Nandini Das - Academia.edu (original) (raw)
Uploads
Papers by Nandini Das
Software Quality Professional Magazine, Dec 1, 2003
[This abstract is based on the author's abstract.] Control charts based on Poisson distributi... more [This abstract is based on the author's abstract.] Control charts based on Poisson distribution may not be appropriate for monitoring the number of defects. In such cases, the negative binomial is a viable alternative. Quality control personnel in an In..
Journal of Physics and Chemistry of Solids, 2009
Alumina membrane filters in the form of thin (0.3-0.8 mm) discs of 25-30 mm diameter suitable for... more Alumina membrane filters in the form of thin (0.3-0.8 mm) discs of 25-30 mm diameter suitable for microfiltration application have been fabricated by tape-casting technique. Further using this microfiltration membrane as substrate, boehmite sol coating was applied on it and ultrafiltration membrane with very small thickness was formed. The pore size of the microfiltration membrane could be varied in the range of 0.1-0.7 mm through optimisation of experimental parameter. In addition, each membrane shows a very narrow pore size distribution. The most important factor, which determines the pore size of the membrane, is the initial particle size and its distribution of the ceramic powder. The top thin ultrafiltration, boehmite layer was prepared by sol-gel method, with a thickness of 0.5 mm. Particle size of the sol was approximately 30-40 nm. The structure and formation of the layer was analysed through TEM. At 550 1C formation of the top layer was completed. The pore size of the ultrafiltration membrane measured from TEM micrograph was almost 10 nm. Results of microbial (Escherichia coli-smallest-sized water-borne bacteria) test confirm the possibility of separation through this membrane
Software Quality Professional Magazine, Dec 1, 2003
[This abstract is based on the author's abstract.] Control charts based on Poisson distributi... more [This abstract is based on the author's abstract.] Control charts based on Poisson distribution may not be appropriate for monitoring the number of defects. In such cases, the negative binomial is a viable alternative. Quality control personnel in an In..
Journal of Physics and Chemistry of Solids, 2009
Alumina membrane filters in the form of thin (0.3-0.8 mm) discs of 25-30 mm diameter suitable for... more Alumina membrane filters in the form of thin (0.3-0.8 mm) discs of 25-30 mm diameter suitable for microfiltration application have been fabricated by tape-casting technique. Further using this microfiltration membrane as substrate, boehmite sol coating was applied on it and ultrafiltration membrane with very small thickness was formed. The pore size of the microfiltration membrane could be varied in the range of 0.1-0.7 mm through optimisation of experimental parameter. In addition, each membrane shows a very narrow pore size distribution. The most important factor, which determines the pore size of the membrane, is the initial particle size and its distribution of the ceramic powder. The top thin ultrafiltration, boehmite layer was prepared by sol-gel method, with a thickness of 0.5 mm. Particle size of the sol was approximately 30-40 nm. The structure and formation of the layer was analysed through TEM. At 550 1C formation of the top layer was completed. The pore size of the ultrafiltration membrane measured from TEM micrograph was almost 10 nm. Results of microbial (Escherichia coli-smallest-sized water-borne bacteria) test confirm the possibility of separation through this membrane