| 1. |
- Ali, Sharafat, 1976-, et al.
(författare)
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Compositional effects on the properties of high nitrogen content alkaline-earth silicon oxynitride glasses, AE = Mg, Ca, Sr, Ba
- 2011
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Ingår i: Journal of the European Ceramic Society. - : Elsevier BV. - 0955-2219 .- 1873-619X. ; 31:4, s. 611-618
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Tidskriftsartikel (refereegranskat)abstract
- A series of alkaline-earth element containing high nitrogen content oxynitride glasses (AESiON), with AE = Mg, Ca, Sr, Ba, were prepared in order to investigate the compositional effects on the physical properties of the alkaline-earth element. The physical properties were found to change linearly with the concentration of AE elements. The density of the glasses increases substantially with an increase in the AE atomic mass and slightly with an increase in nitrogen ratio. Ba containing glasses shows the value of density 4.16 g/cm3. Glass transition temperatures are found to be higher for Mg glasses, ca. 1020 °C, in comparison with Ba glasses, ca. 895 °C. The hardness of Mg containing glasses shows high values, up to 12.2 GPa and decreases for Ca, Sr and Ba containing glasses. Ba, containing glasses shows high values of refractive index in comparison with the Sr, Ca and Mg containing glasses.
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| 2. |
- Ali, Sharafat, 1976-, et al.
(författare)
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Preparation of oxynitride glasses from woody biofuel ashes.
- 2010
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Ingår i: Journal of Non-Crystalline Solids. - : Elsevier BV. - 0022-3093 .- 1873-4812. ; 356:50-51, s. 2774-2777
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Tidskriftsartikel (refereegranskat)abstract
- Oxynitride glasses have been prepared by melting woody biofuel ash from a power plant in south Sweden with addition of calcium metal as an extra modifier in a nitrogen atmosphere at 1350–1500 °C. The glasses were characterized by X-ray powder diffraction, differential thermal analysis and scanning electron microscopy. Cation and anion glass compositions were determined by energy dispersive X-ray analysis and combustion analysis, respectively. The glasses were found to be homogenous, translucent gray to black, and to contain up to 23 e/o of calcium and 5 e/o of nitrogen. The glass formation depends on the ratio of calcium metal introduction to the ash precursors. A strong exothermic reaction was observed at 650–850 °C, leading to the formation of amorphous and crystalline oxynitride phases that melt at high temperatures upon further heating. The glass densities vary between 2.76 g/cm3 and 2.92 g/cm3. The glass transition temperature was found to vary from 670 °C to 749 °C and increase linearly with the nitrogen content.
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| 3. |
- Alsyouf, Imad
(författare)
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Cost Effective Maintenance for Competitve Advantages
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis describes the role of cost effective maintenance in achieving competitive advantages. It explores by means of a survey which maintenance practices are used, and how maintenance policies are selected in Swedish industries. Also, it suggests a model for selecting the most cost effective maintenance policy, and how to improve the effectiveness of condition based maintenance decision-making. Finally it discusses how to assess the impact of maintenance practices on business strategic objectives. The main results achieved in the thesis are 1) A better understanding of maintenance organisation, management, systems and maintenance status in Swedish industry. For example, it was found that about 70% of Swedish companies still consider maintenance as a cost centre. Preventive and predictive maintenance approaches are also emphasised. 2) Most Swedish firms, i.e. about 81%, use the accumulated knowledge and experience within the company as a method for maintenance selection. Besides, about 31% use a method based on modelling the time to failure and optimisation. About 10% use failure mode effect and criticality analysis (FMECA) and decision trees and only 2% use multiple criterion decision-making (MCDM). However, the most used maintenance selection method is not the one most satisfactory to its users. Furthermore, about 30% use a combination of at least two methods. 3) A practical model for selecting and improving the most cost effective maintenance policy was developed. It is characterised by incorporating all the strengths of the four methods used in industry. 4) A mechanistic model for predicting the value of vibration level was verified both at the lab and in a case study. 5) A model for identifying, assessing, monitoring and improving the economic impact of maintenance was developed and tested in a case study. Thus it was proved that maintenance is no longer a cost centre, but could be a profit-generating function. To achieve competitive advantages, companies should do the right thing, e.g. use the most cost effective maintenance policy, and they should do it right, e.g. ensure that they have the right competence. Furthermore, they should apply the never-ending improvement cycle, i.e. Plan-Do-Check-Act, which requires identifying problem areas by assessing the savings and profits generated by maintenance and monitoring the economic impact of the applied maintenance policy. Thus, they would know where investments should be allocated to eliminate the basic reasons for losses and increase savings. The major conclusion is that proper maintenance would improve the quality, efficiency and effectiveness of production systems, and hence enhances company competitiveness, i.e. productivity and value advantages, and long-term profitability.
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| 4. |
- Anderson, Helén, et al.
(författare)
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Can You Buy a Business Relationship? : On The Importance of Customer and Supplier Relationships in Acquisitions
- 2001
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Ingår i: Industrial Marketing Management. - 0019-8501 .- 1873-2062. ; 30:7, s. 575-586
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Tidskriftsartikel (refereegranskat)abstract
- Mergers and acquisitions have become a popular strategy for gaining growth. Studies show, however, high failure rates for acquisitions. Earlier literature concentrates on the strategic or organizational fit between companies and integration processes and fails to recognize the companies' external business relationships. An implicit assumption seems to be that through acquisition the market position of the target firm can be taken over. We argue that it is not always easy or even possible to take over a company's customer and supplier relationships. We elaborate on the various problems related to relationships that acquisitions may give rise to. Our conceptual discussion is illustrated with a case study from the graphics industry. © 2001 Elsevier Science Inc.
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| 5. |
- Anderson, Helén, et al.
(författare)
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Do Competition Authorities Consider Business Relationships?
- 2012
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Ingår i: Journal of Business-to-Business Marketing. - : Taylor and Francis (Routledge). - 1051-712X .- 1547-0628. ; 19:1, s. 67-92
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: Companies engage in business relationships for a variety of reasons, including specialization, product development, and building competitive networks. Research has demonstrated that mergers and acquisitions (Mandamp;As) may challenge ongoing business relationships. The purpose of this article is to investigate whether and how competition authorities consider business relationships when evaluating Mandamp;As. less thanbrgreater than less thanbrgreater thanMethodology: The article uses the documentation from 450 Mandamp;As reported to the Swedish competition authority to capture the way in which an authority evaluates Mandamp;As. The Swedish competition authority evaluation corresponds to other national and international evaluation procedures. less thanbrgreater than less thanbrgreater thanFindings: The findings indicate that the competition authorities neglect an important aspect of business life, namely companies forming business relationships. The competition authorities evaluate Mandamp;As on the basis of risk for price increases, and consequently disregard such issues as heterogeneity in demand and offerings, and values built into existing business relationships. less thanbrgreater than less thanbrgreater thanOriginality/Value/Contribution: The article contributes to research on business relationships through exploring how a public authority deals with such relationships. It also contributes to research on mergers and acquisitions through examining how these activities are evaluated by competition authorities. Furthermore, the article contributes to competition research by reflecting on competition law concerning Mandamp;A regulations in relation to business relationships.
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| 6. |
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| 7. |
- Benkner, Siegfried, et al.
(författare)
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PEPPHER : Efficient and Productive Usage of Hybrid Computing Systems
- 2011
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Ingår i: IEEE Micro. - : IEEE Institute of Electrical and Electronics. - 0272-1732 .- 1937-4143. ; 31:5, s. 28-41
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Tidskriftsartikel (refereegranskat)abstract
- PEPPHER, a three-year European FP7 project, addresses efficient utilization of hybrid (heterogeneous) computer systems consisting of multicore CPUs with GPU-type accelerators. This article outlines the PEPPHER performance-aware component model, performance prediction means, runtime system, and other aspects of the project. A larger example demonstrates performance portability with the PEPPHER approach across hybrid systems with one to four GPUs.
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| 8. |
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| 9. |
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| 10. |
- Bring, Torun, et al.
(författare)
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Colour development in copper ruby alkali silicate glasses. : Part 2. The effect of tin (II) oxide and antimony (III) oxide
- 2007
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Ingår i: GLASS TECHNOLOGY-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART A. - : Society of Glass Technology. - 1753-3546. ; 48:3, s. 142-148
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Tidskriftsartikel (refereegranskat)abstract
- The effect of Sb3+ and Sn2+ during the heat treatment of copper ruby alkali silicate glasses is investigated. The reducing power of SnO and Sb2O3 with respect to Cu is investigated and it is concluded that SnO has the strongest reducing capability. When Cu2O and SnO concentrations are low, minor additions of Sb2O3 have an observable impact on colour development and absorbance, as thin pieces of glass develop a bluish tint and a larger shift towards longer wavelengths is observed in UV/vis spectra. The differences in colour and spectra are suggested to be caused by differences in size of the colour forming agent, Cu metal particles.
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