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The effect of physical structure on δI curves of longitudinal thin film (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)

Walmsley, N. S. ; Hart, A. ; Parker, D. A. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 4915-4915

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Conventionally, the simulation of thin films has been carried out using an HCP structure to represent its physical structure. Such an idealized structure has been shown to overestimate the effect of interparticle coupling by using an homogeneous exchange coupling scheme. A more realistic approach to represent physical structure has been undertaken by generating a system of grains which lie on a radially isotropic structure and have a nonuniform volume distribution. Interaction effects can be shown by computing δI curves formed through the comparison of the remanence curves using the Wohlfarth relation. To generate an isothermal remanence curve (IRM), a realistic ac erased state is necessary which has been carried out by using a simulated annealing technique. A comparison has been made to determine the effect of physical structure on the bulk properties by computing hysteresis loops, remanence curves, and δI curves. To reduce statistical error these have been averaged over four different sets of easy axes. The loops indicate that an irregular physical structure leads to an increase in the coercivity and decrease in the squareness. The dc-demagnetization curves show an increase in remanent coercivity; this can be attributed to the random physical structure decreasing the size of magnetically correlated regions within the microstructure. The effect of the physical microstructure on the δI curves will be discussed in full in the paper. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.361585

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Systemic haemostatic alterations during no-flow ischaemia and reperfusion of the ascending colon in ponies (1996)

Darien, B. J. ; Stone, W. C. ; Hart, A. P. ; [et al.]

Springer

Comparative clinical pathology 6 (1996), S. 63-69

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ISSN: 1433-2981

Keywords: Antithrombin III ; Colon ; Ischaemia and Reperfusion ; Pony

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Naturally occurring and experimentally induced ascending colon volvulus (ACV) result in transmural compression, increased microvascular permeability and thrombosis and necrosis of the intestinal mucosa analysis of haemostatic variables in horses with naturally occurring ACV have identified changes in plasma antithrombin III (AT III) activity as the most reliable for diagnosing hypercoagulation and predicting survival. In an experimental pony model of no-flow ACV, which results in microvascular injury and thrombosis, systemic haemostasis was evaluated during ischaemia and reperfusion to determine whether selected haemostatic assays consistently yield results suggestive of altered haemostasis (hypercoagulation). Ten normal adult ponies were randomly divided into two equal groups (Group 1, control; Group 2, experimental volvulus). All experiments were performed under general anaesthesia and were terminal. Haemostatic variables (prothrombin time, PT; activated partial thromboplastin time, APTT, platelet count, fibrinogen concentration, and plasma AT III activity) were measured prior to general anaesthesia, immediately before colonic volvulus, at 60 and 120 min of ischaemia, and at 60 and 120 min of reperfusion. Mean plasma AT III activity decreased in both the control and experimental groups after induction of general anaesthesia. Mean plasma AT III activity continued to decrease after reperfusion in Group 2 ponies and differed significantly (p〈0.05) from control ponies at 120 min of reperfusion. Prothrombin time, APTT, platelet count and fibrinogen concentration values were not significantly different between groups. The decreased plasma AT III activity following the experimental procedures in this model of no-flow colonic ischaemia and reperfusion was suggestive of systemic hypercoagulation.