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Linguistics

No idea what these are:

• Montague grammar
  • Universal grammar?
• Generative grammar
• Categorial grammar
• Some terms:
  • Noun phrase
  • Determiner
  • Common noun
  • Relative clause
  • Transitive verb

Chemistry

• Moles: Avogadro number (6.623*10²³) of molecules of a substance.
• Ion: Atom/molecule with a net electrical charge
• Anion: Negatively charged ion
  • Has more electrons than protons
• Cation: Positively charged ion

Molarity

A measure of concentration.

Number of moles of solute per litre of solvent.

Chirality

Chiral molecules are symmetric.

Electron orbitals

• σ-bond
• π-bond

Radioactivity

• Gray (gy): SI unit of ionizing radiation dose
  • Absorbed dose of radiation ʷ
  • Absorption of 1J of radiation energy per kg of matter.
  • 'measure of the energy deposited in matter by ionizing radiation per unit mass' ʷ
• Becquerel (Bq): SI unit of radiactivity
  • 1Bq => one nucleus decays per second
  • 1Bq = 1 per second = 1s⁻¹

Geneology

• Ahnentafel (German for 'ancestor table'): A chart of descent of a person from ancestors
• Pedigree chart: Family tree
• Proband: Subject being studied/probed.

Geneology chart symbols (probaby differs):

Square	Male
Circle	Female
Diamond	Unknown gender
Diagonal from top-right	Deceased

Source: https://www.genome.gov/Pages/Education/Modules/YourFamilyHealthHistory.pdf

Identical twins:

   𐌡
  /-\
 /   \
□     □

Biology

• mtDNA: mitochondrial DNA
• Mitochondria: 'Powerhouse of the cell'

Civil engineering

Brick grades

• There are different grades of bricks.
• Depending on the amount of load it can withstand.
• Called 'classes' of bricks.

Electrical engineering

• Active and passive filters
• Ideal and real filters

Passive low pass filter

Allow signals of 0Hz to cut-off frequency to pass. ¹

    +-----R1-----+
    |     1k     |   ---+
   +|            |      |
Vin ∿            C1     Vout
   -|            |      |
    |            |   ---+
    +------+-----+
           ⏚ Ground

Example values:

Vin is AC voltage SINE(0 10 1K)

• Amplitude of V1 = 10
• C1 = 10μ
• R1 = 1000Ω

Graphs of some (ideal) filters:

Low-pass           High-pass          Band-pass          Band-stop

A                  A                  A                  A                          
∧                  ∧                  ∧                  ∧                      
|                  |                  |                  |                      
|----+             |    +------       |   +---+          |----+   +----               
| P  |  S          | S  |  P          | S | P | S        | P  | S | P           
| a  |  t          | t  |  a          | t | a | t        | a  | t | a       
| s  |  o          | o  |  s          | o | s | o        | s  | o | s       
| s  |  p          | p  |  s          | p | s | p        | s  | p | s
+----------> ν     +----------> ν     +----------> ν     +--------------> ν
0    fc            0    fc            0   fl  fh     0   0    fl  fh

History

• A guess:
  • Gregarian calendar = 825 + കൊല്ലവര്‍ഷം

Printing and typesetting

• Kerning: Override space between specific pairs of characters ʳ
• Letter spacing: Space between all pairs of characters ʳ