Search results for "Elements"

Using the Trace Element Contents in Bronchoalveolar Lavages to Probe the Human Exposure to Inhaled Particulates

2013

Explosive volcanic eruptions eject large volumes of high surface area, metal-rich dust and ash into the atmosphere. In areas near major volcanic eruptions, humans often interact with these materials and may bioaccumulate heavy and toxic metals. To evaluate these interactions, we examine bronchoalveolar lavage samples (BAL) collected from people exposed to the paroxysmal 2001 Etna eruption. BAL samples reveal a strong enrichment of many toxic heavy metals and the capacity for trace elements released from inhaled particles to induce crystallisation of phosphatic microcryst biominerals in intraaveolar spaces. BAL rare earth element (REE) concentration patterns normalised to shale reveal a ‘V-s…

Comparison between the MHFEM formulation and a 2nd spatial order FV formulation of the linear ground problem

2008

Comparison of different 2nd order formulations for the solution of the 2D groundwater flow problem over irregular triangular meshes

2009

Mixed and Mixed Hybrid Finite Elements (MHFE) methods have been widely used in the last decade for simulation of groundwater flow problem, petroleum reservoir problems, potential flow problems, etc. The main advantage of these methods is that, unlike the classical Galerkin approach, they guarantee local and global mass balance, as well the flux continuity between inter-element sides. The simple shape of the control volume, where the mass conservation is satisfied, makes also easier to couple this technique with a Finite Volume technique in the time splitting approach for the solution of advection-dispersion problems. In the present paper, a new MHFE formulation is proposed for the solution …

Wooden, gypsum and cork floor in the Sicilian construction tradition

2014

This presentation deals with a part of a wider and more complex outline of the Sicilian construction tradition characterised by the presence of gypsum technologies. Gypsum is a very common material used in the island for the realisation of all building elements; its use is commonly spread throughout Sicily thanks to several and wide superficial out crops located in some parts of the island that make this material very easy to find. This presentation is particularly focused on wooden and gypsum floors found and analysed during searches and surveys in the regional area. Outline on criteria for some consistent and appropriate consolidation and restoration interventions are here proposed.

Il bugnato a punta di diamante in Sicilia tra XV e XVI secolo

2009

Diamond shaped bosses in 15th and 16th century in Sicily Diamond shaped bosses are to be found in many Sicilian buildings dating from the 15th and 16th centuries, whether as a means of covering extensive surfaces or, not less significantly, as a decorative element in doorways, windows and niches inside the spandrels supporting domes, both in religious and civil architecture. This study takes into account certain stylistic and constructive aspects in a number of buildings, such as the shape and dimension of the pieces, the way they are placed, the materials employed; these details, together with the dates of construction, make it possible to observe differences and similarities, and (especia…

Chemical-physical parameters, major, minor and trace elements composition of thermo-mineral groundwaters of Greece

2022

This dataset comprises samples of thermo-mineral waters collected by the same team over the period from October 2004 to March 2020 and analysed in the same laboratory. Samples were collected on the whole territory of Greece.

Protonus vadošu uz Nafion polimēra balstītu kompozītmateriālu sintēze un pētījumi izmantošanai degvielas šūnās

2015

Kurināmā elementi izraisa lielu interesi, jo ļauj pārveidot degvielu (piemēram, ūdeņradi, metanolu, metānu) bez Karno cikla ierobežojumiem, sasniedzot augstu lietderības koeficientu. Polimēru elektrolīts ļauj izveidot kurināmā elementu, kas strādā pie pietiekami zemām temperatūrām, optimālām izmantošanai portatīvo enerģijas avotu un autotransporta jomās. Izstrādājot šo darbu, uz protonus vadošā polimēra (Nafions) bāzes sintezēti jauni paraugi, pievienojot polimēram oksīdus, kas ļauj uzlabot materiāla spējas vadīt protonus pie paaugstinātām temperatūrām un relatīvā mitruma zem 100%. Tika veikti sintezēto materiālu fizikālķīmisko īpašību pētījumi, tādi kā: termogravimetrijas analīze, impedanc…

Air Quality Assessment by the Determination of Trace Elements in Lichens (Xanthoria calcicola) in an Industrial Area (Sicily, Italy)

2022

This study provides data on variation in the content of metals and metalloids measured in the lichens (Xanthoria calcicola Oxner) collected in the Syracusan petrochemical complex (Sicily, Italy) which is considered one of the largest in Europe. Concentrations of eighteen trace elements measured in the lichens that were collected from 49 different points were analyzed using an inductively coupled plasma (ICP-MS) device. The concentrations of the typical elements of industrial emissions (As, Cr, Ni, and V) highlight the environmental criticality that exists in the study area. The interpretation of the data in terms of multi-element statistical analysis (FA) and enrichment factor (EFs) proved …

Multi-channel receptors based on thiopyrylium functionalised with macrocyclic receptors for the recognition of transition metal cations and anions.

2010

We report herein the synthesis and characterization of a family of ligands containing different cation binding sites covalently connected to a thiopyrylium signalling reporter. The receptors L1–L6 are able to signal the presence of certain metal cations via three different channels; i.e. electrochemically, fluorogenically and chromogenically. An acetonitrile solution of L1–L6 shows a bright blue colour due to a charge-transfer band in the 575–585 nm region. The colour variation in acetonitrile of L1–L6 in the presence of the metal cations Ag+, Cd2+, Cu2+, Fe3+, Hg2+, Ni2+, Pb2+ and Zn2+ has been studied. A selective hypsochromic shift of the blue band was found for the systems L4-Pb2+ and L…

Mācīšanās darbavietā Solvay Business Services Latvia

2019

Maģistra darba „Mācīšanās darbavietā Solvay Business Services Latvia” autore ir Lāsma Saliņa. Darba apjoms ir 81 lappuses. Tajā ir izmantotas 5 tabulas; 30 attēli; 62 literatūras avoti un 5 pielikumi. Šī darba mērķis ir izpētīt, kā Solvay Business Services Latvia (turpmāk tekstā- SBS Latvia) darbinieki uztver mācīšanos darbavietā un kādas ir viņu vajadzības šajā jautājumā. Darbam izvirzīti šādi uzdevumi: 1. Analizēt teoriju atbilstoši izvēlētajai tēmai un sagatavot analīzes rezultātu pārskatu; 2. Veikt uzņēmuma darbinieku aptauju un interviju; 3. Apkopot, analizēt un raksturot iestādē veikto apsekojumu rezultātus; 4. Izdarīt secinājumus. Lai varētu izvērtēt mācīšanos darbavietā tika izstrād…