The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Propellants used in rockets, pyrotechnics used in festivities, explosives used for military purposes, blasting chemicals used in construction activities, etc., are high energy materials. There is a lot of fascinating chemistry and interesting history behind them. This article gives an overview of these aspects, with somewhat more emphasis on propellants and working of rockets, and the chemistry of...
The article discusses the importance of the fine structure constant in quantum mechanics, along with the brief history of how it emerged. Although Sommerfelds idea of elliptical orbits has been replaced by wave mechanics, the fine structure constant he introduced has remained as an important parameter in the field of atomic structure.
A simple and inexpensive experimental setup for studying projectile motion using a low-cost projectile launcher and a microcontroller-based photogate timer is described. Using this setup, all three kinds of projectile motion (horizontal, oblique — ground to ground, and oblique — from a height) are studied.
“It is fair to say that, in general, no problems have been exhausted; instead, men have been exhausted by the problems. Soil that appears impoverished to one researcher reveals its fertility to another. Fresh talent approaching the analysis of a problem without prejudice will always see new possibilities — some aspect not considered by those who believe that a subject is fully understood. Our knowledge...
Phylogenetic Inference (PI) is a statistical technique to trace the evolutionary legacy of a wide range of subjects; including biological taxa (species), biomolecules, languages, ancient texts and so on. The first part1 of this tutorial introduced a number of fundamental concepts including phenetics, cladistics, homology, homoplasy, synapomorphy, symplesiomorphy, orthology and paralogy. In this part,...
The simplest problem in diffraction — light passing a straight edge — did not receive a rigorous solution till Sommerfeld’s work of 1896. The earlier theories, their successes and their limitations are recounted. They led upto Sommerfeld’s final solution which had eluded many great contemporaries. This solution was a landmark of rigorous diffraction theory.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.