Search results for "doping"

Peruskoulun 6.- ja 9.-luokkalaiset ja doping

1997

Aptiekā pieejamie bezrecepšu medikamenti un uztura bagātinātāji, kas var radīt dopinga efektu

2018

Mūsdienās ļoti aktuāla ir dopinga lietošanas problēma. Uzsvars tiek likts ne tikai uz negodīgu panākumu gūšanu, bet arī poteciālo blakusparādību risku, kas rada draudus sportista veselībai un dzīvībai. Darba mērķis ir iepazīties ar sportā aizliegto vielu un metožu sarakstu, izpētīt aptiekā pieejamo bezrecepšu medikamentu un uztura bagātinātāju sortimentu, terapeitisko devu ietekmi uz dopinga efektu, izzināt speciālistu un sportistu ieinteresētību dopinga lietošanā. Darba ietvaros tika veikta 59 farmācijas speciālistu anketēšana ar mērķi noskaidrot to zināšanas par dopingu saturošiem medikamentiem un ieinteresētību sportistu atbilstošā konsultēšanā. Pētījumā piedalījās arī 10 profesionāli mo…

Cd12Ag32(SePh)36 : Non-Noble Metal Doped Silver Nanoclusters

2019

While there are numerous recent reports on doping of a ligand-protected noble metal nanocluster (e.g., Au and Ag) with another noble metal, non-noble metal (e.g., Cd) doping remains challenging. Here, we design a phosphine-assisted synthetic strategy and synthesize a Cd doped Ag nanocluster, Cd12Ag32(SePh)36 (SePh: selenophenolate), which exhibits characteristic UV–vis absorption features and rare near-infrared (NIR) photoluminescence at ∼1020 nm. The X-ray single crystal structure reveals an asymmetric two-shell Ag4@Ag24 metal kernel protected by four nonplanar Cd3Ag(SePh)9 metal–ligand frameworks. Furthermore, the electronic structure analysis shows that the cluster is a 20-electron “supe…

The impact of TiO2 modifications on the effectiveness of photocatalytic processes [REVIEW]

2018

This paper outlines the recent studies on the application of photocatalysis using semiconductors, with modified titanium dioxide (TiO2) in the process of reducing chemical contamination of surface and ground waters. During the last forty years, an increasing interest in catalysts of this type is noticeable. Hence, a wide range of methods of TiO2 modifications have been proposed so far by using its various polymorphs, composites with metals and non-metals and polymer-coatings or impregnating it with dyes that effectively absorb sunlight.

Nuorten urheilijoiden dopingasenteet ja niihin vaikuttaminen

2005

L’ASSIMILAZIONE IN AMBITO SPORTIVO DELLA SOMMINISTRAZIONE OFF-LABEL AL DOPING, SPUNTI GIURIDICI ED ETICI

2015

This paper offers an analysis about the issue of off-label drugs use in Italy, focusing on the sport area and on the role of the State. In particular interconnections and divergences with anti-doping regulation will be addressed, making some reflections about the partial lack of regulation.

Copper Induces a Core Plasmon in Intermetallic Au(144,145)–xCux(SR)60 Nanoclusters

2015

The electronic structure and optical absorption spectra of intermetallic thiol-stabilized gold-copper clusters, having 144-145 metal atoms and 60 thiols, were studied by ab initio computations. The widely known icosahedral-based cluster model from the work of Lopez-Acevedo et al. (2009) was used, and clusters doped with one to 30 copper atoms were considered. When doped inside the metal core, copper induces dramatic changes in the optical spectrum as compared to the previously studied all-gold Au144(SR)60. An intense broad absorption peak develops in the range 535-587 nm depending on the amount of doping and doping sites. This result agrees very well with recent experiments by the Dass grou…

Radioluminescence Response of Ce-, Cu-, and Gd-Doped Silica Glasses for Dosimetry of Pulsed Electron Beams

2021

Radiation-induced emission of doped sol-gel silica glass samples was investigated under a pulsed 20-MeV electron beam. The studied samples were drawn rods doped with cerium, copper, or gadolinium ions, which were connected to multimode pure-silica core fibers to transport the induced luminescence from the irradiation area to a signal readout system. The luminescence pulses in the samples induced by the electron bunches were studied as a function of deposited dose per electron bunch. All the investigated samples were found to have a linear response in terms of luminescence as a function of electron bunch sizes between 10−5 Gy/bunch and 1.5×10−2 Gy/bunch. The presented results show that these…

O2-Loading Treatment of Ge-Doped Silica Fibers: A Radiation Hardening Process

2016

International audience; The effects of a high-pressure O2-loading treatment on the radiation response of Ge-doped optical fibers (OFs) were investigated. We found that the incorporation of high concentration of interstitial molecular oxygen remarkably enhances the resistance to ionizing radiation of Ge-doped OFs in the UV-Visible domain and, at the same time, improves the transmission of UV light in the unirradiated OF sample. By comparison with previously reported results, the O2-loading treatment turned out to increase the radiation resistance of Ge-doped OFs more efficiently than F or Ce codoping. The understanding of such amelioration relies in basic radiation-induced mechanisms that we…

Origins of radiation-induced attenuation in pure-silica-core and Ge-doped optical fibers under pulsed x-ray irradiation

2020

We investigated the nature, optical properties, and decay kinetics of point defects causing large transient attenuation increase observed in silica-based optical fibers exposed to short duration and high-dose rate x-ray pulses. The transient radiation-induced attenuation (RIA) spectra of pure-silica-core (PSC), Ge-doped, F-doped, and Ge + F-doped optical fibers (OFs) were acquired after the ionizing pulse in the spectral range of [∼0.8–∼3.2] eV (∼1500–∼380 nm), from a few ms to several minutes after the pulse, at both room temperature (RT) and liquid nitrogen temperature (LNT). Comparing the fiber behavior at both temperatures better highlights the thermally unstable point defects contribut…