Teaching styles and achievement: student and teacher perspectives

Using data from a Spanish assessment program of fourth-grade pupils, we analyze to what extent using certain teaching practices and materials in class is related to achieve- ment in maths and reading. We distinguish using traditional and modern teaching styles. As a novelty, we measure in-class work using two di erent sources of information -teacher and students. Our identi cation strategy relies on between-class within-school variation of teaching styles. We nd that modern practices are related to better achievement, specially in reading, while traditional practices, if anything, are detrimental. There are di erences depending on the source of information: the magnitude of coe cients is larger when practices are reported by students. These ndings are robust to considering al- ternative de nitions of teaching practices. We obtain heterogeneous e ects of teaching styles by gender and type of school but only when using students' answers. Our nd- ings highlight the importance of the source of information, teacher or students, to draw adequate conclusions about the e ect of teaching style on achievement

Moduli Spaces of Semistable Sheaves on Singular Genus One Curves

We find some equivalences of the derived category of coherent sheaves on a Gorenstein genus one curve that preserve the (semi)-stability of pure dimensional sheaves. Using them we establish new identifications between certain Simpson moduli spaces of semistable sheaves on the curve. For rank zero, the moduli spaces are symmetric powers of the curve whilst for a fixed positive rank there are only a finite number of non-isomorphic spaces. We prove similar results for the relative semistable moduli spaces on an arbitrary genus one fibration with no conditions either on the base or on the total space. For a cycle $E_N$ of projective lines, we show that the unique degree 0 stable sheaves are the line bundles having degree 0 on every irreducible component and the sheaves $\mathcal{O}(-1)$ supported on one irreducible component. We also prove that the connected component of the moduli space that contains vector bundles of rank $r$ is isomorphic to the $r$-th symmetric product of the rational curve with one node.Comment: 26 pages, 4 figures. Added the structure of the biggest component of the moduli space of sheaves of degree 0 on a cycle of projective lines. Final version; to appear en IMRS (International Mathematics Research Notices 2009

Evaluación de la producción de biogás a partir del buchón de agua mediante codigestión anaerobia con estiércol bovino

En esta investigación se llevó a cabo el montaje a escala laboratorio para la evaluación de la producción de biogás a partir del buchón de agua en codigestión anaerobia con estiércol bovino -- Durante el desarrollo experimental se realizaron mediciones antes y después del periodo de codigestión de las variables como sólidos totales, sólidos volátiles y pH; con el fin de establecer el desempeño del proceso -- Los ensayos de biodegradabilidad anaerobia a escala laboratorio se llevaron a cabo con sustratos húmedos en 32 reactores (incluyendo réplica) de 250 ml durante 22 días, incubados a 35 ± 1°C, con agitación intermitente -- Se evaluaron RI-S de 3:1, 2:1, 1:1 y 0,5:1; en las cuales se mantuvo constante una concentración de inóculo de 10 g SV/L; con una mezcla de cantidades de sustrato - cosustrato de 0, 33, 66, 100 % de buchón de agua, determinadas mediante un diseño de experimentos factorial completo 4 X 4 -- La medición de la producción de biogás se realizó diariamente mediante el método volumétrico, obteniendo un volumen máximo de biogás acumulado a partir de la RI-S 0,5,*100 de 823 ml de biogás -- Por su parte, el más alto rendimiento de biogás correspondió a la RI-S 3*100 con un valor de 539,46 (mlbiogás/ g SV), en la que se determinó un 29% de remoción de sólidos volátiles y un valor en el pH de 7,4 y 8,91 inicial y final respectivamente -- Con la que se realiza el diseño conceptual del proceso a escala piloto con una capacidad de 150 L, para cubrir una demanda de 2500 L de biogás anuales; sin embargo el análisis financiero determinó que el proceso no era viable económicamente al presentar, a una proyección de 12 años, un VPN de $ -205.728.895,9

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In Ciudad Juárez, as in the rest of Mexico, children with intellectual disabilities face innumerable systemic barriers, some of them at the educational level. Given that a prevailing culture of machismo shapes gender expectations in this country, it is usually the mothers who assume the responsibility of finding and navigating the scarce services available to their children with disabilities. Through testimonio methodology, this qualitative study explores the intersections of gender, motherhood, border, socioeconomic class, marital status and disability of children. This work portrays the testimonios of three single mothers, who share their experiences regarding the measures they have had to take in order to bridge the educational gaps that their children have faced across educational settings.En Ciudad Juárez, como en el resto de México, l@s niñ@s con discapacidad intelectual se enfrentan a innumerables barreras sistémicas, algunas de estas a nivel educativo. Dado que una cultura predominante de machismo moldea las expectativas de género en este país, usualmente son las madres de familia quienes asumen la responsabilidad de encontrar y navegar los escasos servicios disponibles para sus hij@s con discapacidad. A través de la metodología de testimonio, este estudio cualitativo explora las intersecciones de género, maternidad, frontera, estatus socioeconómico, estado marital y discapacidad de l@s hij@s. El presente trabajo retrata los testimonios de tres madres solteras, quienes comparten sus vivencias en cuanto a las medidas que han tenido que tomar con el propósito de cerrar las brechas educativas a las que se han enfrentado sus hijos en distintos ambientes educativos

Synthesis and study of biological activity of tetrahydro-1H-[3]-benzazepines

The 3-Benzazepines are an important class of compounds in drug discovery due to their biological activity such as analgesic, antihypertensive or anticancer properties as well as dopaminergic or antidopaminergic activity. In particular, the tetrahydro-1H-[3]- benzazepine is a common skeleton in a number of natural and pharmaceutical products. As consequence of the interesting biological properties, derivatives of the tetrahydro-1H-[3]-benzazepines, especially the 1-aryl substituted have been synthesized by different routes and evaluated their pharmacologic activity. [1,2] The stereoselective synthetic approaches of tetrahydro-1H-[3]-benzazepine have focused on ring enlargements, as the Stevens rearrangement (SR) which is a good regio- and diastereoselective synthetic methodology. In my research group, the reaction conditions to synthesize tetrahydro-1H-[3]-benzazepines 1,2-disubstituted by via SR from tetrahydroisoquinolinium salts conveniently functionalized have been optimized. [3,4] This methodology allowed us to obtain a wide variety of tetrahydro-1H-[3]- benzazepines 1,2-disubstituted with different substituents at A-ring (Cl, OMe) and the C-1 (-C6H4X, X = H, OMe, Cl, NO2, NMe2, NH2, SMe) and C-2 (Electron-withdrawing groups) positions. The demethylation of the synthesized tetrahydroisoquinolines and tetrahydro-1H-[3]-benzazepines 1,2-disubstituted, lead us to get catechol structure, an important requirement for their dopaminergic activity. We have studied the dopaminergic activity of the synthesized compounds by radioligand binding assays, establishing a structure-activity relationships. Literature: [1] A. Gini, Adv. Synth. Catal. 2016, 358, 4049. [2] H. Damsen, Eur. J. Org. Chem. 2015, 36, 7880. [3] M. Valpuesta, Eur. J. Org. Chem. 2010, 23, 4393. [4] M. Ariza, Eur. J. Org. Chem. 2011, 32, 6507.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Análisis de la legislación que regula la Distribución de los Bienes Comunales a causa del Divorcio en Nicaragua

El divorcio es un tema muy polémico puesto que tras intentar disolver el vímatrimonial existente entre los cónyuges, acarrea consigo efectos jurídicos que afectan a terceros, por lo cual es importante realizar un estudio minucioso y exhaustivo de l os efectos que surge a raíz de este . Esta investigación tiene como finalidad realizar un análisis sobre los tipos de regímenes matrimoniales en la disolución del vínculo matrimonial, por lo que se utilizó el método cualitativo, análisis, recolección de datos teóricos y prácticos a través de textos, sitios web, trabajos monográficos, expedientes logrando desarrollar tres capítulos que tratan respectivamente sobre generalidades de la disolución del vínculo matrimonial, regímenes matrimoniales y legislación que regula esta materia. Siendo necesario analizar el tipo de régimen económico que los cónyuges deciden constituir, y poder encontrar de esta forma cual sería el beneficio que se obtendría de cada régimen para los esposos que decidan poner fin a su relación conyugal y por consiguiente darnos cuenta si ambos adquieren igualdad de derechos como resultado de la disolución del vínculo matrimonial. En conclusión se considera que Nicaragua debe recoger en un sola norma todo lo relacionado a los regímenes económicos matrimoniales enfocada a garantizar una efectiva y justa liquidación del régimen que los cónyuges hayan estipulado al celebrar capitulaciones matrimoniales antes o durante su matrimonio con la finalidad de que exista una igualdad de derechos ante la ley una vez que se decida romper con su lazo conyugal

Myocardial trabeculation in embryos of Scyliorhinus canicula (Elasmobranchii, Chondrichthyans)

Currently, three types of ventricular myoarchitecture are recognized in vertebrates, namely compact, spongy (trabeculated) and mixed myocardium. Mixed myocardium, which has been recently proposed as the primitive condition in gnathostomes, is composed of two myocardial layers: an inner trabeculated and an outer compact one. The trabeculation process has been studied in teleosts, showing exclusively spongy myocardium, and mammals and birds, characterized by a compact myocardial ventricular wall. In zebrafish, mouse and chicken embryos, the trabeculae develop as luminal myocardial ridges protruding into the lumen. In mammals and birds, further compactation of trabeculae leads to the formation of a compact layer. The potential mechanisms that may contribute to the formation of the ridges are under discussion and include myocardial proliferation, endocardial invagination, and bending of the entire myocardial layer. However, no description of the development of the mixed myocardium is available. To shed some light on this issue, we have studied the heart development of an elasmobranch species with mixed myocardium, the lesser spotted dogfish (Scyliorhinus canicula; Chondrichthyes), by means of histological and immunohistochemical techniques for light microscopy, semithin sections, scanning electron microscopy and transmission electron microscopy. Our results suggest that in the dogfish the intertrabecular spaces develop by connections between early intramyocardial spaces and the lumen of the ventricle through invaginations of the endocardial line. Chondrichthyans are the earliest diverged lineage of gnathostomes and, consequently, they have the most primitive cardiac design. Although chicken, mouse, and recently zebrafish have been considered powerful vertebrate models to study heart development, we propose that the trabeculation process in the dogfish is representative of the early steps of the ventricular morphogenesis in vertebrates.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.Study supported by grant CGL2017-85090-P and CGL2014-52356-P (Ministerio de Economía y Competitividad), FPU15/03209 (Ministerio de Educación, Cultura y Deporte), FEDER, and Universidad de Málaga