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{1511}  
 
{1481}  
How much energy is thermodynamically required to concentrate $CO_2$ from one liter of air? $CO_2$ concentration is 400ppm, or 0.4%. 1l of air is 1/22.4 or 44mMol. From wikipedia, the entropy of mixing is: $\Delta_{mix} S = n R (x_1 ln(x_1) + x_2 ln(x_2))$ where $x_1$ and $x_2$ are the fraction of air and $CO_2$ (0.996 and 0.004) This works out to $9.5e3 J/K$ . At STP, 300K, this means you need only about $2.9 J$ to extract the carbon dioxide. A car driving 1 km emits about 150g carbon dioxide. This is 3.4 moles, which will diffuse into 852 moles of air, or 19e3 liters of air (19 cubic meters). To pull this back out of the air then you'd need at minimum 55.3 kJ. This is not much at all  a car produces 100kW mechanical power, or 100kJ every second, and presumably it takes a minute to drive that 1km. But such perfectly efficient purification is not possible.  
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ref: 0
tags: entropy life proteonomics transcription factors
date: 07082011 22:42 gmt
revision:0
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Reduction in Structural Disorder and Functional Complexity in the Thermal Adaptation of Prokaryotes  read the article. These are my disordered, mesothermophylic notes.
 
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Conjecture: the entropic cost of simulating a system (complex evolved or not) in a system (e.g. machine) versus physical reality is proportional to the information content of original system * energy per bit of simulation * time to simulate / KL divergence between simulation and reality, where information content KL divergence are calculated within the space of measured dimensions. Am I missing terms? Or rather: what terms am I missing? :)  
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http://www.cs.rug.nl/~rudy/matlab/
 
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ref: bookmark0
tags: machine_learning classification entropy information
date: 002006 0:0
revision:0
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http://iridia.ulb.ac.be/~lazy/  Lazy Learning. 