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Burr Dimension Analysis on Various Materials for Convenantionally and CNC Drilled Holes

Kumar B. S., Vijayan V., Baskar N.

Mechanics and Mechanical Engineering

2016

Vol. 20, nr 3

347--354

This work reveals the burr dimensions at entry and exit of the drilled holes on copper, brass and stainless steel. Furthermore, the effect of spindle speed and feed rate on the burr dimensions are considered and reported. Burr size minimization is one of the key problems in drilling operation. The main aim of this research is evaluated the burr dimesion occurrences of drilling on conventionally drilled holes and CNC drilled holes. The burrs produced by conventional machine and CNC machine were compared and presented.

Synthesis and evaluation of novel mri contrast agents of chemically modified GD-DTPA complexes with sugars

Sugiyama M., Yamashita M., Yu G., Fujie M., Ogawa K., Ozaki N., Aoki T., Mizuno S., Okada S., Tachi K., Aoshima K., Sankar U. R., Kumar B. S., Takehara Y., Sakahara H.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

191-194

MRI is one of medical diagnostic imaging technologies that can draw the cross section in the body. To obtain a clearer image, Gd complexes are often used as MRI contrast agents. Gd-DTPA (Gd-Diethylenetriaminepentaacetate, Magnevist registered trademark ) is used in particular as the MRI contrast agents. We prepared and evaluated novel MRI contrast agents that were chemically modified Gd-DTPA with sugars (represented as Gd-DTPA-Sugar) via hydrolysis route for providing specificity to target organs and tissues. Gd-DTPASugar complex showed an excellent potential for the MRI contrast agent (r1=31.2 s-1mM-1). Gd-DTPA-Sugar complexes alternatively prepared by shorter synthetic route without protection/ deprotection (hydrolysis) method showed inferior results (r1=6.3 and 8.1 s-1mM-1) to the hydlized product.