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Made in Japan

Made in Japan

Japan – the island nation is famous for many things. The first developed country in Asia despite adverse geographical conditions, the oldest empire existing on earth, the land of rising sun, Japanese tea ceremony Sado, Sushi the national dish, the great Samurai warriors, the gigantic Sumo wrestlers and above  all “Made in Japan” robots. Its technology had made it an iconic nation.

I was amazed to see many marvels of science and technology during my recent visit to Tokyo Science Center. What impressed me most was apart from being a research and training center for healthcare professionals it offers many novel modes of training like using realistic organ models for endoscopic surgery and cardiovascular disease treatment in an effort to introduce its cutting edge medical devices and technological advancement to the whole world enabling the healthcare professionals to enhance their knowledge and skills in treating patients across the globe for unmet medical needs making it a modern day monastery of wisdom.

I really appreciate Japan’s technological prowess and its noble contribution to humanity by inventing novel machines for betterment of society and well-being of humanity. It was tough for me to say sayonara while departing from Tokyo.

-       Freeman Dyson


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Dissolution - Theory and concepts

Theory of Dissolution

 Dissolution is the process by which a solid enters into solution.
 In 1897 Noyes and Whitney came up with: “The rate of solution of
solid substances in their own solution.”
 dc / dt = K (Cs-Ct)
 According to their research, rate of dissolution of solid substances is determined by rate of diffusion of a very thin layer of saturated solution that forms instantaneously around the solid particle. They developed the mathematical relationship that correlates the dissolution rate to the solubility gradient of the solid.

Diffusion layer model / film theory

 In 1904, Nerst and Brunner applied Fick’s law of diffusion to the
Noyes-Whitney equation. (Diffusion layer model / film theory)
 dc / dt = K D.S / v.h (Cs-Ct)

Cube root law of dissolution

 In 1931, Hixson and Crowell came up with Cube root law of
 W01/3-W1/3 = Kt

Scheme of dissolution

Later Wagner followed by Carstensen gave the scheme of dissolution.
 Initial mechanical lag
 Wetting of the …