Results 121 to 130 of about 4,596,905 (360)

The reciprocal of a Fourier series [PDF]

Proceedings of the American Mathematical Society, 1962
Edrei and Szego5 [1] have posed the following problem: Giiven the Foiurier coefficients of a function G(x) find the Fourier coe/ftcients of the reciprocal of the function without actually evaluating G(x). They were able to solve this problem in the case that G(x) ?0.
openaire   +2 more sources

Ionic Metal Poly(heptazine Imides) and Single‐Atoms Interplay: Engineered Stability and Performance for Photocatalysis, Photoelectrocatalysis and Organic Synthesis

Advanced Functional Materials, EarlyView.
Poly(heptazine) imides (PHIs), a crystalline carbon nitride subclass, intercalate metals to deliver high stability, tunable electronics, and efficient charge separation. These features enable solar‐driven applications such as hydrogen evolution, CO₂ reduction, and organic synthesis.
Gabriel A. A. Diab, Izadora F. Reis, Chong Wang, Diandra Barreto, Oleksandr Savateev, Ivo F. Teixeira, Pablo Jiménez‐Calvo   +6 more
wiley   +1 more source

Fourier-Stieltjes series of Walsh functions [PDF]

, 1957
N. J. Fine
openalex   +1 more source

Cu‐Based MOF/TiO2 Composite Nanomaterials for Photocatalytic Hydrogen Generation and the Role of Copper

Advanced Functional Materials, EarlyView.
HKUST‐1/TiO2 composite materials show a very high photocatalytic hydrogen evolution rate which increases as a function of the irradiation time until reaching a plateau and even surpasses the performance of the 1%Pt/TiO2 material after three photocatalytic cycles.
Alisha Khan, Marie Le Pivert, Alireza Ranjbari, Diana Dragoe, Daniel Bahena‐Uribe, Christophe Colbeau‐Justin, Christian Herrero, Dorota Rutkowska‐Zbik, Johnny Deschamps, Hynd Remita   +9 more
wiley   +1 more source

A Fourier Fitting Method for Floating Vehicle Trajectory Lines

ISPRS International Journal of Geo-Information
With the advancement of spatial positioning technology, trajectory data have been growing rapidly. Trajectory data record the spatiotemporal information and behavioral characteristics of moving objects, and in-depth analysis can provide decision support ...
Yun Shuai, Pengcheng Liu, Hao Han
doaj   +1 more source

Micro-Doppler feature extraction under passive radar based on orthogonal frequency division multiplexing communication signal

The Journal of Engineering, 2019
Micro-Doppler (m-D) effect is a unique signature of radar targets with micro-motion, which provides a new technique for target recognition. Passive radar based on communication signal has a great significance in detection and recognition for micro-motion
Xiao-yu Qu, Kai-ming Li, Qun Zhang, Bi-Shuai Liang   +3 more
doaj   +1 more source

Use of Fourier Series in X-ray Diffraction (XRD) Analysis and Fourier-Transform Infrared Spectroscopy (FTIR) for Estimation of Crystallinity in Cellulose from Different Sources. [PDF]

Polymers (Basel), 2022
Montoya-Escobar N, Ospina-Acero D, Velásquez-Cock JA, Gómez-Hoyos C, Serpa Guerra A, Gañan Rojo PF, Vélez Acosta LM, Escobar JP, Correa-Hincapié N, Triana-Chávez O, Zuluaga Gallego R, Stefani PM.   +11 more
europepmc   +1 more source

FOURIER SERIES. VII. UNIFORM CONVERGENCE FACTORS OF FOURIER SERIES [PDF]

, 1957
Miyoko Katayama
openalex   +1 more source

Mg2+/Al3+ Co‐doped Li‐Rich Manganese‐Based Oxides for Boosting Rate Performance and Stability of Lithium‐Ion Batteries

Advanced Functional Materials, EarlyView.
The co‐doping strategy can effectively address the challenges associated with LRMOs cathode materials, providing a promising pathway for the development of high energy density and resilient cathode materials in the next‐generation lithium‐ion batteries. Abstract Lithium‐rich manganese‐based oxides (LRMOs) are promising cathode materials for lithium‐ion
Junxia Meng, Wenzhuan Hu, Quanxin Ma, Zhenzhen Wu, Lishuang Xu, Jie Huang, Chen Xiao, Junru Wang, Lina Zhang, Feng Liu, Xing Zhi, Shanqing Zhang   +11 more
wiley   +1 more source

Oscilador harmônico: Uma análise via séries de Fourier

Revista Brasileira de Ensino de Física
O método de séries de Fourier é usado para resolver a equação homogênea que governa o movimento do oscilador harmônico. Mostra-se que a solução geral do problema pode ser encontrada com surpreendente simplicidade para o caso do oscilador harmônico ...
A. S. de Castro
doaj   +1 more source