Erik Koene
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Thinking out loud...


A Swiss recipe for making quark at home

Posted on March 27, 2021

Introduction Quark is a popular dairy product. It could be seen as a thicker, more protein-rich and more sour version of yoghurt. In practice, it... [Read More]
Tags: quark cooking dairy

Six introductions to the finite-difference method

Posted on March 15, 2021

Introduction Finite-difference (FD) methods are ways to approximate a function or its derivatives at a given point, by computing a weighted sum of some input... [Read More]
Tags: finite-difference FDM algorithms

Time-reverse imaging without the mystery

Posted on March 9, 2021

There are two standard modern imaging methods in (exploration) seismology: reverse-time migration (RTM) and full-waveform inversion (FWI). Both of these methods rest on the need... [Read More]
Tags: full waveform inversion FWI reverse time migration RTM geophysics algorithms

On the innocence of fantasy

Posted on February 19, 2021

From our youngest ages, we spend vast amounts of time mentally immersing ourselves in fantasy worlds – in the form of daydreaming, reading, TV series,... [Read More]
Tags: fantasy morality

On things being good, and also bad

Posted on February 1, 2021

Societies are made up of things that are simultaneously good and bad. I don’t mean that in the sense of different tastes, like how some... [Read More]
Tags: politics society
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Erik Koene  •  2026