22,415 research outputs found
An algebraic SU(1,1) solution for the relativistic hydrogen atom
The bound eigenfunctions and spectrum of a Dirac hydrogen atom are found
taking advantage of the Lie algebra in which the radial part of the
problem can be expressed. For defining the algebra we need to add to the
description an additional angular variable playing essentially the role of a
phase. The operators spanning the algebra are used for defining ladder
operators for the radial eigenfunctions of the relativistic hydrogen atom and
for evaluating its energy spectrum. The status of the Johnson-Lippman operator
in this algebra is also investigated.Comment: to appear in Physics Letters A (2005). We corrected a misprint in
page 7, in the paragraph baggining with "With the value of ..." the ground
state should be |\lambda, \lambda>, not |\lambda, \lambda+1
Ley penal mexicana y vÃctimas colaterales
[ES] Este artÃculo demuestra la necesidad de una nueva teorÃa de la argumentación jurÃdica en materia penal. Reseña la historia del Código Penal Federal mexicano. Hace la diferencia entre ciencia jurÃdica y ley penal. A la ciencia jurÃdico-penal no se le puede observar sólo como argumentación, sino que es necesario juzgar y argumentar otorgando más importancia a la interpretación crÃtica a la luz de la moderna hermenéutica.[EU] Artikulu honek zigor-arloan argudio jurdiko berri baten beharra azaltzen du. Mexikar Zigor-Kode Federalaren historioa azaltzen du. Lege Penala eta Zientzia Juridikoaren arteko desbertintasuna egiten du. Zientzia Jurdiko eta Penala ezin daiteke argudio bezala soilik aztertu, baizik eta egungo hermeneutika kontuan harturik, beharrezkoa da epaitu eta argudiatu interpretazio kritikoari garrantzi handiagoa emanez.[FR] Cet article montre la nécessité d’une nouvelle théorie de l’argumentation juridique en matière pénale. L’auteur raconte l’histoire du Code Pénal Fédéral mexicain, en faisant la différence entre la science juridique et la Loi pénale. Il ne faut pas observer la science juridique pénale seulement comme une argumentation, mais il est nécessaire de juger et d’argumenter en attribuant plus d’importance à l’interprétation critique d’après le point de vue de la herméneutique moderne.[EN] This article shows the need for a new theory of juridical argumentation in criminal matters. It gives an account on the history of the Mexican Federal Penal Code. It also differentiates juridical science from criminal law. Criminal science cannot be seen only as argumentation, it is necessary to judge and argue giving more importance to the critical interpretation in the light of modern hermeneutics
Derechos humanos y juicios orales. Yuxtaposición del proceso penal y una sociedad perversa
[ES] Ante un problema pragmático –transformar el proceso penal moderno en proceso restaurativo–, el presente artÃculo aborda un problema cognitivo, ¿Cómo formar conciencia entre los habitantes de México de que los juicios orales necesitan avanzar en el sentido de los Derechos Humanos? Dicha aporÃa se origina con la Reforma a la Constitución PolÃtica de México, en materia de Justicia Penal, Seguridad Pública y Delincuencia Organizada, promulgada el 18 de junio de 2008, la cual junta el proceso penal moderno y una sociedad perversa.[EU] Arazo pragmatiko baten aurrean –prozesu penal modernoa prozesu berrezartzaile bihurtzea–, egileak honako arazo kognitibo honi heltzen dio: nola sortu kontzientzia Mexikoko biztanleen artean ahozko epaiketak giza eskubideen alorrean aurrera jotzeko beharraz? Aporia horrek Justizia Penalaren, Segurtasun Publikoaren eta Delinkuentzia Antolatuaren arloan egindako Mexikoko Konstituzio Politikoaren Erreforman du jatorria, zeina 2008ko ekainaren 28an promulgatu zuten, eta prozesu penal modernoa eta gizarte makur bat elkartzen ditu.[FR] Devant un problème pragmatique –transformation du procès pénal moderne en procès restauratif–, l’article traite d’un problème cognitif: comment développer la conscience entre la population du Mexique en ce qui concerne la nécessité d’avancer en matière des droits de l’homme au sein des audiences? Cette aporie trouve son origine dans la Réforme de la Constitution Politique du Mexique, en matière de Justice Pénale, Sécurité Publique et Délinquance Organisée, promulguée le 18 juin 2008, laquelle met en rapport le procès pénal moderne avec une société perverse.[EN] Faced with a pragmatic problem –transforming the modern criminal justice process into a restorative process–, the present article deals with a cognitive problem: how can we raise awareness among Mexico’s inhabitants about the need for oral trials to develop towards Human Rights? Such an aporia originates from the Reform of the Political Constitution of Mexico, in terms of Criminal Justice, Public Security and Organized Crime, enacted on June 18, 2008, which puts together the modern criminal justice process and a perverse society
Pedagogy in diverse secondary school classes: Legacies for higher education
As university teachers we find ourselves grappling with the increasingly diverse
legacies of students’ prior pedagogic experiences – some of which seem to work against
the quality intellectual outcomes now demanded from higher education. In this context,
this paper reports a descriptive study of pedagogy created for Chinese students in a
mainstream Australian secondary school with a high level of tertiary entry. An
influential literature on student learning in higher education has pointed to the
constraining effects of bothWestern and Chinese secondary schooling on university
students’ learning. In the case of Chinese students who enter Western universities from
Western secondary schools, the picture is complicated by research indicating that
students of English as a Second Language (ESL) receive even more constraining forms
of pedagogy than their native-English-speaking peers. A framework of Bernsteinian
sociological concepts and discourse analytic concepts was employed in the study
reported here to explore this possibility. Implications are drawn for managing the
transition of ESL students to university contexts, and for reflecting on our own
responses to linguistic and cultural diversity in the tutorial room
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Anaerobic 4-hydroxyproline utilization: Discovery of a new glycyl radical enzyme in the human gut microbiome uncovers a widespread microbial metabolic activity.
The discovery of enzymes responsible for previously unappreciated microbial metabolic pathways furthers our understanding of host-microbe and microbe-microbe interactions. We recently identified and characterized a new gut microbial glycyl radical enzyme (GRE) responsible for anaerobic metabolism of trans-4-hydroxy-l-proline (Hyp). Hyp dehydratase (HypD) catalyzes the removal of water from Hyp to generate Δ1-pyrroline-5-carboxylate (P5C). This enzyme is encoded in the genomes of a diverse set of gut anaerobes and is prevalent and abundant in healthy human stool metagenomes. Here, we discuss the roles HypD may play in different microbial metabolic pathways as well as the potential implications of this activity for colonization resistance and pathogenesis within the human gut. Finally, we present evidence of anaerobic Hyp metabolism in sediments through enrichment culturing of Hyp-degrading bacteria, highlighting the wide distribution of this pathway in anoxic environments beyond the human gut
Fibrosis intersticial pulmonar idiopática en el West Highland White Terrier
El siguiente trabajo revisa las caracterÃsticas clÃnicas y el protocolo diagnóstico de la fibrosis intersticial pulmonar idiopática en el West Highland White Terrier. A su vez, se ofrece una revisión de los trabajos publicados sobre esta frustrante enfermedad de etiologÃa desconocida. Finalmente, se revisan las opciones terapéuticas y el pronóstico de la enfermedad
The Exemption Status of the Bona Fide Pledgee of Unregistered Securities Under the Securities Act of 1933
The number of connections of photovoltaic (PV) to distribution network is increasing. Very few PV connection guidelines that distribution system operators (DSOs) can refer to have been found. This paper deals with network planning guidelines for distribution networks with PV. The paper aims to identify planning rules that are relatively easy to implement.QC 20140625</p
Existence and Uniqueness of Solutions to a Nonlocal Equation with Monostable Nonlinearity
Let , , \int_{\tiny\mathbb{R}} J = 1 and
consider the nonlocal diffusion operator . We
study the equation , , in ,
where is a KPP-type nonlinearity, periodic in . We show that the
principal eigenvalue of the linearization around zero is well defined and that
a nontrivial solution of the nonlinear problem exists if and only if this
eigenvalue is negative. We prove that if, additionally, is symmetric, then
the nontrivial solution is unique
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