- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Development of a Specialized Hydrostatic Comparator for the Accurate Density Determination of Natural Silicon Spheres: A Novel Method for a Primary Realization of the Unit Kilogram
摘要： A novel method to primary realize the soon-to-be redefined unit of mass, kilogram, is presented. The new approach will accurately relate the Planck constant to spheres manufactured from natural silicon. Therefore, the precisely known isotopical composition of a 28Si sphere will be transferred to a sphere made of natural silicon with a relative uncertainty of 3 x 10-8. To achieve this objective, the concept of a newly developed hydrostatic comparator, which combines the Archimedes principle with a magnetic suspension coupling, is discussed. This combination allows to improve the major uncertainty contribution of this type of instrument — the temperature stability.
关键词： silicon spheres,magnetic suspension coupling,Avogadro constant,hydrostatic weighing,Planck constant,kilogram
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Preliminary Planck Constant Measurements in the UME Kibble Balance
摘要： This paper describes the measurement procedure of the UME oscillating-magnet Kibble balance and gives details of the preliminary Planck constant measurements on the trial version. The value of the Planck constant determined with this apparatus is (cid:2190)/(cid:2190)(cid:2786)(cid:2777) = (cid:2778). (cid:2777)(cid:2777)(cid:2777)(cid:2777)(cid:2777)(cid:2781) with a relative standard uncertainty of 6 ppm.
关键词： watt balance,Planck constant,Measurement,Kibble balance,SI units
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - The Simulations of the Effect of the External Field in the Joule Balance
摘要： Due to the movement of the main magnet, the effect of the external field is a critical problem in the joule balance. The FEM simulations of the external field both in the electromagnet system and permanent magnet system are performed in this paper. The results show that although the error caused by the external field is much smaller in the permanent magnet system than that in the electromagnet system, it still needs to be further reduced. More efficient solutions should be considered to eliminate the effect of the external field when the permanent magnet system is used.
关键词： external field,FEM simulation,Kibble balance,joule balance,the Planck constant
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Re-Evaluation of the Gravity Transfer Component of the NRC Kibble Balance
摘要： We describe a project to re-evaluate the transfer of the absolute determination of the local acceleration due to gravity from a nearby site, to the center of mass of the test mass in the NRC Kibble Balance. This re-evaluation includes the characterization of the sensitivity of a relative gravity meter to the fringing magnetic flux density, as well as the attenuation provided by a simple magnetic shield.
关键词： revised SI,Gravity measurement,watt balance,magnetic field,Planck constant,SI units
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - NIST Kibble Balance Performance
摘要： The fourth generation Kibble balance at the National Institute of Standards and Technology (NIST) has been operational and used to measure the value of the Planck constant from Fall 2015 to Spring 2017. Since then, researchers have been working on upgrades and checking the robustness of the experiment in preparation for the redefinition of the SI.
关键词： Kibble balance,Planck constant,redefinition of the SI,mass metrology
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Developing the Next Generation of NPL Kibble Balances
摘要： NPL is building a next generation Kibble balance to encourage more widespread primary realisations of the kilogram following the expected revision of the SI in 2019. The new balance does not require careful alignment of the coil and magnet and is aimed at a relative standard uncertainty of 2 × 10?8. This paper describes progress on the development of the two technology demonstrator instruments which will guide the design of the next generation of Kibble balances at NPL.
关键词： SI redefinition,watt balance,Planck constant,kilogram,Kibble balance,SI units
更新于2025-09-10 09:29:36
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The Double Slit Experiment-Explained
摘要： The wavelet envisioned by Huygen’s in diffraction phenomenon is re-interpreted as being polarized after passing through slit/hole which removed the electric field component from the Electromagnetic Radiation (EM-R), the remained wave consist of the Circular Magnetic Field (CMF), this CMF lost the speed of light and the electric field, hence it’s a short distance travel field, originated from the CMF produced by accelerated electrons, integrated with the Electric Field (EF) during the Flip-Flop (F-F) mechanism producing EM-R; hence the passing of light through a single hole/slit resulted in a CMF which reproduced as rings on the monitor screen in single wave diffraction, while the interference of two such CMF in double slits experiment, produced constructive or destructive interference forming patches on the monitor screen; and the perceived electron diffraction is an enter of two CMF from a single electron into a slit then emerged to produce constructive or destructive interference, in addition to the electron which entered and emerged from the slit with the stronger CMF, the paper finally derived the origin of Planck ‘constant (h) for the second time; the logical interpretation of double slits diffraction will restore the common sense in the physical world, distorted by the pilot wave.
关键词： Electron diffraction,wavelet,Circular magnetic field,Double slit experiment,Polarization,Origin of Planck’ constant
更新于2025-09-04 15:30:14