A5002536038- Radioactive Decay and Measurement Techniques
- Scientific Measurement and Uncertainty Evaluation
- Advanced X-ray Imaging Techniques
- Scientific Research and Discoveries
- History and advancements in chemistry
- Particle Accelerators and Free-Electron Lasers
- Heat Transfer Mechanisms
Shanghai Advanced Research Institute
2024
Chinese Academy of Sciences
2024
National Institute of Advanced Industrial Science and Technology
2020
This report describes the first CCM key comparison of realizations kilogram definition based on fixed numerical value Planck constant, which came into force 20 May 2019. The objectives were to determine level agreement between using Kibble and joule balances X-ray crystal density (XRCD) method provide input for calculation "consensus value" kilogram. consensus will serve as basis an internationally coordinated dissemination continue until sufficient realization experiments has been achieved....
The definition of the kilogram in International System Units (SI) is expected to be revised 2018. present kilogram, mass Prototype Kilogram (IPK), adopted 1889, would then replaced by a based on fixed numerical value Planck constant. Consultative Committee for Mass and Related Quantities has requested that, as one essential steps before redefinition, comparison realizations future realization methods, Kibble9 balances x-ray crystal density (XRCD) experiments, organized.
To enhance the stability of water-cooled double-crystal monochromator used at BL17B beamline Shanghai Synchrotron Radiation Facility (SSRF), a study was conducted to optimize its cooling system’s flow-induced vibration. Through simulation and experimental verification, researchers analyzed vibration mechanism implemented improvement measures. The results indicate that elastic bellows greatly amplify vibration, transmitting it first-crystal. By positioning closer crystal, relative pitch...