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- Acke, Filip, 1968, et al.
(författare)
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Influence of the platinum-support interaction on the direct reduction of NOx under lean conditions
- 1998
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Ingår i: Studies in Surface Science and Catalysis. - 0167-2991. ; 116, s. 285-294
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Tidskriftsartikel (refereegranskat)abstract
- Catalysts containing Pt supported on SiC, Al2O3 and ZSM-5 were prepared and studied for NOx reduction by C3H6 in Oz excess under transient (temperature ramps) and steady-state conditions. The maximum NOx reduction activity in the heating ramp experiments was similar for Pt/SiC and Pt/ZSM-5, while Pt/Al2O3 showed higher maximum activity. Both N-2 and N2O formation was observed for all catalysts, although the respective amounts varied with the investigated system. Highest Nz selectivity was observed for Pt/Al2O3. When the NOx reduction activity was studied under steady-state conditions the activity of Pt/Al2O3 decreased substantially (mainly due to a loss in N-2 production). Pt/ZSM-5 became somewhat more selective towards Na production whereas the activity and selectivity of Pt/SiC remained at about the same values as far the heating ramp experiments. Adsorbed species on the surface of the different catalysts were investigated using in-situ FTIR in order to obtain information about the reaction mechanisms. The adsorption of species on Pt/SiC was negligible, while a number of absorption bands were observed for Pt/Al2O3 (N and C containing species, and -NCO) and Pt/ZSM-5 (HC).
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- Badala, A, et al.
(författare)
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Subthreshold production of low momentum K+ in p+C at 1.2 GeV
- 1998
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Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 80:22, s. 4863-4866
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Tidskriftsartikel (refereegranskat)abstract
- The double differential cross section of low momentum kaons (less than or equal to 0.3 GeV/c) from p + C collisions at subthreshold bombarding energies has been for the first time measured by the use of the CLAMSUD magnetic spectrometer installed at the C
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- Elmer, R, et al.
(författare)
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K+ emission in symmetric heavy ion reactions at subthreshold energies
- 1996
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Ingår i: PHYSICAL REVIEW LETTERS. - : AMER INST PHYSICS. ; 77:24, s. 4884-4886
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Tidskriftsartikel (refereegranskat)abstract
- Subthreshold K+ production cross sections have been measured in symmetric Ne + NaF, Ni + Ni, and Au + Au collisions at 1.0A GeV. The mass dependence is strong, close to A(2). The angular distributions are nonisotropic in the center-of-mass system. Introdu
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- Evensen, L, et al.
(författare)
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Thin detectors for the CHICSi Delta E-E telescope
- 1997
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Ingår i: IEEE TRANSACTIONS ON NUCLEAR SCIENCE. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9499. ; 44:3, s. 629-634
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Tidskriftsartikel (refereegranskat)abstract
- A pilot series of 10 mu m to 15 mu m thin silicon detectors has been made for the Delta E-E telescopes in the CHICSi detector system. This system will operate gt the CELSIUS heavy ion storage ring in Uppsala, Sweden, Delta E-E telescopes provide isotope i
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- Thungstrom, G, et al.
(författare)
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Fabrication of an integrated Delta E-E-silicon detector by wafer bonding using cobalt disilicide
- 1997
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Ingår i: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT. - : ELSEVIER SCIENCE BV. - 0168-9002. ; 391:2, s. 315-328
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Tidskriftsartikel (refereegranskat)abstract
- The problem concerning mechanical stability of thin self-supporting Delta E detector in a Delta E-E semiconductor detector telescope, has been solved by integrating both detectors into one unit. We show here a low-cost method to integrate the detectors by
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- Westerberg, Lars, et al.
(författare)
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Hydrogen content and outgassing of air-baked and vacuum-fired stainless steel
- 1997
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Ingår i: VACUUM. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0042-207X. ; 48:7-9, s. 771-773
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The hydrogen content of stainless steel samples, treated by 400 degrees C heat treatment for 2, 4, 8, 16 and 24 h in ambient air, was determined by the H-1(N-15,alpha gamma)C-12 nuclear resonance reaction, and a standard extraction method Two reference sa
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- Westerberg, Lars, et al.
(författare)
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Hydrogen content in UHV flanges cut by high-pressure water-jet technique
- 1996
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Ingår i: VACUUM. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0042-207X. ; 47:6-8, s. 687-688
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Tidskriftsartikel (refereegranskat)abstract
- Hydrogen profiles of ASTM304 and 316 stainless steel samples, cut by high-pressure, 3400 bar, abrasive wafer-jet cutting have been measured by H-1(N-15, alpha gamma)C-12 nuclear resonance technique. In the near-surface region of the water-jet cut samples
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- Österlund, Lars, 1967, et al.
(författare)
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Model studies of NOx storage
- 1999
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Ingår i: 8th European Conference on Applications of Surface and Interface Analysis (ECASIA’99) in Sevilla, Spain, October, 4-8, 1999.
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Konferensbidrag (refereegranskat)
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