Search results for "Note"

Total oxidation of propene at low temperature over Co3O4–CeO2 mixed oxides: Role of surface oxygen vacancies and bulk oxygen mobility in the catalyti…

2008

Liotta, L. F. Ousmane, M. Di Carlo, G. Pantaleo, G. Deganello, G. Marci, G. Retailleau, L. Giroir-Fendler, A.; Co3O4, CeO2 and Co3O4-CeO2 mixed oxides with Co/Ce nominal atomic ratio 0.1:5, prepared by co-precipitation method with sodium carbonate, were tested in the oxidation of propene under lean condition and the catalyst stability was checked by performing three consecutive heating-cooling cycles. Characterization of the textural properties were performed by surface area measurement BET, X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements. Among the Co3O4-CeO2 mixed oxides, Co3O4 (30 Wt%)-CeO2 (70 wt%) gives the best activity attaining full propene conversion at …

Nanotieteen ja -teknologian hyödyntäminen ääreishermostollisessa ylemmän raajan neuroprostetiikassa

2017

Tämä kirjallisuuskatsaus pyrkii luomaan realistisen kuvan tämän hetkisestä neuroprostetiikan alasta ja sen tulevaisuudesta, perehtymään alan ongelmiin, luomaan yhteyden nanoteknologian ja neuroprostetiikan välille ja miettimään miten ja mitä neuroprostetiikan ongelmia voitaisiin ratkaista nanoteknologialla. Suurin ongelma intuitiivisen hallinnan ja sitä kautta luonnollisen tuntuisen keinotekoisen käden saavuttamiseksi on ihmisen ja proteesin välisen yhteyden rajapinta. Nykyiset elektrodit, joilla yhteys muodostetaan ovat hermoston rakenteeseen suhteutettuna suuria ja todellisuudessa epäspesifejä. Nanoteknologian avulla käytettävien elektrodien kokoa voitaisiin pienentää,…

Exploring fast proton transfer events associated with lateral proton diffusion on the surface of membranes

2019

Proton diffusion (PD) across biological membranes is a fundamental process in many biological systems, and much experimental and theoretical effort has been employed for deciphering it. Here, we report on a spectroscopic probe, which can be tightly tethered to the membrane, for following fast (nanosecond) proton transfer events on the surface of membranes. Our probe is composed of a photoacid that serves as our light-induced proton source for the initiation of the PD process. We use our probe to follow PD, and its pH dependence, on the surface of lipid vesicles composed of a zwitterionic headgroup, a negative headgroup, a headgroup that is composed only from the negative phosphate group, or…

Models for quantum dots and rings

2003

Energy level determination of purine containing blue light emitting organic compounds

2018

Organic light emitting diodes (OLED) have found their applications in the mobile and TV screens. Till now the commercially available diodes are made by expensive thermal evaporation in a vacuum. The costs of OLED fabrication could be decreased by applying low-cost wet casting methods, for example, spin-coating. In this work, we have studied a group of blue light emitting purine derivatives which could potentially be used in OLEDs. The advantage of these compounds is their ability to form amorphous thin films from solutions. All the thin films were prepared by the spincoating method from chloroform solution on ITO glass. The position of hole and electron transport energy levels is important …

Pirmslīguma sarunu problemātika ANO Konvencijā par starptautiskajiem preču pirkuma-pārdevuma līgumiem

2016

Darba mērķis ir apzināt potenciālās problēmas, kas izriet no Apvienoto Nāciju organizācijas 1980.gada konvencijas par starptautiskajiem preču pirkuma-pārdevuma līgumiem (turpmāk – CISG) regulējuma un skar pirmslīguma sarunu laiku. Lai to sasniegtu, autore analizēs divus pantus, kuros iespējams saskatīt pirmslīguma sarunu nozīmi – CISG 7. un 8.pantu, pētot, vai CISG 7.pantā ir ietverts regulējums, kas attiecas uz atbildību, kas var izrietēt no pirmslīguma sarunām, kā arī to, kā CISG 8.panta trešajā daļā ietvertais noteikums pielietojams praksē dažādās situācijās, kurās tā pielietošanas iespējamība nav viennozīmīga. Rezultātā autore nonāks pie secinājumiem par CISG 7. un 8.panta saturu, to pi…

Crystal structure of the pyridine–diiodine (1/1) adduct

2015

In the title adduct, C5H5N·I2, the N—I distance [2.424 (8) Å] is remarkably shorter than the sum of the van der Waals radii. The line through the I atoms forms an angle of 78.39 (16)° with the normal to the pyridine ring.

Pyrolytic behavior of lignocellulosic-based polysaccharides

2018

The thermochemical behavior of cellulose, glucomannan, and xylan was investigated by pyrolysis–gas chromatographymass spectrometry (Py-GC/MS). In each case, major GC-amenable condensable products were classified into several compound groups, and the formation of these monomer-related fragments from the model substance samples was determined at 500, 600, and 700 C with a residence time of 5 s and 20 s. The results revealed that despite some general formation trends, no compound group was selectively formed at certain temperatures. Of the 11 product groups, the primary ones, including lactone, furan, and cyclopentenone derivatives, accounted for 72–85% (from cellulose), 86–90% (from glucomann…

Satversmes tiesas ietekme uz pakalpojumu sniedzēja un klientu attiecībām dabasgāzes lietošanas noteikumu pārkāpumu gadījumos.

2022

Maģistra darbs “Satversmes tiesas ietekme uz pakalpojumu sniedzēja un klientu attiecībām dabasgāzes lietošanas noteikumu pārkāpumu gadījumos” ir uzrakstīts Latvijas Universitātes Juridiskās fakultātes Civiltiesisko zinātņu katedrā, studiju programmas “Tiesības un organizāciju pārvaldība” ietvaros. Autore maģistra darbā ir izpētījusi normatīvo aktu regulējumu saistībā ar dabasgāzes lietošanas noteikumu pārkāpšanu, kā arī dabasgāzes tirgus atvēršanas radītos izaicinājumus. Maģistra darba mērķis ir analizēt un noskaidrot Satversmes tiesas spriedumu ietekmi uz dabasgāzes pakalpojumu sniedzēja un klientu attiecībām šajā jomā. Maģistra darba rezultātā secināts, ka tieši Satversmes tiesas spriedum…

Superconducting tunnel junction fabrication on three-dimensional topography based on direct laser writing

2020

Superconducting junctions are widely used in a multitude of applications ranging from quantum information science and sensing to solidstate cooling. Traditionally, such devices must be fabricated on flat substrates using standard lithographic techniques. In this study, we demonstrate a highly versatile method that allows for superconducting junctions to be fabricated on a more complex topography. It is based on maskless direct laser writing and two-photon lithography, which allows writing in 3D space. We show that high-quality normal metal–insulator–superconductor tunnel junctions can be fabricated on top of a 20-lm-tall three-dimensional topography. Combined with conformal resist coating m…