Speed Kills: Effects of Vehicle Speed on Avian Escape Behavior

The avoidance of vehicles is a common challenge for birds in the modern world. Birds generally rely on antipredator behaviors to avoid vehicles, but modern vehicles are faster than predators. We predicted that birds may be unable to accurately estimate the speed of approaching vehicles, which could contribute to miscalculations in avoidance behaviors and cause collisions. We tested our prediction in two studies. In the first (DeVault et al. 2014), we baited turkey vultures (Cathartes aura) to roads with animal carcasses and measured flight initiation distance (FID) when driving a truck towards them at 30, 60, or 90 km/h. Despite a wide range of responses, FID of vultures increased by a factor of 1.85 as speed increased from 30 to 90 km/h. At 90 km/h there was no clear trend in FID across replicates; birds were equally likely to initiate escape behavior at 40 m as at 220 m. Seventeen percent of vehicle approaches at 90 km/h resulted in near collisions with vultures, compared to none during 60 km/h approaches and 4% during 30 km/h approaches. In the second experiment (DeVault et al. 2015), we used video playback to investigate escape behaviors of captive brown-headed cowbirds (Molothrus ater) in response to virtual vehicles appearing to approach at speeds ranging from 60-360 km/h. Flight initiation distance remained similar across vehicle speeds, indicating that avoidance behaviors in cowbirds were based on distance rather than time available for escape. Cowbirds generally did not initiate flight with enough time to avoid “collision” when virtual vehicle speed exceeded 120 km/h. Although potentially effective for escaping predators, the decision-making processes used by turkey vultures and cowbirds in our experiments appear maladaptive in the context of avoiding vehicles, and may represent important determinants of bird-vehicle collisions

Non-Hermitian SUSY Hydrogen-like Hamiltonians with real spectra

It is shown that the radial part of the Hydrogen Hamiltonian factorizes as the product of two not mutually adjoint first order differential operators plus a complex constant epsilon. The 1-susy approach is used to construct non-hermitian Hamiltonians with hydrogen spectra. Other non-hermitian Hamiltonians are shown to admit an extra `complex energy' at epsilon. New self-adjoint hydrogen-like Hamiltonians are also derived by using a 2-susy transformation with complex conjugate pairs epsilon, (c.c) epsilon.Comment: LaTeX2e file, 13 pages, 6 EPS figures. New references added. The present is a reorganized and simplified versio

Funcionamento cognitivo e produção narrativa no síndrome de Williams : congruência ou dissociação neurocognitiva?

Uma questão central na teoria de desenvolvimento neurocognitivo consiste no debate acerca da existência de fenómenos de verdadeira dissociação neurocognitiva. Recentemente, no entanto, vários autores têm defendido a existência de uma dinâmica probabilística entre genótipo, organização cerebral e funcionamento cognitivo. O síndrome de Williams é uma perturbação do neurodesenvolvimento cujo estudo pode ajudar à clarificação deste debate. Neste sindrome estamos perante uma perturbação genética identificada, uma organização cerebral específica e um intrigante perfil cognitivo onde uma relativa preservação dos domínios sócio-linguísticos co-existe a par de défices significativos no funcionamento cognitivo geral e visuo-espacial. Com o objectivo de investigar o perfil narrativo no síndrome de Williams, 14 indivíduos diagnosticados com esta perturbação genética foram avaliados numa tarefa de indução narrativa, em termos da estrutura, processo e conteúdo das suas narrativas. Os resultados apontam para o facto destes pacientes apresentarem profundos deficits na produção narrativa, evidenciando unicamente a preservação de alguns marcadores sociais presentes no processo de contar a história. Os dados desta investigação são apresentados e discutidos em termos das suas implicações neurodesenvolvimentais.A central issue on neurocognitive development theory concerns the debate on the existence of truly cognitive dissociation phenomena. Recently, however, several authors have been claiming that there is only a probabilistic dynamic between genotype, brain organization and cognitive functioning. Williams syndrome is a neurodevelopmental disorder that could help clarifying this debate. In this syndrome we have an identifiable genetic disorder, a specific brain organization, and a intriguing cognitive profile where the relative preservation of socio-linguistic domains coexists with significant deficits in general cognitive and visuo-spacial functioning. With the objective of inquiring more deeply on the narrative profile of Williams syndrome, 14 patients diagnosed with this genetic disorder were analyzed in terms of narrative structure, process and content both in structured narrative induction task. Data shows that these patients have profound deficits in narrative production showing only a slight preservation in some social markers of the story telling process. Data from this research is presented and discussed in terms of their neurodevelpmental implications.Una cuestión central en la teoría del desarrollo neurocognitivo consiste en el debate acerca de la existencia de fenómenos de verdadera disociación neurocognitiva. Recientemente, varios autores han defendido la existencia de una dinámica probabilística entre genotipo, organización cerebral y funcionamiento cognitivo. El síndrome de Williams es un trastorno del neurodesarrollo cuyo estudio puede ayudar a clarificar este debate. En este síndrome nos encontramos ante un trastorno genético identificado, una organización cerebral específica y un intrigante perfil cognitivo donde una relativa preservación de los dominios socio-lingüísticos coexiste con déficit significativos en el funcionamiento cognitivo general y visuo-espacial. Con el propósito de investigar el perfil narrativo en el síndrome de Williams, 14 individuos diagnosticados con este trastorno genético han sido evaluados en una tarea de inducción narrativa, en términos de estructura, proceso y contenido de sus narrativas. Los resultados nos muestran que estos pacientes presentan profundos déficit en la producción narrativa, evidenciando únicamente la preservación de algunos marcadores sociales presentes en el proceso de contar la historia. Los datos de esta investigación son presentados y discutidos en términos de sus implicaciones en el neurodesarrollo

RoboSTEAM Project Systematic Mapping: Challenge Based Learning and Robotics

STEAM Education is nowadays a key element for our current digital society. Integrating STEAM and developing competences such as Computational Thinking is highly demanded by the industry and higher education institutions. In order to do so new methodological approaches are required. RoboSTEAM project is an Erasmus+ project defined to address these topics by using of physical devices and robotics employing Challenge Based Learning methodology. One of the first steps in the project development is the definition of current landscape in the research field. Which means to carry out a literature mapping that considers previous applications of Challenge Based Learning in STEAM education and use of robots and physical devices to do so. This paper shows the mapping review process and the main results obtained. The mapping analyze 242 candidate works from the most relevant bibliographic sources and selected 54. Form them it was possible to see that there are not many initiatives on STEM Education related to Challenge base learning and the most of them are specially focused on the application of specific tools and in the development of concrete competences

Beyond conventional factorization: Non-Hermitian Hamiltonians with radial oscillator spectrum

The eigenvalue problem of the spherically symmetric oscillator Hamiltonian is revisited in the context of canonical raising and lowering operators. The Hamiltonian is then factorized in terms of two not mutually adjoint factorizing operators which, in turn, give rise to a non-Hermitian radial Hamiltonian. The set of eigenvalues of this new Hamiltonian is exactly the same as the energy spectrum of the radial oscillator and the new square-integrable eigenfunctions are complex Darboux-deformations of the associated Laguerre polynomials.Comment: 13 pages, 7 figure

Cognitive profile in William syndrome: a case study

Williams Syndrome (WS) is a rare neurodevelopmental disorder, approximately occurring 1 in 20 000 live births, caused by a submicroscopic deletion on band q11.22-23 in chromosome 7. Their clinical characteristics include an uneven profile, characterised by physical, developmental and neurocognitive features. They also present desadaptative behaviours, with a strong impulse to social contact. Given this uneven cognitive, behavioural and neuroanatomic profile, this paper focuses on exploring these specific features. In order to do this, we used a broad neuropsychological battery and analysed the data to design an individualized rehabilitation program, which focus was to improve weak areas of performance.Fundação para a Ciência e Tecnologia - SFRH/B/PD/9396, SFRH/BD/1609/2004. POCTI/PSI/58364/2004)

Controlling the dominant magnetic relaxation mechanisms for magnetic hyperthermia in bimagnetic core-shell nanoparticles

We report a simple and effective way to control the heat generation of a magnetic colloid under alternate magnetic fields by changing the shell composition of bimagnetic core-shell Fe 3 O 4 /Zn x Co 1-x Fe 2 O 4 nanoparticles. The core-shell structure constitutes a magnetically-coupled biphase system, with an effective anisotropy that can be tuned by the substitution of Co 2+ by Zn 2+ ions in the shell. Magnetic hyperthermia experiments of nanoparticles dispersed in hexane and butter oil showed that the magnetic relaxation is dominated by Brown relaxation mechanism in samples with higher anisotropy (i.e., larger concentration of Co within the shell) yielding high specific power absorption values in low viscosity media as hexane. Increasing the Zn concentration of the shell, diminishes the magnetic anisotropy, which results in a change to a Néel relaxation that dominates the process when the nanoparticles are dispersed in a high-viscosity medium. We demonstrate that tuning the Zn contents at the shell of these exchange-coupled core/shell nanoparticles provides a way to control the magnetic anisotropy without loss of saturation magnetization. This ability is an essential prerequisite for most biomedical applications, where high viscosities and capturing mechanisms are present. This journal i

14,000 years of climatic and anthropogenic change in the Afromontane forest of São Tomé Island, Gulf of Guinea

São Tomé (Gulf of Guinea, Central Africa) is a 854 km2 tropical island that had a pivotal role in early European colonial expansion through the Atlantic between the 15th and 16th centuries. Historical sources suggest that native vegetation has been heavily impacted since human arrival (1470 CE) due to monoculture economies and the introduction of mammals and plants, some of which now have established wild populations. The Afromontane forest of São Tomé, located above 800 m.a.sl., is particularly rich in endemic plant species and has remained relatively unaffected by direct human impacts. Here, we explore how environmental change influenced this forest through the study of a sedimentary sequence from the volcanic crater of Lagoa Amélia (1340 m a.s.l.), a palustrine system located at the boundary between submontane (800–1400 m a.s.l.) and mist forest (above 1400 m a.s.l.). We used fossil pollen, non-pollen palynomorphs, sedimentology and charcoal to determine forest dynamics from the Late Pleistocene to the present. From 14,000 to 12,500 cal yr BP the forest was dominated by taxa from higher altitudes, adapted to cooler and drier climates (e.g. Afrocarpus mannii trees and Psychotria nubicola). After 12,500 cal yr BP, a potential uphill migration was identified by an increase in taxa like the trees Symphonia globulifera and Craterispermum cerinanthum. From 11,200 cal yr BP through the rest of the Holocene taxa from lower altitudes became dominant (e.g. Prunus africana, Polyscias, and Sabicea), except at c. 8500 cal yr BP when rapid cooling led to forest opening. Charcoal showed that fires were frequent during the Late Pleistocene (14,000 to 11,200 cal yr BP), becoming rare during the Holocene until anthropogenic fires started at c. 220 cal yr BP. Other recent anthropogenic impacts detected in Lagoa Amélia included the appearance of pollen of introduced plant species (e.g., Cestrum), and the increase in pollen of economically important species (Elaeis guineensis, Zea mays) and in fungal spores related to introduced herbivores. Our results reveal that climate changed the altitudinal distribution of the Afromontane forest in São Tomé during the Late Pleistocene, as observed on the African continent, and that this ecosystem was also strongly impacted by human arrival, through fire, farming, and introduced species.info:eu-repo/semantics/publishedVersio

Results of the engineering run of the coherent neutrino nucleus interaction experiment (CONNIE)

The CONNIE detector prototype is operating at a distance of 30 m from the core of a 3.8 GWth nuclear reactor with the goal of establishing Charge-Coupled Devices (CCD) as a new technology for the detection of coherent elastic neutrino-nucleus scattering. We report on the results of the engineering run with an active mass of 4 g of silicon. The CCD array is described, and the performance observed during the first year is discussed. A compact passive shield was deployed around the detector, producing an order of magnitude reduction in the background rate. The remaining background observed during the run was stable, and dominated by internal contamination in the detector packaging materials. The in-situ calibration of the detector using X-ray lines from fluorescence demonstrates good stability of the readout system. The event rates with the reactor ON and OFF are compared, and no excess is observed coming from nuclear fission at the power plant. The upper limit for the neutrino event rate is set two orders of magnitude above the expectations for the standard model. The results demonstrate the cryogenic CCD-based detector can be remotely operated at the reactor site with stable noise below2 e RMS and stable background rates. The success of the engineering test provides a clear path for the upgraded 100 g detector to be deployed during 2016.Fil: Aguilar Arevalo, A.. Universidad Nacional Autónoma de México; MéxicoFil: Bertou, Xavier Pierre Louis. Comisión Nacional de Energía Atómica; Argentina. Comisión Nacional de Energía Atómica. Fundación José A. Balseiro; ArgentinaFil: Bonifazi, C.. Universidade Federal do Rio de Janeiro; BrasilFil: Butner, M.. Fermi National Accelerator Laboratory; Estados UnidosFil: Cancelo, G.. Fermi National Accelerator Laboratory; Estados UnidosFil: Castañeda Vazquez, A.. Universidad Nacional Autónoma de México; MéxicoFil: Cervantes Vergara, B.. Universidad Nacional Autónoma de México; MéxicoFil: Chavez, C. R.. Universidad Nacional de Asunción; ParaguayFil: Da Motta, H.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: D'Olivo, J. C.. Universidad Nacional Autónoma de México; MéxicoFil: Dos Anjos, J.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: Estrada, J.. Fermi National Accelerator Laboratory; Estados UnidosFil: Fernández Moroni, Guillermo. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto ; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ford, R.. Fermi National Accelerator Laboratory; Estados UnidosFil: Foguel, A.. Centro Brasileiro de Pesquisas Físicas; Brasil. Universidade Federal do Rio de Janeiro; BrasilFil: Hernandez Torres, K. P.. Universidad Nacional Autónoma de México; MéxicoFil: Izraelevitch, F.. Fermi National Accelerator Laboratory; Estados UnidosFil: Kavner, A.. University of Michigan; Estados UnidosFil: Kilminster, B.. Universitat Zurich; SuizaFil: Kuk, K.. Fermi National Accelerator Laboratory; Estados UnidosFil: Lima Jr, H. P.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: Makler, M.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: Molina, J.. Universidad Nacional de Asunción; ParaguayFil: Moreno Granados, G.. Universidad Nacional Autónoma de México; MéxicoFil: Moro, Juan Manuel. Universidad Nacional del Sur. Departamento de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Paolini, Eduardo Emilio. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto ; ArgentinaFil: Sofo Haro, Miguel Francisco. Comision Nacional de Energia Atomica. Gerencia D/area de Energia Nuclear; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Tiffenberg, Javier Sebastian. Fermi National Accelerator Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Trillaud, F.. Universidad Nacional Autónoma de México; MéxicoFil: Wagner, S.. Centro Brasileiro de Pesquisas Físicas; Brasil. Pontificia Universidade Católica do Rio Grande do Sul; Brasi

Mechanism of Insulin Emission in Matrix Assisted Laser Ionization

In the present paper the emission of intact insulin quasi-molecular ion [M+H] + during laser ablation (MALDI) is studied. It was observed in particular that the insulin TOF molecular peak increases as the laser power increases. The DE-Vestal method for the initial velocity measurements was improved theoretically including the distance (d0) until the free expansion regime can be considered. According to the present analysis, the v0 parameter given by the DE-Vestal method is interpreted as the initial velocity that the desorbed ion would have if no collision occurs in the plasma. The improved method interprets v 0 as the "final" initial velocity, i.e., as the velocity that the desorbed ions have when the plasma free expansion starts and, effectively, collisions no longer occur. The new method allows also the determination of d 0 , the distance to the solid when the free expansion starts. The data fitting shows that the distance (d0) has a linear dependence on the laser's intensity. Extrapolation of these values gives I = 0.69 G W cm −2 as the minimum energy density necessary to produce high density plasma during the insulin ions desorption when using αCHCA matrix