Time sharing

Decision/action charts can be used to represent tasks that involve decision-making, time-sharing, or complex conditions and contingencies. 

In the off-line mode of use of the drug file the data-base, stored In a time-shared computer. Is Interrogated through a remote device such as a cathode ray terminal The questions that may be asked Include all the affects of a drug, all the drugs that affect a test, or more specifically does a particular drug affect a particular test procedure by a particular mechanism ... 

Burgering M, Boelens R, Kaptein R. Observation of intersubunit NOEs in a dimeric P22 Mnt repressor mutant by a time-shared [15N,13C] double halffilter technique. J Biomol NMR 1993 3 709-714. 

Now, we have an important principle to understand, what I call the principle of time sharing. To understand it, we will need to start by applying it only to DC-DC converters at... 

What happens if Vsw < VD In fact that is the situation in most commercial Flybacks. But note that to do a proper comparison, you have to reflect the diode drop to the primary side. And for that we have to multiply the diode drop by the turns ratio (see the equivalent Buck-Boost models of a Flyback section in my book, Switching Power Supply Design Optimization). So, for example, if the turns ratio is 20 and the diode drop is 0.6V, the effective VD we need to compare with Vsw for our time-sharing analysis is 0.6 x 20 = 12V. And that is usually greater than the (average) drop across the switch. Therefore, we tend to say that in a Flyback, decreasing D (increasing input) will worsen the total conduction loss and decrease the efficiency. But of course that never happens, because as we increase the... 

By the time-sharing principle, we see that in a Buck converter if Vsw is close to VD, the conduction losses do not change with duty cycle or input voltage. But the switching losses progressively increase, and so the efficiency falls off smoothly (almost linearly) with increasing input. See Figure 10-7 for the curve marked Vsw = VD. An example of this is the... 

The distinction between mini - and microcomputers is becoming essentially one of size and price. Minicomputers, which use 16- or 32-bit words, had much larger memories than microcomputers and could be used for the control of several laboratory instruments on a time-sharing basis. However, microcomputers are becoming ever more powerful. Although some still use 8-bit words, 16-bit and 32-and 64-bit word machines are becoming stan-... 

MUX, cassette dosing, and sample pooling (parallel chromatography) approaches time-share MS by reducing dwell windows or reducing the number of data points across a chromatographic peak. These approaches in which the data parcels in milliseconds can monitor multiple channels rapidly... 

MS Time Sharing Method Laboratory and Instrument Activity... 

Digital computers are used in process control systems on a time-shared basis. A single digital computer (or microprocessor) services a number of control... 

In the late 1970s, Hewlett-Packard introduced the HP-3300 series data-acquisition system, which was able to connect to 60 chromatographic instruments through an A/D converter. This was the beginning of what would become a revolution in CDS development within the analytical instrument industry. By the mid-1980s, all of the major analytical instrument manufacturers offered network-based data-acquisition systems Beckman, HP, PE, VG, and Waters. These were multi-user, time-sharing systems that used A/D converters to acquire data from the instruments. Instrument control, both HPLC and GC, was a capability that would soon follow. Several CDS manufacturers offered serial control of the HP 5890 GC while Waters also offered instrument control for their own HPLCs. 

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