Spin-polarized transport in ferromagnetic multilayered semiconductor nanostructures

The occurrence of inhomogeneous spin-density distribution in multilayered ferromagnetic diluted magnetic semiconductor nanostructures leads to strong dependence of the spin-polarized transport properties on these systems. The spin-dependent mobility, conductivity and resistivity in (Ga,Mn)As/GaAs,(Ga,Mn)N/GaN, and (Si,Mn)/Si multilayers are calculated as a function of temperature, scaled by the average magnetization of the diluted magnetic semiconductor layers. An increase of the resistivity near the transition temperature is obtained. We observed that the spin-polarized transport properties changes strongly among the three materials.Comment: 3 pages, 4 figure

Wine prestige and experience in enhancing relationship quality and outcomes: wine tourism in Douro

Purpose: The purpose of this study is twofold: conduct a systematic literature review on relationship quality; and analyse the effect of wine brand prestige and wine consumer experience on consumer satisfaction, as well as the wine brand image and word of mouth as outcomes. Design/methodology/approach: The authors employed a systematic approach to develop the literature review and a survey was designed and used to collect responses from 479 wine consumers and tourists. Partial Least Squares approach was used to test the proposed model and analyse the findings. Findings: The systematic approach allows to determine the core constructs of relationship quality, main antecedents and outcomes, which help in the conceptualisation of the proposed model. The findings of the survey suggest that wine brand prestige is more effective in enhancing consumer satisfaction than wine consumer experience. Consumer satisfaction acts as a mediator between wine brand prestige and wine consumer experience and the outcomes, that is, wine. Originality/value: This research sheds light on a strategic and communicational development of prestigious wine brands to enhance wine image and keep wine tourists captivated.info:eu-repo/semantics/acceptedVersio

Electron transfer driven decomposition of adenine and selected analogs as probed by experimental and theoretical methods

We report on a combined experimental and theoretical study of electron transfer induced decomposition of adenine and a selection of analogue molecules in collisions with potassium atoms (K). Time-of-flight negative ion mass spectra have been obtained in a wide collision energy range (6–68 eV in the centre-of-mass frame), providing a comprehensive investigation of the fragmentation patterns of purine, adenine, 9-methyl adenine, 6-dimethyl adenine and 2-D adenine. Following our recent communication about selective hydrogen loss from the transient negative ions (TNI) produced in these collisions [T. Dunha et al. J. Chem. Phys. 148, 021101 (2018)], this work focuses on the production of smaller fragment anions. In the low-energy part of the present range, several dissociation channels that are accessible in free electron attachment experiments are absent from the present mass spectra, notably NH2 loss from adenine and 9-methyl adenine. This can be understood in terms of a relatively long transit time of the K+ cation in the vicinity of the TNI tending to enhance the likelihood of intramolecular electron transfer. In this case, the excess energy can be redistributed through the available degrees of freedom inhibiting fragmentation pathways. Ab initio theoretical calculations were performed for 9-methyl adenine (9-mAd) and adenine (Ad) in the presence of a potassium atom and provided a strong basis for the assignment the lowest unoccupied molecular orbitals accessed in the collision process

Nitrogênio e herbicidas no feijoeiro irrigado cultivado sobre palhadas de Brachiaria decumbens.

Este trabalho teve por objetivo avaliar o efeito de palhadas de Brachiaria decumbens na resposta do feijoeiro à aplicação de doses de N em cobertura, com e sem aplicação de herbicidas para o manejo químico de plantas daninhas em pós-emergência.CONAFE

Épocas de aplicação e fontes nitrogenadas no desenvolvimento do feijoeiro.

O objetivo deste trabalho foi avaliar o efeito da época de aplicação e de fontes nitrogenadas em cobertura no crescimento do feijoeiro cultivado em sistema plantio direto.CONAFE

Métodos de manejo da irrigação no feijoeiro.

Diante da importância de estudos capazes de gerar informações sobre as necessidades hídricas e manejo da irrigação, desenvolveu-se este trabalho com o objetivo de quantificar o desempenho de três formas de manejo da irrigação, tensiometria, tanque Classe A e Penman-Monteith, no feijoeiro, cultivado sob plantio direto no Cerrado.bitstream/item/108994/1/Cot220.pd

Efeito do regulador vegetal cloreto de clormequat nos componentes da produção e na produtividade do feijoeiro.

O objetivo deste trabalho foi avaliar os efeitos de doses do regulador de crescimento cloreto de clormequat, marca comercial Tuval®, aplicado de forma parcelada, em algumas características agronômicas e na produtividade do feijoeiro

Doses e formas de aplicação de uréia comum e aditivada no feijoeiro irrigado cultivado em plantio direto.

O objetivo deste trabalho foi avaliar a resposta do feijoeiro irrigado por aspersão, sistema pivô central, cultivado em condições de plantio direto no sistema integração lavourapecuária, à adubação com duas fontes de N, uréia normal e uréia aditivada, duas formas de aplicação, em superfície e incorporada, e quatro doses de N em cobertura, em Latossolo Vermelho distroférrico