FiFo principle

Some injection moulding machines are designed according to the First-In, First-Out (FIFO) principle. The material first plasticised is also the first material to be injected so that the thermal state of the entire shot volume is identical. 

A system should be in place to ensure that pharmaceutical products due to expire first are sold and/or distributed first (FEFO). Where no expiry dates exist for the products, the FIFO principle should be applied. Exceptions may be permitted as appropriate, provided that adequate controls are in place to prevent the distribution of expired products. 

With this method, the extruder also works continuously, but the melt is stored in a tubular piston accumulator (Figure 1.139) from which the plastic is intermittently extruded to produce the tubular preform. Figure 1.140 illustrates an extrusion blow molding machine equipped with an accumulator head as it is used, for example, in the manufacture of plastic fuel tanks, barrels, liners, and other similar large structures. The removal of the finished part is done with grippers and a transfer mechanism. The accumulator heads work best with the first in, first out (FiFo) principle. This is necessary in order to accommodate for the limited thermal stability of the plastic. 

Herbal materials, including raw herbal materials, should be kept in a dry area protected from moisture and processed following the principle of first in, first out (FIFO). 

A different approach is event , time stamp", or time tag" recording. The technique writes the time of the individual detection events into memory. The general principle is shown in Fig. 2.11. A fast counter counts the clock periods from the moment when a pulse arrives at the trigger input. When a photon is detected the state of the counter is read and written into the next location of the memory. The memory is usually configured as FIFO (first in first out), i.e. the bytes at the output are read in the same order as they were written into the input. 

The eount rate of the event recording principle depends on the memory read and write rates. The peak count rate is limited by the write rate, the average count rate limited by the rate the FIFO can be read at the output. Currently, the count rates for deviees based on event recording techniques are substantially lower than for the multisealers employing direct accumulation techniques. 

FIFO First-In-First-Out. Principle used in data buffers. Successive data... 

First-in-first-out (FIFO), 1521, 2157, 2167 First Man program, 1112 First price auctions, 274 First-principle models of human behavior, 2413-2414. See also Man-Machine Integrated Design and Analysis System (MIDAS)... 

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