The impact of time limitation: insights from a queueing experiment

We experimentally explore the effects of time limitation on decision making. Under different time allowance conditions, subjects are presented with a queueing situation and asked to join one of the two given queues. The results can be grouped under two main categories. The first one concerns the factors driving decisions in a queueing system. Only some subjects behave consistently with rationality principles and use the relevant information efficiently. The rest of the subjects seem to adopt a simpler strategy that does not incorporate some information into their decision. The second category is related to the effects of time limitation on decision performance. A substantial proportion of the population is not affected by time limitations and shows consistent behavior throughout the treatments. On the other hand, some subjects’ performance is impaired by time limitations. More importantly, this impairment is not due to the stringency of the limitation but rather to being exposed to a time constraint

Determinação de perdas na colheita de soja: copo medidor da Embrapa.

A soja e a colheita. Principais fatores relacionados às perdas de grãos na colheita da soja. Determinação das perdas de grãos na colheita de soja pelo método do copo medidor desenvolvido pela Embrapa. Sisteam de corte e de alimentação. Sistema de trilha.Sistemas de separação e de limpeza. Sistemas de transporte, armazenamento e descarga. Problemas, causas e soluções observadas na colheita mecanizada de soja.bitstream/item/97495/1/Manual-Copo-Medidor-baixa-completo.pdfCatálogo 05 publicado em dezembro de 2013

A natureza da ciência empírica segundo Berkeley

Tradução para o português do capítulo 5 do livro "Berkeley" (Oxford University Press, 1982), Cap. 5, p. 47-57. Republicado em The British Empiricists: Locke, Berkeley, Hume (Oxford University Press, 1992)

Modeling, Simulation and Emulation of Intelligent Domotic Environments

Intelligent Domotic Environments are a promising approach, based on semantic models and commercially off-the-shelf domotic technologies, to realize new intelligent buildings, but such complexity requires innovative design methodologies and tools for ensuring correctness. Suitable simulation and emulation approaches and tools must be adopted to allow designers to experiment with their ideas and to incrementally verify designed policies in a scenario where the environment is partly emulated and partly composed of real devices. This paper describes a framework, which exploits UML2.0 state diagrams for automatic generation of device simulators from ontology-based descriptions of domotic environments. The DogSim simulator may simulate a complete building automation system in software, or may be integrated in the Dog Gateway, allowing partial simulation of virtual devices alongside with real devices. Experiments on a real home show that the approach is feasible and can easily address both simulation and emulation requirement

Remove Noise in Video with 3D Topological Maps

International audienceIn this paper we present a new method for foreground masks denoising in videos. Our main idea is to consider videos as 3D images and to deal with regions in these images. Denoising is thus simply achieved by merging foreground regions corresponding to noise with background regions. In this framework, the main question is the definition of a cri-terion allowing to decide if a region corresponds to noise or not. Thanks to our complete cellular description of 3D images, we can propose an advanced criterion based on Betti numbers, a topological invariant. Our results show the interest of our approach which gives better results than previous methods

Laser-driven quantum magnonics and THz dynamics of the order parameter in antiferromagnets

The impulsive generation of two-magnon modes in antiferromagnets by femtosecond optical pulses, so-called femto-nanomagnons, leads to coherent longitudinal oscillations of the antiferromagnetic order parameter that cannot be described by a thermodynamic Landau-Lifshitz approach. We argue that this dynamics is triggered as a result of a laser-induced modification of the exchange interaction. In order to describe the oscillations we have formulated a quantum mechanical description in terms of magnon pair operators and coherent states. Such an approach allowed us to} derive an effective macroscopic equation of motion for the temporal evolution of the antiferromagnetic order parameter. An implication of the latter is that the photo-induced spin dynamics represents a macroscopic entanglement of pairs of magnons with femtosecond period and nanometer wavelength. By performing magneto-optical pump-probe experiments with 10 femtosecond resolution in the cubic KNiF$_3$ and the uniaxial K$_2$NiF$_4$ collinear Heisenberg antiferromagnets, we observed coherent oscillations at the frequency of 22 THz and 16 THz, respectively. The detected frequencies as a function of the temperature ideally fit the two-magnon excitation up to the N\'eel point. The experimental signals are described as dynamics of magnetic linear dichroism due to longitudinal oscillations of the antiferromagnetic vector.Comment: 25 pages, 10 figure

Demanda de tração, mobilização de solo na linha de semeadura e rendimento da soja, em plantio direto.

Resumo O objetivo deste trabalho foi avaliar a relação entre a força de tração (FT) na haste sulcadora de adubo e o volume de solo mobilizado na linha de semeadura em função da quantidade de resíduos, do tráfego de rodados de trator e da profundidade de sulcamento, e sua influência sobre a performance agronômica da soja. Os tratamentos englobaram seis doses de resíduos culturais (DR), duas profundidades de trabalho das hastes sulcadoras (PT) e duas condições de tráfego – com e sem tráfego de rodados de trator –, em blocos ao acaso e parcelas subsubdivididas. Os tratamentos foram aplicados com e sem irrigação, em Argissolo Vermelho, sob plantio direto. As diferentes PT e condições de tráfego influenciaram significativamente a FT. Independentemente da condição de irrigação, as DR não influenciaram a produtividade de grãos e a massa seca da parte aérea da soja. Sem irrigação, a produtividade da soja aumentou em 180 kg ha?1 quando a PT passou de 0,064 para 0,10 m, o que demonstra que a aplicação do fertilizante a profundidades maiores é uma prática viável para diminuir os efeitos da seca sobre a cultura. Termos para indexação: Avena strigosa, Glycine max, doses de resíduo, força de tração, semeadora de precisão

Treatment-limiting decisions, comorbidities, and mortality in the emergency departments: a cross-sectional elderly population-based study

BACKGROUND: Older adults experience a higher risk of death in the emergency departments (EDs), in part, as a result of their comorbidities. A treatment-limiting decision is often reported for older adults who die in the EDs. The Charlson Comorbidity Index (CCI) is a validated method for the scoring of comorbidities. Whether an association between the CCI and treatment-limiting decisions exists remains unknown. OBJECTIVE: To determine whether the CCI was associated with the treatment-limiting decisions made for older patients who die in the EDs. METHODS: A total of 2,095 patients >/=65 years old who died in the EDs in France and Belgium were prospectively included between 2004 and 2005. The recorded data included: 1) the CCI score; 2) patient age; 3) gender; 4) living in senior housing facilities; 5) hospitalizations occurring in the previous year; 6) presence of functional limitations (according to the Knaus classification); 7) chronic diseases; and 8) presence of organ failure(s). A treatment-limiting decision was defined as a predetermined choice not to implement therapies that would otherwise be required to sustain life. RESULTS: A treatment-limiting decision was identified in 993 (47%) patients. Fully-adjusted logistic regression model showed that a CCI >/= 5 (OR=25.56 with P=0.037), age >/=85years (OR=20.33 with P<0.001), living in an institution (OR=0.15 with P=0.017), hematologic (OR=6.92 with P=0.020) and respiratory disease (OR=0.17 with P=0.046), and neurologic causes (OR=0.20 with P=0.010) of organ failure were significantly associated with treatment-limiting decisions. CONCLUSION: An elevated CCI score (>/=5) was associated with a treatment-limiting decision in elderly patients evaluated in the EDs. Further research is needed to corroborate this finding