Numerical Investigation of Active Flow Control Around a Generic Truck A-Pillar.

Large Eddy Simulations (LES) are conducted to study the actuated flow field around a bluff body. The model is a simplified section of a truck. The aim of the work is to model the separation of the flow acting at the front rounded corners, the so called A-pillars, and to minimize the separation of the flow by means of Zero Net Mass Flux synthetic jets. LES data show the interaction of the flow main structures, the separation mechanism and the effects of the actuation on the flow field. The flow is post processed using modal and frequency decompositions. Relevant results in terms of drag reduction were observed for the actuated flow. The principle flow mechanisms are discussed and an optimal actuation frequency, in terms of induced fluctuations and drag reduction, is identified.

[Chronic lymphocytic leukaemia associated with polycythemia vera]. / Hronicna limfocitna leukemija kod bolesnika s pravom policitemijom.

Simultaneous or sequentional but spontaneous occurzence of polycythaemia vera and chronic lymphocytic leukaemia is very unusual. Moreover, the pathogenesis of these two malignancies has not yet been explained. The authors discribed a 64-year-old man with remarkable mild clinical course of polycytheameia vera associated with chronic lymphocytic leukaemia, lasting more than 5 years. Bone-marrow cell culture revealed spontaneous growth of erythroblast progenitors (BFU-E, CFU-E) and reduced number of haemopoietic progenitorus, mainly due to lymphocyte bone marrow infiltration. The patient plasma selectively inhibited growth of the BFU-E and CFU-E progenitor cells of normal bone-marrow, suggesting that some inhibitor of erythrocytopoiesis influenced supression and/or control of one disease by the other.

Subcapsular splenic hematoma vs intrasplenic pancreatic pseudocyst.

An intrasplenic pancreatic pseudocyst may mimic a subcapsular splenic hematoma. Misdiagnosis of this entity may have serious consequences. Particular care should be taken when a patient presents with a cystic mass in the region of the spleen and a history of chronic alcohol abuse, regardless of the presence or absence of a history of a traumatic episode. Thin-needle aspiration is the current diagnostic modality of choice. A high fluid amylase level establishes the diagnosis of an intrasplenic pancreatic pseudocyst.