Rutas argentinas

El objetivo de esta colección es favorecer el aprendizaje en las áreas de Matemáticas, Lengua, Ciencias Sociales y Ciencias Naturales. Los materiales fueron ilustrados por artistas de primer nivel como Rep, Istvansch, Isol, Claudia Legnazzi, Bianki y Bernasconi

The Danish political twin study:Political traits in Danish twins and the general population

We compare a recent Danish twin survey on political attitudes and behaviors to a nationally representative survey covering similar topics. We find very similar means and variances for most of our constructed scales of political attitudes and behaviors in the two surveys, although even small differences tend to be statistically significant due to sample size. This suggests that the twin study can be used to make inferences on the heritability of several political traits in the Danish population.</jats:p

Strong diamagnetic response and specific heat anomaly above T_c in underdoped La_(2-x)Sr_xCuO_4

By measuring AC susceptibility using a very low amplitude of the AC field (<1 mG) it is shown that underdoped samples of La_(2-x)Sr_xCuO_4 (LASCO), are diamagnetic in a temperature region above T_c up to a temperature T^*. This behavior is only observed with AC fields along the c-axis whereas for fields in the ab-plane no diamagnetism above Tc was detected. The diamagnetism is almost frequency independent in the frequency range 0.1-10 kHz. At T* a broad step anomaly in the specific heat is inferred through measurements of the elastic constant c33. We suggest that the observed diamagnetism and the anomaly in the elastic constant are associated with the existence of phase incoherent Cooper pairs between Tc and T*.Comment: 5 pages 7 figures, to appear in Phys. rev

La redefinición del campo pedagógico : Una perspectiva en relación a sus problemas contemporáneos

Nos proponemos en este resumen dar cuenta de los debates que el Colectivo Docente Educación II viene realizando - a través de diversas actividades - de la configuración del campo pedagógico y de los problemas más relevantes para la formación de los estudiantes de grado en la Carrera de Ciencias de la Educación. Realizaremos una breve enunciación de aquellos que - geopolíticamente y en la actualidad - se nos presentan como más significativos. Los debates teóricos y epistemológicos que fundamentan el recorte realizado serán incluidos en la ponencia correspondiente. El problema del poder, el cambio y la permanencia en los procesos, prácticas, instituciones y sujetos pedagógicos. Las transformaciones sociales, económicas, políticas, culturales y tecnológicas y los cambios en la educación. Las discusiones en torno de las reformas educativas y las innovaciones pedagógicas, la gramática/cultura escolar, las formas de lo escolar, el "programa institucional" como analizadores de las mismas. Los sistemas educativos como construcciones sociales e históricas, como organizaciones complejas, y como institucionalización de prácticas pedagógicas. Continuidades y rupturas en los procesos de emergencia, consolidación y crisis de los sistemas escolares y de los procesos educativos en diversos contextos sociales y pedagógicos. El problema de la desigualdad educativa y los sujetos de la educación. Aproximaciones clásicas y contemporáneas. Del discurso de la igualdad al discurso de la equidad y los debates contemporáneos en torno al discurso de la igualdad. Del problema de la desigualdad al reconocimiento de las diferencias y las identidades: universalismo, particularismo e identidades sociales. Las reformulaciones en torno del problema de la inclusión y la exclusión educativas. La fragmentación de los sistemas escolares y la diversificación de procesos pedagógicos en múltiples contextos de aprendizaje. Los "nuevos" sujetos sociales y educativos y las tensiones en el campo pedagógico: las nuevas infancias, adolescencias y juventudes; la emergencia de movimientos sociales y territoriales en el campo de la educación popular; los movimientos pedagógicos, las redes escolares y las nuevas formas de organización colectiva de docentes. El problema de la transmisión cultural y de los saberes escolares. Aproximaciones clásicas: los sistemas educativos, la transmisión cultural y el currículum como campo de lucha y de construcción hegemónica. Aproximaciones contemporáneas: el "giro cultural" y las redefiniciones epistemológicas y ontológicas de los saberes y el conocimiento. Los docentes: la transmisión cultural y la creación/recreación de los saberes pedagógicos. Del discurso de la homogeneidad universalista al reconocimiento del otro y de la diversidad: el problema del etnocentrismo en educación. La colonialidad del saber, el poder y nuevos problemas pedagógicosFil: Caride, Lucia. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.Fil: Thisted, Sofía. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.Fil: Vassiliades, Alejandro. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina

“Særlig dansk” - Dansk litteraturs kanon i et minoritetsperspektiv

The Danish Literary Canon (Dansk litteraturs kanon) implicitly addresses pupils of non-Danish origin. The purpose of the canon is to suggest pedagogical tools in the teachings of specific texts that are viewed as central to the Danish and European literary tradition. The consequences of this project are not only that pupils of non-Danish origin become situated as ‘others’ in relation to the idea of ‘danishness’, but that this implicit constitution of ‘same’ and ‘difference’ naturalises Dansih national identity. From a minority studies point of view the pedagogical purpose should be to ask: How to teach Danish literature and with what purpose, and thus, not take what Danish literature is for granted

“Særlig dansk” - Dansk litteraturs kanon i et minoritetsperspektiv

The Danish Literary Canon (Dansk litteraturs kanon) implicitly addresses pupils of non-Danish origin. The purpose of the canon is to suggest pedagogical tools in the teachings of specific texts that are viewed as central to the Danish and European literary tradition. The consequences of this project are not only that pupils of non-Danish origin become situated as ‘others’ in relation to the idea of ‘danishness’, but that this implicit constitution of ‘same’ and ‘difference’ naturalises Dansih national identity. From a minority studies point of view the pedagogical purpose should be to ask: How to teach Danish literature and with what purpose, and thus, not take what Danish literature is for granted

Information Content in B→VVB \to VV Decays and the Angular Moments Method

The time-dependent angular distributions of decays of neutral $B$ mesons into two vector mesons contain information about the lifetimes, mass differences, strong and weak phases, form factors, and CP violating quantities. A statistical analysis of the information content is performed by giving the ``information'' a quantitative meaning. It is shown that for some parameters of interest, the information content in time and angular measurements combined may be orders of magnitude more than the information from time measurements alone and hence the angular measurements are highly recommended. The method of angular moments is compared with the (maximum) likelihood method to find that it works almost as well in the region of interest for the one-angle distribution. For the complete three-angle distribution, an estimate of possible statistical errors expected on the observables of interest is obtained. It indicates that the three-angle distribution, unraveled by the method of angular moments, would be able to nail down many quantities of interest and will help in pointing unambiguously to new physics.Comment: LaTeX, 34 pages with 9 figure

Electrochemical properties of phosphorus compounds in fluoride melts

In the present work the behaviour of phosphorus species in fluoride-based melts was investigated. The motivation for the study was based on the deleterious effect of phosphorus on the aluminium production process. It is “known” that for each 100 ppm phosphorus (P) in the bath the current efficiency is reduced by 1%. In addition, the properties of cast alloys are influenced by the phosphorus content. The thesis contains a literature review on the chemistry of phosphorus with focus on its behaviour in molten salts. The solubility of aluminium orthophosphate in cryolite melt was studied. Part of the phase diagram of the system Na3AlF6-AlPO4 was investigated. The eutectic point was determined to be at (57.21 ± 0.02) mole% AlPO4 and (695.9 ± 1.0) ºC. It was found that the orthophosphate dissociates partly into a metaphosphate species and an oxide ion in pure cryolite melts: PO 43- PO3 – + O2- Electrochemical measurements were performed in the systems Na3AlF6- AlPO4, Na3AlF6-Al2O3-AlPO4, Na3AlF6-Al2O3-Na3PO4 and NaF-Na3PO4. By means of cyclic voltammetry, chronoamperometry, chronopotentiometry and square wave voltammetry the behaviour of the P(V) species were studied. The most suitable electrode materials were found to be tungsten and copper. With a tungsten working electrode the number of electrons transferred when reducing P(V) in an alumina-saturated cryolite melt was found to be two. The diffusion coefficient for the PO4 3- added as Na3PO4 at 1000 ºC was calculated to be (9.2 ± 1.0)·10-6 cm2/s with cyclic voltammetry and (6.8 ± 0.7)·10-6 cm2/s with chronopotentiometry. When adding AlPO4 the diffusion coefficients of the P(V) species at 1000 ºC seem to vary from 1.2·10-5 to 2.1·10-5 cm2/s for cyclic voltammetry, while for chronopotentiometry and chronoamperometry the values were between 1.9·10-5 and 2.5·10-5 cm2/s. The reduced phosphorus species seemed to adhere on the tungsten working electrode. In the pure cryolite system the reduction of P(V) on a copper electrode at 1020 ºC seemed to involve three electrons. However, the number of electrons transferred when using the tungsten electrode at 1020 ºC was found to be 2 as for the alumina-saturated system. For both electrode materials the system under study was found to be soluble-soluble. The diffusion coefficients for the P(V) species determined with the copper electrode was found to be between 1.6·10-5 and 1.8·10-5 cm2/s. In the case of the tungsten working electrode, they were found to be about 1.9·10-5 to 2.2·10-5 cm2/s. At low contents of aluminium orthophosphate in pure molten cryolite, two peak couples were observed. Two possible mechanisms were proposed. One of them included reduction of P(V) to P(III) and further to P(I), while in the other the reduction of two different P(V) species (PO4 3- and PO3 -) to P(III) species was suggested. Since the deposition of aluminium might hide further reduction steps of phosphorus, electrochemical studies in the pure sodium fluoride system with addition of Na3PO4 were performed at 1002 ºC and 1005 ºC with a tungsten working electrode. The investigation indicated that the orthophosphate ion dissociates into an oxide ion and a phosphorus containing species. The number of electrons transferred when reducing the phosphorus compounds was determined to be 2. The oxide ion seemed to oxidize the tungsten working electrode forming tungsten oxide compounds. The number of electrons transferred in this reaction was found to be 1. The diffusion coefficient of the O2- species was determined to be between and 3.2·10-5 to 7.4·10-5 cm2/s.dr.ing.dr.ing

A nationwide outbreak of listeriosis associated with cold-cuts, Sweden 2013-2014

In January 2014, the Public Health Agency of Sweden noticed an increase in listeriosis cases. Isolates from 10 cases had identical pulsed field gel electrophoresis (PFGE) profiles, suggesting a common source. We investigated the outbreak to identify the source and stop transmission. We looked for cases in 2013–2014 and also compared cases notified after February 2014 to randomly selected controls. We surveyed food items consumed two weeks prior to symptom onset. Listeria monocytogenes isolates found by food producers were PFGE-typed. Patient and food isolates with the outbreak PFGE profile were whole-genome sequenced and 51 cases with identical PFGE profile were identified; 12/20 cases and 108/186 controls responded to the survey. All cases were exposed to cold-cuts, compared with 72% of controls (p = 0.034). Five isolates of L. monocytogenes with the outbreak PFGE profile were found in cold-cuts from a food producer which stopped production in February 2014, but cases appeared until October 2014. Whole-genome sequencing showed that cold-cut and patient isolates differed by eight single nucleotide polymorphisms. Three patient isolates differed more and were probably not part of the outbreak. Epidemiological and microbiological results indicated cold-cuts as a possible source of the outbreak