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Copyright of Guihaia is the property of Guihaia 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 Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology 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 marine-continent transitional mud shale in Upper Carboniferous Benxi Formation is a potential shale gas exploration target in the eastern Ordos Basin. Based on the systematic observation and sampling analysis of representative profiles and key well, the influencing factors and development pattern of organic-rich mud shale in Benxi Formation of Liulin-Zizhou area, the eastern Ordos Basin were studied, and the development pattern “slow subsidence, terrigenous organic matter supply, and enclosed preservation” of marine-continent transitional organic-rich mud shale was established. The results show that the organic-rich mud shale in Benxi Formation of Liulin-Zizhou area, the eastern Ordos Basin mainly belongs to Jinci and Pangou members, and the lithofacies is mainly clay mud shale with a small amount of siliceous mud shale; the abundance of organic matter is high, and the type is mainly humic; the coal-forming plants flourish in the region because of the hot and humid climate in Benxi depositional period, and result in an abundant supply of organic matter for the sedimentary water; the transgression occurs in the eastern Ordos Basin under the tectonic background of slow subsidence; the high salinity of anoxic water at the bottom maintains reduction environment in the barrier island-lagoon-neritic muddy shelf sedimentary system, which provides a favorable zone for the preservation and enrichment of sedimentary organic matter. [ABSTRACT FROM AUTHOR]

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui 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 Water Conservancy & Electric Power Technology & Application is the property of Omniscient Pte. 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.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences 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 Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management 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 Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction 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.)

At present, the main ventilation network solutions include loop method and node method. The node method has many advantages over the loop method, but it has not been widely used. On the one hand, the fan needs to rely on the nodes to be involved in the network, while the wind pressure description of the fan node and the construction of the node wind pressure equation are complex and difficult. On the other hand, the layout of mine roadways is large, and the combination of nodes and branches with special conditions is diversified, which lead to the difficulty in the construction process of the node wind pressure equation, and it is difficult to realize the algorithm in programming language. To overcome the above two problems, the theory of node method is analyzed and deduced, then the method of fan treatment and ventilation network modeling are proposed. Using C# language, the algorithm is implemented and the same numerical example is solved with different network models, and the result method is compared and verified with the loop method. The results prove that the method of fan treatment and ventilation network modeling in the research and development is feasible and can be widely applied, in particular, can deal with the complicated situation in underground mines. [ABSTRACT FROM AUTHOR]

In order to solve the data problem that is callable from CAD map to TF1M3D ventilation simulation, it is proposed to mark the structure of the system and all the ventilation information of the mine when drawing the single line map of the mine from the original CAD map. The roadway is expressed by solid line, which gives roadway elevation and connected relation in entity; air duct is expressed by polyline; resistance gate (i.e. air door, air window or adjusting door, etc.) and ventilator are expressed by circle, in which the resistance gate is identified by the least distance between the center of the circle and the roadway line according to the cosine theorem, captured at the end of the tunnel according to center of a circle to identify ventilator, the main fan is at the independent end. According to above rule, Matlab program TF1M3D_dataDXF.m that extracts the DXF file information of mine single line drawing is composed. The practical application indicates that mine roadway topological information and all ventilation parameters can be recognized by scanning the DXF file, filtering to find the symbol codes AcDbLine, AcDbText, AcDbCircle, to fast realize rapid modeling of three-dimensional mine roadway network and ventilation system, which can conduct seamless joint with TF1M3D calling requirements. [ABSTRACT FROM AUTHOR]

Aiming at the problem that the calculation of the heat and moisture exchange between the surrounding rock and the air flow is difficult to be realized in the whole mine domain system,a model of the airflow heat transfer coefficient of the wet roadway is put forward.According to the measured relative humidity of airflow in the field,the change law of the airflow humidity in the mine intake airflow is obtained.The model of the heat exchange between the airflow and the surrounding rock under the influence of water evaporation in the roadway is then determined by reverse deduction,and the heat transfer coefficient between the surrounding rock and the airflow is corrected.The variation law of airflow relative humidity in actual mines is described by the weighted distance of air volume.Based on the case study in Jiudaoling Mine,the algorithm is incorporated into the mine ventilation network system,and TF1M3D is used to simulate the airflow temperature of the whole mine domain system on MATLAB platform.Research shows that the water evaporation of the roadway has a great influence on the airflow temperature,and the airflow temperature in the main intake air shaft section is increased by 0.97℃,the variation range is not significant.With the increase of humidity,the variation of airflow temperature increases gradually.The results are in agreement with the measured results of the Jiudaoling Mine.The algorithm is included in the calculation of the network system,which can solve the problems of the temperature distribution simulation and the automatic calculation of the natural ventilation pressure in the thermal hazard prevention of the 3D mine model ventilation system. [ABSTRACT FROM AUTHOR]

In order to solve the serious secondary disasters of the gas overrun or gas explosion，which is caused by coal and gas outburst in mine，the equations of fluid transients，convection diffusion and source containing ventilation network were established to study the dynamic effect and gas migration process of gas outburst in mine ventilation system. In this paper，the gas migration process under the combined effect of gas outburst power and mine ventilation was investigated through the outburst dynamic experiment of ventilation network system. A simulation software NC2.0 of coal and gas outburst has been developed，and the “10·27” coal and gas outburst accident in Jiaozuo Jiulishan Coal Mine was simulated by NC2.0 software. Throughout the simulation process，the unsteady air flow and gas distribution in Jiulishan Coal Mine after gas outburst were simulated respectively by the fluid changing curve given. The results indicate that the outburst pressure after gas outburst is the main factor leading to airflow change，propagating by wave propagation. The high strength airflow changes the direction of air flow，increases the air volume in return airway，and decreases the air volume in intake airflow roadway at the same time，even leading to backflow. The research provides a theoretical basis for disaster prevention and control，reducing loss and preventing secondary disasters in outburst mines. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Dalian University of Technology / Dalian Ligong Daxue Xuebao is the property of Journal of Dalian University of Technology 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.)