Magnetoresistance and transistor-like behavior of double quantum dots connected to ferromagnetic and superconductor leads

The electric current and the magnetoresistance effect are studied in a double quantum-dot system, where one of the dots QDa is coupled to two ferromagnetic electrodes (F1,F2), while the second QDb is connected to a superconductor S. For energy scales within the superconductor gap, electric conduction is allowed by Andreev reflection processes. Due to the presence of two ferromagnetic leads, non-local crossed Andreev reflections are possible. We found that the magnetoresistance sign can be changed by tuning the external potential applied to the ferromagnets. In addition, it is possible to control the current of the first ferromagnet (F1) through the potential applied to the second one (F2). We have also included intradot interaction and gate voltages at each quantum dot and analyzed their influence through a mean field approximation. The interaction reduces the current amplitudes with respect to the non-interacting case, but the switching effect still remains as a manifestation of quantum coherence, in scales of the order of the superconductor coherence length.Comment: Revised versio

Cross-cultural Adaptation of the Instrument Readiness for Hospital Discharge Scale - Adult Form

Objective: to perform the cross-cultural adaptation of the Readiness for Hospital Discharge Scale - (RHDS) Adult Form for use in Brazil. Method: a methodological study was conducted in 2015, in Brazil’s federal capital, following the eight stages scientifically established. Results: analysis proved the maintenance of semantic, idiomatic, cultural, and conceptual equivalences and kept both the face and content validity of the original version. The judging committee and the pre-test participants declared they understood the RHDS items and answer scale. Conclusion: the instrument is culturally adapted for Brazil and can be used as one of the stages for planning hospital discharge. Descriptors: Nursing Methodology Research; Transitional Care; Continuity of Patient Care; Patient-Centered Care; Patient Discharg

A changing role for universities in the periphery

An international research on interactions between universities and firms is an opportunity to investigate this subject beyond the developed countries. This project involves 12 countries from three continents: Africa (South Africa, Nigeria and Uganda), Asia (South Korea, China, India, Thailand and Malaysia) and Latin America (Mexico, Costa Rica, Argentina and Brazil). This paper introduces a theoretical framework to deal with this broad set of countries, their different levels of NSI formation and their different levels of development. This framework may help public policies to understand the role of universities for a country search for an “active insertion in the international division of labor”.interactions between firms and universities, National Innovation Systems, catch up processes.

Law of large numbers for the asymmetric simple exclusion process

We consider simple exclusion processes on Z for which the underlying random walk has a finite first moment and a non-zero mean and whose initial distributions are product measures with different densities to the left and to the right of the origin. We prove a strong law of large numbers for the number of particles present at time t in an interval growing linearly with t.Comment: 16 page

Introdução, coleta e conservação de germoplasma de coqueiro no Brasil.

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Spin-dependent beating patterns in thermoelectric properties: Filtering the carriers of the heat flux in a Kondo adatom system

We theoretically investigate the thermoelectric properties of a spin-polarized two-dimensional electron gas hosting a Kondo adatom hybridized with an STM tip. Such a setup is treated within the single-impurity Anderson model in combination with the atomic approach for the Green's functions. Due to the spin dependence of the Fermi wavenumbers the electrical and thermal conductances, together with thermopower and Lorenz number reveal beating patterns as function of the STM tip position in the Kondo regime. In particular, by tuning the lateral displacement of the tip with respect to the adatom vicinity, the temperature and the position of the adatom level, one can change the sign of the Seebeck coefficient through charge and spin. This opens a possibility of the microscopic control of the heat flux analogously to that established for the electrical current

Impact of Immigrant Entrepreneurs and Workers in Leisure and Hospitality Businesses: Massachusetts and New England

This report examines the role and impact of immigrant entrepreneurs and workers on Leisure and Hospitality businesses in New England, particularly Massachusetts. A significant portion of state economies in New England, especially in Massachusetts, relies heavily on the employment of the foreign-born. As the native workforce ages and population growth declines, businesses are becoming increasingly dependent upon the availability of the foreign-born. This development has facilitated an increasingly significant presence and role of immigrant entrepreneurs in Leisure and Hospitality businesses that is documented for the first time in this report