Precise timing

Synthetic gemstone materials often have multiple uses. Synthetic mby and colodess sapphire are used for watch bearings, unscratchable watch crystals, and bar-code reader windows. Synthetic quartz oscillators are used for precision time-keeping, citizen s band radio (CB) crystals, and filters. Synthetic mby, emerald, and garnets are used for masers and lasers (qv). 

The technology of instant photography has been extended to include the appHcation of similar chemistry to films wherein processing is delayed for a time after exposure. Whereas the multistep darkroom processes used for noninstant color films require precise time and temperature control, the instant processes require Htde or no timing and operate over a wide range of temperatures. 

Krishnan found that both the eontact area and removal effieiency curves could be fitted by logarithmic equations with approximately the same time eonstants (148 and 164 h for the eontact area and removal efficieney eurves, respectively. Although the precise time constants would be expected to vary with the specifie eontacting materials, Krishnan s results to establish a elear eorrelation between plastie flow and partiele adhesion. 

The reason for this disappointing response is uncertain but may be due to desensitisation of the GABAa receptors, or the actual inhibition of GABA inhibitory neurons through somatic autoreceptors which could disrupt the precise timing of physiological inhibition. Activation of the GABAb receptor with baclofen has no... 

The process of reentry is depicted in Fig. 6-3.4 Under normal circumstances, when a premature impulse is initiated, it cannot be conducted in either direction down either pathway because the tissue is in its absolute refractory period from the previous beat. A premature impulse may be conducted down both pathways if it is only slightly premature and arrives after the tissue is no longer refractory. However, when refractoriness is prolonged down one of the pathways, a precisely timed premature beat may be conducted down one pathway, but cannot be conducted in either direction in the pathway with prolonged refractoriness because the tissue is still in its absolute refractory period (Fig. 6-3, panel la).4 When the third condition for reentry is present, that is, when the velocity of impulse conduction in the other pathway is slowed, the impulse traveling forward down the other pathway still cannot be conducted. However, because the impulse in the other pathway is traveling so slowly, by the time it circles around and travels upward down the other pathway, that pathway is no longer in its absolute refractory period, and now the impulse may travel upward in that pathway. In other words,... 

O Ventricular tachycardia is usually initiated by a precisely timed VPD, occurring during the relative refractory period, which provokes reentry within ventricular tissue. 

Raff That is the real mystery. Specific RNA and protein degradations are turned on at precise times, even though there is no RNA or protein synthesis. 

The model is based on a fixed duration of tasks as shown in constraint (3.7). This constraints states that the time at which the output state from unit j exits, is the time at which the input state entered the unit at the previous time point plus the duration of the task. The binary variable ensures that the constraints holds whenever the unit is used at the precise time, i.e. p — 1. 

Presence of a digital timer for precise time adjustment. 

The precise time to attain equilibrium was not determined but equilibration was monitored both by the drift of total energy and the stability of the system density. The simulation boxes were cubes (for both hexytols) or a truncated octahedron (for MTHP). The VAX 11/750 of the IFLYSIB performed the main calculations. Graphic displays were produced with a personal computer and ALCHEMY software (Tripos Inc., St. Louis). 

GDI systems have become the predominant ignition systems since the 90 s due to the increased reliability of their electronic components and their precise timing ability. Racing GDI systems are even able to fire the plugs 8-12 times at idle on each power stroke but usually only once above 3,000 rpm. This gives better fuel burn and more power. 

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