James B. Michael

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The compelling need for standoff detection of hazardous gases and vapor indicators of explosives has motivated the development of a remotely pumped, high-gain air laser that produces lasing in the backward direction and can sample the air as the beam returns. We demonstrate that high gain can be achieved in the near-infrared region by pumping with a focused(More)
We calculate bounds on per-lane Automated Highway System (AHS) capacity as a function of vehicle capabilities and control system information structure. We assume that the AHS lane is dedicated for use by fully automated vehicles. Capacity is constrained by the minimum inter-vehicle separation necessary for safe operation. A methodology for deriving the safe(More)
Time-accurate velocity measurements in unseeded air are made by tagging nitrogen with a femtosecond-duration laser pulse and monitoring the displacement of the molecules with a time-delayed, fast-gated camera. Centimeter-long lines are written through the focal region of a ∼1 mJ, 810 nm laser and are produced by nonlinear excitation and dissociation of(More)
ion correctly represent the knowledge embodied in the analyses or experimental data being accumulated at lower levels. Several of the research problems identi ed in section 4 are concerned with ways and means of maintaining correctness in the process of abstraction. We classify the Benefit Layer System Performance & User Acceptance Layer Kinematic Layer(More)
The assumptions underlying security policy models, such as the Bell-LaPadula model, are usually not explicitly stated. This has led to several common misconceptions about this model and its scope. A comparison of manual and automated systems is used to demonstrate the derivation of the Bell-LaPadula ?property (pronounced star-property) for automated systems(More)
High-repetition-rate, burst-mode lasers can achieve higher energies per pulse compared with continuously pulsed systems, but the relatively few number of laser pulses in each burst has limited the temporal dynamic range of measurements in unsteady flames. A fivefold increase in the range of timescales that can be resolved by burst-mode laser-based imaging(More)
Putting the customer requirements in the center and designing new systems around them is considered the right way to design information systems. In this article we claim that requirements change so fast in the information age that customer needs are unknown and impossible to correctly predict for both the customer and the system designer. Basing the design(More)
The study of pulsed laser- and microwave-induced plasma interactions with atmospheric and higher pressure combusting gases requires rapid diagnostic methods that are capable of determining the mechanisms by which these interactions are taking place. New rapid diagnostics are presented here extending the capabilities of Rayleigh and Thomson scattering and(More)
Planar laser-induced incandescence (LII) imaging is reported at repetition rates up to 100 kHz using a burst-mode laser system to enable studies of soot formation dynamics in highly turbulent flames. To quantify the accuracy and uncertainty of relative soot volume fraction measurements, the temporal evolution of the LII field in laminar and turbulent flames(More)
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