In order to study stability control methods for a deep gate group under complex stresses,we conducted field investigations and analyses of reasons for damage in the Xuzhou mining district.Three reasons are proposed:de...In order to study stability control methods for a deep gate group under complex stresses,we conducted field investigations and analyses of reasons for damage in the Xuzhou mining district.Three reasons are proposed:deep high stress,improper roadway layout and support technology.The stability control countermeasures of the gate group consist of an intensive design technology and responding bolt-mesh-anchor truss support technology.Our research method has been applied at the -1000 m level gate group in Qishan Coal Mine.Suitable countermeasures have been tested by field monitoring.展开更多
By taking the Yong River for example in this paper, based on the multiple measured data during 1957 to 2009, the change process of runoff, tide feature, tidal wave, tidal influx and sediment transport are analyzed. Th...By taking the Yong River for example in this paper, based on the multiple measured data during 1957 to 2009, the change process of runoff, tide feature, tidal wave, tidal influx and sediment transport are analyzed. Then a mathematical model is used to reveal the influence mechanism on hydrodynamic characteristics and sediment transport of the wading engineering groups such as a tide gate, a breakwater, reservoirs, bridges and wharves, which were built in different periods. The results showed the hydrodynamic characteristics and sediment transport of the Yong River changed obviously due to the wading engineering groups. The tide gate induced deformation of the tidal wave, obvious reduction of the tidal influx and weakness of the tidal dynamic, decrease of the sediment yield of flood and ebb tide and channel deposition. The breakwater blocked estuarine entrances, resulting in the change of the tidal current and the reduction of the tidal influx in the estuarine area. The large-scale reservoirs gradually made the decrease of the Yong River runoff. The bridge and wharf groups took up cross-section areas, the cumulative affection of which caused the increase of tidal level in the tidal river.展开更多
针对群目标跟踪数据关联的特点以及多目标跟踪数据关联经典的联合概率数据关联算法存在的计算量大与假设条件苛刻等问题,提出了基于群目标的多目标概率数据关联算法GJPDA(Group-target joint probability data association)。该算法首...针对群目标跟踪数据关联的特点以及多目标跟踪数据关联经典的联合概率数据关联算法存在的计算量大与假设条件苛刻等问题,提出了基于群目标的多目标概率数据关联算法GJPDA(Group-target joint probability data association)。该算法首先把跟踪空间内的所有回波看作一个群,跟踪空间中任一关联门内的所有回波看作一个子群,通过关联门是否交叉、多少回波位于关联门交叉区内的判别及其相对于不同关联中心概率的计算,确定交叉区域内回波的归属。以每一个关联门内所有回波的等效回波为量测实现多群目标跟踪。仿真结果表明了该算法的有效性。展开更多
基金Projects 50490270 supported by the National Natural Science Foundation of ChinaProjects 2006CB202200 by the National Basic Research Program of ChinaProjects IRT0656 by the Innovation Term Project of the Ministry of Education of China
文摘In order to study stability control methods for a deep gate group under complex stresses,we conducted field investigations and analyses of reasons for damage in the Xuzhou mining district.Three reasons are proposed:deep high stress,improper roadway layout and support technology.The stability control countermeasures of the gate group consist of an intensive design technology and responding bolt-mesh-anchor truss support technology.Our research method has been applied at the -1000 m level gate group in Qishan Coal Mine.Suitable countermeasures have been tested by field monitoring.
基金financially supported by the National Science Foundation for Distinguished Young Scholars of China(Grant No.51125034)the National Natural Science Foundation of China(Grant Nos.51279046 and 50909037)the Fundamental Research Funds for the Central Universities(Grant No.2010B01114)
文摘By taking the Yong River for example in this paper, based on the multiple measured data during 1957 to 2009, the change process of runoff, tide feature, tidal wave, tidal influx and sediment transport are analyzed. Then a mathematical model is used to reveal the influence mechanism on hydrodynamic characteristics and sediment transport of the wading engineering groups such as a tide gate, a breakwater, reservoirs, bridges and wharves, which were built in different periods. The results showed the hydrodynamic characteristics and sediment transport of the Yong River changed obviously due to the wading engineering groups. The tide gate induced deformation of the tidal wave, obvious reduction of the tidal influx and weakness of the tidal dynamic, decrease of the sediment yield of flood and ebb tide and channel deposition. The breakwater blocked estuarine entrances, resulting in the change of the tidal current and the reduction of the tidal influx in the estuarine area. The large-scale reservoirs gradually made the decrease of the Yong River runoff. The bridge and wharf groups took up cross-section areas, the cumulative affection of which caused the increase of tidal level in the tidal river.
文摘针对群目标跟踪数据关联的特点以及多目标跟踪数据关联经典的联合概率数据关联算法存在的计算量大与假设条件苛刻等问题,提出了基于群目标的多目标概率数据关联算法GJPDA(Group-target joint probability data association)。该算法首先把跟踪空间内的所有回波看作一个群,跟踪空间中任一关联门内的所有回波看作一个子群,通过关联门是否交叉、多少回波位于关联门交叉区内的判别及其相对于不同关联中心概率的计算,确定交叉区域内回波的归属。以每一个关联门内所有回波的等效回波为量测实现多群目标跟踪。仿真结果表明了该算法的有效性。
