Postings tagged with 'Quantum Physics', listed in descending order by creation date.

Blog Postings on Physics

(elkement. Last changed: 2015-11-07. Created: 2015-02-04. Tags: Physics, Thermodynamics, Quantum Physics, Quantum Field Theory, History Of Science. German Version.)

Today I am writing articles on physics mainly on my English (elkement's) blog and our German (punktwissen) blog. This site (and its precursor, radices.net) help me with curating the links to my English physics postings.

All English postings written to date are displayed below, in decending order, from the Physics category's feed on my blog.

While I gravitated against quantum theory and the connection between physics and philosophy in 2012 and 2013, I finally switched to more hands-on applied physics in 2014. Before I have done 10-15 years of soul searching; some of these posts from 2012-2013 give prove of that.

'Physik - Urbanitzky', 1905

Heat Conduction Cheat Sheet (2018-09-24 12:17:06)
I am dumping some equations here I need now and then! The sections about 3-dimensional temperature waves summarize what is described at length in the second part of this post. Temperature waves are interesting for simulating yearly and daily oscillations …

Infinite Loop: Theory and Practice Revisited. (2018-06-10 11:56:55)
I’ve unlocked a new achievement as a blogger, or a new milestone as a life-form. As a dinosaur telling the same old stories over and over again. I started drafting a blog post, as I always do since a while: …

Can the Efficiency Be Greater Than One? (2018-04-09 11:40:59)
This is one of the perennial top search terms for this blog. Anticlimactic answer: Yes, because input and output are determined also by economics, not only by physics. Often readers search for the efficiency of a refrigerator. Its efficiency, the …

Consequences of the Second Law of Thermodynamics (2018-03-03 11:43:25)
Why a Carnot process using a Van der Waals gas – or other fluid with uncommon equation of state – also runs at Carnot’s efficiency. Textbooks often refer to an ideal gas when introducing Carnot’s cycle – it’s easy to calculate heat …

The Heat Source Paradox (2018-01-19 10:23:13)
It is not a paradox – it is a straight-forward relation between a heat pump system’s key data: The lower a heat pump’s performance factor is, the smaller the source can be built. I would not write this post, hadn’t …

Entropy and Dimensions (Following Landau and Lifshitz) (2017-11-24 10:00:18)
Some time ago I wrote about volumes of spheres in multi-dimensional phase space – as needed in integrals in statistical mechanics. The post was primarily about the curious fact that the ‘bulk of the volume’ of such spheres is contained …

The Collector Size Paradox (2017-11-01 15:11:56)
Recently I presented the usual update of our system’s and measurement data documentation.The PDF document contains consolidated numbers for each year and month of operations: It is finally time to tackle the fundamental questions: What is the impact of the …

Tinkering, Science, and (Not) Sharing It (2017-09-17 11:06:44)
I stumbled upon this research paper called PVC polyhedra: We describe how to construct a dodecahedron, tetrahedron, cube, and octahedron out of pvc pipes using standard fittings. … In particular, if we take a connector that takes three pipes each …

Heat Transport: What I Wrote So Far. (2017-07-14 09:15:49)
Don’t worry, The Subversive Elkement will publish the usual silly summer posting soon! Now am just tying up loose ends. In the next months I will keep writing about heat transport: Detailed simulations versus maverick’s rules of thumb, numerical solutions …

Spheres in a Space with Trillions of Dimensions (2017-06-17 19:55:10)
I don’t venture into speculative science writing – this is just about classical statistical mechanics; actually about a special mathematical aspect. It was one of the things I found particularly intriguing in my first encounters with statistical mechanics and thermodynamics …

You Never Know (2017-05-25 16:22:15)
… when obscure knowledge comes in handy! You can dismantle an old gutter without efforts, and without any special tools: Just by gently setting it into twisted motion, effectively applying ~1Hz torsion waves that would lead to fatigue break within …

Ploughing Through Theoretical Physics Textbooks Is Therapeutic (2017-05-07 11:16:21)
And finally science confirms it, in a sense. Again and again, I’ve harped on this pet theory of mine – on this blog and elsewhere on the web: At the peak of my immersion in the so-called corporate world, as …

Simulating Peak Ice (2017-05-02 08:43:17)
This year ice in the tank was finally melted between March 5 to March 10 – as ‘visual inspection’ showed. Level sensor Mr. Bubble was confused during the melting phase; thus it was an interesting exercise to compare simulations to …

Mr. Bubble Was Confused. A Cliffhanger. (2017-04-08 11:06:20)
This year we experienced a record-breaking January in Austria – the coldest since 30 years. Our heat pump system produced 14m3 of ice in the underground tank. The volume of ice is measured by Mr. Bubble, the winner of The …

Ice Storage Hierarchy of Needs (2017-02-22 17:30:10)
Data Kraken – the tentacled tangled pieces of software for data analysis – has a secret theoretical sibling, an older one: Before we built our heat source from a cellar, I developed numerical simulations of the future heat pump system. …

On Photovoltaic Generators and Scattering Cross Sections (2017-01-07 12:10:39)
Subtitle: Dimensional Analysis again. Our photovoltaic generator has about 5 kW rated ‘peak’ power – 18 panels with 265W each. Peak output power is obtained under so-called standard testing condition – 1 kWp (kilo Watt peak) is equivalent to: a panel …

Learning General Relativity (2016-12-03 18:54:45)
Math blogger Joseph Nebus does another A – Z series of posts, explaining technical terms in mathematics. He asked readers for their favorite pick of things to be covered in this series, and I came up with General Covariance. Which …

And Now for Something Completely Different: Rotation Heat Pump! (2016-11-03 09:55:35)
Heat pumps for space heating are all very similar: Refrigerant evaporates, pressure is increased by a scroll compressor, refrigerant condenses, pressure is reduced in an expansion value. *yawn* The question is: Can a compression heat pump be built in a …

Re-Visiting Carnot’s Theorem (2016-09-18 10:09:51)
The proof by contradiction used in physics textbooks is one of those arguments that appear surprising, then self-evident, then deceptive in its simplicity. You – or maybe only: I – cannot resist turning it over and over in your head …

Rowboats, Laser Pulses, and Heat Energy (Boring Title: Dimensional Analysis) (2016-03-01 11:25:33)
Dimensional analysis means to understand the essentials of a phenomenon in physics and to calculate characteristic numbers – without solving the underlying, often complex, differential equation. The theory of fluid dynamics is full of interesting dimensionless numbers –  Reynolds Number …

Temperature Waves and Geothermal Energy (2016-01-22 11:04:48)
Nearly all of renewable energy exploited today is, in a sense, solar energy. Photovoltaic cells convert solar radiation into electricity, solar thermal collectors heat hot water. Plants need solar power for photosynthesis, for ‘creating biomass’. The motion of water and …

Peter von Rittinger’s Steam Pump (AKA: The First Heat Pump) (2015-11-24 09:51:42)
Peter von Rittinger’s biography reads like a success story created by a Victorian novelist, and his invention was a text-book example of innovation triggered by scarcity ( Bio DE / EN). Born 1811, he was poor and became an orphan …

Heat Pump System Data: Three Seasons 2012 – 2015 (2015-09-29 17:23:33)
We have updated the documentation of monthly and seasonal measurement data – now including also the full season September 2014 to August 2015. The overall Seasonal Performance Factor was 4,4 – despite the slightly lower numbers in February and March, …

Lest We Forget the Pioneer: Ottokar Tumlirz and His Early Demo of the Coriolis Effect (2015-06-04 10:25:35)
Two years ago I wrote an article about The Myth of the Toilet Flush, comparing the angular rotation caused by the earth’s rotation to the typical rotation in experiments with garden hoses that make it easy to observe the Coriolis …

An Efficiency Greater Than 1? (2015-06-01 08:41:32)
No, my next project is not building a Perpetuum Mobile. Sometimes I mull upon definitions of performance indicators. It seems straight-forward that the efficiency of a wood log or oil burner is smaller than 1 – if combustion is not …

How to Evaluate a Heat Pump’s Performance? (2015-04-21 14:00:52)
The straight-forward way is to read off two energy values at the end of a period – day, month, or season: The electrical energy used by the heat pump and the heating energy delivered. The Seasonal Performance Factor (SPF) is …

Ice Storage Challenge: High Score! (2015-04-01 09:31:38)
Released from ice are brook and river By the quickening glance of the gracious Spring; The colors of hope to the valley cling, And weak old Winter himself must shiver, Withdrawn to the mountains, a crownless king. These are the …

“An Unprecedented Test for Europe’s Electricity System” (2015-02-27 15:56:31)
And we will not be able to contribute – by a hair. We have just ordered our photovoltaic generator, and installation is planned for April. It is the (partial) Solar Eclipse on March 20 that made Europe’s Transmission System Operators …

A Sublime Transition (2015-02-14 13:51:01)
Don’t expect anything philosophical or career-change-related. I am talking about water and its phase transition to ice because … …the fact that a process so common and important as water freezing is not fully resolved and understood, is astonishing. (Source) …

More Ice? Exploring Spacetime of Climate and Weather. (2015-01-28 14:58:07)
I have become obsessed with comparing climate data for different regions in the world and in different years (space + time). Finally I have found the tool I was looking for; now I can compare average Ice Days quickly – days …

Personal website of Elke Stangl, Zagersdorf, Austria, c/o punktwissen.
elkement [at] subversiv [dot] at.