| 1. |
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| 2. |
- Bolin, Hans, et al.
(författare)
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Högskolan, museet och fältarkeologin
- 2014
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Ingår i: Tre år i Vång. - Karlskrona : Blekinge Museum. - 9789197980791 ; , s. 32-35
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Bokkapitel (populärvet., debatt m.m.)
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| 3. |
- Cassel, Björn, et al.
(författare)
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Deflections of an implant-supported cantilever beam subjected to vertically directed loads : in vitro measurements in three dimensions using an optoelectronic method. I. Experimental set-up.
- 2011
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Ingår i: Clinical Oral Implants Research. - : Wiley. - 0905-7161 .- 1600-0501. ; 22:3, s. 275-281
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Tidskriftsartikel (refereegranskat)abstract
- Aim: The aim of this in vitro study was to develop and test an experimental set-up consisting of a video camera and computer-based optoelectronic motion analysis system, synchronized with a loading device, for studying load-dependent deflections in three dimensions of single implant-supported cantilever beams.Material and methods: One Brånemark System implant was tightly screwed into a steel plate so that the entire implant became submerged. An abutment was attached to the implant and a cast 22-mm-long cantilever gold alloy beam incorporating a prefabricated gold cylinder was attached to the abutment with a prosthetic gold screw. A force transducer was glued on the upper surface of the beam end with its centre 19.4 mm from the centre of the implant abutment gold cylinder unit to register the applied load. A specially designed loading device was used to apply increasing vertical loads of the beam end via the transducer. The motion analysis system was synchronized with the transducer to enable measurements of three-dimensional positional changes of the beam end related to known loads.Results: Vertical loads from 15.7 to 40.4 N were applied resulting in vertical positional changes of the beam end ranging from 40.8 to 225.2 μm (z-axis). The corresponding horizontal changes perpendicular to the long axis of the beam (y-axis) due to counterclockwise horizontal rotation of the beam around the abutment- and prosthetic cylinder threads varied from 7.4 to 77.4 μm. This rotation changed the position of the beam end from 11.9 to 49.3 μm along the x-axis of the coordinate system toward the supporting implant.Conclusion: It was possible to arrange an experimental set-up for optoelectronic 3-D measurements within such a limited measurement volume that would permit satisfactory registrations of small load-dependent deflections of the prosthetic beam and implant components.
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| 4. |
- Cassel, Björn, et al.
(författare)
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Deflections of an implant-supported cantilever beam subjected to vertically directed loads : In vitro measurements in three dimensions using an optoelectronic method. II Analysis of methodological errors.
- 2010
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Ingår i: Clinical Oral Implants Research. - : Wiley. - 0905-7161 .- 1600-0501. ; 22:6, s. 645-650
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Tidskriftsartikel (refereegranskat)abstract
- Aim: The aim of this study was to evaluate the accuracy, i.e. trueness (validity) and precision (repeatability) for load-dependent deflections in three dimensions of an implant-supported cantilever beam obtained with an optoelectronic motion analysis system compared with a well-known reference method.Materials and methods: A cantilever beam with a length of 22 mm (roughly corresponding to the width of two premolars) was screw-connected to an implant–abutment unit stiffly anchored in a steel plate. The positional changes of beam-end were measured when the beam-end step by step was subjected to four loads, 15.5–40.1 N. This measurement procedure was repeated to comprise six consecutive measurements. The trueness of the method was estimated by comparing the data obtained for vertical deflections with those from a reference method where a hydraulic test system was used to measure the load-deflection ratios of the same beam when subjected to the four mentioned vertical loads.Results: All applied transducer-mediated loads had accuracies (truenesses and repeatabilities below 0.05%). Also, the trueness and precision of the reference method, regarding both movements (deflections) of tested objects and magnitude of applied loads, were tested and found to be high, not exceeding 0.5%.The optoelectronic method however underestimated the smallest vertical deflections for the cantilever beam when compared with the data obtained from the reference method. The underestimation was 26.4%, 15.5% and 8.6% for loads 15.5, 26.6 and 32.6 N, respectively, while there was a slight overestimation of 1.2% for 40.1 N. The precision for the optoelectronic method was found to be for z-axis 1.8 μm, y-axis 3.8 μm and x-axis 1.9 μm.Conclusion: It can be concluded that the trueness (validity) for the optoelectronic method is very high for deflections above 143 μm. The precision (repeatability) of the optoelectronic method was found to be very high.
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| 5. |
- Cassel, Björn, et al.
(författare)
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The influence of stiffness of implant-abutment connection on load-deflection ratios of a screw-retained stiff cantilever beam. 3-D measurements in vitro
- 2013
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Ingår i: Clinical Oral Implants Research. - : Wiley. - 0905-7161 .- 1600-0501. ; 24:11, s. 1251-1256
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Tidskriftsartikel (refereegranskat)abstract
- Aim: The purpose of this in vitro study was to investigate the influence of degree of stiffness of implant-abutment connection of a Brånemark implant system on load- deflection ratios in three dimensions of the beam-end of a screw-retained stiff cantilever beam when subjected to vertically directed loads.Material and methods: Two different implant-abutment connections were tested; welded and screw-retained. One of the abutments (EsthetiCone 2.0; Nobel Biocare AB) was screwed with a torque force of 20 N cm and then laser welded around its entire periphery to one of two Brånemark implants (welded unit). This unit and the other implant were tightly screwed into each of two pre-threaded holes in a steel plate so that the implants became submerged in the plate. The remaining abutment was thereafter screwed to its implant with a torque force of 20 N cm (screw-retained unit). A cantilevered gold beam of 6 mm height and width comprising a gold cylinder (Nobel Biocare AB) was attached to each abutment with a slotted, flat headed, prosthetic gold screw (torque force 10 N cm). A force transducer, synchronized with a 3-D motion analysis system, was glued on the upper surface of each beam-end 19.4 mm from the implant, to register the loads transferred from a specially built loading device. The beam-ends were stepwise subjected to vertically directed loads from 14.9 to 40.3 N and the vertical and horizontal deflections of the beam-ends were registered with the 3-D motion analysis system.Results: For load 14.9–40.3 N the vertical (z-axis) deflections of the beam-end were for the welded implant-abutment connection reduced with 18–46% compared with the screw-retained unit. After maximal loading (40.3 N) the horizontal counter-clockwise rotation of the beam around the screw joints (y-axis rotations) was reduced with 61% for the welded connection. The horizontal movements of the beam-end along the x-axis (x-axis deflections) were reduced with 49% at maximal loading.Conclusion: It was concluded that increased implant-abutment stiffness will substantially reduce both vertical and horizontal deflections of a screw-retained stiff cantilever beam subjected to vertically directed loads.
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| 6. |
- Cassel, Felix, 1992, et al.
(författare)
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All inclusive eller baspaket? Svenska folket tecknar ett samhällskontrakt
- 2024
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Ingår i: Inferno. - Göteborg : Göteborgs universitet. - 0284-4788. - 9789189673557 ; , s. 45-60
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Samhällskontraktet kan ses som ett implicit avtal som specificerar det ömsesidiga utbytet av förpliktelser mellan medborgare och stat. Detta begrepp har på senare år kommit att ta en allt större plats i samhällsdebatten. Debattörerna gör ofta gällande att samhällskontraktet är på väg att brytas. Frågan är emellertid vad samhällskontraktet egentligen består av och vad svenskarna anser om kontraktets giltighet? I det här kapitlet gör vi ett försök att besvara dessa frågor. Resultaten visar att det finns ett slags ”baskontrakt” som alla är mer eller mindre ense om. Det handlar om att följa lagar, rösta, betala skatt och att inte överutnyttja välfärdssystemet. Därutöver kan vi se att det finns tydliga ideologiska skiljelinjer gällande vilka krav som ställs på staten respektive medborgarna i ett utökat ”premiumkontrakt”. Likaså är födelseland av betydelse för kontraktets omfattning. Vi kan också konstatera att det finns en beredskap att göra uppoffringar för att få kontraktet att fungera.
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| 7. |
- Cassel, Kerstin, 1963-
(författare)
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Från grav till gård : romersk järnålder på Gotland
- 1998
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Houses with a stone foundation represent a new type of building on Gotland in the middle of the Roman Iron Age. At the same time there are other changes, for instance the number of visible graves decreases, and the farm and its land are emphasized by the stone enclosures that meander in the landscape. The purpose of this thesis is to examine how these changes in the source material can be understood in terms of changes in society and in people's way of looking at their world. Graves from the Roman Iron Age are studied in relation to their grave-goods, their appearance, and their connection to settlements and other graves. Objects of gold in the graves are compared with gold in deposits, and one can establish that different types of artefacts are found in different contexts. The settlements are also viewed at various levels, from the individual house and its artefacts to the structure of the cultural landscape. The hill-forts on Gotland are discussed and an overview of the Roman Iron Age in the rest of Scandinavia is given.The analysis of the graves reveals that the decrease in number in the middle of the Roman Iron Age can, at least in part, be explained by the a lack of a superstructure. At the same time precious artefacts such as Roman objects become more frequent, and so do the number of graves containing weapons. By studying the outline of the settlement pattern, one can conclude that the stone enclosures should not be interpreted merely as prehistoric fences, but that they should be recognized as a more complex phenomenon. In addition they link farms together into larger groups, and they connect the farmsteads to older graves. The interpretation that is put forward is that the stone enclosures, which link together farms and ancestors' graves, were an expression of how the society was organized around the family and kin. In this respect the stone enclosures "embodied" the social structure. In the analysis of the "forts", it is suggested that fortifications on flat ground belong to the period that precedes the changes in settlement, and that they constitute central places for the community. The forts on hilltops are on the other hand in many cases contemporaneous with houses with a stone foundation, and comparisons are made between hill-forts and stone enclosures.One interpretation that is put forward is that the maintenance of the social order in the local communities demanded new strategies, due to circumstances both on Gotland and in the surrounding world. Stone had a great part in this strategy, because it could preserve the farm and the enclosure-communities for the future. The stone enclosures linked the past graves to the present, and through the stones' permanence one built for the future. Some of the changes in the archaeological material can thus be interpreted as an attempt to prevent changes in the society.
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| 8. |
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| 9. |
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| 10. |
- Cassel, Sofia, et al.
(författare)
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A structured approach to training open-ended problem solving
- 2015
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Ingår i: Proc. 45th ASEE/IEEE Frontiers in Education Conference. - Piscataway, NJ : IEEE Press. - 9781479984534 ; , s. 417-420
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Konferensbidrag (refereegranskat)abstract
- Students in engineering are well trained in solving specified problems, but some have trouble when given problems where there is more than one solution. In their professional life they are much more often confronted with open-ended problems, where there may be more than one solution, and where there may be many ways to reach each one. The goals may be vague, the problem may be underspecified, and the fresh graduate frustrated by the new situation.We present a structured approach to training students in open-ended problem solving. We have introduced a half-day workshop to help students learn to work with open-ended, ill-structured problems, using a different approach than they would for the well-structured problems they are used to.Our results indicate that students have become more creative. Compared to previous years, the students explore more paths towards the goal, and use more elaborate methods. Their approach is similar to that typically used by the best students in previous instances of the course. Students mention creativity and group dynamics as positive aspects of the workshop and the following lab.We conclude that with proper guidance and training, even weaker students can become more creative when solving open-ended problems.
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| 11. |
- Cassel, Sofia, et al.
(författare)
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Enhanced learning by promoting engineering competencies
- 2014
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Ingår i: Proc. 44th ASEE/IEEE Frontiers in Education Conference. - Piscataway, NJ : IEEE Press. - 9781479939213 ; , s. 2044-2049
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Konferensbidrag (refereegranskat)abstract
- An engineering graduate needs to master a number of important skills: problem solving, critical thinking, communication, collaboration, etc. In this paper we describe how a course in computer security, taught in the Computer and Information Engineering programme at Uppsala University, has been developed over a period of three years. The aim is to better develop the engineering competencies of students, improving their understanding of course contents, training their ability to reflect on it, and to apply their knowledge when facing realistic problems.The course is designed to activate students, based on practical labs and theoretical tasks which are solved in groups. The student reports are assessed at seminars, where the solutions are presented orally, peer-reviewed and discussed. The seminars encourage and reward activities at the higher levels of taxonomies such as Bloom's.The results of the development, based on a CEQ-based course evaluation, indicate that students take a deeper approach to learning. They develop their problem-solving skills to a high degree, appreciate the practical solving of open-ended problems, and take responsibility for collaborative learning. Their overall satisfaction with the course is quite high, despite indications that they find the workload high.
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| 12. |
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| 13. |
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| 14. |
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| 15. |
- Feldt, Björn, 1951-
(författare)
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Synliga och osynliga gränser : Förändringar i gravritualen under yngre bronsålder - förromersk järnålder i Södermanland
- 2005
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The burial ritual in Södermanland during Late Bronze Age–Pre Roman Iron Age is characterized by change. Although seldom, cairns – the most characteristic grave form of the Bronze Age – are erected also in the Iron Age, but the grave tradition is above all dominated by an increasing number of grave fields. The aim in this dissertation is to illustrate the changes in, and to look for the meaning of the new grave ritual, why the cairn ritual has been abandoned and grave fields are designed instead.In archive studies, above all at the ATA, Riksantikvarieämbetet in Stockholm, graves and grave fields from the period Late Bronze Age–Pre Roman Iron Age have been identified. Out of 781 excavated and documented graves from the period, changes and structures of the grave fields in Södermanland have been studied. The work is guided by the conception that documented changes in the grave ritual during the period has not occurred as a separated and isolated phenomenon. On the contrary, these changes have occurred in co-operation with social and economical structure transformations in a wider sense. The aim has been to show how the grave ritual has been part of the reconstruction of society during the studied period. The main question, which has been overshadowing the work, is of course the reason for these changes.The main hypothesis emanates from the fact that the proportionately small grave fields (but not all) have been expressions of smaller autonomic social organisations, i.e. the size of a farmyard. The new grave ritual has reproduced an image of the world, where stone settings and grave fields have served as a form of visible boundaries towards the closest surroundings. In the text arguments are tested to show if motives to these changes are to be found in social and ideological circumstances. A displacement of social relations might have occurred, where collective and public positions have gradually been abandoned. Instead a more private and socially segregated approach could have developed, characterised by more limited, strict and introverted attitudes. Has the matter of private property received a meaning so important that social structures have been affected? Is it possible that possessing itself has come to be of such crucial importance, that only the closest and selectively delimited social relations have been prioritized?
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| 16. |
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| 17. |
- Gustafsson Gillbrand, Patrik
(författare)
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Stenbruk : Stenartefakter, råmaterial och mobilitet i östra Mellansverige under tidig- och mellanmesolitikum
- 2018
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis examines artefacts, raw materials and lithic technology between c. 9200–6200 cal BC in Eastern Central Sweden. The overall purpose of this study is to investigate when people first came to Eastern Central Sweden and where they came from. More precisely, it provides a typological, geographical and chronological survey of artefacts and the use of different raw materials. The study deals with assemblages with artefacts from more than thirty archaeologically excavated sites and loose finds in Eastern Central Sweden. The objects consist of chubby pecked axes, core axes, flake axes, shaft hole picks, microliths and micro burins, points, burins, rulers, unifacial blade core, conical cores, micro blade cores, blades, drills, retouched blades and micro blades. The artefacts have been compared with established typologies and chronologies for the rest of the Nordic countries and to some extent Russia and the Baltic States. An analysis of different raw materials present at Early and Middle Mesolithic sites in Eastern Central Sweden was also carried out. The materials are put into a chronological and geographical context. The raw materials included in the study are the non-local rocks flint and Cambrian flint, as well as local raw materials such as quartz, greenstone, local vulcanite, mylonite and red porphyry. From 9200 cal BC there is evidence of the first groups of people in the area, just shortly after that the Weichselian ice cap had withdrawn. Throughout the period studied the artefacts as well as the non-local raw materials exhibit great similarities to those found in the western part of Sweden. The study also shows, regarding the use of different raw materials and presence of certain artefacts, that some major events took place, suggesting a new chronological time frame for the Early- and Middle Mesolithic periods. In addition, a discussion regarding mobility and migration in Eastern Central Sweden during Early Post Glacial time is carried out.
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| 18. |
- Henriksson, Mikael
(författare)
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Arkeologiska förväntningar i mötet med ett landskap : Stenålderns Blekinge ur ett kunskapsperspektiv
- 2019
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This study is about archaeological knowledge production. It is also about what kind of impact such knowledge may have on an antiquarian/archaeological practice as well as on society as a whole. The work focuses broadly on Stone Age archaeology and specifically on the middle-Mesolithic Age in the county of Blekinge in the South East of Sweden.Until the late 1990’s, large-scale archaeological excavations in this region were rare. In particular, there were significant gaps in early- and middle-Mesolithic archaeology of other regions. In particular, the study brings up the relationship with the defined Kongemose culture's settlements in Southern Scandinavia. From a knowledge perspective the study discusses how different kinds of methodological practices are important for both archaeology and society, to be able to see and understand a more complete historical picture. Based on this, the focus shifts the role of museums within regional archaeology. The study here argues for a more strategically executed dissemination and presentation of archaeological knowledge towards different stakeholders.
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| 19. |
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| 20. |
- Stefanini, M., et al.
(författare)
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Patient-reported outcomes and aesthetic evaluation of root coverage procedures: a 12-month follow-up of a randomized controlled clinical trial
- 2016
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Ingår i: Journal of Clinical Periodontology. - : Wiley. - 0303-6979. ; 43:12, s. 1132-1141
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Tidskriftsartikel (refereegranskat)abstract
- Aim: To assess patient-reported outcome measures (PROMs), aesthetics and stability of root coverage procedures from a previous 6-month RCT after 1year. Material & Methods: Forty-five patients (90 recessions) had received a coronally advanced flap (CAF=control) only or a xenogeneic collagen matrix in addition (CAF+CMX=test). Visual analogue scales (VAS) and questionnaires were used for PROMs and the root coverage aesthetic score (RES) for professional aesthetic evaluations. Results: VAS scores (patient satisfaction) amounted to 8.58±1.86 (test) versus 8.38±2.46 (control). Six patients preferred CAF+CMX concerning surgical procedure and aesthetics, six preferred CAF and 29 were equally satisfied. RES was 7.85±2.42 for the test group versus 7.34±2.90 for the controls. Root coverage (RC) was 76.28% for test and 75.05% for control defects. The mean increase in keratinized tissue width was higher in test (from 1.97 to 3.02mm) than in controls (from 2.00 to 2.64 mm) (p=0.0413). Likewise, test sites showed more gain in gingival thickness (0.52mm) than control sites (0.27mm) (p=0.0023). Compared to 6months, clinical outcomes were stable. Conclusions: Results for PROMs, RES and RC did not significantly differ between treatment groups. Thickness and width of keratinized tissue were enhanced following CAF+CMX compared to CAF alone. © 2016 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
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