For the second set-up consisted of connecting the high frequency output of a bat detector (frequency range: 8 100 kHz) to a high-speed analog-to-digital (A/D) card in a laptop (sampling frequency: 200 500 kHz) using the program NiDisk (for more details see Leliveld and colleagues [ 40]).
For the first we connected the high frequency output of a bat detector (U30, Ultra Sound Advice, frequency range: >100 kHz) via a control filter unit (Pettersson box F2000) to a high-speed A/D card (DAS 16/330) in a laptop (Compaq Armada) equipped with the recording software BatSound Pro 3.31 (Pettersson Elektronik AB, Uppsala, Sweden).
The wing-beat frequency of all bats scaled as predicted and M. capaccinii did not appear to be an outlier, so the result cannot be explained by lower wing-beat frequency and hence power in M. capaccinii.
Once the radio frequency of a third or fourth bat is scanned, it might already have moved too far to be recognized as a foraging group member.
However, the S&P 500′s average increase of 5.3% following an NL triumph was more than twice the average outcome after an AL win and the NL's frequency of a positive return (aka batting average) was a whopping 0.760, or three out of every four at bats!
The teams of observers noted the compass bearing of the signal of each audible radio transmitter every two minutes, scanning through the frequencies of all bats as quickly as possible in a predetermined sequence.
According to the frequency of Vampire Bat bites in cattle, the presence of rabies virus in populations of bats, and ecologic variables (e.g., temperature, precipitation, altitude, and land use), the GIS program defines areas of low, medium, and high-risk of disease.
In Messel's fossils, they can calculate the frequency a bat echo-located on from the shape and size of its ears.
While v represents the velocity of a bat, f is the frequency value.
Ruth Hadden, from my local bat group, tunes a knob on a black box to align it with the frequency of this particular bat's call.
