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An intensity-duration-frequency curve (IDF curve) is a mathematical function that relates the intensity of an event (e.g. rainfall) with its duration and frequency of occurrence. [1] Frequency is the inverse of the probability of occurrence. These curves are commonly used in hydrology for flood forecasting and civil engineering for urban ...
Time of concentration is useful in predicting flow rates that would result from hypothetical storms, which are based on statistically derived return periods through IDF curves. [4] [5] For many (often economic) reasons, it is important for engineers and hydrologists to be able to accurately predict the response of a watershed to a given rain event.
An IDF modified H-S Precision Pro Series 2000 HTR rifle Barrett M82A1: Anti-materiel rifle: 12.7×99mm United States: Used mainly by the Combat Engineering Corps and IDF Special Forces McMillan TAC-50 [citation needed] Long range sniper rifle/Anti-materiel rifle: 12.7×99mm United States: Used by IDF Special Forces. Barrett MRAD [citation needed]
IDF—Intermediate Distribution Frame; IDF—Intermediate Data Format; IDL—Interactive Data Language; IDL—Interface Definition Language; IdP—Identity Provider (cybersecurity) IDS—Intrusion Detection System; IE—Internet Explorer; IEC—International Electrotechnical Commission; IEEE—Institute of Electrical and Electronics Engineers
Capability curve of an electrical generator describes the limits of the active and reactive power that the generator can provide. The curve represents a boundary of all operating points in the MW/MVAr plane; it is typically drawn with the real power on the horizontal axis, and, for the synchronous generator , resembles a letter D in shape, thus ...
Synchronous impedance curve (short-circuit characteristic curve), showing armature current as function of field current. The curve is obtained by rotating the generator at the rated RPM with the output terminals shorted and the output current going to 100% of the rated for the device (higher values are typically not tested to avoid overheating ...
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The curve is typically plotted alongside the synchronous impedance curve. [ 1 ] At the low field, the permeable iron in the magnetic circuit of the generator is not saturated , therefore the reluctance almost entirely depends on the fixed contribution of the air gap , so the part of the curve that starts at the point of origin is a linear "air ...