The paper presents some information about gas and coal outbursts threat in Polish coal mines.It shows the methodology for threat identification and monitoring for gas and coal outbursts in the Polish coal mines.One of...The paper presents some information about gas and coal outbursts threat in Polish coal mines.It shows the methodology for threat identification and monitoring for gas and coal outbursts in the Polish coal mines.One of the main methods of assessing threats in the mining industry in Poland and China is desorbometric method.The paper presents some results of estimation of uncertainties of the desorption rate Δp,determined in situ,by use of liquid manometric desorbometer gauge.It was observed that,if there are coal subgrains in desorbometer contaminator,the results of desorption rate may be even up to 60% higher than results obtained for the normative sample.Possibly method of the uncertainty reduction are presented in the paper as well.展开更多
Coal and gas outbursts are a mechanical dislocation process of a gas-logged and porous medium.The existence of the disturbed coal is a precondition of the outbursts. The study showed that the disturbedcoal and normal ...Coal and gas outbursts are a mechanical dislocation process of a gas-logged and porous medium.The existence of the disturbed coal is a precondition of the outbursts. The study showed that the disturbedcoal and normal coal are greatly different in mechanical and physical properties which decided the speeds of ultrasonic wave travelling in them. This paper presents a set of experimental measuring system and method.The resultal of measurements conducted in 60 min areas revealed quite different ultrasonic characteristics indifferent types of coal mass textures. Measuring the disturbed coal is a new way for predicting the outbursts.展开更多
Since the launch in June 2017,Insight-HXMT has been in service smoothly in orbit and particularly productive in 2023 and 2024.Among a total number of 238 papers published so far based on Insight-HXMT data,63 were publ...Since the launch in June 2017,Insight-HXMT has been in service smoothly in orbit and particularly productive in 2023 and 2024.Among a total number of 238 papers published so far based on Insight-HXMT data,63 were published in 2023,and 32 in the early 2024(till 2024 April),accounting for 40%of the total.These studies cover a variety of scientific subjects including the basic properties of black holes and neutron stars,the outburst of accreting black hole and neutron star X-ray binaries,thermal nuclear burst probes,isolated pulsars,quasi periodical oscillations,cyclotron resonant scattering features,fast radio bursts and gamma-ray bursts,etc.This paper introduces the overall progress with focus on some potential breakthroughs.展开更多
基金supported by a Grant from the Ministry of Science and Higher Education of Poland(NR09-0038-06,Poland)
文摘The paper presents some information about gas and coal outbursts threat in Polish coal mines.It shows the methodology for threat identification and monitoring for gas and coal outbursts in the Polish coal mines.One of the main methods of assessing threats in the mining industry in Poland and China is desorbometric method.The paper presents some results of estimation of uncertainties of the desorption rate Δp,determined in situ,by use of liquid manometric desorbometer gauge.It was observed that,if there are coal subgrains in desorbometer contaminator,the results of desorption rate may be even up to 60% higher than results obtained for the normative sample.Possibly method of the uncertainty reduction are presented in the paper as well.
文摘Coal and gas outbursts are a mechanical dislocation process of a gas-logged and porous medium.The existence of the disturbed coal is a precondition of the outbursts. The study showed that the disturbedcoal and normal coal are greatly different in mechanical and physical properties which decided the speeds of ultrasonic wave travelling in them. This paper presents a set of experimental measuring system and method.The resultal of measurements conducted in 60 min areas revealed quite different ultrasonic characteristics indifferent types of coal mass textures. Measuring the disturbed coal is a new way for predicting the outbursts.
基金Supported partially by the National Key R&D Program of China(2021YFA0718500)the National Natural Science Foundation(Grant No.12333007,12027803)International Partnership Program of Chinese Academy of Sciences(Grant No.113111KYSB20190020)。
文摘Since the launch in June 2017,Insight-HXMT has been in service smoothly in orbit and particularly productive in 2023 and 2024.Among a total number of 238 papers published so far based on Insight-HXMT data,63 were published in 2023,and 32 in the early 2024(till 2024 April),accounting for 40%of the total.These studies cover a variety of scientific subjects including the basic properties of black holes and neutron stars,the outburst of accreting black hole and neutron star X-ray binaries,thermal nuclear burst probes,isolated pulsars,quasi periodical oscillations,cyclotron resonant scattering features,fast radio bursts and gamma-ray bursts,etc.This paper introduces the overall progress with focus on some potential breakthroughs.
