Results 71 to 80 of about 51,308 (258)

Análisis espectral de las Medias Mensuales del Campo Geomagnético en el Observatorio de Huancayo (desde 1922 hasta 1990)

open access: yesRevista de Investigación de Física, 1999
El análisis espectral ha sido aplicado a las series de tiempo de los valores medios mensuales de las componentes D, H y Z del campo geomagnético resgistrado en el Observatorio Magnético de Huancayo (OMH).
Joel Rojas Acuña   +1 more
doaj   +1 more source

Decoupling Light Absorption From Photocatalytic Reactivity in TiO2 via Defect and Interfacial Engineering

open access: yesAdvanced Functional Materials, EarlyView.
A hybrid photoprotective material integrates N‐doped TiO2 with a metal‐phenolic network (MPN) to achieve broad‐spectrum attenuation and robust reactive oxygen species (ROS) suppression. Nitrogen doping extends attenuation into the UVA/high energy visible light (HEV) regions and facilitates fast charge recombination to inhibit ROS formation.
Saehan Choi   +9 more
wiley   +1 more source

Séries de Fourier e Métodos de Fourier espectrais [PDF]

open access: yes, 2004
TCC (graduação) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Curso de Matemática.No primeiro capítulo, apresentamos algumas definições e espaços que serão muito utilizados ao longo deste trabalho.
Travessini, Fabiana
core  

Identification of mechanical systems using the Fourier Series method - a time domain method [PDF]

open access: yes, 1992
In this chapter, the Fourier series method for the identification of mechanical systems is presented. The method will initially be developed for systems with only one degree of freedom, and will later be extended to systems with various degrees of ...
Melo, Gilberto Pechoto de
core   +1 more source

Análisis de Fourier y Wavelet de las series de tiempo de la estación meteorológica ESPOL-FIMCBOR

open access: yesRevista Tecnológica, 2015
Mediciones históricas de temperatura del aire, presión atmosférica y velocidad del viento de la estación meteorológica de la ESPOL, correspondiente al periodo 2000-2001 se han analizado mediante la transformación wavelet, la cual permite establecer si ...
Isaac Mancero-Mosquera   +1 more
doaj   +2 more sources

From Photoalignment to Structured Light: Liquid Crystal Platforms for Beam Shaping and Complex Wavefronts

open access: yesAdvanced Functional Materials, EarlyView.
Photoaligned and photopatterned liquid crystal platforms provide programmable control of optical phase, polarization, and spin‐orbit interactions, enabling compact generation of structured light and complex wavefronts. This review highlights how tailored molecular orientations transform simple beams into designed optical fields, opening versatile ...
Le Zhou   +6 more
wiley   +1 more source

Aplicação de Séries de Fourier para análise de retornos de ativos financeiros [PDF]

open access: yes, 2006
As Séries de Fourier permitiram o advento de tecnologias aplicadas em diversas áreas do conhecimento ao proporcionar uma melhor compreensão do comportamento de séries de dados, decompondo-as em diversas harmônicas independentes.
Bianchi Filho, Valter   +1 more
core  

Convergência de uma Série de Fourier [PDF]

open access: yes, 2016
Faz-se necessário noções de séries de Fourier e convergências de sériesNeste recurso é visualizado o gráfico das n somas parciais da série de Fourier e é demostrado a convergência dessa sérieComponente Curricular::Educação Superior::Ciências Exatas e ...
Andrade, Lenimar Nunes de
core   +2 more sources

Three‐Dimensional Biomimetic Aerogel Conduits with Electro‐Ionic‐Immune Coupling Reverse the Pathological Cascade of Spinal Cord Injury

open access: yesAdvanced Functional Materials, EarlyView.
A biomimetic aerogel conduit was engineered from a nanofiber of gelatin/poly(l‐lactic acid) doped with polypyrrole nanoparticles, integrated with tannic acid and Mg2+. This “electro‐ionic‐immune” strategy mimicked spinal cord properties, reduced calcium overload, inflammation, oxidative damage, promoted neural stem cell differentiation, suppressed ...
Qingxiang Liu   +9 more
wiley   +1 more source

Análisis de cadenas de Markov y series de Fourier en una secuencia hemipelágica del Jurásico Superior de la Península Antártica

open access: yesLatin American Journal of Sedimentology and Basin Analysis, 2021
La Formación Ameghino (Kimmeridgiano-Berriasiano), Cuenca Larsen, Península Antártica, está compuesta por una asociación de microfacies de pelitas con radiolarios (P1), pelitas negras (P2), pelitas bioturbadas y peloidales (P3), tobas (T) y areniscas (A)
Diego A. Kietzmann   +3 more
doaj   +2 more sources

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