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- Andersson, Bert, 1952, et al.
(författare)
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När hjärtat sviker
- 2004
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Bok (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Löthgren, Carl-Johan, 1968-
(författare)
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Mercury and dioxins in a MercOx-scrubber
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The removal of mercury and the absorption of dioxins in an acid wet scrubber have been studied in industrial scale. Hydrogen peroxide is added as an oxidizing agent to the scrubber liquid with the purpose to remove SO2 and enhance the removal of mercury. The scrubber is operating as the final flue gas cleaning stage at the SAKAB plant, a hazardous waste incinerator in Sweden. Mercury speciation was measured in flue gases upstream and downstream of the scrubber with three different techniques: Impingers, solid phase absorbents and a continuous emission monitor. During the flue gas sampling periods also the scrubber liquid was sampled. It was found that mercury entering the scrubber is efficiently oxidized at normal operating conditions. An increased fraction of elemental gaseous mercury was found in flue gases after the scrubber at redox potentials below 700 mV and pH below 1. The mercury emissions were more dependent on the scrubber liquid composition than on the inlet concentrations. Equilibrium calculations of the mercury speciation in the scrubber liquid and flue gases after the scrubber showed that mercury is normally emitted as HgBr2 or HgCl2. Elemental bromine and chlorine are formed in the scrubber. Both species probably take part in the mercury oxidation process. Results from 18 months of dioxin sampling, using a continuous long term sampling device (the AMESA system) were evaluated by multivariate data analyses. It was shown that the elevated emissions observed were caused by a memory effect in the scrubber due to high start-up concentrations. The memory effect was modelled in a diffusion model where the dioxins were considered to be physically absorbed in and desorbed from the polypropylene fillings of the scrubber. From the diffusion model, the diffusivities for tetra to hexa chlorinated dioxins in polypropylene were calculated. The diffusivity of tetra chlorinated dioxins was calculated to be 10-14 m2/s. The diffusivity decreases with increasing chlorination. For hexa chlorinated dioxins it was calculated to be 10-16 m2/s. Brominated dioxins were measured before and after a fabric filter. The fraction of brominated dioxins increased after the filter. Di brominated furans were the most abundant homologue.
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| 3. |
- Völz, Sebastian, 1980, et al.
(författare)
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Renal sympathetic denervation in Sweden : a report from the Swedish registry for renal denervation
- 2018
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Ingår i: Journal of Hypertension. - : Lippincott Williams & Wilkins. - 0263-6352 .- 1473-5598. ; 36:1, s. 151-158
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Tidskriftsartikel (refereegranskat)abstract
- Background: Renal denervation (RDN) is a catheter-based intervention to treat patients with resistant hypertension. The biological effects of RDN are not fully understood, and randomized controlled trials have generated conflicting evidence. This report presents data from the Swedish Registry for Renal Denervation, an investigator-driven nationwide registry. Purpose: To assess the safety and efficacy of RDN on patients with resistant hypertension in a real-world clinical setting. Methods: This nationwide database contains patient characteristics, procedural details, and follow-up data on all RDN procedures performed in Sweden. Consecutive procedures between 2011 and 2015 were included. Results: The data analysis consists of 252 patients (mean age 61 +/- 10 years, 38% women; mean 4.5 +/- 1.5 antihypertensive drugs). Office SBP and DBP and 24-h ambulatory blood pressure (BP) decreased 6 months after RDN (176 +/- 23/97 +/- 17 to 161 +/- 26/91 +/- 16 mmHg, both P<0.001; and 155 +/- 17/89 +/- 14 to 147 +/- 18/82 +/- 12 mmHg, both P<0.001). Significant office and ambulatory BP reductions persisted throughout the observation period of 36 months. Major procedure-related vascular complications occurred in four patients. Renal function and number of antihypertensive drugs were unchanged during follow-up. Conclusion: In this complete national cohort, RDN was associated with a sustained reduction in office and ambulatory BP in patients with resistant hypertension. The procedure proved to be feasible and associated with a low-complication rate, including long-term adverse events.
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| 4. |
- Abrahamsson, Hans, 1966, et al.
(författare)
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Turbulence in a Two-Dimensional Wall-Jet - Experiments and Modeling
- 1992
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Ingår i: 13th Turbulence Conference in Missouri-Rolla..
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Konferensbidrag (refereegranskat)abstract
- An experimental and numerical investigation of the turbulence field in a two-dimensional wall-jet has been carried out in a well-defined geometry. The measurements were performed using a hot-wire technique and the calculations were carried out with a standard k-ε model as well as an algebraic stress model (ASM), using elliptic solvers. For the mean velocity field, good agreements were found between the measurements and the calculations. The measurements of the turbulence intensities reveal two maxima in the stream-wise and span-wise components, while only one maximum was found in the normal component. Also in the shear stress two maxima were found. A comparison between calculations and measurements indicates that improved turbulence models are needed.
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| 8. |
- Allard, Bert, et al.
(författare)
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Actinide Sorption on Rock Minerals
- 1981
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Ingår i: Proceedings of the International Seminar on Chemistry and Process Engineering for High Level Liquid Waste. ; Jül Conf 42
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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