What Parrots Tell Us About the Evolution of Birds
GrrlScientist writes "One of the most contentious issues among scientists who study the evolution of birds is identifying precisely when the modern birds (Neornithes) first appeared. This is due to conflicts between the fossil record and molecular dating methodologies. But there is another way to address this discrepancy. Because the evolution of parrots and cockatoos reflects the evolution of the birds (Aves) themselves, studying the psittaciformes offers compelling insights into this mystery. Further, because psittaciformes generally are not migratory and because they tend to occupy discrete ranges, their ancient patterns of diversification are easier to discern than for many other taxonomic orders of birds that have dispersed widely."
The AD9859 is a direct digital synthesizer (DDS) featuring a
10-bit DAC operating at up to 400 MSPS. The AD9859 uses
advanced DDS technology, coupled with an internal high speed,
high performance DAC to form a digitally programmable,
complete high frequency synthesizer capable of generating a
frequency-agile analog output sinusoidal waveform at up to
200 MHz. The AD9859 is designed to provide fast frequency
hopping and fine tuning resolution (32-bit frequency tuning
word). The frequency tuning and control words are loaded into
the AD9859 via a serial I/O port.
The AD9859 is specified to operate over the extended industrial
temperature range of â"40ÂC to +105ÂC
Its not dead yet.
Of course it's not dead. It's pining for the fjords.
[b.belong('us') for b in bases if b.owner() == 'you']
When my butt sneezes my nose smells poop?
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