| 1. |
|
|
| 2. |
- Loberg, John, et al.
(författare)
-
Neutron Detection-Based Void Monitoring in Boiling Water Reactors
- 2010
-
Ingår i: Nuclear science and engineering. - 0029-5639 .- 1943-748X. ; 164:1, s. 69-79
-
Tidskriftsartikel (refereegranskat)abstract
- The ratio between the thermal- and fast-neutron fluxes in a boiling water reactor depends on the void fraction. The density of the steam-water mixture present in the core determines the efficiency of the moderation of fast neutrons born in fission; therefore, the void fraction could be determined by means of a simultaneous measurement of the thermal- and fast-neutron fluxes. Such measurement could also be used to investigate channel bow of the nuclear fuel bundles surrounding the detector because of sensitivity of the thermal flux to geometry changes. Calculations have been performed with both lattice and nodal codes to study the behavior of the void fraction correlation to the ratio of the thermal- and fast-neutron fluxes. The results prove the correlation to be nearly linear and robust. The rate of change of the correlation is insensitive to standard reactor operating parameters such as control rods and burnable absorbers; the sensitivity of the ratio to void fraction changes primarily depends on the geometry of the fuel bundles. A linear prediction model was used to represent the nodal code results. The absolute void fraction at over 792 positions in the core could be predicted with an absolute uncertainty of +/- 1.5%.
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
|
|
| 6. |
- Tuomas, Göran
(författare)
-
Effective use of water in a system for water driven hammer drilling
- 2004
-
Ingår i: Tunnelling and Underground Space Technology. - : Elsevier BV. - 0886-7798 .- 1878-4364. ; 19:1, s. 69-78
-
Tidskriftsartikel (refereegranskat)abstract
- Drilling with water driven down-the-hole (DTH) hammers is a recently developed method for competitive production of boreholes. In order to prevent large amounts of water being used during operation, the drilling fluid is here directly processed into a quality acceptable for reuse. The effectiveness is evaluated in well drilling with a mobile prototype water cleaning and pressurising unit. Especially the presence of abrasive particles in the fluid can drastically reduce tool life and make the method inefficient. The vital significance of this relation has called for detailed studies and a process simulation model for determining particle concentration and size distribution has been developed. This paper describes the model and how it is applied. Simulation results of different system configurations are also presented
|
|
| 7. |
- Lawa, F., et al.
(författare)
-
Tectono-stratigraphic evolution of the NW segment of the Zagros fold-thrust belt, Kurdistan, NE Iraq
- 2013
-
Ingår i: Journal of Petroleum Geology. - : Wiley. - 0141-6421 .- 1747-5457. ; 36:1, s. 75-96
-
Tidskriftsartikel (refereegranskat)abstract
- The Kurdistan (NW) segment of the Zagros fold-thrust belt, located in the Kurdistan Region of NE Iraq, forms the external part of the Zagros orogen and is bounded by the Zagros suture to the NE. To the SW is the Arabian Plate into which the deformation front has migrated progressively, beginning in the Late Cretaceous and culminating in the Tertiary. Regional compression resulted in obduction of the Mawat ophiolites and emplacement of the Avroman and Qulqula nappes onto the continental margin, and the formation of the Kurdistan foreland basin. In this paper, structural, stratigraphic and palaeontological data together with new field observations are used to investigate the tectono-stratigraphic evolution of this basin, and to study the propagation of the deformation front from the Zagros Imbricate Zone in the NE towards the Mesopotamian foredeep in the SW. Six unconformities within the Kurdistan foreland basin succession are recognized: Turonian (base-AP9; 92 Ma); Danian (base-AP10; 65 Ma); Paleocene–Eocene (intra-AP10; 55 Ma); late Eocene (top-AP10; 34 Ma); middle-upper Miocene (a local unconformity; intra-AP11; 12 Ma); and Pleistocene. These unconformities can be divided into two groups; obduction-related (Turonian, Danian, and Paleocene-Eocene); and collision-related (late Eocene, middle-upper Miocene, and Pleistocene).The geographical position of the unconformities is used to determine the rate of propagation of the deformation front, which is estimated at ca. 3 mm/yr. This is in agreement with previous studies which suggested a NW-ward decrease in the propagation rate. The rate was most rapid (2.95 mm/yr) in the Low Zagros Fold-Thrust Zone and slower (2.06 mm/yr) in the High Zagros Fold-Thrust Zone. The more rapid propagation rate in the former area may be attributed to the presence there of the Miocene Lower Fars Formation which acted as a shallow décollement surface.Within the Zagros fold-thrust belt, the intensity of deformation decreases towards the foreland (SW). Deformation in the High Zagros Fold-Thrust Zone is characterized by thrust imbricates and high amplitude fault-propagation folds at the surface separated by narrow synclines. However, the Low Zagros Fold-Thrust Zone (Simply Folded Belt) is characterised by detachments and low amplitude fault propagation folds separated by broad synclines. In the foredeep area, folds are confined to the subsurface. Deeply buried Jurassic units, together with Upper Cretaceous – Paleocene siliciclastics, and the evaporite-dominated Lower Fars Formation may have acted as décollement surfaces in the NW segment of the Zagros fold-thrust belt, and controlled the structural geometry and evolution of the area.
|
|
| 8. |
|
|
| 9. |
- Jones, Barry E., et al.
(författare)
-
Nonparametric tests of the necessary and sufficient conditions for separability
- 2007
-
Ingår i: Functional Structure Inference. - 1571-0386. - 9780444530615 - 9781849508131 ; 18, s. 33-56
-
Bokkapitel (refereegranskat)abstract
- We survey the current state of the art in the use of nonparametric methods to test separability. We focus on three tests: Swofford and Whitney's (1994) joint test of the necessary and sufficient conditions for weak separability; Fleissig and Whitney's (2003) sequential test of those conditions; and Jones and Stracca's (2006) test of the necessary and sufficient conditions for additive separability. We illustrate the latter two tests by applying them to data generated from Barnett and Choi's (1989) WS-branch model. The empirical results show that these two tests are able to correctly identify separable structure in nearly all cases.
|
|
| 10. |
- Berndt, Jaqueline, Prof Dr, 1963-
(författare)
-
Introducción
- 2023
-
Ingår i: Estudios de Anime. - Gijón : Satori. - 9788419035479 ; , s. 13-36
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Spanish translation of2021_“Introduction,” in Anime Studies: Media-Specific Approaches to Neon Genesis Evangelion, ed. by José Andrés Santiago Iglesias and Ana Soler Baena, Stockholm UP, pp. 1–18. Open Access. by Jonathan López-Vera con asesoramiento terminológico de David Heredia desde DARUMA Serveis Lingüístics, SL. See also Polish translation of the same chapter, by Anna Justyna Radkiewicz, 2022, doi.org/10.26881/pan.2022.28.07.
|
|
