Results 41 to 50 of about 128,360 (308)

Búsqueda en bases de datos bibliográficas

open access: yes, 2021
Las bases de datos bibliográficas, es la herramienta de mayor uso e interés para la comunidad académica. Conocer de ellas, realizar búsquedas, utilizar ecuaciones de búsqueda y recuperar información, son actividades que podemos aprender en este ...
Biblioteca
core  

One‐Step Synthesis of Si–Graphene Heterostructures via in‐Flight Gas‐Phase Mixing for High‐Capacity Silicon‐Rich Anodes

open access: yesENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A one‐step gas‐phase synthesis directly assembles amorphous Si nanoparticles with few‐layer graphene heterostructures via in‐flight mixing. Compositions with only 15 wt.% FLG deliver ~2800 mAh g−1 (Si + FLG) at 0.05 C and retain ~1400 mAh g−1 after 100 cycles at a high cycling rate of 1 C, enabled by a percolated, strain‐buffering graphene network that
Muhammad Ali   +5 more
wiley   +1 more source

Databases spatiotemporal taxonomy with moving objects. Theme review

open access: yesTecnura, 2018
Context: In the last decade, databases have evolved so much that we no longer speak only of spatial databases, but also of spatial and temporal databases.
Sergio Alejandro Rojas Barbosa
doaj   +1 more source

Policy Networks and Policy Entrepreneurship in the EU: Explaining Structural Policy Change in Pharmaceutical Innovation Incentives and Health Technology Assessment

open access: yesEuropean Policy Analysis, EarlyView.
ABSTRACT Policy process research has excelled in explaining structural policy change within national settings, but extensions and applications to the EU level have long proven challenging for scholars. Given that the EU is currently experiencing its longest period of Treaty stability since the 1980s—having evolved into a sui generis political system ...
Vassilis Karokis‐Mavrikos
wiley   +1 more source

Bases de Datos Semánticas

open access: yesRevista Latinoamericana de Ingenieria de Software, 2016
En 1992, cuando Tim Berners-Lee dio a conocer la primera  versión  de  la  Web,  su  visión  a  futuro  era  incorporar metadatos  con  información  semántica  en  las  páginas  Web.  Es precisamente   a   principios   de   este   siglo   que   inicia   el   auge repentino  de  la  Web  semántica  en  el  ambiente  académico  e Internet.
Irving Caro Fierros   +2 more
openaire   +2 more sources

Fundamentos de las Bases de Datos. Esquemas de base de datos TiendaOnLine

open access: yes, 2013
Esquemas Entidad-Relación (notación propia) y relacional de la base de datos Tienda On Line, utilizada en las prácticas de la asignatura Fundamentos de las Bases de ...
Suárez Cueto, Armando
core  

Assessment of Soil Erosion Over Six Decades in a Long‐Term Experiment Using Fallout 137Cs and RUSLE: A South American Case Study

open access: yesLand Degradation &Development, EarlyView.
ABSTRACT Soil erosion remains a major global concern affecting agricultural productivity and land sustainability. This study investigates the magnitude and variability of soil erosion in a long‐term experiment (LTE) established in 1963 in Colonia, Uruguay, aiming to compare the performance of the 137Cs tracer technique and the RUSLE model across ...
Marcos Tassano   +6 more
wiley   +1 more source

COMPORTAMIENTO DEL EVALUADOR DE PARTICIONES EN BASES DE DATOS DISTRIBUIDAS ORIENTADAS A OBJETOS

open access: yesIngeniería, 2011
Las bases de datos distribuidas orientadas a objetos presentan dificultades en el proceso de fragmentación no existen criterios claros acerca de cómo evaluar la bondad de una fragmentación con respecto a otra.
Elzbieta Malinowski Gadja
doaj   +1 more source

Fundamentos de las Bases de Datos. SQL ejercicios

open access: yes, 2013
Como no existe la lección T10, tampoco hay ejercicios numerados como T10.xxx.Ejercicios basados en los esquemas Ejemplo y Tienda On Line de la práctica SQL de la asignatura Fundamentos de las Bases de ...
Suárez Cueto, Armando   +5 more
core  

Engaging the public in plant science: Communication facilitators and barriers of scaling up a citizen science campaign

open access: yesPeople and Nature, EarlyView.
Abstract Volunteers have been involved in nature observations for decades through citizen science initiatives, providing large data sets as well as problem identification that allow a more complete understanding of many natural phenomena. Although communication is a core component in citizen science, the key factors that determine its effectiveness in ...
Kristiina Gibson   +18 more
wiley   +1 more source

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