نتایج جستجو برای: pulsed power
تعداد نتایج: 518938 فیلتر نتایج به سال:
−47− Vertical-cavity surface-emitting lasers (VCSELs) are attractive for various applications because of their low cost, ease of designing two-dimensional arrays, and the low divergence angles of the output beam, provided that the issue of their relatively low output power is addressed. The maximum output power of previously reported VCSELs was just over 2 W for CW operation and just over 20 W ...
We calculate the field emitted by a pulsed point source above a planar interface. It is found that the observed power spectrum can differ significantly from the emitted spectrum. Also, the observed power spectrum depends strongly on the wave speeds in the two media and on the position of the observation point with respect to the interface and the source.
We report the discovery of non-thermal pulsed X-ray/soft γ-ray emission up to ∼ 150 keV from the anomalous X-ray pulsar AXP 1E 1841-045 located near the centre of supernova remnant Kes 73 using RXTE PCA and HEXTE data. The morphology of the double-peaked pulse profile changes rapidly with energy from 2 keV up to ∼ 8 keV, above which the pulse shape remains more or less stable. The pulsed spectr...
We report the first detection of pulsed X-ray emission from the young, energetic radio and gammaray pulsar PSR B1706−44. In a 47 ks observation with the High Resolution Camera on-board the Chandra X-ray Observatory we find a pulsed signal at a frequency consistent with the radio ephemeris, f = 9.7588081± 0.0000027 Hz (at epoch 51585.34104 MJD). The broad, single-peaked pulse profile has a pulse...
Many potential clinical applications of chemical exchange saturation transfer (CEST) have been studied in recent years. However, due to various limitations such as specific absorption rate guidelines and scanner hardware constraints, most of the proposed applications have yet to be translated into routine diagnostic tools. Currently, pulsed CEST which uses multiple short pulses to perform the s...
The need for high voltage solid-state power electronic devices for advanced power distribution and energy conversion has grown rapidly in recent years, especially for pulsed power applications that require high turn-on di/dt. However, current power converters built with silicon (Si) switches are quite bulky and inefficient, making their utilization difficult in practical energy conversion and p...
Photoacoustic (PA) imaging of biological tissues using laser diodes instead of conventional Q switched pulsed systems provides an attractive alternative for biomedical applications. However, the relatively low energy of laser diodes operating in the pulsed regime, results in generation of very weak acoustic waves, and low signal-to-noise ratio (SNR) of the detected signals. This problem can be ...
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