Results 61 to 70 of about 44,850 (204)

Review of Local Network Impedance Estimation Techniques

IEEE Access, 2020
As a result of increasing variability of network impedance, interest in impedance estimation techniques is growing. This review contextualises local impedance estimation techniques by providing a historical prospective on the uses of these techniques ...
Mathieu Kervyn De Meerendre, Eduardo Prieto-Araujo, Khaled H. Ahmed, Oriol Gomis-Bellmunt, Lie Xu, Agusti Egea-Alvarez   +5 more
doaj   +1 more source

Imaging Studies of Characteristics for a Slab of a Lossy Left-handed Material

, 2003
The characteristics of an imaging system formed by a slab of a lossy left-handed material (LHM) are studied. The transfer function of the LHM imaging system is written in an appropriate product form with each term having a clear physical interpretation ...
Garcia, Linfang Shen, Pendry, Sailing He, Shelby, Shen, Smith, Smith, Valanju, Veselago   +9 more
core   +1 more source

Dynamic impedance model of the skin-electrode interface for transcutaneous electrical stimulation. [PDF]

PLoS ONE, 2015
Transcutaneous electrical stimulation can depolarize nerve or muscle cells applying impulses through electrodes attached on the skin. For these applications, the electrode-skin impedance is an important factor which influences effectiveness.
José Luis Vargas Luna, Matthias Krenn, Jorge Armando Cortés Ramírez, Winfried Mayr   +3 more
doaj   +1 more source

Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers [PDF]

, 2009
Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device.
Hayward, Gordon, Mackintosh, Allan, Mulholland, Anthony, O'Leary, Richard, Pethrick, Richard, Ramadas, Sivaram Nishal, Troge, Alexandre   +6 more
core   +1 more source

Trait Impulsivity Impedes Maturing Out of Problem Drinking Among Socially Anxious Undergraduates

Alcohol and Alcoholism, 2020
Abstract Aims Alcohol use follows a developmental trajectory—steadily increasing and peaking in the early stages of emerging adulthood (e.g. first year of university) and declining thereafter. While most individuals ‘mature out’ of problem drinking as they move through emerging adulthood, some ...
Elena, Bilevicius, Chantal, Van Landeghem, Sherry H, Stewart, Simon B, Sherry, Matthew T, Keough   +4 more
openaire   +2 more sources

Polarity sensitive circuit Patent [PDF]

, 1968
Electric circuit for reversing direction of current ...
Smith, L. S.
core   +1 more source

Effect of Enhancement Material on the Performance of Ground Electrodes Under Impulse Conditions

IEEE Access
Among the factors that affect the soil resistivity is the chemical content in soil, where the ionic conduction is expectedly increased and the soil resistivity is reduced.
Usman Muhammad, Nurul Nadia Ahmad, Normiza Mohamad Nor, Fazlul Aman   +3 more
doaj   +1 more source

Impulse TDR and its application to measurement of antennas [PDF]

, 2011
The traditional stimulus signal used in a time-domain reflectometer (TDR) is a voltage step. We propose an alternative technique, whereby an impulse generator is employed in place of the step generator in a TDR.
McCabe, Steven Owen, Scott, Jonathan B.
core   +1 more source

Estimation of Effective Length of Type-A Grounding System According to IEC 62305-3 Using a Machine Learning Regression Model

Applied Sciences
Two types of grounding systems are recommended for use in the international standard IEC 62305-3, Part 3: Physical damage to structures and life hazard.
Dino Lovrić, Ivan Krolo, Ivica Jurić-Grgić   +2 more
doaj   +1 more source

Comparison of Motion Artefact Reduction Methods and the Implementation of Adaptive Motion Artefact Reduction in Wearable Electrocardiogram Monitoring

Sensors, 2020
A motion artefact is a kind of noise that exists widely in wearable electrocardiogram (ECG) monitoring. Reducing motion artefact is challenging in ECG signal preprocessing because the spectrum of motion artefact usually overlaps with the very important ...
Xiang An, George K. Stylios
doaj   +1 more source