Search results for " classification"
showing 10 items of 1043 documents
Methodological approaches to the valuation of forest ecosystem services: An overview of recent international research trends
2021
Forests represent the most important source of ecosystem services (ES) on a global level both for the production of goods and for the provision of services and externalities, nevertheless scientific research in the economic field is lacking. Currently the number of documents relating to ES is 16 673, of which only 1 379 concern the forestry sector. The aim of this study is to provide an overview of scientific research trends in the field of economic evaluation of forest ecosystem services (FES). To this end, an on-line bibliographic survey was carried out on the main scientific search engines, which made it possible to quantify the works and at the same time to detect the main evaluation me…
U-Pb data on zircons for the thermal peak of metamorphism in the Variscan Odenwald, Germany
1995
U-Pb data are presented for zircons from metamorphic rocks of the crystalline Odenwald that comprises part of the Mid-German Crystalline Rise. The Odenwald can be divided into four principal domains with different magmatic and metamorphic histories on the basis of published structural and petrological data and the presented ages. In the eastern (Boll-stein) Odenwald the metasedimentary rocks contain zircons derived from basement rocks that exceed 2.2 Ga in age. The intrusion of granitic magmas into these metasedimentary rocks took place before or close to the end of the thermal peak of metamorphism at 375 ± 5 Ma ago. Rapid uplift of the Bollstein Odenwald occurred at about 320 Ma bp, later …
Multi-chronometric ages and origin of Archaean tonalitic gneisses in Finnish Lapland: A case for long crustal residence time
1984
The Tojottamanselka gneisses of the Koitelainen region, northern Finland, have been dated by the Sm-Nd and the common Pb methods. The Sm-Nd data of seven samples from a small area (100 m × 100 m) define an isochron ofT=3.06±0.12 (2σ) Ga, with correspondingINd=0.50848±9 (2σ), oreNd(T)=−3.7±1.8. This age is in good agreement with the zircon U-Pb discordia age (3.1 Ga) reported by Kroner et al. (1981) and is interpreted as the time of magmatic emplacement. The distinctly negativeeNd(T) value is found for the first time for Archean tonalitic gneisses and implies derivation of these magmas by remelting of continental material with a long (200–500 Ma) crustal residence time. A few samples, on the…
Stable Cu and Zn isotope ratios as tracers of sources and transport of Cu and Zn in contaminated soil
2010
Abstract Copper and Zn metals are produced in large quantities for different applications. During Cu production, large amounts of Cu and Zn can be released to the environment. Therefore, the surroundings of Cu smelters are frequently metal-polluted. We determined Cu and Zn concentrations and Cu and Zn stable isotope ratios (δ 65 Cu, δ 66 Zn) in three soils at distances of 1.1, 3.8, and 5.3 km from a Slovak Cu smelter and in smelter wastes (slag, sludge, ash) to trace sources and transport of Cu and Zn in soils. Stable isotope ratios were measured by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) in total digests. Soils were heavily contaminated with concentrations u…
DYNAMIC SEMANTIC USER PROFILING FROM IMPLICIT WEB NAVIGATION DATA
2014
International audience; On the Web, pages are often dynamically generated and allow publishers to individually adapt contents to each viewer. Underlying systems must correctly understand the user's context - crucial especially in the case of online advertisement placement. The article at hand describes our proposition of a novel profiling system, adapted to the special needs of digital advertising. Based on Semantic Web Technologies, the MindMinings system relies on an ontology to enable thorough understanding of each user's context and needs. The underlying ontology structure also provides enhanced interoperability with semantically annotated knowledge resources, notably vocabularies from …
NEIGHBORHOOD EFFECTS IN SPATIAL HOUSING VALUE MODELS. THE CASE OF THE METROPOLITAN AREA OF PARIS (1999)
2009
In hedonic housing models, the spatial dimension of housing values are traditionally processed by the impact of neighborhood variables and accessibility variables. In this paper we show that spatial effects might remain once neighborhood effects and accessibility have been controlled for. We notably stress on three sides of neighborhood effects: social capital, social status and social externalities and consider the accessibility to the primary economic center as describing the urban spatial trend. Using spatial econometrics specifications of the hedonic equation, we estimate whether spatial effects impact the housing values. Our empirical case concerns the Metropolitan Area (MA) of Paris i…
Hemocyte types and some plasmatic properties of two edible crabs Cancer borealis and Cancer pagurus
2015
Cancer pagurus and Cancer borealis and are edible crabs produced by economically relevant aquaculture. In this study the hemocytes and some plasmatic parameters of Cancer borealis and Cancer pagurus were examined. The cell features of the hemocytes were observed using light and scanning electron microscopy (SEM). Granulocytes, semigranulocytes and hyalinocytes were mainly identified on the basis of size, presence/absence and quantity of the cytoplasmic granules and the nucleus-to-citoplasma (N/C) ratio. SEM observations were useful for disclosing the surface features of these cells, and the same characteristics were found in both crab species. A smooth surface distinguishes elongated hyalin…
Hyperspectral Image Classification with Kernels
2007
The information contained in hyperspectral images allows the characterization, identification, and classification of land covers with improved accuracy and robustness. However, several critical problems should be considered in the classification of hyperspectral images, among which are (a) the high number of spectral channels, (b) the spatial variability of the spectral signature, (c) the high cost of true sample labeling, and (d) the quality of data. Recently, kernel methods have offered excellent results in this context. This chapter reviews the state-of-the-art hyperspectral image classifiers, presents two recently proposed kernel-based approaches, and systematically discusses the specif…
Le traduzioni dall’inglese nelle prime due serie della Biblioteca dell’Economista : ipotesi di studio da una prospettiva linguistica
2011
From 1850 to 1868, the Sicilian economist Francesco Ferrara was editor-in-chief of the Biblioteca dell’Economista, a series of economic treatises – published in Italy and abroad – among the best known and most important of that period. Ferrara and his assistants, among whom was his friend Emerico Amari, translated scores of economic pages into Italian laying the foundation to the specialized translation in the economic field. They also contributed to the development and further specialization of an Italian economic lexicon. This paper provides three research targets on Ferrara’s and Amari’s work from a linguistic point of view. The three proposals, already part of a study project carried ou…
Hroniska pankreatīta ķirurģiskās ārstēšanas rezultāti: sešu gadu pieredze Rīgas Austrumu klīniskās universitātes slimnīcas, stacionārā "Gaiļezers"
2022
Ievads. Hronisks pankreatīts (HP) ir progresējoša iekaisuma slimība aizkuņģa dziedzerī, kas rada neatgriezenisku dziedzera audu atrofiju un fibrozi. Tas pakāpeniski rada eksokrīnu un endokrīnu aizkuņģa dziedzera mazspēju. Slimībai progresējot, pastiprinoties sāpju sindromam, aizkuņģa dziedzerī attīstās arī lokālas komplikācijas. Iepriekšminētais rada indikācijas ķirurģiskai ārstēšanai. Iespējamo operāciju veidi iedalās divās grupās: rezecējošas un drenējošas. Kopumā aizkuņģa dziedzera operācijas ir tehniski izaicinošas un augsti invazīvas, līdz ar to asociējas ar nozīmīgu pēcoperācijas komplikāciju risku (53,3 %). Darba mērķis. Retrospektīvi noskaidrot ķirurģiskās ārstēšanas veidus un intra…