منابع مشابه
Instruments and Methods Improved method to determine radio-echo sounding reflector depths from ice-core profiles of permittivity and conductivity
We present a technique that modifies and extends down-hole target methods to provide absolute measures of uncertainty in radar-reflector depth of origin. We use ice-core profiles to model wave propagation and reflection, and then cross-correlate the model results with radio-echo sounding (RES) data to identify the depth of reflector events. Stacked traces recorded with RES near the EPICA drill ...
متن کاملRadio Echo Sounding of the Greenland Inland Ice
Radio echo sounding has been used for a number of years in the exploration of polar ice such as the inland ice in Greenland and Antarc tica. By means of this technique a number of important glaciological and geophysical parameters may be deter mined. Examples are ice thickness, bedrock topography and structure, stratification patterns which are used for climate and flow patterns studies, and ...
متن کاملInstrwnents and Methods Miniature high-power illlpulse transmitter for radio-echo sounding
We have developed a miniature high-power impulse transmitter for radio-echo sounding of glaciers. It features two synchronous second break-down pulse generators operating in a differential configuration. Specifications include bipolar 550 V pulses having rise times less than 2 ns, 512 Hz repetition rate, 180 mA at 10-14 V d.c. operating power, 5 mA standby current and maximum dimension of 12 cm...
متن کاملSounding Off
Networked communications accord the voice renewed spatial significance. How does the mobile phone influence the use and design of spaces? The conventions for modulating the voice in face-to-face exchanges are well established. But in the case of mobile communications the voice may be raised to abnormal levels. The raised voice overcomes ambient interference, and spatial distance. The voice is a...
متن کاملSounding Objects
virtual environments, and information display applications need dynamic sound models rather than faithful audio reproductions. This implies three levels of research: auditory perception, physicsbased sound modeling, and expressive parametric control. Parallel progress along these three lines leads to effective auditory displays that can complement or substitute visual displays. W hen designing ...
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ژورنال
عنوان ژورنال: Nature
سال: 1930
ISSN: 0028-0836,1476-4687
DOI: 10.1038/125893b0