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- Hobiger, Thomas, 1978, et al.
(författare)
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Hard- and software tools for the education of Geodetic VLBI
- 2016
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Ingår i: 9th IVS General Meeting, March 2016, Johannesburg, South Africa.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Onsala Space Observatory hosts two 2.3 m radio telescopes called SALSA ("Such a lovely small antenna") which are utilised to bring front-line interactive astronomy to the classroom. Until now SALSA has been used for astronomical educational purposes solely, in particular demonstrating the concept of single dish measurements. However, it is possible to combine both SALSAs to an interferometer by making use of hardware which has been developed for software-defined radio. In doing so, one can utilise the SALSA antenna pair as a student demonstrator for geodetic Very Long Baseline Interferometry. We will discuss the COTS hardware components that are necessary to turn the SALSA installation into an interferometer. Moreover, we will show how a simple correlator has been used to detect fringes and provide single-band delays. Such delays were then processed with our analysis software c5++. We are going to discuss how it is possible to mimic the complete processing chain of geodetic VLBI and how this can be used for training of students and other interested parties.
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- Antonelli, Alexandre, 1978, et al.
(författare)
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Conceptual and empirical advances in Neotropical biodiversity research
- 2018
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Ingår i: PeerJ. - : PeerJ. - 2167-8359. ; 2018:10
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Tidskriftsartikel (refereegranskat)abstract
- The unparalleled biodiversity found in the American tropics (the Neotropics) has attracted the attention of naturalists for centuries. Despite major advances in recent years in our understanding of the origin and diversification of many Neotropical taxa and biotic regions, many questions remain to be answered. Additional biological and geological data are still needed, as well as methodological advances that are capable of bridging these research fields. In this review, aimed primarily at advanced students and early-career scientists, we introduce the concept of "trans-disciplinary biogeography," which refers to the integration of data from multiple areas of research in biology (e.g., community ecology, phylogeography, systematics, historical biogeography) and Earth and the physical sciences (e.g., geology, climatology, palaeontology), as a means to reconstruct the giant puzzle of Neotropical biodiversity and evolution in space and time. We caution against extrapolating results derived from the study of one or a few taxa to convey general scenarios of Neotropical evolution and landscape formation. We urge more coordination and integration of data and ideas among disciplines, transcending their traditional boundaries, as a basis for advancing tomorrow's ground-breaking research. Our review highlights the great opportunities for studying the Neotropical biota to understand the evolution of life.
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- Friberg, Jöran, 1934, et al.
(författare)
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Fragments of Three Tablets from Ur III Nippur with Drawings of Labyrinths
- 2016
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Ingår i: Sources and Studies in the History of Mathematics and Physical Sciences. - Cham : Springer International Publishing. ; , s. 519-536
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The two almost perfectly preserved clay tablets MS 3194 and MS 4515, with drawings of a rectangular labyrinth in the former case and of a square labyrinth in the latter, were published and thoroughly analyzed in Friberg, MSCT 1 (2007), Sec. 8.3. Since then, the two clay tablets have been baked and cleaned, and new, much improved photos of them have been published in George, CUSAS 18 (2013), nos. 39-40, and online at cdli.ucla.edu, nos. P253616 and P274587.
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- Lundbäck, Mikael
(författare)
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Roadmap for teleoperation and automation of forwarding
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Annually, about two billion m3 of industrial roundwood is harvested worldwide. For a mature forest industry like the Swedish, the next technological development leaps regarding harvest operations are likely to involve increased level of tele-operation and automation. The overall aim of this thesis was to simulate and evaluate combinations of teleoperation and automation of forwarding within the cut-to-length (CTL) harvesting method, and to discuss their potential application internationally. The economic potential of different configurations of a novel concept called semiautomated tele-extraction or just tele-extraction was investigated. To evaluate the potential application of such a concept in other countries, a worldwide mapping of harvesting methods and reasons behind differences, as well as a global analysis of the slope of forest land was done. The overall result showed that there is potential for between 6% and 19% cost reduction in Swedish CTL forwarding if teleextraction is applied. Automation of more time consuming work elements, such as loading, gave larger potential than automation of driving since more operator time was deliberated. The worldwide share of fully mechanized CTL harvesting was estimated to 37% and some of its drivers include high diesel price, gross domestic product and low share of steep terrain. About 80% of global forest land had slope less than 15°, with Africa, Russia, and the Amazon rainforest especially flat. Furthermore, there is potential for implementation of tele-extraction in at least ten countries with a high share of mechanized CTL harvesting, the potential annual volume is roughly between 100 and 150 million m3.
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