This paper describes a small scale VHF Spaced Antenna Boundary Layer Radar which has been developed using only three antennas. This radar was deployed at Buckland Park, Adelaide Australia for five days in October 2003. Comparisons with a 27 antenna VHF Boundary Layer Radar installed at the same site show excellent agreement with comparable coverage.

A novel technique for a self-equalized distributed amplifier is presented by showing the analogy between transversal filters and distributed amplifier topologies. The appropriate delay and gain coefficients of amplifier circuit are obtained by a Fourier expansion of the raised cosine spectrum in the frequency range of 0-40GHz.

In this paper a new method for the design of a linear phase distributed amplifier in 180nm CMOS technology is presented. The method is based on analogy between transversal filters and distributed amplifiers topologies. In the proposed method the linearity of the phase at frequency range of 0-50 GHz is obtained by using proper weighting factors for each gain stage in cascaded amplifier topology....

Satellite-based VHF lightning detection is characterized at GPS orbit by using a VHF receiver system recently launched on the GPS SVN 54 satellite. Collected lightning triggers consist of Narrow Bipolar Events (80%) and strong negative return strokes (20%). The results are used to evaluate the performance of a future GPS-satellite-based VHF global lightning monitor. INTRODUCTION Over the last f...

the graphical technique for nonlinear circuits was described that enable us to optimize circuits to obtain maximum output power, maximum efficiency or minimum intermodulation. according to this method a high power amplifier in the ka band was designed. using a nonlinear model of the transistor, optimum slope for load-line was determined so that maximum power at the output was obtainable, then ...

Currently, a number of wireless access systems have been available to users. Especially, several new systems can be used on not only 800-6000MHz band that is suitable for cellular communications and broadband wireless access systems but also the lower frequency band such as VHF and UHF bands. This means that most frequency bands adequate for mobile communication systems are fully occupied after...

Photoswitch triads comprising two dihydroazulene (DHA) units in conjugation with a central trans-azobenzene (AZB) unit were prepared stepwise protocols starting from meta- and para-disubstituted azobenzenes. The para-connected triad had significantly altered optical properties lacked the photoactivity of separate photochromes. In contrast, for meta-connected triad, all three photochromes could ...

BACKGROUND Since the year 2000, Uganda has experienced repeated outbreaks of viral hemorrhagic fevers (VHF). Ebola VHF outbreak occurred in the districts of Gulu in 2000, Bundibugyo, 2007, Luwero, 2011, Kibaale in July 2012, Luwero in November 2012. Marburg VHF was earlier reported in Ibanda in 2007. More recently in 2012, two outbreaks of Marburg VHF have occurred in Ibanda and Kabale district...

In 1988, CDC published guidelines for managing patients with suspected viral hemorrhagic fever (VHF) (1). Pending a comprehensive review of the 1988 guidelines, this notice provides interim recommendations that update the 1988 guidelines for healthcare settings in the United States. This update applies to four viruses that cause syndromes of VHF: Lassa, Marburg, Ebola, and Congo-Crimean hemorrh...