Results 51 to 60 of about 545,568 (198)

Contactless Terahertz “Fiber Squeezer” for Tunable Dispersion Engineering in Unclad Silicon Dielectric Waveguides

open access: yesAdvanced Photonics Research, Volume 7, Issue 3, March 2026.
Terahertz microscale silicon waveguides can be wholly unclad, making it possible to interact with guided waves contactlessly via evanescent fields. We exploit this with conductive walls that enforce a movable field‐null upon modal fields, enabling tunable dispersion and cutoff similar to a fiber squeezer, albeit without physical contact.
Daniel Headland   +5 more
wiley   +1 more source

Procesos colaborativos en comunidades de práctica virtuales [PDF]

open access: yes, 2007
Este documento resume el trabajo de investigación desarrollado en el área de Web Semántica y Resolución Colaborativa de Problemas en Comunidades de Práctica Virtuales.
Estévez, Elsa Clara   +1 more
core  

Soil Properties and Plant Species Identity Independently Influence Arbuscular Mycorrhizal Fungal Composition Across Lowland Tropical Forests

open access: yesBiotropica, Volume 58, Issue 2, March 2026.
We found that plant species identity and soil properties, especially soil phosphorus availability, independently structured arbuscular mycorrhizal fungal (AMF) community composition in tropical forests across central Panama. We also found that soil nutrient availability may mediate the interaction networks between plants and AMF. ABSTRACT Plant species
Mareli Sánchez‐Juliá   +3 more
wiley   +1 more source

Procesos colaborativos en comunidades de práctica virtuales [PDF]

open access: yes, 2012
Este documento resume el trabajo de investigación desarrollado en el área de Web Semántica y Resolución Colaborativa de Problemas en Comunidades de Práctica Virtuales.
Estévez, Elsa Clara   +1 more
core  

Comunitats virtuals, ciborgs i xarxes sociotècniques: noves formes per a la interacció social

open access: yesDigithum, 2002
En els darrers anys ha aparegut molta literatura sobre els canvis que l'extensió de la Xarxa provoca en els diferents àmbits de la nostra realitat quotidiana.
Francisco Javier Tirado, Anna Gàlvez
doaj   +1 more source

Low abundance of phytophagous nematodes under invasive exotic Pinus elliottii – enemy release and plant–soil feedbacks

open access: yesNew Phytologist, Volume 249, Issue 6, Page 3060-3071, March 2026.
Summary According to the enemy release hypothesis (ERH), the fitness of exotic plants and their capacity to become invasive in their area of introduction may partly be attributable to the loss of their natural enemies. Invasive species may also benefit from modifying soil attributes and thereby creating a positive soil–plant feedback.
Lynda S. C. Guerrero   +3 more
wiley   +1 more source

Os adolescentes na rede: uma reflexão sobre as comunidades virtuais

open access: yesArquivos Brasileiros de Psicologia, 2012
Este artículo presenta resultados parciales de una encuesta realizada en foros de algunas comunidades de Orkut formadas por adolescentes. Pregunta la posibilidad de que las comunidades virtuales funcionen como un espacio de expresión de singularidades ...
Nádia Laguárdia de Lima   +3 more
doaj  

Associations Between the Cardiovascular Health Diet Index (CHDI) and Cardiometabolic Risk Factors in Brazilian Workers: A Cross‐Sectional Study

open access: yesJournal of Human Nutrition and Dietetics, Volume 39, Issue 1, February 2026.
Graphical abstract showing a cross‐sectional study of 557 workers aged 20–59, assessing dietary quality via the Cardiovascular Health Diet Index (CDHI) and its association with cardiometabolic risk factors. ABSTRACT Background The Cardiovascular Health Diet Index (CHDI) was recently developed to assess compliance with dietary recommendations aimed at ...
Estefany Mayara Sousa Araujo   +7 more
wiley   +1 more source

Manual de introducción a las comunidades virtuales

open access: yes, 2009
Una comunitat virtual és un lloc d'Internet on un conjunt de persones comparteixen els mateixos interessos i necessitats. En aquesta es dóna una interacció i comunicació entre els membres.
Ferri Aracil, Pau
core  

Alteridad y emociones en las comunidades virtuales de aprendizaje [PDF]

open access: yes, 2006
El artículo trata de un conjunto de reflexiones sobre las relaciones interpersonales y las emociones en las comunidades virtuales de aprendizaje.
Azevedo, José   +4 more
core  

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