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Benign paroxysmal positional vertigo (BPPV) is a disorder arising from a problem in the inner ear. [3] Symptoms are repeated, brief periods of vertigo with movement, characterized by a spinning sensation upon changes in the position of the head. [1] This can occur with turning in bed or changing position. [3]
Benign paroxysmal positional vertigo (BPPV) - This is the most common cause of vertigo in adults, but it is rarer in children. Unlike BPVC, BPPV is provoked by changes in the head position. [4] Otitis media and Vestibular neuritis - Unlike BPVC, these conditions are both associated with ear pain or fullness, and the vertigo is not episodic. [3]
Loss of activity caused by photobleaching can be controlled by reducing the intensity or time-span of light exposure, by increasing the concentration of fluorophores, by reducing the frequency and thus the photon energy of the input light, or by employing more robust fluorophores that are less prone to bleaching (e.g. Cyanine Dyes, Alexa Fluors ...
Etendue can then remain constant or it can increase as light propagates through an optic, but it cannot decrease. This is a direct result of the fact that entropy must be constant or increasing. Conservation of etendue can be derived in different contexts, such as from optical first principles, from Hamiltonian optics or from the second law of ...
Vertiginous epilepsy has also been referred to as epileptic vertigo, vestibular epilepsy, vestibular seizures, and vestibulogenic seizures in different cases, but vertiginous epilepsy is the preferred term.
Therefore, it can be used to study the optoelectronic properties of materials of various sizes (from microns to centimeters) during the fabrication process without complex sample preparation. [24] For example, photoluminescence measurements of solar cell absorbers can predict the maximum voltage the material could produce. [ 25 ]
In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass through the material without appreciable scattering of light. On a macroscopic scale (one in which the dimensions are much larger than the wavelengths of the photons in question), the photons can be said to follow ...
A compact fluorescent lamp can provide light comparable to a 60 watt incandescent while consuming as little as 15 watts of electricity. The lumen is the photometric unit of light output. Although most consumers still think of light in terms of power consumed by the bulb, in the U.S. it has been a trade requirement for several decades that light ...