Browsing by Issue Date, starting with "2006-11"
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- Determinants of length of stay : a parametric survival analysisPublication . Menezes, António Gomes de; Moniz, Ana Isabel ArrudaLength of stay is one of the most important decisions made by tourists as it conditions their overall expenditure and stress caused on local resources. This paper estimates survival analysis models to learn the determinants of length of stay as survival analysis naturally lends itself to study the time elapsed between arrival and departure at a destination. It is found that individual sociodemographic profiles, such as nationality and gender, and attributes of actual trip experiences, such as repeat visitor behavior and overall satisfaction, are important determinants of length of stay. Thus, this paper’s regression results can be used to estimate the probability that a given group of individuals experiences a stay longer than a given threshold. This is important to the design of marketing strategies that effectively influence length of stays.
- The Aethalometer calibration and determination of iron concentration in dust aerosolsPublication . Fialho, Paulo; Freitas, Maria do Carmo; Barata, Filipe; Vieira, Bruno; Hansen, Anthony; Honrath, RichardThis paper shows the use of the instrumental neutron activation analysis (INAA) technique to calibrate Aethalometer instruments’ response to iron oxides present in Saharan dust aerosol. The five samples selected for this calibration were collected with a seven-wavelength Aethalometer (model AE31) at the summit of Pico mountain (2225 m ASL) in the Azores Islands. These samples correspond to measurements taken between the 31 October and 5 November, 2001. Analysis of these samples by the INAA technique gave a total mass of 14.84 ± 0.70 μg (Fe). Correlation of the analytical results with the optical measurements allowed the determination of the elemental iron calibration constant, KFe (0.234 ±0.022 μm4 m² gˉ¹), which can be used in the determination of iron concentrations from multi-wavelength Aethalometer measurements. As an example of this, we used Aethalometer measurements during the 2001 event to calculate hourly average dust iron, 〈CFe〉, concentrations, which range from 0.00 and 1.77 μg (Fe) mˉ³.
- Intertidal Biotopes of Santa Maria (Azores): mapping and predicting geographical distribution.Publication . Wallenstein, Francisco; Silva, Tito; Álvaro, Nuno V.; Neto, Ana I.