The vector transformation and pole reduction from the total-field anomaly are signifi cant for the interpretation.We examined these industry-standard processing procedures in the Fourier domain.We propose a novel iter...The vector transformation and pole reduction from the total-field anomaly are signifi cant for the interpretation.We examined these industry-standard processing procedures in the Fourier domain.We propose a novel iteration algorithm for regional magnetic anomalies transformations to derive the vertical-component data from the total-field measurements with the variation in the core-fi eld direction over the region.Additionally,we use the same algorithm to convert the calculated vertical-component data into the corresponding data at the pole and realize the processing of diff erential reduction to the pole(DRTP).Unlike Arkani-Hamed’s DRTP method,the two types of iterative algorithms have the same forms,and DRTP is realized by implementing this algorithm twice.The synthetic model’s calculation results show that the method has high accuracy,and the fi eld data processing confi rms its practicality.展开更多
On July 22, 2013, the Minxian-Zhangxian Ms6. 6 earthquake occurred on the east segment of Lintan-Dangchang fault. The analysis of digital elevation and remote sensing imaging shows that the east segment of Lintan-Dang...On July 22, 2013, the Minxian-Zhangxian Ms6. 6 earthquake occurred on the east segment of Lintan-Dangchang fault. The analysis of digital elevation and remote sensing imaging shows that the east segment of Lintan-Dangchang fault is still active and the main thrust feature of the fault switches to left lateral slip. With the field research of intensity and damage, several abnormal areas of degree VIII spread in the isoseismal line of degree VII and some abnormal areas of degree VII spread in the isoseismal line of degree VI. These abnormal areas are distributed along the hanging wall of the fault in a width of 2km. The analysis based on the remote sensing and digital elevation model shows that the segment of the Lintan-Dangchang fault south of Minxian mainly slips in left literal. The fault movement made the soil soft in the fault zone. The earthquake motion propagated along the fault zone. Therefore the strong earthquake motion caused foundation failure in the soft soil along the fault zone and the abnormal intense areas of disaster formed.展开更多
Within the model, a definition of novel saturation and dilution degree is presented. A novel expression of equilibrium constant is derived by including interactions between components to reversible processes running b...Within the model, a definition of novel saturation and dilution degree is presented. A novel expression of equilibrium constant is derived by including interactions between components to reversible processes running between the components particles under a dynamic equilibrium. For partition equilibria, three types of basic processes are proposed and corresponding partition isotherms were derived. The isotherms are applied to the components partition between two phases for main heterogenous systems types. For construction and prediction ternary phase diagrams, a new method, the Component Binding by Saturation Model （CBSM） method, is proposed. Applying the partition isotherms derived, new extraction, evaporation and adsorption isotherms are expressed. Directly, or after an approximation, from the new adsorption isotherms, well-known adsorption isotherms are obtained.展开更多
在生产环境下油管泄漏异常极少发生,并且人为调整泵频率、仪表校准等带来的监测数据曲线突变,即假异常,混淆在真异常中难以被区分,导致传统基于机器学习的泄漏异常识别方法召回率较低,误报率较高。针对该问题,提出一种基于真假异常区分...在生产环境下油管泄漏异常极少发生,并且人为调整泵频率、仪表校准等带来的监测数据曲线突变,即假异常,混淆在真异常中难以被区分,导致传统基于机器学习的泄漏异常识别方法召回率较低,误报率较高。针对该问题,提出一种基于真假异常区分的输油管道泄漏异常识别方法,利用一类支持向量机(One-Class Support Vector Machine,OCSVM)学习输油管道的正常工作模式,并利用该模式筛出管道的疑似异常,即真假异常。通过叠加多源数据的方式增加真假异常曲线形态差异,并利用相似性聚类发现泄漏事件的异常模式。将该方法应用到中国西北某老工业采油井场输油生产环境中进行验证,结果表明:泄漏异常识别召回率为100%,假异常排除率达到83.49%。该方法实现了在复杂生产环境中对输油管道泄漏异常事件的实时、高效监测,并为机器学习方法应用于生产环境提供了实践思路。(图8,表4,参28)展开更多
CHAMP satellite data and ground-based magnetic observations are used and combined to map the lithospheric magnetic field over China by means of the revised spherical cap harmonic analysis(R-SHCA)modeling technique.The...CHAMP satellite data and ground-based magnetic observations are used and combined to map the lithospheric magnetic field over China by means of the revised spherical cap harmonic analysis(R-SHCA)modeling technique.The magnetic field is described to a spatial resolution of 150 km at the mean Earth’s radius,which represents a good compromise between the resolutions afforded by surface and satellite data.We compare the magnetic anomalies modeled at the regional scale with composite regions containing large-scale of tectonic structures.These regions,including the Tarim Basin and the Tibetan Plateau,are correlated with regional magnetic anomalies at satellite altitude but contain a significant number of small-scale and complex magnetic structures at the mean Earth’s radius.These magnetic anomalies are globally consistent with the known geological features in China but also offer a way to delineate the contours of the geological blocks and to discuss the connection between magnetic anomalies and the heat flow distribution in this region.展开更多
基金supported by the National Key R&D Program of China (No. 2017YFC0602000)the China Geological Survey Project (Nos. DD20191001 and DD20189410)。
文摘The vector transformation and pole reduction from the total-field anomaly are signifi cant for the interpretation.We examined these industry-standard processing procedures in the Fourier domain.We propose a novel iteration algorithm for regional magnetic anomalies transformations to derive the vertical-component data from the total-field measurements with the variation in the core-fi eld direction over the region.Additionally,we use the same algorithm to convert the calculated vertical-component data into the corresponding data at the pole and realize the processing of diff erential reduction to the pole(DRTP).Unlike Arkani-Hamed’s DRTP method,the two types of iterative algorithms have the same forms,and DRTP is realized by implementing this algorithm twice.The synthetic model’s calculation results show that the method has high accuracy,and the fi eld data processing confi rms its practicality.
基金supported by basic scientific research operating expenses of Institute of Earthquake Science,China Earthquake Administration(2012IES010202)
文摘On July 22, 2013, the Minxian-Zhangxian Ms6. 6 earthquake occurred on the east segment of Lintan-Dangchang fault. The analysis of digital elevation and remote sensing imaging shows that the east segment of Lintan-Dangchang fault is still active and the main thrust feature of the fault switches to left lateral slip. With the field research of intensity and damage, several abnormal areas of degree VIII spread in the isoseismal line of degree VII and some abnormal areas of degree VII spread in the isoseismal line of degree VI. These abnormal areas are distributed along the hanging wall of the fault in a width of 2km. The analysis based on the remote sensing and digital elevation model shows that the segment of the Lintan-Dangchang fault south of Minxian mainly slips in left literal. The fault movement made the soil soft in the fault zone. The earthquake motion propagated along the fault zone. Therefore the strong earthquake motion caused foundation failure in the soft soil along the fault zone and the abnormal intense areas of disaster formed.
文摘Within the model, a definition of novel saturation and dilution degree is presented. A novel expression of equilibrium constant is derived by including interactions between components to reversible processes running between the components particles under a dynamic equilibrium. For partition equilibria, three types of basic processes are proposed and corresponding partition isotherms were derived. The isotherms are applied to the components partition between two phases for main heterogenous systems types. For construction and prediction ternary phase diagrams, a new method, the Component Binding by Saturation Model （CBSM） method, is proposed. Applying the partition isotherms derived, new extraction, evaporation and adsorption isotherms are expressed. Directly, or after an approximation, from the new adsorption isotherms, well-known adsorption isotherms are obtained.
文摘在生产环境下油管泄漏异常极少发生,并且人为调整泵频率、仪表校准等带来的监测数据曲线突变,即假异常,混淆在真异常中难以被区分,导致传统基于机器学习的泄漏异常识别方法召回率较低,误报率较高。针对该问题,提出一种基于真假异常区分的输油管道泄漏异常识别方法,利用一类支持向量机(One-Class Support Vector Machine,OCSVM)学习输油管道的正常工作模式,并利用该模式筛出管道的疑似异常,即真假异常。通过叠加多源数据的方式增加真假异常曲线形态差异,并利用相似性聚类发现泄漏事件的异常模式。将该方法应用到中国西北某老工业采油井场输油生产环境中进行验证,结果表明:泄漏异常识别召回率为100%,假异常排除率达到83.49%。该方法实现了在复杂生产环境中对输油管道泄漏异常事件的实时、高效监测,并为机器学习方法应用于生产环境提供了实践思路。(图8,表4,参28)
基金supported by National Natural Science Foundation of China(Grant Nos.4117412240890163&41031066)OPWSRP(Grant No.201005017)
文摘CHAMP satellite data and ground-based magnetic observations are used and combined to map the lithospheric magnetic field over China by means of the revised spherical cap harmonic analysis(R-SHCA)modeling technique.The magnetic field is described to a spatial resolution of 150 km at the mean Earth’s radius,which represents a good compromise between the resolutions afforded by surface and satellite data.We compare the magnetic anomalies modeled at the regional scale with composite regions containing large-scale of tectonic structures.These regions,including the Tarim Basin and the Tibetan Plateau,are correlated with regional magnetic anomalies at satellite altitude but contain a significant number of small-scale and complex magnetic structures at the mean Earth’s radius.These magnetic anomalies are globally consistent with the known geological features in China but also offer a way to delineate the contours of the geological blocks and to discuss the connection between magnetic anomalies and the heat flow distribution in this region.
