The effect of thermal radiation, heat generation, suction/injection, nanoparticles type, and nanoparticle volume fraction on heat transfer characteristics and the mechanical properties of unsteady moving cylinder embedded into cooling medium consist of water with Cu; Ag or Al2O3 particles are studied. The governing time dependent boundary layer equations are transformed to ordinary differential equations containing unsteadiness parameter, thermal radiation parameter, heat source parameter, suction/injection parameter, curvature parameter, nanoparticle volume fraction and Prandlt number. These equations are solved numerically. The velocity and Temperature profiles within the boundary layer are plotted and discussed in details for various values of the different parameters. Also the effects of the cooling medium and the external thermal forces on the mechanical properties of the cylinder are investigated.

Original scientific paper https://doi.org/10.2298/TSCI170911279AIn this paper, the effect of convective boundary conditions, heat generation, Brownian motion, and thermophoresis on heat transfer characteristics of a moving cylinder embedded into cooling medium consists of water with nanoparticles are studied. The governing boundary-layer equations transformed to ODE using similarity transformation method and then solved analytically using optimal homotopy asymptotic method for the general case. The velocity, temperature, and concentration profiles within the boundary-layer plotted and discussed in details for various values of the different parameters. Moreover, the effect of boundary-layer behavior on the surface shear stress, rate of heat and mass transfer investigated.

Myocardial infarction (MI) is one of the main causes of death from cardiovascular disease. Curcumin was shown to exert potent antioxidant, anti-inflammatory, antiangiogenic, antimutagenic, anticoagulant and antidiabetic activities. This study was done to investigate the protective effects of curcumin in isoproterenol (ISO) induced myocardial injury in rats. Forty-eight rats were divided into 6 equal groups. Group I: (normal control) rats received no drugs. Group II :(curcumin) rats received curcumin (200 mg/kg b.wt/day) orally for 30 days. Group III: (acute myocardial infarction) rats injected ISO (20mg/kg b.wt /intraperitoneally) twice at the 29 th and 30 th days of experiment. Group IV: (chronic myocardial infarction) rats injected ISO (20mg/kg b.wt /intraperitoneally) twice at the 1 st and 2 nd days of experiment. Group V: (acute myocardial infarction + curcumin) rats received curcumin (200 mg/kg b.wt/day) for 30 days, then ISO was injected twice, at an interval of 24 hours, on the 29 th and 30 th days .Group VI: (chronic myocardial infarction + curcumin) rats injected ISO at the 1 st and 2 nd days of experiment and treated with curcumin for 30 days. Blood samples and heart tissue specimens were collected at the end of experimental period (30 days) for determination of serum Creatine kinase MB (CK-MB), Lactate dehydrogenase (LDH), cardiac Troponins (cTn) and Interleukin-1β (IL-1β). Moreover, heart tissues catalase (CAT), glutathione peroxidase (GPx), reduced glutathione (GSH) and L-Malondialdhyde (L-MDA) were also determined. The obtained results showed a significant increase in serum cardiac marker enzymes (CK-MB and LDH) activities, cTn and IL-1β concentrations in addition to L-MDA in heart tissues of ISO-induced myocardial injury in rats. However, GPx and CAT activities and GSH concentration in heart tissues of myocardial infarction induced in rats were markedly decreased. Curcumin treatment was able to protect rat myocardium against isoproternol induced myocardial ischemic damage and the protective effect was attributed to its antioxidant properties by inhibiting free radical generation.