Search results for "PES"

Geochemistry and isotope composition (Sr, Pb, δ66Zn) of Vulcano fumaroles (Aeolian Islands, Italy)

2018

We present and discuss temperatures, major and trace element gas geochemistry, radiogenic isotopes (Pb, Sr) and the first Zn isotope data of fumarole condensates and altered rocks from the Vulcano fumarolic field. The fumaroles of the La Fossa cone, sampled on 5th May 2015, have temperatures ranging between 233 and 427 °C. They plot compositionally on the mixing trend between the magmatic and hydrothermal end-members defined by previous studies, but are strongly displaced towards the hydrothermal component. Correlations of radiogenic (Sr, Pb) and stable isotopes of Zn with δ13CCO2 and several trace elements of the fumarolic acid condensates support mixing between the above mentioned distinc…

Isotopically (δ13C and δ18O) heavy volcanic plumes from Central Andean volcanoes: a field study

2017

International audience; Stable isotopes of carbon and oxygen in volcanic gases are key tracers of volatile transfer between Earth's interior and atmosphere. Although important, these data are available for few volcanoes because they have traditionally been difficult to obtain and are usually measured on gas samples collected from fumaroles. We present new field measurements of bulk plume composition and stable isotopes (δ13CCO2 and δ18OH2O+CO2) carried out at three northern Chilean volcanoes using MultiGAS and isotope ratio infrared spectroscopy. Carbon and oxygen in magmatic gas plumes of Lastarria and Isluga volcanoes have δ13C in CO2 of +0.76‰ to +0.77‰ (VPDB), similar to slab carbonate;…

Analisi dell’età in un campione siciliano di volpe (Vulpes vulpes L.).

2008

Zvaigžņotā debess: 2020, Pavasaris (247)

2020

Walkscapes. Un’esperienza professionalizzante a Palermo

2020

In seno al dibattito scientifico disciplinare, da alcuni anni ormai, si va sempre più affermando che il campo degli studi urbani, siano essi finalizzati alla sola pratica della conoscenza o ad un progetto di trasformazione, non può più prescindere da un approccio diretto e pensato per il luogo e nel luogo. Il contributo vuole ragionare attraverso delle esperienze, alcune concluse altre ancora in atto, di ricerca-azione su uno degli approcci che si è rivelato più utile e che ha prodotto risultati molto interessanti nel processo di conoscenza e progettazione dello spazio urbano: la camminata di quartiere. Le esperienze sono nate all’interno delle attività didattiche svolte presso il Corso di …

Walmoo klientu lojalitātes platformas pārvaldes paneļa izstrāde

2022

Kvalifikācijas darba ietvaros ir izstrādāts pārvaldes panelis “Walmoo” klientu lojalitātes platformai. Ar šīs lietotnes palīdzību var pārvaldīt platformā piereģistrētos kontus, to apmeklētājus, apskatīt platformas statistikas datus turpmākai analīzei, kā arī veidot, sūtīt un apskatīt rēķinus. Lietotne pieejama tikai vienam platformā piereģistrētam kontam, kurš ir identificēts kā platformas īpašnieks. Darba mērķis ir izstrādāt jaunu uzlabotu pārvaldes paneļa versiju jau esošajam nepabeigtajam risinājumam. Lietotne ir izstrādāta izmantojot ReactJS satvaru lietotāju saskarnēm ar programmēšanas valodu Typescript, NextJS satvaru, MUI lietotāju saskarnes bibliotēku. Kā arī lietotne ir savienota a…

Partial least squares-near infrared determination of pesticides in commercial formulations

2007

Abstract A solvent free, fast and environmentally friendly near infrared-based methodology (NIR) was developed for pesticide determination in commercially available formulations. This methodology was based on the direct measurement of the diffuse reflectance spectra of solid samples and a multivariate calibration model (partial least squares, PLS) to determine the active principle concentration in commercial formulations. The PLS calibration set was built on using the spiked samples by mixing different amounts of pesticide standards and powdered samples. Buprofezin, Diuron and Daminozide were used as test analytes. Concentration of Buprofezin in the samples was calculated employing a 4-fact…

Application of capillary electrophoresis-mass spectrometry for determining organic food contaminants and residues.

2008

Food contamination continues to be a serious problem around the world. Surveillance of chemical contaminants in foods is important not only for public health but also because of the negative economic impact of contamination. From the analytical perspective, analysis of contaminants in food is an extremely challenging area. There is a wide variety of questions, ranging from the quantification of extremely low levels of individual components to the detailed assessment and evaluation of the analytical technique possibilities. This review considers the applications of CE coupled to MS detection (CE-MS) for the analysis of organic contaminants in food. Analytical information on sample concentrat…

Natural and artificial radioactivity levels in Livingston Island (Antarctic regions).

1994

Radioactive contamination of the sea and land is due, on the one hand, to fallout from atmospheric atomic explosions since 1945, and, on the other, to emissions produced by nuclear and radioactive facilities. Given its geographic position far distant from the aforementioned main sources of radioactive contamination, Antarctica should have the lowest levels that can be measured on the Earth of artificial radionuclides in the various receptor media which are characteristic of the trophic chain. In the case of Antarctica, these are melt-water, sea-water, mosses, algae, and lichens. With the aim of contributing basic information on the radiation levels present in the Antarctic ecosystem, we hav…

Evolution of neodymium isotopic signature of seawater during the Late Cretaceous: implications for intermediate and deep circulation.

2016

20 pages; International audience; Neodymium isotopic compositions (εNd) have been largely used for the last fifty years as a tracer of past ocean circulation, and more intensively during the last decade to investigate ocean circulation during the Cretaceous period. Despite a growing set of data, circulation patterns still remain unclear during this period. In particular, the identification of the deep-water masses and their spatial extension within the different oceanic basins are poorly constrained. In this study we present new deep-water εNd data inferred from the Nd isotope composition of fish remains and Fe–Mn oxyhydroxide coatings on foraminifera tests, along with new εNd data of resid…