A Finite-difference method for simulation of sonic waves propagating in a vicinity of a borehole filled with fluid and surrounded by a 3D heterogeneous elastic medium is developed. The method utilizes an explicit second order of approximation FD scheme on staggered grids that approximates the elastodynamic system of equations in cylindrical coordinates. A… (More)
4 This paper presents a problem-oriented approach, designed for numerical simulation of seismic wave propagation in models containing geological formations with complex properties such as anisotropy, attenuation, and small-scale heterogeneities. Each of the named property requires special treatment which increases computational complexity of the algorithm… (More)
In order to simulate the interaction of seismic waves with cavernous/fractured reservoirs, a finite-difference technique based on locally refined time-and-space grids is used. The need to use these grids is due primarily to the differing scale of heterogeneities in the reference medium and the reservoir. Domain Decomposition methods allow for the separation… (More)
Quality of life in patients with cardiological syndrome X (XS) and ischemic heart disease (IHD) assessed with Nottingham Health Profile questionnaire was compared to that shown by exercise tests. Compared to IHD patients, those with XS have worse quality of life. This is explained by a lower pain threshold and, consequently, lower exercise tolerance.
Industrial robots have greatly enhanced the performance of automated manufacturing processes during the last decades. International competition, however, creates an increasing demand to further improve both the accuracy of oo-line programming and the resulting cycle times on production lines. To meet these objectives, validated dynamic robot models are… (More)