| 1. |
- Andersson, Tobias, et al.
(författare)
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Pellet size estimation using spherical fitting
- 2007
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Ingår i: 2007 IEEE Instrumentation and Measurement Technology Conference Proceedings. - Piscataway, NJ : IEEE Communications Society. - 1424405882 ; , s. 1-5
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Konferensbidrag (refereegranskat)abstract
- Evaluation of Spherical Fitting as a technique for sizing iron ore pellets is performed. Size measurement of pellet in industry is usually performed by manual sampling and sieving techniques. Automatic on-line analysis of pellet size would allow non-invasive, frequent and consistent measurement. Previous work has used an assumption that pellets are spherical to estimate pellet sizes. In this research we use a 3D laser camera system in a laboratory environment to capture 3D surface data of pellets and steel balls. Validation of the 3D data against a spherical model has been performed and demonstrates that pellets are not spherical and have physical structures that a spherical model cannot capture.
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| 2. |
- Andersson, Tobias, et al.
(författare)
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Visibility classification of pellets in piles for sizing without overlapped particle error
- 2008
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Ingår i: 9th Biennial Conference of the Australian Pattern Recognition Society on Digital Image Computing Techniques and Applications. - : IEEE Communications Society. - 9781424431618 ; , s. 508-514
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Konferensbidrag (refereegranskat)abstract
- Size measurement of pellets in industry is usually performed by manual sampling and sieving techniques. Automatic on-line analysis of pellet size based on image analysis techniques would allow non-invasive, frequent and consistent measurement. We make a distinction between entirely visible and partially visible pellets. This is a significant distinction as the size of partially visible pellets cannot be correctly estimated with existing size measures and would bias any size estimate. Literature review indicates that other image analysis techniques fail to make this distinction. Statistical classification methods are used to discriminate pellets on the surface of a pile between entirely visible and partially visible pellets. Size estimates of the surface of a pellet pile show that the overlapped particle error is overcome by only estimating the surface size distribution with entirely visible pellets.
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| 3. |
- Aronsson, Thomas, 1963-, et al.
(författare)
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On output of the Swedish education sector : Additional remarks
- 1999
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Ingår i: The Review of Income and Wealth. - : John Wiley & Sons. - 0034-6586 .- 1475-4991. ; 45:4, s. 535-542
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Tidskriftsartikel (refereegranskat)abstract
- The main purpose of this paper is to relate the empirical attempt of measuring output from the education sector to theoretical results about the welfare significance of an extended net national product (NNP) measure. We show that economic theory provides a more focused way of interpreting such output estimates, which has not been recognized in previous studies. The paper also contains new estimates of the output from the Swedish education sector.
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| 4. |
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| 5. |
- Birk, Wolfgang, et al.
(författare)
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Video monitoring of pulverized coal injection in the blast furnace
- 2001
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Ingår i: Conference record of the 2001 IEEE Industry Applications Conference. - Piscataway, NJ : IEEE Communications Society. - 0780371143 ; , s. 1354-1358
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Konferensbidrag (refereegranskat)abstract
- A novel approach for monitoring and control of the coal powder injection in a blast furnace is presented and discussed. Image analysis of video recordings is used as a means to estimate the instantaneous coal flow. Initial experiments at the blast furnace no 3 of SSAB Tunnplat AB Lulea, Sweden, have been performed and first hand results on modelling and control of a single injection line are given.
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| 6. |
- Birk, Wolfgang, et al.
(författare)
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Video monitoring of pulverized coal injection in the blast furnace
- 2002
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Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 38:2, s. 571-576
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Tidskriftsartikel (refereegranskat)abstract
- A novel approach to monitoring and control of the coal powder injection in a blast furnace is presented and discussed. Image analysis of video recordings is used as a means to estimate the instantaneous coal flow. Initial experiments at blast furnace number 3 of SSAB Tunnplat AB, Lulea, Sweden, are reported and firsthand results on modeling and control of a single injection line are given.
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| 7. |
- Broberg, Thomas, et al.
(författare)
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Testing the Porter hypothesis : the effects of environmental investments on efficiency in Swedish industry
- 2013
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Ingår i: Journal of Productivity Analysis. - : Springer. - 0895-562X .- 1573-0441. ; 40:1, s. 43-56
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Tidskriftsartikel (refereegranskat)abstract
- The main objective of this paper is to test the Porter hypothesis by assessing static and dynamic effects of environmental policy on productivity. According to the hypothesis, stringent environmental regulations have dynamic effects on firm performance, and these effects eventually generate profits that offset the adaptation costs. We extend previous analyses by using unique data on environmental protection investments in the Swedish manufacturing industry as a proxy for environmental stringency. These data enable us to separate environmental protection investments into pollution prevention and pollution control. This distinction is crucial since the hypothesis claims that it is investments in prevention that have positive dynamic effects on firm performance. To test the hypothesis, a stochastic production frontier model is estimated where firm inefficiency is a function of investments in environmental protection. In general, we find no support for the Porter hypothesis within the time frame of our study, indicating that environmental regulations lead to efficiency losses. This result is even stronger in the harshly regulated pulp and paper industry.
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| 8. |
- Brännlund, Runar, 1957-, et al.
(författare)
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Assessment of green public procurement as a policy tool : Cost-efficiency and competition considerations
- 2009
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Public procurement is officially regarded as an effective means to secure environmental improvement. Estimates by the European Commission indicate that public authorities within the European Union typically purchase goods and services corresponding to approximately 16 percent of GNP per annum. Hence, it is believed, private firms can be stimulated to invest in sustainable production technologies if the market power of public bodies is exerted through Green Public Procurement (GPP) policies. In this paper we assess whether GPP is a cost-efficient policy tool, and if so whether its implementation can, from a welfare perspective, deter or stimulate entry to procurement markets.
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| 9. |
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| 10. |
- Brännlund, Runar, et al.
(författare)
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Carbon intensity in production and the effects of climate policy – evidence from Swedish industry
- 2014
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Ingår i: Energy Policy. - Oxford : Elsevier. - 0301-4215 .- 1873-6777. ; 67, s. 844-857
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Tidskriftsartikel (refereegranskat)abstract
- We analyze carbon intensity performance at firm level and the effectiveness of the Swedish CO2 tax. Carbon intensity performance is derived from a production technology and measured as changes in the CO2 emission-output production ratio. As one of the first countries to introduce a CO2 tax in 1991, Sweden serves as an appropriate "test bench" for analyzing the effectiveness of climate policy in general. Firm level data from Swedish manufacturing spanning over the period 1990-2004 is used for the analysis. Results show that EP has improved in all the sectors and there is an evidence of decoupling of output production growth and CO2 emissions. Firms' carbon intensity performance responds both to changes in the CO2 tax and fossil fuel price, but is more sensitive to the tax.
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