HLS-Ⅱ(Hefei Light Source-Ⅱ)是以真空紫外和软X射线为主的专用同步辐射光源,其历史数据的检索速度对于性能分析和故障诊断至关重要,因此设计并开发了基于HBase的数据存档与检索系统(HBase-base Data Archiving and Retrieving System...HLS-Ⅱ(Hefei Light Source-Ⅱ)是以真空紫外和软X射线为主的专用同步辐射光源,其历史数据的检索速度对于性能分析和故障诊断至关重要,因此设计并开发了基于HBase的数据存档与检索系统(HBase-base Data Archiving and Retrieving System,HDARS),以提高历史数据的检索速度。HDARS中设计了一个数据抽取算法在存档过程中以不同的时间粒度抽取原始数据中的特征数据。原始数据和特征数据分别存入到HBase的原始数据表和冗余数据表中,当查询长期的历史数据时,HDARS将根据查询数据的时间范围来计算合适的时间粒度,并从冗余数据表中检索、返回具有此粒度的特征数据。该系统自投入运行以来,性能稳定,可以在1 s内响应任意时间范围的查询请求,完全满足了用户对HLS-Ⅱ历史数据查询需求。这种设计以较小的冗余存储空间为代价,完全解决了长期历史数据检索速度慢的问题。展开更多
To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining,the roof fracture structural model and mechanical model were deve...To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining,the roof fracture structural model and mechanical model were developed using numerical simulation and theoretical analysis.The roof fracture characteristics of a repeated mining face were revealed and the ground pressure law and roof supporting conditions of the repeated mining face were obtained.The results indicate that when the repeated mining face passes the residual pillars,the sudden instability causes fracturing in the main roof above the old goaf and forms an extra-large rock block above the mining face.A relatively stable ‘‘Voussoir beam" structure is formed after the advance fracturing of the main roof.When the repeated mining face passes the old goaf,as the large rock block revolves and touches gangue,the rock block will break secondarily under overburden rock loads.An example calculation was performed involving an integrated mine in Shanxi province,results showed that minimum working resistance values of support determined to be reasonable were respectively 11,412 kN and 10,743 kN when repeated mining face passed through residual pillar and goaf.On-site ground pressure monitoring results indicated that the mechanical model and support resistance calculation were reasonable.展开更多
文摘HLS-Ⅱ(Hefei Light Source-Ⅱ)是以真空紫外和软X射线为主的专用同步辐射光源,其历史数据的检索速度对于性能分析和故障诊断至关重要,因此设计并开发了基于HBase的数据存档与检索系统(HBase-base Data Archiving and Retrieving System,HDARS),以提高历史数据的检索速度。HDARS中设计了一个数据抽取算法在存档过程中以不同的时间粒度抽取原始数据中的特征数据。原始数据和特征数据分别存入到HBase的原始数据表和冗余数据表中,当查询长期的历史数据时,HDARS将根据查询数据的时间范围来计算合适的时间粒度,并从冗余数据表中检索、返回具有此粒度的特征数据。该系统自投入运行以来,性能稳定,可以在1 s内响应任意时间范围的查询请求,完全满足了用户对HLS-Ⅱ历史数据查询需求。这种设计以较小的冗余存储空间为代价,完全解决了长期历史数据检索速度慢的问题。
基金the National Basic Research Program of China (No.2014CB046905)Innovation Project for Graduates in Jiangsu Province (No.KYLX15_1405)+1 种基金the National Natural Science Foundation of China (Nos.51274191 and 51404245)the Doctoral Fund of Ministry of Education of China (No.20130095110018)
文摘To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining,the roof fracture structural model and mechanical model were developed using numerical simulation and theoretical analysis.The roof fracture characteristics of a repeated mining face were revealed and the ground pressure law and roof supporting conditions of the repeated mining face were obtained.The results indicate that when the repeated mining face passes the residual pillars,the sudden instability causes fracturing in the main roof above the old goaf and forms an extra-large rock block above the mining face.A relatively stable ‘‘Voussoir beam" structure is formed after the advance fracturing of the main roof.When the repeated mining face passes the old goaf,as the large rock block revolves and touches gangue,the rock block will break secondarily under overburden rock loads.An example calculation was performed involving an integrated mine in Shanxi province,results showed that minimum working resistance values of support determined to be reasonable were respectively 11,412 kN and 10,743 kN when repeated mining face passed through residual pillar and goaf.On-site ground pressure monitoring results indicated that the mechanical model and support resistance calculation were reasonable.
