Method for fast line search in frequency domain FWI

    公开(公告)号:US09910189B2

    公开(公告)日:2018-03-06

    申请号:US14657962

    申请日:2015-03-13

    CPC classification number: G01V99/00 G06F17/12 G06F17/5009

    Abstract: Method for rapidly computing updates to frequency-domain seismic wave fields by utilizing a matrix perturbation approach. The method speeds up model (e.g., velocity) parameter estimation by iterative inversion of measured seismic data. The method applies to the line search where the optimal size of the model update is estimated by testing different size updates to see which one generates the minimum objective function. By treating the model update as a perturbation, perturbation theory is used to relate the model perturbation to a corresponding wavefield perturbation. Thus, the Helmholtz equation is solved only once per iteration cycle.

    System and method for controlling a temperature of oil in a power-plant of a vehicle

    公开(公告)号:US09896979B2

    公开(公告)日:2018-02-20

    申请号:US13032870

    申请日:2011-02-23

    CPC classification number: F01M5/021 F01M5/007

    Abstract: A system is provided for controlling a temperature of oil in a power-plant operable to propel a vehicle. The system includes a heat-exchanger arranged relative to the power-plant. The heat-exchanger is configured to receive the oil from the power-plant, modify the temperature of the oil, and return the modified temperature oil to the power-plant. The system also includes a valve configured to direct the oil through the heat-exchanger during a warm-up operation of the power-plant such that the temperature of the oil is increased. The valve is also configured to direct the oil to bypass the heat-exchanger during a low load operation of the power-plant such that the temperature of the oil is increased. Additionally, the valve is configured to direct the oil through the heat-exchanger during a high load operation of the power-plant such that the temperature of the oil is decreased.

    Recovery of regenerant electrolyte
    86.
    发明授权

    公开(公告)号:US09776137B2

    公开(公告)日:2017-10-03

    申请号:US12617250

    申请日:2009-11-12

    Inventor: Thomas A. Davis

    Abstract: Methods, systems and compositions for recovery of regenerant ions from spent regenerant solution by utilization of electrodialysis are provided. For example, in certain aspects methods for separating spent regenerant using an electrodialysis system comprising selective membranes are described. Furthermore, the invention provides methods for treating a friable solid ion-removal material to prevent fragmentation during regeneration.

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