A method is described of measuring radiological subsidence of a femoral prosthesis in relation to the femur after total hip arthroplasty. The method depends on measuring the distance from the tip of the femoral prosthesis to a fixed point in the bone. Subsidence after the use of a conventional design of femoral stem is compared with that after the use of a stem with a dorsal flange (Cobra). A s...

We analyzed twenty three satellite SAR (Synthetic Aperture Radar) scenes using Persistent Scatter Interferometry (PSI) to study subsidence in Mexico City associated with groundwater withdrawal. The data were acquired by the Envisat ASAR system between January 2004 and July 2006. The spatial pattern of subsidence and the maximum subsidence rate (300 mm/yr) are similar to earlier studies. Compari...

Executive Summary Based on the 2000 Record of Decision, an explicit goal of the California Bay-Delta Program is to stabilize and maintain the current configuration of channels and islands in the Delta. This effort is based on the conclusion that hydraulic integrity of the Delta is necessary for meeting water supply, water quality and ecosystem restoration objectives. Landscape level simulations...

This paper describes the results using data from ALOS and ENVISAT satellites for the purpose of subsidence monitoring over underground coal mine sites in the state of New South Wales, Australia, using the differential interferometric synthetic aperture radar (DInSAR) technique. The quality of the mine subsidence monitoring results is mainly constrained by the noise due to the spatial and tempor...

BACKGROUND Cemented stems show good long-term results and the survival of new implants can be predicted by their early subsidence. With EBRA-FCA (Femoral Component Analysis using Einzel-Bild-Röntgen-Analyse) early subsidence as an early indicator for later aseptic loosening can be analysed. For the cemented TwinSys stem mid- and long-term data is only avalible from the New Zeeland Arthroplasty ...

Peter W. Lipman U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, USA e-mail: [email protected] Abstract Diverse subsidence geometries and collapse processes for ash-flow calderas are inferred to reflect varying sizes, roof geometries, and depths of the source magma chambers, in combination with prior volcanic and regional tectonic influences. Based largely on a revie...

Subsidence of the Everglades Histosols occurs at a rate of approximately 3 cm/year. The major cause of this loss of soil is the oxidation of the organic matter by the microbial community. One of the products of this microbial activity is inorganic nitrogen. Assuming an annual subsidence rate of 3 cm, approximately 1400 kg/ha of nitrogen is released per year. Much of this nitrogen accumulates in...

Intertidal mud has buried extensive, well-vegetated lowlands in westernmost Washington at least six times in the past 7000 years. Each burial was probably occasioned by rapid tectonic subsidence in the range of 0.5 to 2.0 meters. Anomalous sheets of sand atop at least three of the buried lowlands suggest that tsunamis resulted from the same events that caused the subsidence. These events may ha...

To determine the degree of mining affection on surface or in strata, the GIS technique is used, with Mapinfo as the platform. Through programming of seam inclination-based subsidence mathematical models and mining disturbance analysis visualization, Mapbasic/Vc++/Vfortran programming design is realized under Windows. The program system provides not only an effective approach for model analysis,...