| 21. |
|
|
| 22. |
- Bengtsson, Lars
(författare)
-
Snöhydrologisk forskning
- 1982
-
Ingår i: Väg- och Vattenbyggaren. - 0042-2177. ; :3, s. 61-64
-
Tidskriftsartikel (populärvet., debatt m.m.)
|
|
| 23. |
- Bengtsson, Lars
(författare)
-
The importance of refreezing on the diurnal snowmelt cycle with application to a Northern Swedish catchment
- 1982
-
Ingår i: Nordic Hydrology. - : IWA Publishing. - 0029-1277 .- 1996-9694. ; 13:1, s. 1-12
-
Tidskriftsartikel (refereegranskat)abstract
- A method for including night-time refreezing of the top layer of a snowpack in the degree-day method for computing daily snowmelt rates is presented. It is found that during days of large diurnal temperature variations the daily melt is more determined by the day-time conditions than by the daily mean conditions. Applications are made to an open area and a forested area. The refreezing-degree-day method is found to describe the snowmelt process very well, whereas the simple degree-day method shows a too fast snowmelt rate.
|
|
| 24. |
|
|
| 25. |
- Berglund, Kris, et al.
(författare)
-
Growth of contact nuclei of citric acid monohydrate
- 1982
-
Ingår i: Nucleation, growth, and impurity effects in crystallization process engineering. - : American Institute of Chemical Engineers. - 0816902267 ; , s. 9-13
-
Konferensbidrag (refereegranskat)
|
|
| 26. |
- Bergman, Bo, et al.
(författare)
-
A graphical method applicable to age-replacement problems
- 1982
-
Ingår i: IEEE Transactions on Reliability. - 0018-9529 .- 1558-1721. ; R-31:5, s. 478-481
-
Tidskriftsartikel (refereegranskat)abstract
- The Total Time on Test (TTT) concept has proven to be a very useful tool in several reliability contexts. The objective of this note is to illustrate how a generalization of the TTT-concept, the TTT-transform, defined as a certain function of the survivor function, can be used when analyzing different types of age-replacement problems. (14 refs.)
|
|
| 27. |
|
|
| 28. |
|
|
| 29. |
- Boström, Kurt, et al.
(författare)
-
Geochemistry and origin of ferromanganese concretions in the Gulf of Bothnia
- 1982
-
Ingår i: Marine Geology. - : Elsevier BV. - 0025-3227 .- 1872-6151. ; 50:1-2, s. 1-24
-
Tidskriftsartikel (refereegranskat)abstract
- Ferromanganese concretions cover large areas of the Gulf of Bothnia. They are flat to well-rounded, the rounded ones being richer in oxyhydroxides of iron and manganese. Rounded and ellipsoidal nodules, particularly those in the northern Gulf of Bothnia, are richest in Mn, Ni, Ba and Cu, which probably coexist in a Mn oxyhydroxide phase. Flat nodules are enriched in Fe, P, rare earths and As, probably associated with an Fe oxy-hydroxide component. Aluminum, V, Cr and Ti occur in still another phase. The sediments of the gulf generally consist of a 10-50 mm-thick layer of oxidized surface sediment, enriched in Mn, Ba, P and Ni lying on top of reduced sediments which are diagenetically depleted in these elements. The remobilized elements have redeposited in the nodules, but this process cannot explain the origin of all the nodular material. Some released Mn, Ba and Ni furthermore enter into suspended phases, which eventually leave the Baltic Sea. The economic value of the nodules in the Gulf of Bothnia is probably limited at present.
|
|
| 30. |
- Boström, Kurt
(författare)
-
On the formation of magnetite-hematite-apatite "magmas" from metalliferous sediments at subduction zones
- 1982
-
Ingår i: Stockholm Contributions in Geology. - 0585-3532. ; :37, s. 21-42
-
Tidskriftsartikel (refereegranskat)abstract
- One interpretation of the plate tectonic theory suggests that marine sediments are brought down to large depths in the Earth and become intensely metamorphosed at subduction zones. A considerable fraction of these subducted sediments would consist of Fe, Mn and P rich exhalative-sedimentary deposits that have formed at spreading centers. A thermodynamic model for such alteration processes shows that exhalative sedimentary deposits would serve as source beds for magmatic magnetite-hematite-apatite rich ores whereas Mn would be lost due to reduction by organic matter, and subsequent removal in acid solutions, formed from interactions between clays and NaCl in pore waters. The alteration products show several similarities with the many magnetite-hematite-apatite ores which are located in the circumpacific orogenic belt
|
|
