Results 151 to 160 of about 7,393 (258)

Aqueous Supercapacitor with Wide‐Temperature Operability and over 100,000 Cycles Enabled by Water‐in‐Salt Electrolyte

ChemSusChem, Volume 18, Issue 6, March 15, 2025.
This study presents a symmetric supercapacitor with activated carbon electrodes and a “water‐in‐salt” electrolyte (WiSE) based on lithium perchlorate, offering over 100,000 cycles with over 90 % capacity retention. The supercapacitor operates efficiently from −20 to 80 °C, enhancing performance, stability, and all‐season operability.
Zahid Ali Zafar, Radim Weisser, Ghulam Abbas, Martin Silhavik, Prabhat Kumar, Jiří Červenka   +5 more
wiley   +1 more source

Ninja optimization algorithm based ultra wideband antenna electromagnetic band gap modeling via a generative adversarial network. [PDF]

Sci Rep
Alhussan AA, Khafaga DS, El-Kenawy EM, Abdelhamid AA, Ibrahim A, Singla MK, Gupta J, Gupta A, Thakur E, Eid MM.   +9 more
europepmc   +1 more source

A Co‐Designed Implicit‐Reset Path PFD and Current Mismatch Compensated CP Enabling Sub‐0.5% Mismatch and Dead Zone‐Free for Low‐Spur PLLs

International Journal of Circuit Theory and Applications, EarlyView.
A co‐designed implicit‐reset phase‐frequency detector (PFD) and nonlinear amplifier‐assisted charge pump (CP) achieve dead zone‐free operation from 10 MHz to 4.7 GHz with < 0.5% current mismatch without calibration, enabling −80 dBc of reference spur and 0.50 ps of RMS jitter in a 180 nm of CMOS PLL.
A. Ghaemnia, Jincheng Yang, Xiaojiong Fei, G. Zhang   +3 more
wiley   +1 more source

Ultra-Wideband Double-Pentagonal Fractal Antenna for C-, X-, Ku- and K-Band Wireless Applications. [PDF]

Micromachines (Basel)
Kim J, Jang T, Lim S.
europepmc   +1 more source

An Ultra‐Low‐Power Biopotential Acquisition Analog Front‐End Chip for Wearable Devices

International Journal of Circuit Theory and Applications, EarlyView.
A 0.8‐V, 1.2‐μW biopotential AFE combines a chopper‐stabilized CCIA with dual‐time‐scale EDO management. The slow DSL preserves > 1 GΩ input impedance, whereas an event‐triggered fast‐recovery path shortens return to the linear range after abrupt electrode‐offset disturbances. ABSTRACT A 0.8‐V, 1.2‐μW biopotential analog front‐end (AFE) IC is presented
Zhang Xin, Yang Tianqi, Xu Wei, Wang Shun, Xiaoxi Ma   +4 more
wiley   +1 more source

A Complete Solution for Ultra-Wideband Based Real-Time Positioning. [PDF]

Sensors (Basel)
Ratiu V, Ratiu O, Smeyers OR, Dadarlat VT, Vos S, Rednic A.   +5 more
europepmc   +1 more source

Advances in vital‐sign prediction and early‐warning models for underground coal mine workers integrating environmental factors

Deep Underground Science and Engineering, EarlyView.
This review synthesizes advances in predicting miners' vital signs by integrating environmental monitoring (dust, temperature, and gas) with physiological data. It highlights multi‐source data fusion techniques and early‐warning models for enhanced occupational safety in underground coal mines.
Junji Zhu, Dawei Cui, Yingjie Liu, Yuntao Liang, Yue Zhang   +4 more
wiley   +1 more source

Developing and examining a compact dual band circularly polarized ultra-wideband antenna covering C-band and X-band applications. [PDF]

Sci Rep
Kolusu D, Nanda S.
europepmc   +1 more source

Low‐Dimensional Materials and Van Der Waals Heterostructures for Energy Application: A Comprehensive Review

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Low‐dimensional materials (0D, 1D, and 2D) exhibit unique electronic and physicochemical properties, enabling advanced nanoelectronic and optoelectronic devices. Mixed‐dimensional heterostructures combine these materials to enhance functionality.
Qaisar Alam, Sajjad Ali, Pir Muhammad Ismail, ABM Sharif Hossain   +3 more
wiley   +1 more source

Wireless trigger distribution with nanosecond jitter based on ultra-wideband transceiver modules. [PDF]

HardwareX
Korsimaa J, Weber M, Hæggström E, Salmi A.   +3 more
europepmc   +1 more source