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Pregnancy During pregnancy , the volume of blood is increased in a woman 's body and can stress the heart . This has amplified the impacts of transportation decision-making and has brought about a paradigm shift in the way that the flow of traffic is managed . The deficiency in density is diminished over distance from the source by entrainment of ambient water into the plume . The program of work involves four themes : new developments of CASA to deal with the need to exploit the temporal organisation of events at multiple time-scales ( Theme 1 ) and the need to improve sound-source segregation by coupling events expressed in different representations by a combination of bottom-up and top-down processes ( Theme 2 ) .