Results 141 to 150 of about 7,039 (276)

Intelligent reflecting surfaces based offset index modulation for MIMO systems [PDF]

In this paper, we introduce the concept of offset to the field of intelligent reflecting surfaces-based index modulation (IRS-IM) and propose an IRS-based offset IM (IRSOIM) scheme. The IRS-OIM scheme not only divides the IRS elements into several blocks
Hai, H, Mumtaz, S, Zhang, G, Xu, L, Jiang, X-Q   +4 more
core   +1 more source

3D‐Printed Piezoionic/Bioelectronic Hydrogel for Electro‐Metabolic Regulation of Osteogenic Differentiation

Advanced Healthcare Materials, EarlyView.
A 3D‐printed piezoionic GPMx hydrogel enables stable electromechanical signal generation under mechanical loading, exhibiting long‐term durability and low fatigue. As a bioactive patch, it restores endogenous bioelectricity to stimulate osteogenesis via Ca2+ influx and mitochondrial activation, while simultaneously enabling label‐free alkaline ...
Sayan Deb Dutta, Myoung Joon Jeon, Youjin Seol, Ki‐Taek Lim   +3 more
wiley   +1 more source

Fewer Surfaces, Stronger Links: EMI-Aware IRS Number, Placement, and Phase Design Under Rate Guarantees

IEEE Access
Intelligent Reflecting Surfaces (IRSs) have emerged as a promising approach to enhancing wireless communication performance by reconfiguring the propagation environment in a passive, energy-efficient manner. However, determining the optimal number of IRS
Rhana Elsayed, Esraa M. Eid, Adly S. Tag Eldien, Mostafa Fouda, Mohamed I. Ismail, Shimaa S. Ali   +5 more
doaj   +1 more source

Neutrophil‐Mimetic MRI Enables Ultra‐Early Detection of Vascular Inflammation After Stroke

Advanced Healthcare Materials, EarlyView.
In this study, we developed neutrophil‐mimetic MRI probes that detect ultra‐early neuroinflammation following ischemic stroke by targeting E‐selectin. Within seconds of their injection, these microparticles mimic initial leukocyte adhesion to the activated cerebral endothelium.
Marion Isabelle Morvan, Damien Levard, Eloïse Lemarchand, Amal Boublay, Charly Helaine, Jolan Malherbe, Mikaël Naveau, Didier Goux, Igor Khalin, Ankita Talukdar, Cheun Pelleter, Charlène Jacqmarcq, Erwan Baudron, Isabelle Bardou, Sara Martinez de Lizarrondo, Maxime Gauberti, Denis Vivien, Antoine Philippe Fournier   +17 more
wiley   +1 more source

Dynamic channel estimation in large-scale massive MIMO systems with intelligent reflecting surfaces: Leveraging Khatri-Rao factorization and bilinear alternating least squares

Ain Shams Engineering Journal
In large-scale massive MIMO systems with intelligent reflecting surfaces (IRS), dynamic channel estimation (CE) is essential for optimizing the system performance and ensuring reliable communication.
E. Elakkiyachelvan, R.J. Kavitha
doaj   +1 more source

Performance of Massive MIMO Aided by Reflective Intelligent Surfaces

Journal of Network and Systems Management
Abstract Reflective intelligent surfaces (RIS) are large passive panels with hundreds or thousands of passive reflective meta- surface sensors, with the ability to electronically adjust the angle- of-departure (AoD) of the incident signal but not to apply any amplification and signal processing to the radio frequency signal.
Andre Flaiban, Taufik Abrão
openaire   +1 more source

Atomic Layer Deposition Processes: Versatile Platforms for Engineering ZnO‐Chitosan Biointerfaces

Advanced Healthcare Materials, EarlyView.
Vapour phase metalation (VPM), multiplied pulsed vapour phase infiltration (MPI), and O2 plasma‑enhanced atomic layer deposition (PEALD) tailor Zn–chitosan (Zn‑CS) films. PEALD improves wettability and biocompatibility. MPI enhances semiconductor behavior. Antiseptic selectivity: VPM → E. coli; MPI → H. pylori.
Mabel Moreno, Anjana Devi, David Zanders, Miryam Arredondo, Davide Mariotti, Ruairi McGlynn, Sindy Devis, Simón Guerrero, Eglantina Benavente, Matias Alegría, Yusser Olguin, Lorena Lobos‐Gonzalez, Kevin Guzmán, Elizabeth Rivas‐Yañez, Paula Solar, Valentin Cepus, Michael Krause, Luis Velásquez   +17 more
wiley   +1 more source

Advanced beamforming and reflection control in intelligent reflecting surfaces with integrated channel estimation

IET Microwaves, Antennas & Propagation
Intelligent Reflecting Surfaces (IRS) enhance wireless communication by optimising signal reflection from the base station (BS) towards users. The passive nature of IRS components makes tuning phase shifters difficult and direct channel measurement ...
Sakhshra Monga, Anmol Rattan Singh, Nitin Saluja, Chander Prabha, Shivani Malhotra, Asif Karim, Md. Mehedi Hassan   +6 more
doaj   +1 more source

Intelligent Reflecting-Surface-Aided Orbital Angular Momentum Divergence-Alleviated Wireless Communication Mechanism

Network
Orbital angular momentum (OAM) beams exhibit divergence during transmission, which constrains the capacity of communication system channels. To address these challenges, intelligent reflecting surfaces (IRSs), which can independently manipulate incident ...
Qiuli Wu, Yufei Zhao, Shicheng Li, Yiqi Li, Deyu Lin, Xuefeng Jiang   +5 more
doaj   +1 more source

Immunoinflammatory Mechanisms and Biocompatibility of Bioactive Dental Biomaterials: From Fundamental Insights to Clinical Translation

Advanced Healthcare Materials, EarlyView.
Surface‐host dialogue at the implant interface governs biological fate and osseointegration. Surface physicochemical properties of titanium (Ti) dental implants, including microgrooves, nanopatterns, nanotopography, roughness, and wettability, modulate the initial adsorption of proteins and the formation of a dynamic biointerface.
Daniela Moreira Cunha, Amanda Paino Santana, Marta Maria Alves Pereira, Mariana Martins Guerreiro, Jose Mauro Granjeiro, Jamil Awad Shibli, Jeroen J. J. P. van den Beucken, Anton Sculean, Rafael Scaf de Molon, Erica Dorigatti de Avila   +9 more
wiley   +1 more source