Search

Copyright of Journal of Hubei Open Vocational College is the property of Journal of Hubei Open Vocational College Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Mountain Research (10082786) is the property of Mountain Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunications Science is the property of Beijing Xintong Media Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The electromagnetic emission (EME) signal and the infrared radiation temperature signal from the deformation and fracture of composite coal-rock made up of roof rock,coal and floor rock have been collected by using a selfdeveloped EME signal acquisition system and a high precision infrared thermal imager. Also,the law of composite coalrock ' s elastic modulus and temperature in variation process were studied. Combined with the thermal damage and stress-electricity coupled model,the composite damage factor has been put forward. In addition, the study has established a stress-electricity-thermal coupled model of the loaded composite coal-rock. The experimental data has been fitted by means of tested composite coal-rock specimens. Model parameters m has been fitted by using the stress-electricity and stress-electricity-thermal coupled model of composite coal and rock specimens. The results show that the composite coal-rock' s elastic modulus and temperature show a negative correlation relationship. The multiple correlation coefficient is above 0. 9. The multiple correlation coefficient of established model is higher than the stress-electricity coupled model. The model' s accuracy has been improved by considering the thermal damage and revised model. [ABSTRACT FROM AUTHOR]

Variation of internal infrared radiation temperature of composite coal-rock fractured under load was studied. The composite coal-rock is composed of top slate,coal seam and floor rock. According to the experiment, the sandstone sample and coal sample were drilled at their centerin different directions respectively. The internal temperature of the sample was measured by infrared thermometer to study the infrared thermometer variation characteristics in the process of the loading deformation until the hole was cracked. The results show that there are thermoelastic effect and frictional heat effect during loading tests. The heat generated by the friction between the coal body and the fracture surface is significantly higher than that of the thermal elastic effect, resulting in a significant increase of 0.15 ℃. The thermoelastic effect of roof and floor sandstone plays a leading role,resulting in an increase of 0.04 ℃, 0.05 ℃ respectively. The interior of the coal, roof and floor sandstone infrared radiation temperature and strain, stress and temperature all have a strong linear positive correlation. [ABSTRACT FROM AUTHOR]