6,070 research outputs found

    Home-Based Parent-Child Therapy in Low-Income African American, Caucasian, and Latino Families: A Comparative Examination of Treatment Outcomes

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    This study examined parent and child treatment outcomes for a home-based Parent-Child Therapy (PCT) program for 66 children from families living in poverty. African American, Caucasian, and Latino families were examined to determine if an evidence-based program would produce similar results across different ethnic groups. The results showed that caregivers across the three ethnic groups reported improved child challenging behavior, increased positive parent-child interactions, improved parental expectations, higher levels of nurturing, and less reliance on verbal and corporal punishment as a form of discipline. Practical implications for these results are discussed

    Fractal Conductance Fluctuations of Classical Origin

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    In mesoscopic systems conductance fluctuations are a sensitive probe of electron dynamics and chaotic phenomena. We show that the conductance of a purely classical chaotic system with either fully chaotic or mixed phase space generically exhibits fractal conductance fluctuations unrelated to quantum interference. This might explain the unexpected dependence of the fractal dimension of the conductance curves on the (quantum) phase breaking length observed in experiments on semiconductor quantum dots.Comment: 5 pages, 4 figures, to appear in PR

    Resisting bare life : civil solidarity and the hunt for illegalized migrants

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    While European governments have pursued illegalized migrants for decades, the techniques through which they do so have taken a more radical turn since 2015. Focusing on the particular case of Belgium, this paper documents how its Federal government has increasingly tried to “police” migrants into the European refugee regime, while migrants and citizens have continued to resist these efforts through a series of “political” actions. Drawing on ethnographic work with the Brussels‐based Citizen Platform for the Support of Refugees, I pursue two aims: first, I demonstrate how the Belgian state has consciously produced a humanitarian crisis as part of a broader “politics of exhaustion”; and second, I explore the specific forms and types of humanitarian action that emerge from citizens’ response to these policies. I do so by describing three moments in which these opposing logics of policing and politicization conjure

    First Calorimetric Measurement of OI-line in the Electron Capture Spectrum of 163^{163}Ho

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    The isotope 163^{163}Ho undergoes an electron capture process with a recommended value for the energy available to the decay, QECQ_{\rm EC}, of about 2.5 keV. According to the present knowledge, this is the lowest QECQ_{\rm EC} value for electron capture processes. Because of that, 163^{163}Ho is the best candidate to perform experiments to investigate the value of the electron neutrino mass based on the analysis of the calorimetrically measured spectrum. We present for the first time the calorimetric measurement of the atomic de-excitation of the 163^{163}Dy daughter atom upon the capture of an electron from the 5s shell in 163^{163}Ho, OI-line. The measured peak energy is 48 eV. This measurement was performed using low temperature metallic magnetic calorimeters with the 163^{163}Ho ion implanted in the absorber. We demonstrate that the calorimetric spectrum of 163^{163}Ho can be measured with high precision and that the parameters describing the spectrum can be learned from the analysis of the data. Finally, we discuss the implications of this result for the Electron Capture 163^{163}Ho experiment, ECHo, aiming to reach sub-eV sensitivity on the electron neutrino mass by a high precision and high statistics calorimetric measurement of the 163^{163}Ho spectrum.Comment: 5 pages, 3 figure

    Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter

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    The Thorium-229 isotope features a nuclear isomer state with an extremely low energy. The currently most accepted energy value, 7.8 +- 0.5 eV, was obtained from an indirect measurement using a NASA x-ray microcalorimeter with an instrumental resolution 26 eV. We study, how state-of-the-art magnetic metallic microcalorimeters with an energy resolution down to a few eV can be used to measure the isomer energy. In particular, resolving the 29.18 keV doublet in the \gamma-spectrum following the \alpha-decay of Uranium-233, corresponding to the decay into the ground and isomer state, allows to measure the isomer transition energy without additional theoretical input parameters, and increase the energy accuracy. We study the possibility of resolving the 29.18 keV line as a doublet and the dependence of the attainable precision of the energy measurement on the signal and background count rates and the instrumental resolution.Comment: 32 pages, 8 figures, eq. (3) correcte
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