Skip to content

Instantly share code, notes, and snippets.

View clumma's full-sized avatar

Carl Lumma clumma

21 followers · 36 following
View GitHub Profile
@clumma
clumma / loopz.js
Last active January 9, 2017 07:42
Don't write loops?
var range = function(min, max) {
arr = [];
for (var i = min; i <= max; i++) {
arr.push(i);
}
return arr;
}
var fbMod = function(n) {
var msg = '';
var result = new Array(n);
@clumma
clumma / FissionStartups.md
Last active February 26, 2017 04:22
Fission startups
name city nation
reactor size (MWe)
 reactor type gee-whiz
Oklo Sunnyvale, CA USA 2 SFR * heat pipes
Dunedin Energy Systems ? Canada 6 LWR cermet fuel
Gen4 Energy Denver, CO USA 25 LFR *
Seaborg Copenhagen DK 25 MSR
StarCore Nuclear Montreal, QC Canada 30 HTGR
NuScale Power (Fluor) Portland, OR USA 50 LWR
X-energy Greenbelt, MD USA 50 HTGR
Kairos Power Oakland, CA USA 100 FHR natgas
@clumma
clumma / TreeOfLife.md
Last active March 13, 2018 00:42
Tree of Life
  • Prokaryotes (no nucleus, unicellular)
    • Archaea (often extremophiles)
    • Bacteria
      • Cyanobacteria (have chlorophyll, e.g. spirulina)
      • Spirochetes (cause syphilis & Lyme disease)
  • Eukaryotes
    • Protozoa/Protists (unicellular)
      • Alveolates (phylum; cause malaria, toxoplasmosis)
        • Paramecium (cilia-bearing genus)
  • Giardia, Cryptosporidium (diarrhea-causing genera)
@clumma
clumma / pH.md
Last active January 17, 2018 07:44
Calculating the pH of a solution

Hydrochloric acid

What the heck is "20° Baume muriatic acid"? Google to the rescue

It means that 100g of solution contains 31.45g HCl

Your HCl is very near to 10 mol/l or 36.5g/100ml

Strong acids dissociate completely, so pH is just the -log of the concentration (in moles/liter, called the molarity or M)

@clumma
clumma / good-js.md
Created March 12, 2018 19:40
JS libraries
@clumma
clumma / places.md
Last active August 19, 2018 00:19
Kensington El Cerrito Los Gatos
Square miles 1 4 11
People 5,000 25,000 30,000
@clumma
clumma / apollo.md
Last active October 31, 2022 00:34
Letters to my Sons on the 50th Anniversary of Apollo 11

Starting today, I'm going to send a series of e-mails about the Apollo project. Each e-mail will include some interesting facts and maybe a question. So watch out for questions marks. I want to read your answers!

Basic Info

The Apollo project ran from 1961 to 1972. I was born in 1977.

The Saturn V rocket is the most famous vehicle made during the Apollo project. It flew just one mission after Apollo was cancelled – it launched Skylab in 1973

https://en.wikipedia.org/wiki/Skylab

@clumma
clumma / cerebellum.txt
Last active March 27, 2019 17:14
2017-09-18
d4 0.11
Nf6
c4
e6
Nf3
d5 Nc3
c6 e3 Nbd7 Qc2 Bd6 Bd3 O-O O-O dxc4 Bxc4 a6 Rd1 b5 Bd3 | 0.11 Semi-Slav
Bb4 cxd5 exd5 Bg5 h6 Bh4 Bf5 | 0.14 Ragozin
@clumma
clumma / GoldenEras.md
Last active July 17, 2023 16:53
Golden Eras

Ages of Growth

Notable 'golden eras' may be caused by contact with steep energy gradients that are eventually depleted.[1] The Dutch golden age, which gave us Huygens, Sweelinck, and Vermeer, was powered by wind and peat. The Victorian era, which gave us Bosanquet among many others, coal.[2] Postwar business cycles are closely associated with changes in the price of oil.[3]

The average YoY growth rate of world oil production 1974-2013 was 1%. Minimum 1961-1973 was 5% (average was 7%).[4]

[1a] http://lumma.org/econ/AgesOfGrowth.html
[1b] https://gist.github.com/clumma/214831723c7d567cc343cc07672737a2
[2a] https://books.google.com/books?id=oQdZAAAAYAAJ
[2b] https://gist.github.com/clumma/2ffed4289963dec56d39

@clumma
clumma / Shrinkage.md
Last active November 8, 2023 23:35
Returns to Scale vs Experience

Returns to Scale vs Experience

How many wristwatches are cheaper than Big Ben?

Abstract

Big machines are sometimes more efficient. But they cost more, so fewer can be produced with a finite budget. Small machines are cheaper and may benefit from improvement over time, driven by experience in building more units. When does this experience lead to greater overall efficiency? We derive an approximation which, given a learning rate, tells how much smaller a machine must be to overcome an initial efficiency disadvantage.

Background

Learning curves were characterized in the context of industrial production in the 1930s by Wright.[^1] The production cost of a machine follows a power law in the number of units made so far