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He, Mingzhao
Publications (10 of 12) Show all publications
He, M. & Forssberg, E. (2007). Influence of slurry rheology on stirred media milling of quartzite (ed.). Paper presented at . International Journal of Mineral Processing, 84(1-4), 240-251
Open this publication in new window or tab >>Influence of slurry rheology on stirred media milling of quartzite
2007 (English)In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 84, no 1-4, p. 240-251Article in journal (Refereed) Published
Abstract [en]

The role of slurry rheology in stirred media milling of quartzite has been investigated by varying important grinding parameters such as media bead density and size, addition of chemicals, solids concentration, stirrer rotational speed as well as the combined effect of these factors. Media bead density has an evident but complex effect on stirred milling performance, depending on stirrer rotational speed and solids concentration. The effect of media bead size on the ultra-fine grinding of quartzite is relevant to the feed size. Optimal ratio of media bead size to the median size of a feed is between 150 and 200. The combined effect of grinding bead size and stirrer speed or solids concentration is insignificant. The addition of Dispersant S40 or a lower solids concentration results in better grinding performance (i.e., a higher energy efficiency and a smaller median size) due to the maintenance of lower viscosities at shear rates investigated during grinding. Stirrer rotational speed interacts with solids concentration. For a given solids concentration, an optimal stirrer speed exists. The observed phenomena can be explained by the interaction of slurry rheology and the stress intensity of individual grinding bead. In addition, an empirical particle size-energy model provides a good fit (R2 > 0.904) to the grinding results under the experimental conditions investigated. Furthermore, the wear of grinding media beads is involved. ZrO2 beads have a lowest wear rate whereas the wear of SiO2 beads is most serious. The wear rate of Al2O3 beads is related to bead size.

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-13056 (URN)10.1016/j.minpro.2006.08.001 (DOI)000250160200024 ()2-s2.0-34548483935 (Scopus ID)c36e0170-b06a-11db-840a-000ea68e967b (Local ID)c36e0170-b06a-11db-840a-000ea68e967b (Archive number)c36e0170-b06a-11db-840a-000ea68e967b (OAI)
Note
Validerad; 2007; 20070130 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
He, M. & Forssberg, E. (2007). Rheological behaviors in wet ultrafine grinding of limestone (ed.). Paper presented at . Minerals & metallurgical processing, 24(1), 19-29
Open this publication in new window or tab >>Rheological behaviors in wet ultrafine grinding of limestone
2007 (English)In: Minerals & metallurgical processing, ISSN 0747-9182, Vol. 24, no 1, p. 19-29Article in journal (Refereed) Published
Abstract [en]

This paper investigates the effects of solids concentration and the addition of Dispersant S40 on the flowability of original and ground limestone slurries. A rotational viscometer with a concentric cylinder geometry and a controlled-stress rheometer with a cone-and-plate geometry were used to characterize the rheological behaviors of limestone slurries. The rheological behavior of original limestone slurries ( < 100 gm) is transformed through different types of flows with increasing solids concentration. The use of Dispersant S40 can improve the slurry flowability by decreasing viscosity and eliminating Casson yield stress. It is therefore used as a grinding aid for the wet ultrafine grinding of limestone. The rheological behaviors of ground limestone slurries vary with grinding from a starting dilatant flow-ability to a resulting pseudoplastic one with an evident Casson yield stress in combination with a thixotropic character. The appearance of pseudoplastic flowability combining thixotropy is related to the fineness of a ground product and its specific surface area, which are both correlated to solids concentration and the additive amount of Dispersant S40. In addition, the accurate rheological characterization of time-dependent fluids is dependent on the instruments used and operation conditions.

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-16347 (URN)ff843eb0-6b43-11dc-9e58-000ea68e967b (Local ID)ff843eb0-6b43-11dc-9e58-000ea68e967b (Archive number)ff843eb0-6b43-11dc-9e58-000ea68e967b (OAI)
Note
Validerad; 2007; 20070925 (pirkko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
He, M. (2007). Slurry rheology of industrial minerals and its effects on wet ultra-fine grinding (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Slurry rheology of industrial minerals and its effects on wet ultra-fine grinding
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates slurry rheology of industrial minerals (limestone and quartzite) and its effects on wet ultra-fine grinding in order to reduce energy cost, increase the throughput as well as the product fineness. The influences of solid concentration, molecular weight of a dispersant, and particle size and distribution on the rheological behaviour of original limestone slurries have been investigated. The results reveal that when the solid concentration of a limestone slurry (< 100 ¦Ìm) is increased from 60 wt.% (35.71 vol.%) to 78.5 wt.% (57.49 vol.%), the rheological behaviour of the slurry is transformed from a weakly dilatant or Newtonian characteristic to a pseudoplastic one with a yield stress, which is in combination with a thixotropic property at a higher solid concentration (i.e., ¡Ý 75 wt.% or 52.63 vol.%). At a certain shear rate, the apparent viscosity and the relative viscosity of the slurry both increase exponentially with solid concentration. The extrapolated Casson yield stress increases in a power-law form with increasing solid concentration when the solid concentration is larger than 70 wt.% (i.e., 46.36 vol.%). The maximum attainable packing solid fraction ( m) is predicted as 64.6 vol.% at the limestone-water suspension. A polymeric dispersant named Dispersant S40 with a molecular weight of 5,500 Da appears most efficient for the reduction of the apparent viscosity of limestone slurry. The smaller the particle size and the narrower the size distribution, the more evident the pseudoplastic behaviour of limestone slurry is with a higher yield stress and a larger apparent viscosity at a given shear rate in the range 12 - 1200 s-1. However, a sufficient addition dosage of Dispersant S40 significantly decreases or even eliminates the rheological differences of limestone slurries (apparent viscosity and extrapolated yield stress) resulting from differences in particle size and distribution. Wet ultra-fine grinding of a limestone material (< 100 ¦Ìm) has been investigated in a stirred media mill with respect to the effect of slurry rheology. The results obtained by varying operation parameters (i.e., molecular weight of a dispersant, solid concentration, addition dosage, addition method and bead load) are evaluated in terms of energy efficiency and the fineness. Dispersant S40 gives the superior results compared to the other dispersants (i.e., BCX-476 and BCX-552). For a certain level of bead load, an optimal solid concentration exists for more effective grinding. At 0.1 wt. % of addition dosage of Dispersant S40 or more (¡Ü 0.6 wt.%), a smaller addition amount of Dispersant S40 leads to a higher energy efficiency and a smaller median size at a lower level of specific energy input. However, the excessive amount of the dispersant causes the grinding less efficient. This can be avoided by either the multi-point addition of the dispersant or a higher bead load (¡Ý 83 vol. %). The role of slurry rheology in stirred media milling of quartzite has also been performed by varying important grinding parameters such as media bead density, addition of chemicals, solid concentration, stirrer rotational speed as well as the combined effect of these factors. Media bead density has an evident but complex effect on stirred milling performance, depending on stirrer rotational speed and solid concentration. Addition of Dispersant S40 or a lower solid concentration results in better grinding performance (i.e., a higher energy efficiency and a smaller median size) due to maintenance of lower viscosities at shear rates investigated during grinding. Stirrer rotational speed interacts with solid concentration. For a given solid concentration, an optimal stirrer speed exists. The observed phenomena can be explained by the effect of slurry rheology on the stress intensity of individual grinding bead. The flowability of ground limestone slurries during grinding has been monitored and characterized. The rheological behaviour of ground limestone slurries varies with grinding from a starting dilatant flowability to a resultant pseudoplastic one with an evident Casson yield stress in combination with a thixotropic character. The appearance of pseudoplastic flowability with a thixotropy is related to the fineness of a ground product and its specific surface area, which are both correlated to solid concentration and the addition amount of Dispersant S40. However, the rheological characterization of time-dependent fluids is dependent upon the instruments used and operating conditions. In addition, an empirical particle size-energy model provides a good fit to the wet ultra-fine grinding results for both limestone and quartzite under the experimental conditions investigated.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2007. p. 68
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2007:44
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-25983 (URN)c04ca9a0-9c3d-11dc-97ff-000ea68e967b (Local ID)c04ca9a0-9c3d-11dc-97ff-000ea68e967b (Archive number)c04ca9a0-9c3d-11dc-97ff-000ea68e967b (OAI)
Note
Godkänd; 2007; 20071126 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-24Bibliographically approved
He, M. & Forssberg, E. (2006). Influence of slurry rheology on stirred media milling of limestone (ed.). In: (Ed.), S. Komar Kawatra (Ed.), Advances in Comminution: [third international symposium, 2006]. Paper presented at International Symposium: Advances in Comminution : 26/03/2006 - 29/03/2006 (pp. 243-260). Littleton, Colo: Society for Mining, Metalurgy and Exploration
Open this publication in new window or tab >>Influence of slurry rheology on stirred media milling of limestone
2006 (English)In: Advances in Comminution: [third international symposium, 2006] / [ed] S. Komar Kawatra, Littleton, Colo: Society for Mining, Metalurgy and Exploration, 2006, p. 243-260Conference paper, Published paper (Other academic)
Abstract [en]

This paper reviews the influences of solids concentrations and dispersants with a range of molecular weights on the flowability of limestone slurries as well as the effects on wet ultrafine grinding in order to reduce energy cost and increase the fineness of a product. Sodium pofyacrylate with a molecular weight of 5,500 (i.e., Dispersant S40) appears most effective for the grinding due to the effective reduction of apparent viscosities and the maintenance of steady flowability. Optimal solids concentration exists at a certain beads load for the effective wet ultrafine grinding of limestone, and a rheological explanation is presented.

Place, publisher, year, edition, pages
Littleton, Colo: Society for Mining, Metalurgy and Exploration, 2006
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-38947 (URN)d8292170-b845-11db-abff-000ea68e967b (Local ID)0-87335-246-7 (ISBN)d8292170-b845-11db-abff-000ea68e967b (Archive number)d8292170-b845-11db-abff-000ea68e967b (OAI)
Conference
International Symposium: Advances in Comminution : 26/03/2006 - 29/03/2006
Note
Godkänd; 2006; 20070209 (pafi)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
He, M., Wang, Y. & Forssberg, E. (2006). Parameter effects on wet ultrafine grinding of limestone through slurry rheology in a stirred media mill (ed.). Paper presented at . Powder Technology, 161(1), 10-21
Open this publication in new window or tab >>Parameter effects on wet ultrafine grinding of limestone through slurry rheology in a stirred media mill
2006 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 161, no 1, p. 10-21Article in journal (Refereed) Published
Abstract [en]

Wet ultra-fine grinding of a limestone powder ( less than or equal 100 μm) has been investigated in a stirred media mill with respect to the effect of slurry rheology. The grinding results obtained by various parameters (i.e., molecular weight of a dispersant, solids concentration, additive dosage, addition method and beads load) are evaluated in terms of energy efficiency and the fineness of a product. A polymeric dispersant called Dispersant S40 with a molecular weight of 5500 gives the best grinding results. For a certain level of beads load, an optimal solids concentration exists. In the case of the additive dosage of Dispersant S40 at 0.1 wt.% or more, a smaller additive amount of Dispersant S40 gives a higher energy efficiency and a smaller median size at a lower level of specific energy input. However, the excessive amount of the dispersant could cause a cushion layer formed on milling beads and thus lowers stress intensities from the collisions of milling beads, leading to an inefficient milling operation. This can be avoided by either the multi-point addition of the dispersant or a higher beads load ( greater than or equal 83 vol.%). In addition, it was found that the higher the beads load, the better the cumulative energy efficiency, and the smaller the product size at the same specific energy consumption. For a given solids concentration, the relationships between the specific surface area and the particle size of an FP product and the additive amount of Dispersant S40 are explored, respectively. Furthermore, an empirical particle size-energy model provides a good fit (R2 > 0.991) to the grinding results under the experimental conditions investigated.

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-9739 (URN)10.1016/j.powtec.2005.08.026 (DOI)000234880500002 ()2-s2.0-30144442528 (Scopus ID)86772d50-c357-11db-9ea3-000ea68e967b (Local ID)86772d50-c357-11db-9ea3-000ea68e967b (Archive number)86772d50-c357-11db-9ea3-000ea68e967b (OAI)
Note
Validerad; 2006; 20070111 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
He, M., Wang, Y. & Forssberg, E. (2006). Parameter studies on the rheology of limestone slurries (ed.). Paper presented at . International Journal of Mineral Processing, 78(2), 63-77
Open this publication in new window or tab >>Parameter studies on the rheology of limestone slurries
2006 (English)In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 78, no 2, p. 63-77Article in journal (Refereed) Published
Abstract [en]

The influences of solids concentration, molecular weight of dispersant, particle size and distribution, and temperature on the rheological behaviour of limestone slurries have been investigated. The results reveal that when the solids concentration of a limestone slurry (< 100 μm) is increased from 60 wt.% (35.71 vol.%) to 78.5 wt.% (57.49 vol.%), the rheological behaviour of the slurry is transformed from a weakly dilatant characteristic to a pseudoplastic one with a yield stress, which is in combination with a thixotropic property at a higher solids concentration (i.e., ≥ 75 wt.% or 52.63 vol.%). At a certain shear rate, the apparent viscosity and the relative viscosity of the slurry increase exponentially with solids concentration. The extrapolated Bingham yield stress increases rather sharply in a power-law form with increasing solids concentration when the solids concentration of the slurry is larger than 70 wt.% (i.e., 46.36 vol.%)...

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-12060 (URN)10.1016/j.minpro.2005.07.006 (DOI)000234578900001 ()2-s2.0-28844434578 (Scopus ID)b1c2b050-a17a-11db-8975-000ea68e967b (Local ID)b1c2b050-a17a-11db-8975-000ea68e967b (Archive number)b1c2b050-a17a-11db-8975-000ea68e967b (OAI)
Note
Validerad; 2006; 20070111 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
He, M. & Forssberg, E. (2006). Rheological behaviours in stirred media milling of limestone (ed.). In: (Ed.), Güven Önal (Ed.), Proceedings of the XXIII International Mineral Processing Congress: : Istanbul, Turkey 3 - 8 September 2006. Paper presented at International Mineral Processing Congress : 03/09/2006 - 08/09/2006 (pp. 75-80). Istanbul: IMPC
Open this publication in new window or tab >>Rheological behaviours in stirred media milling of limestone
2006 (English)In: Proceedings of the XXIII International Mineral Processing Congress: : Istanbul, Turkey 3 - 8 September 2006 / [ed] Güven Önal, Istanbul: IMPC , 2006, p. 75-80Conference paper, Published paper (Refereed)
Abstract [en]

This paper has investigated the effect of solids concentration and the addition of a dispersant called Dispersant S40 on the flowability of unground and ground limestone slurries. The rheological behaviour of the unground slurries (<100 μm) is transformed through different types of flows with increasing solids concentration. The use of Dispersant S40 can improve the slurry flowability by decreasing viscosity and eliminating Bingham yield stress. The rheological behaviours of ground limestone slurries vary with grinding from a starting dilatant flowability to a resulting pseudoplastic one with an evident Bingham yield stress combining a thixotropic character, whose appearance is correlated to the fineness of a ground product, solids concentration, and the additive amount of Dispersant S40. In addition, the accurate rheological characterization of time-dependent fluids is dependent upon the used instruments and operation conditions.

Place, publisher, year, edition, pages
Istanbul: IMPC, 2006
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-31922 (URN)84886937794 (Scopus ID)63f1fdf0-d621-11db-8550-000ea68e967b (Local ID)63f1fdf0-d621-11db-8550-000ea68e967b (Archive number)63f1fdf0-d621-11db-8550-000ea68e967b (OAI)
Conference
International Mineral Processing Congress : 03/09/2006 - 08/09/2006
Note
Godkänd; 2006; Bibliografisk uppgift: CD-ROM; 20070319 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Yang, Q., Nedar, L., Engström, F. & He, M. (2006). Treatments of AOD slag to produce aggregates for road construction (ed.). In: (Ed.), (Ed.), AISTech 2006: Proceedings of the Iron & Steel Technology Conference and Exposition. Paper presented at Iron & steel technology conference : 01/05/2006 - 04/05/2006 (pp. 573-583). Warrendale, Pa.: Iron and Steel Society, 1
Open this publication in new window or tab >>Treatments of AOD slag to produce aggregates for road construction
2006 (English)In: AISTech 2006: Proceedings of the Iron & Steel Technology Conference and Exposition, Warrendale, Pa.: Iron and Steel Society , 2006, Vol. 1, p. 573-583Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Warrendale, Pa.: Iron and Steel Society, 2006
National Category
Metallurgy and Metallic Materials Metallurgy and Metallic Materials
Research subject
Process Metallurgy; Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-31194 (URN)54d69960-fa1c-11db-b2dd-000ea68e967b (Local ID)54d69960-fa1c-11db-b2dd-000ea68e967b (Archive number)54d69960-fa1c-11db-b2dd-000ea68e967b (OAI)
Conference
Iron & steel technology conference : 01/05/2006 - 04/05/2006
Note
Godkänd; 2006; 20070504 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-28Bibliographically approved
Yang, Q., Engström, F., Tossavainen, M., He, M. & Wang, Z. (2005). AOD slag treatments to recover metal and to prevent slag dusting (ed.). In: (Ed.), (Ed.), 7th Nordic-Japan Symposium on Science and Technology of Process Metallurgy: . Paper presented at Nordic-Japan Symposium on Science and Technology of Process Metallurgy : 15/09/2005 - 16/09/2005 (pp. 14).
Open this publication in new window or tab >>AOD slag treatments to recover metal and to prevent slag dusting
Show others...
2005 (English)In: 7th Nordic-Japan Symposium on Science and Technology of Process Metallurgy, 2005, p. 14-Conference paper, Published paper (Refereed)
National Category
Metallurgy and Metallic Materials Metallurgy and Metallic Materials
Research subject
Mineral Processing; Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-32937 (URN)79896760-1466-11dc-b9f0-000ea68e967b (Local ID)79896760-1466-11dc-b9f0-000ea68e967b (Archive number)79896760-1466-11dc-b9f0-000ea68e967b (OAI)
Conference
Nordic-Japan Symposium on Science and Technology of Process Metallurgy : 15/09/2005 - 16/09/2005
Note
Godkänd; 2005; 20070606 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-28Bibliographically approved
He, M. (2005). Slurry rheology of limestone and its effects on wet ultra-fine grinding (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Slurry rheology of limestone and its effects on wet ultra-fine grinding
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates rheology of limestone slurries and its effects on wet ultra-fine grinding in order to reduce energy cost and increase the throughput and the product fineness. The influences of solids concentration, molecular weight of a dispersant, particle size and distribution, and temperature on the rheological behaviours of limestone slurries have been investigated with rotational and cone-plate viscometers. The results reveal that when the solids concentration of a limestone slurry (< 100 um) is increased from 60 wt.% (35.71 vol.%) to 78.5 wt.% (57.49 vol.%), the rheological behaviour of the slurry is transformed from the weakly dilatant characteristic to the pseudoplastic with a yield stress, which is in combination with the thixotropic at a higher solids concentration (i.e., > 75 wt.% or 52.63 vol.%). At a certain shear rate, the apparent viscosity and the relative viscosity of the slurry increase exponentially with the solids concentration. The extrapolated Bingham yield stress increases in a power- law form with increasing solids concentration when the solids concentration of the slurry is larger than 70 wt.% (i.e., 46.36 vol.%). The maximum packing solids fraction attainable is predicted as 64.6 vol.% at the certain limestone-water suspension system. Besides, the smaller the particle size, the more evident the pseudoplastic property of limestone slurry are with a larger yield stress and a larger apparent viscosity at a given shear rate. Furthermore, the apparent viscosity and the extrapolated Bingham decrease with increasing temperature in a range of 20 to 40 oC. Also, wet ultra-fine grinding of a limestone powder (< 100 um) has been investigated based on the effect of slurry rheology. The grinding results through various parameters (i.e., molecular weight of a dispersant, solids concentration, additive dosage, additive method, feed temperature and bead load) are evaluated in terms of energy efficiency (increment of the specific surface area of a product per unit of specific energy consumption) and the product fineness. Sodium polyacrylate with a molecular weight of 5,500 (i.e., Dispersant S40) appears to be most effective grinding aid, i.e., for the reduction of the apparent viscosity. A sufficient addition dosage significantly decreases or even eliminates the effect of particle size and distribution on the flowability of limestone slurries. However, excessive amount of the dispersant is detrimental to wet ultra-fine grinding of limestone. This is avoided by the multi-point addition of the dispersant or by a higher bead load (> 83 vol.%). For a certain level of bead load, an optimal solids concentration exists for more effective grinding. The influence of feed temperature studied on wet ultra-fine grinding of the limestone is insignificant. Besides, the higher the bead load, the better the cumulative energy efficiency, the higher the milling rate, the larger the specific surface area of the product and the smaller the median size at the same specific energy consumption. In wet ultra-fine grinding of the limestone slurry with a given additive amount of a dispersant (i.e., Dispersant S40), the slurry from an initial feed to a final FP slurry (a discharge slurry where the grinding operation is automatically terminated by a safety control device due to poor slurry flowability) is transformed through different rheological behaviours due to the size reduction with a prolonged grinding time. For a given solids concentration of a limestone slurry (< 100 um), the characteristic sizes and the specific surface area of a final FP product are only related to the additive amount of Dispersant S40. In addition, an empirical particle size-energy model provides a good fit (R2 > 0.991) to the experimental results regardless of whatever grinding conditions.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005. p. 45
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2005:06
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-26117 (URN)cbdd0840-9aff-11db-8975-000ea68e967b (Local ID)cbdd0840-9aff-11db-8975-000ea68e967b (Archive number)cbdd0840-9aff-11db-8975-000ea68e967b (OAI)
Note
Godkänd; 2005; 20070103 (haneit)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-24Bibliographically approved

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