0:00:04hi my name is john ryan mlp he can it and the university present are
0:00:09and have a particle correlation properties of quite the motion and bacterial suspension
0:00:15this work was done in collaboration with my adviser professor winded role in that and
0:00:19they as well and restock were then you were then at argonne national laboratory
0:00:24the objective of this work is the study of the non trivial spatial temporal correlation
0:00:28that are merged in the course of quite a swimming of motel bacteria
0:00:33a new design experiments performed on a suspension of battle but it was
0:00:38where an initial you artwork text is induced in the system settle down into a
0:00:42corpus they want the ultrasound is turned off
0:00:45the following that illustrates this experiment
0:00:47in this movie probability real suspension is based on the glass slide all that an
0:00:52ultrasound transducer
0:00:54sorry switched on which results in the generation of service category waves in the drawer
0:01:00no zoo main to see what has on the suspension
0:01:04one result is turned off quite patterns into a more
0:01:10just study concave known a observed in experiment a simple theoretical model is introduced whereby
0:01:15frame is represented as a point four stifle with side the recall from actual and
0:01:20she
0:01:21the model thing to know how to fundamental mechanisms that for high dynamic interactions and
0:01:26short range bacterial collision
0:01:29efficient numerical simulations of the model capture the transitions the collective state in the following
0:01:34week taken from simulation we see local regions of collective motion characterized by i work
0:01:39is to the in red or blue
0:01:41one can see from this movie then we the collective motion form and we went
0:01:46well errors in the movie represent all would velocity
0:01:52a striking result was observed namely the correlation aligned is independent of the concentration is
0:01:56something to be on the particle concentration rifle despite the greater injection of energy this
0:02:02verifies the experimental work also have an air and then recently away from here on
0:02:06two thousand well
0:02:08although we came any new results with the idea that are quite the motion bind
0:02:13that in the evolution of the correlation length versus time
0:02:16yes we use stimulation is to separate the effect that tumbling and we'll timings p
0:02:22to identify tumbling is the true source of the decrease in correlation align when adding
0:02:26concentration as well when experiment
0:02:30we study effect and aspect ratio and dipole moment which may be harder to control
0:02:34experiment to demonstrate that swimmers size and shape are responsible for the properties of the
0:02:38collective state
0:02:42one of the many interesting conclusion the this work is that equation and increase the
0:02:46correlate going whereas high dynamic interactions and to decrease the correlation going
0:02:50this shows that the quite the dynamics in really high dynamic models maybe fundamentally different
0:02:54than that observed in experiments episode of an air and
0:02:58i hope that you find this paper interesting and if you have any further questions
0:03:02we use a factor