Results 31 to 40 of about 334,060 (206)

Ubicación óptima de condensadores en sistemas de distribución de energía eléctrica usando un modelo linealizado [PDF]

open access: yes, 2015
En este proyecto de grado se presenta una metodología para resolver el problema de ubicación y dimensionamiento optimo de condensadores para una red de distribución de energía eléctrica.
Arias Rojas, Iván Andrés   +1 more
core  

Interactions Between Dissolved Organic Carbon and Aluminium Activity in Tropical and Temperate No‐Till Agroecosystems

open access: yesJournal of Sustainable Agriculture and Environment, Volume 5, Issue 1, March 2026.
Conceptual model of depth‐stratified soil acidification under long‐term no‐till in temperate (Washington, USA) and tropical (Brazilian Oxisol) systems. Nitrogen inputs promote surface acidification (↓pH) and increased Al3+ activity, while lime or silicate amendments modify base cation dynamics. Increased DOC–Al complexation reduces free Al3+ and alters
Joao A. Antonangelo, Richard T. Koenig
wiley   +1 more source

Software Radio para antenas inteligentes en comunicaciones personales multistandard [PDF]

open access: yes, 1998
Peer ReviewedPostprint (published ...
Cabrera-Bean, Margarita   +6 more
core  

The Changing Landscape of Root‐Knot Nematodes in Brazilian Soybean Fields: Shifting Prevalence of Meloidogyne arenaria, M. incognita and M. javanica and the Occurrence of an Emerging Species, M. enterolobii

open access: yesPlant Pathology, Volume 75, Issue 2, March/April 2026.
An integrative biochemical and molecular survey of 344 soybean fields across Brazil revealed shifts in Meloidogyne species composition, high co‐occurrence rates, and the first report of M. enterolobii in commercial soybean fields, highlighting its geographic expansion and the need for improved nematode management strategies.
Francisco de Assis dos Santos Diniz   +4 more
wiley   +1 more source

Vieja y nueva migración. Rasgos, supuestos y evidencias

open access: yesRevista Internacional de Sociología, 2000
El artículo revisa las diferencias más notables entre los flujos actuales y los precedentes. Se examinan después los diversos factores que intervienen en su génesis destacando, en este sentido, el papel de una serie de elementos de índole social y ...
María Jesús Criado
doaj   +1 more source

The Role of the European Union in Managing African Crises Between Development Aid and Geopolitical Interests

open access: yesWorld Affairs, Volume 189, Issue 1, Spring 2026.
ABSTRACT This study conducts a comprehensive and critical examination of the interplay between development assistance and strategic geopolitical objectives in the European Union's (EU) engagement with African crises. Although the EU positions itself as a normative power committed to advancing peace, development, and human rights, its practices often ...
Edmond Chick   +1 more
wiley   +1 more source

A respeito de trágicos e ébrios

open access: yesPitágoras 500, 2013
A pós-modernidade encena uma subjetividade descentrada; isto abala as noções de corpo próprio, social e coletivo. O capitalismo global precariza o trabalho, estabelecendo novos modos de produção material e simbólica.
Carmem Gadelha
doaj   +1 more source

La cooperación de Brasil: un modelo en construcción para una potencia emergente [PDF]

open access: yes, 2010
Los medios de comunicación, los analistas y los mercados han prestado gran atención a la consolidación de Brasil como potencia emergente, principalmente en el terreno económico y de la gobernanza global.
Ayllón, Bruno
core  

Burning Forest Biomass Is Not an Effective Climate Mitigation Response and Conflicts With Biodiversity Adaptation

open access: yesClimate Resilience and Sustainability, Volume 4, Issue 2, December 2025.
ABSTRACT Pathways are proposed for progressing the goal of decarbonizing economies that rely on burning forest biomass for heat and electricity (bioenergy) based on the proposition that this creates benefits for the climate. The potential for negative impacts on biodiversity are either assumed to be benign or ignored. We critically examined claims, and
B. G. Mackey   +3 more
wiley   +1 more source

La cooperación de Alemania en los procesos de justicia transicional en Colombia y su posicionamiento en el sistema internacional [PDF]

open access: yes, 2015
La presente investigación da cuenta la relación entre la cooperación alemana en materia de Justicia Transicional en Colombia y el posicionamiento de este país europeo como potencia civil en materia de cooperación internacional.
Silva Otálora, Michelle
core  

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