Convolutional Goppa Codes

We define Convolutional Goppa Codes over algebraic curves and construct their corresponding dual codes. Examples over the projective line and over elliptic curves are described, obtaining in particular some Maximum-Distance Separable (MDS) convolutional codes.Comment: 8 pages, submitted to IEEE Trans. Inform. Theor

Synthesis, characterization of a new carbonylated zirconium metallocene using a dichloro-zirconocene derived from partially alkylated s-indacene

Indexación: ScieloThis work describes the synthesis and characterization of new organometallic species, an unprecedented mononuclear zirconium complex bearing a tetraalkylated s-indacene ligand, and secondly, its respective dicarbonyl complex obtained by reduction with Mg/HgCl2. Theoretical calculations of these two compounds were carried out to gain further understanding of these novel molecular systems.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000300014&lng=es&nrm=is

Hysteroscopic Management of an Interstitial Ectopic Pregnancy

We report a case of an interstitial ectopic pregnancy successfully managed by hysteroscopy. We highlight the benefits of using hysteroscopy, a non-invasive procedure, to preserve fertility

Analysis of performance parameters of the smash in male and female professional padel

The aim of this study was to analyze the distribution and effectiveness of the different types of smash in professional padel according to the area and direction of the strokes and the gender. Through systematic observation, 1.015 smashes from eight finals (four men’s and four women’s) of the professional matches were analyzed. The smashes were categorized into four types of smash: tray, flat, topspin and off the wall. The results showed both men’s and women’s that the tray is the most used smash by padel players, presenting a percentage of point continuity of almost 90%. The flat and topspin smashes are the strokes that achieve the highest percentage of winning points (near 60%), although this efficiency decreases significantly when the players move away from the net area (p < 0.05), especially in the flat smash. Men perform a higher percentage of winning smashes than women, mainly in the flat smash (p = 0.02). Furthermore, with regards to direction, flat and off the wall smashes are predominantly down the line strokes and women perform significantly more cross court topspin smashes than men (p = 0.005). The results shown could be used to design tasks and exercises by padel coaches at professional players

Checklist of the centipedes (Chilopoda) of Hispaniola

Ten years have passed since the last checklist of Hispaniolan Chilopoda was done and the last bibliographic compendium was published. In this work we expand the former list of species and bibliography, update the taxonomic classification and provide an assessment on Chilobase records. A new intensive literature review was performed and both recent and formerly overlooked myriapodological works were included. The treatment of supraspecific taxonomic ranks was updated and follows Chilobase 2.0. This catalogue lists 4 fossil taxa as well as 24 extant species of centipedes from Hispaniola, 9 of which are endemic. For each extant species considered, there is information on Hispaniolan synonymies and geographic distribution. Included are some clarifications on synonymies and locality problems, and species with uncertain taxonomic status are indicated. Chilobase 2.0 was tested for completeness and accuracy. We propose several updates, grouped by incorrect species records, records not  backed by known literature and species not under their currently accepted synonym. We also recommend chilopodologists to maintain active collaboration and send their updates to this useful database

SÍNTESIS Y CARACTERIZACIÓN DE COMPUESTOS DE COORDINACIÓN: UNA

El presente trabajo muestra los resultados exitosos en el desarrollo de un curso de laboratorio de química inorgánica mediante la implementación del modelo de Aprendizaje por Investigación, como una estrategia integradora de conocimientos que permite a los estudiantes el desarrollo de competencias de reconocimiento, interpretación y producción relacionadas con los procesos de síntesis de compuestos de coordinación de interés en el área de la química inorgánica. El desarrollo riguroso de la metodología científica condujo a la comprensión y aplicación de las teorías de enlace de valencia y orbital molecular, la teoría de coordinación de Werner y la teoría de campo cristalino; como también principios de simetría, teoría de grupos y espectroscopía infrarroja, IR

Checklist of the centipedes (Chilopoda) of Hispaniola

Ten years have passed since the last checklist of Hispaniolan Chilopoda was done and the last bibliographic compendium was published. In this work we expand the former list of species and bibliography, update the taxonomic classification and provide an assessment on Chilobase records. A new intensive literature review was performed and both recent and formerly overlooked myriapodological works were included. The treatment of supraspecific taxonomic ranks was updated and follows Chilobase 2.0. This catalogue lists 4 fossil taxa as well as 24 extant species of centipedes from Hispaniola, 9 of which are endemic. For each extant species considered, there is information on Hispaniolan synonymies and geographic distribution. Included are some clarifications on synonymies and locality problems, and species with uncertain taxonomic status are indicated. Chilobase 2.0 was tested for completeness and accuracy. We propose several updates, grouped by incorrect species records, records not backed by known literature and species not under their currently accepted synonym. We also recommend chilopodologists to maintain active collaboration and send their updates to this useful database.</p

An in-depth view of the microscopic dynamics of Ising spin glasses at fixed temperature

Using the dedicated computer Janus, we follow the nonequilibrium dynamics of the Ising spin glass in three dimensions for eleven orders of magnitude. The use of integral estimators for the coherence and correlation lengths allows us to study dynamic heterogeneities and the presence of a replicon mode and to obtain safe bounds on the Edwards-Anderson order parameter below the critical temperature. We obtain good agreement with experimental determinations of the temperature-dependent decay exponents for the thermoremanent magnetization. This magnitude is observed to scale with the much harder to measure coherence length, a potentially useful result for experimentalists. The exponents for energy relaxation display a linear dependence on temperature and reasonable extrapolations to the critical point. We conclude examining the time growth of the coherence length, with a comparison of critical and activated dynamics.Comment: 38 pages, 26 figure

Natural Sources of Spraying to Preserve Apple Fruit Quality during Post-Harvest

One of the great challenges that apple producers face is to substantially improve the quality of fruit, including after harvest. A balanced and timely supply of calcium (Ca) during growth and in the post-harvest stage is considered a technique that could improve shelf life and fruit quality; thus calcium plays a key role during post-harvest, with calcium carbonate and calcium sulphate being an alternative of foliar spraying. The study was carried out on ‘Top Red’ and ‘Golden Delicious’ apple cultivars, in a randomized complete block design with 13 treatments (referring to different commercial presentations of calcium) and 6 repetitions; 8 foliar sprays were applied weekly, from June 22 until harvest; ‘Top Red’ (151 days after full flowering, DDCF) and ‘Golden Delicious’ (145 DDCF) fruit were evaluated in regard with fruit traits (diameter, weight and colour) and maturity (pulp firmness, total soluble solids, titratable acidity and sugar acidity ratio). In ‘Top Red’ cv., calcium carbonate presented the best results, with intermediate to high quality apple fruit, while for cv. ‘Golden Delicious’ the best results were obtained with calcium sulphate, which increased fruits’ diameter, weight, colour and titratable acidity. Even more, of the products evaluated, CaCO3 and CaSO4 had the lowest costs, and can be considered as good alternatives of foliar calcium supplement applied in order to preserve the quality of the apple during post-harvest