Search results for "OLT"
showing 10 items of 5524 documents
Electrochemical sensor for phosphate ions based on laser scriber reduced graphene oxide
2022
This preliminary work shows a new and innovative way to produce laser scribed reduced graphene oxide (LSGO) electrodes using different porous substrates (ranging from paper to plastic and fabric). The obtained electrodes were also tested as electrochemical sensors towards the detection of phosphate ions in water. To obtain the electrodes, a water suspension of GO was filtered on top of substrate (such as Whatman® filter paper) and a complete sensor was obtained from its reduction using a CO2 laser. The electrode is composed of working and counter electrodes made of LSGO and a reference electrode of a Ag/AgCl obtained by using a commercial AgCl conductive paste. Phosphate ions were detected …
Micro-determination of dithiocarbamates in pesticide formulations using voltammetry
2013
Abstract The purpose of this work was to develop a reliable method for the micro-determination of dithiocarbamates (mancozeb, maneb, propineb, nabam, Na(CH3)2DTC, zineb, ziram, ferbam and thiram) in pesticide formulations for agriculture using adsorptive stripping voltammetry (AdSV). The accuracy of analytical method was valued by analyzing simulate formulation samples prepared by us with known amounts of active ingredients. In addition, the applicability of the AdSV procedure for the analysis of DTCs and EBDTCs in micro-samples was evaluated by estimating its recoveries from spiked commercial formulate samples. The accuracy, valuated as recovery percentage ranged between 85% and 97%. The p…
Voltammetric determination of platinum in perfusate and blood: Preliminary data on pharmacokinetic study of arterial infusion with oxaliplatin
2012
Abstract Because Platinum Group Elements have found widespread use in catalytic converters in cars and as chemotherapeutic agent, interest in the development of reliable analytical methods is carried out in order to monitor these analita in humans to protect the citizen's health. Considering that information on the levels of many trace elements in biological matrices is scarce and for many non-essential elements, baseline levels in the population, and especially in those particularly exposed to the risk are lacking, in this paper we optimize an analytical method for biological matrices, using a voltammetric technique to measure the concentration of Pt in blood and perfusate. The amount of P…
Quantification of Platinum in Edible Mushrooms Using Voltammetric Techniques
2021
Edible mushrooms are a food source with interesting nutritional values. The chief objective of this research was to develop a consistent method for the quantitative ultra-trace analysis of Pt in mushrooms, which is complex because it cannot be readily quantified by common analytical procedures. This research is one of the first analytical methods to establish Pt amount in these vegetables. In this research, 28 different edible mushroom samples from Italy were investigated. Determination of Pt in mushrooms was completed using Differential Pulse Voltammetry (DPV). In this study, we applied the standard addition method because there are no certified reference mushrooms containing platinum grou…
Modellazione numerica del comportamento meccanico delle volte catalane
2010
Il presente lavoro riguarda la modellazione numerica del comportamento costitutivo delle cosiddette volte in foglio (le bóvedas tabicadas) che rappresentano una delle tecniche edilizie tradizionali catalane più diffusamente impiegate da alcuni tra i più grandi architetti spagnoli (primo fra tutti Gaudí) alla fine del XIX secolo [1-3]. Tali volte risultano fondamentalmente costituite da strati alternati di spessore in generale pressoché uguale di mattoni e di malta. Questa particolare caratteristica viene studiata in questo lavoro nel quale si vuole confrontare la modellazione del comportamento costitutivo considerando il materiale come ideale omogeneo con quella ottenuta modellando il mater…
Analisi numerica e sperimentale sul comportamento meccanico delle volte catalane
2008
L'utilisation de la pierre ponce volcanique dans la construction de voûtes en Sicile au début de l’âge moderne
2016
La stereotomia della pietra applicata alla costruzione di volte ha in Sicilia una lunga tradizione, documentata a partire dal tempo della dominazione normanna nell’isola (XI-XII secolo). Tale pratica costruttiva prosegue nei secoli successivi, con momenti di apice nella qualità del taglio stereotomico nelle architetture federiciane (prima metà del XIII secolo), un successivo scadimento nel corso del XIV secolo, e il ritorno a una fertile stagione di sperimentazione a partire dal Quattrocento, sotto l’impulso impresso al cantiere locale dall’arrivo di modelli e maestri dalla penisola iberica (soprattutto da Barcellona, Valencia e Palma di Maiorca). Questa lunga tradizione prosegue ancora nel…
Volte tabicadas nelle grandi isole del Mediterraneo: Sicilia e Sardegna (XV-XVIII secolo)
2012
Allo stato attuale delle ricerche le volte"tabicadas" costituiscono per la Sicilia e la Sardegna una scoperta recente, troppo episodici risultano oggi i casi conosciuti. Paradossalmente sono le fabbriche più precoci, tutte in Sicilia (torre di Pozzallo, castello di Butera, convento di Santa Maria di Gesù a Modica), quelle che presentano minori difficoltà storiografiche, poichè direttamente collegabili a committenti catalani e quindi a esperienze costruttive di importazione. Più problematici appaiono gli esempi in importanti edifici civili della Palermo del Settecento e individuabili anche attraverso le fonti notarili. Altrettando si può dire per cosiddetti "ladrillos de boveda"documentati i…
E-health systems in digital environments
2019
As we live in the digital world, people can be provided with more effective treatment methods that allow them to live longer in their home and to live there better. People can be provided with better home care and preventive health care. People can easily carry portable sensors and intelligent devices in their bodies and wrists that relay their vital information to hospital systems in real time, from which healthcare staff can track human vitality even in real time. Although the digital world offers good opportunities to improve healthcare systems and make disease analyses more effective, we must look deeper about that issue. Devices and systems may not work well together. Almost every manu…
Omahoitajan ja omaisen välinen vuorovaikutussuhde
2014
Tämän pro gradu -tutkielman aiheena oli omahoitajan ja omaisen välinen vuorovaikutussuhde, joka toteutuu ympärivuorokautista hoitoa tarvitsevien iäkkäiden ihmisten hoitokodissa. Tavoitteena oli kuvailla ja ymmärtää omahoitajan ja omaisten välisen vuorovaikutussuhteen ominaispiirteitä ja vuorovaikutussuhteeseen kohdistuvia odotuksia ja toiveita. Tutkimus oli laadullinen ja sen aineisto kerättiin haastattelemalla kuutta omahoitajaa ja kuutta omaista. Haastattelut olivat muodoltaan yksilöteemahaastatteluja, ja ne analysoitiin laadullisen aineiston luokittelumallin mukaisesti. Tutkimuksen tulosten mukaan omahoitajan ja omaisen välisen vuorovaikutussuhteen ominaispiirteitä ovat kasvokkaisuus, vä…