A digital-coding programmable metasurface (DCPM) is a type of functional system that is composed of subwavelength-scale digital coding elements with opposite phase responses. By configuring the digital coding elements, a DCPM can construct dynamic near-field image patterns in which the intensity of each pixel of the image can be dynamically and independently modulated. Thus, a DCPM can perform both spatial and temporal modulations. Here, this advantage is used to realize multichannel direct transmissions of near-field information. Three points are selected in the near-field region to form three independent channels. By applying various digital phase codes on the DCPM, independent binary digital symbols defined by amplitude codes (namely, weak and strong amplitudes) are transmitted through the three channels. The measured near-field distributions and temporal transmissions of the system agree with numerical calculations. Compared with the conventional multichannel transmission, the proposed mechanism achieves simultaneous spatial and temporal modulations by treating DCPM as an energy radiator and information modulator, thereby enduing DCPM with high potential in near-field information processing and communications.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804601 | PMC |
| http://dx.doi.org/10.1038/s41377-019-0169-3 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Local and network changes after multichannel transcranial direct current stimulation using magnetoencephalography in patients with refractory epilepsy.
Clin Neurophysiol
December 2024
APHM, Timone Hospital, Epileptology and Cerebral Rhythmology, Marseille, France. Electronic address:
Objective: Non-invasive neuromodulation techniques, particularly transcranial direct current stimulation (tDCS), are promising for drug-resistant epilepsy (DRE), though the mechanisms of their efficacy remain unclear. This study aims to (i) investigate tDCS neurophysiological mechanisms using a personalized multichannel protocol with magnetoencephalography (MEG) and (ii) assess post-tDCS changes in brain connectivity, correlating them with clinical outcomes.
Methods: Seventeen patients with focal DRE underwent three cycles of tDCS over five days, each consisting of 40-minute stimulations targeting the epileptogenic zone (EZ) identified via stereo-EEG.
Semiconductive Coordination Polymer with Multi-Channel Charge Transfer for High-Performance Direct X-ray Detection.
Angew Chem Int Ed Engl
December 2024
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Coordination polymers (CPs) are promising for direct X-ray detection and imaging owing to higher designability and outstanding stability, however, it remains a challenge to achieve highly X-ray detection performance, particularly both high sensitivity and low detection limit at the same operating voltage. Herein, we construct a new conjugated CP {[Co(BPTTz)(DIPA)] ⋅ DMA} (1, BPTTz=2,5-bis(pyridine-4-yl)thiazolo[5,4-d]thiazole, HDIPA=2,5-diiodoterephthalic acid, DMA=N, N'-dimethylacetamide), with multi-channel charge transfer by regulating the linker mediated electronic-state, which reduces carrier losses resulting from recombination or quenching, enhances the efficiency of charge separation and transfer, thus further optimizes X-ray detection performance. The semiconductor prepared based on this strategy achieves record values including the highest mobility-lifetime product (μτ, 8.
View Article and Find Full Text PDFDCSENets: Interpretable deep learning for patient-independent seizure classification using enhanced EEG-based spectrogram visualization.
Comput Biol Med
December 2024
School of Medicine, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China. Electronic address:
Article Synopsis
- The study addresses the challenges neurologists face in analyzing multichannel EEG recordings for epileptic activities, proposing a computer-aided diagnosis system to minimize manual inspection.
- Researchers introduce a novel short-time Fourier transform (STFT) algorithm utilizing taper functions to enhance spectrogram resolution, which improves the interpretability of EEG signals essential for seizure detection.
- The developed Dilated Convolutional Squeeze and Excitation Networks (DCSENets) achieve a high average accuracy in patient-independent seizure classification while incorporating a visual explainer that enhances model interpretability, aiding neurologists in understanding diagnosis decisions.
COSMIC-2 RFI Prediction Model Based on CNN-BiLSTM-Attention for Interference Detection and Location.
Sensors (Basel)
December 2024
China Research Institute of Radiowave Propagation, Qingdao 266107, China.
As the application of the Global Navigation Satellite System (GNSS) continues to expand, its stability and safety issues are receiving more and more attention, especially the interference problem. Interference reduces the signal reception quality of ground terminals and may even lead to the paralysis of GNSS function in severe cases. In recent years, Low Earth Orbit (LEO) satellites have been highly emphasized for their unique advantages in GNSS interference detection, and related commercial and academic activities have increased rapidly.
View Article and Find Full Text PDFOne-step annealing in situ synthesis of low tortuosity corn straw cellulose biochar/FeC: Application for cathode catalyst in microbial fuel cell.
Int J Biol Macromol
December 2024
College of Art and Science, Northeast Agr Univ, Harbin 150030, China. Electronic address:
Synthesis of microbial fuel cell (MFC) cathode catalysts using corn straw with natural multi-channel structure is an useful measure for developing sustainable energy sources and making creative use of agricultural waste. The catalytic performance of nanomaterial catalysts in the oxygen reduction reaction (ORR) is clearly influenced by porosity and channel structure. Mesopores usually contribute to the enhancement of reaction kinetics and mass transfer.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!