نتایج جستجو برای: vhf amplifier

تعداد نتایج: 25026  

Journal: :Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2016
Lori D Racsa Colleen S Kraft Gene G Olinger Lisa E Hensley

There are 4 families of viruses that cause viral hemorrhagic fever (VHF), including Filoviridae. Ebola virus is one virus within the family Filoviridae and the cause of the current outbreak of VHF in West Africa. VHF-endemic areas are found throughout the world, yet traditional diagnosis of VHF has been performed in large reference laboratories centered in Europe and the United States. The larg...

2011
Mohammad Madani Ibrahim Even Fjære Erik-Jan Lock Danielle Naville Heidi Amlund Emmanuelle Meugnier Brigitte Le Magueresse Battistoni Livar Frøyland Lise Madsen Niels Jessen Sten Lund Hubert Vidal Jérôme Ruzzin

BACKGROUND Dietary interventions are critical in the prevention of metabolic diseases. Yet, the effects of fatty fish consumption on type 2 diabetes remain unclear. The aim of this study was to investigate whether a diet containing farmed salmon prevents or contributes to insulin resistance in mice. METHODOLOGY/PRINCIPAL FINDINGS Adult male C57BL/6J mice were fed control diet (C), a very high...

Journal: :Annales de l'Institut Pasteur. Virology 1988
S Salah E Fox E A Abbatte N T Constantine P Asselin A K Soliman

Viral haemorrhagic fevers (VHF) comprise a group of at least 13 diseases caused by viral infections which may produce severe haemorrhagic complications. VHF are distributed throughout much of the tropics and subtropics. The aetiological agents belong to various families of viruses and can be classified epidemiologically into 4 groups according to their modes Of transmission [5]. VHF are geograp...

2006
Lars M. H. Ulander

Airborne synthetic aperture radar (SAR) operating in the VHF band and used in conjunction with change detection has shown promising results for wide-area surveillance of ground targets. By using VHF-band frequencies, both targets in the open as well as concealed by foliage may be detected in a robust manner. VHF-band SAR is able to detect hidden targets because both foliage attenuation and clut...

1998
R. M. Worthington R. D. Palmer S. Fukao

Using the MU radar at Shigaraki, Japan (34.85°N, 136.10°E), we measure the power distribution pattern of VHF radar echoes from the mid-troposphere. The large number of radar beam-pointing directions (320) allows the mapping of echo power from 0° to 40° from zenith, and also the dependence on azimuth, which has not been achieved before at VHF wavelengths. The results show how vertical shear of t...

2014
Rosalind Parkes-Ratanshi Ali Elbireer Betty Mbambu Faridah Mayanja Alex Coutinho Concepta Merry

INTRODUCTION There have been 3 outbreaks of viral hemorrhagic fever (VHF) in Uganda in the last 2 years. VHF often starts with non-specific symptoms prior to the onset of haemorrhagic signs. HIV clinics in VHF outbreak countries such as Uganda see large numbers of patients with HIV 1/2 infection presenting with non-specific symptoms every day. Whilst there are good screening tools for general h...

2011
S. Lin A. E. Fathy Min H. Kao

A 50 to 550MHz wideband gallium nitride (GaN) HEMT power amplifier with over 43 dBm output power and 63% drain efficiency has been successfully developed. The demonstrated wideband power amplifier utilizes two GaN HEMTs and operates in a push-pull voltage mode Class D (VMCD). The design is based on a large signal simulation to optimize the power amplifier’s output power and efficiency. To assur...

2014
Anthony Larcher Kong-Aik Lee Pablo Luis Sordo Martinez Trung Hieu Nguyen Bin Ma Haizhou Li

Text-dependent speaker verification over degraded radio channel is a challenging task. To better understand the research problem, the Institute for Infocomm Research (I2R) of Singapore has collected a corpus of voice recordings transmitted over marine VHF. Built as an extension of the RSR2015 database, the VHF-RSR2015 consists of recordings from 300 speakers of Part I of the RSR2015 database tr...

2011
Young Kim

Abstract This paper proposes the use of an inverse class-E amplifier with a tunable parallel resonator at the output port in order to obtain a high power-added efficiency (PAE) and output power in a wide frequency range. The tunable resonator circuit has a constant Q factor in the operating frequency range, and since the circuit has a varactor diode, the inductor and capacitor values of the res...

Journal: :international journal of smart electrical engineering 0
hamid niyazi department of electrical engineering, yazd branch, islamic azad university, fakhralsadat rastegari department of electrical engineering, yazd branch, islamic azad university majid pourahmadi department of electrical engineering, yazd branch, islamic azad university

a novel low noise trans-impedance amplifier is proposed using low cost 0.18 µm cmos technology. a resistive-capacitive feedback is used to extend the bandwidth of the amplifier. as the structure is inductor less, it is suitable for low cost integrated optical interconnects. in this paper improved particle swarm optimization have applied to determine optimal trans-resistance and noise of propose...

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