Results 161 to 170 of about 15,797 (201)

An Approximate THD Theory for Journal Bearings

Journal of Tribology, 1990
The aim of this paper is to make available to the industrial designer results of the thermohydrodynamic theory of journal bearings, by providing a simplified, yet accurate model of journal bearing lubrication that can be implemented on a personal computer and be used in an interactive mode.
G. Gupta, C. R. Hammond, A. Z. Szeri
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Vapour pressure and heat capacities of metal organic precursors, Y(thd)3 and Zr(thd)4

Journal of Crystal Growth, 2004
Abstract The vapour pressure of two metal organic precursors, Y(thd) 3 [CAS RN: 15632-39-0] and Zr(thd) 4 [CAS RN: 18865-74-2] (thd=2,2,6,6-tetramethylheptane-3,5-dionate), used for metal organic chemical vapour deposition of high-temperature superconductor layers, was measured by a static method in the technologically important temperature range ...
Michal Fulem, Květoslav Růžička, Vlastimil Růžička, Tomislav Šimeček, Eduard Hulicius, Jiřı́ Pangrác   +5 more
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Normalization Calculation Method of THD for Aviation Multipulse Rectifiers

IEEE Transactions on Aerospace and Electronic Systems
Quanhui Li, Fangang Meng
exaly   +2 more sources

Islanding detection of wind farms by THD

2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, 2008
One of the most main protection requirements of grid connected wind turbines (WTs) is islanding detection and anti-islanding protection. In this paper, a new method for islanding detection of WTs based on THD of asynchronous generator currents is proposed. The new features of the proposed method are its application for wind farms with a large number of
H. Kazemi Karegar, A. Shataee
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High-PF and ultra-low-THD power factor correction controller by sinusoidal-wave synthesis and optimized THD control

2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), 2013
The proposed sinusoidal-wave synthesis (SWS) and the optimized THD control (OTC) improve power factor (PF) and total harmonic distortion (THD) over a wide line voltage range. The SWS detects the input line root-mean-square (rms) voltage to generate the digital equivalent code to the OTC for optimizing the THD by tuning the on-time value.
Chih-Wei Chang, Chia-Lung Ni, Jen-Chieh Tsai, Yi-Ting Chen, Chun-Yen Chen, Ke-Horng Chen, Long-Der Chen, Cheng-Chen Yang   +7 more
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Toward a Theory of Hierarchical Definability (THD)

2002
Attempts to formulate mathematically precise definitions of basic concepts such as causality, randomness and probability have a long history. The concept of hierarchical definability that is outlined in the following suggests that such definitions may not exist. Furthermore, it suggests that existing definitions of many basic concepts, among them those
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Reducing THD in an audio test instrument

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2012
A patented instrument has been developed for measuring SNR, SINAD, and THD for DACs and ADCs. For DACs, a synthesized source bucks the sine-wave source being measured. For ADCs, the sine-wave source is the input to the ADC under test. The quality of the THD measurement is limited by the harmonics generated by the source (less than −120dB).
Solomon Max, Richard Liggiero
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Defect studies on nonstoichiometric TiN by THDS

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1991
We have performed defect studies on Ti1N1.07 by means of thermal helium desorption spectrometry (THDS), a technique which uses helium as an inert atomic probe. First, the defects in the solid are decorated with helium by ion implantation. The helium is subsequently released as the sample is heated.
Wilbert H.B. Hoondert, Wim Th.M. Buters, Barend J. Thijsse, Arie van den Beukel   +3 more
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Low THD variable load buck PFC converter

2008 IEEE Power Electronics Specialists Conference, 2008
International standards impose several constraints concerning the electric power quality and require that the harmonic content of the line current of grid connected equipment is below assigned limits; for this reason operating of ac-dc converters with high power factor and low line current distortion has become essential.
SOLERO, LUCA, V. SERRAO, M. MONTUORO, A. ROMANELLI   +3 more
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Transanal Hemorrhoidal Dearterialization (THD)

2015
Hemorrhoids remain a highly prevalent anal disorder, affecting both genders over a wide age spectrum. Around half of these patients will experience symptoms to various degrees, most commonly presenting with per rectal bleeding, prolapse, or anal pain. Hemorrhoids originating above the dentate line are known as internal and those below the dentate line ...
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