Potential field data are of great significance to the study geological characteristics. Downward continuation potential converts from a high plane low plane. Since this method is mathematically an inverse problem solution, it unstable. The Tikhonov regularization strategy effective means downward field. However, achieving high-precision requirements in stage precise geophysical exploration stil...

We study the expressive power of the downward and vertical fragments of XPath equipped with (in)equality tests over data trees. We give necessary and sufficient conditions for a class of pointed data trees to be definable by a set of formulas or by a single formula of each of the studied logics. To do so, we introduce a notion of saturation, and show that over saturated data trees bisimulation ...

BACKGROUND Tonic inward and downward deviation of the eyes ("peering at the tip of the nose") is regarded as a unique feature of thalamic hemorrhage, but the mechanisms of this ocular finding remain obscure. OBJECTIVES To describe 4 patients who showed tonic inward and downward deviation of the eyes from brainstem or thalamic lesions and to discuss the possible mechanisms involved. DESIGN C...

Thepresentpaper reviews thecontemporary stateofdefinitionand theoryof thegeoid. Key features are: quasigeoid, externalgravitational field from satellites and its analytical downward continuation to the Earth's interior, data combination by least-squares collocation, and a new view of gravity reduction. This is done under the modern systematic perspective provided by the possibility of a purely ...

REASONS FOR PERFORMING STUDY Lungeing is commonly used as part of standard lameness examinations in horses. Knowledge of how lungeing influences motion symmetry in sound horses is needed. OBJECTIVES The aim of this study was to objectively evaluate the symmetry of vertical head and pelvic motion during lungeing in a large number of horses with symmetric motion during straight line evaluation....

The sonar beam of an echolocating bat forms a spatial window restricting the echo information returned from the environment. Investigating the shape and orientation of the sonar beam produced by a bat as it flies and performs various behavioral tasks may yield insight into the operation of its sonar system. This paper presents recordings of vertical and horizontal cross sections of the sonar be...

SUMMARY The purpose of marine seismic experiments is to provide information the structure and physical properties subsurface. P-wave velocity distribution most commonly modelled property, usually by inversion arrival times or waveform attributes. In wide-angle reflection/refraction (WAS) experiments, phases identified in data recorded ocean bottom seismometers (OBS) are used image relatively de...