The impedance of the middle-ear air space was measured on three human cadaver ears with complete mastoid air-cell systems. Below 500 Hz, the impedance is approximately compliance-like, and at higher frequencies (500-6000 Hz) the impedance magnitude has several (five to nine) extrema. Mechanisms for these extrema are identified and described through circuit models of the middle-ear air space. Th...

in this study, we explained a nanobiosensor for dna sequence detection, featuring sequence specificity, cost efficiency, speed, and ease of use. without the need for labels or indicators, it may be ideal for the detection of biological agents. this review describes recent advances in electrochemical impedance spectroscopy (eis) with an emphasis on using nanoparticles and nanotechnology. a power...

Electrical Impedance Tomography (EIT) is relatively a new imaging technique with which the images of the internal impedance of the region of interest in human body can be constructed effectively without prolonged exposure to radiations. EIT is fast, inexpensive and portable as compared to other imaging techniques. The presented work focuses on construction of human organ images acquired from im...

A new impedance boundary condition method for calculating the series impedance of lossy quasi-TEM transmission lines is presented. Previous techniques using a more standard impedance boundary condition are typically limited to high frequency where the impedance boundary conditions can be easily approximated due to its localized characteristics in that limit. The new impedance boundary condition...

Variations in the acoustic impedance throughout cells and tissue can be used to gain insight into cellular microstructures and the physiologic state of the cell. Ultrasound imaging can be used to create a map of the acoustic impedance, on which fluctuations can be used to help identify the dominant ultrasound scattering source in cells, providing information for ultrasound tissue characterizati...

BACKGROUND The motion artifact is an ever-present challenge in the mobile monitoring of surface potentials. Skin-electrode impedance is investigated as an input parameter to detect the motion artifact and to reduce it using various methods. However, the impact of the used impedance measurement frequency on the relationship between measured impedance and the motion artifact and the relationship ...

Abstract Eocene Sokor-1 reservoir is intrinsically heterogeneous and characterized by low-contrast low-resistivity log responses in parts of the Termit subbasin. Discriminating lithology fluid properties using petrophysics alone complicated undermines characterization. Petrophysics rock physics were integrated through diagnostics (RPDs) modeling for detailed description microstructure quality P...

Background: To investigate reliability of Bio-impedance Cardiometer parameters in comparison with basic non-invasive for early detection haemodynamic changes during percutaneous nephrolithotomy (PNL) under spinal anesthesia.Methods: Forty patients were enrolled. Basal and 10-min interval recorded, included systolic blood pressure, mean arterial heart rate, O2 saturation bio-impedance parameters...

In the design of a low noise amplifier,LNA, or mixer driver stage there exists an optimal source source impedance to provide the maximum power transfer into the transistor and thus the maximum gain. There also exists an optimal source impedance, Znopt, to provide the minimum noise figure for the circuit. At the maximum power source impedance, Zpopt, the input is matched to the source impedance ...