Yan Q.-W.,Beijing Information Science and Technology University |
Yan Q.-W.,National Institute for Occupational Safety |
Yan Q.-W.,Beijing University of Posts and Telecommunications |
Zhang F.-X.,Beijing Information Science and Technology University |
And 6 more authors.
Zhongguo Guanxing Jishu Xuebao/Journal of Chinese Inertial Technology | Year: 2012
A non-driven structure silicon micro-machined gyro was introduced for the signal-channel control of rotating aircraft. The gyro used the roll of rotating aircraft as a drive, and sensed the transverse angular rate in any direction. The gyro shock test results show that gyro shock-response signal has large amplitude and band width. In practical application, the amplitude above 1.5 V and the width above 100 ms have the ability to block the control signal channel of the rotating aircraft, and affect the normal flight. The analysis on the causes of the shock-response signal shows that the pendulum of gyro deflects about the torsion girder when it is shocked in its thickness direction due to its mass eccentricity. The method of increasing the thickness of the torsion girder of gyroscope was presented to reduce the deflection angle of pendulum under unit shock acceleration. The experiment results show that thickening the torsion girder from 48 μm to75 μm can reduce both the amplitude and width of shock-response signal by about 18 times.
Wang C.,Xi'an University of Science and Technology |
Li S.,Xi'an University of Science and Technology |
Liu J.,Xi'an University of Science and Technology |
Qin Y.,China University of Mining and Technology |
Shen Z.,National Institute for Occupational Safety
Progress in Mine Safety Science and Engineering II - Proceedings of the 2nd International Symposium of Mine Safety Science and Engineering | Year: 2014
In order to investigate the effect of coal particle size on gas desorption and diffusion law at constant temperature, the constant temperature dynamic coal particle gas adsorption and desorption experiment with different particle sizes was conducted in the coal gas adsorption and desorption experiment system. The results suggest that gas desorption laws of different particle size of coal samples show a good consistency at different pressures, and the cumulative desorption of gas coal particle is linear with time. For the same particle, the higher the initial pressure, the more the maximum gas desorption; the smaller the coal particle is, the more quickly the gas desorption rate is at the same initial pressure. Then, the gas spherical flow mathematical model is built based on Darcy law and is analysed with finite difference method. At last, the gas spherical flow mathematical model is constructed with Visual Basic. The contrast between numerical simulation and experimental results shows that the gas flow in the coal particle internal micropore accords with Darcy's law. © 2014 Taylor & Francis Group.
PubMed | National Institute for Occupational Safety, RUDN University, Orenburg State University, Yaroslavl State University and All Russian Research Institute of Medicinal and Aromatic Plants VILAR
Type: | Journal: Environmental science and pollution research international | Year: 2016
The objective of the investigation is comparative analysis of hair trace element content in workers of different departments of petrochemical plant. A total of 75 men working in office (engineers), and departments 1 (D
Xu J.-D.,North China Institute of Science and Technology |
Xu J.-D.,Beijing Institute of Technology |
Zhang L.-C.,North China Institute of Science and Technology |
Li T.-F.,National Institute for Occupational Safety |
Yang G.-Y.,North China Institute of Science and Technology
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2012
Tramcars are used as transport equipment, especially in the central area of a mine. As obstacles in the cloud of pre-mixed gas, they produce stimulating effect during the methane explosion accidents in coal mining. Based on conditions of coal mining process, a set of models is built for the numerical simulation. The chemical reaction mechanism, thermodynamics of explosion and elementary reaction are taken into consideration in the simulation. The TVD scheme is used for numerical discretization. The result shows the changes of shock wave and fire flame because of the influence of 1 to 3 tramcars. By comparison with previous experimental results, the conclusion is that the stimulating effect will be enhanced with the increase of the number of tramcars. The result will be helpful for the gas explosion prevention, emergency response and rescue, and incident investigation in coal mines.
He G.-J.,National Institute for Occupational Safety |
Ruan G.-Q.,Yanzhou Coal Mining Company Ltd
Meitan Xuebao/Journal of the China Coal Society | Year: 2011
Based on the characteristics of Zhaolou Coal Mine, analyzed the condition of heat sources at open face, heading face and stope face, and also studied the prevention and control measures against the heat disaster from mine construction to mine production in Zhaolou Coal Mine. The research shows that the open face and heading face are mainly in wall rock radiating, coal face is mainly in electrical equipment and hot-water radiating. Considering from mining design, radiation equipment, operating method and personal protection, Zhaolou Coal Mine used all possible ways such as separate ventilation, mechanical radiation, descensional ventilation, reducing working time and make up brine to control the heat disaster from mine construction to mine production. During the coal mine construction period and transitional period, Zhaolou Coal Mine used some refrigeration technology, such as "ground cooling station-spray equipment to cool wind in mine plenum-cooling the ventilation face/ventilation system" and set up a cooling chamber at the parking place of underground mine to centralized refrigeration. All of these get a good cooling result.
Nie B.,China University of Mining and Technology |
Nie B.,Beijing Institute of Technology |
Lu H.,China University of Mining and Technology |
Li X.,China University of Mining and Technology |
And 3 more authors.
Disaster Advances | Year: 2013
Coal is the most important energy resource in China and accounts for 74% of China's primary energy consumption. Gas explosion is one of the most severe accidents in coal mine. In order to analyze the effect of foam ceramics suppressing gas explosion, laws of two kinds of foam ceramics - Al2O3 and SiC affecting gas explosion are studied in the gas explosion experiment system. The structure of the foam ceramics is tested and the mechanism of their suppressing gas explosion is analyzed. The experimental results show that foam ceramics has a significant attenuation of overpressure and propagation speed of gas explosion. The foam ceramics can absorb the energy of gas explosion but the effect is varied as Al2O3 ceramics performs better. The meso-structure of foam ceramics is obtained by digital microscope. The results suggest that foam ceramics is a kind of cellular material and the pore canals have a good connectivity, so the explosion flame can be quenched and the heat can be consumed by reflecting and refracting and the propagation speed of the transverse wave can be weakened. The process of foam ceramics adsorbing heat has been analyzed. The foam ceramics can terminate the process of the transmission of heat so the energy of gas explosion can be absorbed. The findings provide a new method for suppressing gas explosion in coal mines, especially multiple and continuous gas explosion.
Shu Y.-B.,University of Science and Technology Beijing |
Li P.-L.,National Institute for Occupational Safety |
Li Z.-X.,University of Science and Technology Beijing
Advanced Materials Research | Year: 2012
An assessment approach in regard to tailings dam break would be analyzed and established in aspects of life, property and environment & resources loss in the essay. Tailings bam break hits local social economy varying with region as a result of particular and specialized space diversity. With the simple and practicable approach, it is quite reasonable to accomplish quantitative assessment of risk as well as review controlling priority to potential risk arising from tailings reservoir. © (2012) Trans Tech Publications, Switzerland.