| 1. |
- Klaric, Lucija, et al.
(författare)
-
Mendelian randomisation identifies alternative splicing of the FAS death receptor as a mediator of severe COVID-19.
- 2021
-
Ingår i: medRxiv : the preprint server for health sciences. - : Cold Spring Harbor Laboratory. ; , s. 1-28
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Severe COVID-19 is characterised by immunopathology and epithelial injury. Proteomic studies have identified circulating proteins that are biomarkers of severe COVID-19, but cannot distinguish correlation from causation. To address this, we performed Mendelian randomisation (MR) to identify proteins that mediate severe COVID-19. Using protein quantitative trait loci (pQTL) data from the SCALLOP consortium, involving meta-analysis of up to 26,494 individuals, and COVID-19 genome-wide association data from the Host Genetics Initiative, we performed MR for 157 COVID-19 severity protein biomarkers. We identified significant MR results for five proteins: FAS, TNFRSF10A, CCL2, EPHB4 and LGALS9. Further evaluation of these candidates using sensitivity analyses and colocalization testing provided strong evidence to implicate the apoptosis-associated cytokine receptor FAS as a causal mediator of severe COVID-19. This effect was specific to severe disease. Using RNA-seq data from 4,778 individuals, we demonstrate that the pQTL at the FAS locus results from genetically influenced alternate splicing causing skipping of exon 6. We show that the risk allele for very severe COVID-19 increases the proportion of transcripts lacking exon 6, and thereby increases soluble FAS. Soluble FAS acts as a decoy receptor for FAS-ligand, inhibiting apoptosis induced through membrane-bound FAS. In summary, we demonstrate a novel genetic mechanism that contributes to risk of severe of COVID-19, highlighting a pathway that may be a promising therapeutic target.
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| 2. |
- Abou-Taouk, Abdallah, 1982, et al.
(författare)
-
CFD analysis of a SGT-800 burner in a combustion RIG
- 2016
-
Ingår i: ASME Turbo Expo, June 13 – 17, 2016, Seoul, South Korea. ; 4B-2016
-
Konferensbidrag (refereegranskat)abstract
- This work focuses on 3D turbulent reacting flow modeling of a SGT-800 3rd generation dry low emission (DLE) burner at both atmospheric and engine-like conditions. At atmospheric pressure the burner is fitted in a test rig with high pre-heating of the incoming air. To reduce the computational cost, the M4 mechanism previously developed by Abou-Taouk et al. (2013) is used for operating pressure of 1 bar. A new novel optimized 4-step reaction mechanism for methane-air mixture is developed in the present work at an operating pressure of 20 bar. The mechanism is based on a large sample of detailed chemistry solutions that are processed by an iterative optimization procedure. This leads to a reduced 4-step mechanism, reproducing the targeted detailed chemistry solutions in terms of laminar flame speeds, species profiles and temperatures. The CFD simulations are performed using the combined eddy dissipation model / finite rate chemistry (EDM/FRC) turbulence chemistry interaction model. The turbulence is modeled using both the k-ω SST and the scale adaptive simulation (SAS) turbulence models. A comprehensive testing and measurement campaign carried out at atmospheric pressure for this burner was previously performed in a combustion test rig. The CFD results are compared to measurement data which includes for example flame position and pressure drop.
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| 3. |
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| 4. |
- Andersson, Kristoffer, 1976, et al.
(författare)
-
Resistive SiC-MESFET mixer
- 2002
-
Ingår i: IEEE Microwave and Wireless Components Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1531-1309 .- 1558-1764. ; 12:4, s. 119-121
-
Tidskriftsartikel (refereegranskat)abstract
- A single-ended silicon carbide resisitve MESFET mixer with minimum conversion loss (CL) of 10.2 dB and an input third order intercept point of 35.7 dB at 3.3 GHz was designed and characterized. A lumped-element, large-signal model was used for modeling the device. The drain-source resistance was measured by taking the real part of the output port impedence. Analysis suggested that the optimum gate bias for minimum CL was -6.7 V.
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| 5. |
- Andersson, Niklas, 1976, et al.
(författare)
-
A Novel Solver Acceleration Technique Based on Dynamic Mode Decomposition
- 2014
-
Ingår i: 11th World Congress on Computational Mechanics, WCCM 2014. - 9788494284472 ; , s. 4832-4851
-
Konferensbidrag (refereegranskat)abstract
- The speed up of finite-volume solvers for compressible flows is a difficult task. There are several ways to achieve solver speed-up, more or less difficult to implement and more or less suitable for implementation in a parallel, unstructured type of solver. Examples of such techniques are the multi-grid method and implicit residual smoothening. In this article, a solver acceleration technique based on Dynamic Mode Decomposition (DMD) is proposed. The technique does not depend on data or mesh structure and is thus as straightforward to implement in an unstructured parallel code as in a structured sequential code. The main idea behind the proposed method is that one can use the information in flow field modes extracted using the DMD technique to find a correction that will bring the solution closer to a steady state condition, i.e. the method is only applicable to steady-state problems. In the presented work the DMD-based acceleration technique has been implemented in a massively parallel block-structured finite-volume Navier-Stokes solver for compressible flows. The method has been tested on a turbine cascade case with promising results. To the knowledge of the authors, the proposed method is not previously published in the open literature.
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| 6. |
- Andersson, Niklas, 1976, et al.
(författare)
-
A Study of Mach 0.75 Jets and Their Radiated Sound Using Large-Eddy Simulation
- 2004
-
Ingår i: AIAA 2004-3024, proc. of 10th AIAA/CEAS Aeroacoustics Conference, May 10-12, 2004.
-
Konferensbidrag (refereegranskat)abstract
- Large-Eddy Simulations (LES) of a compressible nozzle/jet configuration have been carried out. Two jets were simulated, an isothermal jet and a jet with a higher temperature than the quiescent surrounding air. The Mach number was in both cases 0.75 and the jet Reynolds number was 50,000. Sound pressure levels in far-field observer locations were evaluated using Kirchhoff surface integration. The Favre filtered Navier-Stokes equations were solved using a finite volume method solver with a low-dissipation third-order upwind scheme for the convective fluxes, a second-order centered difference approach for the viscous fluxes and a three-stage second-order Runge-Kutta technique in time. The computational domain was discretized using a block structured boundary fitted mesh with approximately 3,000,000 cells. The calculations were performed on a parallel computer, using message-passing interface (MPI). A compressible form of Smagorinsky's subgrid scale model was used for computation of the subgrid scale stresses. Absorbing boundary conditions based on characteristic variables were adopted for all free boundaries. Velocity components specified at the entrainment boundaries were estimated from corresponding Reynolds Averaged Navier-Stokes (RANS) calculations, which enable the use of a rather narrow domain. This, furthermore, ensures that the correct amount of fluid is entrained into the domain. Two-point space-time correlations were obtained for locations in the shear layer center, from which length and time scales of turbulence structures were evaluated. Predicted near-field flow statistics and far-field sound pressure levels (SPL) are both in good agreement with experiments. Predicted (SPL) are for all observers locations, where evaluated, within a 3.0 [dB] deviation from measured levels and for most locations within a 1.0 [dB] deviation. Experimental data used for validation were provided by Laboratoire dEtude Aeròdynamiques, Poitiers, France.
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| 7. |
- Andersson, Niklas, 1976, et al.
(författare)
-
Effects of Inflow Conditions and Subgrid Model on LES for Turbulent Jets
- 2005
-
Ingår i: AIAA 2005-2925, proc. of 11th AIAA/CEAS Aeroacoustics Conference, May 23-25, 2005, Monterey, California.
-
Konferensbidrag (refereegranskat)abstract
- The turbulent mixing process prescribing the spreading rate of the jet and the length of the potential core region is influenced by a number of factors. Using large-eddy simulation (LES), the four factors that are believed to be the most important in this respect are: subgrid-scale properties, the accuracy of the numerical scheme, the entrainment boundary conditions, and the inflow conditions. In a previously performed study of a subsonic (Mach 0.75) jet, the turbulence mixing was found to be too efficient and hence the length of the potential core region was underpredicted. In that study indications were found of that the overpredicted mixing was due to the inflow conditions. For a model nozzle, capturing the initial turbulent shear flow might not be of that great importance for accurate prediction of radiated sound since most of these effects will appear in the high-frequency range. When dealing with real engine geometries, however, it becomes quite important. Moreover, methods for industrial use have to cope with complex geometries and high temperature and velocity ratios making the ability to capture the initial flow physics even more important. In the present work LES has been used for the same Mach 0.75 jet. The acoustic field is extracted to the far field using Kirchhoff surface integration. The effects of inflow conditions, Reynolds number, and subgrid-scale model on flowfield and acoustic signature are investigated.The Favre-filtered Navier-Stokes equations were solved using a finite-volume method solver with a low-dissipation third-order upwind scheme for the convective fluxes, a second-order centered difference approach for the viscous fluxes and a three-stage second-order Runge-Kutta technique in time. The computational domain was discretized using a block-structured boundary-fitted mesh with approximately 3,000,000 cells. The calculations were performed on a parallel computer, using message-passing interface (MPI). A compressible form of Smagorinsky's subgrid-scale model was used to compute the subgrid-scale stresses. Absorbing boundary conditions based on characteristic variables were adopted for all free boundaries.
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| 8. |
- Andersson, Niklas, 1976, et al.
(författare)
-
Investigation of an Isothermal Mach 0.75 Jet and its Radiated sound Using Large-Eddy Simulation and Kirchhoff Surface Integration
- 2005
-
Ingår i: International Journal of Heat and Fluid Flow. ; 26, s. 393-410
-
Tidskriftsartikel (refereegranskat)abstract
- A large-eddy simulation (LES) of a compressible nozzle/jet configuration has been carried out. An isothermal Mach 0.75 jet was simulated. The Reynolds number based on the jet velocity at the nozzle exit plane and the nozzle diameter was 50,000. The Favre filtered Navier-Stokes equations were solved using a finite volume method solver with a low-dissipation third-order upwind scheme for the convective fluxes, a second-order centered difference approach for the viscous fluxes and a three-stage second-order Runge-Kutta time marching technique. A compressible form of Smagorinsky's subgrid scale model was used for computation of the subgrid scale stresses. The computational domain was discretized using a block structured boundary fitted mesh with approximately 3,000,000 cells. The calculations were performed on a parallel computer, using message-passing interface (MPI). Absorbing boundary conditions based on characteristic variables were adopted for all free boundaries. Velocity components specified at the entrainment boundaries were estimated from a corresponding Reynolds Averaged Navier-Stokes (RANS) calculation, which enabled the use of a rather narrow domain. In order to diminish disturbances caused by the outlet boundary, a buffer layer was added at the domain outlet. Kirchhoff surface integration using instantaneous pressure data from the LES was utilized to obtain far-field sound pressure levels in a number of observer locations. The predicted sound pressure levels were for all observer locations within a 3dB deviation from the measured levels and for most observer locations within a 1dB deviation. Aerodynamic results and predicted sound pressure levels are both in good agreement with experiments. Experimental data were provided by Laboratoire dEtude Aeròdynamiques, Poiters, France.
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| 9. |
- Andersson, Niklas, 1976, et al.
(författare)
-
Large-Eddy Simulation of a Mach 0.75 Jet
- 2003
-
Ingår i: AIAA 2003-3312, proc. of 9th AIAA/CEAS Aeroacoustic Conference, May 12-14, 2003.
-
Konferensbidrag (refereegranskat)abstract
- A large-eddy simulation (LES) of a compressible nozzle/jet configuration has been carried out. A cold Mach 0.75 jet was simulated. The Reynolds number based on the jet velocity at the nozzle exit plane and the nozzle diameter was 50,000. The Favre filtered Navier-Stokes equations were solved using a finite volume method with a low dissipative third order upwind scheme for the convective fluxes, a second order centered difference approach for the viscous fluxes and a three-stage second order Runge-Kutta time marching technique. A compressible form of Smagorinsky's sub-grid scale model was used for computation of the sub-grid scale stresses. The calculations were performed using a block structured boundary fitted mesh with approximately 3,000,000 cells. The calculations have been performed on a parallel computer, using message-passing interface (MPI). Absorbing boundary conditions based on characteristic variables were adopted for all free boundaries. Velocity components specified at the entrainment boundaries were estimated from a corresponding Reynolds Averaged Navier-Stokes (RANS) calculation. In order to diminish disturbances caused by the outlet boundary a buffer layer was added at the domain outlet. Kirchhoff surface integration has been utilized to obtain far-field sound pressure levels in a number of observer locations using instantaneous pressure from the LES. Aerodynamic results and predicted sound pressure levels are both in good agreement with experiments. Experimental data were provided by Laboratoire dEtude Aeròdynamiques, Poiters, France.
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| 10. |
- Andersson, Niklas, 1976, et al.
(författare)
-
Large-Eddy Simulation of Subsonic Turbulent Jets and Their Radiated Sound
- 2005
-
Ingår i: AIAA Journal. ; 43:9, s. 1899-1912
-
Tidskriftsartikel (refereegranskat)abstract
- Large-Eddy Simulations (LES) of a compressible nozzle/jet configuration have been carried out. Two jets were simulated, an isothermal jet and a jet with a higher temperature than the quiescent surrounding air. The Mach number was in both cases 0.75 and the jet Reynolds number was 50,000. Sound pressure levels in far-field observer locations were evaluated using Kirchhoff surface integration. The Favre filtered Navier-Stokes equations were solved using a finite volume method solver with a low-dissipation third-order upwind scheme for the convective fluxes, a second-order centered difference approach for the viscous fluxes and a three-stage second-order Runge-Kutta technique in time. The computational domain was discretized using a block structured boundary fitted mesh with approximately 3,000,000 cells. The calculations were performed on a parallel computer, using message-passing interface (MPI). A compressible form of Smagorinsky's subgrid scale model was used for computation of the subgrid scale stresses. Absorbing boundary conditions based on characteristic variables were adopted for all free boundaries. Velocity components specified at the entrainment boundaries were estimated from corresponding Reynolds Averaged Navier-Stokes (RANS) calculations, which enable the use of a rather narrow domain. This, furthermore, ensures that the correct amount of fluid is entrained into the domain. Two-point space-time correlations were obtained for locations in the shear layer center, from which length and time scales of turbulence structures were evaluated. Predicted near-field flow statistics and far-field sound pressure levels (SPL) are both in good agreement with experiments. Predicted (SPL) are for all observers locations, where evaluated, within a 3.0 [dB] deviation from measured levels and for most locations within a 1.0 [dB] deviation. Experimental data used for validation were provided by Laboratoire dEtude Aeròdynamiques, Poiters, France.
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| 11. |
- Andersson, Niklas, 1976, et al.
(författare)
-
LES Prediction of Flow and Acoustic Field of a Coaxial Jet
- 2005
-
Ingår i: AIAA 2005-2884, proc. of 11th AIAA/CEAS Aeroacoustics Conference, May 23-25, 2005, Monterey, California.
-
Konferensbidrag (refereegranskat)abstract
- A compressible high-subsonic coaxial jet has been simulated using large-eddy simulation (LES). The acoustic field was extended to the far field using Kirchhoff surface integration. The jet Mach number based on the local speed of sound is approximately 0.9 for both the primary and secondary stream. The static temperature in the primary stream is three times that of the secondary stream. In order to resolve the acoustic field, it is desirable to have a computational domain with a rather large radial extent and a mesh that is relatively fine even in the far-field regions. Furthermore, the mesh should be as equidistant as possible so as to minimize the introduction of numerical errors. In order to keep the number of cells down, the computational domain was divided into three regions: a well resolved near-wall LES region, a medium-resolution LES region optimized for propagation of acoustic waves, and a coarse LES region. Over the interfaces between these regions, the number of cells is increased by factor two in each direction. Special treatment of the interfaces between the regions is utilized in order to minimize undesirable numerical errors. The radial extent of the computational domain increases downstream such that the flow in the outer boundary region can be assumed to be irrotational and axisymmetric. Hence, the flow outside the three-dimensional computational domain can be represented by a less expensive two-dimensional axisymmetric calculation. The interface between the full 3D LES region and the 2D region is based on azimuthally averaged quantities and acts as an absorbing boundary condition. The Favre-filtered Navier-Stokes equations were solved using a finite-volume method solver with a low-dissipation third-order upwind scheme for the convective fluxes, a second-order centered difference approach for the viscous fluxes and a three-stage second-order Runge-Kutta technique in time. The computational domain was discretized using a block-structured boundary-fitted mesh with approximately 20,000,000 nodes. The calculations were performed on a parallel computer, using message-passing interface (MPI). A compressible form of Smagorinsky's subgrid-scale model was used to compute the subgrid-scale stresses.
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| 12. |
- Andersson, Niklas, 1976, et al.
(författare)
-
Numerical Simulation of Stirling Engines Using an Unsteady Quasi-One-Dimensional Approach
- 2015
-
Ingår i: Journal of Fluids Engineering, Transactions of the ASME. - : ASME International. - 1528-901X .- 0098-2202. ; 137:5, s. Art. no. 051104-
-
Tidskriftsartikel (refereegranskat)abstract
- An existing computer code for solving the quasi-one-dimensional flow equations governing unsteady compressible flow in tubes with smoothly varying cross-section areas, has been adapted to the simulation of the oscillatory flow in Stirling engines for engine design purposes. By utilizing an efficient smoothing algorithm for the area function that preserves the total volume of the tube, it has been possible to achieve a highly accurate and fully conservative numerical scheme. Sub-models for wall friction and heat transfer have been added, enabling the simulation of gas heaters, gas coolers, and regenerators. The code has been used for the modeling of an alpha-type Stirling engine and validated for a range of operating conditions with good results.
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| 13. |
- Andersson, Niklas, 1976, et al.
(författare)
-
Prediction of flowfield and acoustic signature of a coaxial jet using RANS-based methods and large-eddy simulation
- 2008
-
Ingår i: International Journal of Aeroacoustics. - : SAGE Publications. - 1475-472X .- 2048-4003. ; 7:1, s. 23-40
-
Tidskriftsartikel (refereegranskat)abstract
- The feasibility of using large-eddy simulation (LES) for jet noise predictions has been discussed in several publications. The vast majority of these studies are, however, restricted to fairly simple geometries and moderate Reynolds numbers flows. Recent studies have shown that LES-based methods can be used for realistic flows and complex geometries with promising results. With continuously increased computer capacity and with the possibility to perform computations in parallel on PC-clusters, the possibility of using LES for industrial applications is increasing. However, although, the complexity of configurations for which LES may be used is approaching that of a real jet engine, due to high demands for computational power and long turn-over times LES is still not feasible for industrial use. For low-noise nozzle design, engineering tools with short turn-over time, accurate enough for prediction of noise trends are therefore needed. In the development of such methods, LES can provide data suitable for method validation. In the present work, the high-subsonic flow in an axisymmetric coaxial nozzle/jet configuration is studied. Flowfield predictions obtained using an axisymmetric RANS solver for compressible flows and predicted acoustic signature obtained using a method based on RANS and Lighthill's acoustic analogy are compared with flowfield and radiated sound predictions obtained using LES combined with Kirchhoff surface integration. In the predicted flow statistics, the most noticeable difference between RANS and LES results is that the RANS calculation gives somewhat lower levels of turbulence kinetic energy in the shear layers in the near-nozzle regions and hence the LES jet mixes somewhat faster and thus the potential core region is shorter in this simulation.
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| 14. |
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| 15. |
- Björk, Mikael, et al.
(författare)
-
Marinarkeologisk undersökning och dokumentation av skeppsvraket Constantia : RAÄ Torhamn 96 (L1978:1899)
- 2024
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Blekinge museum har på uppdrag av Länsstyrelsen i Blekinge undersökt och dokumenterat vraket efter flöjtskeppet Constantia (1676), beläget öster om Inlängan i Blekinge skärgård. Lämningen dokumenterades genom fotogrammetri och manuell uppmätning. Därutöver sågades fem prov för dendrokronologisk analys och ett fyra tegelstenar bärgades för ICP-analys. Området runt vraket metalldetekterades och flera större utslag noterades, möjligtvis kanoner. På lämningen påträffades en träsked samt flera metallfragment från en klocka vilka skyddsbärgades efter samråd med Länsstyrelsen. Undersökningen visar att lämningen trots sitt nedbrutna tillstånd innehåller flera välbevarade och orörda arkeologiska kontexter vilka kan ge en unik inblick i livet ombord på ett krigsfartyg under stormaktstiden och inte minst användningen av bestyckade handelsfartyg. Därutöver illustrerar hela händelseförloppet kring Constantias förlisning på det strategiska behovet av en flottbas i södra Östersjön, ett behov som Karlskrona därefter kommit att tillgodose.
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| 16. |
- Carlborg, Niklas, 1990, et al.
(författare)
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The Scope of Autonomy Model – Development of Teaching Materials for Computational Thinking in Primary School
- 2018
-
Ingår i: ACM International Conference Proceeding Series. - New York, NY, USA : ACM. ; Part F137702, s. 37-44, s. 37-44
-
Konferensbidrag (refereegranskat)abstract
- During the 21st century there has been an increasing interest in the field of computational thinking as a consequence of the ever faster technical development. However, educating future generations in programming and computational thinking is not trivial. Many different platforms and teaching approaches can be used for this purpose. Inspired by the UK initiative with BBC micro:bit, this paper strives to identify what may be important to consider when designing teaching materials with the micro:bit for training Swedish primary school pupils’ computational thinking skills relating to mathematical and technical school subjects. This has been investigated in an iterative process, by conducting 21 workshops with the goal to support primary school teachers in developing micro:bit teaching materials. The contribution of this paper is the Scope of autonomy model, which is based on the relation between pupils learning potential, their risk of feeling overwhelmed and the amount of choices provided in exercises. The model aim to support teachers in developing material for teaching programming and computational thinking in accordance with the new curriculum.
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| 17. |
- Carlborg, Niklas, et al.
(författare)
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The scope of autonomy when teaching computational thinking in primary school
- 2019
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Ingår i: International Journal of Child-Computer Interaction. - : Elsevier BV. - 2212-8689 .- 2212-8697. ; 21, s. 130-139
-
Tidskriftsartikel (refereegranskat)abstract
- During the 21st century, there has been an increased interest in the field of computational thinking as a consequence of the ever faster technical development. However, educating future generations in programming and computational thinking is not trivial. Many different platforms and teaching approaches can be used for this purpose. Inspired by the UK initiative with BBC micro:bit, this paper strives to identify what may be important to consider when designing teaching materials with the BBC micro:bit for training Swedish primary school learners’ computational thinking skills relating to mathematical and technical school subjects. This has been investigated in an iterative process, by conducting 21 workshops with the goal to support primary school teachers in developing BBC micro:bit teaching materials. The contribution of this paper is the Scope of autonomy model, which is based on the relation between learning potential, the risk of feeling overwhelmed, and the amount of choices provided in exercises. The model aim to support teachers in developing and appropriating material for teaching programming and computational thinking with individual progression in accordance with the new curriculum.
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| 18. |
- Daly, Aoife, et al.
(författare)
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Neptunus and To Løver : An Archaeological, Archival, and Dendrochronological Survey of Two Danish Prize Ships, Scuttled in the Stockholm Archipelago in 1659
- 2024
-
Ingår i: Acta Archaeologica. - 0065-101X .- 1600-0390. ; 94:1, s. 176-188
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Tidskriftsartikel (refereegranskat)abstract
- We report the archaeological survey, dendrochronological analysis, and archival research concerning two shipwrecks located in shallow waters outside Vaxholm in the Stockholm Archipelago, Baltic Sea. According to oral tradition, the two wrecks are the remains of Neptunus and To Løver, two former Danish warships that were taken as prizes at the battle of Fehmarn in 1644. The Swedish navy then used the two ships until 1659, when they were reportedly scuttled as a blockage along the sea route towards Stockholm. Before being intentionally scuttled, the two ships drifted away and sank. The work presented in this article confirms the substance of the tradition and reports that substantial portions of the two ships are preserved. Moreover, the two wrecks shed light on the scuttling process and the construction of an underwater barrier.
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| 19. |
- Eriksson, Lars-Erik, 1950, et al.
(författare)
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Development of a Cooled Radial Flameholder for the F404/RM12 Afterburner: Part III Afterburner Rumble Prediction and Suppression
- 2003
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Ingår i: ISABE-2003-1060, proc. of 16th ISABE Conf, Cleveland Ohio, September 2003.
-
Konferensbidrag (refereegranskat)abstract
- One-dimensional methods used for solving acoustic instabilities are of doubtful value in the design of afterburner systems. In this paper a three-dimensional method developed and used at Volvo Aero Corporation is described. The method deals with the mean flow and the perturbation flow separately. The perturbation part is based on the linearized Euler equations (time domain) for compressible multi-species flow together with a spectrum trans-formation and Arnoldis method for eigenmode extraction.
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| 20. |
- Eriksson, Niklas, 1976-
(författare)
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A New View of the 'Edesö Wreck' : identifying the Swedish naval vessel Bodekull, built 1659–1661 and sunk 1678 from written sources
- 2018
-
Ingår i: International Journal of Nautical Archaeology. - : Informa UK Limited. - 1057-2414 .- 1095-9270. ; 47:2, s. 391-404
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Tidskriftsartikel (refereegranskat)abstract
- This article complements the archaeological account of the so-called Edeso Wreck' with archival research that has led to its identification. In 1659 the Swedish King Karl X Gustav ordered a number of vessels for transport of horses and soldiers while at war with Denmark. The king died just a few months later, the war with Denmark was aborted, and the unfinished vessels were rebuilt to serve other purposes. One of these was Bodekull, built under English master shipwright Thomas Day between 1659 and 1661. In October 1678 Bodekull sank in the Stockholm archipelago. Alterations made during construction mentioned in written sources have been noted on the wreck and strengthen the argument for the identification.
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| 21. |
- Eriksson, Niklas, 1976-
(författare)
-
An early "half carvel" in the Northern Baltic
- 2008
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Ingår i: Maritime Archaeology Newsletter from Denmark. - Esbjerg. - 1902-0708. ; 23:1, s. 4-9
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 22. |
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| 23. |
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| 24. |
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| 25. |
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| 26. |
- Eriksson, Niklas, 1976-
(författare)
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Baltic and east European shipbuildinginfluences in the Swedish Empire : tracing local and inter-regionalshipbuilding traditions from the armedvessel Bodekull, built 1659-1661 and sunk 1678
- 2021
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Ingår i: Open Sea, Closed Sea: Local and Inter-Regional Traditions in Shipbuilding. - Marseille : CNRS Editions. - 9782271129727 ; , s. 51-56
-
Bokkapitel (refereegranskat)abstract
- Research in the Swedish military archives has revealed the identity of the ‘Edesö Wreck’ as the Bodekull belonging to the Swedish navy. The vessel was one of around 45 struss vessels ordered by King Karl X Gustav in 1659 to be used to transport troops and horses between the Danish isles. As a consequence of the king’s sudden death in January 1660 and the end of the war against Denmark, the semi-finished purpose-built invasion fleet was rebuilt into vessels for which the navy had better use. It is still possible, however, to trace the original design of the vessel through the preserved hull structure.
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| 27. |
- Eriksson, Niklas, 1976-
(författare)
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Between Clinker and Carvel : Aspects of hulls built with mixed planking in Scandinavia between 1550 and 1990
- 2010
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Ingår i: Archaeologia Baltica. - Klaipeda : University of Klaipeda. - 1392-5520 .- 2351-6534. ; 14:2, s. 77-84
-
Tidskriftsartikel (refereegranskat)abstract
- Half-carvels are vessels on which the lowest part of the hull is built with overlapping strakes of planking, referred to as clinkerconstruction, and the uppermost parts of the hull are constructed with the planks laid side by side, in the carvel fashion. Thesemixed planking constructions occurred in the 16th century (as far as we know), but became very common in later centuries.The aim of this article is to highlight the existence of different versions of clinker construction, and to discuss some reasonsbehind the selection of the technique.
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| 28. |
- Eriksson, Niklas, 1976-
(författare)
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Between lion figureheads and lions of fashion
- 2020
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Ingår i: The imagery of the sea. - Stockholm : Bokförlaget Stolpe. - 9789198523799 ; , s. 223-231
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 29. |
- Eriksson, Niklas, 1976-
(författare)
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Bluffade Treileben?
- 2012
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Ingår i: Marinarkeologisk Tidskrift. - Stockholm : Marinarkeologiska Sällskapet. - 1100-9632. ; :3, s. 7-8
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 35. |
- Eriksson, Niklas, 1976-
(författare)
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Det stolta skeppet
- 2014
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Ingår i: Svenska sjömanstatueringar. - Stockholm : Medströms bokförlag. - 9789173291170 ; , s. 73-87
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Bokkapitel (populärvet., debatt m.m.)
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| 36. |
- Eriksson, Niklas, 1976-
(författare)
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Eftermedeltida skeppsvrak : reflektioner kring marinarkeologi och historisk arkeologi med exempel från Östersjö
- 2017
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Ingår i: Nordisk marinarkæologi fast forankret. - Rudkøbing : Langelands Museum. - 9788792619105 ; , s. 101-116
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Postmedieval shipwrecks: reflections on maritime archaeology and historical archaeology with examples from the Baltic Sea That the brackish water of the Baltic Sea provides ideal conditions for preservation of organic material is a well-known fact. With this in mind it is a bit surprising just how little archaeological efforts that has been put into surveying these wrecks. The majority of these remains date to the early modern period. The study of these remains are thus associated with the assets as well as problems associated with historical archaeology. This paper reviews some of the research efforts carried out on wrecks in the past with focus on the relationship between history and archaeology. It is argued that the often claimed unique archaeological potential of the Baltic wrecks, tend to become overshadowed by narratives sprung out of written sources. The paper ends with a couple of examples of discussions that are only possible to raise from well-preserved shipwrecks. Inspired by phenomenology and the current research on historical buildings it is argued that ‘the lived experience’ is a possible way forward to raise other questions and to highlight other aspects of the past. The examples discussed are the everyday environment onboard fluits, a very common type of merchant ship, and the famous naval ship Svärdet that went down during a fierce battle in 1676.
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| 39. |
- Eriksson, Niklas, 1976-
(författare)
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Figureheads and Symbolism Between the Medieval and the Modern : The ship Griffin or Gribshunden, one of the last Sea Serpents?
- 2020
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Ingår i: The Mariner's Mirror. - : Informa UK Limited. - 0025-3359 .- 2049-680X. ; 106:3, s. 262-276
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Tidskriftsartikel (refereegranskat)abstract
- The Griffin or, as it was sometimes called, Gribshunden (griffin hound) was a ship that belonged to the Danish–Norwegian King Hans. The ship sank in 1495 and was one of the largest and most modern warships of its day. In 2015 a peculiar figurehead carving was raised from the wreck. It is shaped like a beast swallowing a man screaming in agony. The question is, what this sculpture is meant to symbolize? This article aims to shed light on the enquiry through placing the sculpture in a wider chronological context. Against the background of a general overview, from the dragon heads of the late Iron Age to early modern figureheads, it is argued that the sculpture raised from the Griffin was carved in a period when figureheads did not relate to the ship’s name or owner, but that the monstrous head is an expression of the spirit or character of the vessel.
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- Eriksson, Niklas, 1976-
(författare)
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Förundersökningen av vraket i Åkroken
- 2007
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Ingår i: Marinarkeologisk tidskrift. - Stockholm. - 1100-9632. ; :4, s. 7-9
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 43. |
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| 44. |
- Eriksson, Niklas, 1976-
(författare)
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Gribshunden : medeltidens modernaste skepp
- 2019
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Ingår i: Gribshunden 1495. - Karlskrona : Blekinge museum. - 9789198259896 ; , s. 11-40
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Bokkapitel (populärvet., debatt m.m.)
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| 46. |
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| 47. |
- Eriksson, Niklas, 1976-
(författare)
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Gribshundens stävfigur
- 2021
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Ingår i: Saker. - Karlskrona : Blekinge museum. - 9789198346527 ; , s. 74-79
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Bokkapitel (populärvet., debatt m.m.)
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| 48. |
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| 49. |
- Eriksson, Niklas, 1976-
(författare)
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How Large Was Mars? An investigation of the dimensions of a legendary Swedish warship, 1563–1564
- 2019
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Ingår i: Mariner´s mirror. - : Informa UK Limited. - 0025-3359 .- 2049-680X. ; 105:3, s. 260-274
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Tidskriftsartikel (refereegranskat)abstract
- The Swedish warship Mars was considered to have been one of the largest ships in the world when it exploded and sank in 1564. The problem is that no written accounts clearly reveal its dimensions. This article reviews how different researchers have discussed the size of Mars in the past. It also aims to shed new light on this topic by using information from the archaeological survey carried out at the wreck site since 2011. Even if the result is approximate it clearly shows that Mars was indeed an impressively large ship by sixteenth century standards, but not as large as many previous researchers have thought.
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| 50. |
- Eriksson, Niklas, 1976-
(författare)
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Invasionsfartyget som blev en mjölskuta : identifieringen av ”Dalarövraket” som strussen Bodekull (1661-1678)
- 2018
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Ingår i: Forum navale. - 0280-6215 .- 2002-0015. ; :74, s. 12-53
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Tidskriftsartikel (refereegranskat)abstract
- In 2003 a well preserved shipwreck was discovered north of Dalarö in the Stockholm Archipelago. Artefacts indicated that the ship sank during the mid or later half of the 17th century. An archaeological survey revealed that even if the vessel was very small it showed many details that are usually found on large sailing warships, such as gun ports along the sides and a lion figure head. Despite the massive attention the wreck has achieved, from researchers, media and others, the original identity of the wreck has remained an open question until now. In the preserved minutes and letters of the Swedish Admiralty kept in the Military Archives reveal that the Swedish king Karl X Gustav ordered a number of small vessels to be used for transport of horses and soldiers in his war against Denmark in 1659. After the unpredicted death of the king, the campaign against Denmark was cancelled and the unfinished ships were rebuilt in different ways. One of these was Bodekull, which was built under supervision of the newly recruited English Master Shipwright Thomas Day between 1659 and 1661. As the design was changed during construction, several unique details, that are also visible on the wreck, are mentioned in the preserved correspondence between the shipyard and the Admiralty. In October 1678 the Bodekull was sent from Kalmar to grind cereals ata mill along the coast. Despite his instructions he sailed to Fagerholmen in the Stockholm archipelago. On its way back the ship hit a rock and sank. 20 barrels of water soaked flour was sent to Stockholm. This article summarizes the archival research that has led to the identification of the ship.
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