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Dynamic characterization of elastomers using impact testing

Dynamic characterization of elastomers, i.e. laboratory testing and fitting of constitutive models, is quite complicated. The demands on the laboratory equipment and the skill of the personal handling the test equipment are high. Stationary harmonic testing is an established method for evaluating dynamic properties of elastomers. However, it is demanding experimentally when it comes to high freque

Privacy, Surveillance and Digital Trust in the American Case

While generally kept out of sight, government surveillance ostensibly to ensure the security of the state from threats (both foreign and domestic) is a hallmark of the American national security state. What types of surveillance are legally allowable is constantly contested as new technologies emerge that must be tested against American constitutional principles and international law. In the wake

Dolph-Chebyshev approach to the synthesis of beam patterns for uniform circular arrays

Uniform circular arrays (UCAs) are naturally suited to provide 360 degrees of coverage in the azimuthal plane. In this paper, we describe a new approach for synthesizing array patterns with guaranteed maximum sidelobe levels for any look direction. The advantage of this approach is that it is computationally efficient which makes it eminently suitable for real-time beamforming and beamsteering app