Generation of field mediated three qubit entangled state shared by Alice and Bob

A scheme to generate shared tripartite entangled states, with two-trapped atoms in a cavity held by Alice (qubits A1 and A2) entangled to a single trapped atom in a remote lab owned by Bob (B), is proposed. The entanglement is generated through interaction of trapped atoms with two mode squeezed light shared by the two cavities. The proposed scheme is an extension of the proposal of ref. [W. Son, M. S. Kim, J. Lee, and D. Ahn, J. Mod. Opt. 49, 1739 (2002)], where the possibility of entangling two remote qubits using a bipartite continuous variable state was examined. While the global negativity detects the free entanglement of the three atom mixed state, the bound entanglement is detected by the negativity calculated from pure state decomposition of the state operator. The partial negativities calculated by selective partial transposition of the three atom mixed state detect the pairwise entanglement of qubit pairs A1B, A2B, and A1A2. The entanglement of three atoms is found to be W-like, no GHZ like quantum correlations being generated.Comment: 14 pages, 06 figures, section IV revised, Other minor changes to improve readabilit

Informações gerais sobre a apicultura no Pantanal.

bitstream/CPAP-2009-09/56870/1/FOL133.pd

Pré-diagnóstico da cadeia de produtos apícolas de Mato Grosso do Sul.

Panorama da Apicultura Sul-Mato-Grossense; Caracterização do pré-diagnóstico; Objetivos; Equipe; Municípios; Principais Características avaliadas; Resultados e discussão; Principais desafios para a expansão da apicultura; Principais oportunidades para a expansão da apicultura.bitstream/item/81129/1/DOC60.pd

Apicultura: uma alternativa econômica para o Pantanal.

bitstream/CPAP/56430/1/ADM035.pdfFormato eletrônico

Mel orgânico: oportunidades e desafios para a apicultura no Pantanal.

Panorama dos Produtos Orgânicos; Diferencial de Preço; Legislação Brasileira; Benefícios da Certificação; Entidades Certificadoras; Financiamentos Especiais; Caracterização do Pantanal; Panorama da Apicultura Brasileira; Mel; Classificações; Composição; Valor Nutricional; Produção de Mel Orgânico no Pantanal; Principais Oportunidades; Principais Desafios.bitstream/item/81130/1/DOC59.pd

Peer mentoring: Enhancing economics first years’ academic performance

South African higher education institutions have been grappling with the high dropout rate, specifically at first year level. Despite universities’ attempts to implement various strategies to increase student retention, there is very little or no empirical warrant to validate these attempts of research in the South African context. Hence, the aim of this study is to explore how discipline-specific peer mentoring impacts first year students’ academic performance. The two most significant findings of this study are that firstly, the mean continuous assessment mark of the mentees (73.6) is significantly higher compared to students who were not mentees and, secondly, the mentees’ final examination performance was also higher (60.9 versus 52.9).  This study highlights the possibilities of using peer mentoring to improve first years’ academic performance. The evidence as revealed in the study provides insights into these possibilities. For example, the peer mentees indicated that they the peer mentors weekly motivational messages inspired them to continue with their studies and the continuous support from the peer mentors assisted them to understand the difficult concepts of Economics. While this study did not focus on the peer mentors, we also found that they were willing to participate voluntarily in this programme, as they believed that there are multiple benefits to being a peer mentor. We argue that the implementation of discipline-specific peer mentoring programmes across all disciplines could facilitate student retention and increase the overall pass rate of first year students

On the moments of ruin and recovery times

In this paper we consider the calculation of moments of the time to ruin and the duration of the first period of negative surplus.We present a recursive method by considering a discrete time compound Poisson process used by Dickson et al. [Astin Bull. 25 (2) (1995) 153]. With this method we will also be able to calculate approximations for the corresponding quantities in the classical model. Furthermore, for the classical compound Poisson model we consider some asymptotic formulae, as initial surplus tends to infinity, for the severity of ruin, which allow us to find explicit formulae for the moments of the time to recovery.info:eu-repo/semantics/publishedVersio

How long is the surplus below zero?

Assuming the classical compound Poisson continuous time surplus process, we consider the process as continuing if ruin occurs. Due to the assumptions presented, the surplus will go to infinity with probability one. If ruin occurs the process will temporarily stay below the zero level. The purpose of this paper is to find some features about how long the surplus will stay below zero. Using a martingale method we find the moment generating function of the duration of negative surplus, which can be multiple, as well as some moments. We also present the distribution of the number of negative surpluses. We further show that the distribution of duration time of a negative surplus is the same as the distribution of the time of ruin, given ruin occurs and initial surplus is zero. Finally, we present two examples, considering exponential and Gamma(2,β) individual claim amount distributions.info:eu-repo/semantics/publishedVersio

How many claims does it take to get ruined and recovered?

We consider in the classical surplus process the number of claims occurring up to ruin, by a different method presented by Stanford and Stroinski [Astin Bulletin 24 (2) (1994) 235]. We consider the computation of Laplace transforms (LTs) which ´ can allow the computation of the probability function. Formulae presented are general. The method uses the computation of the probability function of the number of claims during a negative excursion of the surplus process, in case it gets ruined. When initial surplus is zero this probability function allows us to completely define the recursion for the transform above. This uses the fact that in this particular case, conditional time to ruin has the same distribution as the time to recovery, given that ruin occurs. We consider also the computation of moments of the number of claims during recovery time, which with initial surplus zero allows us to compute the moments of the number of claims up to ruin. We end this work by giving some insight on the shapes of the two types of probability functions involved.info:eu-repo/semantics/publishedVersio

Impactos do fenômeno ENOS sobre a temperatura no Brasil.

Neste trabalho, a variabilidade das temperaturas máximas e mínimas mensais de 265 estações convencionais, componentes do Banco de Dados Meteorológicos para Ensino e Pesquisa (BDMEP do INMET), nos últimos 50 anos, foi relacionada com as variações do Oceanic Niño Index do NOAA Climate Prediction Center através do treinamento de uma rede neural artificial. Os resultados da pesquisa mostram a relação quase que direta entre ENOS (El Niño-Oscilação Sul) e as temperaturas máximas e mínimas mensais no Brasil. Foram escolhidas algumas localidades para demonstrar os resultados da pesquisa: Manaus, Recife, Cuiabá, Brasília, São Paulo e Porto Alegre. Os eventos de El Niño contribuem para o aumento das temperaturas máximas e mínimas enquanto o inverso ocorre em eventos de La Niña, exceto para a região Amazônica. Em anos de La Niña ocorrem diminuição das temperaturas do ar em quase todas as regiões do Brasil. O impacto do fenômeno ENOS no país se faz mais presente nos meses de inverno e primavera.bitstream/item/76849/1/Impactos-fenomeno.pd