| 1. |
- Gustafsson, Mats, et al.
(författare)
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Physical bounds on the partial realized gain
- 2010
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Ingår i: [Host publication title missing]. ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- An antenna identity, derived from the forward scattering sum rule, shows that the partial realized gain of an antenna is related to the polarizability of the antenna structure. The partial realized gain contains the mismatch, directivity, efficiency, and polarization properties of the antenna. The antenna identity expresses how the performance depends on the electrical size and shape of the antenna structure. It is also the starting point for several antenna bounds. In this paper, the identity, its associated physical bounds, and computational aspects of the polarizability dyadics are discussed.
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| 2. |
- Johansson, Björn, 1975, et al.
(författare)
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Sustainable Production by Integrating Business Models of Manufacturing and Recycling Industries
- 2011
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Ingår i: Proceedings of the 18th CIRP International Conference on Life Cycle Engineering. - 3642196918 ; , s. 723-
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Konferensbidrag (refereegranskat)abstract
- Future raw material shortage, high price levels and environmental regulations requires increased reuse of materials andcomponents. This will substantially influence conditions for both manufacturing and recycling industries, which need toinnovate their business models. Our hypothesis is that an integrated co-operation between organizations within these industries, employing symbiotic business models will increase the profitability and reduce the total environmental impact. Findings from interaction with manufacturing and recycling industries using a business model framework as baseline are presented. Results indicate that profit and decreased environmental effects can be achieved through symbiotic business models, but further development and implementation is needed.
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| 3. |
- Jonsson, Marie, 1979-, et al.
(författare)
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Force Feedback for Assembly of Aircraft Structures
- 2010
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Ingår i: Proceedings of the SAE 2010 Aerospace Manufacturing and Automated Fastening Conference & Exhibition. - SAE International : SAE International.
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Konferensbidrag (refereegranskat)abstract
- Variability in composite manufacture and the limitations in positional accuracy of common industrial robots have hampered automation of assembly tasks within aircraft manufacturing. One way to handle geometry variations and robot compliancy is to use force control. Force control technology utilizes a sensor mounted on the robot to feedback force data to the controller system so instead of being position driven, i.e. programmed to achieve a certain position with the tool, the robot can be programmed to achieve a certain force. This paper presents an experimental case where a compliant rib is aligned to multiple surfaces using force feedback and an industrial robot system from ABB. Two types of ribs where used, one full size carbon fiber rib, and one smaller metal replica for evaluation purposes. The alignment sequence consisted of several iterative steps and a search procedure was implemented within the robot control system. The technology has the potential to lessen the need for dedicated tooling, reduce the need for traditional workspace calibration and can be used in several other applications, such as pin and socket type assemblies found in pylons or landing gear or “part to part” assemblies such as leading edge ribs to spar.
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| 4. |
- Grönlund, Erik, et al.
(författare)
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Ekoteknik (Ecotechnics / Ecotehcnology) – 30 Years of Experience in Interdiciplinery Education
- 2014
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Ingår i: Proceedings of the 20th International Sustainable Development Research Conference Trondheim 18-20 June 2014. - Trondheim : Norwegian University of Science and Technology, Department of Product Design. - 9788291917344 ; , s. 17-21
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Konferensbidrag (refereegranskat)abstract
- An important part of a society’s resilience is how prepared it is to cope with the changing conditions during the alpha and omega phases according to resilience theory. Lars Thofelt, an academic from the mid Sweden region, early recognized this need for students to develop skills needed for a societal change, and devoted his life to pedagogy suitable for this. The main outcome of his achievement was the interdisciplinary university program in Ecotechnics/Ecotechnology (Ekoteknik in Swedish), at Mid Sweden University. Ecology, economy and technology in cooperation for sustainable development were the original approach, and still are.Thofelt’s ideas had a main focus of helping students develop their inherent capabilities of solving problems and overcome obstacles. After Thofelt’s 12 years at the program his ideas were carried on by former colleagues and students, and the teaching further developed with a mix of the Thofelt tradition and other experiences brought in by new employees. This paper describes this interdisciplinary teaching approach with special focus on development of resilience capacity in students.It was concluded that 1) a key element to develop resilience skills in students is to push them to a self-propelled learning behavior rather than traditional teaching, 2) not too easily provide the students with answers will develop their problem solving skills, 3) doing-before-reading teaching is more time consuming but seem to give deeper knowledge, 4) interdisciplinary teaching will in the long run benefit from having the interdisciplinary team within the department, rather than as a conglomerate of several departments.
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| 5. |
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| 6. |
- Pazsit, Imre, 1948, et al.
(författare)
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Reactor kinetics, dynamic response and neutron noise in molten salt reactors
- 2010
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Ingår i: International Conference on the Physics of Reactors 2010, PHYSOR 2010. - 9781617820014 ; 2, s. 979-999
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The dynamic space- and frequency dependent response of a Molten Salt Reactor (MSR) to stationary perturbations is investigated in a simple analytical model. The Green's function of the system is investigated in the general case of arbitrary fuel recirculation velocity and in the limiting case of infinite fuel velocity which permits closed form solutions both in the static and dynamic case. It is found that the amplitude of the induced noise is generally higher and the domain of the point kinetic behaviour valid up to higher frequencies than in a corresponding traditional system. This is due to the differing behaviour of the delayed neutron precursors as compared to the traditional case. The MSR equations are not self-adjoint and the adjoint equation and adjoint function have to be constructed, which is also done here. Finally the space-dependent neutron noise, induced by propagating perturbations of the absorption cross section is calculated. A number of interesting properties that are relevant to full size MSRs are found and interpreted. The results are consistent with those in traditional systems but the domains of various behaviour regimes (point kinetic, space dependent etc.) is shifted to higher frequencies or system sizes.
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| 7. |
- Yang, Jian, 1960, et al.
(författare)
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Development of the cryogenic 2-14 GHz eleven feed system for VLBI2010
- 2012
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Ingår i: 6th European Conference on Antennas and Propagation, EuCAP 2012; Prague; Czech Republic; 26 March 2012 through 30 March 2012. - 9781457709180 ; , s. 621-625
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Konferensbidrag (refereegranskat)abstract
- We present an overview of the recent developments of a cryogenic 2-14 GHz feed system for the Very Long Baseline Interferometry 2010 (VLBL2010) project. The developments include a new balun feeding network, a new circular Eleven feed, system noise temperature modeling and testing, integration with different low noise amplifiers (LNAs), and cryostat design and integration.
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| 8. |
- Akambih Tajam, Joseph, et al.
(författare)
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SMALL SCALE IN-SITU BIOREMEDIATIONOF DIESEL CONTAMINATED SOIL –SCREENING LIFE CYCLE ASSESSMENT OF ENVIRONMENTAL PERFORMANCE
- 2010
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Ingår i: ECO-TECH´10, 22-24 November 2010, Kalmar, Sweden. ; , s. 827-835
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Spillage of diesel oil and other petroleum products is a commonly creating need for siteremediation of contaminated soils. In Sweden the most common remediation action isexcavation of the contaminated soil and off site biological treatment by composting.However, a number of small sites spread out in rural areas end up low on priority lists, andwill not be attended to within foreseeable future if ever. For such areas a low cost, easy toapply remediation techniques would be of interest. Enhanced bioremediation of dieselcontaminants in soil by whey addition has been demonstrated in lab scale. Whey is a byproductfrom cheese production. A first pilot remediation trial on an actual site in Gäddede,County of Jämtland, was started the summer of 2010. Using this site as a case study ascreening life cycle assessment model has been set up. The goal of the study was toinvestigate the environmental performance of the whey method, to benchmark the wheymethod toward the excavation and composting practice and to identify environmental hotspots in the whey treatment life cycle. The study aims at establishing if further work shouldbe put into developing the method, or if the environmental performance is such that the wheymethod should be abandoned. It should be noted that even with a slightly worseenvironmental performance compared to other remediation alternatives whey treatment couldstill be of interest, since the small scale sites in rural areas we talk about here otherwise mostoften would not be attended to.Results from the screening life cycle assessment indicate a rather good environmentalperformance of the whey method, partly depending on impact category considered. For thewhey method, impacts from farming activities in the milk production chain allocated to thewhey give significant contributions. Transportation gives important impacts from both thewhey method and the excavation and off site composting, thus logistics should always beconsidered and optimized. The whey on-site treatment could be an interesting alternative forbioremediation especially at sites that would not otherwise be treated, due to small size orremote location.
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| 9. |
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| 10. |
- Jonsson, Bertil, et al.
(författare)
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Development of Whiplash associated Disorders for adult and child occupants in cars launched since the 1980s in different impact directions
- 2011
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Ingår i: 2011 IRCOBI Conference Proceedings - International Research Council on the Biomechanics of Injury (;Krakow;14 -16 September 2011). - : International Research Council on the Biomechanics of Injury. ; , s. 62-72, s. 62-72
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Studies have shown that crashworthiness of cars addressing fatal and serious injuries has generally improved over time. However, the development regarding injuries leading to medical impairment has not been shown to the same extent. The objective was to investigate the development of Whiplash associated Disorders (WAD) leading to long-term consequences for adult front seat occupants and for children 0-12 years of age in cars introduced at different year intervals and in different impact directions separated for gender. Long-term consequences were defined as occupants with WAD symptoms at least one month and those resulting in medical impairment. The developments were studied for cars divided into intervals according to year of introduction and for frontal, side and rear-end impacts. All adult occupants (35 611) and 76% of all children (973) reporting WAD between 1998 and 2008 were selected. Approximately 2% of the children reporting initial symptoms sustained medical impairment. The corresponding figure for adult occupants was approximately 10%. Between the introduction years 1980-84 and 2000-04 the proportions of adult occupants with medical impairment dropped by approximately 70% (both males and females) in frontal and rear-end crashes, while the reduction in lateral impacts appears to be somewhat lower. For children there is a tendency that the proportion of WAD increases in newer models in frontal collisions. The result indicates that protecting children facing forward deserves more attention from the automotive industry and governmental bodies.
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