The Effect of Femtosecond Laser Irradiation and Plasmon Field on the Degree of Conversion of a UDMA-TEGDMA Copolymer Nanocomposite Doped with Gold Nanorods

In this work, the effects of femtosecond laser irradiation and doping with plasmonic gold nanorods on the degree of conversion (DC) of a urethane dimethacrylate (UDMA)–triethylene glycol dimethacrylate (TEGDMA) nanocomposite were investigated. The UDMA-TEGDMA photopolymer was prepared in a 3:1 weight ratio and doped with dodecanethiol- (DDT) capped gold nanorods of 25 × 75 or 25 × 85 nm nominal diameter and length. It was found that the presence of the gold nanorods alone (without direct plasmonic excitation) can increase the DC of the photopolymer by 6–15%. This increase was found to be similar to what could be achieved with a control heat treatment of 30 min at 180 °C. It was also shown that femtosecond laser impulses (795 nm, 5 mJ pulse energy, 50 fs pulse length, 2.83 Jcm−2 fluence), applied after the photopolymerization under a standard dental curing lamp, can cause a 2–7% increase in the DC of undoped samples, even after thermal pre-treatment. The best DC values (12–15% increase) were obtained with combined nanorod doping and subsequent laser irradiation close to the plasmon resonance peak of the nanorods (760–800 nm), which proves that the excited plasmon field can directly facilitate double bond breakage (without thermoplasmonic effects due to the short pulse length) and increase the crosslink density independently from the initial photopolymerization process.publishedVersio

Inclusive distributions of charged hadrons in pppp collisions at s\sqrt{s} = 0.9 and 2.36~TeV

Measurements of inclusive charged-hadron transverse-momentum ($p_T$) and pseudorapidity ($\eta$) distributions are presented for proton-proton collisions at $\sqrt{s}=$~0.9 and 2.36~TeV. For non-single-diffractive interactions, the average $p_T$ of charged hadrons is measured to be $0.46 \pm 0.01$~(stat.)~$\pm$~0.01~(syst.)~GeV/$c$ at 0.9~TeV and $0.50 \pm 0.01$~(stat.)~$\pm$~0.01~(syst.)~GeV/$c$ at 2.36~TeV, for $-2.4<\eta<+2.4$. At these energies, the measured pseudorapidity densities in the central region, $dN_{\rm ch}/d\eta_{-0.5< \eta < 0.5}$, are $3.48 \pm 0.02$~(stat.)~$\pm$~0.13~(syst.) and $4.47 \pm 0.04$~(stat.)~$\pm$~0.16~(syst.), respectively. The results at 2.36~TeV represent the highest-energy measurements ever published at a particle collider at the time of the presentation at the Lake Louise Winter Institute

Concepts for University developments, focusing on campus of Rokus str., Pécs, Hungary

The university faculties are situated in different parts of the city and they are not connected to each other. The faculties are located in minimal areas, they are surrounded by residential and public functions. The communication between the faculties and the transport network are not solved for the students and for the city. Traditional campuses have not been established around the universities and the development goals of the university to create them were ineffective. The University of Pécs – as a campus – can only work optimally if the faculties and their surroundings are interconnected by suitable transport, infrastructure network. Within the framework of ’Modern Cities’ University Development Program, it is possible to reconsider the existing premises and to regroup the faculties – when the disunity of the Faculty of Engineering was solved, the significant property stock of the campus in Rókus street partly lost its function due to reorganization. The maintenance of the cadastre in its current form is expensive due to its under-utilized operation. However, the existing properties should be considered an opportunity rather than a problem. With the planned increase in the educational capacity of the Faculty of Pharmacy, we are able to create spaces for transparent education of international standards with a functional change in new emerging development areas in the existing buildings

Identification of histidine‐Ni (II) metal complex by Raman spectroscopy

Metal ions such as nickel have a strong binding affinity to amino acids and form metal complexes of different geometry. This complex formation is influ- enced by many factors among others the kind of reactants and their relative concentrations, pH, and its effect on the net charge of the amino acid mole- cule. In this work, the formation of the histidine-nickel (II) complex in differ- ent conditions was examined by Raman spectroscopy. In addition to the experiments, density functional theory (DFT) calculations on histidine-nickel complexes were performed in order to elucidate the complex formation mecha- nism and optimal geometry of the structures as well as to investigate their vibrational properties. The Raman measurements showed double peaks at 1272 and 1297 cm�1 , and triple peaks at 1322, 1336, and 1355 cm�1 that belong to the metal complex. The geometry optimizations and total energy cal- culations of His-Ni (II) complex revealed that the octahedral geometry and the triplet spin state of Ni ion is the energetically favorable structure. This metal complex is formed through the nitrogen atom of the imidazole side chain, the nitrogen atom of the terminal amino group, and the oxygen atom of the car- boxyl group. Experiments with pH revealed that the alkaline pH favors while the change of the concentration of the metal ions does not affect the the His-Ni (II) complex formation