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Topic Area: Quantum Electrical Measurements
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1. Development of Low Carrier Density Graphene Devices
Topic: Quantum Electrical Measurements
Published: 8/1/2014
Authors: Yanfei Yang, Lung-I Huang, David B Newell, Yasuhiro Fukuyama, Mariano A. Real, Randolph E Elmquist
Abstract: Epitaxial graphene on SiC(0001) is used to fabricate Hall bar structures for metrological applications with a fabrication process that has been developed to eliminate organic chemical contamination of the graphene. Before any lithographic patterning ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915345

2. A nonlinearity in permanent-magnet systems used in watt balances
Topic: Quantum Electrical Measurements
Published: 6/25/2014
Authors: Shisong Li, Stephan Schlamminger, Jon Robert Pratt
Abstract: In watt balances that employ permanent magnet systems to generate the magnetic flux the effects of the weighing current on the magnet systems can generate a systematic bias that can lead to an error in the result if not accounted for. In this article ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915643

3. Absorptive Limiter for Frequency Selective Circuits
Topic: Quantum Electrical Measurements
Published: 6/1/2014
Authors: Juan C. Collado Gomez, Eduard Rocas, James C Booth, Jordi Mateu, J. M. O'Callaghan, J. Verdu, A. Hueltes
Abstract: This paper describes a novel absorptive limiter for frequency selective circuits. The proposed circuit allows the design of absorptive limiters based on a bi-state phase shifter, which is appropriate for integration into channelizing devices, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914262

4. Development of a Quantum-Voltage-Calibrated Noise Thermometer at NIM
Topic: Quantum Electrical Measurements
Published: 9/11/2013
Authors: Jifeng Qu, Samuel Paul Benz, Jianqiang Zhang, Horst Rogalla, Yang Fu, Alessio Pollarolo, Jintao Zhang
Abstract: A quantum-voltage-calibrated Johnson-noise thermometer was developed at NIM, which measures the Boltzmann constant k through comparing the thermal noise across a 100  sense resistor at the temperature of the triple point water to the comb-lik ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910779

5. Johnson-noise thermometry based on a quantized-voltage noise source at NIST
Topic: Quantum Electrical Measurements
Published: 9/11/2013
Authors: Alessio Pollarolo, Tae H. Jeong, Samuel Paul Benz, Paul David Dresselhaus, Horst Rogalla, Weston Leo Tew
Abstract: Johnson Noise Thermometry is an electronic approach to measuring temperature. For several years, NIST has been developing a switching-correlator-type Johnson-noise thermometer that uses a quantized voltage noise source as an accurate voltage referenc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910730

6. Direct Comparison of two NIST PJVS systems at 10 V
Topic: Quantum Electrical Measurements
Published: 8/27/2013
Authors: Stephane Solve, Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz
Abstract: Two NIST Programmable Josephson Voltage Standard (PJVS) systems have been directly compared at 10V using different nanovoltmeters at the temperature of the laboratory. These PJVS systems use arrays double-stacked superconducting-niobium Josephson ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913689

7. Differential sampling measurement of a 7 V rms Sine Wave with a Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Alain Rufenacht, Charles J Burroughs, Paul David Dresselhaus, Samuel Paul Benz
Abstract: A 10 V programmable Josephson voltage standard has enabled sine waves with voltages up to 7 V rms to be accurately measured with a differential sampling measurement technique. Expanding the voltage range for this technique enables direct calibration ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911610

8. Flat Frequency Response in the Electronic Measurement of the Boltzmann Constant
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Jifeng Qu, Horst Rogalla, Yang Fu, Jianqiang Zhang, Alessio Pollarolo, Samuel Paul Benz
Abstract: A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with an integration p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911739

9. Johnson Noise Thermometry Measurement of the Boltzmann Constant with a 200 Ohm Sense Resistor
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Alessio Pollarolo, Tae H. Jeong, Samuel Paul Benz, Horst Rogalla
Abstract: In 2010, NIST measured the Boltzmann constant k with an electronic technique that measured the Johnson noise of a 100 Ω resistor at the triple point of water (TPW) and used a voltage waveform synthesized with a quantized voltage noise source (QV ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911711

10. Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: The amplitudes of stepwise-approximated sine waves generated by programmable Josephson voltage standards (PJVS) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911695



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