RIED. Revista iberoamericana de educación a distancia

Resumen basado en el de la publicaciónTítulo, resumen y palabras clave también en inglésMonográfico con el título: “La integración efectiva del dispositivo móvil en la educación y en el aprendizaje"Se plantea el debate sobre las innovaciones y tecnologías disruptivas, proponiendo que el aprendizaje digital (nueva versión de la educación a distancia) está suponiendo una disrupción educativa porque plantea un cambio drástico de soportes y métodos y porque progresivamente va ganando espacio a los formatos convencionales. Se concluye afirmando que esta tendencia no está agotada, sino que continúa penetrando y ahondando la ruptura con las nuevas tecnologías, como, por ejemplo, las analíticas de aprendizaje, el aprendizaje adaptativo y el aprendizaje móvil.ES

High Sensing Properties of 3 wt % Pd-Doped SmFe_1–<i>x</i>Mg_<i>x</i>O₃ Nanocrystalline Powders to Acetone Vapor with Ultralow Concentrations under Light Illumination

Nanocrystalline powders of 3 wt % Pd-doped SmFe_1–<i>x</i>Mg_<i>x</i>O₃ (<i>x</i> = 0, 0.1, 0.2, and 0.3) were prepared by a sol–gel method and annealed at 750 °C. Pd:SmFe_0.9Mg_0.1O₃ has a maximum response at 220 °C. When exposed to 0.5 ppm acetone vapor, the response of undoped SmFeO₃ is 2.26 and the response of Pd:SmFe_0.9Mg_0.1O₃ is 7.16. Under light illumination, Pd:SmFe_0.9Mg_0.1O₃ has a better sensing performance and lower optimal operating temperature. The sensor shows good selectivity and stability for acetone vapor. The high response and good selectivity of Pd:SmFe_0.9Mg_0.1O₃ to ultralow concentrations of acetone vapor indicate its potential for applications in many areas

[[(Ethoxycarbonyl)difluoromethyl]thio]phthalimide: A Shelf-Stable, Electrophilic Reagent with a Convertible Group for the Synthesis of Diversified Fluoroalkylthiolated Compounds

A shelf-stable and easily convertible reagent for the preparation of diversified fluoroalkylthiolated compounds, [[(ethoxycarbonyl)­difluoromethyl]­thio]­phthalimide, was developed. [[(Ethoxycarbonyl)­difluoromethyl]­thio]­phthalimide is an efficient electrophilic fluoroallylthiolating reagent that reacted with electron-rich heteroarenes/arenes, β-ketoesters, oxindoles, benzofuranones, and thiols. More importantly, the ethoxycarbonyl group of the resulting fluoroalkylthiolated compounds could be easily converted into various other functional groups such as chloride, alkynyl, hydrocarbonyl, carbomoyl, hydromethyl, or heteroaryl groups

Nitrogen-Doped Carbon-Based Acidic Ionic Liquid Hollow Nanospheres for Efficient and Selective Conversion of Fructose to 5‑Ethoxy­methyl­furfural and Ethyl Levulinate

Nitrogen-doped carbon-based acidic ionic liquid hollow nanospheres, [C₃N]­[SO₃CF₃]-HCSs (C₃ = <i>Pr</i>SO₃H), with different particle sizes (100–900 nm) and shell thicknesses (5–25 nm) as well as interesting morphology-dependent porosity properties were successfully prepared via quaternary ammonization of nitrogen atoms of hollow nitrogen-doped carbon nanospheres by 1,3-propane sultone followed by anion exchange with trifluoro­methane­sulonic acid. The [C₃N]­[SO₃CF₃]-HCSs were applied in selective conversion of fructose (FOS) to promising fuel blends, 5-ethoxy­methyl­furfural (5-EMF) and ethyl levulinate (EL). It showed the [C₃N]­[SO₃CF₃]-HCSs exhibited high total yields of 5-EMF and EL (higher than 90%), regardless of their particle size and shell thickness, attributed to extremely high selectivity to both compounds, and thereby, very few side products including soluble oligomers and humins were produced. Additionally, the product distribution strongly depended on the morphology and porosity properties of the [C₃N]­[SO₃CF₃]-HCSs. [C₃N]­[SO₃CF₃]-HCSs-<b>1</b> with the smallest particle size, thinnest shell, and largest Brunauer–Emmett–Teller (BET) surface area possessed the highest EL yield (89.7%), while [C₃N]­[SO₃CF₃]-HCSs-<b>4</b> with the smallest particle size, thickest shell, and smallest BET surface area gave rise to the highest 5-EMF yield (67.2%). More importantly, the [C₃N]­[SO₃CF₃]-HCSs can be reused five times without changes in catalytic activity, Brønsted acid nature, morphology, and porosity properties

Vertically Aligned Graphene Sheets Membrane for Highly Efficient Solar Thermal Generation of Clean Water

Efficient utilization of solar energy for clean water is an attractive, renewable, and environment friendly way to solve the long-standing water crisis. For this task, we prepared the long-range vertically aligned graphene sheets membrane (VA-GSM) as the highly efficient solar thermal converter for generation of clean water. The VA-GSM was prepared by the antifreeze-assisted freezing technique we developed, which possessed the run-through channels facilitating the water transport, high light absorption capacity for excellent photothermal transduction, and the extraordinary stability in rigorous conditions. As a result, VA-GSM has achieved average water evaporation rates of 1.62 and 6.25 kg m^–2 h^–1 under 1 and 4 sun illumination with a superb solar thermal conversion efficiency of up to 86.5% and 94.2%, respectively, better than that of most carbon materials reported previously, which can efficiently produce the clean water from seawater, common wastewater, and even concentrated acid and/or alkali solutions

Trifluoromethyl-Substituted Sulfonium Ylide: Rh-Catalyzed Carbenoid Addition to Trifluoromethylthioether

A highly efficient Rh-catalyzed carbenoid addition to trifluoro­methyl­thioether for the formation of trifluoromethyl-substituted sulfonium ylide is described. The trifluoro­methyl-substituted sulfonium ylide can act as an electrophilic trifluoro­methylation reagent, as demonstrated by trifluoro­methylation of β-ketoesters and aryl iodides

Effectiveness of our DET kernel.

<p>Effectiveness of our DET kernel.</p

Comparisons between our method and some state-of-the-art systems.

<p>Comparisons between our method and some state-of-the-art systems.</p

An example of the maximum matching in the bipartite graph.

<p><i>Cona</i> and <i>Conb</i> are two different contexts. The maximal matching between <i>Cona</i> and <i>Conb</i> is flagged with solid lines. Edges with weight 0 are bypassed and all weights are rounding in this figure.</p

The ROC curves of three experiments: the feature-based kernel, the combination of feature-based kernel and DET kernel, and the kernel integrating three individual kernels.

<p>The ROC curves of three experiments: the feature-based kernel, the combination of feature-based kernel and DET kernel, and the kernel integrating three individual kernels.</p