Results 21 to 30 of about 36,513 (258)

An enhanced electrical impedance imaging algorithm for hyperthermia applications

International Journal of Hyperthermia, 1997
Electrical impedance imaging is a technique which is under investigation as a noninvasive method of tracking subsurface temperature distributions and/or associated cellular response during hyperthermia. In previous work, a finite element image reconstruction algorithm for converting surface potential distributions recorded at discrete electrode ...
K D, Paulsen, H, Jiang
openaire   +2 more sources

Enhancement of Ultrasonic Transducer Bandwidth by Acoustic Impedance Gradient Matching Layer

Sensors, 2022
High-performance broadband ultrasound transducers provide superior imaging quality in biomedical ultrasound imaging. However, a matching design that perfectly transmits the acoustic energy between the active piezoelectric element and the target medium ...
Ke Zhu, Jinpeng Ma, Xudong Qi, Bingzhong Shen, Yang Liu, Enwei Sun, Rui Zhang   +6 more
doaj   +1 more source

Bandwidth enhancement for QMSIW antenna by using dual cavity and triangle slot [PDF]

International Journal of Electronics and Telecommunications
The miniaturization of substrate-integrated waveguide (SIW) antenna suffers from the narrow impedance bandwidth. It occurs on the quarter mode substrate integrated waveguide (QMSIW) antenna that has 75% miniaturization of the full mode SIW. This research
Dian Widi Astuti, Juprida Parrona Purba, Muslim Muslim, Imelda Uli Vistalina Simanjuntak, Yuliza Yuliza, Fina Supegina, Syah Alam, Setiyo Budiyanto   +7 more
doaj   +1 more source

Microstrip Patch Antennas With Multiple Parasitic Patches and Shorting Vias for Bandwidth Enhancement

IEEE Access, 2018
Two novel microstrip patch antennas with multiple parasitic patches and shorting vias have been presented for the bandwidth enhancement. Based on the conventional triangular patch antenna, two more resonances can be obtained with the introduction of ...
Kai Da Xu, Han Xu, Yanhui Liu, Jianxing Li, Qing Huo Liu   +4 more
doaj   +1 more source

Polarization impedance measurement cavity enhanced laser absorption spectroscopy

Optics Express, 2021
We present a theoretical overview and experimental demonstration of a continuous-wave, cavity-enhanced optical absorption spectrometry method to detect molecular gas. This technique utilizes the two non-degenerate polarization modes of a birefringent cavity to obtain a zero background readout of the intra-cavity absorption.
Ya J. Guan, Chathura P. Bandutunga, Jiahao Dong, Timothy T.-Y. Lam, Roland Fleddermann, Malcolm B. Gray, Jong H. Chow   +6 more
openaire   +2 more sources

Achieving ultrahigh instantaneous power density of 10 MW/m2 by leveraging the opposite-charge-enhanced transistor-like triboelectric nanogenerator (OCT-TENG)

Nature Communications, 2021
TENG suffers from two fundamental limitations: high output impedance and low charge transfer. Herein, these limitations are circumvented by leveraging the opposite-charge-enhancement effect and transistor-like device design, thereby achieving the ...
Hao Wu, Steven Wang, Zuankai Wang, Yunlong Zi   +3 more
doaj   +1 more source

Enhanced Graphical Representation of Electrochemical Impedance Data

Journal of The Electrochemical Society, 2006
Bode plots, corrected for Ohmic resistance, logarithmic plots of the imaginary component of the impedance, and effective capacitance plots are shown to be useful complements to the more traditionally used complex-plane and Bode representations for electrochemical impedance data.
Orazem, Mark E., Pébère, Nadine, Tribollet, Bernard   +2 more
openaire   +4 more sources

Perfusion Enhancement with Respiratory Impedance After Stroke (PERI-Stroke) [PDF]

Neurotherapeutics, 2019
Intrathoracic pressure influences cardiac output and may affect cerebral blood flow (CBF). We aimed to quantify the cerebral hemodynamic response to intrathoracic pressure reduction in patients with acute ischemic stroke using a noninvasive respiratory impedance (RI) device.
Christopher G. Favilla, Rodrigo M. Forti, Ahmad Zamzam, John A. Detre, Michael T. Mullen, Arjun G. Yodh, Scott E. Kasner, David R. Busch, Wesley B. Baker, Rickson C. Mesquita, David Kung, Steven R. Messé   +11 more
openaire   +2 more sources

Performance Enhancement of Wearable Antenna Using High Impedance Surfaces

International Journal of Communication Networks and Information Security (IJCNIS), 2022
This paper presents a novel textile wearable antenna that has been designed to operate at Wi-Fi bands of 2.4GHz & 5.8GHz. Antenna performance in free space environment showed Gain of 1.8dBi at 2.4GHz and 4.5dBi at 5.8GHz. However, performance deteriorated when antenna was operated near human body which is lossy and complex in nature. For mitigating
Shahid Bashir, M. Salman Khan, Khadim Ullah Jan, Sadiq Ullah   +3 more
openaire   +2 more sources

Hybrid HMSIW Cavities Antenna With a Half-Pentagon Ring Slot for Bandwidth Enhancement

IEEE Access, 2023
A substrate-integrated waveguide (SIW) antenna is an implementation of a waveguide antenna in a microstrip antenna. The microstrip antenna, as a low-profile antenna, suffers from narrow impedance bandwidth.
Dian Widi Astuti, Yuyu Wahyu, Fitri Yuli Zulkifli, Eko Tjipto Rahardjo   +3 more
doaj   +1 more source