In this work, entropy generation impact in an axisymmetric flow of Carreau nanofluid due to a radially stretching sheet has been scrutinized along with non-linear thermal radiation. Both the shear-thickening and thinning of fundamental of Carreau nanofluid have been examined. Buongiorno model is adopted to capture the Brownian motion and thermophoresis influences by the presence of nanofluids. By picking appropriate transformations, constitutive equations of the present problem have been converted into the ordinary differential equation. The reduced system is solved by numerical technique bvp4c. The effect of non-dimensional pertinent parameters against the velocity, entropy, skin friction coefficient, temperature, Nusselt number, Bejan number, Sherwood number, and concentration are talked over and showed with the assistance of graphs and tables. Our obtained results show that entropy generation rises with increasing Brinkman number, magnetic field parameter, Eckert number, temperature difference, and diffusive variable while it declines for the Brownian diffusion parameter.

The objective of this work is to scrutinize the entropy production and its effects on Carreau nanofluid flow over a horizontally stretching cylinder. The significant influence of magnetic field, non-linear thermal radiation and Joule heating have been studied to control the heat transfer rate. The importance of nanofluid parameters, Brownian and thermophoresis diffusion, is argued on Carreau nanofluid motion for shear-thinning and thickening behavior. Utilizing convenient transformations, the fundamental equations, devised to a nonlinear system of ordinary differential equations (ODEs), are resolved numerically by Matlab technique bvp4c. The influence of relevant parameters on velocity, Bejan number, temperature, entropy and concentration profiles are examined by virtue of graphs. Furthermore, we determine the repercussion of indistinguishable parameters over skin friction and Sherwood number via tables. From the acquired results, we perceive that entropy generation augments with enhancing magnetic field parameter, Brinkman number, curvature parameter, Eckert number, and power law index while it declines for the Brownian diffusion parameter. Also, skin friction reduces for the magnetic field and curvature parameter whereas it rises for Weissenberg number. Moreover, Sherwood number escalates for the Schmidt number and curvature parameter.

Objective: To access the role of radial K-space sampling technique for the compensation of motion artifact in magnetic resonance imaging (MRI). Study Design: Systematic Literature Search. Setting: Department of Radiology, Shalimar Hospital, Lahore. Period: March 2019 to Oct 2019. Material & Methods: Was conducted with the help the of following search engines: Google scholar, PubMed, NCBI, Medline and Medscape databases from 1999 up to 2019 for names or acronyms of Radial K-space sampling, propeller sequence, management of motion artifact in MRI, RADAR sequence for motion compensation in MRI, k-space in clinic and multivane. Only those studies were included in this review study which shows the role of radial K-space sampling Technique for compensation of motion artifact. Total 104 studies were selected and after evaluation only 42 studies were included. Results: According to literature radial k-space sampling improved the quality of image and provided the scans with reduced motion artifact. Whereas in case of specificity (N= 16) the mean calculated value was 80.87 and Std. Deviation was 7.022. In case of radial k-space sampling technique (N=42) calculated mean was .26 and std. deviation was .701. The main disadvantage of radial k-space sampling is increased scan time. Conclusion: After reviewing literature of 42 studies, it was assessed that the use of radial K-space sampling technique or propeller sequence adjacent to the standard MRI sequences can reduce the motion artifact and will increase the image quality.