Search results for "amount"

INNOVAZIONE DEI MATERIALI NATURALI: TERRA E NANOTUBI DI ARGILLA PER UNA SFIDA SOSTENIBILE

2019

All’interno del dibattito culturale che vede la questione ambientale come prioritaria e con riferimento a studi e ricerche che negli ultimi anni hanno promosso materiali compositi a base di terra cruda, gli Autori, consapevoli della necessità che il rapporto fra Progetto e Materia debba assumere una nuova centralità supportato dalle specificità della Tecnologia dell’Architettura, illustrano le risultanze di una sperimentazione che ha l’obiettivo di migliorare le prestazioni della terra cruda con l’apporto delle nanotecnologie, sviluppando un ‘nuovo materiale’ con una ridotta embodied energy e una ridotta quantità di emissioni di CO2 in atmosfera.

Uncertainty-reducing cooperation scripts in online learning environments

2004

Online learning courses can create new interaction situations for participants who have not previously worked with each other. Initially, there is some degree of uncertainty between participants in these interaction situations. According to the uncertainty reduction theory, low uncertainty increases theamount of discourse and decreases information seeking. Thus, uncertainty may influence online discourseand learning. However, the relation of uncertainty reduction to learning outcomes has not yet been investigated systematically. Cooperation scripts may reduce uncertainty, and therefore enhance learning.A cooperation script, which aims to reduce uncertainty at a cognitive level, was chosen f…

Does landscape diversity influence species fitness in farmland plants ?

2015

In agriculture, landscape management research has proven extremely valuable for explaining species amount, such as how species capture and utilize changed landscape resources to maintain population size and community diversity. What is surprising is the apparent lack of comparable studies on the effects of landscape properties and management on species fitness. Here, we search for "pathological" situations where landscape effects on farmland plant amount mask significantly different effects on fitness. We examined the case of 83 weed species in 256 fields distributed across the UK national scale. Whether at the local scale of the neighborhood or the larger scale of 2 km, we find landscape e…

Impact of campaigns to control common ragweed on the pollen production in France

2014

National audience; The dispersion of common ragweed (Ambrosia artemisiifolia L.) is anthropogenic, and because it is an invasive plant, a number of control procedures have been implemented whose effectiveness was measured. Measures on pollen emissions were compared between areas with different level of management. In addition to pollen traps of the French aerobiology network (RNSA), passive traps (SLT: SIGMA2 Like Trap) were positioned near controlled or non-controlled areas. Two areas were selected: - infested areas, in Rhône-Valley, 12 SLT were set up: 8 in Estrablin, with 2 in non-controlled areas and 6 in well-controlled areas; 4 near Valence, with one in non-controlled area and 3 in we…

"Sądowa egzekucja" kontaktów z dzieckiem

2019

Microfluidic Pumping by Micromolar Salt Concentrations

2017

An ion-exchange-resin-based microfluidic pump is introduced that utilizes trace amounts of ions to generate fluid flows. We show experimentally that our pump operates in almost deionized water for periods exceeding 24h and induces fluid flows of um/s over hundreds of um. This flow displays a far-field, power-law decay which is characteristic of two-dimensional (2D) flow when the system is strongly confined and of three-dimensional (3D) flow when it is not. Using theory and numerical calculations we demonstrate that our observations are consistent with electroosmotic pumping driven by umol/L ion concentrations in the sample cell that serve as 'fuel' to the pump. Our study thus reveals that t…

Digital content marketing in B2B contexts: The drivers of engagement and electronic word of mouth communication at international trade shows

2023

El potencial que representan las redes sociales como una herramienta de marketing es indiscutible, permiten compartir información, construir redes, e influir en consumidores y marcas. Aún más, las redes sociales contribuyen al engagement empresa a empresa (B2B por sus siglas en inglés), ofreciendo un entorno perfecto para su desarrollo. En este sentido, la literatura en marketing ha reconocido la utilidad de las redes sociales en la promoción de ferias comerciales internacionales (ITS por sus siglas en inglés) empresa a empresa. Adicionalmente, en tiempos de crisis como lo es el COVID-19, la comunicación es uno de los principales desafíos en la gestión de emergencias, y las redes sociales s…

Enseñanza de las ciencias : revista de investigación y experiencias didácticas

2021

Nota: resumen tomado de la revista En este trabajo se describe el origen y evolución del significado de los conceptos de cantidad de sustancia y de mol considerando las contribuciones hechas por la Historia de la Química. Por otra parte, se plantea el serio desacuerdo que se presenta entre las ideas actuales de los profesores de Química en esos conceptos y las recomendaciones de la comunidad científica internacional. Se señalan las implicaciones didácticas que estas dificultades epistemológicas pueden tener para la enseñanza de la Química. Cataluña ESP

The Foundation Seamount Chain: A first survey and sampling

1997

The Foundation Seamounts form a 1400 km-long chain on the Pacific plate from 32 °S, 127 °W to the Pacific-Antarctic spreading axis at 38 °S, 111 °W. Previously only known from sparse single-beam echosoundings and satellite altimetry, we present here the first multibeam bathymetric survey and geological sampling results. We confirm that the submarine topography correlates with the altimetry, and that the chain is volcanic rather than tectonic or microcontinental in origin. The chain can be divided up morphologically and geochemically into three section: (1) west of 125 °W large flat-topped volcanoes composed of incompatible-element depleted lavas ( ≈ 1) of a near-ridge origin with little or …

Geophysical investigation of Pleistocene volcanism and tectonics offshore Capo Vaticano (Calabria, southeastern Tyrrhenian Sea)

2015

Abstract Magma upwelling forming volcanic plumbing systems in back arc settings is typically controlled by extensional tectonic structures of the upper crust. Here we investigate this process in the area between the volcanic arc of the Aeolian Islands and the Calabrian arc (SE Tyrrhenian Sea) by integrating morpho-bathymetry and reflection seismic data with the outcomes of “Inverse 3D magnetic modeling” of previously gathered aeromagnetic data. Morpho-bathymetric data highlight the presence of a seamount ∼10 km offshore Capo Vaticano Promontory (eastern Calabria). This feature, named Capo Vaticano seamount is composed of a series of NE-trending ridges, the greatest of which (R1) is ∼12 km l…