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A major application of current loops is the industry de facto standard 4–20 mA current loop for process control applications, where they are extensively used to carry signals from process instrumentation to proportional–integral–derivative (PID) controllers, supervisory control and data acquisition (SCADA) systems, and programmable logic ...
NEC and Toshiba used this process for their 4 Mb DRAM memory chips in 1986. [47] Hitachi, IBM, Matsushita and Mitsubishi Electric used this process for their 4 Mb DRAM memory chips in 1987. [37] Toshiba's 4 Mb EPROM memory chip in 1987. [47] Hitachi, Mitsubishi and Toshiba used this process for their 1 Mb SRAM memory chips in 1987. [47]
Specifically, leakage current and threshold voltage do not scale with size, and so the power density increases with scaling. This eventually led to a power density that is too high. This is the "power wall", which caused Intel to cancel Tejas and Jayhawk in 2004. [9] Since around 2005–2007 Dennard scaling appears to have broken down.
Following the patent and release of Harold's Long Scale calculator featuring two knobs on the outside rim in 1914, he designed the Magnum Long Scale calculator in 1927. [6] [7] As the name "Magnum" implies, it was a fairly large device at 4.5 inches in diameter—about 1.5 inches more than Fowler's average non-Magnum-series calculators. [8]
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The Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long.
[4] Because it has no iron core to saturate, it is highly linear even when subjected to large currents, such as those used in electric power transmission, welding, or pulsed power applications. [4] This linearity also enables a high-current Rogowski coil to be calibrated using much smaller reference currents. [2]
Mostek's device took longer to develop but was the world's first single chip calculator, the MK6010, used for the Busicom LE-120A which went on the market in 1971 and was the smallest calculator available for some time. [3] Hewlett-Packard also contracted with Mostek for design and production of chips for their HP-35 and HP-45 calculators. [4]