| 1. |
- Berglund, Olof, et al.
(författare)
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Organochlorine accumulation and stable isotope ratios in an Atlantic salmon (Salmo salar) population from the Baltic Sea
- 2001
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Ingår i: Science of the Total Environment. - 1879-1026. ; 281:1-3, s. 141-151
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We investigated the organochlorine accumulation (p,p′-DDE and ∑PCB) and stable isotope ratios (N and C) in a migrating salmon (Salmo salar) population in the Baltic Sea. ∂15N in the entire population ranged from 11.7 to 13.7‰ and ∂13C ranged from −22.0 to −19.6‰. In the entire population, ∂15N were weakly related to p,p′-DDE and ∑PCB concentrations (r2=0.20 and 0.14, respectively). However, lipid content was a better predictor of organochlorine (OC) concentrations (r2=0.48 and 0.50, respectively). Lipid adjusted ∑PCB concentrations were not related to ∂15N, and lipid adjusted p,p′-DDE concentrations were only weakly related (r2=0.12). We divided the salmon population into three groups representing reproductive strategies: small males <5 kg (SM); large males >5 kg (LM); and females (F). ∂15N varied between the three reproductive strategies. The mean ∂15N for SM was 12.7±0.3‰, for F was 12.9±0.3‰, and for LM equalled 13.2±0.3‰. Lipid adjusted OC concentrations differed between the three reproductive strategies, with the females having the highest concentrations. We conclude that the ∂15N varied between reproductive strategies indicating differences in prey choice, but the lipid content was better able to predict OC concentrations than the trophic position of the salmon.
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| 2. |
- Berglund, Per-Olof
(författare)
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Investigation of acoustic source characterisation and installation effects for small axial fans
- 2003
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Fans are often used in equipment such as home appliances andelectronic equipment where the margin of profit is small butcustomers demands on a low noise level are high. Therefore,methods for predicting the noise emitted by an applicationincluding one or several fans are desirable in order toimprove, accelerate and reduce the cost of low-noise design.The Noise Shaping Technology (NST) has been developed withinthe EC-project NABUCCO in order to fulfil the aboverequirements on a prediction method. According to NST, thenoise source (not necessary a fan) is described by one orseveral noise descriptors, CSSs, and the correspondingtransmission paths through the structure described by one orseveral transfer functions, ACFs. In this thesis, theapplicability of NST is evaluated on a cabinet for electronicequipment where small axial cooling fans constitute the primarysources of the airborne sound.As an axial fan is a complex source of sound,simplifications are necessary when modelling its acousticproperties. Therefore, the sound radiation of an axial fan infree space was examined by expanding the generated soundpressure field into spherical harmonics. The conclusion on asource model for the cabinet example, where the fans are moreor less In-duct mounted, is a modified single axial dipole. Themodel is expected to be valid in the entire frequency range ofinterest except in the mid-frequency range where the modaldensity is low. In order to improve the source model in thisfrequency range, a future model based on a rotating dipole isproposed.The sound power of a small axial fan is measured in an ISO10302 test-rig. In order to take account of flow conditions,acoustically transparent ducts have been developed. These shallbe attached to the test-rig when measuring the sound power ofthe fan. A simple but practical method of how to correct thesound power for the baffling effect of the test-rig has alsobeen developed. Finally, the sound power can be converted intodipole force, which is the airborne CSS corresponding to thesingle axial dipole model.The corresponding airborne transfer function (ACF), i.e.,from dipole force at the source point to sound pressure at thereceiver point, is measured reciprocally by taking use ofLyamshevs reciprocity relation.From multiplication of the CSS and the ACF, the soundpressure can be predicted. The prediction shows quite goodagreement with the measured values.Keywords:axial fan, airborne sound, sourcecharacterisation, transmission path analysis, In-duct,spherical harmonics, rotating dipole, installation effects, ISO10302, flow conditions, baffling effect, acousticallytransparent ducts, Lyamshevs reciprocity relation, reciprocity,CSS, ACF, GSM, NST.
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| 3. |
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| 4. |
- Berglund, Sara, et al.
(författare)
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Gömd, glömd och fördömd
- 2002
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Ingår i: Öresundsbron på uppmärksamhetens marknad. Regionbyggare i evenemangsbranschen. - 9144040784
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Ericsson, Mikael, 1975-, et al.
(författare)
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Three Dimensional Simulation of Robot path, Heat Transfer and Residual Stresses of a TIG-welded Part with Complex Geometry
- 2002
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Ingår i: Trends in Welding Research: Proceedings of the 6th International Conference. ; , s. 973-978
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper a system is presented that combines a robot off-line programming software with a finite element model that predicts temperature-time histories and residual stress distributions. The objective is to develop a tool for the engineer where robot trajectories and welding process parameters can be optimized on parts with complex geometry. The system was evaluated on a stainless steel gas turbine component. Robot weld paths were defined off-line and automatically downloaded to the finite element program, where transient temperatures and residual stresses were predicted. Temperature dependent properties and phase change, were included in the analysis. Assumptions and principles behind the modeling techniques are presented together with predicted temperature histories, residual stresses, and fixture forces.
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| 6. |
- Johansson, Birgitta, et al.
(författare)
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Uppsalastudie av 20 husläkares roll i vården av cancerpatienter : Lättare att bedöma behovet av stöd om utförlig specialistinformation ges
- 2002
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Ingår i: Läkartidningen. - 0023-7205 .- 1652-7518. ; 99:8, s. 771-773
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this study is to describe the role of the GP in the care of one specified cancer patient per GP and to explore the GP’s knowledge about that patient’s disease and treatments. A further aim was to evaluate the effects of an extended information routine, including increased information from the specialist clinic to the GP. Twenty GPs were selected for a semi-structured interview about a patient randomised either to an extended GP information routine or to standard information. The results suggest that GPs are commonly involved in the care of cancer patients, particularly in the diagnosis of the disease but also during the period of treatments and follow-up. The information from the specialist clinic to the GP is insufficient in standard care. The extended information routine increased the GPs’ knowledge about the disease and treatments and facilitated their possibilities to determine patients’ need for support. However, this did not affect the extent of contacts with the patient.
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| 7. |
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