OOIR: Observatory of International Research

Papers

(The TQCC of Metrologia is 2. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-03-01 to 2025-03-01.)

Article	Citations
CCQM-K91.2022 key comparison on pH of an unknown phthalate buffer	48
CCQM-P123 number and geometric property of cells adhered to a solid substrate	27
International comparison CCQM-P229 pilot study to measure line intensities of selected ¹²C¹⁶O transitions	26
Final report of the supplementary comparison between NIMT and LNE on pressure standards in the range 50 MPa to 500 MPa of hydraulic gauge pressure	25
Corrigendum: Detection and identification of faults in clock ensembles with the generalized likelihood ratio test (2022 Metrologia 59 045010)	21
Bilateral comparison of 1.018 V and 10 V standards between the NSAI (Ireland) and the BIPM, May to June 2024 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	19
Final report of APMP comparison of mass standards APMP.M.M-K5 (Sub-) multiples mass key comparison	18
Final report on the EURAMET key comparison EURAMET AUV.V-K5	18
Key comparison BIPM.RI(I)-K1 of the air-kerma standards of the NMIJ, Japan and the BIPM in ⁶⁰Co gamma radiation	17
Comparison of liquid density measurements among SIM NMIs - SIM.M.D-S7	15
Final report on the key comparison CCAUV.A-K6	15
SIM Thermocouple Type S Supplementary Comparison	14
Wavemeter calibration by frequency comb	14
Use of bidirectional transmittance distribution function measurements to determine transmittance haze	14
Characterization of the collisional frequency shift in an atomic fountain clock using absorption imaging	14
Proposal for the dimensionally consistent treatment of angle and solid angle by the International System of Units (SI)	14
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with NMC-A*STAR, July 2022	13
Temperature dependence correction method of LED filament lamp for total luminous flux calibration based on voltage measurement	13
Final report for SIM.QM-S12: supplementary comparison for trace elements in natural water	13
EURAMET Key Comparison EURAMET.M.D-K4.2020: Hydrometer calibration comparison from 600 kg/m³ to 2000 kg/m³	12
Toward a unified formulation of the acoustic transfer admittance of cylindrical cavities for reciprocity calibration of microphones	12
SIM.T-K9.3: Standard platinum resistance thermometer ITS-90 realizations from the Hg triple point to the Zn freezing point	12
The value of stable, comparable and standardised measurement: enabling confidence in decision making for societal challenges	11
Report on EURAMET supplementary comparison on measurement of a 1 mm stage micrometer	11
Measuring and adjusting the distance between the center of mass and optical center of a free-falling body in an absolute gravimeter	11

APMP key comparison report of air kerma for ¹³⁷Cs (APMP.RI(I)-K5)	11
Corrigendum: Corrections to a proposal for three categories of units within the SI (2024 Metrologia 61 033001)	11
A ⁸⁷Sr optical lattice clock with 2.9 × 10⁻¹⁷ uncertainty and its absolute frequency measurement	11
A Bayesian statistical method for large-scale MEMS-based sensors calibration: a case study on 100 digital accelerometers	11
Elements in lipstick material	10
Realization and evaluation of the triple point of sulfur hexafluoride	10
A numerical investigation of effective optical characteristics of dielectric mixture layer on Si sphere by FDTD method	10
Calibration of gauge blocks by optical interferometry comparison - final report	10
Supplementary comparison CCRI(I)-S3 of standards for absorbed dose to water in ⁶⁰Co gamma radiation at radiation processing dose levels	10
Supplementary comparisons of DC high voltage measuring reference instruments COOMET 449Ru-a08 (COOMET_EM-S7)	10
Editorial for the Metrologia Focus Issue on Length Metrology	9
Corrigendum: Refractive index gas thermometry between 13.8 K and 161.4 K (2021 Metrologia 58 025008)	9
CCQM-K160: platinum group elements in automotive catalyst	9
Traceability for nuclear medicine: the status of primary radioactivity standards	9
Flexures for Kibble balances: minimizing the effects of anelastic relaxation	9
International comparison CCQM-K3.2019 automotive exhaust gases	9
CCQM-P206, nitrous oxide (N₂O) in air, ambient level, pilot study run in parallel with CCQM-K68.2019	9
Decadal validation of the LASP TRF cryogenic radiometer by NIST, and establishment of a replacement room temperature standard*	9
Bilateral comparison of 1.018 V and 10 V standards between CSIR-NPL (India) and the BIPM, April to June 2022 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	8
Bilateral comparison of irradiance scales between PMOD/WRC and PTB for longwave downward radiation measurements	8
COOMET regional comparison of the national standards of air kerma for x-radiation qualities used for radiation protection and diagnostic radiology (COOMET.RI(I)-S3)	8
International comparison CCQM-K150: particle number concentration (100 to 20 000 cm^-3) and particle charge concentration (0.15 to 3 fC cm^-3)	8
ITS-90 SPRT calibration from the Ar TP to the Zn FP	8
Evaluation of the relativistic redshift in frequency standards at KRISS	8
A further short history of the SI prefixes	8
Monitoring of the offset between UTC and its prediction broadcast by the GNSS	8
Bilateral comparison of 1.018 V and 10 V standards between DEFNAT (Tunisia) and the BIPM, April to June 2022 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	7
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with EMPA, June 2023	7
News from the BIPM laboratories—2023	7
Supplementary comparison of national standard instruments in the field of magnetic flux density and magnetic flux measurements by sensing coils	7
Noise-induced servo errors in optical clocks utilizing Rabi interrogation	7
Key comparison study - organic solvent calibration solution - gravimetric preparation and value assignment of deoxynivalenol (DON) in acetonitrile (ACN)	7
Euramet RMO supplementary comparison low pressure air flow between 25m³/h and 400 m³/h	7
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the BEV, Austria and the BIPM in ¹³⁷Cs gamma radiation	7
Traceable methods for calibrating condensation particle counters at concentrations down to 1 cm⁻³	6
Comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the PTB, Germany, and the BIPM, in accelerator photon beams	6
Comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the NRC, Canada and the BIPM in accelerator photon beams	6
Final report on CCQM-K167: carbon isotope delta measurements of vanillin	6
Key comparison study on peptide purity - hexapeptide of HbA0	6
Update of the BIPM comparison BIPM.RI(II)-K1.Ga-67 of activity measurements of the radionuclide ⁶⁷Ga to include the 2023 result of the CMI (Czechia)	6
Automatic alignment technique for the suspended coil in the joule balance	6
Final report on the CCPR Key Comparison CCPR-K3.2014 Luminous Intensity	6
SIM.M.P-S8 final report	6
Supplementary comparison for the traceability of AC high voltage reference measuring systems up to 200 kV (EURAMET.EM-S33)	6
Determination of elements in river water	6
APMP key comparison of luminous intensity (APMP.PR-K3.a): final report	6
Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the NIM, China and the BIPM in ⁶⁰Co gamma radiation	6
Adoption of ICRU report 90 recommendations in the Canadian Co-60 air-kerma primary standard	6
Final report on EURAMET key comparison EURAMET.M.D-K2.2 (1523)	5
CIPM key comparison of viscosity CCM.V-K4	5

Improved absolute frequency measurement of the strontium ion clock using a GPS link to the SI second	5
Final report of the EURAMET supplementary comparison of mass standards of 20kg	5
Key comparison BIPM.RI(I)-K1 of the air-kerma standards of the NIST, USA and the BIPM in ⁶⁰Co gamma radiation	5
Primary standard for traceability in low liquid hydrocarbon fuel flow rates	5
CCQM-K161 "Anions in Seawater"	5
Corrigendum: Calibrating spectrometers for measurements of the spectral irradiance caused by solar radiation (2020 Metrologia 57 065027)	5
Measurement of melting and freezing temperature of iron using radiation thermometry	5
AFRIMETS.EM-S2: comparison on digital multimeter for DC voltage, DC current, DC resistance, AC voltage and AC current parameters	5
Final report to the CCT on key comparison CCT-K8 - comparison of local realisations of dew-point temperature of humid gas in the range 30 °C to 95 °C	5
Update of the BIPM comparison BIPM.RI(II)-K1.Mn-54 of activity measurements of the radionuclide ⁵⁴Mn to include the 2024 result of the POLATOM (Poland)	5
Assay of sodium carbonate	5
Report of the CCRI(II) supplementary international comparison of measurement of activity per unit mass of Cs-134 and Cs-137 in wheat flour (CCRI(II)-S13)	5
RMO SC comparison COOMET.M.H-S3	5
Supplementary comparisons of national standards of ratio error and phase displacement of AC voltage of power frequency COOMET 411/RU-a/07 (COOMET.EM-S6)	5
Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the PTB, Germany, and the BIPM in mammography x-rays	5
CCAUV.W-K2 final report - key comparison CCAUV.W-K2: calibration of hydrophones in the frequency range from 250 Hz to 500 kHz	5
Characterization of the LED filament lamp for luminous intensity calibration	5
Final report of CCQM-K96.2023: assay of potassium dichromate	5
APMP.M.H-S5 final report of the supplementary comparison of Brinell hardness	5
Final report of APMP.AUV.V-S2: supplementary comparison on calibration of laser tachometers using mechanical generators or optical simulators	5
Towards traceable dynamic pressure calibration using a shock tube with an optical probe for accurate phase determination	4
Practical realisation of the kelvin by Johnson noise thermometry	4
Remote time and frequency calibration with holdover traceability from a new treatment of non-white noise in rubidium clocks	4
APMP key comparison of AC-DC current transfer standards: final report	4
Comparison of low air speed facilities	4
Key comparison study on peptide purity - glycated hexapeptide of HbA1c	4
A constant pressure flowmeter for extreme-high vacuum	4
Traceable quantitative analysis of Ag_xCu_1−x alloy films by ID ICP-MS, RBS and MEIS	4
CCQM-K68.2019, nitrous oxide (N₂O) in air, ambient level, final report	4
Femtosecond-comb based 10 MHz-to-optical frequency link with uncertainty at the 10⁻¹⁸ level	4
Anomaly detection for atomic clocks using unsupervised machine learning algorithms	4
Acoustic measurement of the triple point of neon T _Ne and thermodynamic calibration of a transfer standard for accurate cryogenic thermometry	4
The CIPM list ‘Recommended values of standard frequencies’: 2021 update	3
A robust time scale for space applications using the student’s t-distribution	3
Extension of NIM illuminance scale to very low levels (1 × 10⁻¹⁰ lx to 2 lx)	3
The candela realisation using molybdenum carbon fixed-point blackbody	3
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with DHMZ, July 2022	3
Measurement of bidirectional transmittance distribution function in the visible and near-infrared spectral range	3
Angles in the SI: a detailed proposal for solving the problem	3
Supplementary comparison of national measurement standards of gauge pressure in the range from 1 MPa to 10 MPa	3
Precise density measurement and its uncertainty evaluation for refractory liquid metals over 3000 K using electrostatic levitation	3
Comparison of liquid samples of density	3
On the uncertainties in the realization of the kelvin based on thermodynamic temperatures of high-temperature fixed-point cells	3
Electron paramagnetic resonance study of silicon-28 single crystal for realization of the kilogram	3
Mass fraction assignment of Bisphenol-A high purity material	3
Gas flow standards and their uncertainty	3
Key comparison BIPM.RI(I)-K8 of high dose-rate ¹⁹²Ir brachytherapy standards for reference air kerma rate of the VSL and the BIPM	3
Role of measurement uncertainty in the comparison of average areal rainfall methods	3
Thickness and refractive index measurements of a thin-film using an artificial neural network algorithm	3
Bilateral comparison of 1 Ω and 10 kΩ standards (ongoing BIPM key comparison BIPM.EM-K13) between the NPLI (India) and the BIPM	3
Refractive index gas thermometry between 13.8 K and 161.4 K	3
Novel developments of refractive power measurement techniques in the automotive world	3
Assessment of the INRIM trace water generator and analysis of the uncertainty components down to −100 °C frost-point temperature	3
SIM key comparison in pneumatic gauge pressure for high accuracy pressure balances up to 120 kPa (SIM.M.P-K6)	3
Bilateral Comparison of 1.018 V and 10 V Standards between the SMD (Belgium) and the BIPM, October to December 2021 (part of the ongoing BIPM key comparison BIPM.EM-K11)	3
Rejection sampling for Bayesian uncertainty evaluation using the Monte Carlo techniques of GUM-S1	3
Bilateral key comparison EURAMET.EM-K11.1 "AC-DC Voltage Transfer Difference at Low Voltages"	3
Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the BFKH, Hungary, and the BIPM in low-energy x-rays	3
The CCL-K11 on-going key comparison. Final report for the period 2018 to 2020	3
High-fidelity analysis of the electro-optical non-equivalence of planar electrical substitution radiometers^*	3
The CCL-K11 ongoing key comparison. Final report for 2023	3
Comparison report between NIM and CMS of the ITS-90 realization at the triple point of argon	3
Report on the key comparison, CCM.F-K23 in force at 200 N and 500 N	3
Relating SI units to the ‘defining constants’	3
Final report on EURAMET key comparison EURAMET.M.D-K2.1 (1522)	3
Final report of CCQM-P225a and b, international comparison on carbon dioxide in air and nitrogen at ambient levels (350 μmol/mol to 800 μmol/mol)	3
Calibration of angle standards	3
PAWG Pilot Study on Quantification of SARS-CoV-2 Monoclonal Antibody - Part 1	3
Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the NRC, Canada and the BIPM in ⁶⁰Co gamma radiation	3
Supplementary comparison of the measurement of the alpha and beta particle surface emission rates from large area sources (CCRI(II)-S10 LASCE)	3
A bilateral comparison of NIST and PTB laser power standards for scale realization confidence by gravitational wave observatories	3
Terahertz frequency counter based on a semiconductor-superlattice harmonic mixer with four-octave measurable bandwidth and 16-digit precision	3
Statistics for quantifying aging in time transfer system delays	3
Report of subsequent key comparison CCQM - K73.2018.2 amount content of H+ in hydrochloric acid (0.1 mol/kg-1)	3
COOMET key comparison COOMET.PR-K1.a.2018 for spectral irradiance 250 nm to 2500 nmm, final report	3
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the GUM, Poland and the BIPM in ¹³⁷Cs gamma radiation	2
Line intensities of CO near 1560 nm measured with absorption and dispersion spectroscopy	2
Final report of CCQM-K172 on measurement of Specific Adsorption A [mol/kg] of Ar on zeolite at liquid argon temperature (to enable a traceable determination of the Specific Surface Area by following I	2
The influence of time varying magnetic fields on the determinations of Newton’s constant at the Bureau International des Poids et Mesures	2
Supplementary comparison study - measurement capabilities for the quantification of ethanol in water	2

New beta primary standard (BPS2) and revised ISO 6980 at PTB	2
Compensation of isotope ratio mismatch in double isotope dilution inductively coupled plasma mass spectrometry (ID-ICP/MS)	2
Achieving traceability to UTC through GNSS measurements	2
AFRIMETS supplementary comparison on calibration of external micrometer	2
Detection and identification of faults in clock ensembles with the generalized likelihood ratio test	2
Report on key comparison AFRIMETS.AUV.V-K5 and linking to CCAUV.V-K5	2
The CIPM MRA—success and performance	2
Final report, onoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with UBA, July 2023	2
Key comparison BIPM.RI(I)-K3 of the air-kerma standards of the PTB, Germany, and the BIPM in medium-energy x-rays	2
Determination of mathematical expectations of two weighting statistics for ensemble time scales	2
Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the BFKH, Hungary and the BIPM in ⁶⁰Co gamma radiation	2
Final report on GULFMET supplementary comparison of high current transformer measuring systems (GULFMET.EM-S7)	2
Conversion of a piston–cylinder dimensional dataset to the effective area of a mechanical pressure generator	2
Determining the calibration factor of Rn-220 by low-pressure scintillation cell	2
Quantum plasmonic sensing by Hong–Ou–Mandel interferometry	2
Ytterbium optical lattice clock with instability of order 10⁻¹⁸	2
CIPM key comparison CCPR-K1.a.2017 for spectral irradiance 250 nm to 2500 nm. Final report	2
Eight-element polarisation independent transmission trap detector with high attenuation	2
Determination of sensitivity coefficients and their uncertainties in Rockwell hardness measurement: a Monte Carlo method for multiple linear regression	2
AFRIMETS supplementary comparison on calibration of caliper	2
Coherent fiber links operated for years: effect of missing data	2
ITS-90 reproducibility, xenon fixed point substitution and new interpolating equations between 13.8033 K and 273.16 K	2
The CCL-K11 ongoing key comparison. Final report for 2021	2
CCQM-K155: elements and tributyltin in seawater	2
Update of the BIPM comparison BIPM.RI(II)-K1.Sn-113 of activity measurements of the radionuclide ¹¹³Sn to include the 2017 result of the LNE-LNHB (France)	2
CCM.G-K2.2023: CIPM key comparison of absolute gravimeters	2
Measurement of average mass attenuation coefficient of air for ¹³⁷Cs gamma-ray irradiation beam	2
Final report of APMP.AUV.V-S1: supplementary comparison on calibration of laser tachometers using mechanical generators	2
Speed of sound measurements and derived third and fourth acoustic virial coefficients of supercritical neon	2
Results of the EURAMET.RI(II)-K2.Ho-166 key comparison for the activity of the radionuclide ¹⁶⁶Ho per unit mass of aqueous solution	2
EURAMET.T-K.7 Comparison : Inter-laboratory comparison of triple point of water cells	2
An SI for humans and a digital-SI for machines	2
Key comparison BIPM.RI(I)-K3 of the air-kerma standards of the BFKH, Hungary, and the BIPM in medium-energy x-rays	2
Final report comparison of the calibrations of hydrometers for liquid density determination among SIM laboratories, SIM.M.D-S6	2
Impact study of numerical discretization accuracy on parameter reconstructions and model parameter distributions	2
The Avogadro constant is not the defining constant of the mole	2
Report on comparison EURAMET.M.M-S10 (comparison of sub-multiples of the kilogram)	2
AFRIMETS supplementary comparison on calibration of feeler gauges	2
Economic optimization of acceptance interval in conformity assessment: 2. Process with unknown systematic effect	2
Supplementary comparisons of reference measuring systems of electric capacitance and loss dissipation factor on AC high voltage of power frequency COOMET 604/RU-a/13 (COOMET.EM-S18)	2
On the rationale for recent updates to the SI Brochure concerning angles and quantities with the unit one	2
Calibrating laser Doppler anemometers utilizing an optical chopper	2
A bilateral comparison of ²²⁷Th activity standards between National Physical Laboratory and National Institute of Standards and Technology	2
CCQM-K173.1 - Assay of sodium carbonate. Final report	2
Connector effects and reference plane influence in the N-Type connector	2
Update of the BIPM comparison BIPM.RI(II)-K1.Na-22 of activity measurements of the radionuclide ²²Na to include the 2022 result of the NMISA (South Africa)	2
Update of the BIPM comparison BIPM.RI(II)-K1.Ge-68 of activity measurements of the radionuclide ⁶⁸Ge to include the 2021 result of the NIM (China)	2