Still 5 days to go, but maybe you want to start preparing the celebrations early? No? Well, that’s OK because there won’t be a party anyway. So what is the “World Metrology Day”? First of all, it is a day…
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Blog Archives
May 20 – World Metrology Day
Tagged with: daily life applications, International standards, International System of Units, Kilogram, Measurement, Metre, Metrology, SI base units, SI units, Standard, Systems of units, World Metrology Day
Posted in physics
Posted in physics
Moonwalk while a Russian spacecraft crash-landed
Neill Armstrong and Buzz Aldrin had already set foot on the Moon when at the same time Luna 15, an unmanned space mission of the Soviet Luna program, ignited its main booster and started to descent to the surface of…
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Tagged with: Apollo 11, Buzz Aldrin, Luna 15, Luna programme, Moon, Moon landing, Neill Armstrong, scientist, Spaceflight
Posted in physics
Posted in physics
Betting on future scientific output
Yesterday I was reading this article in “Physics Today” where the authors discuss about how to predict scientists’ future impact. What sounds like crystal ball gazing has been scientifically investigated over the last years. Having a reliable prediction about a…
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Tagged with: H-index, Physics Today, Prediction, professor, researcher, Science, scientist, young and talented researcher, young researcher
Posted in math, physics
Posted in math, physics
Debugging in the sleep
Yesterday I was trying to find a bug in my source code which lead to quite unexpected results. I thought that I narrowed down the possible origin and will be able to localize the problem within a short time. However,…
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Tagged with: dream, programming, sleeping, Software bugs, solution
Posted in computer, GPS, math, physics, programming
Posted in computer, GPS, math, physics, programming
Standard deviation of a standard deviation
The title of this post is maybe not correct in a mathematical sense, but I was asking myself if there exists an estimator for the “standard deviation of a standard deviation” or a kind of error bound for a sample…
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Tagged with: Data analysis, Errors and residuals in statistics, Estimator, mathematician, Normal distribution, Sample size determination, scientist, Standard deviation, Statistics, Uncertainty
Posted in math, paper, physics, programming
Posted in math, paper, physics, programming
The power of rain
It is raining since more than 24 hours in Tokyo. Nothing unusual for this time of the year, since we are close to the beginning of the raining season in Japan. This morning when I walked with my umbrella through…
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Tagged with: energy, Fukushima I power plant, Gravitation, Mass, Physics, potential energy, Precipitation, Rain, Tokyo, Watt
Posted in math, physics
Posted in math, physics
The shallow water equations in Octave
Playing with partial differential equations can be great fun. I guess the shallow water equations are one of the most easiest to understand system, which have a clearly visible impact in daily life. It does not matter if you have…
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Random walk and the central limit theorem
Random walk is the mathematical formalization of a path which consists of a succession of random steps. In the simplest (one-dimensional) case, the particle (or object of interest) propagates by a certain distance which is obtained from a random generator.…
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Tagged with: Central limit theorem, Normal distribution, Probability distribution, Random walk, simulation, Standard deviation, Statistical inference, Statistics, Stochastic processes
Posted in math, physics, programming
Posted in math, physics, programming
The pitch drop experiment
The pitch drop experiment is a long-term physics experiment which tries to measure the flow of bitumen over many years. Bitumen, also know as asphalt, appears to be kind of solid, but even at room temperature tar pitch flows at…
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Tagged with: Amorphous solids, Asphalt, Australia, Fluid, Fluid dynamics, John Mainstone, Physics, Pitch, Pitch drop experiment, Thomas Parnell, University of Queensland, Viscosity
Posted in physics
Posted in physics
Sequestration and what it means for space research
U.S. president Obama was required by law to issue a sequestration order which cancels about 85 billion USD in budgetary resources across the federal government for the remainder of the fiscal year 2013. Of course there are still plans to…
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