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The HAL HF-24 Marut ("Spirit of the Tempest") was an Indian jet fighter aircraft developed and manufactured by Hindustan Aeronautics Limited (HAL) during the 1960s and early 70s. The Marut was designed by the German aeronautical engineer Kurt Tank , with the Project Engineer being George William Benjamin.
HR: heart rate: hr: hour or hours HRS Hepatorenal syndrome: HRAS: Harvey rat sarcoma viral oncogene homolog HRCT: High-resolution computed tomography: HRT: hormone replacement therapy: h.s. at bedtime (from Latin hora somni) hs: hours of sleep H→S: heel-to-shin test HSC: human chorionic somatomammotropin (same as human placental lactogen) HSCT
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00 (:00) to 23 (:59), with 24 (:00) as an option to indicate the end of the day. This system, as opposed to the 12-hour clock, is the ...
High-frequency direction finding. High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II. High frequency (HF) refers to a radio band that can effectively communicate over long distances; for example, between U-boats and their land ...
Deaths. 35% risk of death in first year [ 10] Heart failure ( HF ), also known as congestive heart failure ( CHF ), is a syndrome caused by an impairment in the heart's ability to fill with and pump blood. Although symptoms vary based on which side of the heart is affected, HF typically presents with shortness of breath, excessive fatigue, and ...
The 24th hour on the right side of the dial is typical for the old Italian time system of 24 hours counted from dusk. Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution). The more familiar 12-hour analog dial has an hour hand that makes two complete ...
Heart rate variability ( HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval. Other terms used include "cycle length variability", "R–R variability" (where R is a point corresponding to the peak of the QRS complex of the ECG wave; and R–R is ...
The Nürburgring 24 Hours is a 24-hour annual touring car and GT endurance racing event that takes place on a combination of the Nordschleife ("North Loop") and the GP-Strecke ("Grand Prix track") circuits of the Nürburgring in Rhineland-Palatinate, Germany. Held since 1970, the over 25.3 km (15.7 mi) lap length allows more than 200 cars and ...