Results 71 to 80 of about 17,978 (221)

10.5 T In Vivo Head Imaging With Universal RF Shimming

Magnetic Resonance in Medicine, Volume 95, Issue 5, Page 2776-2785, May 2026.
ABSTRACT Purpose Brain MR imaging at 10.5 T ultra‐high field offers significant improvements in signal‐to‐noise ratio (SNR), but faces challenges with B1+ inhomogeneity. Parallel‐transmission (pTx) can be used to achieve a more uniform RF field distribution, but necessitates the use of B1+ calibration in the region of interest.
Young Woo Park, Simon Schmidt, Wolfgang Bogner, Gregory J. Metzger, Małgorzata Marjańska   +4 more
wiley   +1 more source

A Method for Separating Multisource Partial Discharges in a Substation Based on Selected Bispectra of UHF Signals

Applied Sciences, 2020
A method for separating multisource partial discharges (PDs) in a substation is proposed based on selected bispectra of ultrahigh frequency (UHF) electromagnetic waves. Bispectra are sensitive to Gaussian noises and processes of symmetrical distribution.
Zhimin He, Huijuan Hou, Yiming Zang, Gehao Sheng, Xiuchen Jiang   +4 more
doaj   +1 more source

Evaluation of prediction accuracy for the Longley-Rice model in the FM and TV bands [PDF]

, 2013
Accurate geographical coverage predictions maps for FM and TV are needed for channel and frequency allocations and in order to avoid unwanted interferences.
Bizopoulos, Aristotelis, Cosmas, John, Kasampalis, Stylianos, Lazaridis, Pavlos, Zaharis, Zaharias D.   +4 more
core  

Rational Device Design and Doping‐Controlled Performance in Fast‐Response π‐Ion Gel Transistors

Advanced Functional Materials, Volume 36, Issue 29, 9 April 2026.
π‐Ion gel transistors (PIGTs) achieve extraordinary transconductance and stability through device configuration optimization, high‐mobility conjugated polymer selection, and hole scavenger doping. The optimized PIGTs maintain performance on flexible substrates, enabling printed, fast‐response, and wearable electronics.
Masato Kato, Soh Kushida, Nafees Umar Draz, Dan Kyotani, Emanuel Smarsly, Kyota Yoshinaga, Wenhao He, Uwe H. F. Bunz, Kazuhiro Marumoto, Tatsuya Mori, Yohei Yamamoto   +10 more
wiley   +1 more source

Systematic Benchmarking of a Noise‐Tolerant Conductive Hydrogel Electrode for Epidermal Bioelectronics

Advanced Science, Volume 13, Issue 20, 9 April 2026.
General schematic of the approach. Abstract Conventional Silver/Silver Chloride (Ag/AgCl) electrodes remain the clinical standard for electrophysiological monitoring but are hindered by poor skin conformity, mechanical rigidity, and signal degradation, particularly under motion or sweat.
Nazmi Alsaafeen, Ioannis Ziogas, Shirina Alsaedi, Mouza Alshehhi, Shahd Almheiri, Adil Rehman, Khulood Al Shehhi, Hani Saleh, Ahsan Khandoker, Charalampos Pitsalidis, Antoun Khawaja, Anna‐Maria Pappa   +11 more
wiley   +1 more source

A Compact Dual-Band RFID Tag Antenna Mountable on Metallic Objects

International Journal of Antennas and Propagation, 2015
A compact (50 × 50 × 4 mm3) dual-band radio frequency identification (RFID) tag antenna mountable on metallic objects is proposed for the ultra-high frequency (UHF) band (917∼923.5 MHz) and the microwave (MW) band (2.4∼2.45 GHz).
Byeonggwi Mun, Yonghyun Yoon, Hyunwoo Lee, Hark-Yong Lee, Byungje Lee   +4 more
doaj   +1 more source

Compact UHF/VHF Monopole Antennas for CubeSats Applications

IEEE Access, 2020
In this paper, two compact monopole antennas working at 149 MHz (VHF) and 398 MHz (UHF) are proposed for CubeSats applications. Two monopole antennas are integrated on a double layer ceramic substrate. The overall dimensions of the folded antenna are 101
Xiang Zhang, Fu Sun, Guoxuan Zhang, Liming Hou   +3 more
doaj   +1 more source

Resonance-Based microwave technique for body implant sensing [PDF]

, 2019
There is an increasing need for safe and simple techniques for sensing devices and prostheses implanted inside the human body. Microwave wireless inspection may be an appropriate technique for it.
Amorós García de Valdecasas, Susana, Bayés Genis, Antoni, González López, Giselle, Gálvez Montón, Carolina, Jofre Roca, Lluís, O'Callaghan Castellà, Juan Manuel, Rodríguez Leor, Oriol   +6 more
core   +3 more sources

Enclosure and Camouflage Design of a Prototype Remote Monitoring System for the Protection and Conservation of Territories in the Colombian Amazon Rainforest

Ecology and Evolution, Volume 16, Issue 4, April 2026.
Enclosure and camouflage design to protect electronic equipment of a Remote Monitoring System used for the conservation of Colombian Amazon Rainforest. ABSTRACT Increasing pressure on the Amazon rainforest from illegal mining and deforestation threatens biodiversity.
María Barajas, Jorge Torres, Paula Ortiz, Andrés Triana, Margarita Varon   +4 more
wiley   +1 more source

First In Vivo 23Na Human Imaging at 10.5 T Using a Combined Sodium‐Proton Transceiver Body Array

Magnetic Resonance in Medicine, Volume 95, Issue 4, Page 2429-2441, April 2026.
ABSTRACT Purpose To demonstrate the first in vivo human 23Na MRI at 10.5 T using a novel dual‐tuned transceiver body array and to evaluate a self‐gating approach for respiratory motion compensation, focusing on renal imaging. Methods A custom‐built eight‐channel 23Na‐loop 1H‐dipole transceiver array was designed, constructed, and characterized.
Simon Schmidt, Arcan M. Ertürk, Gregory J. Metzger   +2 more
wiley   +1 more source