Search results for "Amination"
showing 10 items of 1702 documents
Elogio delle contaminazioni “disciplinari”
2021
Il saggio esprime i motivi di condivisione della linea editoriale della rivista, i tre punti cardine che definiscono il profilo teorico di Historia Magistra e che possono così essere riassunti: il fatto di considerare la storia “un diritto fondamentale di tutti gli esseri umani”, la dimensione scientifica dell’approccio storico (e della ricerca sociale in termini più ampi), la celebre frase di Marx per la quale la storia sarebbe “il faro che illumina ogni nostra conoscenza”. In questo caso, è utile rileggere l’affermazione marxiana dentro confini più ampi, sostituendo alla dimensione “disciplinare” (quella che vede, per l’appunto nella storia “una” specifica branca del sapere) la dimensione…
4-Methyl-N-(4-methylpyridin-2-yl)-N-(3,4,5,6-tetrahydro-2H-pyran-4-yl)pyridin-2-amine
2016
In the title compound, C17H21N3O, the pyridine rings make a dihedral angle of 84.44 (5)°. In the crystal, a C—H...N interaction forms a chain of molecules propagating along the twofold screw axis.
Novel 2,6-disubstituted phenylboronic compounds - Synthesis, crystal structures, solution behaviour and reactivity
2015
Abstract 2,6-Diformylphenylboronic acid has been synthesized and characterized both in the solid state as well as in solution. In crystal, an unusual structural pattern has been found with the formation of intermolecular hydrogen bonds by B(OH) 2 and CHO groups as well as water molecules. In solution tautomeric equilibrium with the formation of oxaborole ring by one of the formyl groups was proved on the basis of multinuclear NMR spectroscopy. The title compound reacts with secondary mono- and diamines to form various types of substituted benzoxaboroles, which have been characterized by XRD and spectroscopic methods.
Effect of Multi-Impact on Qiqh Carbon/Epoxy Composite LaminateEffect of Multi-Impact on Qiqh Carbon/Epoxy Composite Laminate
2018
This work is motivated by increasingly used of composite structures under severe loading conditions. During their use, these materials are often subjected to impact as for example, in the aeronautical field the fall of hailstone on structure composites. In fact, the low energy traditional impact tests don’t allow to see the evolution of the damage and don’t permit also to compare the best tolerance to impact between different stratifications. The multi-impact tests made it possible to find a solution to this problem. In this work, multi-impact tests are performed on three carbon/epoxy stratifications. The final goal is to predict the durability of the composite structures during impact load…
Delamination study of Z-pinned composite laminates via two-phase interface model.
2008
One of the most effective technique, developed over the last decade, to enhance the strength of the composite laminates in the thickness direction (z-direction), is the through-thickness reinforcement in form of stitching [2], [4] or short rods inserting [3]. These reinforcing fibres, providing direct closure tractions to the potential delamination crack faces (bridging effect), increase the interlaminar fracture toughness. The reinforcement system can be applied extensively to the composite laminate or restricted to those critical structural zones that are subjected to high interlaminar stresses. The through-thickness reinforcement is also used in composite-composite assemblages where, cou…
Digitaalisen koealustan pilotointi Yleisissä kielitutkinnoissa
2019
Yleiset kielitutkinnot ovat siirtymässä asteittain digitaaliseen muotoon. Tässä artikkelissa esitellään lyhyesti tätä muutosprosessia sekä kerrotaan maahanmuuttajille järjestetystä digitaalisen koealustan pilotoinnista ja sen tuloksista. Pilotti toteutettiin Lahdessa kotoutumiskoulutukseen osallistuvien maahanmuuttajien kielitaidon testauksella. Heidän kielitaitonsa vaihteli kielten yleiseurooppalaisen viitekehyksen tasojen A1 ja B1 välillä. Pilotissa testattiin digitaalisen alustan toimintaa ja käytettävyyttä koulutustaustaltaan hyvin heterogeenisella osallistujajoukolla. Pilotissa haluttiin myös selvittää, vaikuttaako koneella kirjoittaminen kirjoitusnopeuteen ja tuotoksen pituuteen S2-op…
Dietary exposure to mycotoxins through the consumption of commercial bread loaf in Valencia, Spain
2017
Abstract In this study, 80 commercial samples of bread loaves were purchased from different supermarkets located in Valencia (Spain). These samples were investigated for the presence of legislated and non-legislated mycotoxins. Results showed that samples were contaminated with Aflatoxins (AFs), Zearalenone (ZEA) and Enniatins (ENs) with a frequency of 20, 96, and 65% respectively. Aflatoxin B1 (AFB1), Aflatoxin B2 (AFB2) and Aflatoxin G1 (AFG1) were detected with concentrations ranged from 0.5 to 7.1 μg/kg. The samples contaminated with AFB1 showed values exceeding the maximum limit allowed in the EU. The sum of AFs also exceeded the maximum limit allowed in 6 samples. ENs contamination da…
Elemental contamination of an open-pit mining area in the Peruvian Andes
2014
New technologies and higher prices of raw materials have promoted the expansion of mining activity throughout the world; if not properly regulated, this activity can lead to contamination of the local and regional environ- ment. The city of Cerro de Pasco is located close to a large open-pit mine and in recent years, several reports have pro- vided evidence of environmental contamination and related health problems. The aim of this paper is to evaluate the contamination in fluvial water, sediments and biological fluids from this area. The collective results show elevated metal and metalloid concentrations in rivers and sediments, especially in the areas downstream of the mine. For instance,…
<title>Refractive properties of separate erythrocytes of Chernobyl clean-up workers at different pH</title>
2000
This study is focused on the modifications in erythrocytes of Chernobyl nuclear power plant accident clean-up workers as a late health effect of short-term impact of high level radioactive contamination. As a result, a new method based on erythrocyte (RBC) refractive index properties at different pH has been elaborated. According to the light dispersion theory for fluids refractive index is associated with molecules mass m. This feature is widely used for estimation of cell dry mass. But there is another refractive index dependency from molecules charge q regardless of its sing. This feature is not being used for cell quantitative and qualitative characterization. In this study, RBC were in…
The gas chromatography/mass spectrometry can be used for dose estimation in irradiated pork
2009
Abstract Food safety can be improved using ionizing radiation to reduce food spoilage and to extend its shelf life. The gas chromatography/mass spectrometry (GC/MS) has been validated by the European Community as a powerful method to identify irradiated food containing fat. The preliminary goals of our research were: (i) to set up this method, based on the detection of radiation induced 2-dodecylcyclobutanones (2-DCB) in pork muscle samples and (ii) to check the microbiological efficacy of the treatment. The main objective was to render the GC/MS a quantitative technique for dose estimation, through the measurement of the 2-DCB concentration in the irradiated sample. Our results show that t…