Condensed matter university course Updated +Created
Multiplication Updated +Created
Resonance Updated +Created
Resonance is a really cool thing.
Examples:
Perhaps a key insight of resonance is that the reonant any lossy system tends to look like the resonance frequency quite quickly even if the initial condition is not the resonant condition itself, because everything that is not the resonant frequency interferes destructively and becomes noise. Some examples of that:
  • striking a bell or drum can be modelled by applying an impuse to the system
  • playing a pipe instrument comes down to blowing a piece that vibrates randomly, and then leads the pipe to vibrate mostly in the resonant frequency. Likely the same applies to bowed string instruments, the bow must be creating a random vibration.
  • playing a plucked string instrument comes down to initializing the system to an triangular wave form and then letting it evolve. TODO find a simulation of that!
Another cool aspect of resonance is that it was kind of the motivation for de Broglie hypothesis, as de Broglie was kind of thinking that electroncs might show discrete jumps on atomic spectra because of constructive interference.
Reverse transcriptase Updated +Created
Converts RNA to DNA, i.e. the inverse of transcription. Found in viruses such as Retrovirus, which includes e.g. HIV.
bsub Updated +Created
Submit a new job. The most important command!
HIV Updated +Created
Messenger RNA Updated +Created
Four-momentum Updated +Created
Square Updated +Created
Synchrotron Updated +Created
Most important application: produce X-rays for X-ray crystallography.
Note however that the big experiments at CERN, like the Large Hadron Collider, are also synchrotrons.
Sponsor Ciro Santilli's work on OurBigBook.com / Taxation Updated +Created
Ciro Santilli is a UK resident. He will register as a "solo trader" (slightly funny legal term) and treat donations that he uses for projects as grants, which pay regular income tax:The rates are given at: www.gov.uk/income-tax-rates and are as of writing:
  • 0 - £12,570 0%
  • £12,571 - £50,270: 20%
  • £50,271 - to £125,140: 40%
  • £125,140: 45%
National insurance is also likely going to be paid: www.gov.uk/self-employed-national-insurance-rates:
  • 6% on profits between £12,570 and £50,270
  • 2% on profits over £50,270
Fortunately however VAT does not need to be paid.
The amount that will be declared is the same as he grant amount that was requested, e.g. if 100k USD is requested for 1 year, then 100k USD will be pro-rata declared on that year.
Any remaining donations that don't yet meet specific grant goals will be initially treated as cash gifts which pay no tax. If in the future they are used as grant money after further goal amounts are reached, then they will taxed as grants.
Note however that if the donor is UK-based and dies within 7 years of the gift being given, inheritance tax has to be paid on them as per: www.gov.uk/inheritance-tax/gifts, at a maximum of 32% and going to to 0% at 7 years, so let me know from the afterlife.
Ciro's Edict #4 Updated +Created
Ciro's Edict #4 / Enable reference features into ourbigbook.com Updated +Created
Currently, none of the crucial cross file features like \x, \Include and table of contents are working. I was waiting until the above mentioned features were done, and now I'm going to get to that.
Camera obscura Updated +Created
Cartesian product Updated +Created
A function that maps two sets to a third set.
Galois theory Updated +Created

There are unlisted articles, also show them or only show them.