K_J
E629520
K_J is the standard symbol used to denote the Josephson constant, a fundamental physical constant relating voltage and frequency in superconducting Josephson junctions.
All labels observed (1)
| Label | Occurrences |
|---|---|
| K_J canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6938927 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: K_J Context triple: [Josephson constant, symbol, K_J]
-
A.
JK
JK is the widely used nickname of Juscelino Kubitschek, the former president of Brazil best known for founding Brasília and promoting rapid national development.
-
B.
KC(J)
KC(J) is a regional political party in the Indian state of Kerala, led by P. J. Joseph and primarily representing Christian agrarian interests.
-
C.
KIJ
KIJ is the three-letter IATA airport code for Niigata Airport in Niigata, Japan.
-
D.
Jkb
Jkb is the station code for Jakobsberg railway station in Sweden.
-
E.
KJK
KJK is the IATA airport code for Koksijde Air Base in Belgium.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: K_J Target entity description: K_J is the standard symbol used to denote the Josephson constant, a fundamental physical constant relating voltage and frequency in superconducting Josephson junctions.
-
A.
JK
JK is the widely used nickname of Juscelino Kubitschek, the former president of Brazil best known for founding Brasília and promoting rapid national development.
-
B.
KC(J)
KC(J) is a regional political party in the Indian state of Kerala, led by P. J. Joseph and primarily representing Christian agrarian interests.
-
C.
KIJ
KIJ is the three-letter IATA airport code for Niigata Airport in Niigata, Japan.
-
D.
Jkb
Jkb is the station code for Jakobsberg railway station in Sweden.
-
E.
KJK
KJK is the IATA airport code for Koksijde Air Base in Belgium.
- F. None of above. chosen
Statements (37)
| Predicate | Object |
|---|---|
| instanceOf |
fundamental constant
ⓘ
physical constant ⓘ |
| appearsIn | Josephson voltage-frequency relation NERFINISHED ⓘ |
| category | quantum electrical constant ⓘ |
| definedBy | K_J = 2e / h ⓘ |
| definesRelation |
K_J = f / V
ⓘ
V = (1 / K_J) · f ⓘ |
| dependsOnConstant |
Planck constant h
NERFINISHED
ⓘ
elementary charge e NERFINISHED ⓘ |
| fullName | Josephson constant NERFINISHED ⓘ |
| governs | frequency of Josephson radiation for a given voltage ⓘ |
| hasDimension | T⁻¹·I⁻¹·M·L² (via Hz·V⁻¹) ⓘ |
| hasExactValue |
483597.8484 GHz·V⁻¹
ⓘ
483597.8484 × 10^9 Hz·V⁻¹ ⓘ |
| hasExactValueSince | 2019-05-20 ⓘ |
| hasUncertainty | 0 (defined exact by SI) ⓘ |
| hasUnit | hertz per volt ⓘ |
| hasUnitSymbol | Hz·V⁻¹ ⓘ |
| isExactIn | revised SI based on fixed e and h ⓘ |
| isReciprocalOf | Josephson constant inverse (V·Hz⁻¹) used as flux quantum over h ⓘ |
| namedAfter | Brian D. Josephson NERFINISHED ⓘ |
| partOf | International System of Units NERFINISHED ⓘ |
| relatedConstant | von Klitzing constant R_K NERFINISHED ⓘ |
| relatedEffect |
AC Josephson effect
NERFINISHED
ⓘ
DC Josephson effect NERFINISHED ⓘ |
| relatesQuantity |
frequency
ⓘ
voltage ⓘ |
| standardizedBy |
BIPM
NERFINISHED
ⓘ
CODATA NERFINISHED ⓘ |
| symbolFor | Josephson constant NERFINISHED ⓘ |
| usedFor |
Josephson voltage standards
NERFINISHED
ⓘ
realization of the volt ⓘ |
| usedIn |
Josephson effect
NERFINISHED
ⓘ
calibration of voltage measurement instruments ⓘ quantum electrical metrology ⓘ superconducting Josephson junctions ⓘ voltage standards ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: K_J Description of subject: K_J is the standard symbol used to denote the Josephson constant, a fundamental physical constant relating voltage and frequency in superconducting Josephson junctions.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.