Thesis (Ph. D.)--Worcester Polytechnic Institute. / Keywords: jitter; phase noise; 1/f noise; oscillator; random number generator. Includes bibliographical references (p. 212-225).

Düsseldorf, Universiẗat, Diss., 2002.

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The work described in this thesis is an investigation into the reactivity and possible synthetic applications of oxiranylcarbinyl radicals. These radicals rapidly rearrange via β-cleavage, which can proceed by breakage of either the C-O or the C-C bond. Cleavage of the latter only occurs when the molecule has a vinyl or phenyl stabilising group attached to the epoxide ring.

A method of performance improvement of token ring networks is presented, based on the use of stations with two latency states. Station latency is defined as the time delay introduced in passing data through a station. Most token ring protocol standards (e.g. IEEE 802.5 or ANSI X3T9.5) require incoming data to be decoded and encoded in the station before transmission onto the ring. These encoding and decoding operations add significantly to the station latency. The bypassing of the encoding and decoding steps is proposed, which improves the mean message waiting time. A detailed evaluation and comparison of the networks is based on both analytical and simulation results. The performance of identical stations and symmetric traffic is obtained analytically. A discrete event simulation model for a token ring network is written in GPSS for general traffic. Results show a significant reduction in mean waiting time for the dual latency ring, with performance approaching or exceeding that of gated and exhaustive service, for certain ranges of network utilization. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

The aim of this study was to examine the influence of photoperiod on the hormonal induction of courtship and nest-building behaviour in the male ring dove (Streptopelia risoria). In the first experiment 24 intact males were divided into two groups and held on long (16L:8D) or short (8L:16D) photoregimes for five weeks. They were then paired with intact females and their behaviour recorded. Long day males exhibited significantly higher levels of bowing and nest-soliciting. In the second experiment males were again held on long or short photoperiods. Half of each group received daily injections of testosterone propionate. Testosterone treatment eliminated differences in courtship between the two groups, but nest-building remained significantly higher in hormone-treated long day birds. The experiment was then repeated using TP-treated castrates. In this case courtship did not vary between long and short groups, although nest-building was still greater under the long photoregime. These results indicate that photoperiod alters male courtship by stimulating endogenous androgen production. The influence on nest-building, however, appears to be least partially dependent upon some other mechanism. / Science, Faculty of / Zoology, Department of / Graduate

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COMPLETION OF CITY ROAD RING IN BRNO. DESIGN OF INTERACTIVE SCIENTIFICLLY ORIENTED MUSEUM.

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