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Additional resources for Companion to Concrete Mathematics: Vol. I: Mathematical Techniques and Various Applications (Pure and Applied Mathematics Series)

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The use of these terms is not intended to he definitive, but merely a convenient device to distinguish between two broad categories of measurements. In-Situ Measurements Some change or degradation in sample properties occurs when a sample is removed from its natural setting. In-situ measurements provide a means of in-place, non-destructive measurement and sometimes offer a more reliable mode of measurement than methods which require removal of a sample. Geophysical techniques provide the capabilities for such in-situ measurement of various physical and electrical properties under certain conditions.

Speeds as slow as 0 . 5 km/h are commonly used: This allows a greater number of radar signals to be transmitted and received per unit distance. At a traverse speed of 1 km/h, radar sampling density may yield up to 187 samples/meter (at 1 mi/h, 3 5 samples per foot). In operation an appropriate time window (range) of the system is selected. The range is measured in units of nanoseconds (1 nanosecond = loe9 seconds). An estimate of the radar wave's travel time (velocity) is made based upon what is known about site conditions.

Ground penetrating radar is used to detect natural geohydrologic conditions and the presence of both natural and man-made anomalous conditions. Of the contemporary geophysical methods, radar is one of the most effective and impressive; it offers the capability of continuous profiling information at speeds up to several miles per hour. Its performance, however, is highly site-specific and is limited to investigation at shallow depths. o Electromagnetics allows measurement of subsurface electrical conductivities.

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