This study deals with the mechanic impulse transmitted to a solid target by soft x rays. We have measured the impulse transmitted to thin aluminum layers by x-ray radiation around 1.2 keV produced by a laser-irradiated copper target. The results are compared to radiative hydrocode simulations with the code XRAD.
A stringed instrument, such as a violin, is provided wherein the bridge of the instrument rests on a resonator bar, and the resonator bar has a plurality of individually-tuned resonators. A pickup, either electronic or acoustic, is coupled to the resonator bar. The output can be purely acoustic or, if an electronic transducer is used, it can be coupled to an amplifier and the output made almost entirely electronic. A mixed electronic and acoustic output can also be obtained. In accordance with one embodiment of the invention, a variable damping feature is provided.
A novel slot antenna designed on the road surface for machine-to-machine (M2M) RFID communication is presented. A corrugated ground plane with perturbed surface impedance is used underneath the antenna's radiator to adjust the antenna's radiation pattern, which otherwise will be highly affected by the properties of the road surface. The proposed antenna configuration is verified by full-wave simulations with various road surface conditions. The results show that the antenna has a stable performance with different road conditions. It possesses more than 12 dB return loss, more than 1.4 dBi gain, vertical polarization, and desirable radiation pattern from 880 MHz to 960 MHz.