نتایج جستجو برای: electric frequency measurement

تعداد نتایج: 1021894  

2015
Irina Kolosok Elena Korkina Liudmila Gurina

Electric power system is a critical infrastructure and loss of its resilience and/or operability can lead to negative consequences for the national economy. Modern power systems based on sophisticated computer and communication technologies are characterized by elevated vulnerability to different types of unauthorized malicious access, i.e. cyber-attacks. Wide area measurement system which is b...

2013
Joonsung Lee Yizhuang Song Narae Choi Sungmin Cho Jin Keun Seo Dong-Hyun Kim

Anisotropic electrical properties can be found in biological tissues such as muscles and nerves. Conductivity tensor is a simplified model to express the effective electrical anisotropic information and depends on the imaging resolution. The determination of the conductivity tensor should be based on Ohm's law. In other words, the measurement of partial information of current density and the el...

2008
Alexander Paier Johan Karedal Thomas Zemen Nicolai Czink Charlotte Dumard Fredrik Tufvesson Christopher Mecklenbrauker Andreas Molisch Christoph F. Mecklenbräuker Andreas F. Molisch

This paper presents a description of an extensive vehicle-to-vehicle and vehicle-to-infrastructure channel measurement campaign conducted in the year 2007, in lund, Sweden. We focused on 4 X 4 Multiple-input multiple-output (MIMO) measurements at a center frequency of 5.2 GHz with high Doppler resolution. One vehicle-to-vehicle measurement data set where the two vehicles are traveling in opposi...

Journal: :فیزیک زمین و فضا 0
بهروز اسکویی احمدعلی بهروزمند

magnetotelluric (mt) method is an important passive surface geophysical method which uses the earth’s natural electromagnetic fields to investigate the electrical resistivity structure of the subsurface. the depth of investigation of mt is much higher than that of other electromagnetic (em) methods (vozoff, 1991). for a general conductivity distribution in the earth, the horizontal electric fie...

Electric motors are the largest consumer of world electric energy, consuming more than twice as much as lighting, the next largest consumer. Electric motors account for between 43 and 46% of all global electricity consumption approximately. They give rise to about 6 040 Mt of CO2 emissions. End‐users approximately spend USD 565 billion per year on electricity [1]. In recent years...

ژورنال: ارگونومی 2015
عزیزی, مهتاب, علی‌آبادی, محسن , گلمحمدی, رستم,

Introduction: In recent years, compact fluorescent lamps have been more widely used across the country as a means of optimizing energy consumption. Given the health consequences of lighting sources, the present study was conducted to investigate the intensity of electromagnetic fields emitted by common compact fluorescent lamps. Materials and Methods: The study examined 54 compact fluo...

Abbass Aghajani Jalil Jamali Mehdi Shirani, Saeed Shabani

Electric motors are the largest consumer of world electric energy, consuming more than twice as much as lighting, the next largest consumer. Electric motors account for between 43 and 46% of all global electricity consumption approximately. They give rise to about 6 040 Mt of CO2 emissions. End‐users approximately spend USD 565 billion per year on electricity [1]. In recent years, increase in e...

2005
C. K. Wong F. G. Shin

We have investigated the effects of electrical conductivity of the constituents on the dielectric and piezoelectric properties of ferroelectric 0-3 composites. The time-dependent internal electric fields are first derived, which can be induced by an applied ac field in dielectric measurement or stress in piezoelectric measurement. Our previously developed model fC. K. Wong, Y. M. Poon, and F. G...

2012
C. Tremola E. Páez D. Ormeño A. Rebolledo

Based upon the standard IEEE 1309, a new calibration method for electromagnetic (EM) probes is proposed. The aforementioned method compares the electric field strength measured with the EM probe subject to calibration with the E-field intensity calculated through a linear interpolation of the corrected measurement using a reference EM probe. The corrected measurement results are computed by mea...

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