The Quality factor is the parameter that can be used to describe the energy attenuation on seismic wave. In theory, we can obtain the relationship between the change of the coda wave quality factor with time and the s...The Quality factor is the parameter that can be used to describe the energy attenuation on seismic wave. In theory, we can obtain the relationship between the change of the coda wave quality factor with time and the strong earthquake preparation process on the basis of the quality factor of a coda wave in a same ray path. However, in reality the coda wave quality factor measured by different seismic coda waves corresponds to different seismic wave ray paths. The change of the quality factor with time is related to non-elastic characteristics of the medium and the volume of scattering ellipsoid constrained by scattered wave phase fronts, besides the change of regional stress field. This paper discusses the relationship between quality factor, epicenter distance and different lapse time, and then discusses the relationship between quality factor and frequency. Furthermore the determination method of the coda wave quality factor is put forward. The improved determination method of the quality factor, which removes the influence of different earthquakes or propagation depth of scattered waves, may increase measurement precision, thus information pertaining to abnormal changes in quality factor and the relationship between the quality factor and earthquake preparation process can be acquired.展开更多
Temporary mechanical circulatory support(tMCS)plays a pivotal role in managing severe or refractory cardiogenic shock(CS),furnishing essential hemodynamic support,and sustaining organ perfusion from hours to weeks,or ...Temporary mechanical circulatory support(tMCS)plays a pivotal role in managing severe or refractory cardiogenic shock(CS),furnishing essential hemodynamic support,and sustaining organ perfusion from hours to weeks,or to even months.In the past decade,the utilization of tMCS has witnessed a signicant increase in American and European countries.Meanwhile in Asia,the newly developed concepts and devices constituting tMCS have also made rapid progress.Nevertheless,the absence of a consensus or standardized guidelines,especially for the Asian population considering inherited polymorphism,is evident.To address this knowledge gap,eight associations/societies and experts in thiseld came up with the present consensus after repeated discussions,more specically for the Asian population.It comprehensively elucidates the commonly employed tMCS devices,criteria for patient selection,indications and contraindications,clinical management,and the optimal timing for implantation and weaning.The goal of this statement is to promote the standardized application of tMCS and make reasonable decisions in clinical practice.Full-length version of the consensus can be seen in Supplementary File,http://links.lww.com/CM9/B883.展开更多
THD(Take Hot Drilling)是一种创新的专利技术,意为钻井取热,该专利是一种在地热开采中有效提高产水量及保持温度的多通道系统,该多通道系统有效地增加了产水量,其核心思想是将不符合温度要求的多个含水层的水资源充分利用。这一技术通...THD(Take Hot Drilling)是一种创新的专利技术,意为钻井取热,该专利是一种在地热开采中有效提高产水量及保持温度的多通道系统,该多通道系统有效地增加了产水量,其核心思想是将不符合温度要求的多个含水层的水资源充分利用。这一技术通过引导这些水资源至井底,然后借助井壁进行加热升温,并与地下高温热水混合,最终通过出水通道将其抽出,该出水通道具备隔热保温的功能,有效减少地热水向地面输送的沿程温度损失,从而实现了保持温度和提升的双重目标。首次在某地热井中应用THD专利技术证实了该系统在提高地热开采效率方面的可靠性和有效性。此外,在出水通道方面仍存在改进和优化的潜力,有待进一步深度研究与分析探讨。总的来说,THD专利技术为地热(温泉)井开采提供了一项重要的技术保障手段,值得进一步验证和广泛推广应用。展开更多
基金sponsored by the Natural Science Foundation of Shandong Province (Y2007E09)Joint Earthquake Science Foundation (C08028)Special Application Research of Digital Seismic Wave Data ,Shangdong,China
文摘The Quality factor is the parameter that can be used to describe the energy attenuation on seismic wave. In theory, we can obtain the relationship between the change of the coda wave quality factor with time and the strong earthquake preparation process on the basis of the quality factor of a coda wave in a same ray path. However, in reality the coda wave quality factor measured by different seismic coda waves corresponds to different seismic wave ray paths. The change of the quality factor with time is related to non-elastic characteristics of the medium and the volume of scattering ellipsoid constrained by scattered wave phase fronts, besides the change of regional stress field. This paper discusses the relationship between quality factor, epicenter distance and different lapse time, and then discusses the relationship between quality factor and frequency. Furthermore the determination method of the coda wave quality factor is put forward. The improved determination method of the quality factor, which removes the influence of different earthquakes or propagation depth of scattered waves, may increase measurement precision, thus information pertaining to abnormal changes in quality factor and the relationship between the quality factor and earthquake preparation process can be acquired.
基金National Natural Science Foundation of China(Nos.81974034,81970396,81670351,and 82001701)National Key Research and Development Program(No.2021YFA 1101900)
文摘Temporary mechanical circulatory support(tMCS)plays a pivotal role in managing severe or refractory cardiogenic shock(CS),furnishing essential hemodynamic support,and sustaining organ perfusion from hours to weeks,or to even months.In the past decade,the utilization of tMCS has witnessed a signicant increase in American and European countries.Meanwhile in Asia,the newly developed concepts and devices constituting tMCS have also made rapid progress.Nevertheless,the absence of a consensus or standardized guidelines,especially for the Asian population considering inherited polymorphism,is evident.To address this knowledge gap,eight associations/societies and experts in thiseld came up with the present consensus after repeated discussions,more specically for the Asian population.It comprehensively elucidates the commonly employed tMCS devices,criteria for patient selection,indications and contraindications,clinical management,and the optimal timing for implantation and weaning.The goal of this statement is to promote the standardized application of tMCS and make reasonable decisions in clinical practice.Full-length version of the consensus can be seen in Supplementary File,http://links.lww.com/CM9/B883.
文摘THD(Take Hot Drilling)是一种创新的专利技术,意为钻井取热,该专利是一种在地热开采中有效提高产水量及保持温度的多通道系统,该多通道系统有效地增加了产水量,其核心思想是将不符合温度要求的多个含水层的水资源充分利用。这一技术通过引导这些水资源至井底,然后借助井壁进行加热升温,并与地下高温热水混合,最终通过出水通道将其抽出,该出水通道具备隔热保温的功能,有效减少地热水向地面输送的沿程温度损失,从而实现了保持温度和提升的双重目标。首次在某地热井中应用THD专利技术证实了该系统在提高地热开采效率方面的可靠性和有效性。此外,在出水通道方面仍存在改进和优化的潜力,有待进一步深度研究与分析探讨。总的来说,THD专利技术为地热(温泉)井开采提供了一项重要的技术保障手段,值得进一步验证和广泛推广应用。
