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  • shown
  • In fact, it is shown by this study that the electrochemical impedance behavior of mortars varies in the process of carbonation. (mdpi.com)
  • capacitance
  • The introduction of the concept of impedance in AC circuit is justified by the fact that there are two additional impeding mechanisms to be taken into account besides the normal resistance of DC circuits: the induction of voltages in conductors self-induced by the magnetic fields of currents (inductance), and the electrostatic storage of charge induced by voltages between conductors (capacitance). (wikipedia.org)
  • These can generate an impedance equivalent to a negative inductance or capacitance. (wikipedia.org)
  • Device
  • To overcome this difficulty it has been proposed to provide a device known as a gyrator, which has the property of producing at one port an impedance which is proportional to the inverse of the impedance connected across another port, so that if a capacitor is connected across the other port the device, together with the capacitor, when viewed from the one port behaves like an inductor. (google.com)
  • We used a commercial impedance sensing device (ECIS®) to assess the migration of the cells following irradiation. (aps.org)
  • A dummy load is a device used to simulate an electrical load, usually for testing purposes. (wikipedia.org)
  • Webster
  • John O.G. Webster is an American electrical engineer and a founding pioneer in the field of biomedical engineering. (wikipedia.org)
  • In his spare time, Webster works with undergraduate biomedical engineering design teams at the University of Wisconsin-Madison, including ongoing projects with impedance cardiography and atrial fibrillation. (wikipedia.org)
  • electrodes
  • Time difference EIT (td-EIT) has one major advantage over absolute EIT (a-EIT): inaccuracies resulting from interindividual anatomy, insufficient skin contact of surface electrodes or impedance transfer can be dismissed because most artifacts will eliminate themselves due to simple image subtraction in f-EIT. (wikipedia.org)
  • For the two dimensional inverse electrical impedance problem in the case of piecewise constant conductivities with the currents injected at adjacent point electrodes and the resulting voltages measured between the remaining electrodes, in the authors proposed a nonlinear integral equation approach that extends a method that has been suggested by Kress and Rundell for the case of perfectly conducting inclusions. (aimsciences.org)
  • current
  • This means, that a part of the electric current leaves the transverse plane and results in an impedance transfer. (wikipedia.org)
  • The electrical current is so small that it can not be felt at all. (thebody.com)
  • Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied. (wikipedia.org)
  • Quantitatively, the impedance of a two-terminal circuit element is the ratio of the complex representation of a sinusoidal voltage between its terminals to the complex representation of the current flowing through it. (wikipedia.org)
  • the phase of the complex impedance is the phase shift by which the current lags the voltage. (wikipedia.org)
  • If cell shape changes occur, the current pathways through and around the cell bodies change as well, leading to a corresponding increase or decrease of impedance. (wikipedia.org)
  • This then causes more channels to open, producing a greater electric current across the cell membrane, and so on. (wikipedia.org)
  • The devices are handheld and are pressed against the skin area corresponding to a specific muscle group, an electrical current flows, impedance is measured and the output is a muscle quality score. (wikipedia.org)
  • In this case, the phase angle is the phase difference between the voltage applied to the impedance and the current driven through it. (wikipedia.org)
  • A fault current limiter is a nonlinear element which has a low impedance at normal current levels, but presents a higher impedance at fault current levels. (wikipedia.org)
  • From 1959 until 1973 Ranck analyzed the flow of electric current in brain, electrical properties of glia, electric impedance of brain, release of potassium from neurons in a seizure, and which elements are activated in electric stimulation of brain. (wikipedia.org)
  • Alternatively, the electrical units can be related to the mechanical units by defining, for example, a unit of current that gives a specified force between two wires, or a unit of charge that gives a unit of force between two unit charges. (wikipedia.org)
  • Grid
  • This poses a particular problem when distributed generation, such as wind farms and rooftop solar power, is added to an existing electric grid. (wikipedia.org)
  • imaginary
  • The network consequently must consist entirely of inductors and capacitors and the impedance will be purely an imaginary number with zero real part. (wikipedia.org)
  • frequencies
  • The impedances were obtained at 10 kHz and 100 kHz frequencies and at three body sites - upper arm (Large Intestine meridian), thigh (Liver), and lower leg (Bladder). (harvard.edu)
  • We found significantly reduced electrical impedance at the Large Intestine meridian compared to adjacent control for both frequencies. (harvard.edu)
  • increases
  • Using a unique and proprietary concept of magnetic-flux alteration - requiring no superconducting or cryogenic components - the self-triggered FCL instantaneously increases its impedance tenfold upon fault condition. (wikipedia.org)
  • procedure
  • Bio-electrical Impedance Analysis (BIA) is a simple painless procedure which enables a doctor or healthcare provider to analyze the amounts of fat, muscle and water in the body. (thebody.com)
  • liver
  • In this study we assess the feasibility of electrical impedance tomography (EIT) to track the temperature changes during ablation in an ex-vivo ovine liver and in-vivo porcine model. (spie.org)
  • In the porcine model ventilation artefact was removed by low pass filtering and successful ablation related impedance change image sequences were reconstructed from four of nine liver ablations. (spie.org)
  • amplifiers
  • Used for small venue PA cabinets and small stage monitor speakers (with a horn), and lightweight bass guitar or electric guitar combination amplifiers ("combos") and cabinets designed for rehearsal monitoring or practice. (wikipedia.org)
  • cell
  • Scientists experimented with variations on this model until 1940, when Kenneth Cole developed a circuit model that accounted for the impedance properties of both cell membranes and intracellular fluid. (wikipedia.org)
  • Electric cell-substrate impedance sensing or ECISTM (a trademark of Applied BioPhysics Inc.) refers to a non-invasive biophysical approach to monitor living animal cells in vitro, i.e. within a well-defined laboratory environment. (wikipedia.org)
  • In confluent cell layers the measured impedance is mainly determined by the three-dimensional shape of the cells. (wikipedia.org)
  • The electrical properties of a cell are determined by the structure of the membrane that surrounds it. (wikipedia.org)
  • changes
  • Impedance changes in lung ventilation are investigated in mechanically ventilated patients who routinely undergo bronchoscopy in intensive care medicine. (clinicaltrials.gov)
  • quantities
  • The rapid rise of electrotechnology in the last half of the 19th century created a demand for a rational, coherent, consistent, and international system of units for electrical quantities. (wikipedia.org)
  • model
  • Interest in electrical impedance dates back to the turn of the 20th century, when physiologist Louis Lapicque postulated an elementary circuit to model membranes of nerve cells. (wikipedia.org)
  • case
  • Electric power distribution systems include circuit breakers to disconnect power in case of a fault, but to maximize reliability, they wish to disconnect the smallest possible portion of the network. (wikipedia.org)
  • Transmission Line
  • Electromagnetic waves traveling along Transmission Line (TL) enter in soil medium whose impedance is different from TL a part of the energy is reflected back to transmitter. (wikipedia.org)