La Enseñanza del Algebra y la Reprobación. Una Experiencia para Compartir

This paper is the result of an applied research conducted at two middle schools in Xalapa (Mexico) whose purpose was to decrease the failure rate of a second grade math course, by means of a didactic proposal based on new information and communication technologies(ICT), and an eclectic constructivist approach; sensible to the set objectives. Given the scope of this research, in this paper, we narrate one of the experiences we went through in a classroom where the proposal was carried out at the middle school Julio Zárate. Our aim is to report the findings regarding the learning of algebra.El presente artículo es resultado de una investigación aplicada en dos escuelas secundarias; cuyo propósito fue disminuir los índices de reprobación en Matemáticas, a través del diseño e implementación de una propuesta didáctica basada en el uso de las TIC y sustentada en el constructivismo. En este texto se narra una de las experiencias vividas en un aula,  en la escuela Secundaria Julio Zárate. Se muestra cómo fueron las reacciones de los estudiantes hacia esquemas diferentes de enseñar y aprender, y cuáles fueron los resultados obtenidos concernientes al aprendizaje del álgebr

Guía Meteorológica de Aeródromo: Málaga-Costa del Sol

Documento revisado por : Jesús Riesco Martín, Carlos Perea Hitos y María Rosa Pons ReynésUna guía meteorológica de aeródromo es un informe técnico en el que se detallan todos los fenómenos meteorológicos que potencialmente son adversos para el desarrollo y regularidad de las operaciones desplegadas en un determinado aeródromo. El principal objetivo es concienciar a los usuarios aeronáuticos de los riesgos que entraña la fenomenología atmosférica, además de servir de instrumento de asesoramiento en la planificación y toma de decisiones

DCMF: DC & Microformats, a good marriage

This report introduces the Dublin Core Microformats (DCMF) project, a new way to use the DC element set within X/HTML. The DC microformats encode explicit semantic expressions in an X/HTML webpage, by using a specific list of terms for values of the attributes “rev” and “rel” for and elements, and “class” and “id” of other elements. Microformats can be easily processed by user agents and software, enabling a high level of interoperability. These characteristics are crucial for the growing number of social applications allowing users to participate in the Web 2.0 environment as information creators and consumers. This report reviews the origins of microformats; illustrates the coding of DC microformats using the Dublin Core Metadata Gen tool, and a Firefox extension for extraction and visualization; and discusses the benefits of creating Web services utilizing DC microformats

Cyclization and self-assembly of cyclic peptides

Part of the Methods in Molecular Biology book series (MIMB,volume 2371)Cyclic peptides are a fascinating class of molecules that can be programmed to fold or self-assemble into diverse mono- and multidimensional structures with potential applications in biomedicine, nanoelectronics, or catalysis. Herein we describe on-resin procedures to carry out head-to-tail peptide cyclization based on orthogonal protected linear structures. We also present essential characterization tools for obtaining dynamic and structural information, including the visualization cyclic peptide assembly into nanotubes (AFM, TEM) as well as the use of fluorescence microscopy2023-10-0

Propuesta de componentes para un sistema híbrido fotovoltaico interconectado a la red, en pozo agrícola oriental Puebla

Currently the rainy periods that satisfy the Mexican countryside lack consistency, which is a sign of the need for a backup system that allows farmers to generate electricity to support the irrigation of their crops. This is one of the advantages provided by the photovoltaic hybrid system, since in addition to generating electricity it will allow it to be stored. C.F.E. install a bidirectional meter capable of taking generation values and the surplus energy will be taken so that the electricity bill will be economical, The price of electricity in Mexico is divided into different groups of customers among which our study "The consumption of agricultural use" stands out, which is below the prices of other types of customers, The consumption of electricity in the agricultural sector worldwide represented 2.77% and nationally was 4.24%.Actualmente los periodos de lluvia que satisfacen el campo mexicano carecen de consistencia lo que es una muestra de la necesidad de un sistema de respaldo que les permita a los agricultores generar energía eléctrica para respaldar el riego de sus cultivos. Esta es una de las ventajas que aporta el sistema híbrido fotovoltaico, ya que además de generar electricidad permitirá almacenarla, C.F.E. instalará un contador bidireccional capaz de tomar valores de generación y la energía excedente se tomará de modo que la factura de luz resultará económica, el precio de la electricidad en México se divide en diferentes grupos de clientes entre los que destaca nuestro estudio “el consumo de uso agrícola” que se encuentra por debajo de los precios de los demás tipos de clientes, El consumo de energía eléctrica en el sector agropecuario a nivel mundial representó el 2.77% y a nivel nacional fue de 4.24%.  “(SENER, 2021

Bottom-up supramolecular assembly in two dimensions

This article is part of the themed collections: Most popular 2022 supramolecular chemistry articles and 2022 Chemical Science Perspective & Review CollectionThe self-assembly of molecules in two dimensions (2D) is gathering attention from all disciplines across the chemical sciences. Attracted by the interesting properties of two-dimensional inorganic analogues, monomers of different chemical natures are being explored for the assembly of dynamic 2D systems. Although many important discoveries have been already achieved, great challenges are still to be addressed in this field. Hierarchical multicomponent assembly, directional non-covalent growth and internal structural control are a just a few of the examples that will be discussed in this perspective about the exciting present and the bright future of two-dimensional supramolecular assembliesThis work was partially supported by the Spanish Agencia Estatal de Investigación (AEI) (SAF2017-89890-R, PCI2019-103400, and PID2020-117143RB-I00), Xunta de Galicia (ED431C 2017/25, Centro singular de investigación de Galicia accreditation 2019–2022, ED431G 2019/03) and the European Commission (ERDF). I. I. thanks the European Commission (EC) and AEI for MSCA-IF (2018-843332) and Juan de la Cierva (FJCI-2017-31795) fellowships, respectively. J. M. thanks the ERC-STG (DYNAP, 677786), Instituto de Salud Carlos III (COV20/00297), ERC-POC (TraffikGene, 838002), Xunta de Galicia (Oportunius Program) and Human Frontier Science Programme Young Investigator Grant (RGY0066/2017) for fundingS

Arsenic and chromium topsoil levels and cancer mortality in Spain

Spatio-temporal cancer mortality studies in Spain have revealed patterns for some tumours which display a distribution that is similar across the sexes and persists over time. Such characteristics would be common to tumours that shared risk factors, including the chemical soil composition. The objective of the present study is to assess the association between levels of chromium and arsenic in soil and the cancer mortality. This is an ecological cancer mortality study at municipal level, covering 861,440 cancer deaths in 7917 Spanish mainland towns from 1999 to 2008. Chromium and arsenic topsoil levels (partial extraction) were determined by ICP-MS at 13,317 sampling points. To estimate the effect of these concentrations on mortality, we fitted Besag, York and Mollié models, which included, as explanatory variables, each town’s chromium and arsenic soil levels, estimated by kriging. In addition, we also fitted geostatistical-spatial models including sample locations and town centroids (non-aligned data), using the integrated nested Laplace approximation (INLA) and stochastic partial differential equations (SPDE). All results were adjusted for socio-demographic variables and proximity to industrial emissions. The results showed a statistical association in men and women alike, between arsenic soil levels and mortality due to cancers of the stomach, pancreas, lung and brain and non-Hodgkin’s lymphomas (NHL). Among men, an association was observed with cancers of the prostate, buccal cavity and pharynx, oesophagus, colorectal and kidney. Chromium topsoil levels were associated with mortality among women alone, in cancers of the upper gastrointestinal tract, breast and NHL. Our results suggest that chronic exposure arising from low levels of arsenic and chromium in topsoil could be a potential risk factor for developing cancer. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11356-016-6806-y) contains supplementary material, which is available to authorized users

Estudio y análisis del sistema de distribución y calidad de agua potable del casco urbano del municipio de la Mesa, Cundinamarca

La presente investigación busca identificar las condiciones actuales del servicio de la red de distribución y calidad del agua potable en el casco urbano del municipio de La Mesa Cundinamarca. Estableciendo como punto de partida la identificación de las posibles problemáticas que desmejoren el servicio en el casco urbano, con el fin de mitigar o prevenir eventuales riesgos en la población y los efectos económicos que puedan afectar a los administradores del sistema. Se recopila información acerca de la red y se analiza mediante una simulación con el software EPANET, además visitas a la Planta de Tratamiento de Agua Potable (PTAP), para diagnosticar los procesos para la potabilización del agua. Se encuentra que la diferencia de elevaciones manifestadas en la topografía del municipio impacta significativamente en los puntos de consumo ubicados en la zona 3 y parte de la zona 2, lo que causa una situación problemática en el manejo de presiones en el sistema. La información surgida de la presente investigación es una herramienta de gran importancia que impactará significativamente a los administradores del suministro y servicio de agua potable del municipio de La Mesa en Cundinamarca.The present investigation seeks to identify the current conditions of the service of the distribution network and the quality of drinking water in the urban area of ​​the municipality of La Mesa Cundinamarca. Establishing as a starting point the identification of the possible problems that deteriorate the service in the urban area, in order to mitigate or prevent possible risks in the population and the economic effects that may affect the system administrators. Information about the network is collected and analyzed through a simulation with the EPANET software, as well as visits to the Potable Water Treatment Plant (PTAP), to diagnose processes for the purification of water. It is found that the difference in elevations manifested in the topography of the municipality has a significant impact on the consumption points located in zone 3 and part of zone 2, which causes a problematic situation in the management of pressures in the system. The information arising from this research is a tool of great importance that will significantly impact the administrators of the supply and service of drinking water in the municipality of La Mesa in Cundinamarca

Momento Económico (51)

En este número: La Iniciativa del Proyecto para las Américas y la integración de América Latina. El difícil principio de una nueva década. Crisis económica y seguridad social. Un acercamiento. Desregulación y consumo popular. 1990: Los objetivos de la política tributaria. El Metro: un espacio para el comercio ambulante. La perspectiva agroalimentaria