The proposed source, radiating the sound from a ring-like area, has a useable frequency range of 150 Hz–10 kHz, with 106 dB sound power and good uniformity of pressure with angle.
The diurnal and seasonal changes of the variability (VR) of Maximum Useable Frequency (MUF) are compared with those of peak electron density (NmF2) at Ibadan (7.4°N, 3.9°E, 6°S dip) in the African sector.
While in the present experiment the broadening of the carrier was not significant, it is expected to be more pronounced in in-vivo measurements and to limit the minimum useable PT frequency.
The distribution of minor allele frequencies for the useable polymorphic SNPs was uniform between classes [0, 0.1[,[0.2[ 0.3[,[0.4[ 0.5],[0.3, 0.4[,[0.4, 0.5] (data not shown),.
With the further advancement of information technology, and in order to cope up with the needs, the useable range of EM wave's frequencies will shift to much higher bandwidths and thus will be more problematic as much higher levels of this pollutant will spread in the atmosphere.
Generally, the lower the operating frequency, the greater the maximum useable height, so that for example at 2 MHz, meteor trails are detected to heights near 120 km (e.g., Steel and Elford 1991; Tsutsumi et al. 1999).
This also means that the maximum useable height is not fixed for a particular frequency radar or location, and the actual maximum useable height may not be readily identifiable for a particular location unless some care is taken (see e.g., Namboothiri et al. 1993).
Furthermore, information on food intake was based on a semi-quantitatively food frequency questionnaire [ 49, 53], which was, however, evaluated and found useable [ 52].
The sensors are coin-shaped piezoelectric elements with linear ±3dB frequency response from 75 to 2000 Hz, a resonance at 2.7 kHz, a useable range that extends beyond 4 kHz, and a built-in passive ambient noise rejection capability.
The sensors are coin-shaped piezoelectric elements with linear ±3 dB frequency responses from 75 to 2000 Hz, a resonance at 2.7 kHz and an useable range that extends beyond 4 kHz [ 9].
A miniature optical engine with LED light source has the advantages of good power consumption, useable projected image, reasonable brightness and uniformity, compactness in volumetric size and decent performance specifically for high spatial frequencies.
