1,758 research outputs found
Donato Attanasio, Mauro Brilli & Neil Ogle, The Isotopic Signature of Classical Marbles, 2006
No full textDemelenne Marie. Donato Attanasio, Mauro Brilli & Neil Ogle, The Isotopic Signature of Classical Marbles, 2006. In: L'antiquité classique, Tome 77, 2008. pp. 757-758
Donato Attanasio, Mauro Brilli & Neil Ogle, The Isotopic Signature of Classical Marbles, 2006
No full textDemelenne Marie. Donato Attanasio, Mauro Brilli & Neil Ogle, The Isotopic Signature of Classical Marbles, 2006. In: L'antiquité classique, Tome 77, 2008. pp. 757-758
The role of water-rock ratio and temperature in the isotopic alteration of flysch rock in the Tolfa Mountain mining district (Latium, Central Italy)
No full textCarbon and oxygen isotope analyses have been performed on calcium carbonate samples from flysch rocks collected in the south of Tolfa and Allumiere villages (Central Italy). Large variation it) delta(18)O occurs from values around +28 per mil (SMOW), typical of marine carbonates, down to values of about +9 per mil (SMOW). The lower values are measured on samples collected close to phanerocrystalline carbonate deposits outcropping in the area and interpreted as part of a hydrothermal vein system. delta(13)C does not show large variation, and, aside from a few outliers, falls within a range of 0 and +2 per mil (PDB). Similar carbon and oxygen isotope spatial relationships between the flysch country rocks and the phanerocrystalline carbonate deposits were determined in a previous study by FERRINI & MASI (1987), who interpreted the O-18 depletion as due to interaction of the host rock with an aqueous fluid at hydrothermal temperatures below 250degreesC and with a water to rock ratio progressively increasing toward the carbonate vein. The combined results indicate that hydrothermal fluid temperature largely regulates oxygen isotope variation (and possibly the carbon and oxygen deltas co-variation) with respect to the variation of the water to rock ratio
Does stable isotope analysis separate transgenic and traditional corn (Zea mays L.) detritus and their consumers?
No full textTransgenic corn Crops (including the Bt variety) are expanding rapidly worldwide, and the large amounts of cultural residues remaining after harvest pose questions about the fate of this novel source of plant detritus in soil. To verily whether transgenic and conventional corn litters were different in their isotopic signatures, the C-13 and N-15 stable isotopes of different portions of Bt and non-Bt Aristis corn plants after harvest were analysed. Laboratory feeding experiments were then conducted to assess the transfer of corn isotopic signals to detritivores using the isopod Trachelipus sp, reared on either Bt or non-Bt corn dead leaves as the only food source. delta N-15 differed significantly between Bt and non-Bt corn in kernels and sterns, whereas both delta N-15 and delta C-13 were different in leaves before and after exposure to isopods. During feeding, the N and C isotopic signatures of' isopods shifted towards the diet values. Significant differences existed both between sampling dates and corn treatments. The results suggest that detritus from transgenic and conventional corn crops may have different isotopic signatures and the isotopic differences can persist through the trophic levels, making corn detritus feeders suitable sentinel species for the Bt corn isotopic signal in agroecosystems. (c) 2006 Elsevier B.V. All rights reserved
Conversations with Cabrera: Mauro Guillén
No full textPresented online January 26, 2021, 3:00 p.m.-4:00 p.m.Conversations with Cabrera are unscripted and informal, unearthing leadership’s thinking behind the big ideas taking shape across the Institute and trends likely to define our future. This video series is meant to capture candid conversations between President Ángel Cabrera and thought leaders across Georgia Tech and beyond.Ángel Cabrera, President, Georgia Institute of Technology, Atlanta, GA.Mauro Guillén, Zandman Professor at the Wharton School of the University of Pennsylvania and director of the Penn Lauder Center for International Business Education and Research (CIBER).Runtime: 56:53 minutesPresident Ángel Cabrera in conversation with author and educator Mauro Guillén. They discuss the themes of Guillén's book, 2030: How Today's Biggest Trends Will Collide and Reshape the Future of Everything. Mauro Guillén’s bestselling book 2030 is both a remarkable guide to the coming changes and an exercise in the power of “lateral thinking,” thereby revolutionizing the way you think about cataclysmic change and its consequences
No Europe without Brussels: The Berlaymont Building and the Development of the Léopold Area
No full textEurope and Brussels had a mutual dependency from the founding of the European Communities. This article explores the historic relation between local urban and the transnational development of post-war Europe. It ultimately raises the question to what extent there exists a dialogue between various actors involved to actively design and build the image of Europe in Brussels.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care. Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.History, Form & Aesthetic
AT THE ORIGINS OF ROME: URBANIZATION, AGRICULTURE AND CLIMATE IN IRON AGE
No full textThe beginning of Iron Age in Central Italy witnessed increasing social complexity, urbanization processes and climatic instability. However, understanding the mutual relations of these events as well as their effects on past agriculture is still a complex matter. This research aims at investigating changes in agricultural systems and environmental variability through the analysis of macrobotanical samples retrieved from multiple archaeological contexts dating between the 10th and the 6th century BCE. Recent excavations at the site of Gabii, situated at the outskirt of Rome, provided charred carpological material (seeds, fruits and woods) coming from different Iron Age and Archaic levels. As Gabii was an important Latin city which experienced this phase of urbanisation such data are crucial for the understanding of its socio-economic development. Preliminary results show the presence of several cultivated cereals, mainly represented by caryopsis of Hordeum vulgare and Triticum dicoccum but also few T. monococcum. Pulses include Vicia faba and V. ervillia. Some weeds are also attested, such as Lolium sp. In addition, the analysis of the stable isotopes of carbon and nitrogen of both charred seeds/fruits and woods will allow the study of the past water availability as well as the crops growing conditions and farming practices, informing us, to a certain extent, about the possible effects of climate fluctuation on the development of these ancient societies and their agriculture
Volcanic eruptions from ghost magma chambers
No full textRecent studies have proposed that magma reservoirs crystallized to a virtually rigid crystal-mush can be partially remelted by diffusion of hot fluids. We show that for a crystal mush with the composition of a K-trachyte from the Campanian Ignimbrite (CI) Eruption, remelting can occur without a significant increase of the magma temperature, but simply by diffusion of H2O by the magmatic gases feeding the system. The CI origin is not the issue here, but rather the chemical and physical behavior of an almost solidified magma mass left over in a reservoir after a major eruption. To test our hypothesis, we run high pressure/high temperature laboratory experiments to study the kinetics of water diffusion, together with thermodynamics and fluid diffusion modelling. For small diffusivities, or large diffusion time, the remelting mechanism proposed above needs to be replaced by other processes as gas percolation or intrusion of a magmatic mass
Between La Tendenza and Neoliberty: Mauro Baracco Goes to Australia
No full textDiscussion of various relationships between Italian postmodern architecture (including works by Aldo Rossi, Gianni Braghieri and Gabetti&Isola), Australian postmodern architecture (including Edmond&Corrigan and Robin Boyd among others), and theoretical and design approach undertaken by the author (Mauro Baracco) as both a practitioner (director of Baracco+Wright Architects, Melbourne) and an academic (Associate Professor in Architecture and Urban Design, RMIT University, Melbourne)
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