Negative refraction occurs at interfaces between materials at which one has an ordinary positive phase velocity ( i . e . a positive refractive index ), and the other has the more exotic negative phase velocity ( a negative refractive index ).
32.
When a nuclear weapon or a large amount of a conventional explosive is detonated in sufficiently humid air, the " negative phase " of the shock wave causes a rarefaction ( reduction in density ) of the air surrounding the explosion, but not contained within it.
33.
The research shows that when the IOD is in its negative phase, with cool Indian Ocean water west of Australia and warm Timor Sea water to the north, winds are generated that pick up moisture from the ocean and then sweep down towards southern Australia to deliver higher rainfall.
34.
The index shows a 50 70 year periodicity but is a strong mode of variability only after 1800, a persistent negative phase occurring during medieval times ( 993 1300 ) which is consistent with La Ni�a conditions reconstructed in the tropical Pacific and multi-century droughts in the South-West United States.
35.
It uses the principle that the positive phase angle of an inductive impedance can be compensated by the negative phase angle of a capacitive impedance when put in the opposite arm and the circuit is at resonance; i . e ., no potential difference across the detector and hence no current flowing through it.
36.
At frequencies below resonance, the crystal is capacitive and the " gain " of the negative feedback branch has a negative phase shift . At frequencies above resonance, the crystal is inductive and the " gain " of the negative feedback branch has a positive phase shift . The phase shift goes through zero at the resonant frequency.
37.
After the passage of a cold front, winds tend to switch to the northwest, and a frequent pattern is for a long-lasting low-pressure area to form over the Canadian Maritimes, which may pull cold northwestern air across the Great Lakes for a week or more, commonly identified with the negative phase of the North Atlantic Oscillation ( NAO ).
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