Extinction Ratio
Mostrando 1-12 de 37 artigos, teses e dissertações.
-
1. High-Speed Pulse Sequences through Semiconductor Optical Nonlinear Amplification and Buried Fiber Propagation
Abstract Microwave pulse bursts were obtained through optical domain intensity modulated microwave carriers, sliced by cascaded modulator technique, followed by non-linear semiconductor optical amplifier (SOA) pre-chirp. After 3 to 18 km of buried fiber propagation and photo detection, the microwave signals presented increased extinction ratio, up to 36 GHz,
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
-
2. Crescimento e partição de massa seca em plantas jovens de amburana (Amburana cearensis (Fr. All.) AC Smith) e de umbuzeiro (Spondias tuberosa Arr. Cam.)
Resumo As espécies amburana (Amburana cearensis (Fr. All.) A. C. Smith) e o umbuzeiro (Spondias tuberosa Arr. Cam.) possuem adaptações fisiológicas e morfológicas às condições climáticas do bioma caatinga e atualmente estão sob ameaça de extinção. Objetivou-se com a realização deste trabalho caracterizar a partição de fotoassimilados das mud
Ciênc. Florest.. Publicado em: 02/12/2019
-
3. Influence of temperature and time during malaxation on fatty acid profile and oxidation of centrifuged avocado oil
Abstract Virgin oil from avocados (Persea americana Mill.) is obtained by mechanical processes after pulp malaxation at temperatures that minimize oxidation and improve separation. The objective of this study was to assess the effect of time (0, 20, 30, 40, 60, 120 and 180 min) and temperature (40 and 50 °C) conditions during pulp malaxation on extraction y
Food Sci. Technol. Publicado em: 22/03/2018
-
4. Effect of pH on Optic and Structural Characterization of Chemical Deposited AgI Thin Films
AgI thin films were grown on amorphous commercial glass substrates with chemical bath deposition (CBD) at different pH values (2, 3, 4, 5, 6), 6 hours deposition time and 60 °C. The structure of the nanocrystals was characterized by X-ray diffraction (XRD). The ratio of Ag+ and I- ions changed the crystalline structures. The presence of the Ag+ ions produce
Mat. Res.. Publicado em: 31/08/2017
-
5. Ab. initio study of the structural, elastic, electronic and optical properties of Cu3N
Electronic, optical, elastic, properties of Copper nitride (Cu3N) in cubic anti- ReO3 phase have been studied using the full-potential augmented plane waves (FP-LAPW) within density functional theory (DFT) framework. Generalized gradient approximation (GGA), local density approximation (LDA), Perdew - Burke - Ernzerhof generalized parameterization of gradien
Mat. Res.. Publicado em: 01/04/2014
-
6. AnÃlise de performance de sÃlitons Ãpticos espaÃo-temporais em guia planar com nÃo-linearidade cÃbico quintica periodicamente modulada e circuitos lÃgicos operando nos regimes Kerr instantÃneo e relaxado. / Performance analysis of the spatio-temporal optical solitons in a planar guide with cubic quintic nonlinearity periodically modulated and logic circuits operating in regimes Kerr instantaneous and relaxed.
In this work, the propagation and stability of spatiotemporal optical solitons (or optical bullets) in a planar waveguide with periodically modulated cubic-quintic nonlinearity is presented numerically as a function of the amplitudes of modulation , the frequency of modulation and the propagation distance .With the objective of ensure the stability and preve
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2010
-
7. Calda sulfocálcica em pomares de citros: evolução da resistência em Brevipalpus phoenicis (Acari: Tenuipalpidae) e impacto sobre Iphiseiodes zuluagai (Acari: Phytoseiidae) / Lime sulfur in citrus groves: resistance evolution in Brevipalpus phoenicis (Acari: Tenuipalpidae) and impact on Iphiseiodes zuluagai (Acari: Phytoseiidae)
The use of the lime sulfur as an alternative product for controlling Brevipalpus phoenicis (Geijskes) has intensified in Brazilian citrus groves. The lime sulfur is the only efficient product used to control B. phoenicis and certified by organic producers with an average of 11 sprayings per year. Due to intense use of this product, the major objectives of th
Publicado em: 2010
-
8. CLASSIFICAÇÃO ESPECTRAL E DETERMINAÇÃO DE DISTÂNCIA DE ESTRELAS EM DEZ REGIÕES HII DO HEMISFÉRIO SUL
In order to determine distances of Southern Galactic HII regions, we carried out spectroscopic and photometric observations of the stellar content of a set of these objects. We have chosen objects only visible in the South hemisphere, with no published or uncertain distances. In this work, we present spectral classification based on intermediate dispersion s
Publicado em: 2009
-
9. Ecologia reprodutiva e análise de viabilidade de uma população do cágado Hydromedusa maximiliani (Testudines, Chelidae) no Parque Estadual Carlos Botelho / Reproduction ecology and population viability analysis of the neotropical freshwater turtle Hydromedusa maximiliani (Testudines, Chelidae) at the Parque Estadual Carlos Botelho, São Paulo, Brazil
The reproductive strategies of Hydromedusa maximiliani at the Carlos Botelho State Park, SP, was verified by X-ray in females and juveniles between September 2007 and December 2008. Throughout the study two reproductive seasons were detected, both beginning in September. From a total of 33 X-rayed females, only 19 showed eggs, and three of them showed eggs i
Publicado em: 2009
-
10. Organochlorines in Franciscana dolphins, Pontoporia blainvillei (MAMMALIA: CETACEA) from the coast off São Paulo State, Brazil / Organoclorados em Toninhas, Pontoporia blainvillei (MAMMALIA: CETACEA) da região costeira do Estado de São Paulo, Brasil
Organochlorines are one of the main pollutant groups that affect the ecosystems due to their environmental persistence and toxicity to the organisms. Franciscana dolphin, Pontoporia blainvillei, is a coastal cetacean, the only Brazilian dolphin considered threatened with extinction, due to the human activities. The aim of this work was evaluate the occurrenc
Publicado em: 2008
-
11. Acopladores direcionais de fibras Ãpticas com perfis de dispersÃo / Directional optic staple dispersion profile fiber(DPF)
We present a numerical investigation of the propagation and the switching of fundamental solitons in a two-core nonlinear fiber coupler constructed with Dispersion Profile Fiber (DPF). We have shown that appropriate shaping of the DPF profile is quite effective to recover, almost completely, the original switching behavior associated to the lossless situatio
Publicado em: 2007
-
12. Modificações induzidas por ions de alta energia em filmes finos de organosilicones sintetizados por PECVD / Modifications induced by high energy ions in organosilicones thin films syntesized by PECVD
Thin films of polysiloxanes, polysilazanes and polycarbosilanes, synthesized by Plasma Enhanced Chemical Vapor Deposition (PECVD), were irradiated with 170 keV He + , Ne + , Ar + and Kr + ions, at 170 keV at fluences of 1x10 14 , 5 x10 14 , 1x10 15 , 5x10 15 and 1 x10 16 ions/cm -2 . The irradiation promoted significant modifications in the atomic compositio
Publicado em: 2007