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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
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Zinc sulfate is an inorganic compound with the formula ZnSO 4.It forms hydrates ZnSO 4 ·nH 2 O, where n can range from 0 to 7. All are colorless solids. The most common form includes water of crystallization as the heptahydrate, [4] with the formula Zn SO 4 ·7H 2 O.
The zinc-chloride cell, frequently referred to as a heavy-duty, extra-heavy-duty, super-heavy-duty, or super-extra-heavy-duty battery, is an improvement on the original zinc–carbon cell, using purer chemicals and giving a longer service life and steadier voltage output as it is used and offering about twice the service life of general-purpose ...
Zinc is extracted from the purified zinc sulfate solution by electrowinning, which is a specialized form of electrolysis. The process works by passing an electric current through the solution in a series of cells. This causes the zinc to deposit on the cathodes (aluminium sheets) and oxygen to form at the anodes. Sulfuric acid is also formed in ...
Zinc phosphide (Zn 3 P 2) is an inorganic chemical compound.It is a grey solid, although commercial samples are often dark or even black. It is used as a rodenticide. [5] Zn 3 P 2 is a II-V semiconductor with a direct band gap of 1.5 eV [6] and may have applications in photovoltaic cells. [7]
The genus Hypargos was introduced in 1862 by the German naturalist Ludwig Reichenbach to accommodate the pink-throated twinspot. [1] [2] The name combines the Ancient Greek hypo meaning "beneath" with Argos from Argus Panoptes, the many-eyed giant in Greek mythology. [3]
[now B. hectae transcaucasica (Wnukowsky, 1929)](68f) is a rather large form, which is more yellowish brown above and very light yellow on the hindwing beneath, the cinnamon-brown being much reduced; from the shores of the Black Sea, especially Armenia. — alaica Stgr.[now B. hecate alaica (Staudinger, 1886)] (68g), from the Pamir and the Ala ...