| 11. |
- Kish, L.B., et al.
(författare)
-
In situ electrical transport measurements and self-organization in gold nanoparticle films during and after deposition
- 2001
-
Ingår i: Surface & Coatings Technology. - 0257-8972 .- 1879-3347. ; 142-144, s. 1088-1093
-
Tidskriftsartikel (refereegranskat)abstract
- In the first part of this paper, a new method is shown which is able to predict the particle size of conductive nanoparticle films in situ, during deposition. The method is used for the measurement of the time-derivative of conductance fluctuations during deposition. The second part of the paper deals with in situ conductance measurements on gold films during deposition. During the measurement, various electrical fields have been applied in order to study the possible influence of the field magnitude on the film formation. The observed effects have been interpreted by the biased percolation model. A possible technological application of the observed phenomenon is the fabrication of nanoparticle films with controlled disorder, e.g. in chemical sensors. © 2001 Elsevier Science B.V. All rights reserved.
|
|
| 12. |
|
|
| 13. |
- Persson, P., et al.
(författare)
-
Self-propagating high-temperature synthesis and liquid-phase sintering of TiC/Fe composites
- 2002
-
Ingår i: Journal of Materials Processing Technology. - 0924-0136 .- 1873-4774. ; 127:2, s. 131-139
-
Tidskriftsartikel (refereegranskat)abstract
- The present paper addresses a possible route for the manufacturing of iron-based metal-matrix composites (MMCs) with a high level of reinforcement. The ceramic reinforcement studied was titanium carbide (TiC). TiC is one of the hardest materials to be found, which is why a TiC/Fe composite has the potential to be used as armour. Two manufacturing routes have been evaluated experimentally, i.e., liquid-phase sintering (LPS) and self-propagating high-temperature synthesis (SHS). LPS was found to be more effective due to easier process control and due to the process yielding a more homogeneous material. Both LPS and SHS produced a material with a relatively high degree of porosity. The porosity in the LPS experiments could be decreased by varying the process parameters, but this was not possible in the SHS process. Metallographic investigation shows that the TiC/Fe system is feasible and that applications utilising TiC/Fe composites are possible in the future. This is due to the fact that despite the porosity, an improvement of the MMC properties is detected, compared to those of the matrix material. © 2002 Elsevier Science B.V. All rights reserved.
|
|
| 14. |
- Savage, G. P., et al.
(författare)
-
Soluble and insoluble oxalate content of mushrooms
- 2002
-
Ingår i: International Journal of Food Sciences and Nutrition. - : Informa Healthcare. - 0963-7486 .- 1465-3478. ; 53:4, s. 293-296
-
Tidskriftsartikel (refereegranskat)abstract
- Six different cultivars of edible fungi were bought from a local supermarket in Uppsala, Sweden and three different cultivars of wild growing fungi were harvested from the forest adjoining the city. The edible portions of the raw fungi were then analysed for total and soluble oxalate content. A portion of each fungi was then cooked by first boiling in a small amount of water followed by frying in a small amount of butter. The total oxalate content of the raw, commercially grown mushrooms ranged from 58.9 to 104.1 mg/100 g DM while the values for the total oxalate content of the cooked mushrooms ranged from 48.9 to 124.6 mg/100 g DM. Apart from cultivars ostronskivling and piopino the cultivated mushrooms contained mostly insoluble oxalates. Mushrooms harvested from the forest contained only soluble oxalate with the levels ranging from 29.3 to 40.2 mg/100 g DM in the raw tissue. Cooking marginally lowered the soluble oxalate content of these mushrooms. The levels of soluble and insoluble oxalates of all the mushrooms analysed were low compared to other common oxalate-containing vegetables.
|
|
| 15. |
- Savage, S, et al.
(författare)
-
SiC based gas sensors and their applications
- 2000
-
Ingår i: Materials Science Forum. - 0255-5476 .- 1662-9752. ; 353-3, s. 747-752
-
Tidskriftsartikel (refereegranskat)abstract
- The development and field-testing of hardy high-temperature sensors based on silicon carbide devices has to date shown promising results in several application areas. As the need to take care of the environment becomes more urgent, these small and relatively cheap sensors could be used to increase the monitoring of gases, or to replace or complement larger and more expensive sensor technologies used today. In this paper the development of Silicon Carbide MOSFET transistor sensors and Schottky diode sensors is described. The devices are tested in industrial applications such as monitoring of car exhausts and flue gases.
|
|
| 16. |
- Skoglund, P, et al.
(författare)
-
Constitutive modelling and mechanical properties of a nitrogen alloyed steel
- 2000
-
Ingår i: Journal de Physique IV. - 1155-4339 .- 1764-7177. ; 10:P9, s. 701-706
-
Tidskriftsartikel (refereegranskat)abstract
- The mechanical behaviour of a nitrogen alloyed steel has been investigated. Tensile tests have been done at nominal strain rates from 10(-3) to 800 s(-1). The results are discussed in terms of material modelling and constitutive parameters for the Johnson and Cook model are proposed. At large strain rates the effect of adiabatic heating complicates the evaluation of the model constants. It is shown that significant errors in the predicted flow stress may occur if parameters determined under adiabatic conditions are used for isothermal deformation modes, or vice versa. The effect of temperature increase during the uniform part of the deformation is further discussed, and a simple finite element model for calculation of the temperature evolution with strain and strain rate is presented. The results are incorporated in the Johnson and Cook model, thus improving the agreement between model prediction and experimental data.
|
|
| 17. |
|
|
