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Month: July 2019

Using Dirac Delta Formalism to Calculate Shear Force and Bending Moment

Using Dirac Delta Formalism to Calculate Shear Force and Bending Moment

Editor's note: This article was written by Valentin Fadeev, a physics PhD candidate in the UK. He also co-authored this article on equivalences and isomorphisms in category theory. You can find him on Twitter via the handle @ValFadeev. The delta function was introduced by P.A.M. Dirac, one of the founders of quantum electrodynamics. The delta…

Should I accept this shipment?

Should I accept this shipment?

Suppose you work for an engineering or manufacturing firm, and you receive shipments of different parts from various suppliers. It's not good business practice to just blindly accept a shipment, because some parts in your batch may be defective. Too many defective parts, and you'll slow down manufacturing (in addition to wasting valuable time and…

Energy Levels of Molecules are Bounded Below

Energy Levels of Molecules are Bounded Below

Editor's Note: This guest submission is from Nikita Lisitsa, a professional software developer and mathematician. You can follow him on Twitter. Are Molecules Perpetual Motion Machines? Short answer: no, of course not. Perpetual motion machines do not exist. There are deep theoretical reasons for that, as well as less deep but nevertheless convincing experimental data.…