The Experts below are selected from a list of 137757 Experts worldwide ranked by ideXlab platform
Alessio Pollarolo - One of the best experts on this subject based on the ideXlab platform.
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johnson noise thermometry measurement of the boltzmann constant with a 200 omega sense resistor
IEEE Transactions on Instrumentation and Measurement, 2013Co-Authors: Alessio Pollarolo, Samuel P. Benz, T Jeong, Horst RogallaAbstract:In 2010, the National Institute of Standards and Technology measured the Boltzmann constant $k$ with an Electronic Technique that measured the Johnson noise of a 100 $\Omega$ resistor at the triple point of water and used a voltage waveform synthesized with a quantized voltage noise source (QVNS) as a reference. In this paper, we present measurements of $k$ using a 200 $\Omega$ sense resistor and an appropriately modified QVNS circuit and waveform. Preliminary results show agreement with the previous value within the statistical uncertainty. An analysis is presented, where the largest source of uncertainty is identified, which is the frequency dependence in the constant term $a_{0}$ of the two-parameter fit.
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johnson noise thermometry measurement of the boltzmann constant with a 200 ω sense resistor
Conference on Precision Electromagnetic Measurements, 2012Co-Authors: Alessio Pollarolo, Samuel P. Benz, T Jeong, Horst RogallaAbstract: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 (QVNS) as a reference. In this paper, we present measurements of k using a 200 Ω sense resistor and appropriately modified QVNS circuit and waveform. Preliminary results show agreement with the previous value within the statistical uncertainty. 1
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an Electronic measurement of the boltzmann constant
Metrologia, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Jifeng Qu, Horst Rogalla, Rod D WhiteAbstract:The Boltzmann constant k was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380 651(17) × 10−23 J K−1 is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise-thermometry measurement to achieve a relative combined uncertainty of 12 parts in 106. We describe the most recent improvements to our Johnson-noise thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 106, as well as the further reduction of spurious systematic errors and electromagnetic interference effects. The uncertainty budget for this measurement is discussed in detail.
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an Electronic measurement of the boltzmann constant
arXiv: Superconductivity, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Horst Rogalla, Weston L Tew, Rod D WhiteAbstract:The Boltzmann constant was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380651(18) \times 10^-23 J/K is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise thermometry measurement to achieve a relative combined uncertainty of 13 parts in 10^6. We describe the most recent improvements to our Johnson Noise Thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 10^6, as well as the further reduction of spurious systematic errors and EMI effects. The uncertainty budget for this measurement is discussed in detail.
Horst Rogalla - One of the best experts on this subject based on the ideXlab platform.
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johnson noise thermometry measurement of the boltzmann constant with a 200 omega sense resistor
IEEE Transactions on Instrumentation and Measurement, 2013Co-Authors: Alessio Pollarolo, Samuel P. Benz, T Jeong, Horst RogallaAbstract:In 2010, the National Institute of Standards and Technology measured the Boltzmann constant $k$ with an Electronic Technique that measured the Johnson noise of a 100 $\Omega$ resistor at the triple point of water and used a voltage waveform synthesized with a quantized voltage noise source (QVNS) as a reference. In this paper, we present measurements of $k$ using a 200 $\Omega$ sense resistor and an appropriately modified QVNS circuit and waveform. Preliminary results show agreement with the previous value within the statistical uncertainty. An analysis is presented, where the largest source of uncertainty is identified, which is the frequency dependence in the constant term $a_{0}$ of the two-parameter fit.
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johnson noise thermometry measurement of the boltzmann constant with a 200 ω sense resistor
Conference on Precision Electromagnetic Measurements, 2012Co-Authors: Alessio Pollarolo, Samuel P. Benz, T Jeong, Horst RogallaAbstract: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 (QVNS) as a reference. In this paper, we present measurements of k using a 200 Ω sense resistor and appropriately modified QVNS circuit and waveform. Preliminary results show agreement with the previous value within the statistical uncertainty. 1
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an Electronic measurement of the boltzmann constant
Metrologia, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Jifeng Qu, Horst Rogalla, Rod D WhiteAbstract:The Boltzmann constant k was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380 651(17) × 10−23 J K−1 is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise-thermometry measurement to achieve a relative combined uncertainty of 12 parts in 106. We describe the most recent improvements to our Johnson-noise thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 106, as well as the further reduction of spurious systematic errors and electromagnetic interference effects. The uncertainty budget for this measurement is discussed in detail.
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an Electronic measurement of the boltzmann constant
arXiv: Superconductivity, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Horst Rogalla, Weston L Tew, Rod D WhiteAbstract:The Boltzmann constant was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380651(18) \times 10^-23 J/K is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise thermometry measurement to achieve a relative combined uncertainty of 13 parts in 10^6. We describe the most recent improvements to our Johnson Noise Thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 10^6, as well as the further reduction of spurious systematic errors and EMI effects. The uncertainty budget for this measurement is discussed in detail.
Samuel P. Benz - One of the best experts on this subject based on the ideXlab platform.
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johnson noise thermometry measurement of the boltzmann constant with a 200 omega sense resistor
IEEE Transactions on Instrumentation and Measurement, 2013Co-Authors: Alessio Pollarolo, Samuel P. Benz, T Jeong, Horst RogallaAbstract:In 2010, the National Institute of Standards and Technology measured the Boltzmann constant $k$ with an Electronic Technique that measured the Johnson noise of a 100 $\Omega$ resistor at the triple point of water and used a voltage waveform synthesized with a quantized voltage noise source (QVNS) as a reference. In this paper, we present measurements of $k$ using a 200 $\Omega$ sense resistor and an appropriately modified QVNS circuit and waveform. Preliminary results show agreement with the previous value within the statistical uncertainty. An analysis is presented, where the largest source of uncertainty is identified, which is the frequency dependence in the constant term $a_{0}$ of the two-parameter fit.
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johnson noise thermometry measurement of the boltzmann constant with a 200 ω sense resistor
Conference on Precision Electromagnetic Measurements, 2012Co-Authors: Alessio Pollarolo, Samuel P. Benz, T Jeong, Horst RogallaAbstract: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 (QVNS) as a reference. In this paper, we present measurements of k using a 200 Ω sense resistor and appropriately modified QVNS circuit and waveform. Preliminary results show agreement with the previous value within the statistical uncertainty. 1
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an Electronic measurement of the boltzmann constant
Metrologia, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Jifeng Qu, Horst Rogalla, Rod D WhiteAbstract:The Boltzmann constant k was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380 651(17) × 10−23 J K−1 is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise-thermometry measurement to achieve a relative combined uncertainty of 12 parts in 106. We describe the most recent improvements to our Johnson-noise thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 106, as well as the further reduction of spurious systematic errors and electromagnetic interference effects. The uncertainty budget for this measurement is discussed in detail.
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an Electronic measurement of the boltzmann constant
arXiv: Superconductivity, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Horst Rogalla, Weston L Tew, Rod D WhiteAbstract:The Boltzmann constant was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380651(18) \times 10^-23 J/K is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise thermometry measurement to achieve a relative combined uncertainty of 13 parts in 10^6. We describe the most recent improvements to our Johnson Noise Thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 10^6, as well as the further reduction of spurious systematic errors and EMI effects. The uncertainty budget for this measurement is discussed in detail.
Qing Xia - One of the best experts on this subject based on the ideXlab platform.
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steady state power flow model of energy router embedded ac network and its application in optimizing power system operation
IEEE Transactions on Smart Grid, 2018Co-Authors: Jianqiang Miao, Ning Zhang, Chongqing Kang, Jianxiao Wang, Yi Wang, Qing XiaAbstract:The energy router is an emerging device concept that is based on an advanced power Electronic Technique. It is able to realize flexible and dynamic electric power distribution in power systems analogous to the function of information routers in the Internet. It is of great interest to investigate how the energy router can be used to optimize power system operation. This paper formulates the steady-state power flow model of the energy router embedded system network and the related optimal power flow formulation. The role of the energy router in providing extra flexibility to optimize the system operation is studied. Case studies are carried out on a modified IEEE RTS-79 system and a modified IEEE 118 bus system with the energy router. The results show that the energy router is able to optimize the operation of the power system through controlling the power injections and voltage of ports of the energy router. Operating objective such as adjusting branch power flow, improving bus voltage, and reducing active power losses of the grid can be reached under different objective functions.
Rod D White - One of the best experts on this subject based on the ideXlab platform.
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an Electronic measurement of the boltzmann constant
Metrologia, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Jifeng Qu, Horst Rogalla, Rod D WhiteAbstract:The Boltzmann constant k was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380 651(17) × 10−23 J K−1 is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise-thermometry measurement to achieve a relative combined uncertainty of 12 parts in 106. We describe the most recent improvements to our Johnson-noise thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 106, as well as the further reduction of spurious systematic errors and electromagnetic interference effects. The uncertainty budget for this measurement is discussed in detail.
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an Electronic measurement of the boltzmann constant
arXiv: Superconductivity, 2011Co-Authors: Samuel P. Benz, Alessio Pollarolo, Chiharu Urano, Paul D. Dresselhaus, Horst Rogalla, Weston L Tew, Rod D WhiteAbstract:The Boltzmann constant was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value of k = 1.380651(18) \times 10^-23 J/K is consistent with the current CODATA value and the combined uncertainties. This is our first measurement of k with this Electronic Technique, and the first noise thermometry measurement to achieve a relative combined uncertainty of 13 parts in 10^6. We describe the most recent improvements to our Johnson Noise Thermometer that enabled the statistical uncertainty contribution to be reduced to seven parts in 10^6, as well as the further reduction of spurious systematic errors and EMI effects. The uncertainty budget for this measurement is discussed in detail.