Items where Author is "Williams, J M"

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Items where Author is "Williams, J M"

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Peatain, S O; Dixon, T; Meeson, P J; Williams, J M; Kafanov, S; Pushkin, Yu A (2023) Simulating the Effects of Fabrication Tolerance on the Performance of Josephson Travelling Wave Parametric Amplifiers. Superconductor Science and Technology, 36 (4). 045017

Ireland, J; Reuvekamp, P G; Williams, J M; Peral, D; Diaz de Aguilar, D; Sanmamed, Y A; Sira, M; Maslan, S; Rzodkiewicz, P; Bruszewski, P; Sadkowski, G; Sosso, A; Cabral, V; Malmbekk, H; Pokatilov, A; Herick, J; Behr, R; Coskun Ozturk, T; Arifovic, M; Ilic, D (2023) A method for using Josephson voltage standards for direct characterization of high performance digitizers to establish AC voltage and current traceability to SI. Measurement Science and Technology, 31 (1). 015003

Williams, J M; Ireland, J; Rungger, I (2020) Application of conserved thermal-noise energy model to damped resonant behavior in cryogenic current comparators. Review of Scientific Instruments, 91 (10). 105115 ISSN 0034-6748

Shelly, C D; See, P; Rungger, I; Williams, J M (2020) Existence of Shapiro Steps in the Dissipative Regime in Superconducting Weak Links. Physical Review Applied, 13 (2). 024070 ISSN 2331-7019

Malmbekk, H; Shelly, C D; Williams, J M (2018) Calibrating a Voltmeter with a PJVS Using a DAC as a Real-Time Calibrated Transfer Standard. In: 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018), 8-13 July 2018, Paris, France.

Williams, J M; Shelly, C D; King, B J; Edmonds, K J (2018) Compact Cryogenic Current Comparator and Null Detector Assembly. In: 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018), 8-13 July 2018, Paris, France.

Shelly, C; See, P; Ireland, J; Roman, E J; Williams, J M (2017) Weak link nanobridges as single flux quantum elements. Supercond. Sci. Technol., 30 (9). 095013

Ireland, J; Cryer, A; Williams, J M; Houtzager, E*; Hornecker, R*; van den Brom, H E* (2016) Design of delta-sigma feedback loop for quantum voltage digitizer. In: 2016 Conference on Precision Electromagnetic Measurements (CPEM), 10-15 July 2016, Ottawa, Canada.

Giblin, S P; Yamahata, G*; Williams, J M; Rozhko, S; Janssen, T J B M; Fujiwara, A*; Kataoka, M (2016) Scaling the current from a GHz electron pump using CCC. In: 2016 Conference on Precision Electromagnetic Measurements (CPEM), 10-15 July 2016, Ottawa, Canada.

Janssen, T J B M; Rozhko, S; Williams, J M; Ireland, J; Giblin, S P; He, H*; Lara-Avila, S*; Kubatkin, S*; Yakimova, R*; Tzalenchuk, A (2016) Towards a cryogen-free table-top primary resistance standard. In: 2016 Conference on Precision Electromagnetic Measurements (CPEM), 10-15 July 2016, Ottawa, Canada.

Janssen, T J B M; Rozhko, S; Antonov, I*; Tzalenchuk, A; Williams, J M; Melhelm, Z*; He, H*; Lara-Avila, S*; Kubatkin, S*; Yakimova, R* (2015) Operation of graphene quantum Hall resistance standard in a cryogen-free table-top system. 2D Materials, 2 (3). 035015

Williams, J M (2014) AC voltage measurement at 1 kHz using a quantum waveform synthesizer and application to the measurement of dynamic quantities. In: 29th Conference on Precision Elecetromagnetic Measurements (CPEM 2014), 24-29 August 2014, Rio de Janeiro, Brazil.

Williams, J M; Patel, P D; Holubar, T*; Good, J* (2014) Cryogenic current comparator bridge with dual SQUID detectors. In: 29th Conference on Precision Electromagnetic Measurement (CPEM 2014), 24-29 August 2014, Rio de Janeiro, Brazil.

Ireland, J; Henderson, D; Williams, J M; Kieler, O*; Kohlmann, J*; Behr, R*; Gran, J*; Malmbekk, H*; Lind, K*; Chi Kwong Tang* (2014) An optoelectronic coupling for pulse-driven Josephson junction arrays. In: 29th Conference on Precision Electromagnetic Measurements (CPEM 2014), 24-29 August 2014, Rio de Janeiro, Brazil.

Williams, J M; Auty, F J; Stubbins, R; Brooks, B*; Weaver, A*; Cunningham, M*; Whitehead, T*; Cash, M* (2014) Beginner's guide to measurement in electronic and electrical engineering. Measurement Good Practice Guide. 132

Williams, J M (2013) Cryogenic current comparators for the realisation of electrical quantum standards. MAPAN, J. Metrol. Soc. India, 28 (4). pp. 335-340.

Henderson, D; Williams, J M; Yamada, T* (2012) Application of a Josephson quantum voltage source to the measurement of microsecond timescale settling time on the Agilent 3458A 8½ digit voltmeter. Meas. Sci. Technol., 23 (12). 124006

Giblin, S P; Kataoka, M; Fletcher, J D; See, P; Janssen, T J B M; Williams, J M; Griffiths, J P*; Jones, G A C*; Farrer, I*; Ritchie, D A* (2012) Part-per-million current accuracy in the tunable-barrier electron pump. In: 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012), 1-6 July 2012, Washington DC, USA.

Williams, J M; Henderson, D; Yamada, T* (2012) Quantum waveform synthesizer using Nb/TiN/Nb binary-divided Josephson junction arrays. In: 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012), 1-6 July 2012, Washington DC, USA.

Sephton, J P; Williams, J M; Johansson, L C; Phillips, H C (2012) A low noise preamplifier with optoelectronic overload protection for radioactivity measurement. Appl. Radiat. Isot., 70 (9). pp. 2047-2050.

Williams, J M; Rietveld, G*; Houtager, E*; Janssen, T J B M (2011) Design considerations for a CCC bridge with complete digital control. IEEE Trans. Instrum. Meas., 60 (12). pp. 3907-3912.

Janssen, T J B M; Fletcher, N E*; Goebel, R*; Williams, J M; Tzalenchuk, A; Yakimova, R*; Kubatkin, S*; Lara-Avila, S*; Falko, V I* (2011) Graphene, universality of the quantum Hall effect and redefinition of the SI system. New J. Phys., 13. 093026

Williams, J M; Henderson, D; Pickering, J*; Behr, R*; Muller, F*; Scheibenreiter, P* (2011) Quantum referenced voltage waveform synthesizer. IET Sci. Meas. Technol., 5 (5). pp. 163-174.

Williams, J M (2011) The cryogenic current comparator and its application to electrical metrology. IET Proc. Sci. Meas. Technol., 5 (6). pp. 211-224.

Williams, J M; Janssen, T J B M; Rietveld, G*; Houtzager, E* (2010) An automated cryogenic current comparator resistance ratio bridge for routine resistance measurements. Metrologia, 47 (3). pp. 167-174.

Milton, M J T; Williams, J M; Forbes, A B (2010) The quantum metrology triangle and the redefinition of the SI ampere and kilogram; analysis of a reduced set of observational equations. Metrologia, 47 (3). pp. 279-286.

Williams, J M; Smith, D R*; Georgakopoulos, D*; Patel, P D*; Pickering, J R* (2009) Design and metrological applications of a low noise, high electrical isolation measurement unit. IET Proc. Sci. Meas. Technol., 3 (2). pp. 165-174.

Sephton, J P; Johansson, L C; Williams, J M (2008) A low noise current sensitive amplifier-discriminator system for beta particle counting. Appl. Radiat. Isot., 66 (6-7). pp. 890-894.

Williams, J M; Henderson, D; Patel, P; Behr, R*; Palafox, L* (2007) Achieving sub-100-ns switching of programmable Josephson Arrays. IEEE Trans. Instrum. Meas., 56 (2). pp. 651-654.

Giblin, S P; Williams, J M (2007) Automation of a coaxial bridge for calibration of AC resistors. IEEE Trans. Instrum. Meas., 56 (2). pp. 373-377.

Burroughs Jr, C J*; Benz, S P*; Dresselhaus, P D*; Waltrip, B C*; Nelson, T L*; Yonuk Chong*,; Williams, J M; Henderson, D; Patel, P; Palafox, L*; Beht, R* (2007) Development of a 60 Hz power standard using SNS programmable Josephson voltage standards. IEEE Trans. Instrum. Meas., 56 (2). pp. 289-294.

Milton, M J T; Williams, J M; Bennett, S J (2007) Modernising the SI: towards an improved, accessible and enduring system. Metrologia, 44 (5). pp. 356-364.

Fletcher, N E; Giblin, S P; Williams, J M; Lines, K J (2007) New capability for generating and measuring small DC currents at NPL. IEEE Trans. Instrum. Meas., 56 (2). pp. 326-330.

Williams, J M; Henderson, D; Patel, P; Behr, R*; Palafox, L* (2006) Achieving sub-100 ns switching of programmable Josephson arrays. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Rietveld, G*; Williams, J M; Houtzager, E*; Janssen, T J B M (2006) Automated CCC bridge for precision resisance measurements. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Georgakopoulos, D; Williams, J M; Knott, A J; Esward, T J; Wright, P S (2006) Dynamic characterisation of the electronic instrumentation used in the calibration of fatigue testing machines. IEE Proc. Sci. Meas. Technol., 153 (6). pp. 256-259.

Fletcher, N E; Giblin, S P; Williams, J M; Lines, K J (2006) New capability for generating and measuring small DC currents at NPL. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Behr, R*; Palafox, L*; Funck, T*; Williams, J M; Patel, P; Katkov, A (2006) Synthesis of precision calculable AC waveforms. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Giblin, S P; Belliss, J H; Williams, J M (2006) An automated coaxial bridge for calibration of AC resistors. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Rusby, R; De Podesta, M; Williams, J M (2005) Review of methods for a redetermination of the Boltzmann constant. NPL Report. DEPC-TH 006

Georgakopoulos, D; Williams, J M; Knott, A J; Esward, T J; Wright, P S (2005) Dynamic calibration of fatigue testing machines. In: BEMC 2005 - British Electromagnetic Measurements Conference, 14-17 November 2005, NPL, UK.

Leach, R K; Oldfield, S; Awan, S A; Blackburn, J; Williams, J M (2004) Design of a bi-directional electrostatic actuator for realising nanonewton to micronewton forces. NPL Report. DEPC-EM 001

Georgakopoulos, D; Pickering, J R*; Williams, J M; Wright, P S (2004) Oversampling delta-sigma ADC for metrology applications. In: Conference on Precision Electromagnetic Measurements (CPEM) 2004, 27 June - 2 July 2004, London, UK.

Kibble, B P; Williams, J M; Jones, R G; Cook, J*; Crisp, P*; Knight, B*; Pickering, J*; Skinner, D* (2003) A guide to measuring direct and alternating current and voltage below 1 MHz. Technical Report. Institute of Measurement and Control / National Physical Laboratory.

Kleinschmidt, P; Williams, J M; Fletcher, N E; Janssen, T J B M (2002) Cryogenic current comparator bridge for quantum Hall resistance ratio measurements. IEE Proc. Sci. Meas. Technol., 149 (6). pp. 302-304.

Kleinschmidt, P; Patel, P; Williams, J M; Janssen, T J B M (2002) Investigation of binary Josephson Arrays for arbitary waveform synthesis. IEE Proc. Sci. Meas. Technol., 149 (6). pp. 313-316.

Kleinschmidt, P; Patel, P; Williams, J M; Janssen, T J B M; Behr, R*; Kohlmann, J*; Niemeyer, J*; Hassel, J*; Seppa, H* (2001) Arbitary waveform synthesis using binary Josephson arrays. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Janssen, T J B M; Williams, J M (2001) Controlling the laboratory using LabVIEW™. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Awan, S A; Williams, J M; Bryant, S; Roberts, P C A (2001) Progress towards Internet-based calibration of electrical quantities. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Fletcher, N E; Janssen, T J B M; Williams, J M (2001) A cryogenic current comparator based resistance bridge for the range 10 k to 1 G . In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Kleinschmidt, P; Williams, J M; Fletcher, N E; Janssen, T J B M (2001) A cryogenic current comparator for quantum Hall resistance ration measurements. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Patel, P; Williams, J M; Janssen, T J B M (2001) A programmable bias source for binary Josephson junction arrays. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Giblin, S P; Awan, S A; Williams, J M; Schurr, J*; Melcher, J*; Campenhausen, A V*; Pierz, K*; Hein, G* (2000) Frequency dependance of the AC Quantum Hall effect; comparison of data from two laboratories. In: Conference on Precision Electromagnetic Measurements (CPEM) 2000, May 2000, Sydney, Australia.

Dudley, R A; Ridler, N M; Williams, J M (2000) Internet-based calibrations of electrical quantities at UK's National Physical Laboratory. CalLab Mag., 7 (6). pp. 22-25.

Dudley, R A; Ridler, N M; Williams, J M (2000) Internet-based calibrations of electrical quantities at the UK's National Physical Laboratory. In: National Conference of Standards Laboratories (NCSL) Workshop and Symposium, 16-20 July 2000, Toronto, Canada.

Fletcher, N E; Williams, J M; Janssen, T J B M (2000) A cryogenic current comparator resistance ratio bridge for the range 10k Ohms to 1G ohms. In: Conference on Precision Electromagnetic Measurements (CPEM) 2000, May 2000, Sydney, Australia.

Fletcher, N E; Williams, J M (1999) A CCC resistance bridge for the range 10 kO to a GO. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Williams, J M; Brown, D* (1999) Comparison of a Measurements International model 6010B current comparator bridge with a cryogenic current comparator bridge at the National Physical Laboratory. In: NCSL 99- National Conference of Standards Labouratories Workshop and Symposium, July 1999, Charlotte, NC, USA.

Williams, J M; Porter, C H (1999) Environmental and transport effects on transfer standards. In: UNSPECIFIED.

Giblin, S P; Hartland, A; Williams, J M (1999) Measurement of very high leakage resistance in 1 pF cryogenic capacitors using a set detector. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Giblin, S P; Williams, J M (1999) New techniques for transferring electrical quantities; the AC quantum Hall effect as an impedence standard. IEE Seminar, 1999/0. pp. 8/1-3.

Williams, J M; Porter, C H; Lyons, W* (1999) Power supplies and measurement techniques for the calibration of high current DC shunts. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Thompson, R P; Fletcher, N E; Williams, J M; Henderson, L C A (1999) The automated two Josephson array system for RVD calibrations. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Griffin, R*; Pope, P*; Fletcher, N E; Williams, J M (1999) A comparison of cryogenic current comparator resistance bridges and quantised hall resistance standards at NPL. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Kleinschmidt, P; Williams, J M (1999) A cryogenic current comparator bridge for frequencies up to 100 Hz. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Williams, J M; Kleinschmidt, P (1999) A cryogenic current comparator bridge for resistance measurements at currents of up to 100 A. IEEE Trans. Instrum. Meas., 48 (2). pp. 375-378.

Kibble, B P; Williams, J M; Henderson, L C A; Atreed, D*; Bramley, P*; Cook, J*; Crisp, P*; Cronin, L*; Knight, B*; Outram, S*; Skinner, D*; Williams, B* (1999) A guide to measuring resistance and impedance below 1 MHz. Technical Report. Institute of Measurement and Control / National Physical Laboratory.

Pickering, J*; Thompson, R; Williams, J M (1999) A new compact isolated power supply for electrical metrology at low signal levels. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Williams, J M; Kleinschmidt, P (1998) A cryogenic current comparator bridge for resistance measurements at currents of up to 100 A. In: CPEM '98 Conference on Precision Electromagnetic Measurements Conference Digest, 6-10 July 1998, Washington DC, USA.

White, D R*; Williams, J M (1997) A resistance network for verifying the accuracy of resistance bridges. IEEE Trans. Instrum. Meas., 46 (2). pp. 329-332.

White, D R*; Jones, K*; Williams, J M; Ramsey, I E* (1997) A simple resistance network for calibrating resistance bridges. IEEE Trans. Instrum. Meas., 46 (5). pp. 1068-74.

Henderson, L C A; Williams, J M; Hartland, A (1994) Research in support of calibration services in DC voltage and resistance at NPL, UK. In: Proc. XIII IMEKO World Congress, September 1994.

Williams, J M (1993) A DC current source for metrology applications. In: 6th British Electromagnetic Measurements Conference Digest (BEMC 93), 2-4 November 1993, NPL, Teddington, UK.

Williams, J M; Hartland, A; Dupuy, N B; Porter, C H (1993) Improvements in the traceability of resistance measurements at NPL. In: 6th British Electromagnetic Measurements Conference Digest (BEMC 93), 2-4 November 1993, NPL, Teddington, UK.

Henderson, L C A; Hartland, A; Williams, J M (1993) Measurements of 10V standards using a 1V Josephson array. IEEE Trans. Instrum. Meas., 42 (2). pp. 577-579.

This list was generated on Wed Oct 29 16:38:53 2025 GMT.