| 1. |
- Bäckstrand, Jenny, 1979-, et al.
(författare)
-
A method for customer-driven purchasing
- 2013
-
Ingår i: Operations Management at the Heart of the Recovery. - : International Annual EurOMA Conference.
-
Konferensbidrag (refereegranskat)
|
|
| 2. |
|
|
| 3. |
- Esmaily, Mohsen, 1987, et al.
(författare)
-
A new semi-solid casting technique for fabricating SiC-reinforced Mg alloys matrix composites
- 2016
-
Ingår i: Composites Part B: Engineering. - : Elsevier BV. - 1359-8368 .- 1879-1069. ; 94, s. 176-189
-
Tidskriftsartikel (refereegranskat)abstract
- The capability of the newly developed rheocasting (RC) technique in combination with the RheoMetal process for producing SiC particulate-reinforced AM50 and AZ91D matrix composites (Mg-based MMCs) was investigated. The quality of the MMCs was studied by analyzing the fraction of casting pores, number density of SiC clusters and the uniformity of SiC particles. Solid fraction, particle size and oxidation of SiC particles had strong impacts on the overall quality of the MMCs. The MMCs produced by 40% solid fraction and oxidized micron-sized SiC particles exhibited an excellent casting quality. A low-quality MMC was obtained when non-oxidized sub-micron sized SiC particles were employed. The results showed the formation of various types intermetallic particles and carbides such as MgO, Mg2Si, Al2MgC2, Mg2C3, Al4C3 as the interfacial reaction products of SiC/Mg alloy's melts. Mg hydride (alpha-MgH2) was also identified in inter-dendritic regions of the MMCs for the first time.
|
|
| 4. |
- Esmaily, Mohsen, 1987, et al.
(författare)
-
Atmospheric Corrosion of Mg Alloy AZ91D Fabricated by aSemi-Solid Casting Technique: The Influence of Microstructure
- 2015
-
Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 0013-4651 .- 1945-7111. ; 162:7, s. C311-C321
-
Tidskriftsartikel (refereegranskat)abstract
- The atmospheric corrosion behavior of alloy AZ91D produced by a semi-solid metal (SSM) technique and by conventional high pressure die casting (HPDC) was investigated for up to 1176 hours in the laboratory. Alloy AZ91D in the SSM state was fabricated using a rheocasting (RC) technique in which the slurry was prepared by the RheoMetal process. Exposures were performed in 95% RH air at 22 and 4 degrees C. The RC alloy AZ91D exhibited significantly better corrosion resistance than the HPDC material at two temperatures studied. The effect of casting technology on corrosion is explained in terms of the microstructural differences between the materials. For example, the larger number density of cathodic beta phase particles in the HPDC material initially causes relatively rapid corrosion compared to the RC material. During later stages of corrosion, the more network-like beta phase particles in the RC alloy act as a corrosion barrier, further improving the relative corrosion resistance of the RC material.
|
|
| 5. |
- Esmaily, Mohsen, 1987, et al.
(författare)
-
Effect of Rheocasting on Corrosion of AM50 Mg Alloy
- 2015
-
Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 0013-4651 .- 1945-7111. ; 162:3, s. C85-C95
-
Tidskriftsartikel (refereegranskat)abstract
- The corrosion behavior of magnesium-aluminum (Mg-Al) alloy AM50 produced by a rheocasting (RC) technique was examined in the presence and absence of CO2 at three temperatures -4, 4 and 22 degrees C. The slurry preparation in the RC material was performed with the newly developed RheoMetal process. For reference, 99.97% Mg was included in the corrosion exposures. The influence of the microstructure on the atmospheric corrosion of alloy AM50 produced by RC and high pressure die casting (HPDC) was investigated. The RC AM50 alloy showed better corrosion resistance than HPDC AM50 in all the exposure environments studied. For both materials, there was a strong positive correlation between temperature and the atmospheric corrosion rate. The superior atmospheric corrosion behavior of RC AM50 compared to HPDC AM50 is carefully discussed in relation to differences in the as-cast microstructure. This study demonstrates that producing the alloy AM50 by this type of RC technique opens the door to Mg-Al alloys as a promising candidate for various applications where corrosion resistance is of importance.
|
|
| 6. |
- Esmaily, Mohsen, 1987, et al.
(författare)
-
Microstructural characterization of the Mg-Al alloy AM50 produced by a newly developed rheo-casting process
- 2014
-
Ingår i: Materials Characterization. - : Elsevier BV. - 1044-5803 .- 1873-4189. ; 95, s. 50-64
-
Tidskriftsartikel (refereegranskat)abstract
- The microstructure of rheo-cast Mg-Al alloy AM50 produced by the RheoMetal process is investigated and compared with the same alloy produced by conventional high pressure die casting. The size and arrangement of microstructural constituents and pores are characterized quantitatively using image analyzing techniques. The nearest neighbor distribution of the intermetallic particles is determined. The area fraction of porosity in rheo-cast AM50 is about half that found in the high pressure die cast alloy. In rheo-cast material, the distribution of p phase (Mg17Al12) is relatively uniform throughout the cast. In contrast, the beta phase particles tend to form macroscopic agglomerates in high pressure die cast material. The externally solidified grains in the rheo-cast material exhibit a smaller aluminum gradient than in the high pressure die cast alloy. This indicates that the solidification of the rheo-cast material is closer to equilibrium.
|
|
| 7. |
- Esmaily, Mohsen, 1987, et al.
(författare)
-
On the microstructure and corrosion behavior of AZ91/SiC composites produced by rheocasting
- 2016
-
Ingår i: Materials Chemistry and Physics. - : Elsevier BV. - 0254-0584 .- 1879-3312. ; 180, s. 29-37
-
Tidskriftsartikel (refereegranskat)abstract
- The microstructure and atmospheric corrosion behavior of two types of SiC (10 vol%)-reinforced magnesium alloy metal matrix composites (Mg alloy AZ91D-based MMCs) produced by rheocasting (RC) were investigated and compared to the monolithic alloy. Micron-sized and nano-sized SiC particles were used for fabrication of the MMCs. Microstructural studies using a broad range of analytical techniques showed the formation Al carbides and MgO at the alpha-Mg/SiC interface. The higher corrosion rate of the MMCs than RC AZ91D was attributed to a lesser degree of connectivity of the beta phase, the high impurity level of SiC-reinforced MMCs and also the higher fraction of casting pores in the MMCs as compared to the RC alloy.
|
|
| 8. |
- Jansson, Henrik, et al.
(författare)
-
Impact of periodontal disease experience on oral health-related quality of life
- 2014
-
Ingår i: Journal of Periodontology. - : John Wiley & Sons. - 0022-3492 .- 1943-3670. ; 85:3, s. 438-445
-
Tidskriftsartikel (refereegranskat)abstract
- Background: Periodontal research has traditionally focused on the site level, regarding etiology, pathogenesis, and treatment outcome. Recently, some studies have indicated that the presence of periodontal disease is associated with reduced quality of life. The aim of this study is to investigate the impact of periodontal disease experience on the quality of life.Methods: This cross-sectional study includes 443 individuals. Clinical and radiographic examinations were performed; in conjunction, the oral health-related quality of life of all participants was assessed using the Swedish short-form version of the Oral Health Impact Profile (OHIP-14). Based on marginal bone loss, measured on radiographs, three different groups were identified: participants with loss of supporting bone tissue of less than one third of the root length (BL-), loss of supporting bone tissue of one third or more of the root length in <30% of teeth (BL), or loss of supporting bone tissue of one third or more of the root length in 30% of teeth (BL+).Results: The effect of periodontal disease experience on quality of life was considerable. For the BL- group, the mean OHIP-14 score was 3.91 (SD: 5.39). The corresponding mean values were 3.81 (SD: 5.29) for the BL group and 8.47 (SD: 10.38) for the BL+ group. The difference among all groups was statistically significant (P 0.001). A comparison among the mean OHIP-14 scores in the different groups (BL-, BL, and BL+) revealed significant differences in six of seven conceptual domains.Conclusions: The BL+ individuals experienced reduced quality of life, expressed as the OHIP-14 score, compared with the BL and BL- participants.
|
|
| 9. |
- Johansson, Anette
(författare)
-
Ways forward : Effectual and causal approaches to innovation in the Swedish magazine industry
- 2014
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This dissertation builds on a study of key decision makers in the Swedish magazine publishing industry with a particular focus on how they think and act in their work to innovate their industry. This industry, much like the rest of the media industry, is facing increased unpredictability regarding for example the impact of new technology on the business and future demand. Traditional planning (causal) approaches can be greatly questioned in times of uncertainty, when the task at hand include creating products and services that do not yet exist.In this study I examine an alternative logic forward which takes its starting point in the interests, experiences, knowledge and networks of decision makers – instead of given goals. This logic is known as an effectual logic, and offers an alternative approach to move forward with innovation work. I argue, that the effectual logic can enable organizations to capitalize better from people’s experiences, networks and “gut-feeling” and create the innovations we now know nothing about. The effectual process involves developing ideas that coevolve together with others who want to commit, in a spirit that welcomes surprise, flexibility and experimentation. In this process products and services are created which could not have been predicted and planned – innovations. This logic of entrepreneurial action stems from research on expert entrepreneurs, however limited research has been done on its use and relevance in an established firm context. In this dissertation I examine this in the setting of magazine publishing firms to better understand the underlying mechanisms of effectuation in the firm setting, and its consequences for learning, innovation and performance. Alongside the effectual logic, I examine the traditional, causal logic dominating management education and practice.Effectuation is generally used among the decision makers in the study, inparticular among the most senior managers. Effectuation is positively linked to innovation, in particular radical innovation, and a combination of both logics is positively linked to innovation in general. Combining causal and effectual logics also gives rise to more knowledge useful for future innovation projects. One challenge for organizations is how to transfer this logic from the most senior managers to the whole organization, and thus make the most of the experiences and networks of their members.
|
|
| 10. |
|
|
