Plasma medicine: The great prospects when physics meets medicine

The research has demonstrated the antimicrobial properties of plasma urging the incorporation of cold atmospheric plasma (CAP) decontamination in current clinical therapies with the aim to improve the benefits on the patients and on society.Postprint (published version

Electronic state spectroscopy of 1,4-Pentadiene as studied by VUV photoabsorption spectroscopy and ab initio calculations

We present high resolution VUV photoabsorption spectra of 1,4-pentadiene, C5H8, over the wavelength range 115−247 nm (10.8−5.0 eV). These spectra reveal several new features not previously reported in the literature. These measurements are complemented by the first ab initio calculations for the three most abundant conformational isomers of 1,4-pentadiene, C5H8, which we then use in the assignment of valence and Rydberg transitions. Calculations of the two lowest energy ionic states of 1,4-pentadiene are also presented and compared with the experimental data available in the literature. The measured absolute photoabsorption cross sections have been used to calculate the photolysis lifetime of 1,4-pentadiene in the upper stratosphere (20−50 km)

Structural and magnetic properties of UFe6Ga6

UFe6Ga6 polycrystalline samples were prepared by arc-melting, and single crystals were grown by the Czochralski method. This compound crystallizes in the orthorhombic ScFe6Ga6-type structure (space group Immm, a=5.0560(4), b=8.5484(7) and c=8.6914(7) A), an ordered variant of the ThMn12-type structure. A ferromagnetic-type transition at TC=530(5) K is seen in the magnetization and A.C.-susceptibility measurements, and no other magnetic anomaly is observed down to 5 K. Single crystal magnetization measurements along the three different crystallographic axes indicated a as the easy direction, with a spontaneous magnetization MS=12.3 [mu]B/f.u. at 5 K. The analysis of the 57Fe Mössbauer spectroscopy data indicated magnetic hyperfine fields, Bhf, significantly lower on 4f sites than on 8k sites, in agreement with the trend already observed on UFexAl12-x, where the average Bhf were found to increase with the iron-iron interatomic distances.http://www.sciencedirect.com/science/article/B6TX8-4HHP3CB-1/1/12a2f56816fce995f3512d254f7298e

Effect of the sintering temperature on the properties of nanocrystalline Ca1−xSmxMnO3 (0 ≤ x ≤ 0.4) powders

Nanocrystalline Ca1−xSmxMnO3 (0 ≤ x ≤ 0.4) manganites were prepared by a soft chemical method (Pechini method) followed by auto-combustion and sintering in air at 1073 or 1473 K. Single-phase powders with general composition Ca1−xSmxMnO3 were obtained after 18 h annealing. The particle and grain sizes of the substituted Sm-manganites did not exhibit variation with samarium content, but increase with increasing the sintering temperature. All manganites show two active IR vibrational modes near 400 and 600 cm−1 characteristic of the BO6 octahedron vibrations. For the samples sintered at Ts = 1473 K, the partial substitution of calcium by samarium in the CaMnO3 phase induces a marked decrease in the electrical resistivity, in the temperature range of 300–900 K, and at the same time a metal-to-insulator transition occurs; for Ts = 1073 K all the samples present semiconductor behaviour. With the increase of the annealing temperature the grain size increases and a metal–semiconductor transition appears. The results can be ascribed to the Mn4+/Mn3+ ratio and particle grain size. The effects of particle size on the electrical properties can be attributed to the domain status, changes in the Mn–O–Mn bond angle and Mn–O bond length

Deficientes físicos e visuais: barreiras na utilização das bibliotecas da Universidade Federal de Minas Gerais.

Estudo das barreiras que interferem na utilização das bibliotecas da UFMG pelos deficientes físicos e visuais. Apresentação da metodologia utilizada e de resultados das entrevistas, dos depoimentos e do experimento gravado em vídeo-cassete. Conclusões

Intramolecular addition of acyldiazenecarboxylates onto double bonds in the synthesis of heterocycles

Appropriate aryl-substituted unsymmetrical azodicarbonyl compounds, generated from bishydrazides by oxidation, undergo intramolecular cyclisations to furnish a variety of useful heterocycles such as N-substituted oxindoles, carbostyrils, benzazepinones, benzazocinones, benzimidazolones, benzoxazinones and pyrazolones in varying degrees of efficiency. Methods are described to remove the N-acyl groups from the heteroaromatic compounds. Under mildly acidic conditions where equal opportunities are available for an ipso or a normal cyclisation it is the former process that occurs preferentially. Evidence is presented in favour of a C-to-C migration in the ipso product for the formation of a methoxy-substituted carbostyril derivative. One of the spiro substances is shown to participate in dienone–phenol rearrangement to provide the corresponding quinolone–phenol in high yield.info:eu-repo/semantics/publishedVersio

Sputtering Deposition of TiO2 Thin Film Coatings for Fiber Optic Sensors

Funding Information: Funding: The research leading to these results has received funding from the Portuguese funding agency FCT—Fundação para a Ciência e a Tecnologia—within project UID/FIS/04559/2020 to LIB-Phys-UNL and from the FCT/MCTES/PIDDAC. C.S.M. was financed by the FCT—Portuguese national funding agency for science, research and technology—through grant number SFRH/BD/135820/2018. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.Thin films of titanium dioxide (TiO2) and titanium (Ti) were deposited onto glass and optical fiber supports through DC magnetron sputtering, and their transmission was characterized with regard to their use in optical fiber-based sensors. Deposition parameters such as oxygen partial pressure, working pressure, and sputtering power were optimized to attain films with a high reflectance. The films deposited on glass supports were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Regarding the deposition parameters, all three parameters were tested simultaneously, changing the working pressure, the sputtering power, and the oxygen percentage. It was possible to conclude that a lower working pressure and higher applied power lead to films with a higher reflectance. Through the analysis of the as-sputtered thin films using X-ray diffraction, the deposition of both Ti and TiO2 films was confirmed. To study the applicability of TiO2 and Ti in fiber sensing, several thin films were deposited in single mode fibers (SMFs) using the sputtering conditions that revealed the most promising results in the glass supports. The sputtered TiO2 and Ti thin films were used as mirrors to increase the visibility of a low-finesse Fabry–Perot cavity and the possible sensing applications were studied.publishersversionpublishe