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- Alakangas, Lena, et al.
(författare)
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Project: Development, Evaluation and Optimization of Measures to Reduce the Impact on the Environment from Mining Activities in Northern Regions
- 2016
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Annan publikation (populärvet., debatt m.m.)abstract
- Min-North is a transnational project financed by the Interreg Nord program and coordinated by LTU. The project is a cooperation between Geological survey of Finland, GTK, Oulo University (Finland), The Arctic University of Norway, UiT and several (>17) small and large enterprises and mining companies in the northern region with expertise within geology, waste management, geophysics and geochemistry. The overall goal is to reduce the environmental impacts of mining in the northern regions by developing, evaluating, optimizing environmental techniques. In Sweden, geophysical and geochemical techniques will be integrated to develop a 4D model for tracing pollution transport in the mine waste, mine areas and in(to) the surroundings.
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| 2. |
- Hallengren, Anders, 1950-
(författare)
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Jordbävningen i Tangshan
- 1976
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Ingår i: Värld och vetande. - 0346-4873. ; 25:11, s. 321-329
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Bildreportage om naturkatastrofen, räddningsarbetet – dess politiska betydelse och efterspel – med idel kinesisk massmedial betoning på djärvheten och hjältemodet hos folket, underdrift om ödeläggelsen, och i övermått om det snabba återuppbyggnadsarbetet och framtidsoptimism. — I denna artikel förutskickas även den nyligen bortgångne Mao Zedongs definitiva fall som ledstjärna i kinesisk politik, vilket explicit inträffade året efter att Maos mausoleum öppnats för allmänheten på Torget vid Himmelska fridens port (november 1977) – då Deng Xiaoping under sitt första år som kommunistpartiets högste ledare 1978 initierade socialistiska marknadsreformer, och därmed påbörjade den radikala förändringen av Maos ideologi i Folkrepubliken Kina (PRC).
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| 7. |
- Bylund, G., et al.
(författare)
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Från Söderhavet till Arktis
- 2000
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Ingår i: Har du tid?. - Stockholm : Naturvetenskapliga forskningsrådet (NFR). - 9154603579 ; , s. 61-74
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Bokkapitel (populärvet., debatt m.m.)
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| 8. |
- Dyrelius, D., et al.
(författare)
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Bergarters fysik
- 1985
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Ingår i: Geofysik. - Uppsala : Svenska fysikersamfundet. - 9186344285
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Bokkapitel (populärvet., debatt m.m.)
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| 9. |
- Eshagh, Mehdi, 1977-
(författare)
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Complementary studies in Satellite Gravity Gradiometry
- 2009
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Rapport (populärvet., debatt m.m.)abstract
- The gravity field and steady-state ocean circulation explorer (GOCE) (ESA 1999,Albertella et al. 2002, Balmino et al. 1998 and 2001) was finally launched on 17thMarch in 2009. In this satellite mission the second-order derivatives of the Earth’sgravitational potential are measured based on differential accelerometer at a satellitebornegradiometer. It is expected to recover the geopotential coefficients to higherdegrees and orders than those were obtained from the former satellite missions; sayup to degree and order 300. Such an Earth’s gravity model will have an accuracy of 1cm in global geoid height and of 1 mGal for the gravity anomalies, which areextremely good accuracies of the long-wavelength structure of the gravity field. The present report is a summary of the studies of Mehdi Eshagh when a postdoct/research associate position in division of Geodesy was available for him. Theresearch work consists of the studies continuing his thesis work and completingproject no. 63/07:1, funded by the Swedish National Space Board (SNSB). Thereport is of collective papers type with a series of Papers A-Q. In the following wepresent summaries of his complementary studies. We just present the background ofeach study and the author’s contributions in comparing his research to others’ works.The details about the methodology, theory, numerical investigations and conclusionsare given in the corresponding papers of each subject
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| 10. |
- Ismail, Nazli, 1971-, et al.
(författare)
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The electrical conductivity of the Hallandsås Horst, Sweden; : A controlled source radiomagnetotelluric study
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Annan publikation (populärvet., debatt m.m.)abstract
- We studied the behaviour of controlled source responses of 2½-D synthetic models based on controlled source tensor magnetotelluric (CSTMT, 1 – 12 kHz) and radio magnetotelluric (RMT, 14 – 250 kHz) data sets collected along profiles on the Hallandsås Horst, Southern Sweden with a view to study the depth extent of possible near surface fractures zones that might intersect a tunnel under construction. Based upon 2½-D forward modelling of the TE- and TM-mode RMT data, a simplified 2D model was constructed such that a dipping conductor was continued down to a depth of 140 m, which is the depth of the tunnel. Based on this extended model, we calculated both plane wave and controlled source responses for the frequency range 1-250 kHz corresponding to the source location in the study. Finally, we inverted both data sets under plane wave assumptions. When comparing synthetic controlled source and plane wave data in the frequency range 1 – 12 kHz, we find that the CSTMT transfer functions generally deviate from the plane wave condition for frequencies less than 6 kHz. The phases are much more distorted than apparent resistivities. The TM mode phases, in particular, are generally distorted for frequencies less than 6 kHz. Regarding the vertical magnetic fields, we find that at all frequencies the real part of tippers are distorted by source effects, but the tipper component along the profile direction is much less affected by the off-profile lying source than the tipper component orthogonal to the profile direction. Based upon synthetic model studies of combined CSTMT and RMT (in short; CSRMT) responses, we find that determinant data are less distorted than individual TE- and TM-mode data. On the other hand, TE- and TM-response have greater resolving power and used with care (selecting data that are weakly distorted by source effects), the corresponding models can resolve the conductor down to tunnel depths.
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