Electrostatically-Driven Resonator on Soi with Improved Temperature Stability

This paper deals with a single-crystal-silicon (SCS) MEMS resonator with improved temperature stability. While simulations have shown that the temperature coefficient of resonant frequency can be down to 1 ppm/degrees C, preliminary measurements on non-optimised structures gave evidence of a temperature coefficient of 29 ppm/degrees C. Design, optimisation, experimental results with post process simulation and prospective work are presented.Comment: Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions

Lighting Medea Machine -- Project Summary and Evaluation

The conceptualization and realization of the lighting design for the College of St. Benedict/St. John\u27s University Theater Department\u27s Production of Medea Machine in the Fall of 1991 comprised the bulk of this creative project. Directed at a reading audience of beginning theater students, this written summery includes: a description of the various elements of lighting design, a description of the play itself, a detailing of various artistic influences such as postmodernism and Epic Theater, a description of the elements of the actual design, and an evaluation of the design\u27s effectiveness. Also included are reproductions of the design\u27s light plot, and abridged instrument schedule, production photographs, and a production program

Le Castellan (Istres, Bouches-du-Rhône) : resultats de prospections géophysique

YesTwo seasons of geophysical prospection (magnetic, resistance and ground-penetrating radar) were conducted at the Iron Age oppidum of Le Castellan, Istres, Bouches-du-Rhône, in order to determine the utility of these techniques for sites in this region. The survey revealed numerous strong anomalies, of which many ran parallel or perpendicular to one another. These are the sorts of responses one might expect from the remains of buried stone wall foundations; this interpretation is supported by the presence, on the west side of the site, of exposed walls on the same alignment as certain of the geophysical anomalies. Overall, the evidence suggests a network of buried buildings and road-ways across the oppidum. One particularly substantial building was identified towards the centre of the site, through the presence of a strong resistance anomaly of distinctly rectilinear form. It appears to represent the remains of a buried stone building with three rooms. In conclusion, the results provide strong encouragement for the further application of geophysical survey in this regio

Ectopic cyclin E expression induces premature entry into S phase and disrupts pattern formation in the Drosophila eye imaginal disc

During animal development, cell proliferation is controlled in many cases by regulation of the G1 to S phase transition. Studies of mammalian tissue culture cells have shown that the G1-specific cyclin, cyclin E, can be rate limiting for progression from G1 to S phase. During Drosophila development, down-regulation of cyclin E is required for G1 arrest in terminally differentiating embryonic epidermal cells. Whether cyclin E expression limits progression into S phase in proliferating, as opposed to differentiating, cells during development has not been investigated. Here we show that Drosophila cyclin E (DmcycE) protein is absent in G1 phase cells but appears at the onset of S phase in proliferating cells of the larval optic lobe and eye imaginal disc. We have examined cells in the eye imaginal epithelium, where a clearly defined developmentally regulated G1 to S phase transition occurs. Ectopic expression of DmcycE induces premature entry of most of these G1 cells into S phase. Thus in these cells, control of DmcycE expression is required for regulated entry into S phase. Significantly, a band of eye imaginal disc cells in G1 phase was not induced to enter S phase by ectopic expression of DmcycE. This provides evidence for additional regulatory mechanisms that operate during G1 phase to limit cell proliferation during development. These results demonstrate that the role of cyclin E in regulating progression into S phase in mammalian tissue culture cells applies to some, but not all, cells during Drosophila development. Ectopic expression of DmcycE in the eye imaginal disc disrupts normal pattern formation, highlighting the importance of coordinating cell proliferation with developmental processes for correct patterning in the developing eye. These studies establish DmcycE as a target of regulatory mechanisms that coordinate cell proliferation with other developmental events