The rapidly deteriorating precision at the highest temperatures is attributable mostly to those density tubes which contained the least AICI3. That this is so was demonstrated by using Equation 1to calculate V¿ at various temperatures, using Ti and m¡ from Table I and D and d from Equation 5. Appropriate corrections for thermal expansion were made. This procedure reproduced the 11 liquid volumes in Table II at 197°C with a ±0.2% average deviation, the nine volumes from 197-337°C with a ±0.7% average deviation, and the eight volumes over the temperature range 197-345°C with an average deviation of ±2.6%. The maximum expected error arising from the uncertainties in the calibration data and cathetometer readings was about ±0.5% to ±1.0%. At the higher temperature it was evident that the tubes with the least Aids, and most especially tubes IV and V, were the sources of most of the uncertainty. On the other hand, the liquid volume in tube III, whose overall density of A1C13 was very nearly the critical density, could be calculated to within ±1.5% of the observed value at temperatures as high as 355°C.
The performance of a multi-access protocol is strongly dependent upon the traffic model and network loading. It has been shown that random access protocols such as CSMA/CD are very efficient at low loading, while reservation protocols exhibit better throughput-delay performance at medium and high loading ranges. The CSMA/CD-based two channel reservation network (TCRN) combines the advantages of both random access as well as reservation protocols to give a better performance than CSMA/CD for identical bandwidths. Recently attention has been given to protocols which use priority systems.In this paper we describe and compare the TCRN class of networks: TCRN and two priority TCRN-based protocols, first with a preemptive priority (TCRN/PP) and second with a non-preemptive priority (TCRN/NPP), to other popular data networks. In order to examine the behavior of our protocols under time-constrained conditions, we check the percentage of voice packets which are transmitted within a given amount of time after their generation at a transmitting station and the voice capacity, both under different operating conditions. The results show that the channel is efficiently used to minimize the average delay for the data portion and to maintain as many voice stations as possible.
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