102,381 research outputs found
Introduction: The role of modern mineralogy in cultural heritage studies
No full textThis short introduction aims to rethink the role of modern mineralogy and highlights the diverse and important contributions that it may provide in the study of materials and processes relevant to cultural heritage. It is argued that mineralogy lies in a very special position between Earth and materials sciences and that mineralogists have a profound perception of the structural and chemical complexity of natural materials. They possess knowledge of both the ancient and recent geological and physicochemical processes which produced the rawmaterials used by humans, and of the analogue processes used to transform them into artefacts. It is thus highly appropriate that a volume in the EMU series acknowledges some of the recent contributions of mineralogy to the investigation of human history, art and technology
Foliar Disease Detection in the Field Using Optical Sensor Fusion
No full textRosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 6 (2004): C. Bravo, D. Moshou, R. Oberti, J. West, A. McCartney, L. Bodria and H. Ramon. Foliar Disease Detection in the Field Using Optical Sensor Fusion. (December 2004)
The Direct Costs for Cover Crops Cultivation: Comparison Between Different Agronomical Practices
No full textHome AIIA 2022: Biosystems Engineering Towards the Green Deal
Conference paper
The Direct Costs for Cover Crops Cultivation: Comparison Between Different Agronomical Practices
Aldo Calcante, Daniele Manenti & Roberto Oberti
Conference paper
First Online: 01 July 2023
25 Accesses
Part of the Lecture Notes in Civil Engineering book series (LNCE,volume 337)
Abstract
As it is known, cover crops are plants that cover the soil between the harvest of the main crop and the seeding of the later. They are herbaceous species that are not cultivated for their commercial value, but to obtain agronomical and environmental benefits. These species are inserted in the production processes with the primary aim to maintain soil covered by vegetation in periods when the same soil would remain lacking in every cultivation, and therefore subject to damaging effect from pedological point of view. The limits of cover crops are due to their nature. Indeed, since they are crops which do not have a commercial value, the most significant aspect is related to their production costs therefore the incidence of costs for the purchase of seed, for seeding and for the termination must be limited.
The goal of this study is to experimentally evaluate and analyze in details the fuel consumption, the main operative parameters (i.e. workability and hours necessary to carry out every single mechanized activity per hectare) and costs per unit of area for fuel, labor and agrochemical required for the cover crops cultivation, as a function of different agronomical practices applied. In particular, the study takes into account the following agronomical practices: 1) conventional tillage, 2) minimum tillage, 3) direct seeding and 4) no-tillage and, to destroy cover crop, the mechanical and the chemical termination
Georg Wilhelm Friedrich Hegel, Lezioni sulla filosofia della religione, a cura di E. Oberti e G. Borruso
No full textDruet Pierre-Philippe. Georg Wilhelm Friedrich Hegel, Lezioni sulla filosofia della religione, a cura di E. Oberti e G. Borruso. In: Revue Philosophique de Louvain. Quatrième série, tome 75, n°27, 1977. pp. 536-537
L'estetica di Elisa Oberti tra metafisica e fenomenologia.
No full textElisa Oberti (1920-1975), la pensatrice milanese che insegnò all'Università Cattolica del S. Cuore dov'era stata allieva di G. Bontadini, formulò nei suoi scritti una teoria estetica che merita oggi di essere riconsiderata nel contesto della filosofia cattolica lombarda, per la curvatura originale con cui le istanze della metafisica e della fenomenologia sono state rese non solo tra loro compatibili ma complici di un disegno al centro del quale Oberti pose l' "oggetto artistico come presenza evidenziata". La teoria obertiana è qui esaminata nello sfondo di una stagione del pensiero cattolico lombardo che ebbe uno dei suoi fulcri dialettici nei convegni filosofici di Gallarate nella prima metà degli anni Cinquanta.
Una nota biografica e una bibliografica corredano questa monografia in memoria di Elisa Oberti a ventidue anni dalla morte
New Amphibole Compositions: Natural and Synthetic
No full textIn this chapter, we examine the new amphibole compositions which have been found and characterized since 1981, i.e. since the publication of volume 9A of the MSA Reviews
in Mineralogy. We divide the chapter in two sections. The fi rst section describes new charge arrangements found in Nature, and the second section describes the extensive studies of synthetic amphiboles of novel composition done to clarify the crystal chemistry of exotic cations which
are normally found as minor components. This chapter deals exclusively with monoclinic
amphiboles, as the compositional space of orthorhombic amphiboles has not expanded since the former review. Although natural occurrences of protoamphibole (with space group Pnmn) have been described only in the last twenty years (Sueno et al. 1998; Konishi et al. 2003), their
composition is within the compositional range previously defi ned for Pnma amphiboles
The crystal chemistry of gismondines: the non-existence of K-rich gismondines
No full textMicroprobe analyses and unit cell dimensions are tabulated for gismondines from 17 localities. Their chemical composition varies only slightly from the stoichiometric formula Ca4Al8Si8O32.18H2O. The Si/(Al + Si) ratio varies from 0.514 to 0.542; Ba, Fe and Mg are always absent and K, Na and Sr are low or absent. The K-rich analyses in the literature are explained by the frequent occurrence of phillipsite-gismondine intergrowths. No correlation between the relatively constant cell dimensions and chemical composition was found. The strongest correlation is between Si/(Al + Si) and (Na + K)/(Na + K + Ca). The narrow range of chemical variation in this zeolite is attributed to the ordered (Si,Al) distribution. TG and DTG curves are given for one gismondine.-R.A.H
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