نتایج جستجو برای: vhf circuit

تعداد نتایج: 118032  

Journal: :Iet Intelligent Transport Systems 2023

Vessel Traffic Service (VTS) significantly improves the navigation efficiency of ports. This paper proposes a model called Joint Extraction Triples from VHF Speech (JER-VHF) to ensure VTS. Numerous texts are extracted Very High Frequency (VHF) speech communication contents and these organized into dataset named VHFDT. The proposed model's transforming task transforms voice this triple represent...

Journal: :Physical review 2023

Lightning dart leaders and recoil are current pulses that propagate along previously established lightning channels reionizing the channel. They poorly understood since it is not known how a ionized channel can undergo dielectric breakdown multiple times. In this work we investigate five on two different using observations of LOFAR radio telescope in vhf (where observe 30--80 MHz) our TRI-D int...

Journal: :Journal Of Geophysical Research: Atmospheres 2021

Recently, a new lightning phenomena, termed needles, has been observed in both VHF and optical along positive leaders. They appear as small (<100 m) leader branches that undergo dielectric breakdown at regular intervals (called twinkles). Providing coherent consistent explanation for this phenomenon is challenging each twinkle form of negative propagates away from the leader. In study, we provi...

2004
R. Sekar D. Chakrabarty R. Narayanan S. Sripathi A. K. Patra S. V. Subbarao

The VHF radars have been extensively used to investigate the structures and dynamics of equatorial Spread F (ESF) irregularities. However, unambiguous identification of the nature of the structures in terms of plasma depletion or enhancement requires another technique, as the return echo measured by VHF radar is proportional to the square of the electron density fluctuations. In order to addres...

2004
J. Meier U. Kroll J. Spitznagel U. Graf A. Shah

During the last two decades, the Institute of Microtechnology (IMT) has contributed in two important fields to future thin-film silicon solar cell processing and design: (1) In 1987, IMT introduced the so-called ‘‘very high frequency glow discharge (VHF-GD)’’ technique, a method that leads to a considerable enhancement in the deposition rate of amorphous and microcrystalline silicon layers. As ...

Journal: :Applied animal behaviour science 2000
Bergeron Bolduc Ramonet Meunier-Salaün Robert

Twenty-one multiparous sows were used in a Latin square design, from days 7 to 90 of gestation, to test the effect of fibre and food levels on feeding motivation and feeding-related stereotypies. Treatments were: VHF (very high-fibre, 29% ADF, 50% NDF, 4.5kg/day); HF (high-fibre, 23% ADF, 43% NDF, 3.5kg/day); C (control, 8% ADF, 20% NDF, 2.5kg/day); and control fed ad libitum (CAL). All diets e...

2015
W David Walter Dave P Onorato Justin W Fischer

BACKGROUND Global positioning system (GPS) technology for monitoring home range and movements of wildlife has resulted in prohibitively large sample sizes of locations for traditional estimators of home range. We used area-under-the-curve to explore the fit of 8 estimators of home range to data collected with both GPS and concurrent very high frequency (VHF) technology on a terrestrial mammal, ...

Journal: :The Journal of the Institute of Television Engineers of Japan 1959

2015
Juliane I. Beier Jenny D. Jokinen Gretchen E. Holz Patrick S. Whang Amah M. Martin Nikole L. Warner Gavin E. Arteel Igor S. Lukashevich

Viral hemorrhagic fevers (VHFs) encompass a group of diseases with cardinal symptoms of fever, hemorrhage, and shock. The liver is a critical mediator of VHF disease pathogenesis and high levels of ALT/AST transaminases in plasma correlate with poor prognosis. In fact, Lassa Fever (LF), the most prevalent VHF in Africa, was initially clinically described as hepatitis. Previous studies in non-hu...

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