The origins and main control methods of gas in coal seams were introduced cursorily, and the processes that need to be done in controlling gas, which includes prediction of gas emissions, drainage systems, the means o...The origins and main control methods of gas in coal seams were introduced cursorily, and the processes that need to be done in controlling gas, which includes prediction of gas emissions, drainage systems, the means of prevention of gas outbursts, and some suggestions were put forward. The characteristic of different gas emissions and the corresponding counter measures were presented, and ＆ case study of simultaneous extraction of coal and gas in Xieyi Coal Mine was carried out by coal mining and gas extraction without coal-pillar. The field application shows that gas drainage ratio in panel 5121（0） averages about 90% and reaches as high as 95~/0, which will give beneficial references to gas control in coal mines.展开更多
The dynamic reconfiguration technique based on field-programmable gate array （FPGA） can improve the resource utilization. Discussed are the dynamic reconfiguration principles and methods. Proposed is a remote dynami...The dynamic reconfiguration technique based on field-programmable gate array （FPGA） can improve the resource utilization. Discussed are the dynamic reconfiguration principles and methods. Proposed is a remote dynamic reconfiguration scheme using Xilinx Virtex-Ⅱ FPGA and SMCS Ethernet Physical layer transceiver（PHY）. The hardware of the system is designed with Xilinx Virtex-U XC2V30P FPGA that embedds MicroBlaze and MAC IP core, and its network communication software based on transmission control protoeol/Internet protocol （TCP/IP） protocol is programmed by loading LwIP to MicroBlaze. The experimental results indicate that the remote FPGA dynamic reconfiguration system（RFDRS） can switch freely in the eight lighting modes of light emitting diodes （LED）, and that, using dynamic reconfiguration technology, FPGA resource utilization can be reduced remarkably, which is advantageous in the system upgrade and software update.展开更多
文摘The origins and main control methods of gas in coal seams were introduced cursorily, and the processes that need to be done in controlling gas, which includes prediction of gas emissions, drainage systems, the means of prevention of gas outbursts, and some suggestions were put forward. The characteristic of different gas emissions and the corresponding counter measures were presented, and ＆ case study of simultaneous extraction of coal and gas in Xieyi Coal Mine was carried out by coal mining and gas extraction without coal-pillar. The field application shows that gas drainage ratio in panel 5121（0） averages about 90% and reaches as high as 95~/0, which will give beneficial references to gas control in coal mines.
基金Science and Technology Innovation Fund of Tianjin(06FZZDGX01800)
文摘The dynamic reconfiguration technique based on field-programmable gate array （FPGA） can improve the resource utilization. Discussed are the dynamic reconfiguration principles and methods. Proposed is a remote dynamic reconfiguration scheme using Xilinx Virtex-Ⅱ FPGA and SMCS Ethernet Physical layer transceiver（PHY）. The hardware of the system is designed with Xilinx Virtex-U XC2V30P FPGA that embedds MicroBlaze and MAC IP core, and its network communication software based on transmission control protoeol/Internet protocol （TCP/IP） protocol is programmed by loading LwIP to MicroBlaze. The experimental results indicate that the remote FPGA dynamic reconfiguration system（RFDRS） can switch freely in the eight lighting modes of light emitting diodes （LED）, and that, using dynamic reconfiguration technology, FPGA resource utilization can be reduced remarkably, which is advantageous in the system upgrade and software update.
