Topic Models - Text Mining: Classification, Clustering, and Applications - page 86

1880
energy
molecules
atoms
molecular
matter

1900
energy
molecules
atoms
matter
atomic

1920
atom
atoms
energy
electrons
electron

1940
energy
rays
electron
atomic
atoms

1960
energy
electron
particles
electrons
nuclear

1980
energy
electron
particles
ion
electrons

2000
energy
state
quantum
electron
states

1890
molecules
energy
atoms
molecular
matter

1910
energy
theory
atoms
atom
molecules

1930
energy
electrons
atoms
atom
electron

1950
energy
particles
nuclear
electron
atomic

1970
energy
electron
particles
electrons
state

1990
energy
electron
state
atoms
states

"The Wave Properties
of Electrons" (1930)

"The Z Boson" (1990)

"Alchemy" (1891)

"Structure of the
Proton" (1974)

"Quantum Criticality:
Competing Ground States
in Low Dimensions" (2000)

"Nuclear Fission" (1940)

"Mass and Energy" (1907)

atomic

quantum

molecular

1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

1880
french
france
england
country
europe

1900
states
united
germany
country
france

1920
war
states
united
france
british

1940
war
states
united
american
international

1960
united
soviet
states
nuclear
international

1980
nuclear
soviet
weapons
states
united

2000
european
united
nuclear
states
countries

1890
england
france
states
country
europe

1910
states
united
country
germany
countries

1930
international
states
united
countries
american

1950
international
united
war
atomic
states

1970
nuclear
military
soviet
united
states

1990
soviet
nuclear
united
states
japan

"Science in the USSR" (1957)

"Farming and Food Supplies
in Time of War" (1915)

"Post-Cold War Nuclear
Dangers" (1995)

"The Atom and Humanity" (1945) "The Costs of the Soviet

Empire" (1985)

"Speed of Railway Trains
in Europe" (1889)

war

european

nuclear

1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

FIGURE 4.9 : Two topics from a dynamic topic model fit to the Science
archive (1880-2002).