because, on average, participants (on positive trials) will stop comparisons about halfway through when they find the target match but participants (on negative trials) will need to compare until the end when no target match is found. If the reaction time slope for a positive trial (where the target was present in the memory set) is about half of the slope for a negative trial (where the target was not present in the memory set) this demonstrates self-terminating processing. Evidence for this method is found in reaction time studies. Self-terminating implies that comparisons stop abruptly as soon as the target is found, and then the response is generated. Serial memory processing can be either self-terminating or exhaustive. In practice, if one of the pumps in parallel or series stops, the operation point moves along the system resistance curve from point 3 to point 1 - the head and flow rate are decreased.Hypothetical slopes for positive and negative trials Note! In practice the combined head and volume flow moves along the system curve as indicated from 1 to 3.

for two identical pumps in parallel and the head kept constant - the flow rate doubles compared to a single pump as indicated with point 2.

When two or more pumps are arranged in parallel their resulting performance curve is obtained by adding the pumps flow rates at the same head as indicated in the figure below.Ĭentrifugal pumps in parallel are used to overcome larger volume flows than one pump can handle alone.

Operation of single stage pumps in series are seldom encountered - more often multistage centrifugal pumps are used.

the flow for each pump equals the flow at point 3.

the head for each pump equals half the head at point 3.

Note that for two pumps with equal performance curves running in series

point 1 is where the system operates with one pump running.

point 3 is where the system operates with both pumps running.

With a constant flowrate the combined head moves from 1 to 2 - BUT in practice the combined head and flow rate moves along the system curve to point 3. for two identical pumps in series the head will be twice the head of a single pump at the same flow rate - as indicated with point 2.When two (or more) pumps are arranged in serial their resulting pump performance curve is obtained by adding their heads at the same flow rate as indicated in the figure below.Ĭentrifugal pumps in series are used to overcome larger system head loss than one pump can handle alone. Pumps can be arranged and connected in serial or parallel to provide additional head or flow rate capacity.