Results 41 to 50 of about 1,378,497 (210)
Reformas en educación científica [PDF]
, 2004 Se presentan algunas características de las reformas educativas en ciencia, matemática y tecnología que se llevan a cabo en Latinoamérica. Se discute como estas reformas intentan reconstruir el contenido científico, matemático y tecnológico pero en el ...
Cajas, Fernando
core
Physical origin of the high energy optical response of three-dimensional photonic crystals [PDF]
, 2007 The physical origin of the optical response observed in three-dimensional photonic crystals when the photon wavelength is equal or lower than the lattice parameter still remains unsatisfactorily explained and is the subject of an intense and interesting ...
Depine, Ricardo A. +3 more
core +2 more sources
Advanced Materials, EarlyView.In this work, low bandgap (≈1.55 eV) semitransparent perovskite solar cells (ST‐PSCs) having thin (thickness < ≈100 nm) perovskite layers and transparent conductive oxide‐based rear electrodes are fabricated using vacuum‐deposition methods. Two different ST‐PSCs demonstrated a high light utilization efficiency value of 4.2 (PCE: 9.26% and AVT: 45.3 ...
Abhyuday Paliwal +9 more
wiley +1 more source
, 2017 espanolEl proposito de esta investigacion fue identificar y caracterizar las creencias del profesorado de ciencias acerca de la relacion ciencia - genero. Para esto, se realizaron analisis estadisticos e interpretativos de los datos recolectados a traves
J. González
semanticscholar +1 more source
Ciencias Marinas, 2017 In order to compare phytoplankton biomass (satellite-derived chlorophyll, Chlsat) and production (PP), and sea surface temperature (SST) between the regions north and south of the Ensenada Front, time series were generated from satellite imagery for 250-
Uriel Mirabal-Gómez +2 more
doaj +1 more source
Educación científica para una sociedad sostenible. [PDF]
, 2004 A lo largo de las dos últimas décadas, se han multiplicado los llamamientos de diversos organismos para que los educadores contribuyamos a que la ciudadanía adquiera una correcta percepción de los problemas y desafíos a los que se enfrenta la vida en ...
Gil Pérez, Daniel +1 more
core +1 more source
In Situ Amine Formation to Modulate MOF‐Derived PdIn N‐Doped Carbon Catalysts
Advanced Materials, EarlyView.An amine‐assisted approach converts PdIn‐MOF into PdIn intermetallic nanoparticles embedded in N‐doped carbon. In situ‐generated amines trigger early Pd nucleation, producing smaller PdIn domains than direct pyrolysis. Amine sterics and basicity tune composition and particle size, while solvent and amine co‐determine textural features.
Gonzalo Egea +9 more
wiley +1 more source
Numerical simulation of the hydrodynamics of a port and effect of a wave-driven seawater pump
Ciencias Marinas, 2005 A three-dimensional numerical model was adapted to study the circulation, stratification and mixing patterns inside the port of El Sauzal. Salinity, temperature and density field data were measured, showing that density variations were mainly due to the
Xavier Flores-Vidal +2 more
doaj +1 more source
Las actitudes en la educación científica [PDF]
, 2008 La bibliografía señala que el alumnado va perdiendo el interés por las ciencias y su aprendizaje a medida que transcurre el curso. El trabajo del profesorado es conseguir que estas actitudes iniciales se mantengan e incluso que aumenten. Para el análisis
Gavidia Catalán, Valentín
core
Non‐Stationary Dry‐Spell Hazard Probabilities for Spain
International Journal of Climatology, EarlyView.This study assesses long‐term changes in dry‐spell hazard probabilities across Spain (1961–2024) using a novel non‐stationary extreme value framework applied to daily precipitation records from a dense observational network. Results show that dry‐spell duration and associated return levels are dominantly stationary, with non‐stationary models providing
S. M. Vicente‐Serrano +13 more
wiley +1 more source