Results 51 to 60 of about 304 (202)

Disentangling Bulk and Surface Contributions to Charge and Discharge Fading in High‐Voltage LiCoO2

Advanced Functional Materials, EarlyView.
High‐voltage operation of LiCoO2 accelerates capacity fading through bulk and surface degradation. By introducing a LiTaO3 coating to selectively suppress surface degradation, bulk and surface contributions to charge and discharge fading are decoupled.
Hyungjoon Moon, Sangbin Park, Jaewoo Jung, Seongeun Lee, Chanwoo Jung, Min‐Sik Park, Won‐Sub Yoon   +6 more
wiley   +1 more source

Dual-Chirp Photonics-Based Radar for Distance and Velocity Measurement Based on Compressive Sensing

IEEE Photonics Journal, 2022
We proposed a dual-chirp microwave photonic radar based on compressive sensing for distance and velocity measurement. This radar can generate different chirp linear frequency modulated (LFM) signals using a dual-parallel Mach-Zehnder modulator (DPMZM ...
Yujiao Ding, Shuxu Guo, Hao Wu, Di Wang, Jiaqi Li, Yang Yang, Fengtao Cui, Wei Dong   +7 more
doaj   +1 more source

Predecision for Wideband Spectrum Sensing With Sub-Nyquist Sampling

IEEE Transactions on Vehicular Technology, 2017
Built on compressed sensing theories, sub-Nyquist spectrum sensing (SNSS) has emerged as a promising solution to the wideband spectrum sensing problem. However, most of the existing SNSS methods do not distinguish if primary users (PUs) are present or absent in the concerned spectrum band and directly pursue support recovery of the PUs.
Tianyi Xiong, Hongbin Li 0001, Peihan Qi, Zan Li 0001, Shilian Zheng   +4 more
openaire   +1 more source

2D Co‐Assembly of Solid Acids Enables Stable Superprotonic Conduction Above 260°C

Advanced Functional Materials, EarlyView.
A two‐dimensional co‐assembly strategy integrates antimony phosphate and phosphotungstic acid nanosheets into free‐standing inorganic lamellar membranes with confined acid–acid interfaces. The resulting interfacial hydrogen‐bond network enables anhydrous proton conductivity exceeding 0.1 S cm−1 at 260°C and supports stable high‐temperature fuel‐cell ...
Qiuning Li, Kaiqiang He, Dehua Dong, Fanmengjing Wang, Xiangcheng Liu, Zhikao Li, Jacek J. Jasieniak, Paul A. Webley, Huanting Wang   +8 more
wiley   +1 more source

Sub-Nyquist SAR Based on Pseudo-Random Time-Space Modulation

Sensors, 2018
Sub-Nyquist sampling technology can ease the conflict between high resolution and wide swath in a synthetic aperture radar (SAR) system. However, the existing sub-Nyquist SAR imposes a constraint on the type of the observed scene and can only reconstruct
Wenjiao Chen, Chunsheng Li, Ze Yu, Peng Xiao   +3 more
doaj   +1 more source

Balancing Hydrophobicity and Hydrophilicity: Dual Filler‐Engineered Proton Exchange Membranes for Durable, High‐Power Fuel Cells

Advanced Functional Materials, EarlyView.
Polarity‐matched Zr–MOFs program Nafion's nanoscale morphology during solution casting. Hydrophilic UiO‐66 preserves hydrated pathways, while hydrophobic UiO‐67 increases the proton hopping sites by densifying ionic clusters. Combining both fillers yields a membrane that delivers 176 mS cm−1 conductivity, reaches 1.46 W cm−2 under 200 kPa, and triples ...
Yonghwi Cho, Yunseong Ji, Minkyu Choi, Junsu Kim, Yejin Kim, Su Jeong Lee, Wooyoung Choi, Choong Hoo Lee, Ju Yeon Kim, Ohchan Kwon, Hanim Kim, Du Yeol Ryu, Ki Chul Kim, Dae Woo Kim   +13 more
wiley   +1 more source

Low-Complexity Autocorrelation-Based OFDM Detection Under Sub-Nyquist Sampling

IEEE Access
Sub-Nyquist sampling has emerged as an attractive approach for reducing the hardware complexity and computational burden associated with orthogonal frequency division multiplexing (OFDM) spectrum sensing. However, sampling below the Nyquist rate modifies
Farwa Ahmed, Pat Chambers, Mathini Sellathurai, Paul O'Leary, Darren F. Kavanagh   +4 more
doaj   +1 more source

A Sub-Nyquist Radar Electronic Surveillance System

IEEE Access, 2018
The modulated wideband converter (MWC) is well-known for a sub-Nyquist wideband sampling capability based on compressed sensing (CS) theory. In this paper, our goal is to use the MWC as a base to design a sub-Nyquist radar electronic surveillance (ES ...
Jeong Park, Jehyuk Jang, Sanghun Im, Heung-No Lee   +3 more
doaj   +1 more source

Ghost edge detection based on HED network

Frontiers of Optoelectronics, 2022
In this paper, we present an edge detection scheme based on ghost imaging (GI) with a holistically-nested neural network. The so-called holistically-nested edge detection (HED) network is adopted to combine the fully convolutional neural network (CNN ...
Shengmei Zhao, Yifang Cui, Xing He, Le Wang   +3 more
doaj   +1 more source

Roll‐to‐Roll Processable EC/TC Hybrid Smart Windows Driven by a Bidirectional Dual‐Chromic Polymer Electrolyte

Advanced Functional Materials, EarlyView.
We present a scalable EC/TC hybrid smart window using a DCPE that enables tunable solar modulation (ΔTsol:15–43%), fast electrochromic switching (<90 s), and strong thermal blocking (10–14°C reduction). HPMC improves thermal stability, while an optimized ISL enhances EC performance.
Soyeon Kim, Euiseok Jeong, Muhammad Jahandar, Huynh Tan Thanh Kha, Dong Chan Lim   +4 more
wiley   +1 more source