Sacrifice and Efficiency of the Income Tax Schedule

We investigate the efficiency of equal sacrifice tax schedules in an economywhich primitives are exactly those in Mirrlees (1971): a continuum of individualswith identical preferences defined over consumption and leisure who differ withrespect to their labor market productivity. Using a separable specification forpreferences we derive the minimum equal sacrifice allocation and recover thetax schedule that implements it. The separable specification allows us to usethe methodology developed by Werning (2007b) to check whether the scheduleis efficient, that is, whether there is no alternative tax schedule that raises morerevenue while delivering less utility to no one. We find that inefficiency does notarise for most parametrizations we use to approximate the US economy. For thefew cases for which inefficiency does arise, it does so only for very high levels ofincome and marginal tax rates.

Monte Carlo study of the critical temperature for the planar rotator model with nonmagnetic impurities

We performed Monte Carlo simulations to calculate the Berezinskii-Kosterlitz-Thouless (BKT) temperature $T_{BKT}$ for the two-dimensional planar rotator model in the presence of nonmagnetic impurity concentration $(\rho)$. As expected, our calculation shows that the BKT temperature decreases as the spin vacancies increase. There is a critical dilution $\rho_c \approx 0.3$ at which $T_{BKT} =0$. The effective interaction between a vortex-antivortex pair and a static nonmagnetic impurity is studied analytically. A simple phenomenological argument based on the pair-impurity interaction is proposed to justify the simulations.Comment: 5 pages, 5 figures, Revetex fil

Desempenho agronômico de leguminosas forrageiras nos cerrados de Rondônia.

Avaliou-se desempenho agronômico de leguminosas forrageiras, visando selecionar aquelas mais promissoras para formação de pastagens melhoradas nos cerrados de Rondônia. Conclui-se que: Leguminosas forrageiras mais promissoras para formação e/ou renovacção de pastagens nas condições edafoclimáticas dos cerrados de Rondônia foram S. guianensis cv. Minerao, S. guianensis var. Pauciflora BRA-001333 e BRA-008150, S. guianensis var. Vulgaris BRA-019097, S. macrocephala BRA-008419, C. acutifolium BRA-009237, BRA-006483, BRA-009227 e C. brasilianum BRA-006025 e BRA-012297.bitstream/item/81361/1/FOL-4457-0001.pd

Levantamento da incidência do amarelinho ou CVC nos pomares de citros no Estado do Amazonas.

Levantamento da doenca amarelinha causada pela bacteria Xylella fastidiosa nos pomares de citros no Estado do Amazonas (Brasil).bitstream/item/83143/1/Pesquisa-99-1999.pd

Vortex behavior near a spin vacancy in 2D XY-magnets

The dynamical behavior of anisotropic two dimensional Heisenberg models is still a matter of controversy. The existence of a central peak at all temperatures and a rich structure of magnon peaks are not yet understood. It seems that the central peaks are related, in some way, to structures like vortices. In order to contribute to the discussion of the dynamical behavior of the model we use Monte Carlo and spin dynamics simulations as well analytical calculations to study the behavior of vortices in the presence of nonmagnetic impurities. Our simulations show that vortices are attracted and trapped by the impurities. Using this result we show that if we suppose that vortices are not very much disturbed by the presence of the impurities, then they work as an attractive potential to the vortices explaining the observed behavior in our simulations.Comment: 4 pages, 6 figure

Controle químico da Sigatoka negra da bananeira. I - Trifloxistrobin, Propiconazole e Difenoconazole.

A Sigatoka negra, causada pelo fungo Mycosphaerella fijiensis (fase anamórfica: Paracercospora fijiensis (Morelet) Deighton, é a doença mais grave da bananeira, causando perdas de 100% da produção, quando não se efetua o controle. Os fungicidas trifloxistrobin, difenoconazole e propiconazole, foram eficientes no controle da Sigatoka negra, aplicados a intervalos regulares de 14 dias.bitstream/CPAA-2009-09/6808/1/ComTec-7.pd

Caracterização climática e aptidão das culturas anuais e perenes no zoneamento pedoclimático do Estado do Mato Grosso do Sul - 1ª fase.

bitstream/CNPS-2010/14920/1/bpd99-caracterizacao-culturas.pd

Epidemiologia da sigatoka negra da bananeira (Musa spp).

Estudo sobre o progresso da sigatoka negra em bananeiras, associado a variacoes e/ou efeitos de variaveis climaticas, que permitem prever as epocas de maior severidade e/ou surtos da doenca, de forma a estabelecer estrategias de controle mais viaveis do ponto de vista economico-ambiental no Estado do Amazonas (Brasil).bitstream/item/76938/1/CPAA-PESQ.-AND.-34-99.pd

The impact of breast cancer treatments on sleep quality 1 year after cancer diagnosis

Purpose: The increasing number of women living longer with potential side effects of breast cancer treatment highlights the need of a comprehensive assessment of its burden. Therefore, we aimed to quantify the relation between different breast cancer treatments and sleep quality 1 year after diagnosis. Methods: A cohort of 502 newly diagnosed breast cancer patients was prospectively followed. Sleep quality was evaluated with the Pittsburgh Sleep Quality Index (PSQI), at baseline and at the 1-year follow-up. Odds ratios (OR) were computed to quantify the association between patient characteristics and poor sleep quality (PSQI score >5) at baseline, and relative risks (RR) were computed for the association between treatments and the occurrence of poor sleep quality at 1 year. Results A total of 60.2% of the patients had poor sleep quality before breast cancer treatments, especially those with anxiety [OR = 2.86, 95% confidence interval (95%CI) 1.92 to 4.27] or depression (OR = 5.25, 95%CI 2.01 to 13.67). Radiotherapy increased the risk of poor sleep quality at 1 year (RR = 3.71, 95%CI 1.15 to 11.96, for a cumulative dose >50 Gy) and there was a tendency for a higher risk in those submitted to chemotherapy, although not statistically significant. Conclusions Our study shows that sleep disturbances are frequent before cancer treatment and confirms their co-occurrence with other medical conditions, such as anxiety and depression. Different breast cancer treatments increase the risk of impaired sleep quality, therefore contributing to the global disability associated with cancer treatments.FF and ARC have received co-funded by the BFundação para a Ciência e a Tecnologia^ and the POPH/FSE Program (grant numbers SFRH/BD/92630/2013 and SFRH/BD/102181/2014, respectively). Data management activities were supported by the Chair on Pain Medicine of the Faculty of Medicine, University of Porto and by the Grünenthal Foundation – Portugal

How does sustainability affect consumer choices in the fashion industry?

The fashion industry being one of the most polluting industries in the world means that it is an industry with an immense potential for change. Consumers are central and are closely intertwined with how companies act. This research reflects consumer perspectives and practices towards the topic of sustainability implemented in the fashion industry. The relevance of sustainability in the fashion industry and the key role of consumers in its implementation are undeniable and confirmed by consumers in a representation of general awareness and concern, despite not always being translated into actual practices. A qualitative research methodology, followed by a set of interviews conducted with consumers, revealed that the great majority are implementing a variety of practices when making their buying choices towards fashion items. Barriers such as lack of education, information, knowledge and transparency were identified, and this aspect was shared by consumers as a reason why they are not motivated to make more conscious decisions. Companies should educate consumers from a general perspective and focus on the group of consumers that are not implementing sustainability in the fashion industry in their buying choices, as they represent the potential for the future.info:eu-repo/semantics/publishedVersio