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The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.
The Intel 4004 – a 4-bit CPU (central processing unit) on a single chip – was a member of a family of 4 custom chips designed for Busicom, a Japanese calculator manufacturer. The other members of the family (constituting the MCS-4 family) were: the 4001, a 2k-bit metal-mask programmable ROM with programmable input-output lines; the 4002, a ...
A QT interval is a value that is measured on an electrocardiogram. Measurements begin from the start of the Q wave to the end of the T wave. The value is an indication of the time it takes for a ventricle from the beginning of a contraction to the end of relaxation.
Frederica Perera (born 1941) is an American environmental health scientist and the founder of the Columbia Center for Children's Environmental Health at the Columbia ...
Frederica Darema is a Greek American physicist. She proposed the SPMD programming model in 1984 and Dynamic Data Driven Application Systems (DDDAS) in 2000. She was elected IEEE Fellow in 2004.
Heart rate variability visualized with R-R interval changes Electrocardiogram (ECG) recording of a canine heart that illustrates beat-to-beat variability in R–R interval (top) and heart rate (bottom).
Frederica of Hanover (Friederike Luise; Greek: Φρειδερίκη, romanized: Freideríki Luísa; 18 April 1917 – 6 February 1981) was Queen of Greece from 1 April 1947 until 6 March 1964 as the wife of King Paul and the Queen Mother of Greece from 6 March 1964, when her son Constantine II became King, until 8 December 1974, when the monarchy was officially abolished after a referendum.
Fredericia (Danish pronunciation: [fʁeðəˈʁetɕæ]) [3] is a town located in Fredericia Municipality in the southeastern part of the Jutland peninsula in Denmark. The city is part of the Triangle Region, which includes the neighbouring cities of Kolding and Vejle.