1,284 research outputs found
Low-energy Cross Section Measurements of
Get PDFThe 12C(p, γ)13N reaction cross section is currently under investigation in the low-background environment of the Laboratory for Underground Nuclear Astrophysics (LUNA). It is being studied using different types of solid targets, and employing two complementary detection techniques: HPGe spectroscopy and activation counting. To reduce systematic uncertainties, targets have been accurately characterized and their degradation under the intense beam of the LUNA-400 accelerator monitored. We present the experimental techniques and the corresponding analyses used to extract the reaction cross section
Study of proton capture on carbon-13 isotope at LUNA
No full text13C(p, γ)14N is a key reaction in different stellar environments for which both accurate and precise measurements of its cross section are required to constraint stellar models. This is currently ongoing at the Laboratory for Underground Nuclear Astrophysics where in addition to the low-background environment, the use of different detection systems (HPGe and BGO detectors) and analysis techniques (Peak Shape Analysis and Sum Peak Method) allowed to perform reaction cross section measurements at the lowest energy ever. Both the setup employed in the measurements and the analysis performed are presented in this paper. © 2023 Institute of Physics Publishing. All rights reserved
Speed of Publication of Statutes and Regulations in the United Kingdom, Canada, and the United States
No full textExamines reasons for typical delays in publication of statutes & regulations in UK,US, & Canada. Finds US federal laws published more slowly because of time taken to add marginal notes after enactmen
Legal Citation Form: Theory and Practice
No full textSets forth 13 principles as a basis for a system of legal citation forms, and critically reviews various rules in the 13th edition of A Uniform System of Citation
Normative reconstruction and social character of freedom in Axel Honneth
Get PDFO presente objeto de pesquisa busca proceder ao estudo e identificação dos traços essenciais envolvidos na abordagem teórica das relações sociais e políticas trazidas na obra O Direito da Liberdade do filósofo alemão Axel Honneth. Faz-se uma análise da influência hegeliana sobre o conceito de liberdade, assim como dos fatores relacionados com o suprimento das carências subjetivas, mediadas pelas diferentes “esferas” sociais. Honneth, assim, procura trazer à tona a compreensão de um novo modelo de liberdade advindo da Filosofia do Direito de Hegel, o qual se distingue substancialmente dos modelos tradicionais. O autor busca evidenciar a limitação das teorias da justiça de tradição liberal, invocando a necessidade de uma visão integrada das relações sociais experimentadas nas esferas referidas por Hegel, concebendo-se uma experiência concreta de liberdade social. Nesse sentido, evidencia-se o caráter interdisciplinar e emancipatório do método de reconstrução normativa como base teórica para a justificação pública nas sociedades modernas.This research object aims to study and identify the essential traits involved in the theoretical approach of social and political relations brought in the work Freedom’s Right by the german philosopher Axel Honneth. It analyses the hegelian influence on the concept of freedom, as well as the factors related to the supply of subjective needs, mediated by the different social "spheres". Honneth thus seeks to bring to light the understanding of a new model of freedom stemming from Hegel’s Philosophy of Law, which differs substantially from traditional models. The author seeks to highlight the limitation of liberal theories of justice, invoking the need for an integrated view of the social relations experienced in the spheres referred to by Hegel, conceiving a concrete experience of social freedom. In this sense, the interdisciplinary and emancipatory character of the normative reconstruction method is evidenced, as a theorical basis for public justification in modern societies
23Na(p,γ)24Mg Cross Section Measurements
Get PDFAs a link between the NeNa and MgAl cycles in stellar burning, the reaction 23Na(p,γ)24Mg is of interest for various astrophysical scenarios, such as AGB stars. A combined effort at the Laboratory for Underground Nuclear Astrophysics (LUNA) and the Nuclear Science Laboratory (NSL) at the University of Notre Dame aims at a cross section determination for the this reaction, to constrain the astrophysical reaction rate by improving the knowledge of the resonance strengths and the non-resonant component. Experiments at LUNA benefit from the underground location at the Gran Sasso National Laboratory which allows for the measurement of resonances at low energies with high sensitivity in a low background environment. Measurements at the University of Notre Dame pursue a determination of the non-resonant cross section at higher energies. We present the two experiments and the status of the data analysis
Exploring Stars in Underground Laboratories: Challenges and Solutions
Get PDFFor millennia, mankind has been fascinated by the marvel of the starry night sky. Yet, a proper scientific understanding of how stars form, shine, and die is a relatively recent achievement, made possible by the interplay of different disciplines as well as by significant technological, theoretical, and observational progress. We now know that stars are sustained by nuclear fusion reactions and are the furnaces where all chemical elements continue to be forged out of primordial hydrogen and helium. Studying these reactions in terrestrial laboratories presents serious challenges and often requires developing ingenious instrumentation and detection techniques. Here, we reveal how some of the major breakthroughs in our quest to unveil the inner workings of stars have come from the most unexpected of places: deep underground. As we celebrate 30 years of activity at the first underground laboratory for nuclear astrophysics, LUNA, we review some of the key milestones and anticipate future opportunities for further advances both at LUNA and at other underground laboratories worldwide
The glyoxalase system as an example of a cellular maintenance pathway with relevance to aging
No full textCommentary on: Scheckhuber CQ et al. Modulation of the glyoxalase system in the aging model Podospora anserina: effects on growth and lifespan. Aging. 2010; 2:969-980
A categoria reconhecimento na teoria de Axel Honneth
Get PDFARAÚJO NETO, José Aldo Camurça de. A categoria reconhecimento na teoria de Axel Honneth. Argumentos, Fortaleza, v. 3, n. 5, p. 139-147, 2011.This article analyzes the category in recognition of Axel Honneth theory. To this end, the author
uses written juveniles of Hegel in Jena. During this period, Hegel develops a theory of
intersubjectivity that encourages the development of term recognition as a backdrop where
conflicts. This context, that Axel Honneth develops its critical theory in his struggle for Recognition.O presente artigo tem como objetivo analisar a categoria reconhecimento na teoria de Axel
Honneth. Para tanto, o autor recorre aos escritos juvenis de Hegel no período de Jena. Neste
período, Hegel desenvolve uma teoria da intersubjetividade que propicia a elaboração do
termo reconhecimento como um pano de fundo onde se dão os conflitos. É neste contexto
que Axel Honneth desenvolve sua teoria crítica em sua obra Luta por Reconhecimento
A LIBERDADE REFLEXIVA SEGUNDO AXEL HONNETH / REFLECTIVE FREEDOM ACCORDING TO AXEL HONNETH
Get PDFO presente artigo dedica-se ao estudo do modelo de liberdade reflexiva segundo o pensamento de Axel Honneth, exposto no capítulo A.II (A Liberdade Reflexiva e sua Concepção de Justiça) da obra Direito da Liberdade, realizado através do método hipotético-dedutivo e da técnica de pesquisa bibliográfica, a fim de verificar porque a reflexão do indivíduo realizada sobre os seus próprios atos e guiada apenas por suas intenções não representa o modelo orientador da concepção de justiça proposto pelo autor.The present article intends to study the model of reflective freedom according to the thought of Axel Honneth, exposed in chapter A.II (The Reflective Freedom and its Conception of Justice) of the work Law of Freedom, realized through the hypothetic-deductive method and the bibliographical technique research, in order to verify why the individual reflection carried out on his own acts and guided only by his intentions does not represent the guiding model of the conception of justice proposed by the author
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