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2007
Mayo, R., M. Ortiz, F. Parente, and J. P. Santos. "Experimental and theoretical transition probabilities for lines arising from the 6p configurations of Au II." Journal of Physics B: Atomic, Molecular and Optical Physics. 40 (2007): 4651. AbstractWebsite
Experimental relative transition probabilities for the 16 more pro-eminent lines arising from the 6p configurations of Au II were determined from the emission-line intensities in a laser-produced plasma. The experiment was carried out using a Cu-Au alloy with 10% Au content in order to obtain an optically thin plasma. Transition probabilities were placed on an absolute scale by using theoretical lifetimes calculated in this work, line-strength sum rules and Boltzmann plot. A comparison has been conducted between present experimental results, the theoretical data available and new calculations with the multi-configuration Dirac-Fock method reported in this work, as well as a study of the plasma conditions.
Mayo, R., M. Ortiz, F. Parente, and J. P. Santos. "Experimental and theoretical transition probabilities for lines arising from the 6p configurations of Au II." Journal of Physics B: Atomic, Molecular and Optical Physics. 40 (2007): 4651. AbstractWebsite

Experimental relative transition probabilities for the 16 more pro-eminent lines arising from the 6p configurations of Au II were determined from the emission-line intensities in a laser-produced plasma. The experiment was carried out using a Cu-Au alloy with 10% Au content in order to obtain an optically thin plasma. Transition probabilities were placed on an absolute scale by using theoretical lifetimes calculated in this work, line-strength sum rules and Boltzmann plot. A comparison has been conducted between present experimental results, the theoretical data available and new calculations with the multi-configuration Dirac-Fock method reported in this work, as well as a study of the plasma conditions.

Allam, A., I. M. Filanovsky, L. B. Oliveira, and J. R. Fernandes. "Experimental comparison of coupling effects on the performance of quadrature CMOS LC and RC oscillators." Circuits and Systems, 2007. MWSCAS 2007. 50th Midwest Symposium on. IEEE, 2007. 606-609. Abstract
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Oliveira, L. B., J. R. Fernandes, MM Silver, I. M. Filanovsky, and C. J. M. Verhoeven. "Experimental evaluation of phase-noise and quadrature error in a CMOS 2.4 GHz relaxation oscillator." Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on. IEEE, 2007. 1461-1464. Abstract
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Linaldeddu, BT, A. Franceschini, J. Luque, and AJL Phillips. "First report of canker disease caused by Botryosphaeria parva on cork oak trees in Italy." Plant Disease. 91 (2007): 324. Abstract
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Rodrigues, A., Mário Neves, and João Pina. "Fuel Cells as Clean Electrical Energy Sources." XCLEEE - X Portuguese-Spanish Conference in Electrical Engineering. 2007. Abstract
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Guilherme, M., C. G. Timoteo, P. Tavares, and AS Pereira. "Functional studies on a bacterioferritin from the anaerobe Desulfovibrio vulgaris." J Biol Inorg Chem. 12 (2007): S77. Abstract
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Davim, E. a, M. H. V. a Fernandes, and R. C. C. b Monteiro. "Glass-ceramics produced from incinerated municipal solid waste." Glass Technology: European Journal of Glass Science and Technology Part A. 48 (2007): 164-167. AbstractWebsite

A homogeneous black coloured glass was obtained by melting the bottom ashes produced by a municipal solid waste incinerator at 1300°C for 2 h without any chemical additives. Based on thermal analysis data glass-ceramics were produced by heat treating the glass, doped with additional TiO2 as a nucleating agent, at temperatures between 870 and 1000°C. The crystalline phases precipitated during the heat treatments were identified by powder XRD and the microstructures were examined using SEM. After a heat treatment at 900°C for 2 h, the glass was converted into a fine grained glass-ceramic with uniform microstructure. The major crystalline phases precipitated in the glass-ceramics were augite (Ca(Mg,Fe)Si2O6), gehlenite (Ca2Al2SiO7) and clinopyroxene (Ca(Ti,Mg,Al)(Si,Al)2O6). Preliminary evaluation of the mechanical and chemical properties of the bottom ash glasses and glass-ceramics suggest that they have potential to compete with existing natural and commercial outdoor cladding materials.

Polcyn, M., LL Jacobs, A. Schulp, and O. Mateus. "Halisaurus (Squamata: Mosasauridae) from the Maastrichtian of Angola." Journal of Vertebrate Paleontology. 27(suppl. to 3) (2007): 130. Abstract
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Coelho, Catarina, Pablo J. Gonzalez, Jose Trincao, Ana L. Carvalho, Shabir Najmudin, Thomas Hettman, Stephan Dieckman, Jose J. G. Moura, Isabel Moura, and Maria J. Romao. "Heterodimeric nitrate reductase (NapAB) from Cupriavidus necator H16: purification, crystallization and preliminary X-ray analysis." Acta Crystallographica Section F-Structural Biology and Crystallization Communications. 63 (2007): 516-519. Abstract
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Pina, João, C. Caracaleanu, A. Gonçalves, Pedro Pereira, S. Valtchev, Mário Neves, and A. Rodrigues. "High Performance, Environment Friendly, Modular and Fault Tolerant Renewable Energy Microgrid." 12th International Energy Conference & Exhibition (ENERGEX2007). 2007.
Pina, João, C. Caracaleanu, A. Gonçalves, Pedro Pereira, S. Valtchev, Mário Neves, and A. Rodrigues. "High Performance, Environment Friendly, Modular and Fault Tolerant Renewable Energy Microgrid." 12th International Energy Conference & Exhibition (ENERGEX2007). 2007. Abstract
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MC, Lanca, Wirges W, Neagu ER, Gerhard R, and Marat-MendeS J. "Influence of humidity on the electrical charging properties of cork agglomerates." Journal of Non-Crystalline Solids. 353.47-51 (2007). AbstractWebsite

Cork is a natural cellular and electrically insulating material which may have the capacity to store electric charges on or in its cell walls. Since natural cork has many voids, it is difficult to obtain uniform samples with the required dimensions. Therefore, a more uniform material, namely commercial cork agglomerate, usually used for floor and wall coverings, is employed in the present study. Since we know from our previous work that the electrical properties of cork are drastically affected by absorbed and adsorbed water, samples were protected by means of different polymer coatings (applied by spin-coating or soaking). Corona charging and isothermal charging and discharging currents were used to study the electrical trapping and detrapping capabilities of the samples. A comparison of the results leads to the conclusion that the most promising method for storing electric charges in this cellular material consists of drying and coating or soaking with a hydrophobic, electrically insulating polymer such as polytetraflouroethylene (Teflon (R)).

Lanca, M. C., W. Wirges, E. R. Neagu, R. Gerhard, and J. Marat-Mendes. "Influence of humidity on the electrical charging properties of cork agglomerates." Journal of Non-Crystalline Solids. 353 (2007): 4501-4505. AbstractWebsite

Cork is a natural cellular and electrically insulating material which may have the capacity to store electric charges on or in its cell walls. Since natural cork has many voids, it is difficult to obtain uniform samples with the required dimensions. Therefore, a more uniform material, namely commercial cork agglomerate, usually used for floor and wall coverings, is employed in the present study. Since we know from our previous work that the electrical properties of cork are drastically affected by absorbed and adsorbed water, samples were protected by means of different polymer coatings (applied by spin-coating or soaking). Corona charging and isothermal charging and discharging currents were used to study the electrical trapping and detrapping capabilities of the samples. A comparison of the results leads to the conclusion that the most promising method for storing electric charges in this cellular material consists of drying and coating or soaking with a hydrophobic, electrically insulating polymer such as polytetraflouroethylene (Teflon (R)). (c) 2007 Elsevier B.V. All rights reserved.

Gonçalves, G., Elangovan Barquinha Pereira Martins Fortunato E. P. L. "Influence of post-annealing temperature on the properties exhibited by ITO, IZO and GZO thin films." Thin Solid Films. 515 (2007): 8562-8566. AbstractWebsite

In this work we present a study on the effect of annealing temperatures on the structural, morphological, electrical and optical characteristics of gallium doped zinc oxide (GZO), indium zinc oxide (IZO) and indium-tin-oxide (ITO) films. GZO and IZO films were deposited at room temperature by r.f. magnetron sputtering, whereas the ITO films were commercial ones purchased from Balzers. All films were annealed at temperatures of 250 and 500 °C in open air for 1 h. The GZO and ITO films were polycrystalline. The amorphous structure of as-deposited IZO films becomes crystalline on high temperature annealing (500 °C). The sheet resistivity increased with increase in annealing temperature. GZO films showed an increase of 6 orders of magnitude. The optical transmittance and band gap of as-deposited films varied with annealing. The highest transmittance (over 95 %) and maximum band gap (3.93 eV) have been obtained for ITO films. © 2007 Elsevier B.V. All rights reserved.

do Wang, J.a, Sallet Jomard Botelho Rego Elamurugu Martins Fortunato V. b F. b. "Influence of substrate temperature on N-doped ZnO films deposited by RF magnetron sputtering." Thin Solid Films. 515 (2007): 8785-8788. AbstractWebsite

Nitrogen-doped ZnO films were deposited by RF magnetron sputtering in 75% of N2 / (Ar + N2) gas atmosphere. The influence of substrate temperature ranging from room temperature (RT) to 300 °C was analyzed by X-ray diffractometry (XRD), spectrophotometry, X-ray photoelectron spectroscopy (XPS), secondary-ion mass spectrometry (SIMS) and Hall measurements setup. The XRD studies confirmed the hexagonal ZnO structure and showed that the crystallinity of these films increased with increasing substrate temperature (Ts). The optical studies indicate the average visible transmittance in the wavelength ranging 500-800 nm increases with increasing Ts. A minimum transmittance (9.84%) obtained for the films deposited at RT increased with increasing Ts to a maximum of 88.59% at 300 °C (500-800 nm). Furthermore, it was understood that the band gap widens with increasing Ts from 1.99 eV (RT) to 3.30 eV (250 °C). Compositional analyses (XPS and SIMS) confirmed the nitrogen (N) incorporation into the ZnO films and its decreasing concentration with increasing Ts. The negative sign of Hall coefficients confirmed the n-type conducting. © 2007 Elsevier B.V. All rights reserved.

do Wang, J.a, Sallet Jomard Botelho Rego Elamurugu Martins Fortunato V. b F. b. "Influence of the reactive N2 gas flow on the properties of rf-sputtered ZnO thin films." Thin Solid Films. 515 (2007): 8780-8784. AbstractWebsite

Nitrogen (N)-doped ZnO thin films were RF sputtered with different N2 volume (ranging from 10% to 100%) on sapphire (001) substrates. The influence of N2 vol.% on the properties of ZnO films was analyzed by various characterization techniques. The X-ray diffraction studies showed that the films grow along the preferential (002) crystallographic plane and the crystallinity varied with varying N2 vol.%. The films sputtered with 25 vol.% N2 showed better crystallinity. The transmittance was decreased with increasing N2 volume until 25% and was almost constant above 25%. A maximum optical band gap (2.08 eV) obtained for 10 vol.% N2 decreased with increasing N2 volume to reach a minimum of 1.53 eV at 100%. The compositional analysis confirmed the incorporation of N into ZnO films, and its concentration increased with increasing N2 volume to reach a maximum of ∼ 3.7 × 1021 atom/cm3 at 75% but then decreased slightly to 3.42 × 1021 atoms/cm3. The sign of Hall coefficient confirmed that the films sputtered with ≤ 25 vol.% N2 possess p-type conductivity which changes to n-type for > 25 vol.% N2. © 2007 Elsevier B.V. All rights reserved.

Nunes, Isabel L. "Knowledge Acquisition for the Development of an Upper- Body Work-Related Musculoskeletal Disorders Analysis Tool." Human Factors and Ergonomics in Manufacturing. 17 (2007): 149-162. Abstract
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André, J. M., V. H. Fernandes, and J. D. Mitchell. "Largest 2-generated subsemigroups of the symmetric inverse semigroup." Proc. Edinb. Math. Soc. (2). 50 (2007): 551-561.Website
Pina, João, Mário Neves, Alfredo Álvarez, and Amadeu Rodrigues. "Magnetisation System and Thrust Force Measurement of an All Superconducting Linear Synchronous Motor." X Portuguese-Spanish Congress in Electrical Engineering. 2007. Abstract
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Ferreira, AJ, PL Almeida, I. Costa, P. Brogueira, and M. H. Godinho. "Mechanically activated cholesteric polymer dispersed liquid crystals." Liquid Crystals. 34.11 (2007): 1269-1273. Abstract
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Diniz, M. S., H. M. Santos, P. M. Costa, I. Peres, M. H. Costa, and J. L. Capelo. "Metallothionein responses in the Asiatic clam (Corbicula fluminea) after exposure to trivalent arsenic." Biomarkers. 12 (2007): 589-598. AbstractWebsite
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Araújo, João, and Janusz Konieczny. "A method of finding automorphism groups of endomorphism monoids of relational systems." Discrete Math.. 307 (2007): 1609-1620. AbstractWebsite
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