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- Dell'Unto, Nicolo, et al.
(författare)
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Experiencing Ancient Buildings from a 3D GIS Perspective : a Case Drawn from the Swedish Pompeii Project
- 2015
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Ingår i: Journal of Archaeological Method and Theory. - : Springer Science and Business Media LLC. - 1573-7764 .- 1072-5369. ; 23:1, s. 73-94
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Tidskriftsartikel (refereegranskat)abstract
- In recent times, archaeological documentation strategies have been considerably improved by the use of advanced 3D acquisition systems. Laser scanning, photogrammetry and computer vision techniques provide archaeologists with new opportunities to investigate and document the archaeological record. In spite of this, the amount of data collected and the geometrical complexity of the models resulting from such acquisition processes, have always prevented their systematic integration into a GIS environment. Recent technological advances occurred in the visualization of 3D contents, led us to overcome the aforementioned limitations and set up a work pipeline in which was possible to put the 3D models not only in the context of data visualization but also in the frame of spatial analysis. The case study described is a part of the Swedish Pompeii Project, a research and fieldwork activity started in 2000 with the purpose of recording and investigating an entire Pompeian city block, Insula V 1. As an additional part of the research, a laser scanning acquisition campaign was conducted in the last few years. The resulting models were thus meant to be used to develop further research lines: among these, a 3D-GIS system was expected to be set up with the purpose to i) collect in the same geo-referenced environment, different typologies of documentation gathered in the context of the Swedish Pompeii Project; ii) inter-connect 3D-models with the project website; iii) use the third-dimension as a further analytical field of investigation, in the form of spatial analysis and cognitive simulation.
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| 2. |
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| 3. |
- Östborn, Per, et al.
(författare)
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The diffusion of fired bricks in Hellenistic Europe : a similarity network analysis
- 2015
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Ingår i: Journal of Archaeological Method and Theory. - : Springer Science and Business Media LLC. - 1573-7764 .- 1072-5369. ; 22:1, s. 306-344
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Tidskriftsartikel (refereegranskat)abstract
- In this study, similarity networks are used to analyse the diffusion of fired bricks across Hellenistic Europe, initiated in the north Aegean in the fourth century BCE. In a similarity network, archaeological contexts with similar attributes are connected according to a predefined criterion, and the edges are interpreted as potential social or causal links. Here we allow any kind of similarity relation between brick contexts as a criterion for connection, where different kinds of attributes can be mixed. The analysis suggests that there was indeed a diffusion process, as opposed to random, independent appearances of fired bricks. This diffusion seems to have taken place in a small-world social network of builders and decision-makers, where the range of most connections was shorter than 250 km but where long-range connections were also present. The data seemingly exclude a scale-free network, in which the diffusion is governed by a few dominant hubs. An early cluster of homogeneous brick usage appears in the south-eastern part of Hellenistic Europe, as well as a late cluster in the north-west. In the late cluster, the homogenisation applies to larger constructions (public or military) than in the early cluster (mainly sepulchral), suggesting that the use of fired bricks became established at higher societal levels in the last century BCE.
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| 4. |
- Wittbom, C., et al.
(författare)
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Effect of solubility limitation on hygroscopic growth and cloud drop activation of SOA particles produced from traffic exhausts
- 2018
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Ingår i: Journal of Atmospheric Chemistry. - : Springer Science and Business Media LLC. - 0167-7764 .- 1573-0662. ; 75:4, s. 359-383
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Tidskriftsartikel (refereegranskat)abstract
- Hygroscopicity measurements of secondary organic aerosol (SOA) particles often show inconsistent results between the supersaturated and subsaturated regimes, with higher activity as cloud condensation nucleus (CCN) than indicated by hygroscopic growth. In this study, we have investigated the discrepancy between the two regimes in the Lund University (LU) smog chamber. Various anthropogenic SOA were produced from mixtures of different precursors: anthropogenic light aromatic precursors (toluene and m-xylene), exhaust from a diesel passenger vehicle spiked with the light aromatic precursors, and exhaust from two different gasoline-powered passenger vehicles. Three types of seed particles were used: soot aggregates from a diesel vehicle, soot aggregates from a flame soot generator and ammonium sulphate (AS) particles. The hygroscopicity of seed particles with condensed, photochemically produced, anthropogenic SOA was investigated with respect to critical supersaturation (sc) and hygroscopic growth factor (gf) at 90% relative humidity. The hygroscopicity parameter κ was calculated for the two regimes: κsc and κgf, from measurements of sc and gf, respectively. The two κ showed significant discrepancies, with a κgf /κsc ratio closest to one for the gasoline experiments with ammonium sulphate seed and lower for the soot seed experiments. Empirical observations of sc and gf were compared to theoretical predictions, using modified Köhler theory where water solubility limitations were taken into account. The results indicate that the inconsistency between measurements in the subsaturated and supersaturated regimes may be explained by part of the organic material in the particles produced from anthropogenic precursors having a limited solubility in water.
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