| 1. |
- Kim, S. K., et al.
(författare)
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Influence of cooling rate on the hot cracking formation of nickel rich alloys
- 2002
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Ingår i: ISIJ International. - : Iron and Steel Institute of Japan. - 0915-1559 .- 1347-5460. ; 42:5, s. 512-519
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Tidskriftsartikel (refereegranskat)abstract
- Hot cracking formation and its mechanism in invar alloys (Fe-36mass%Ni) during continuous casting was investigated. The invar alloy is very sensitive to hot cracking due to its low transition temperature of brittle to ductile fracture even though its solidification interval is narrow. At the cooling rate of 10degreesC/min the transition temperature of brittle to ductile fracture is about 113degreesC below the solidus temperature. An increased cooling rate in invar alloy increases transition temperature of brittle to ductile fracture. It is increased to about 43degreesC below the solidus temperature when the cooling rate is increased to 100degreesC/min. A mechanism of hot cracking formation in invar alloys has been proposed. Hot cracks in invar alloys with a fast cooling rate are formed between the primary dendrites due to the equiaxed solidification structure. However, at slow cooling rate, hot cracks are formed between the grain boundaries due to the columnar structure.
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| 2. |
- Ottosen, Niels Saabye, et al.
(författare)
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Efficient 4-node quadrilateral
- 2004
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Ingår i: Computational Mechanics - Theory and Practice. ; , s. 108-119
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Bjarnadóttir, Thóra K., et al.
(författare)
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The human and mouse repertoire of the adhesion family of G-protein-coupled receptors
- 2004
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Ingår i: Genomics. - : Elsevier BV. - 0888-7543 .- 1089-8646. ; 84:1, s. 23-33
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Tidskriftsartikel (refereegranskat)abstract
- The adhesion G-protein-coupled receptors (GPCRs) (also termed LN-7TM or EGF-7TM receptors) are membrane-bound proteins with long N-termini containing multiple domains. Here, 2 new human adhesion-GPCRs, termed GPR133 and GPR144, have been found by searches done in the human genome databases. Both GPR133 and GPR144 have a GPS domain in their N-termini, while GPR144 also has a pentraxin domain. The phylogenetic analyses of the 2 new human receptors show that they group together without close relationship to the other adhesion-GPCRs. In addition to the human genes, mouse orthologues to those 2 and 15 other mouse orthologues to human were identified (GPR110, GPR111, GPR112, GPR113, GPR114, GPR115, GPR116, GPR123, GPR124, GPR125, GPR126, GPR128, LEC1, LEC2, and LEC3). Currently the total number of human adhesion-GPCRs is 33. The mouse and human sequences show a clear one-to-one relationship, with the exception of EMR2 and EMR3, which do not seem to have orthologues in mouse. EST expression charts for the entire repertoire of adhesion-GPCRs in human and mouse were established. Over 1600 ESTs were found for these receptors, showing widespread distribution in both central and peripheral tissues. The expression patterns are highly variable between different receptors, indicating that they participate in a number of physiological processes.
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| 4. |
- Dhindaw, B. K., et al.
(författare)
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Characterization of the peritectic reaction in medium-alloy steel through microsegregation and heat-of-transformation studies
- 2004
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Ingår i: Metallurgical and Materials Transactions. A. - : Springer Science and Business Media LLC. - 1073-5623 .- 1543-1940. ; 35A:9, s. 2869-2879
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Tidskriftsartikel (refereegranskat)abstract
- In the present work, the phenomenon of the peritectic reaction was characterized in a medium-ailoy steel. Several directional solidification and thermal-analysis experiments were done to investigate the reaction process. Directional solidification experiments carried out did not tend to show any direct evidence of a peritectic reaction. Microsegregation studies on the directionally solidified samples and those solidified under isothermal conditions bring out some interesting features. It has been documented that if the segregation ratio for Ni is higher than that for Cr, there is a correlation that the peritectic reaction had occurred in that region. On the other hand, a higher Cr segregation ratio as compared to Ni showed the possibility that the liquid had directly transformed to gamma-austenite without undergoing a peritectic reaction. Measurement of energies of transformations and the analysis of their values in different segments of the cooling-curve differential thermal analysis (DTA) experiments have helped in understanding the peritectic reaction. It is revealed that the transformation is more like diffusionless transformation, where gamma-austenite directly precipitates from delta-ferrite. Indeed, this proposition is also supported by the segregation patterns for Cr and Ni obtained in the solidified samples of this steel during directional solidification and DTA experiments and also by calculations to show the presence of enough lattice defects or vacancies to aid the aforementioned transformation.
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| 5. |
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| 6. |
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| 7. |
- Fredriksson, A., et al.
(författare)
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Labeling of human C-peptide by conjugation with N-succinimidyl-4- F-18 fluorobenzoate
- 2001
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Ingår i: Journal of labelled compounds & radiopharmaceuticals. - : Wiley. - 0362-4803 .- 1099-1344. ; 44:7, s. 509-519
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Tidskriftsartikel (refereegranskat)abstract
- We have labeled proinsulin connecting peptide (C-peptide) with fluorine-18 (t(1/2) = 109.7min) in order to perform in vivo biodistribution and pharmacokinetic studies with position emission tomography (PET). This study reports the optimization of the conjugation labeling in the N-terminal with N-succinimidyl-4-[F-18]fluorobenzoate ([F-18]SFB). In preparative runs N-4-[F-18]fluorobenzoyl-C-peptide ([F-18]FB-C-peptide) was produced in 8-12% decay-corrected yields, counted from resolubilized [F-18]F-, in less than 5h. The specific radioactivity of [F-18]FB-C-peptide, determined using ELISA for one of the preparations, was around 70 GBq/mu mol at end of synthesis.
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| 8. |
- Fredriksson, Hasse, et al.
(författare)
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On the mechanism of liquid copper penetration into iron grain boundaries
- 2001
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Ingår i: Scandinavian journal of metallurgy. - : Wiley. - 0371-0459 .- 1600-0692. ; 30:1, s. 41-50
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Tidskriftsartikel (refereegranskat)abstract
- The penetration of liquid copper into iron grain boundaries has been experimentally analysed. During the penetration, Cu diffuses into the iron grains. In this case, a Kirkendall effect is created, leading to vacancies which diffuse to the grain boundaries where they condense. A grain boundary crack is formed, which will be filled with liquid Cu. The driving force for penetration of the Cu-liquid into the grain boundary is the condensation of vacancies and the surface/interface free energy change. A theoretical model describing the penetration rate is derived and a good agreement between theory and experiments was achieved. The model is general and can be used to explain liquid metal embrittlement.
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