Results 41 to 50 of about 1,543 (216)

Correcting for optical aberrations using multilayer displays [PDF]

, 2012
Optical aberrations of the human eye are currently corrected using eyeglasses, contact lenses, or surgery. We describe a fourth option: modifying the composition of displayed content such that the perceived image appears in focus, after passing through ...
Brian A. Barsky, Douglas Lanman, Fu-Chung Huang, Huang F.-C., Ives F. E., Kee E., Lippmann G., Oyamada Y., Ramesh Raskar, Yellott J. I.   +9 more
core   +3 more sources

Solvent‐Induced Covalent Bond Softening Boosts Battery Voltage

Angewandte Chemie, EarlyView.
The strong attractive interaction between the nucleophilic center of the solvent and the electrophilic region of the covalently bonded cathode fragment triggers charge transfer. This results in the electron population in the antibonding orbital of the covalent bond, leading to bond weakening and elongation, and consequently increasing the cathode ...
Yanyan Wang, Zhijie Wang, Mengzi Geng, Chunzhen Yang, Guangchao Li, Jean‐Marie Tarascon, Biao Zhang   +6 more
wiley   +2 more sources

A Complex Wavelet-Based OTFS Scheme for LEO Satellite Communication

IEEE Access
This study investigates a wavelet-aided orthogonal time-frequency space (W-OTFS) modulation system operating in low earth orbit (LEO) satellite systems. The discrete wavelet transform (DWT) underlying the complex input signals (high-order modulation) is ...
Saifur Rahman Sabuj, Han-Shin Jo
doaj   +1 more source

Performance and evaluation of OTFS modulation systems using different high mobility channels [PDF]

International Journal of Electronics and Telecommunications
This research examines how Nextgen wireless systems can benefit from Orthogonal Time Frequency Space (OTFS) modulation in different high-mobility channel situations. We test the BER performance of OTFS and OFDM with varying lengths of symbol under varied
Sura H. Khadum, Thamer M. Jamel, Hassan F. Kkhazaal   +2 more
doaj   +1 more source

Better than a lens -- Increasing the signal-to-noise ratio through pupil splitting

, 2022
Lenses are designed to fulfill Fermats principle such that all light interferes constructively in its focus, guaranteeing its maximum concentration. It can be shown that imaging via an unmodified full pupil yields the maximum transfer strength for all ...
Becker, Jan, Deguchi, Takahiro, Förster, Ronny, Heintzmann, Rainer, Hübner, Uwe, Jügler, Alexander, Ries, Jonas   +6 more
core  

Peak-to-Average Power Ratio Reduction of OTFS Based on Precoding DFT-Spread

IEEE Access
Orthogonal time frequency space (OTFS) modulation can effectively combat the multipath and Doppler effects in doubly-selective channels, making it suitable for high-speed mobility scenarios.
Haiqing Guan, Zongmiao He, Xinyuan Yang, Changjia Qu, Yarui Zuo   +4 more
doaj   +1 more source

Discretized aperture mapping with a micro-lenses array for interferometric direct imaging [PDF]

, 2013
Discretized Aperture Mapping (DAM) appears as an original filtering technique easy to play with existing adaptive optics (AO) systems. In its essential DAM operates as an optical passive filter removing part of the phase residuals in the wavefront ...
Antichi, Jacopo, Carbillet, Marcel, Girard, Julien, Giro, Enrico, Jolissaint, Laurent, Mawet, Dimitri, Milli, Julien, Mourard, Denis, Patru, Fabien, Rabou, Patrick   +9 more
core   +4 more sources

Tuning Separator Chemistry: Improving Zn Anode Compatibility via Functionalized Chitin Nanofibers

Advanced Functional Materials, EarlyView.
Nanochitin derived from waste shrimp shells is used to fabricate separators for aqueous zinc batteries. By tuning the density of amine and carboxylic surface groups, water mobility at the separator interface is controlled, promoting uniform zinc deposition, suppressing dendrite growth, and enabling exceptional cycling stability exceeding 2000 h ...
Ibrahim Al Kathemi, Vishnu Arumughan, Mohamed Zbiri, Marcel Kröger, Ira Smal, Eero Kontturi, Roza Bouchal   +6 more
wiley   +1 more source

Wavelet-Aided OTFS: A 2-D Multicarrier Modulation Format for High-Mobility Communications

IEEE Open Journal of the Communications Society
This article proposes a wavelet-aided orthogonal time-frequency space (W-OTFS) modulation as a novel approach for high-mobility vehicular communication.
Mahmudul Hasan Abid, Iffat Ara Talin, Mohammad Abdul Matin, Mohammad Ismat Kadir   +3 more
doaj   +1 more source

Printed Organic Thermoelectric Generators: Progress and Challenges Towards Efficient Energy Harvesting

Advanced Materials Technologies, EarlyView.
Printed organic thermoelectric generators (OTEGs) enable flexible and sustainable energy harvesting from low‐grade heat. This Perspective critically assesses recent advances in printable thermoelectric materials, 2D and 3D device architectures, and current performance limits of printed OTEGs.
Vijitha Ignatious, Pietro Rossi, Matteo Massetti, Cecilia Mattevi, Francisco Molina‐Lopez, Mario Caironi   +5 more
wiley   +1 more source