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- Boström, Kurt, et al.
(författare)
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Geochemistry, mineralogy and origin of the sediments in the Gulf of Bothnia
- 1978
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Ingår i: Proceedings of the Finnish-Swedish seminar on the Gulf of Bothnia. - : Merentutkimuslaito. - 9514636430 ; , s. 8-35
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Konferensbidrag (refereegranskat)abstract
- and DWD at larger depths, but DWD does also occur in some protected depressions where bottom depths may be 20-30 meters or less. DWD represents Postglacial deposits, whereas SWD represents more or less reworked tills. SWD largely consist of little altered rock detritus and are rich in silty, sandy or coarser fractions. DWD contains much clay sized material, but silts and sand may occur occasionally. In general SWD are rich in quartz and feldspars, whereas the DWD are poor in these minerals, but instead show higher contents of X-ray amorphus (background producing) matter, and clay-minerals. The relation Quartz-Feldspar also varies latitudinally, the feldspar-richest sediments occurring towards the North. DWD are enriched in Ti, Fe, Mn, Ba and probably some trace elements (e.g. Cu, Cr) whereas SWD are relatively rich in Si. Al, Ca, Na, and some traces occur in the same concentrations in both sediment types. DWD are identical to average shale in composition and SWD to average granite. This is probably due to a mechanical action, the panning of sediments by waves, bottom currents etc. preferentially moving clay and mica minerals into the deep basins, whereas coarse weathering residues, rich in quartz and feldspar, remain in shallow waters. Iron-manganese concretions occur extensively on the bottom areas that are protected from excessive abrasion and rapid accumulation. The nodules in the Bothnian Bay, are richer in Mn, Cu, Ni and Co than in other parts of Gulf of Bothnia. It is concluded that, in addition to organic matter, hydroxides and other fines may be important adsorbers of pollutants in sediments
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- Burman, Jan-Ola, et al.
(författare)
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Geochemical analyses by-plasma spectroscopy
- 1977
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Ingår i: GFF. - : Informa UK Limited. - 1103-5897 .- 2000-0863. ; 99:2, s. 102-110
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Tidskriftsartikel (refereegranskat)abstract
- Microwave plasma (MWP) and inductively coupled plasma (ICP) have been used as excitation sources in spectroscopic analyses. The results show that MWP and ICP sources are excellent for spectroscopic determinations of a large number of major, minor and trace constituents in various geological materials. The low detection limits, the restricted matrix effects and the large number of elements that can easily be determined in a single process make MWP and ICP spectroscopy superior to atomic absorption and X-ray spectroscopy in many geochemical studies.
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| 7. |
- Boman, Kurt, et al.
(författare)
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Remote-controlled robotic arm for real-time echocardiography : the diagnostic future for patients in rural areas?
- 2009
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Ingår i: Telemedicine journal and e-health. - : Mary Ann Liebert Inc. - 1530-5627 .- 1556-3669. ; 15:2, s. 142-147
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Tidskriftsartikel (refereegranskat)abstract
- There exists a great clinical need for improving specialist consultation and utilization of echocardiography in areas remote from hospital-based care. This paper presents the development and first technical assessment of a concept of cardiovascular consultation utilizing long distance, real-time echocardiography as a diagnostic tool in rural areas. The development of CARdiological consultation at a DISTance (CARDISTA) was achieved in three stages, comprising tests of different broadband infrastructures, videoconference systems, microphones, cameras, monitors, and loudspeakers. The CARDISTA concept includes a cardiologist and a sonographer, a robotic arm (Medirob), a portable ultrasound machine, and presently available information technology using an advanced broadband backbone. The three stages provided, with some remaining doubts, echocardiographic examination at a distance comparable to hospital-based examinations. A continuous broadband capacity of 20 megabits per second (Mbps) seemed to be a vital component of CARDISTA for achieving the highest-quality imaging. With this broadband capacity, it was possible to achieve a transmission delay below 200 ms. The technical tests of the CARDISTA concept revealed promising results in enabling long distance real-time echocardiography for specialist consultation. CARDISTA is now ready for clinical testing and evaluation in rural areas for patients with heart diseases, especially heart failure.
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- Boström, Kurt, et al.
(författare)
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Biological matter as a source of authigenic matter in pelagic sediments
- 1978
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Ingår i: Chemical Geology. - : Elsevier BV. - 0009-2541 .- 1872-6836. ; 23:1-4, s. 11-20
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Tidskriftsartikel (refereegranskat)abstract
- Pelagic sediments are rich in components that appear to have formed from seawater, so-called authigenic deposits. Such authigenic components are commonly well oxidized and are rich in many metals such as Cu, Co and Ni. On the other hand, most of these metals have restricted solubilities and very short residence times in seawater. True authigenesis can therefore only account for little of the "authigenic"-looking matter in the deep sea.Conservative mixing models, using average terrigenous matter, average marine biological matter, average volcanic matter (East Pacific Rise-emanation) and average basaltic matter, produce model sediments that are strikingly similar to real sediments.In the model sediments several of the trace-element abundances for instance those for Cu, Ni and Ba can only be explained by a large admixture of biological matter. Several of these elements are enriched in the authigenic phases in deep-sea sediments. This implies that most components that generally have been considered as authigenic are rearranged decay products of biological material.
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