ABSTRACT
We investigate the distribution of relative velocities between small heavy particles of different sizes in turbulence by analyzing a statistical model for bidisperse turbulent suspensions, containing particles with two different Stokes numbers. This number, St, is a measure of particle inertia which in turn depends on particle size. When the Stokes numbers are similar, the distribution exhibits power-law tails, just as in the case of equal St. The power-law exponent is a nonanalytic function of the mean Stokes number St[over ¯], so that the exponent cannot be calculated in perturbation theory around the advective limit. When the Stokes-number difference is larger, the power law disappears, but the tails of the distribution still dominate the relative-velocity moments, if St[over ¯] is large enough.
ABSTRACT
Alexithymia is defined as a "lack of words for feelings." This deficiency has been suggested to play a role in the formation and maintenance of somatic symptoms. Prior research has found alexithymia prevalent in "classic" psychosomatic disorders. The present study examines the prevalence of alexithymia and its relationship to patient age, sex, and report of pain. The sample was 208 consecutive outpatients evaluated on a Behavioral Medicine Service and presenting with pain as a primary symptom. Results indicated that the prevalence of alexithymia in this study is consistent with prior research using inpatient pain patients and a similar MMPI alexithymia subscale. Additional analyses of the MMPI clinical and validity scales revealed that alexithymic patients were more defensive and presented themselves in a favorable manner reflecting a "normal" picture of mental health. It is suggested that alexithymia may play a role in chronic pain syndromes. Further research is needed to examine this deficiency and its potential etiological significance in these disorders.
