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Träfflista för sökning "WFRF:(Smith D. A.) srt2:(1985-1989)"

Sökning: WFRF:(Smith D. A.) > (1985-1989)

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1.
  • Li, C-H., et al. (författare)
  • A lattice resolution study of the martensitic transformation of small iron particles in a copper matrix
  • 1985
  • Ingår i: Acta Metallurgica. - : Elsevier BV. - 0001-6160. ; 33:2, s. 317-328
  • Tidskriftsartikel (refereegranskat)abstract
    • The martensitic transformation of small, fully coherent, gamma iron precipitates in an epsilon copper matrix, brought about by the bombardment of thin foils with argon ions, has been studied using lattice fringe imaging. It is found, in general, that only partial transformation of individual particles occurs, this corresponding to a simple homogeneous shear (a Bain strain). In addition, the transformation is limited to particles located within about two particle diameters of the foil surface. It is established that the mere presence of a Frank (or Shockley) loop in a particle, due to the bombardment, is insufficient to trigger the transformation. The implications of this result are discussed with reference to bulk martensite. In the present case, it is concluded that transformation may simply initiate at sites of local decohesion or microslip at the matrix/particle boundaries brought about by vacancy condensation following ion bombardment, these sites being most effective in the vicinity of free surfaces
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2.
  • Smith, S M, et al. (författare)
  • Role of neutrophils in hemorrhagic shock-induced gastric mucosal injury in the rat
  • 1987
  • Ingår i: Gastroenterology. - 0016-5085 .- 1528-0012. ; 93:3, s. 466-471
  • Tidskriftsartikel (refereegranskat)abstract
    • Gastric mucosal clearance of 51Cr-labeled red blood cells (51Cr-RBC) was measured in rats during a 30-min control period, a 30-min ischemic period (hemorrhage to 27 mmHg arterial pressure), and a 60-min reperfusion period (reinfusion of shed blood). In untreated (control) rats, a dramatic rise in the leakage of 51Cr-labeled red blood cells into the gastric lumen was observed during the reperfusion period. Treatment with neutrophil antiserum attenuated 51Cr-labeled red blood cell flux into the gastric lumen. Using the radioactive microsphere technique, neutrophil-depleted animals were shown to have higher blood flows in the ischemic period than the untreated rats. Bleeding of untreated rats to a mean arterial pressure of 40 mmHg resulted in blood flows that were not different from those in antiserum-treated rats bled to 27 mmHg and leakage of 51Cr-labeled red blood cells similar to that measured in antiserum-treated rats. The results of this study indicate that neutrophils play an important role in hemorrhagic shock-induced gastric bleeding.
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