Results 61 to 70 of about 51,423 (250)

LFA: A Lattice Fourier Analyzer for Quantitative In Situ EC‐STM of Adsorbate–Substrate Superstructures

Advanced Materials Interfaces, EarlyView.
Although electrochemical scanning tunneling microscopy provides atomic‐scale access to electrified interfaces, quantitative in situ and operando investigations suffer from drift‐induced distortions. This work introduces the Lattice Fourier Analyzer (LFA), which employs substrate‐anchored affine drift correction in reciprocal space to recover precise ...
Rafał Lewandków, Paulina Wira, Anna Futyma, Radosław Wasielewski, Tomasz Kosmala   +4 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

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

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

Metal‐Metal‐π Interaction: A Pathway to Construct Organic–Inorganic Excited‐State and Supramolecular Assembly

Advanced Optical Materials, EarlyView.
An organic–inorganic mixed excited state is designed and demonstrated by combining the metal–metal and π–π interactions within a supramolecular Pt2–pyrene assembly. Directional orbital overlap between the Pt and carbon atoms gives rise to a long‐lived triplet emission, strong emission polarization, exciton–exciton annihilation, and efficient exciton ...
Ying Luo, Yangbo Zhang, Ning Zhou, Xiong Wang, Ying‐Fan Tan, Wenjie Zou, Wei Lu, Qingyun Wan   +7 more
wiley   +1 more source

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

New fast algorithm for two-dimensional discrete Fourier transform DFT(2 ⁿ ; 2)

Electronics Letters, 1989
Two-dimensional fast discrete Fourier transform is computed by means of fast discrete cosine transform. This algorithm permits the transformation with a fewer multiplications and additions, when compared with the usual.
Ma, Weizhen, Yang, Dekun
openaire   +1 more source

Temporal and Cell‐Specific Regulation of Synaptic Homeostasis by the Chromatin Remodeler Chd1

Advanced Science, EarlyView.
Chd1, the Drosophila homologue of mammalian CHD2 ‐ a gene linked to autism, epilepsy, and intellectual disability, is required for synaptic homeostatic plasticity. Chd1 in glia is necessary for the rapid induction of synaptic homeostasis, whereas Chd1 in motoneurons, muscle, and glia is critical for long‐term maintenance.
Danielle T. Morency, Tao Cui, Yimei Cai, Chloe Lok, Rachel E. Nokku, Ruoxian Huang, Grace L. Chu, Yumeng Xie, Saleem W. Abu‐Tayeh, Kaikai He, Chengjie Qiu, Junyi Wang, Paxton M. Paganelli, Ting Wang, Gabrielle Williams, Sreejith Nair, Huadong Pei, Dion K. Dickman, Stefano Vicini, Tingting Wang   +19 more
wiley   +1 more source

KLASIFIKASI DAN PENINGKATAN KUALITAS CITRA SIDIK JARI MENGGUNAKAN DFT (DISCRETE FOURIER TRANSFORM)

Jurnal Infomedia, 2016
Sidik jari merupakan suatu komponen biometrik yang sering digunakan sebagai alat identifikasi yang terbukti cukup efektif karena sifatnya yang universal, unik, dan permanen pada setiap manusia. Berdasarkan jenis nya sidik jari memiliki 4 jenis yaitu berminyak, normal, kering, dan kotor.Sidik jari kering yang secara kasat mata dapat dilihat adanya garis
Cilla Sundari, Muhammad Nasir, Hari Toha Hidayat   +2 more
openaire   +1 more source

Engineering MnPt Bimetallic Nanozymes for Cascade Enzymatic Therapy and Enhanced Radio‐Immunotherapy

Advanced Science, EarlyView.
A CD44‐targeted MnPt bimetallic nanozyme (HD@MnO2) integrates multienzyme‐like activity with cGAS–STING activation to boost radio‐immunotherapy. Through cascade biocatalysis, it depletes glutathione, relieves hypoxia, and amplifies ROS, enhancing radiotherapy‐induced DNA damage and immunogenic cell death. The nanozyme promotes dendritic cell maturation
Wenyi Zhang, Yangyang Guo, Guoping Xu, Luhaoxiang Liu, Lin Chen, Cai Zhang, Yiming Li, Jianmin Li, Yang Zhao   +8 more
wiley   +1 more source