62,736 research outputs found
Mutual impedance effects in scanned antenna arrays technical report no. 2
Mutual impedance effects in electronically-scanned antenna array
Electronic scanning and beam shaping methods technical report no. 1
Electronically scanned antenna array and beam scannin
The measurement of harmonics produced by a pin diode in a microwave switching application Final report
Measurement of harmonics produced by a pin diode in microwave switc
Current drainage to a high voltage probe in a dilute plasma
Electron drainage current from dilute plasma through holes in high voltage dielectric probe
Study of inexact modeling techniques Final report
Scale modeling antenna systems for aircraft and missiles with anechoic chamber evaluation and us
Prediction of the functional properties of ceramic materials from composition using artificial neural networks
We describe the development of artificial neural networks (ANN) for the
prediction of the properties of ceramic materials. The ceramics studied here
include polycrystalline, inorganic, non-metallic materials and are investigated
on the basis of their dielectric and ionic properties. Dielectric materials are
of interest in telecommunication applications where they are used in tuning and
filtering equipment. Ionic and mixed conductors are the subjects of a concerted
effort in the search for new materials that can be incorporated into efficient,
clean electrochemical devices of interest in energy production and greenhouse
gas reduction applications. Multi-layer perceptron ANNs are trained using the
back-propagation algorithm and utilise data obtained from the literature to
learn composition-property relationships between the inputs and outputs of the
system. The trained networks use compositional information to predict the
relative permittivity and oxygen diffusion properties of ceramic materials. The
results show that ANNs are able to produce accurate predictions of the
properties of these ceramic materials which can be used to develop materials
suitable for use in telecommunication and energy production applications
Hyperopic Cops and Robbers
We introduce a new variant of the game of Cops and Robbers played on graphs,
where the robber is invisible unless outside the neighbor set of a cop. The
hyperopic cop number is the corresponding analogue of the cop number, and we
investigate bounds and other properties of this parameter. We characterize the
cop-win graphs for this variant, along with graphs with the largest possible
hyperopic cop number. We analyze the cases of graphs with diameter 2 or at
least 3, focusing on when the hyperopic cop number is at most one greater than
the cop number. We show that for planar graphs, as with the usual cop number,
the hyperopic cop number is at most 3. The hyperopic cop number is considered
for countable graphs, and it is shown that for connected chains of graphs, the
hyperopic cop density can be any real number in $[0,1/2].
Variability in sonic-boom signatures measured along an 8000-foot linear array
Variability in sonic boom signatures measured along 8000 foot linear microphone arra
NERVA irradiation program, GTR test 21. Volume 4 - Effect of radiation on structural materials tested at cryogenic and elevated temperatures
Effect of radiation on structural materials for NERVA engine tested at cryogenic and elevated temperatures - Vol.
Microburst phenomena. I - Auroral zone X-rays
Balloon observations of auroral zone bremsstrahlung X-ray microburst
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