fue to the importance of selecting imaging parameters in magnetic resonance brain angiography, this study was carried out to choose optimum theoretical and experimental parameters for improving image controast and resolution and achieve shorter imaging time for practical reasons.a 1.5t super conductive magnet mri with gradient power of 13 nt/m and larmour frequency of 63 mhz with imaging coli o...

With the increased use of sensitive electronic circuitry, customers become more concerned about the electric power quality (PQ). In the new open-access and competitive power market, electricity consumers are in a unique position to demand a higher quality of service. The utilities or other power providers have to ensure a high quality of their service to remain competitive and retain/attract th...

[1] The primary goal of the Ocean Seismic Network Pilot Experiment (OSNPE) was to learn how to make high quality broadband seismic measurements on the ocean bottom in preparation for a permanent ocean seismic network. The experiment also had implications for the development of a capability for temporary (e.g., 1 year duration) seismic experiments on the ocean floor. Equipment for installing, op...

Actual challenge for RF ICs designers lays in the realization of high-quality integrated inductors. This paper introduces the concept of boot-strapped inductor and presents its application in a fully-integrated LNA with resonant LC preselect filter. n e LNA achieves a power gain of 36 dB, a band-pass of 140 MHz and a noise figure of 2.0 dB at a working frequency of 1.8 GHz with a 3 V power supply.

The authors address some fundamental issues in track-and-hold (T&H) design. A number of explicit expressions characterising the main limitations of this class of circuits are given. A fully differential open-loop T&H is presented satisfying the stringent specifications imposed by present telecom applications. It exhibits high-resolution (12 bit) and high-speed V;.k = 160MHz) as measured on samp...

Modern power grids must be highly reliable and provide power with a high quality. Power quality issues like voltage sags or current harmonics must be minimized, in order to achieve high levels of reliability in the system. One possible way to overcome such problems is through the utilization of active power filters like a Unified Power Quality Conditioner (UPQC). On the other hand, Superconduct...