| 1. |
- Karlkvist, Tommy, et al.
(författare)
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Molecular recognition in mineral flotation : Selectivity in apatite-calcite system
- 2014
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Ingår i: 27th International Mineral Processing Congress, IMPC 2014, Santiago, Chile, 20-24 October 2014.
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Konferensbidrag (refereegranskat)abstract
- The present investigation aims to develop and distinguish mineral specific reagents with two functional groups for use in flotation of calcium containing minerals. For this purpose, a series of dicarboxylate-based surfactants with varying length between the carboxylate groups (one, two or three methylene groups) were synthesized. As reference, a surfactant with the same alkyl chain length but with only one carboxylate group in the polar part was synthesized. The adsorption behavior of these new reagents on pure apatite and calcite mineral surfaces was studied using Hallimond tube flotation, FTIR and ζ potential measurements. The relation between the adsorption behavior of a given surfactant on a specific mineral surface and its molecular structure over a range of concentration and pH values, as well as the region of maximum recovery were established. It was found that one of the reagents, with a specific distance between the carboxylate groups, was much more selective for a particular mineral surface than the other homologues synthesized. This selective adsorption of a given surfactant to a particular mineral surface relative to other mineral surfaces as evidenced in flotation studies is substantiated by ζ potential and infra-red spectroscopy data.
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| 2. |
- Patra, Anuttam, et al.
(författare)
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Design and development of novel mineral-specific collectors for flotation
- 2014
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Ingår i: 27th International Mineral Processing Congress, IMPC 2014, Santiago, Chile, 20-24 October 2014.
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Konferensbidrag (refereegranskat)abstract
- Almost all of the flotation reagents used today were discovered by continued application of empirical methods and/or trial and error experimentation. Moreover, with the metal-ion specific approach used so far, it is difficult to separate the minerals containing the same constituent metal ion. A critical assessment of molecular recognition processes involved in biomineralization suggested the possibility of using reagents which are surface specific. The concept that the molecules consisting of two or more functional groups having appropriate spacing between those so as to achieve structural/stereochemical compatibility during interaction with the mineral surface exhibit structure-specificity is thought to be extended to the design of specific collectors in flotation processes. In the present study, for the first time, a rational design of surface active molecules, and thereby the recognition of crystal faces (of minerals) by these molecules through structural and stereochemical matching is being utilized successfully to selectively float various minerals. For this purpose, carboxylate-based collectors (for mineral specific flotation of calcium minerals) as well as xanthate-based collectors (for mineral specific flotation of sulphide minerals) with a fixed alkyl chain length but having two functional groups with varying geometrical distances (separated by a spacer of one, two and three carbon atoms) between them have been synthesized. In this article, we have discussed the design, synthesis, purification of these novel mineral specific collectors as well as their important solution parameters in relation to flotation processes.
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| 3. |
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| 4. |
- Amani, Pegah, 1983, et al.
(författare)
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Food product clustering for customized food logistics
- 2013
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Ingår i: 7th International European Forum (Igls-Forum) - (136th EAAE Seminar) on System Dynamics and Innovation in Food Networks , Innsbruck-Igls, Austria.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Anna, Malm, 1978, et al.
(författare)
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Production start-up phase - A comparison between New Product Development and Production Relocation
- 2012
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Ingår i: Proceedings of the 5th International Swedish Production Symposium. - 9789175197524 ; , s. 593-598
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Konferensbidrag (refereegranskat)abstract
- New product development in a globalized industrial environment with a constant increasing competition, challenges the ways to perform production start-up and production relocation. A product development process focuses in general on product function and to avoid product quality problems. A production relocation focus also on avoiding product quality problems, but relocation is mostly related to forgotten or misunderstood information. The challenging situation due to a more global market is the increasing need for production relocation. In this paper, a literature review is performed investigating these three areas and relate them with industrial experience from production relocations. To summaries, the existing processes in industry today seem to be based on processes for product development. The results view that effectiveness in production relocation are dependent on technology and knowledge transfer and the production start-up process.
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| 6. |
- Edh, Nina, 1984, et al.
(författare)
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Strategic Consensus in SMEs: Behavioral Operations Perspective on Manufacturing Strategy
- 2013
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Ingår i: Proceedings for the 22nd International Conference on Production Research, Challenges for Sustainable Operations, July 28th - Aug 1, 2013, Parana, Brazil.
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Konferensbidrag (refereegranskat)abstract
- Previous manufacturing strategy (MS) studies have to a limited extent incorporated the people dimension emphasized in the behavioral operations field. This paper aims to empirically examine the relationship between managers’ and operators’ perceptions of MS from a behavioral operations perspective. Interviews with both managers and operators at three Swedish metalworking small and medium enterprises (SMEs) were conducted. The results show a higher level of strategic consensus, compared to earlier research. Strategic consensus is primarily seen within the intra-organizational dimensions. Lack of consensus seems to be caused primarily by poor communication about strategic objectives and long-term plans. By emphasizing the people dimension of MS, this paper contributes to increased knowledge about strategic consensus at SMEs and the importance of strategic commitment and strategic consensus for a successful MS process.
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| 7. |
- Edh, Nina, 1984, et al.
(författare)
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The people dimension in manufacturing strategy: contextual factors influencing a joint view
- 2014
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Ingår i: Proceedings for the 21th International Annual EurOMA Conference | Operations Management in an Innovation Economy | 20-25 June 2014, Palermo, Italy. - : International Annual EurOMA Conference.
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Konferensbidrag (refereegranskat)abstract
- This paper explicates the contextual factors influencing the workers’ perceptions of theMS, and hence, the possibilities for a joint view between workers and managers. Thepaper is based on in depth interviews with 16 workers in four metal working SMEs inSweden. The contextual factors can be viewed at two levels: individual andorganisational. This paper contributes to richer descriptions of what the individual andorganisational contextual factors incorporate, and to the clarification of the importantrole communication channels plays for the possibilities of a joint view. Thereby,contributing to increased knowledge on the manufacturing strategy formation process.
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| 8. |
- Fredriksson, Anna M K, 1979, et al.
(författare)
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Assuring materials availability during the production transfer process – Critical characteristics of the materials planning environment
- 2014
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Ingår i: Journal of Manufacturing Technology Management. - 1741-038X. ; 25:3, s. 310-333
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The MP (materials planning) environment sets the prerequisites for the MP process. Before and during PTS (production transfer and start-up) supply chain uncertainty of the MP environment increases, as the company goes from a known to an unknown situation. The purpose of this paper is to describe the impact of the MP environment on the MP process before and during PTS.Design/methodology/approach: A conceptual framework describing the MP environment before and during PTS is developed and applied to one case of outsourcing from Sweden to China. The framework is based on a literature review and further evaluated by both researchers and managers.Findings: A conceptual framework describing the dynamic MP environment before and during PTS has been developed compared to previously static MP environments descriptions. In addition, this framework proved to be useful in analysing the importance of various characteristics of the MP environment before and during PTS.Practical implications: The study highlights the importance of a proactive approach to materials availability when transferring production. The conceptual framework developed here can be used as a checklist to identify the characteristics of the MP environment that are most important to ensuring materials availability.Originality/value: The paper highlights the PTS when outsourcing, a substantial time frame with a large impact on success. This is an important contribution, given the focus of previous outsourcing research on strategic issues. Further, the paper demonstrates the differences between static and dynamic MP environments.
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| 9. |
- Fredriksson, Anna M K, 1979, et al.
(författare)
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Materials planning activities during production transfer and start-up
- 2012
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Ingår i: Proceedings of the 19th International EurOMA Conference, Amsterdam, July 2012.
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Konferensbidrag (refereegranskat)abstract
- Outsourcing is realised through production transfer. The implementation of a transfer, until the new supply chain reaches steady state, is here denoted ‘production transfer and start-up’ (PTS). The objective is to explore what materials planning (MP) activities are required before and during PTS, in order to ensure materials availability. By linking technology and knowledge transfer and production start-up to production transfers the paper explores how PTS affects materials availability. A multiple case study approach was used. The study shows that there are MP activities specific for PTS, of some are MP activities to handle unexpected events during start-up.
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| 10. |
- Fredriksson, Anna M K, 1979
(författare)
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Materials Supply and Production Outsourcing
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Supplier and customer markets have become more global and have forced companies to consider restructuring their supply chains to take advantage of opportunities in terms of costs, competence, etc. at different locations. One way to take advantage of opportunities in other locations is to outsource parts of the production to suppliers. Production outsourcing implies change from in-house material supply to purchasing materials from a supplier; therefore, production outsourcing can affect material supply in terms of delivery reliability, lead times, and product quality. The focus of this thesis is how the production outsourcing transition from making to buying a product affects material supply. The overall purpose of the thesis is to understand how to ensure reliable and efficient material supply during the whole outsourcing process. With the whole outsourcing process is included from before physical transfer where the decision to outsource is made until a steady state is reached with a continuous supply from the new source. The thesis is answering three research questions using the results of six appended papers. The six papers are based on five studies, i.e., two single case studies, two multiple case studies, and one simulation study. Empirical data in the case studies were mainly collected through interviews with staff working in the outsourcing companies. The first research question identifies what logistics considerations are necessary for each of the phases of a general outsourcing process, in order to accomplish a well functioning supply chain during production transfer and start-up and steady state after physical transfer. The second research question provides a framework for the evaluation of the consequences of outsourcing and the impact on tied-up capital, product quality, customer service, and delivery flexibility of sourcing from a specific supplier. Further, the simulation study showed that supply chain performance can be improved through how the different parts of the supply chain are utilised, which can be accomplished through a sourcing strategy of sourcing stable demand globally and handle uncertainty locally. The third research question describes the material planning environment during production transfer and start-up and shows how the choice and application of the material planning process during production transfer and start-up affects supply chain performance. In the discussion, the results from the research questions were combined and a framework how to ensure material supply during the whole outsourcing process was outlined. The thesis contribute to the material supply research area by identifying how existing processes and methods within the material supply area must be adapted to fit the specific conditions of outsourcing. Contributions to the outsourcing research area are made by showing that to ensure materials supply, the whole outsourcing process has to be in focus i.e., from before physical transfer where the decision to outsource is made until a steady state is reached with a continuous supply from the new source.
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