343 research outputs found
High frequency magnetic behavior through the magnetoimpedance effect in CoFeB/(Ta, Ag, Cu) multilayered ferromagnetic thin films
We studied the dynamics of magnetization through an investigation of the
magnetoimpedance effect in CoFeB/(Ta, Ag, Cu) multilayered thin films grown by
magnetron sputtering. Impedance measurements were analyzed in terms of the
mechanisms responsible for their variations at different frequency intervals
and the magnetic and structural properties of the multilayers. Analysis of the
mechanisms responsible for magnetoimpedance according to frequency and external
magnetic field showed that for the CoFeB/Cu multilayer, ferromagnetic resonance
(FMR) contributes significantly to the magnetoimpedance effect at frequencies
close to 470 MHz. This frequency is low when compared to the results obtained
for CoFeB/Ta and CoFeB/Ag multilayers and is a result of the anisotropy
distribution and non-formation of regular bilayers in this sample. The MImax
values occurred at different frequencies according to the used non-magnetic
metal. Variations between 25% and 30% were seen for a localized frequency band,
as in the case of CoFeB/Ta and CoFeB/Ag, as well as for a wide frequency range,
in the case of CoFeB/Cu.Comment: 14 pages, 5 figure
Efeitos da irrigação e de nĂveis de nitrogĂȘnio em aspectos qualitativos e nutricionais da figueira (Ficus carica L.)
In order to evaluate qualitative and nutritional aspects of fig-trees with respect to six irrigation and six nitrogen levels, at Ilha Solteira, SP, Brazil, an experiment was carried out in randomized blocks, with subdivided plots, and four replications. Results showed that in four dates during harvest, only the first analysis (January 2, 1991) showed influence of nitrogen fertilization on fruit soluble solids (brix). There was no significant effect of treatments on pulp/peel relation for the four harvestings. In relation to leaf macronutrient concentration at flowering, water supply influenced N, P and Ca concentrations, and nitrogen influenced only Ca concentration. For an average of 10 t.ha-1 of mature fruit and 1.3 t.ha-1 of immature fruit production, there was a nutrient export of about 65 kg.ha-1 of N; 10 kg.ha-1 of P2O5; 44 kg.ha-1 of K2O; 35 kg.ha-1 of Ca and 9 kg.ha-1 of Mg.Para avaliar aspectos qualitativos e nutricionais da figueira em relação a seis nĂveis de irrigação e de nitrogĂȘnio, desenvolveu-se um experimento em blocos ao acaso, com parcelas subdivididas e com quatro repetiçÔes, em Ilha Solteira,SP. Os resultados mostraram que em quatro datas de colheita, apenas a primeira anĂĄlise (2 de janeiro de 91) mostrou influĂȘncia da fertilização nitrogenada sobre os sĂłlidos solĂșveis (brix) dos frutos. NĂŁo houve efeito significativo dos tratamentos sobre a relação polpa/casca, nas quatro colheitas. Com relação Ă concentração de macronutrientes nas folhas na Ă©poca de florescimento, o suprimento de ĂĄgua influenciou as concentraçÔes de N, P e Ca e a aplicação de nitrogĂȘnio influenciou apenas a concentração de Ca. Para uma produção mĂ©dia de 10 t.ha-1 de frutos maduros e de 1,3 t.ha-1 de frutos verdes, observou-se uma exportação de aproximadamente 65 kg.ha-1 de N; 10 kg.ha-1 de P2O5 ; 44 kg.ha-1 de K2O; 35 kg.ha-1 de Ca e 9 kg.ha-1 de Mg
Visados y certificaciones académicas: refugiados sirios en Brasil
El programa de visado humanitario de Brasil para refugiados sirios y sus esfuerzos por reconocer sus certificaciones acadĂ©micas podrĂan ofrecer lecciones para la protecciĂłn de los refugiados y su integraciĂłn en toda la regiĂłn
CaracterĂsticas de carcaça de codornas de corte EV1 alimentadas com diferentes nĂveis de metionina+cistina total
Preservatives and neutralizing substances in milk: analytical sensitivity of official specific and nonspecific tests, microbial inhibition effect, and residue persistence in milk
Aplicação superficial de calcĂĄrio e diferentes resĂduos em soja cultivada no sistema plantio direto
ExigĂȘncia de energia metabolizĂĄvel de codornas de corte no perĂodo de 1 a 14 dias de idade
A apropriação social da Internet pelo bibliotecårio catarinense: o retrato de uma década
Fusarium wilt incidence and common bean yield according to the preceding crop and the soil tillage system
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