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  Etapa 2 - P1 2016 | Ins...  
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In lucrarea de fata utilizam formalismului Maxwell-Bloch generalizat (C. Weninger and N. Rohringer, PRA 90, 2014) pentru a simula amplificarea radiatiei intr-o coloana de plasma obtinuta prin ionizarea gazului de neon cu radiatia XFEL conform experimentului publicat in 2012.
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In the present work we make use of the generalized Maxwell-Bloch approach (C. Weninger and N. Rohringer, PRA 90, 2014) in order to simulate the amplification of radiation within a plasma column resulting from the photo-ionization of the neon gas performed with the help of the XFEL pulse similar to the experiment performed in 2012. The spontaneous emission is modeled using a stochastic term characterized by a correlation function which reproduces the correct Lorentian line-shape of the transition. The numerical simulation of the amplification process allows spatial and temporal monitorization of the population inversion, laser gain, laser pulse (temporal profile, brightness, duration, frequency band) and pumping radiation attenuation along its propagation in the lasing medium.
  Etapa 1 - P4 2016 | Ins...  
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Tratarea cu plasma combinata cu ozonizare (cu O3 format in plasma) s-a dovedit eficienta pentru degradarea MeP. Poluantul (cu o concentratie initiala 50 mg/L) este complet eliminat dupa 15 min de tratare, iar constanta de rata este dubla fata de ozonizare.
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The results obtained in this study provide insight into the chemical reactions of the oxidants generated in electrical discharges in contact with liquid with an organic pollutant (methyl paraben - MeP). Plasma treatment combined with ozonation (using O3 formed in plasma) proved effective for MeP degradation. The pollutant (initial concentration 50 mg/L) was completely eliminated after 15 minutes treatment, and the reaction rate constant is two times higher as compared to ozonation. Mineralization was also substantial in the plasma+O3 configuration: 66.5% of the total organic carbon was removed after 60 minutes treatment. Although O3 significantly accelerated MeP removal as compared to plasma treatment alone, other oxidants generated in plasma (mainly ●OH radicals) also have an essential contribution to the degradation of pollutant and to mineralization. Less ●OH radicals were detected in the MeP solution than in pure water, due to their consumption in reactions with MeP and its degradation products. The amount of H2O2 accumulated in the liquid was also influenced by the presence of MeP: depending on the concentration of organic compound, either the formation of H2O2 or its decomposition in reactions with ●OH or O3 is affected.
  Etapa 2 - P3 2016 | Ins...  
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Abstract: Raportul de fata descrie efectele co-dopantilor heterovalenti asupra proprietatilor structurale si de emisie ale nanoparticulelor de CeO2 dopate cu ioni de Er. Gazda de CeO2 a fost selectata datorita proprietatilor relativ bine cunoscute in stare nedopata si dopata cu elemente metalice trivalente dar si potentialului pe care il are in aplicatii de biomedicina.
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Abstract: We investigate the effects of heterovalent co – dopants on the structural and emission properties of 1% Er - CeO2 nanoparticles. The CeO2 oxide host was selected on the basis of its fairly well understood defect chemistry in either pure or doped state. As a luminescent activator, Er is acknowledged as an interesting one due to its rich luminescence and excitation properties spanning visible to near- infrared range. The optically inactive trivalent La and monovalent Li metal ions with concentration of up to 20 % were chosen to presumably generate a variable amount of defects into the Er - CeO2 lattice. It was found that La and Li co – dopants induced distinct changes related to size, lattice constant, bandgap energy, lattice and surface defects of Er - CeO2. As a result of these changes, a strong modulation of the luminescence intensity and shape was measured using a suite of excitation conditions (charge - transfer absorption band of CeO2, direct/up-conversion into Er absorptions and X-ray excitation modes). The use of Eu as a luminescent probe offered additional information concerning the effects of La/Li co – doping on the local structure surrounding the luminescent activator. A remarkably high percentages of 90 and 98% of the total emission of Er measured between 500 and 1000 nm is measured in the near – infrared at 980 nm under X - ray and up – conversion excitation at ~ 1500 nm, respectively. The optical properties suggest that Li, Er co - doped CeO2 has a good potential for therapy and biological imaging.
  Etapa 1 - P4 2016 | Ins...  
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Tratarea cu plasma combinata cu ozonizare (cu O3 format in plasma) s-a dovedit eficienta pentru degradarea MeP. Poluantul (cu o concentratie initiala 50 mg/L) este complet eliminat dupa 15 min de tratare, iar constanta de rata este dubla fata de ozonizare.
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The results obtained in this study provide insight into the chemical reactions of the oxidants generated in electrical discharges in contact with liquid with an organic pollutant (methyl paraben - MeP). Plasma treatment combined with ozonation (using O3 formed in plasma) proved effective for MeP degradation. The pollutant (initial concentration 50 mg/L) was completely eliminated after 15 minutes treatment, and the reaction rate constant is two times higher as compared to ozonation. Mineralization was also substantial in the plasma+O3 configuration: 66.5% of the total organic carbon was removed after 60 minutes treatment. Although O3 significantly accelerated MeP removal as compared to plasma treatment alone, other oxidants generated in plasma (mainly ●OH radicals) also have an essential contribution to the degradation of pollutant and to mineralization. Less ●OH radicals were detected in the MeP solution than in pure water, due to their consumption in reactions with MeP and its degradation products. The amount of H2O2 accumulated in the liquid was also influenced by the presence of MeP: depending on the concentration of organic compound, either the formation of H2O2 or its decomposition in reactions with ●OH or O3 is affected.
  Etapa 2 - P3 2017 | Ins...  
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Rezumat: Raportul de fata contine studiile noastre privind luminescenta relevanta din punct de vedere biologic a nanoparticulelor dopate cu lantanide pentru aplicatii in teranostica si senzori de temperatura.
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Abstract: This report contains our studies on biologically relevant luminescence of lanthanide doped nanoparticles aiming at applications in theranostics and temperature sensing. Near-infrared luminescence around 980 and 1500 nm was obtained under X-ray and optical excitation in several lanthanide doped oxide hosts, such as CeO2, Y2O3 and Lu2O3 and Gd2O2S. We have also obtained “quasi” persistent luminescence of Eu and Sm in SnO2 with emission lifetimes of the order of tens of ms. We present also first report on the luminescence thermometry properties of Er, Yb doped Gd2O2S microparticles under near infrared up-conversion excitation around 980 and 1500 nm measured in the 280 to 800 K interval. The thermometry properties are assessed using both cw and ns pulsed excitation as well as tuning the excitation wavelength across Yb and Er absorption profiles. Although for 1500 nm excitation, the temperature sensitivity is lower (~0.008 % K-1), our data represent a first step for opening the thermometry applications of this material at two biologically relevant near-infrared excitation ranges. All nanoparticles have been extensively optimized by using multiple strategies: co-doping with monovalent ions (Li), modifying the concentration of the dopant activator (Er: 0.3 ÷ 7%), use of a sensitizer co-dopant (20% Yb) and varying the anneal temperature. We have also shown that the emission enhancement by Li addition in Ln, Li−Y2O3 is due to improved crystallization and not to local structure distortion. Our results have been published in four ISI journals: (1) J. Phys. Chem. C. (2017) 121 (26), 14274–14284, (2) Sci. Rep. (2017) 7 (1) 9598, (3) Methods Appl. Fluoresc. (https://doi.org/10.1088/2050-6120/aa9ef9) and (4) and J. Alloys Compd. (2017) 711, 627-636.