Browsing by Author "Gomes, A."
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- Cyber pornography use inventory-9: factor structure and psychometric properties in the Portuguese populationPublication . Cardoso, J.; Ramos, C.; Almeida, T.; Gomes, A.; Fernandes, A.; Ribeiro, R.Online pornography is characterized by easy and anonymous accessibility, as well as free or low cost. The impact of pornography depends on the type of content consumed, the frequency of exposure, and the personal and contextual characteristics of users. Several, mainly negative, effects have been reported, related to exposure to pornography, including more permissive sexual norms, inappropriate attitudes towards gender roles, unrealistic expectations, decreased sexual interest in the partner, lower relational and sexual satisfaction, sexual addiction, and devaluation or legitimation of sexual violence.
- Intercalation of a molybdenum eta3-allyl dicarbonyl complex in a layered double hydroxide and catalytic performance in olefin epoxidation.Publication . Gomes, A.; Bruno, S.; Gamelas ou Carla A. Gamelas, Carla; Valente, A.; Abrantes, M.; Gonçalves, I.; Romão, C.; Pillinger, M.A Zn–Al layered double hydroxide (LDH) intercalated by [Mo(η3-C3H5)Cl(CO)2(bpdc)]2− anions (bpdc = 2,2′-bipyridine-5,5′-dicarboxylate) has been prepared by coprecipitation from aqueous solution and characterised by various techniques. The one-pot method gives rise to a highly organised intercalate with an interlayer spacing of 18.3 Å and up to six (00l) basal reflections in the powder X-ray diffraction pattern. Spectroscopic studies (FT-IR, FT-Raman, 13C CP MAS NMR and UV-Vis) confirm the presence of structurally intact [Mo(η3-C3H5)Cl(CO)2(bpdc)]2− anions. The interlayer spacing of 18.3 Å indicates that the material contains a monolayer of guest anions positioned in such a way that the bpdc ligands are arranged with their longest dimension roughly perpendicular to the hydroxide layers of the host. Thermal properties were studied by thermogravimetric analysis and differential scanning calorimetry. The intracrystalline reactivity of intercalated dicarbonyl complexes was probed by using the hybrid nanocomposite as a precatalyst in the liquid phase epoxidation of cis-cyclooctene with tert-butylhydroperoxide as oxidant. Under the reaction conditions used, oxidative decarbonylation of the guest molecules takes place (with release of CO and CO2 as confirmed by on-line gas chromatography experiments) to give intercalated molybdenum oxide/bipyridine species that selectively catalyse the epoxidation reaction. The intracrystalline oxidative decarbonylation reaction is topotactic in nature.
- Mechanical construction and installation of the ATLAS tile calorimeterPublication . ATLAS Tile Calorimeter collaboration (234 authors); Alves, R.; Amaral, P.; Carvalho, J.; David, M.; Gomes, A.; Maio, A.; Marques, C.; Onofre, A.; Pereira, A.; Pina, J.; Pinhão, J.; Santos, J.; Saraiva, J.G.; Silva, J.This paper summarises the mechanical construction andinstallation of the Tile Calorimeter for the ATLASexperiment at the Large Hadron Collider in CERN, Switzerland. The TileCalorimeter is a sampling calorimeter using scintillator as the sensitivedetector and steel as the absorber and covers the central region of the ATLASexperiment up to pseudorapidities ±1.7. The mechanical construction ofthe Tile Calorimeter occurred over a periodof about 10 years beginning in 1995 with the completionof the Technical Design Report and ending in 2006 with the installationof the final module in the ATLAS cavern. Duringthis period approximately 2600 metric tons of steel were transformedinto a laminated structure to form the absorber of the sampling calorimeter.Following instrumentation and testing, which is described elsewhere, themodules were installed in the ATLAS cavern with a remarkable accuracy fora structure of this size and weight.
- Perceived addiction to online pornography and sexual attitudes in Portuguese college studentsPublication . Gomes, A.; Fernandes, A.; Ribeiro, R.; Cardoso, J.; Ramos, C.There is evidence that sexual attitudes are linked to viewing online pornography, but an operational definition of online pornography problematic use doesn’t exist. College students are usually associated with more permissive sexual attitudes that elicit a greater acceptance of internet pornography, which can be addictive. The main objective of this study was to characterize the use of online pornography and sexual attitudes in Portuguese college students, confirming if they are related and analyzing if these variables differ according to sociodemographic aspects: gender, sexual orientation, marital status, romantic relationship and educational level.
- Pseudomixoma peritoneal – uma entidade heterogéneaPublication . Redondo, L.; Gomes, A.; Cunha, Teresa Margarida; Cabral, I.
- The benefit of macrolide therapy in patients with pneumococcal pneumonia is only present in patients with bacteremiaPublication . Gonçalves-Pereira, J.; Costa, L.; Silva, I.; Simões, A.; Froes, F.; Mergulhão, P.; Varela Ramos, P.; Leal, D.; Alves, R.; Custódio, M.; Gomes, A.
- The benefit of macrolide therapy in patients with pneumococcal pneumonia is only present in patients with bacteremiaPublication . Gonçalves-Pereira, J.; Costa, L.; Silva, I.; Simões, A.; Froes, F.; Mergulhão, P.; Varela Ramos, P.; Leal, D.; Alves, R.; Custódio, M.; Gomes, A.
- The Laser calibration of the Atlas Tile Calorimeter during the LHC run 1Publication . ATLAS Tile Calorimeter system collaboration (238 authors); Santos, S.P.Amor Dos; Araque, J.P.; Castro, A.Blanco; Carvalho, J.; Castro, N.F.; De Sousa, M.J.Da Cunha Sargedas; Fiolhais, M.C.N.; Galhardo, B.; Gomes, A.; Jorge, P.M.; Martins, P.J.Magalhaes; Maio, A.; Maneira, J.; Seabra, L.F.Oleiro; Onofre, A.; Pedro, R.; Pina, J.; Santos, H.; Saraiva, J.G.; Silva, J.; Delgado, A.Tavares; Veloso, F.This article describes the Laser calibration system of the Atlas hadronic Tile Calorimeter that has been used during the run 1 of the LHC. First, the stability of the system associated readout electronics is studied. It is found to be stable with variations smaller than 0.6 %. Then, the method developed to compute the calibration constants, to correct for the variations of the gain of the calorimeter photomultipliers, is described. These constants were determined with a statistical uncertainty of 0.3 % and a systematic uncertainty of 0.2 % for the central part of the calorimeter and 0.5 % for the end-caps. Finally, the detection and correction of timing mis-configuration of the Tile Calorimeter using the Laser system are also presented.
- Use of organomolybdenum compounds for promoted hydrolysis of phosphoester bonds in aqueous mediaPublication . Gomes, A.; Gamelas ou Carla A. Gamelas, Carla; Fernandes, J.; Almeida-Paz, F.; Nunes, P.; Pillinger, M.; Gonçalves, I.; Romão, C.; Abrantes, M.The dissolution of the indenyl (Ind) complex [{(η5‐Ind)Mo(CO)2(μ‐Cl)}2] (1) in N,N′‐dimethylformamide (DMF) gives the ring‐slipped complex [(η3‐Ind)Mo(CO)2Cl(DMF)2] (2). The aerial oxidation of 2 leads to the formation of the dinuclear oxomolybdenum(V) chloride [Mo2O2(DMF)4(μ‐O)2Cl2] (3). The structures of 2 and 3·DMF have been determined by single‐crystal X‐ray diffraction. Compounds 1 and 3 were examined as promoters of phosphoester bond hydrolysis in para‐nitrophenylphosphate (pNPP), which was used as a model substrate. The reactions were performed in aqueous solution at 55 °C and followed by 1H NMR spectroscopy. For assays performed with 30–100 mol‐% of 1 or 3 relative to pNPP, both compounds promote the production of para‐nitrophenol (pNPh) from pNPP. Compound 3 is especially active in promoting the hydrolytic cleavage of the phosphoester bond (t1/2 < 80 min).