Terrell rotation by Ciro Santilli 35 Updated +Created
What you would see the moving rod look like on a photo of a length contraction experiment, as opposed as using two locally measured separate spacetime events to measure its length.
Great doubt by Ciro Santilli 35 Updated +Created
The type of feeling of confusion and distrut for your sense that some Koans attempt to instill.
Ciro Santilli's preferred version of it is physics and the illusion of life.
Some notable references:
JavaScript is single threaded by Ciro Santilli 35 Updated +Created
Universal Module Definition by Ciro Santilli 35 Updated +Created
Since JavaScript devs are incapable of defining an unified import standard, this design pattern emerged where you just check every magic global one by one. Here's a demo where a Js library works on both the browser and from Node.js:
Animal by Ciro Santilli 35 Updated +Created
Mineral (nutrient) by Ciro Santilli 35 Updated +Created
DNA methylation by Ciro Santilli 35 Updated +Created
The first found and most important known epigenetic marker.
Happens only on adenine and cytosine. Adenine methylation is much less common in mammal than cytosine methylation, when people say "methylation" they often mean just cytosine methylation.
It often happens on promoters, where it inhibits transcription.
Disk encryption by Ciro Santilli 35 Updated +Created
GNU Taler by Ciro Santilli 35 Updated +Created
Centralized system that still attempts some level of privacy.
In it, a central bank issue tokens that are stored offline in your cell phone, a bit like cash bank notes.
When you take those tokens, a corresponding amount gets removed from your bank account, a bit like cash bank notes.
When a transaction is made, tokens are put into a spent token list via central API, and cannot be double spent thereafter. The corresponding ammount is then added to the bank account of the receiver. This also means that offline transactions are not possible.
When emitting, the bank signs the token with their private key. When spending, the bank checks that signature.
How do we prevent the bank from logging which token goes to which user besides trusting that they are running the software we whink they are running? Notably, couldn't timing be used to identify that?
Four-current by Ciro Santilli 35 Updated +Created
Crankstart Foundation by Ciro Santilli 35 Updated +Created
At crankstart.org/grants the organization's website describes mostly California activities, but they do at least also act in the University of Oxford, see: Section "University of Oxford study costs".
Presumably the name refers to crank starting an old car, as in helping out those in difficulty like poor students get started in life. But is also an obscure slang for a type of handjob according to Urban Dictionary.
GHDL by Ciro Santilli 35 Updated +Created
Examples under vhdl.
First install GHDL. On Ubuntu:
sudo apt install verilator
Tested on Verilator 1.0.0, Ubuntu 22.04.
Run all examples, which have assertions in them:
cd vhdl
./run
Files:
Verilator by Ciro Santilli 35 Updated +Created
Verilog simulator that transpiles to C++.
One very good thing about this is that it makes it easy to create test cases directly in C++. You just supply inputs and clock the simulation directly in a C++ loop, then read outputs and assert them with assert(). And you can inspect variables by printing them or with GDB. This is infinitely more convenient than doing these IO-type tasks in Verilog itself.
Some simulation examples under verilog.
First install Verilator. On Ubuntu:
sudo apt install verilator
Tested on Verilator 4.038, Ubuntu 22.04.
Run all examples, which have assertions in them:
cd verilator
make run
File structure is for example:
Example list:
Ultra-high vacuum by Ciro Santilli 35 Updated +Created
American university by Ciro Santilli 35 Updated +Created
Alpha decay by Ciro Santilli 35 Updated +Created
Most of the helium in the Earth's atmosphere comes from alpha decay, since helium is lighter than air and naturally escapes out out of the atmosphere.
Wiki mentions that alpha decay is well modelled as a quantum tunnelling event, see also Geiger-Nuttall law.
As a result of that law, alpha particles have relatively little energy variation around 5 MeV or a speed of about 5% of the speed of light for any element, because the energy is inversely exponentially proportional to half-life. This is because:
  • if the energy is much larger, decay is very fast and we don't have time to study the isotope
  • if the energy is much smaller, decay is very rare and we don't have enough events to observe at all
Video 1. Source.
Glycoprotein by Ciro Santilli 35 Updated +Created

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