Results 51 to 60 of about 8,473 (273)

Janus‐Type Electrostatic Potential Gradient‐Activated Dynamic Zn2+‐Coordinating Nitrogen Sites in Molecularly Locked Nanocellulose Separators for Stable Zinc‐Ion Batteries

Advanced Science, EarlyView.
A multifunctional benzimidazole‐terminated CNF separator is constructed via a PEI‐mediated covalent locking strategy, generating dense zincophilic sites that accelerate Zn2+ transport and desolvation while enabling uniform Zn (002) deposition and suppressing side reactions.
Jie Liang, Shuxin Yang, Shuaiqi Zhao, Haitao Yang, Jingyuan Li, Jiaming Dong, Junwen Duan, Hao Yang, Yue Li, Yaxin Wang, Meilin Li, Ying Liu, Zhitao Shen, Rong Liu, Ruirui Cao, Fumin Li, Minshen Zhu, Yang Huang   +17 more
wiley   +1 more source

CO2‐to‐CO Electrolysis in Pure Water at Ampere‐Level Current Density and 1000 h Stability via a Rapid‐Transport Fixed‐Charge Interface

Advanced Science, EarlyView.
CO2 reduction in pure water is enabled by a rapid‐transport fixed‐charge interface that couples nanochannels with a cationic microenvironment. This design eliminates the mass transport plateau, stabilizes key reaction intermediates, and suppresses the hydrogen evolution reaction, ultimately achieving ampere‐level current densities and stable operation ...
Qiqi Wan, Gang Zhu, Wenxing Jiang, Yingying Liu, Jie Gui, Chi Xu, Ji Chen, Xiaodong Zhuang, Changchun Ke   +8 more
wiley   +1 more source

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

Ultra‐Wide‐Field Noninvasive Imaging Through Scattering Media Via Physics‐Guided Deep Learning

Advanced Science, EarlyView.
We propose a physics‐guided adaptive dual‐domain learning method for ultra‐wide‐field noninvasive imaging through scattering media, namely UNI‐Net. Our method not only reduces the requirement for real experimental data by an order of magnitude but also enables clear imaging of complex scenes with an ultra‐large field of view, which is 164 times the OME
Lintao Peng, Mingwei He, Jeff Zhu, Sujit K. Sahoo, Liheng Bian, Cuong Dang   +5 more
wiley   +1 more source

DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems

EURASIP Journal on Wireless Communications and Networking, 2009
A novel partial frequency response channel estimator is proposed for OFDMA systems. First, the partial frequency response is obtained by least square (LS) method.
Wang Yi, Li Lihua, Zhang Ping, Liu Zemin
doaj   +2 more sources

Dipole‐Manipulated Built‐In Electric Field Enables Ultrafast Charge Separation in Perylene Diimide Polymers for Photoelectrochemical Water Splitting

Advanced Science, EarlyView.
Molecular dipole engineering in dendritic perylene diimide polymers through nitrogen‐rich heterocyclic linkers amplifies the built‐in electric field, enabling sub‐picosecond charge separation and efficient multi‐electron accumulation. This structure–dynamics–performance relationship establishes a versatile design strategy for high‐performance organic ...
Ying‐Xin Qiao, Zicong Situ, Yi‐Jing Chen, Shuo‐Xiang Liu, Jing‐Lan Zhang, Xingqing Li, Luo‐Han Xie, Si‐Hang Xie, Qing‐Xiao Tong, Andong Xia, Zhuoran Kuang, Jing‐Xin Jian   +11 more
wiley   +1 more source

A 64-point Fourier transform chip for high-speed wireless LAN application using OFDM

, 2004
In this article, we present a novel fixed-point 16-bit word-width 64-point FFT/IFFT processor developed primarily for the application in the OFDM based IEEE 802.11a Wireless LAN (WLAN) baseband processor.
Jagdhold, U, Grass, E, Maharatna, K, Jagdhold, Ulrich, Maharatna, Koushik, Grass, Eckhard   +5 more
core   +1 more source

The New Formulas of Simultaneously Calculating DFT and IDFT of Real Sequences and Its Application in Digital Audio Watermarking

工程科学与技术, 2008
:In order to improve the efficient of digital audio watermarking embedding, by exploiting the new formulas of simultaneously calculating the discrete Fourier transform and inverse discrete Fourier transform of a N real sequence, an improved digital audio
范安东, 孙琦
doaj  

Task‐adaptive eigenvector‐based projection (EBP) transform for compressed sensing: A case study of spectroscopic profiling sensor

Analytical Science Advances, 2022
The compressed sensing (CS) theory requires the signal to be sparse under some transform. For most signals (e.g., speech and photos), the non‐adaptive transform bases, such as discrete cosine transform (DCT), discrete Fourier transform (DFT), and Walsh ...
Yinsheng Zhang, Haiyan Wang, Yongbo Cheng, Xiaolin Qin   +3 more
doaj   +1 more source

Multiplicative complexity of the two-dimensional discrete Fourier transform DFT (2 ⁿ ; 2)

Electronics Letters, 1988
The authors extend known results of multiplicative complexity from Winograd, Auslander, Heideman, etc. to the two-dimensional discrete Fourier transform \(DFT(2^ n,2)\). They show that the \(DFT(2^ n,2)\) can be transformed into a series of distinct second versions of the discrete cosine transform (DCT).
Ma, W., Yang, D.
openaire   +1 more source