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The ability to distribute signals to all parts of a circuit with precisely controlled and known delays is essential in large, high-speed digital systems. We present a technique by w h i c h a signal driver can adjust the arrival time of the signal at the end of the wire using a pair of matched variable delay lines. We s h o w how this idea can be(More)
Results from the aeroshell-mounted neutral mass spectrometer on Viking I indicate that the upper atmosphere of Mars is composed mainly of CO(2) with trace quantities of N(2), Ar, O, O(2), and CO. The mixing ratios by volume relative to CO(2) for N(2), Ar, and O(2) are about 0.06, 0.015, and 0.003, respectively, at an altitude near 135 kilometers. Molecular(More)
Microscopic physics is entirely reversible, yet almost all computation is done using irreversible processes. Adding two numbers together, for example, destroys information, unless one of the numbers is retained. Over the past few years, some advantages of taking reversible computation seriously have emerged -- first in the context of saving energy, through(More)
SiGe power heterojunction bipolar transistors were fabricated using the Northrop Grumman 6'' bipolar line, which features a polysilicon emitter and SiGe epitaxial base. The power cell utilizes a fishbone structure, with an active area of 500 /spl mu/m/sup 2/ and 1100 /spl mu/m emitter perimeter. Discrete cells were packaged for CW power testing in common(More)
The introduction of new in situ sensing creates the possibility of directly controlling critical process variables in plasma enhanced chemical vapor deposition systems PECVD. The complexity of this process makes it necessary to develop empirical models of the system dynamics. This paper describes the experimental and numerical procedures for identifying(More)
The introduction of new in situ sensing creates the possibility of directly controlling critical process variables in plasma enhanced chemical vapor deposition systems (PECVD). The complexity of this process makes it necessary to develop empirical models of the system dynamics. This paper describes the experimental and numerical procedures for identifying(More)
Among the major objectives of NASA's program of space exploration is a better understanding of the origin and evolution of the solar system. Crucial to this objective is the study of comets, which are thought to be the most primitive, pristine bodies remaining in the solar system. The importance of the study of comets has led NASA to plan a mission to(More)
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