Tunable asymmetric magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films

We investigate the magnetization dynamics through the magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films. We observe that the magnetoimpedance response is dependent on the thickness of the non-magnetic Cu spacer material, a fact associated to the kind of the magnetic interaction between the ferromagnetic layers. Thus, we present an experimental study on asymmetric magnetoimpedance in ferromagnetic films with biphase magnetic behavior and explore the possibility of tuning the linear region of the magnetoimpedance curves around zero magnetic field by varying the thickness of the non-magnetic spacer material, and probe current frequency. We discuss the experimental magnetoimpedance results in terms of the different mechanisms governing the magnetization dynamics at distinct frequency ranges, quasi-static magnetic properties, thickness of the non-magnetic spacer material, and the kind of the magnetic interaction between the ferromagnetic layers. The results place ferromagnetic films with biphase magnetic behavior exhibiting asymmetric magnetoimpedance effect as a very attractive candidate for application as probe element in the development of auto-biased linear magnetic field sensors.Comment: 5 figure

Desempenho de borregas da raça Santa Inês alimentadas com cana-de-açúcar e ramas de amoreira.

O desempenho de borregas alimentadas com dietas compostas de concentrado (20%) e volumoso (80%)a base de cana-de-açúcar( Saccharumo fficinarum cv RB 72-454)e ramas de amoreira (Morus spp.) foi avaliado. Os tratamentos foram: A- 80% de cana-de-açúcari B- 60% de cana-de-açúcaer 20%d e ramasd e amoreira e C- 40%d e cana-de-açúcaer 40%d e ramas de amoreira. O delineamento estatístico foi em blocos casualizados sendo os dados submetidos à análise de regressão. Foram utilizadas 24 fêmeas da raça Santa Inês, com iilade aproximada de cinco meses e peso vivo inicial de 18,3 J: 2,7kg. Avaliou-se o consumo voluntário de matéria seca, o ganho de peso vivo diário e total e a conversão alimentar. Constatou-se efeito linear significativo (P<0,05) para o consumo de matéria seca com o aumento do porcentual de ramas de amoreira na dieta, com conseqüentea umento linear (P<0,05)n o ganho de peso vivo total e diário. Houve redução linear (P<0,05) na conversão alimentar em função do aumento dos níveis de ramas de amoreira. Observaram-se valores mais elevados de fibra em detergente neutro, fibra em detergente ácido, ligninae menor valor de digestibilidade in vitro na cana-de-açúcaer em relação às ramas de amoreira. A cana-de-açúcar como volumoso exclusivo não possibilita desempenho a dequado de borregas, sendo que a associação com ramas de amoreira melhora o desempenho animal

Soybean development under soil water deficit.

One of the main factors affecting soybean development is water deficiency, especially when it occurs during the flowering and pods filling stages. Thus, this study aimed to evaluate the soybean development under soil water deficit in different phenological phases, under soil and climatic conditions of Bom Jesus, Piaui State, Brazil. The test was conducted at São Luiz Farm, located 3 km from Bom Jesus to PI, during the period from August to December, 2014. The test was conducted with a drip irrigation system using drip tape with 0.3 m between emitters and nominal flow of 1.6 L h to 1. The water deficit was applied in the vegetative development stages (treatment I), flowering and grains filling (treatment II) and grain maturation (treatment III), compared to the control treatment (full irrigation throughout the cycle). Plant height, number of green leaves, leaf area index and plant dry matter were evaluated. The water deficit in the flowering and pod filling stages inhibited the BRS Sambaíba RR cultivar growth, contributing to a reduction of up to 33.2, 34.7, 41.3 and 13.7% of plant height, number of leaves, leaf area index and total dry mass, respectively compared to the control

Utilizando filtragem de Kalman e redes neurais em uma estimação conjunta para melhoria de qualidade da análise de parâmetros físicos do solo com Tomografia Computadorizada de Raios X.

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