Abstract Depth estimation of potential field data is a powerful tool for geologic source interpretation. It can be implemented by using downward continuation method based on normalized algorithm. However, when several geological bodies with different burial depths exist in the research area, calculated depth usually tends to average depth. To overcome this limitation, we proposed new relationsh...

Wave-equation migration velocity analysis is based on the linear relation that can be established between a perturbation in the migrated image and the corresponding perturbation in the slowness function. Our method formulates an objective function in the image space, in contrast with other wave-equation tomography techniques which formulate objective functions in the data space. We iteratively ...

We study the implications for optimal monetary policy when declining nominal wages is not a viable margin for adjustment to adverse economic conditions. To this end, we develop a New Keynesian model where downward nominal wage rigidity arises endogenously. We show that the optimal policy response to changing economic conditions is asymmetric. Another important finding is that downward nominal r...

A systematic framework is presented for solving algebraic equations arising in geometric constraint solving. The framework has been used successfully to solve a family of spatial geometric constraint problems. The approach combines geometric reasoning, symbolic reduction, and homotopy continuation.

Among the properties of homogeneity of incidence structures flagtransitivity obviously is a particularly important and natural one. Consequently, in the last decades flag-transitive Steiner t-designs (i.e. flag-transitive t-(v, k, 1) designs) have been investigated, whereas only by the use of the classification of the finite simple groups has it been possible in recent years to essentially char...

The paper is a continuation of work initiated by the first two authors in [K–M]. Section 1 is introductory. In Section 2 we give new proofs of results of Scheiderer in [S1] [S2] in the compact case; see Corollaries 2.3, 2.4 and 2.5. The main tool in Section 2, Lemma 2.1, is also used in Section 3 where we continue the examination of the case n = 1 initiated in [K–M], concentrating on the compac...

An improved theoretical model for shielding of thermal radiation from large-scale fires using pure water or seawater mists is presented. It a continuation recent study and takes into account both the reabsorption in absorption bands gases variations radiative flux along flame. The combined heat transfer problem consists transfer, droplet evaporation kinetics, convective curtain. Previously sugg...