Class information for:
Level 1: CESIUM BEAM FREQUENCY STANDARD//HORLOGE ATOM//ACCURACY OF FREQUENCY STANDARD

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
24067 1                   CESIUM BEAM FREQUENCY STANDARD//HORLOGE ATOM//ACCURACY OF FREQUENCY STANDARD 348

Terms with highest relevance score


rank Category termType chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 CESIUM BEAM FREQUENCY STANDARD authKW 543389 2% 100% 6
2 HORLOGE ATOM address 221875 2% 35% 7
3 ACCURACY OF FREQUENCY STANDARD authKW 181130 1% 100% 2
4 H MASER authKW 181130 1% 100% 2
5 POLARIZED ATOMIC BEAM authKW 181130 1% 100% 2
6 CESIUM ATOMIC CLOCK authKW 120752 1% 67% 2
7 CESIUM BEAM authKW 120752 1% 67% 2
8 RAMSEY CAVITY authKW 120752 1% 67% 2
9 ATOMIC FREQUENCY STANDARD authKW 116437 1% 43% 3
10 QUANTUM INFORMAT MEASUREMENT address 113199 1% 25% 5

Web of Science journal categories


chi_square_rank Category chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 Instruments & Instrumentation 4153 34% 0% 120
2 Engineering, Electrical & Electronic 1109 34% 0% 119
3 Physics, Applied 524 27% 0% 93
4 Optics 489 17% 0% 58
5 Acoustics 466 7% 0% 25
6 Physics, Multidisciplinary 322 15% 0% 53
7 Spectroscopy 154 6% 0% 22
8 Engineering, General 73 4% 0% 14
9 Engineering, Aerospace 65 2% 0% 8
10 Physics, Atomic, Molecular & Chemical 65 7% 0% 23

Address terms


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 HORLOGE ATOM 221875 2% 35% 7
2 QUANTUM INFORMAT MEASUREMENT 113199 1% 25% 5
3 DOE PROJECT EARCHING MEASUREMENTS COMMUN 90565 0% 100% 1
4 MEASUREMENTS POWER SYST 90565 0% 100% 1
5 QUANTUM INFORMAT MEASUREMENT MOE 90565 0% 100% 1
6 TIME SERVER 90565 0% 100% 1
7 TIME UNIT SECT 90565 0% 100% 1
8 COMPUTAT ELECT PHYS 90563 1% 50% 2
9 BNM PRIMAIRE TEMPS FREQUENCES 45281 0% 50% 1
10 MAGNETISM MAGNET MATMINIST EDUC 45281 0% 50% 1

Journals


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 33493 17% 1% 58
2 PTB-MITTEILUNGEN 32913 3% 4% 10
3 METROLOGIA 32718 9% 1% 32
4 IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 9992 7% 0% 25
5 OPTIKA I SPEKTROSKOPIYA 5277 6% 0% 20
6 JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS 4305 1% 1% 4
7 PROCEEDINGS OF THE IEEE 3495 4% 0% 13
8 MEASUREMENT TECHNIQUES 2138 2% 0% 7
9 ANNALES DE PHYSIQUE 1814 1% 0% 5
10 PROGRESS IN QUANTUM ELECTRONICS 1585 1% 1% 2

Author Key Words


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass LCSH search Wikipedia search
1 CESIUM BEAM FREQUENCY STANDARD 543389 2% 100% 6 Search CESIUM+BEAM+FREQUENCY+STANDARD Search CESIUM+BEAM+FREQUENCY+STANDARD
2 ACCURACY OF FREQUENCY STANDARD 181130 1% 100% 2 Search ACCURACY+OF+FREQUENCY+STANDARD Search ACCURACY+OF+FREQUENCY+STANDARD
3 H MASER 181130 1% 100% 2 Search H+MASER Search H+MASER
4 POLARIZED ATOMIC BEAM 181130 1% 100% 2 Search POLARIZED+ATOMIC+BEAM Search POLARIZED+ATOMIC+BEAM
5 CESIUM ATOMIC CLOCK 120752 1% 67% 2 Search CESIUM+ATOMIC+CLOCK Search CESIUM+ATOMIC+CLOCK
6 CESIUM BEAM 120752 1% 67% 2 Search CESIUM+BEAM Search CESIUM+BEAM
7 RAMSEY CAVITY 120752 1% 67% 2 Search RAMSEY+CAVITY Search RAMSEY+CAVITY
8 ATOMIC FREQUENCY STANDARD 116437 1% 43% 3 Search ATOMIC+FREQUENCY+STANDARD Search ATOMIC+FREQUENCY+STANDARD
9 AC ZEEMAN SHIFT 90565 0% 100% 1 Search AC+ZEEMAN+SHIFT Search AC+ZEEMAN+SHIFT
10 ATOMIC BEAM CLOCK 90565 0% 100% 1 Search ATOMIC+BEAM+CLOCK Search ATOMIC+BEAM+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 6022 OPTICAL FREQUENCY STANDARD//ATOMIC CLOCKS//LNE SYRTE
2 19056 MEASUREMENT RUMENT//METROLOGIA//TIME TRANSFER
3 26864 DIFFUSION TECHNOLOGY//ACL BECL2 SYSTEMS//CERNOBYL
4 10306 FREQUENCY STABILIZATION//SATURATED ABSORPTION SPECTROSCOPY//EXTERNAL CAVITY DIODE LASER
5 2806 ATOM LITHOGRAPHY//LASER COOLING//MAGNETO OPTICAL TRAP
6 7066 ATOMIC MAGNETOMETER//COHERENT POPULATION TRAPPING//ATOMIC CLOCKS
7 15471 ARC EXCELLENCE ENGN QUANTUM SYST//DIELECTRIC RESONATORS//FREQUENCY STAND METROL GRP
8 17489 SIBERIAN SNAKES//POLARIZED BEAMS//SPIN PHYS
9 38414 SODERBERG ANODE//COKE DRUM//ALCOA PRIMARY MET
10 29331 MONO COMPONENT//BEDROSIAN IDENTITY//RATIONAL ORTHOGONAL SYSTEM

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