Results 1 to 10 of about 294,577 (164)
Refractive-index gas thermometry. [PDF]
Metrologia, 2019 The principles and techniques of primary refractive-index gas thermometry (RIGT) are reviewed. Absolute primary RIGT using microwave measurements of helium-filled quasispherical resonators has been implemented at the temperatures of the triple points of neon, oxygen, argon and water, with relative standard uncertainties ranging from 9.1 × 10-6 to 3.5 ×
Rourke PMC +6 more
europepmc +7 more sources
Research on the construction of a natural gas price index in China
Energy Strategy Reviews, 2020 A natural gas price index (NGPI) can be used by stakeholders to comprehensively evaluate the natural gas market. At present, there is no NGPI to measure the volatility of China's entire natural gas market.
Xinlei Yang +4 more
doaj +3 more sources
Perspective on the Refractive-Index Gas Metrology Data Landscape
Journal of Physical and Chemical Reference Data, 2021 The redefinition of the kelvin has increased focus on thermometry techniques that use the newly fixed value of the Boltzmann constant to realize thermodynamic temperature. One such technique that has advanced considerably in recent years is refractive-index gas thermometry.
P M C Rourke
exaly +2 more sources
A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR
Sensors, 2020 This paper presents a method for gas concentration determination based on the measurement of the refractive index dispersion of a gas near the gas resonance in the near-infrared region (NIR).
Matej Njegovec, Denis Donlagic
doaj +3 more sources
Research on oxidation characteristics of aqueous coal based on index gas method
Meitan kexue jishu, 2023 To research the influence of moisture on the oxidation characteristics of coal, the coal spontaneous combustion experiment was carried out to determine the composite index gas that can predict the spontaneous combustion of coal, and then the temperature ...
YI Xin +3 more
doaj +1 more source
矿业科学学报, 2022 In order to explore the low-temperature oxidation characteristics and evolution law of oxidized coal, this paper adopted a temperature-programmed experiment system.
Chen Rongfang +3 more
doaj +1 more source
Prediction model of coal spontaneous combustion temperature based on data filling
Gong-kuang zidonghua, 2023 Most of the existing coal spontaneous combustion temperature prediction models are based on relatively complete index gas sample data. However, the index gas data are affected by instruments or human factors.
ZHAI Xiaowei +5 more
doaj +1 more source
Meikuang Anquan, 2022 In order to master the relationship between the key active groups of weathered coal and oxidized coal at the characteristic temperature of coal spontaneous combustion, this paper takes the fresh coal as the reference coal to compare and analyze the ...
ZHAO Jingyu +4 more
doaj +1 more source
Prevention and control technology and goaf spontaneous combustion index in distance coal seams
Meikuang Anquan, 2022 In order to study the spontaneous combustion law of close distance easy spontaneous combustion coal seams, taking the mining face of Bulianta Mine No.22 coal seam 3# panel as an example, collected No.22 coal seam samples of Bulianta Mine, three particle ...
GUO Haixiang
doaj +1 more source
Meikuang Anquan, 2022 The coal seam group in the outburst mine has the characteristics of mutual influence in the mining process, the goaf is connected, there are many air leakage places, and the fire prevention work is difficult.
DONG Xiaoming +4 more
doaj +1 more source