Theoretical and experimental study of the excitonic binding energy in GaAs/AlGaAs single and coupled double quantum wells

This paper discusses the theoretical and experimental results obtained for the excitonic binding energy (Eb) in a set of single and coupled double quantum wells (SQWs and CDQWs) of GaAs/AlGaAs with different Al concentrations (Al%) and inter-well barrier thicknesses. To obtain the theoretical Eb the method proposed by Mathieu, Lefebvre and Christol (MLC) was used, which is based on the idea of fractional-dimension space, together with the approach proposed by Zhao et al., which extends the MLC method for application in CDQWs. Through magnetophotoluminescence (MPL) measurements performed at 4 K with magnetic fields ranging from 0 T to 12 T, the diamagnetic shift curves were plotted and adjusted using two expressions: one appropriate to fit the curve in the range of low intensity fields and another for the range of high intensity fields, providing the experimental Eb values. The effects of increasing the Al% and the inter-well barrier thickness on E b are discussed. The Eb reduction when going from the SQW to the CDQW with 5 Å inter-well barrier is clearly observed experimentally for 35% Al concentration and this trend can be noticed even for concentrations as low as 25% and 15%, although the Eb variations in these latter cases are within the error bars. As the Zhao's approach is unable to describe this effect, the wave functions and the probability densities for electrons and holes were calculated, allowing us to explain this effect as being due to a decrease in the spatial superposition of the wave functions caused by the thin inter-well barrier. © 2013 Elsevier B.V.

Validation of the brazilian version of the apathy inventory

Background Apathy is a frequent neuropsychiatric condition in neurodegenerative disorders, depression, and often in mild cognitive impairment. The Apathy Inventory (AI) is a reliable instrument for improving the accuracy of the apathy diagnosis. The aim was to establish the validity of the Apathy Inventory for the Brazilian community. Methods We established the concurrent validity, internal consistency, inter-rater reliability, and the sensitivity and specificity of AI for the Brazilian community in a cohort of 175 individuals with Alzheimer's disease, Parkinson's disease, depression, mild cognitive impairment, and healthy controls. The three dimensions of the AI (emotional blunting, lack of initiative, and lack of interest) were compared with the Apathy domain of the Neuropsychiatric Inventory-Clinician rating scale (NPI-C) in an independent scheme. Results The analyses demonstrated high correlation coefficients in AI's individual dimensions and in AI-total score (F = 0.965). Concerning the NPI-C/Apathy domain, intra-class correlation coefficients were also high (F = 0.977). Concurrent validity was high according to both raters on AI dimensions × NPI-C/Apathy domain and regarding total score (rater 1: rho = 0.956 vs. rater 2: rho = 0.970). The internal consistency of the AI was also high concerning the AI's individual dimensions and total score (rater 1: 0.945 vs. rater 2: 0.958). Conclusion We observed high internal consistency, high concurrent validity, and inter-rater reliability of the Apathy Inventory. In addition, we found that its sensitivity and specificity were high. We suggest that the Brazilian version of the Apathy Inventory would be an appropriate instrument to identify the apathy syndrome in Brazilian patients. © 2012 John Wiley & Sons, Ltd.

The Brazilian version of the Neuropsychiatric Inventory-Clinician rating scale (NPI-C): Reliability and validity in dementia

ABSTRACT Background: Patients with dementia may be unable to describe their symptoms, and caregivers frequently suffer emotional burden that can interfere with judgment of the patient's behavior. The Neuropsychiatric Inventory-Clinician rating scale (NPI-C) was therefore developed as a comprehensive and versatile instrument to assess and accurately measure neuropsychiatric symptoms (NPS) in dementia, thereby using information from caregiver and patient interviews, and any other relevant available data. The present study is a follow-up to the original, cross-national NPI-C validation, evaluating the reliability and concurrent validity of the NPI-C in quantifying psychopathological symptoms in dementia in a large Brazilian cohort. Methods: Two blinded raters evaluated 312 participants (156 patient-knowledgeable informant dyads) using the NPI-C for a total of 624 observations in five Brazilian centers. Inter-rater reliability was determined through intraclass correlation coefficients for the NPI-C domains and the traditional NPI. Convergent validity included correlations of specific domains of the NPI-C with the Brief Psychiatric Rating Scale (BPRS), the Cohen-Mansfield Agitation Index (CMAI), the Cornell Scale for Depression in Dementia (CSDD), and the Apathy Inventory (AI). Results: Inter-rater reliability was strong for all NPI-C domains. There were high correlations between NPI-C/delusions and BPRS, NPI-C/apathy-indifference with the AI, NPI-C/depression-dysphoria with the CSDD, NPI-C/agitation with the CMAI, and NPI-C/aggression with the CMAI. There was moderate correlation between the NPI-C/aberrant vocalizations and CMAI and the NPI-C/hallucinations with the BPRS. Conclusion: The NPI-C is a comprehensive tool that provides accurate measurement of NPS in dementia with high concurrent validity and inter-rater reliability in the Brazilian setting. In addition to universal assessment, the NPI-C can be completed by individual domains. © International Psychogeriatric Association 2013.

An HPLC-UV method for the quantification of zidovudine in rat plasma

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Um estudo dos efeitos da atuação de um SVC sobre as interações entre máquinas de um sistema de potência multimáquinas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo por dinâmica molecular da estabilidade conformacional de dímeros do peptídeo Eumenine mastoparan-AF em água e mistura TFE-água

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação, sistema de ciclos e regime de progressão continuada: progressão das aprendizagens do aluno ou progressão de fluxo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Report on the production of trade statistics in the Caribbean region

Includes bibliography

Conditional cash transfer programmes: the recent experience in Latin America and the Caribbean

Includes Bibliography

Access of Latin American and Caribbean exports to the US market 2004-2005

Includes bibliography

Filogeografia de duas espécies de Rhodophyta da ordem Batrachospermales no Brasil

Pós-graduação em Microbiologia - IBILCE

The Role of Technical Assistance in World Trade Organization (WTO) Trade Facilitation Negotiations

This issue of the Bulletin presents a brief review of trade facilitation negotiations from the specific viewpoint of technical assistance, capacity-building and special and differential treatment (SDT). Trade facilitation negotiations have focused on clarifying three articles of the General Agreement on Tariffs and Trade (GATT): article V (freedom of transit); article VIII (fees and formalities connected with importation and exportation); and article X (publication and administration of trade regulations). Although the stage of text-based negotiations has not yet been reached, the process of receiving and analysing proposals has made it possible to identify the aspects most urgently in need of correcting by means of trade facilitation measures. Consideration has been given to several formulas for the implementation of those measures and to how the associated technical assistance should be organized.

Technical Notes on Trade Facilitation Measures

Towards the end of 2004, the members of the World Trade Organization (WTO) formally launched negotiations on trade facilitation on the basis of the modalities set out in Annex D of the July Package adopted in 2004. This mandate instructed members to clarify and improve three articles of the General Agreement on Tariffs and Trade (GATT), namely, article V on freedom of transit, article VIII on fees and formalities connected with importation and exportation, and article X on the publication and administration of trade regulations. To support these negotiations, the United Nations Conference on Trade and Development (UNCTAD) created a trust fund, with contributions from the Governments of Sweden and Spain . This fund has been used to develop a series of seminars and meetings and to produce a total of 20 technical notes on specific trade facilitation measures. These notes cover in particular facilitation measures that are topics of specific proposals that were made during WTO negotiations. This edition of the FAL Bulletin summarizes several of these technical notes, focusing mainly on customs-related issues.

Institutionality, logistics and international cooperation for the economic and social development: The case of the Plurinational State of Bolivia

Includes bibliography.

Informe nacional de monitoreo de la eficiencia energética de la República Argentina, 2014

Para los países de América Latina y el Caribe, el desarrollo económico con mayores niveles de eficiencia energética resulta ser un importante paso hacia el sendero de la sostenibilidad. Asumiendo una perspectiva de mediano plazo, entre los principales factores que movilizan la promoción de la eficiencia energética cabe considerar a la seguridad en el suministro de la energía, la mayor eficiencia en el gasto y el alto potencial de producir ahorros energéticos, las preocupaciones por mitigar los impactos ambientales fruto de las emisiones de gases de efecto invernadero (GEI), lo que obviamente incluye al fenómeno del cambio climático y, en los países en desarrollo, las limitaciones que pudieran generarse en relación a la inversión orientada expandir la oferta energética de los mismos. En los países de América Latina y el Caribe, la calidad de las estadísticas e indicadores de desempeño que permiten cuantificar los resultados de los programas nacionales de eficiencia energética ha sido insuficiente. Para superar esta carencia, la CEPAL ha articulado el Programa Regional BIEE (Base de Indicadores de Eficiencia Energética para América Latina y el Caribe). Siguiendo el proceso técnico-político y la lógica de funcionamiento del programa de análisis y medición de la eficiencia energética más exitoso del mundo, el Programa ODYSSEE desarrollado por la Comisión Europea y gestionado por la agencia Francesa: ADEME (Agence de l'Environnement et de la Maîtrise de l'Energie), y con la expectativa de producir un conjunto de indicadores específicos metodológicamente consistentes, que permitan medir la evolución de los programas nacionales de eficiencia energética, analizar los resultados en el tiempo y - como consecuencia - tomar las decisiones de políticas que correspondan, desde la CEPAL se ha encarado la labor de capacitar y coordinar la acción de los países de la región con miras a desarrollar una herramienta común que facilite esta labor.