Stirling Cycle Machine Analysis
https://ohioopen.library.ohio.edu/opentextbooks/9/
#HackerNews #StirlingCycle #MachineAnalysis #EnergyEfficiency #Thermodynamics #Engineering #Innovation
The glider now has 12 pounds of lead shot and epoxy added to dead space in the very end of the tail boom.
My initial estimate of volume indicated that I could add 8 - 10 pounds this way. I'm pleasantly surprised, and I didn't make a chocolate covered mess of things as I was pouring this goop into the tail.
I need to add a few more pounds to the tail. Phase two of this project will use lead plate, bolted to the vertical fin spar. (I need to unroll the 1/4-inch plate first, then develop a template to cut the lead.)
I could not add the epoxy/lead shot mix all at once because of the exothermic reaction of epoxy. When mixed epoxy is in a thick blob (instead of a thin layer), it generates enough heat to warm itself...which accelerates the chemical reaction...releasing more heat...further accelerating the reaction.... I have seen epoxy smoking hot because of this, so I added a bit, waited a half hour, checked temperature with an IR non-contact thermometer, added a bit more when it was clear that the exotherm was only very mild, etc. That took a while, but turned out well.
I note that Roto Metals has a discount on some 1-inch lead plate. Get your fork lift ready. No free shipping!
https://www.rotometals.com/lead-sheet-plates/sheet-lead-1-64-lbs-sq-ft/
#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Ballast #Math #Density #Exothermic #Chemistry #Thermodynamics #Lead #Epoxy
4 media
devSJR :python: :rstats:
boosted
💧 In my geochemical research, I often go beyond pure PHREEQC and use the RedModRphree package in R.
It’s a powerful bridge between thermodynamic modeling and data analysis — allowing Pourbaix (Eh–pH) diagrams to be computed for complex, multicomponent systems with a focus on a specific element.
Here are examples of modeled speciation diagrams for vanadium, lead, and zinc, based on the same high mineralized water sample composition.
They clearly illustrate how each element behaves under changing redox and pH conditions — from soluble oxyanions to sparingly soluble solid phases.
#Geochemistry #Rstats #PHREEQC #DataScience #EnvironmentalChemistry #Hydrogeology #Redox #PourbaixDiagram #Thermodynamics #OpenScience #RedModRphree
3 media
💧 In my geochemical research, I often go beyond pure PHREEQC and use the RedModRphree package in R.
It’s a powerful bridge between thermodynamic modeling and data analysis — allowing Pourbaix (Eh–pH) diagrams to be computed for complex, multicomponent systems with a focus on a specific element.
Here are examples of modeled speciation diagrams for vanadium, lead, and zinc, based on the same high mineralized water sample composition.
They clearly illustrate how each element behaves under changing redox and pH conditions — from soluble oxyanions to sparingly soluble solid phases.
#Geochemistry #Rstats #PHREEQC #DataScience #EnvironmentalChemistry #Hydrogeology #Redox #PourbaixDiagram #Thermodynamics #OpenScience #RedModRphree
3 media
informapirata ⁂ :privacypride:
boosted
È divertentissimo leggere E.T. Jaynes, in particolare i suoi ultimi lavori. Questo passaggio è da "The Gibbs Paradox". Si può scaricare qui.
There is a school of thought which militantly rejects all attempts to point out the close relation between entropy and information, claiming that such considerations have nothing to do with energy; or even that they would make entropy subjective and it could therefore have nothing to do with experimental facts at all. We would observe, however, that the number of fish that you can catch is an objective experimental fact; yet it depends on how much subjective information you have about the behavior of fish.
Traduzione in italiano:
Esiste una corrente di pensiero che respinge con forza ogni tentativo di evidenziare la stretta relazione tra entropia e informazione, sostenendo che tali considerazioni non abbiano nulla a che fare con l’energia; o persino che renderebbero l’entropia soggettiva, e che quindi non potrebbe avere alcun legame con i fatti sperimentali. Osserviamo, tuttavia, che il numero di pesci che si possono catturare è un fatto sperimentale oggettivo; eppure dipende da quanta informazione soggettiva si possiede sul comportamento dei pesci.
#SecondLaw #SecondaLegge #Jaynes #Entropy #Fisica #Termodinamica #Thermodynamics
È divertentissimo leggere E.T. Jaynes, in particolare i suoi ultimi lavori. Questo passaggio è da "The Gibbs Paradox". Si può scaricare qui.
There is a school of thought which militantly rejects all attempts to point out the close relation between entropy and information, claiming that such considerations have nothing to do with energy; or even that they would make entropy subjective and it could therefore have nothing to do with experimental facts at all. We would observe, however, that the number of fish that you can catch is an objective experimental fact; yet it depends on how much subjective information you have about the behavior of fish.
Traduzione in italiano:
Esiste una corrente di pensiero che respinge con forza ogni tentativo di evidenziare la stretta relazione tra entropia e informazione, sostenendo che tali considerazioni non abbiano nulla a che fare con l’energia; o persino che renderebbero l’entropia soggettiva, e che quindi non potrebbe avere alcun legame con i fatti sperimentali. Osserviamo, tuttavia, che il numero di pesci che si possono catturare è un fatto sperimentale oggettivo; eppure dipende da quanta informazione soggettiva si possiede sul comportamento dei pesci.
#SecondLaw #SecondaLegge #Jaynes #Entropy #Fisica #Termodinamica #Thermodynamics