Class information for:
Level 1: AVOGADRO CONSTANT//WATT BALANCE//KILOGRAM

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
26 4 ENGINEERING, ELECTRICAL & ELECTRONIC//ELECT ENGN//IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 322555
602 3       METROLOGIA//IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT//TRANSITION EDGE SENSOR 14519
1952 2             IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT//METROLOGIA//JOSEPHSON ARRAYS 6104
9394 1                   AVOGADRO CONSTANT//WATT BALANCE//KILOGRAM 1192

Terms with highest relevance score


rank Category termType chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 AVOGADRO CONSTANT authKW 1914904 7% 93% 78
2 WATT BALANCE authKW 1730863 6% 92% 71
3 KILOGRAM authKW 1697942 6% 94% 68
4 METROLOGIA journal 1258109 31% 13% 367
5 PLANCK CONSTANT authKW 798129 3% 75% 40
6 INTERNATIONAL SYSTEM OF UNITS authKW 376347 2% 65% 22
7 MASS STANDARDS authKW 371792 1% 94% 15
8 JOULE BALANCE authKW 330478 1% 83% 15
9 FUNDAMENTAL PHYSICAL CONSTANTS authKW 305920 2% 64% 18
10 SILICON SPHERE authKW 304817 1% 82% 14

Web of Science journal categories


chi_square_rank Category chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 Instruments & Instrumentation 55371 67% 0% 800
2 Physics, Applied 4547 40% 0% 482
3 Engineering, General 3258 13% 0% 155
4 Engineering, Electrical & Electronic 711 17% 0% 197
5 Physics, Multidisciplinary 531 11% 0% 133
6 Spectroscopy 244 5% 0% 54
7 Education, Scientific Disciplines 84 2% 0% 18
8 Chemistry, Analytical 56 5% 0% 54
9 Physics, Atomic, Molecular & Chemical 42 4% 0% 44
10 Physics, Nuclear 6 1% 0% 17

Address terms


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 IST METROL G COLONNETTI 109128 1% 24% 17
2 ELECT QUANTUM STAND 59486 0% 75% 3
3 NMIJ METROL J AN 52877 0% 100% 2
4 VNIIM 51810 1% 28% 7
5 DIPARTIMENTO FIS GEN A AVOGADRO 50975 1% 21% 9
6 MAT P M FOURT 35250 0% 67% 2
7 IST METROL GUSTAVO COLONNETTI 33989 0% 43% 3
8 METROL J AN 29575 3% 4% 30
9 ABSOLUTE PHYS QUANTITIES 26439 0% 100% 1
10 ARBEITSGRP 1 22 26439 0% 100% 1

Journals


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 METROLOGIA 1258109 31% 13% 367
2 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 94144 15% 2% 180
3 PTB-MITTEILUNGEN 55333 2% 9% 24
4 MEASUREMENT TECHNIQUES 15638 3% 2% 35
5 JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS 11308 1% 4% 12
6 MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA 9852 1% 3% 11
7 MEASUREMENT SCIENCE AND TECHNOLOGY 8784 5% 1% 56
8 MEASUREMENT 7310 3% 1% 35
9 JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY 6875 1% 2% 16
10 ACCREDITATION AND QUALITY ASSURANCE 4536 1% 1% 15

Author Key Words


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass LCSH search Wikipedia search
1 AVOGADRO CONSTANT 1914904 7% 93% 78 Search AVOGADRO+CONSTANT Search AVOGADRO+CONSTANT
2 WATT BALANCE 1730863 6% 92% 71 Search WATT+BALANCE Search WATT+BALANCE
3 KILOGRAM 1697942 6% 94% 68 Search KILOGRAM Search KILOGRAM
4 PLANCK CONSTANT 798129 3% 75% 40 Search PLANCK+CONSTANT Search PLANCK+CONSTANT
5 INTERNATIONAL SYSTEM OF UNITS 376347 2% 65% 22 Search INTERNATIONAL+SYSTEM+OF+UNITS Search INTERNATIONAL+SYSTEM+OF+UNITS
6 MASS STANDARDS 371792 1% 94% 15 Search MASS+STANDARDS Search MASS+STANDARDS
7 JOULE BALANCE 330478 1% 83% 15 Search JOULE+BALANCE Search JOULE+BALANCE
8 FUNDAMENTAL PHYSICAL CONSTANTS 305920 2% 64% 18 Search FUNDAMENTAL+PHYSICAL+CONSTANTS Search FUNDAMENTAL+PHYSICAL+CONSTANTS
9 SILICON SPHERE 304817 1% 82% 14 Search SILICON+SPHERE Search SILICON+SPHERE
10 PLANCKS CONSTANT 289207 2% 58% 19 Search PLANCKS+CONSTANT Search PLANCKS+CONSTANT

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 16064 CRYOGENIC CURRENT COMPARATOR//IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT//RESISTANCE MEASUREMENT
2 13877 JOSEPHSON ARRAYS//VOLTAGE STANDARD//JOSEPHSON VOLTAGE STANDARD
3 3240 LAMB SHIFT//BOUND STATE QED//KASTLER BROSSEL
4 14183 METROLOGIA//MEASUREMENT UNCERTAINTY//COVERAGE INTERVAL
5 22988 ATOMIC WEIGHT//MC ICP MS//USGS REFERENCE MATERIAL
6 24359 GAMMA GAMMA COINCIDENCE SPECTRA//NUCLEAR LIFETIMES//ANTI COMPTON HPGE GAMMA RAY SPECTROMETER
7 27028 PISTON GAUGE//PRIMARY PRESSURE STANDARD//METROLOGIA
8 32338 SONIC NOZZLE//CRITICAL NOZZLE//CRITICAL PRESSURE RATIO
9 11124 TORSION BALANCE//GRAVITATIONAL CONSTANT//NEWTONIAN GRAVITATIONAL CONSTANT
10 10324 HETERODYNE INTERFEROMETRY//HETERODYNE INTERFEROMETER//NANOMETER MEASUREMENT

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