| 61. |
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| 62. |
- Jarl, Maria, 1973, et al.
(författare)
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Avslutning - skolan idag och i morgon
- 2020
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Ingår i: Utbildningens organisation och villkor, demokratins grunder. Maria Jarl, Hans Albin Larsson (red.). - Stockholm : Natur & Kultur. - 9789127825222 ; , s. 208-233
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 63. |
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| 64. |
- Johansson, Stefan, 1967
(författare)
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Micro-Flow Reactors for Kinetic Studies of Model Catalysts made by Electron-Beam Lithography
- 2000
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The main objective of this work is to explore the potential of using electron beam lithography (EBL) to prepare well defined supported model catalysts, which can be used for catalytic research. The work has involved three major areas (i) EBL-fabrication of catalysts, (ii) design of a micro-flow reactor for catalytic evaluation, and (iii) problem oriented research using EBL-fabricated model catalysts. With the EBL technique supported model catalysts have been prepared consisting of arrays of Pt particles on SiO2 and CeOx. To evaluate the catalytic performance of the EBL fabricated model catalysts, a specially designed low-flow micro reactor has been constructed. The main feature is a very low flow through the reactor (approx. 1 microliter/second ) to match the small overall precious metal surface area presently attainable with the EBL technique (on the order of 1 mm2) for small particle sizes (
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| 65. |
- Landström, Christoffer, 1982, et al.
(författare)
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Effects of Ground Simulation on the Aerodynamic Coefficients of a Production Car in Yaw Conditions
- 2010
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Ingår i: SAE 2010 World Congress and Exhibition; Detroit, MI; United States; 13 April 2010 through 13 April 2010. - 400 Commonwealth Drive, Warrendale, PA, United States : SAE International.
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Konferensbidrag (refereegranskat)abstract
- Automotive wind tunnel testing is a key element in the development of the aerodynamics of road vehicles. Continuous advancements are made in order to decrease the differences between actual on-road conditions and wind tunnel test properties and the importance of ground simulation with relative motion of the ground and rotating wheels has been the topic of several studies.This work presents a study on the effect of active ground simulation, using moving ground and rotating wheels, on the aerodynamic coefficients on a passenger car in yawed conditions. Most of the published studies on the effects of ground simulation cover only zero yaw conditions and only a few earlier investigations covering ground simulation during yaw were found in the existing literature and all considered simplified models. To further investigate this, a study on a full size sedan type vehicle of production status was performed in the Volvo Aerodynamic Wind Tunnel. The effect of active ground simulation in yawed wind conditions was investigated for different wheel and cooling air inlet configurations.Results show that aerodynamic drag increased more during yaw when using active ground simulation compared to stationary ground conditions. For some of the configurations this resulted in yaw ranges where active ground simulation produced higher aerodynamic drag than with stationary ground. This was mainly connected to the development of the front wheel wakes and the deflection of the windward wheel wake along the underbody during yaw. Aerodynamic lift generally decreased but the front and rear lift balance changed somewhat during yaw for some configurations. Local surface pressure measurements were used to identify important flow field changes and the integrated surface pressures showed a qualitative agreement with the measured drag and lift.
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| 66. |
- Landström, Catharina, 1964
(författare)
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Environmental participation: Practices engaging the public with science and governance
- 2020
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- This book introduces environmental participation as a distinct field comprising diverse practices. It presents examples of public participation specifically in environmental science, decision making and expertise. The first chapter introduces the science studies perspective and the key concepts that underpin the argument for approaching such a range of practices as a coherent field. The following three chapters explore a wide range of practical examples of how the public can participate in all three domains. Drawing on her experience with a variety of transdisciplinary projects Landström discusses topics including the coproduction of knowledge about flooding, community involvement with radioactive waste disposal and collaborative water quality modelling. She then goes on to cover citizen science and social movement expertise as environmental participation practices. The concluding chapter reflects on the challenges as well as future opportunities of environmental participation. This book is aimed at readers from a variety of academic and non-academic backgrounds and will be a great interest to social and natural scientists, students and practitioners.
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| 67. |
- Landström, Catharina, 1964, et al.
(författare)
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Filling the Gaps Between Observations With Data: Nature, Models and Human Agency
- 2020
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Ingår i: Society for Social Studies of Science (4S), 2020, Prague, August 18 - 21, 2020 : Locating and Timing Matters: Significance and agency of STS in emerging worlds.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- STS case studies have shown how observations and measurements of phenomena in nature are transformed into scientific data in different practices. In light of the rapid digitalisation and a growing interest in ‘big data’ it is important to continue investigating the ways in which environmental science produce scientific data for use in research and policy. This panel invites papers that discuss how environmental data generation and processing is mediated by models. There is a wide range of data collection practices in environmental science, ranging from remote sensing, to scientific field work, to citizen science observations. Data generation can also involve new mobile applications, or DIY counter monitoring, or computer model simulations. Papers analysing the many ways in which environmental data is collected by humans and non-humans are welcome. Regardless of the starting point, data must be processed to become useable in scientific analysis. As the increasing digitalisation produces a deluge of data to order in scientific classification schemes, the human ability to discern and judge is delegated to models. Modelling of environmental data also enacts human agency when filling the gaps between empirical measurements or observations. Data processing algorithms perform imagined epistemic subjects. The consequences of the merging of numbers representing nature, machine calculations and scientific skills in the generation of environmental data are important issues for STS investigation and we invite presentations of ongoing research into the relations between nature, models and human agency.
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| 68. |
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| 69. |
- Landström, Christoffer, 1982, et al.
(författare)
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Influences of Different Front and Rear Wheel Designs on Aerodynamic Drag of a Sedan Type Passenger Car
- 2011
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Ingår i: SAE technical paper. SAE 2011 World Congress and Exhibition, Detroit, 12 April 2011. - 400 Commonwealth Drive, Warrendale, PA, United States : SAE International.
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Konferensbidrag (refereegranskat)abstract
- Efforts towards ever more energy efficient passenger cars have become one of the largest challenges of the automotive industry. This involves numerous different fields of engineering, and every finished model is always a compromise between different requirements. Passenger car aerodynamics is no exception; the shape of the exterior is often dictated by styling, engine bay region by packaging issues etcetera. Wheel design is also a compromise between different requirements such as aerodynamic drag and brake cooling, but as the wheels and wheel housings are responsible for up to a quarter of the overall aerodynamic drag on a modern passenger car, it is not surprising that efforts are put towards improving the wheel aerodynamics. The actual force on the wheels is typically not a full quarter of the overall drag, but as the wheels strongly interact with several other key flow features such as cooling air flow, underbody flow and the base wake, the wheels have a large influence on the overall aerodynamic performance of the vehicle.This study investigates the potential of different wheel design parameters focusing on reduced aerodynamic drag. A correlation with experimental measurements on a full size vehicle is presented and several additional configurations are analyzed numerically using a standard automotive CFD approach. Furthermore, the potential of optimizing the front and rear wheels individually is investigated to some extend.Results show that closing most of the rear wheels results in local drag reductions along the rear end underbody, rear wheels and vehicle base. The fully covered rear wheel typically reduced base drag between 6-7 drag counts. Effects of covering the front wheels were more complex as both upstream and downstream flow regions were affected, and it was shown that for the vehicle investigated in this study a limited amount of outer radial covering of the wheel gave the largest drag reduction. The investigation of using different front and rear wheel designs showed that this concept have potential in reducing overall drag as it generated the largest drag reduction in this study of approximately 22 drag counts.
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| 70. |
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