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Split-beam positional estimates of fish detected in a river at close range often do not correspond to the actual position of the target. These inaccuracies create problems in determining whether a fish is moving upstream or downstream. We hypothesize that these positional estimates are degraded by two factors: size of target relative to beam diameter, and the complex scattering of the fish. These parameters create a near-field effect, within which the phase measurements of the returning echoes are corrupted. Examples of fish tracks from near and far range fish detected by a split-beam echo sounder are provided to illustrate these inaccuracies. Experimental data from tethered spheres and complex targets show increasing distortion with target complexity and proximity to the transducer.
Psychotomimetic drugs have been used increasingly in the past decade for facilitating psychotherapy, most experience being with lysergic acid diethylamide (LSD-25) (Sandison, 3; Savage, 4; Abramson, 1; Cohen, 2). Few attempts have been made to study experimentally their effects on therapeutic interviews, largely because of technical difficulties.
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