نتایج جستجو برای: voltage high

تعداد نتایج: 2133910  

Journal: :Frontiers in Environmental Science 2022

Based on the high-resolution electromagnetic field intensity observed by DEMETER satellite, harmonic radiations in ionosphere closely above extra-high voltage and ultra-high power projects Chinese grid have been detected. In time-frequency spectrograms, these are characterized parallel spectral lines with spacings of 50, 100, 150, or 600 Hz. The highest frequency can reach approximately 8,850 p...

پایان نامه :دانشگاه آزاد اسلامی واحد علوم پزشکی تهران - دانشکده پزشکی 1389

هدف : هدف از این پایان نامه بررسی تغییرات الکترورتینوگرام در بیماران مبتلا به گلوکوم است . زیرا گلوکوم بیماری است که اگر دیر تشخیص داده شود یا درمان نشود منجر به کوری می شود . روش مطالعه : این مطالعه یک مطالعه مشاهده ای – توصیفی – تحلیلی – مقطعی طراحی شده که نمونه شامل 25 فرد مبتلا به گلوکوم و 25 فرد سالم بوده است نمونه ها بصورت تصادفی ساده از بین مراجعین به بیمارستان های آموزشی دانشگاه آزا...

2008
Keishirou Kumada Satoshi Yokoyama

Fuji Electric has developed processes to fabricate ICs. The process satisfies demands for a display driver IC of up to about 100V for a liquid crystal display (LCD), plasma display panel (PDP) and vacuum fluorescent display (VFD). The power control IC has up to about 40V of high voltage and high current analog signal control. The ICs are fabricated using the CMOS (complementary MOS) oxide isola...

2015
Hao-Yen Tang Berkeley

supply voltage system where low supply gates may feed into high supply gates energy savings for benchmark circuits in comparison when level converters are not allowed. of a level shifter circuit having a structure to reduce fall and rise. input voltage levels prohibit the use of direct-gate drive circuits for high-side signal are linked by a level shift circuit that must tolerate the high-volta...

1999
G. Azzopardi

A low voltage incremental analog-to-digital converter with a pipelined architecture is presented. Using first order modulators the conversion time is significantly reduced even at low sampling rates while maintaining high resolution. The switched capacitor converter is designed to operate with a 1.8V power supply and uses three pipelined modulators. With careful design and digital correction it...

Journal: :Nano letters 2011
Shu-Jen Han Keith A Jenkins Alberto Valdes Garcia Aaron D Franklin Ageeth A Bol Wilfried Haensch

While graphene transistors have proven capable of delivering gigahertz-range cutoff frequencies, applying the devices to RF circuits has been largely hindered by the lack of current saturation in the zero band gap graphene. Herein, the first high-frequency voltage amplifier is demonstrated using large-area chemical vapor deposition grown graphene. The graphene field-effect transistor (GFET) has...

2013
Ren KIMURA Kousuke UCHIDA Toru HIYOSHI Mitsuhiko SAKAI Keiji WADA Yasuki MIKAMURA

Recently, energy saving is strongly required to prevent global warming. Electricity is the most common energy form and is necessary in our daily life and various activities, because it is comparatively easy to utilize in transmission and conversion after generation. Therefore, it is very important to reduce energy loss in electric power systems and improve their efficiency. The present power sy...

1996
Gerald J. FitzPatrick Edward F. Kelley

A facility has been developed for the determination of the ratio of pulse high voltage dividers over the range from 10 kV to 300 kV using comparative techniques with Kerr electro-optic voltage measurement systems and reference resistive voltage dividers. Pulse voltage ratios of test dividers can be determined with relative expanded uncertainties of 0.4 % (coverage factor k = 2 and thus a two st...

2015
Hao-Yen Tang Berkeley

supply voltage system where low supply gates may feed into high supply gates energy savings for benchmark circuits in comparison when level converters are not allowed. of a level shifter circuit having a structure to reduce fall and rise. input voltage levels prohibit the use of direct-gate drive circuits for high-side signal are linked by a level shift circuit that must tolerate the high-volta...

Journal: :journal of operation and automation in power engineering 2007
j. fallah ardeshir a. ajami a. jalilvand a. mohammadpour

this paper proposes a flexible power electronic transformer (fpet) for the application in the micro-grids. the low frequency transformer is usually used at the point of common coupling (pcc) to connect the low voltage grid and utility network to each other. the conventional 50hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. in this pap...

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