Search results for "ICR"

showing 3 items of 23903 documents

Photoluminescence properties of S2 molecule trapped in Melanophlogite

2015

We studied the photoluminescence properties of a sample of SiO2-clathrate Melanophlogite, a crystalline microporous material which is found in nature as a rare mineral. Upon β irradiation, the material displays an intense light emission under near-UV illumination. We studied in detail this optical activity by steady-state and time-resolved photoluminescence measurements as a function of temperature. The spectroscopic properties we find can be ascribed to a population of quasi-free molecules trapped within each of the two different types of cage available in the structure of this clathrate, although the spectroscopic properties of the guest molecules are affected by their interactions with t…

β IrradiationPhotoluminescenceClathrate hydratePopulation02 engineering and technologyengineering.material010402 general chemistry01 natural sciencesGeochemistry and PetrologyMoleculeGeneral Materials ScienceClathrateeducationPhotoluminescenceeducation.field_of_studyS2 moleculeChemistryMicroporous material021001 nanoscience & nanotechnology0104 chemical sciencesChemical physicsMelanophlogiteMelanophlogiteExcited stateengineeringLight emissionMaterials Science (all)Atomic physics0210 nano-technology
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Characterization and antimicrobial activity of the volatile components of the flowers of Magydaris tomentosa (Desf.) DC. collected in Sicily and Alge…

2014

The essential oils of the flowers of Magydaris tomentosa (Desf.) DC. (Apiaceae) collected in Sicily (MSi) and Algeria (MAl), respectively, were obtained by hydrodistillation, and their compositions were analysed. The analyses allowed the identification and quantification of 23 components in MSi and 60 compounds in MAl, respectively, showing a very different profile in the composition of the two populations. The main components of MSi were cembrene (28.2%), α-springene (17.5%) and β-springene (14.8%), also present in MAl but in lesser amount (0.4%, 1.8% and 0.9%, respectively), whereas the principal constituents of MAl were (E)-nerolidol (35.4%), α-costol (13.3%) and β-costol (6.8%). Both MS…

β-springeneFlowersMicrobial Sensitivity TestsPlant ScienceBiochemistryMagydaris tomentosaGas Chromatography-Mass Spectrometryessential oilAnalytical ChemistryAnti-Infective Agentsα\-springeneStaphylococcus epidermidisparasitic diseasesOils VolatileMagydarisSicilyApiaceaeantimicrobial activitybiologyTraditional medicineOrganic ChemistrySettore CHIM/06 - Chimica Organicabiology.organism_classificationAntimicrobialαspringeneAnti-Bacterial AgentsPlant LeavesChemotaxonomyAlgerialipids (amino acids peptides and proteins)Composition (visual arts)DiterpenesAntibacterial activitySesquiterpenesApiaceae
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High frequency data entry: statistical findings at high frequency

2010

We introduce some of the most common types of high-frequency financial data: tick-by-tick data, trade andquote data, order bookdata, andmarket member data. We describe the types of variables that are usually available in the most popular high-frequency financial databases. We discuss the issues related to the handling of these data, including cleaning protocols, timing issues, and issues related to data size. We then briefly consider the issues related to the stylized facts detected in the empirical analysis of high- frequency data. Specifically, we consider (i) the irregular temporal spacing of the events at high frequency and its relevance for the econometric modeling of financial variables, (…

financial markets high-frequency data data analysis tick-by-tick data order bookdata market microstructure econophysicsSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)
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