Class information for:
Level 1: OPTICAL FREQUENCY STANDARD//ATOMIC CLOCKS//LNE SYRTE

Basic class information
Bar chart of Publication_year

Last years might be incomplete

Hierarchy of classes
The table includes all classes above and classes immediately below the current class.


Cluster id Level Cluster label #P
13 4 PHYSICS, PARTICLES & FIELDS//PHYSICS, NUCLEAR//OPTICS 1062565
141 3       PHYSICAL REVIEW A//OPTICS//PHYSICS, ATOMIC, MOLECULAR & CHEMICAL 66180
1640 2             TIME FREQUENCY//ATOMIC CLOCKS//FREQUENCY STANDARD 7221
6022 1                   OPTICAL FREQUENCY STANDARD//ATOMIC CLOCKS//LNE SYRTE 1572

Terms with highest relevance score


rank Category termType chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 OPTICAL FREQUENCY STANDARD authKW 362955 2% 46% 39
2 ATOMIC CLOCKS authKW 345350 4% 31% 56
3 LNE SYRTE address 343745 3% 35% 49
4 OPTICAL CLOCK authKW 265698 2% 51% 26
5 OPTICAL LATTICE CLOCK authKW 261948 1% 93% 14
6 OPTICAL ATOMIC CLOCKS authKW 240566 1% 100% 12
7 ATOMIC FOUNTAIN authKW 218285 1% 78% 14
8 INNOVAT SPACE TIME PROJECT address 199286 1% 76% 13
9 TIME FREQUENCY address 175345 4% 14% 64
10 METROL ESSAIS SYST REFERENCES TEMPS ES address 167056 1% 83% 10

Web of Science journal categories


chi_square_rank Category chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 Optics 19799 47% 0% 734
2 Physics, Atomic, Molecular & Chemical 5487 24% 0% 375
3 Physics, Multidisciplinary 4792 26% 0% 410
4 Instruments & Instrumentation 2519 13% 0% 208
5 Physics, Applied 1429 22% 0% 339
6 Acoustics 522 4% 0% 59
7 Engineering, Electrical & Electronic 428 12% 0% 191
8 Engineering, General 16 1% 0% 21
9 Astronomy & Astrophysics 3 2% 0% 33
10 Engineering, Aerospace 1 0% 0% 5

Address terms


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 LNE SYRTE 343745 3% 35% 49
2 INNOVAT SPACE TIME PROJECT 199286 1% 76% 13
3 TIME FREQUENCY 175345 4% 14% 64
4 METROL ESSAIS SYST REFERENCES TEMPS ES 167056 1% 83% 10
5 METROL TIME SPACE 125287 1% 63% 10
6 ATOM FREQUENCY STAND 111963 1% 31% 18
7 OBSERV PARISUMR 8630 80189 0% 100% 4
8 JOINT MEASUREMENT SCI 69291 1% 31% 11
9 QUANTENOPT 54382 2% 8% 33
10 LPTF 53448 1% 33% 8

Journals


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 METROLOGIA 32634 4% 2% 68
2 PHYSICAL REVIEW A 21594 17% 0% 271
3 IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 12263 4% 1% 59
4 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 10392 4% 1% 69
5 APPLIED PHYSICS B-LASERS AND OPTICS 8959 4% 1% 59
6 PHYSICAL REVIEW LETTERS 5319 10% 0% 162
7 OPTICS LETTERS 5048 6% 0% 88
8 NATURE PHOTONICS 3509 1% 1% 14
9 CHINESE PHYSICS LETTERS 3091 3% 0% 49
10 EUROPEAN PHYSICAL JOURNAL D 2992 2% 1% 29

Author Key Words


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass LCSH search Wikipedia search
1 OPTICAL FREQUENCY STANDARD 362955 2% 46% 39 Search OPTICAL+FREQUENCY+STANDARD Search OPTICAL+FREQUENCY+STANDARD
2 ATOMIC CLOCKS 345350 4% 31% 56 Search ATOMIC+CLOCKS Search ATOMIC+CLOCKS
3 OPTICAL CLOCK 265698 2% 51% 26 Search OPTICAL+CLOCK Search OPTICAL+CLOCK
4 OPTICAL LATTICE CLOCK 261948 1% 93% 14 Search OPTICAL+LATTICE+CLOCK Search OPTICAL+LATTICE+CLOCK
5 OPTICAL ATOMIC CLOCKS 240566 1% 100% 12 Search OPTICAL+ATOMIC+CLOCKS Search OPTICAL+ATOMIC+CLOCKS
6 ATOMIC FOUNTAIN 218285 1% 78% 14 Search ATOMIC+FOUNTAIN Search ATOMIC+FOUNTAIN
7 FREQUENCY TRANSFER 142681 1% 65% 11 Search FREQUENCY+TRANSFER Search FREQUENCY+TRANSFER
8 FREQUENCY STANDARD 126857 2% 26% 24 Search FREQUENCY+STANDARD Search FREQUENCY+STANDARD
9 LASER COOLING 100404 3% 11% 45 Search LASER+COOLING Search LASER+COOLING
10 ATOMIC FOUNTAIN CLOCK 100236 0% 100% 5 Search ATOMIC+FOUNTAIN+CLOCK Search ATOMIC+FOUNTAIN+CLOCK

Core articles
The table includes core articles in the class. The following variables is taken into account for the relevance score of an article in a cluster c:
(1) Number of references referring to publications in the class.
(2) Share of total number of active references referring to publications in the class.
(3) Age of the article. New articles get higher score than old articles.
(4) Citation rate, normalized to year.

Classes with closest relation at Level 1


rank cluster_id2 link
1 24067 CESIUM BEAM FREQUENCY STANDARD//HORLOGE ATOM//ACCURACY OF FREQUENCY STANDARD
2 19056 MEASUREMENT RUMENT//METROLOGIA//TIME TRANSFER
3 5806 FREQUENCY COMB//OPTICAL FREQUENCY COMB//OPTICAL FREQUENCY METROLOGY
4 12957 FINE STRUCTURE CONSTANT//FUNDAMENTAL COUPLINGS//VARIATION OF FUNDAMENTAL CONSTANTS
5 7678 NONACCELERATOR PARTICLE PHYS GRP//NON ACCELERATOR PARTICLE PHYS GRP//FRANCIUM
6 10579 ATOM INTERFEROMETRY//ATOM INTERFEROMETER//VCQ
7 2885 TRAPPED IONS//TIME FREQUENCY//ION TRAP
8 2806 ATOM LITHOGRAPHY//LASER COOLING//MAGNETO OPTICAL TRAP
9 22073 SPIN ORBIT COUPLED SYSTEM//COLOR SELECTIVE MOTT TRANSITION//COLOR SUPERFLUID
10 10306 FREQUENCY STABILIZATION//SATURATED ABSORPTION SPECTROSCOPY//EXTERNAL CAVITY DIODE LASER

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