Search results for "structures"
showing 10 items of 4815 documents
Deterministic Modification of CVD Grown Monolayer MoS2 with Optical Pulses
2021
| openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/834742/EU//ATOP Transition metal dichalcogenide monolayers have demonstrated a number of exquisite optical and electrical properties. Here, the authors report the optical modification of topographical and optical properties of monolayer MoS2 with femtosecond pulses under an inert atmosphere. A formation of three-dimensional structures on monolayer MoS2 with tunable height up to ≈20 nm is demonstrated. In contrast to unmodified monolayer MoS2, these optically modified structures show significantly different optical properties, such as lower photoluminescence intensity and longer fluorescence lifetime. The results suggest a novel way…
The muqarnas ceiling of the Palatina Chapel in Palermo
2018
St. Peter’s Basilica inside the Royal Palace of Palermo, known as the Palatina Chapel, is one of the most popular medieval monuments in Sicily. Built between 1130 and 1163, it contains interesting wooden framings that represent both bearing and finishing structures. Studies about the Arab-Norman church have often concentrated on the very rich and suggestive decorative mosaic apparatus of walls and floorings, as well as the pictorial cycle of wooden ceilings. Knowledge about the constructive techniques adopted and, in particular, about the realization of the coverings, is very limited: there are wooden floors built at different levels, vaults and wooden ceilings and among these is the portio…
Polyseeminen "vaikka" ja neuvottelun retoriikka / Polysemic forms of "vaikka " and the rhetoric of negotiation
2006
Polysemic forms of vaikka and the rhetoric of negotiation (englanti) 2/2006 (110) Polysemic forms of vaikka and the rhetoric of negotiation The article analyses the use of the Finnish lexeme vaikka ([al]though but also even if, say, for example and on the other hand, indeed) in spoken Finnish, and especially in certain planning and negotiating situations. The forms in which this lexeme occur are described as facilitators of argumentation based on concessiveness. The writer applies the cardinal concessive schema of Couper-Kuhlen and Thompson (2000): In negotiations this schema is used to modify, weaken or contradict statement X and to confirm counter statement Y. The writer hypothesises that…
Sensitivity of different early developmental periods of Baltic herring (Clupea harengus) to water-accommodated fraction of crude oil
2013
The probability for the oil accident to occur at the Gulf of Finland has been increasing last ten years and it is predicted to continue so. The risk is high based on the accident probability and the probable harm caused; some spawning areas of the Baltic herring (Clupea harengus membras) are located in the vicinity of ports and ship fairways with heavy traffic, so any oil spillage there could affect recruitment of this commercially important species. In this study, newly fertilized embryos, the older embryos and the hatched larvae of Baltic herring were exposed to water-accommodated fraction (WAF) made from crude oil. Oil exposure increased most the mortality of the hatched larvae, and larv…
Syntactic Criterial Features in Assessing Written Performance in English and French
2014
Promocijas darba „Sintaktiskās kriteriālās pazīmes angļu un franču valodas rakstveida snieguma vērtēšanā” teorētiskajā daļā tiek analizētas dažādas pieejas valodas vienību apguves izpētē, kā arī aktualizēti galvenie principi rakstveida snieguma vērtēšanā un rezultātu pielīdzināšanā Eiropas kopīgajām pamatnostādnēm. Pamatojoties uz mūsdienu deskriptīvajās gramatikās lietoto angļu un franču valodas sintaktisko struktūru kontrastīvās analīzes rezultātiem, promocijas darba empīriskajā daļā tiek veikta angļu un franču valodas apguvēju lietoto sintakstisko struktūru kvantitatīvā un kvalitatīvā analīze. Iegūtie dati tiek izmantoti, lai izstrādātu katram valodas apguves līmenim (A1 – C2) atbilstoša…
Phase-Sensitive Detection for Optical Sensing With Porous Silicon
2012
We report on a photonic sensor with an ultralow limit of detection (LoD) based on a phase interrogation readout scheme together with an anisotropic porous silicon (PSi) membrane. First, the fabrication of porous free-standing membranes from medium doped (100) surface oriented silicon, with pore diameters suitable for the infiltration of biomolecules, around 50 nm, is reported. Then, the phase interrogation scheme for characterizing the PSi membranes is presented whose results show that while volumetric sensitivity increases with the membrane thickness, the resolution in the birefringence measurements decrease dramatically due to depolarization effects. The best LoD was found to be equal to …
A pH Study for the Degradation of Acetaminophen with Iron Oxide Nanostructures
2019
[EN] Nowadays, there is an increasing interest in the degradation of organic compounds in wastewater, since they are detrimental for the water quality. Different metal oxides have been studied as photocatalysts in the photoelectrocatalytic degradation of pharmaceutical products using UV light. Iron oxide nanostructures are a promising option in this field since their band gap (~ 2.1 eV, corresponding to ~590 nm) can absorb visible light, which in turn allows the degradation by using sunlight. Iron oxide nanostructures are known to be stable in alkaline solutions, but some organic compounds can vary their structure with pH. Then, a pH study is needed in order to stablish the optimum value to…
Nickel-Indium Sulphide Core-Shell Nanostructures Obtained by Spray-ILGAR Deposition
2013
Ni nanowires (NWs) of different lengths were fabricated by pulsed potentiostatic deposition within pores of polycarbonate membranes. After template dissolution, substrates underwent sequential Spray-ILGAR (R) depositions of thin indium sulphide films. The effect of deposition temperature was also investigated. For low number of deposition cycles, results showed complete and uniform covering of metal over the entire length of NWs, with formation of Ni - In2S3 core-shell structures. However, with increasing number of deposition cycles films became uneven and crusty, especially at higher temperatures, owing to the simultaneous formation of nickel sulfide. This drawback was almost eliminated do…
Nanostructured anode material for Li-ion battery obtained by galvanic process
2016
This work focused on the synthesis and characterization of nanostructured lead hydroxide chloride (PbOHCl) that is an innovative anode material for lithium-ion batteries (LIBs). In particular, we have obtained nanostructures of mixed PbOHCl and lead metal, directly into the pores of a commercially available alumina membrane, acting as template. The process was based on galvanic displacement reaction that was carried out in a two-compartment electrochemical cell without the use of an external power supply. This simple and cheap procedure gives regular array of Pb/PbOHCl composite nanowires. To obtain nanostructured electrodes is a significant result because, it’s well known that nanostructur…
Electrodeposition and characterization of Mo oxide nanostructures
2015
Template electrodeposition has been used to grow uniform arrays of molybdenum oxide nanostructures in polycarbonate membrane. Several parameters have been investigated, like electrodeposition, time and solution pH. These parameters do not influence the nature of the deposit that always consists of mixed valence molybdenum oxides, whereas the nanostructure morphology changes with pH. In particular, at low pH (2.7), nanotubes are formed, whilst arrays of nanowires are obtained above pH 5.5. This change of morphology is likely due to H2 bubbles evolution during the electrochemical deposition, particularly occurring at low pH. It was found that fast removal of H2 bubbles through vigorous stirri…